Institut Sains & Teknologi Akprind Yogyakarta

Universitas Negeri Semarang

Universitas Lampung

Universitas Malahayati

Universitas Batanghari

Universitas Abulyatama

https://www.teahub.io/viewwp/iixRbib_illustration-of-green-and-red-floral-art-cdr/

Developing Research to Create Prime Resources in the Industrial Revolution Era 4.0

The 2 International Conference on Engineering Science and Technology (ICEST 2021)

nd

BOOK PROGRAMME

Yogyakarta-Indonesia, September 15-16, 2021

Developing Research to Create Prime Resources in the

Industrial Revolution Era 4.0

The 2nd International Conference on Engineering Science and Technology

(ICEST) 2021

BOOK PROGRAMME

September 15 & 16 - IST AKPRIND Yogyakarta, Indonesia

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Preface

Distinguished Guests and Participants,

Ladies and Gentlemen, Brothers and Sisters, and Colleagues from Universities

Assalamu’alaikum Warahmatullahi Wabarakatuh

It gives me pleasure to welcome you to The 2nd International Conference on Engineering Science and Technology virtually, where academicians, professionals, and governments in the engineering fields present the latest research finding and describe science and technology in related areas.

ICEST is organized by a consortium of seven universities, namely Malahayati University (Lampung), Batanghari University (Jambi), IST AKPRIND (Yogyakarta), UNNES (Semarang), Lampung University (Lampung), Abulyatama University (Aceh) and Universiti Malaysia Pahang (Malaysia). Today, IST AKPRIND will host ICEST 2021 virtually.

This conference will focus on the theme of “Developing Research to Create Prime Resources in the Industrial Revolution Era 4.0” and is dedicated to bringing together researchers and practitioners from all over the world. The multidisciplinary theme of the conference provides an excellent forum for engineers, scientists, specifiers, researchers, academics, practitioners, and professionals to connect and share knowledge and learn about collaboration in research to create prime resources in the industrial revolution era 4.0.

Ladies and Gentlemen,

Conferences such as this provide a valuable opportunity for research scientists, industry specialists, and decision-makers to share experiences. This conference was attended by 39 (thirty-nine) presenters from Indonesia, Taiwan, Timor Leste, and of course, Malaysia, also attended by more than 100 participants. Thank you for joining us today.

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I am grateful to many experts who have joined to share their knowledge this day. I also welcome the many representatives of governments, industry associations, and organizations who have joined us.

I am sure you will have fruitful and rewarding exchanges today. I wish you every success with this important conference, and I look forward to learning about the outcome.

Thank you.

Wassalamu’alaikum warahmatullahi wabarakatuh

Dr. Ellyawan S Arbintarso

General Chair

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Rector Speech

Your Excellency,

Professor Ron Harris, Brigham Young University, USA

Professor Rizalman Mamat, Univeristi Malaysia Pahang, Malaysia

Professor Chuen-Jinn Tsai, National Yang Ming Chiao-Tung University, Taiwan

Professor Andika Widya Pramono, Indonesian’s Institute of Science, Indonesia

Honourable Guests,

Ladies and Gentlemen,

Bapak-ibu

Assalamu’alaikum Warahmatullahi Wabarakatuh

Good morning Selamat Pagi and Sugeng Enjang

On behalf of the Institut Sains & Teknologi AKPRIND, I am delighted to join this Virtual Conference, despite the challenge posed by the Covid 19 pandemic. I wish to convey my sincere appreciation to ICEST 2021 committee for making this event happen today. I would also like to thank all the distinguished panelists and moderators for taking the time to participate in today's conference from near and far.

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This year's conference focused on Developing Research to Create Prime Resources in the Industrial Revolution Era 4.0 will address subjects in the physical sciences, including physics, math, chemistry, material science, and engineering.

Globalization of education and the 4.0 Industrial Revolution presence are inevitable and must be faced by higher education institutions. This event challenges us to deal with global change and heightened competition in many aspects, including disruptive phenomena in the higher education model.

Research activities are focused on developing knowledge and research that can make a direct contribution to society. Scientific research will produce results published in international/national journals and can be disseminated in international discussion forums. From the other side, the research results are also expected to assist in determining government/regulator policies and improve sound educating practices.

Ladies and Gentlemen,

The digitalization of society creates new professions and new competency areas for established professions, which increases demands on educational development to manage these. At the same time that the academic environment is being digitalized and offers new opportunities, new digital tools also place new demands on educational development. The new generation of students entering higher education has a different approach to digital solutions and likely also another expectation that educational environments have a high degree of digital sophistication.

These are questions that require activity and development and where educational development helps manage the pressures for change from digitalization, lifelong learning, distance education, and other factors. Academic growth is often dealt with concerning other issues, and I am sure that each higher education institution has its way of dealing with these.

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Research universities are core components of any country's economic, political and social development systems. If knowledge for augmenting productive power is necessary, research is the fundamental process, and its institutionalization will produce researchers and further research.

I note that a workshop preceded this conference to train and mentor young researchers in ICEST. The workshop is really commendable, and I want to encourage the consortium ICEST to continue with this annual conference. I hope that this series of annual conferences will help create a solid continental network of researchers that will begin to have a life of its own.

I wish you an engaging and successful conference. Let's get started, and thank you again for joining us. Terima kasih.

Wassalamu’alaikum warahmatullahi wabarakatuh

Dr. Edhy Sutanta

Rector

Institut Sains & Teknologi AKPRIND Yogyakarta

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Committee Advisor

Prof. Dr. Rizalman Mamat (UMP, Malaysia) Prof. Dr. Ir. Sudarsono, MT (IST AKPRIND, Indonesia) Assoc. Prof. Dr. Edhy Sutanta, MKom (IST AKPRIND, Indonesia) Assoc. Prof. Dr. Ir. Amir Hamzah, MT (IST AKPRIND, Indonesia) Assoc. Prof. Dr. Ir. Toto Rusianto, MT (IST AKPRIND, Indonesia) Ir. R. Agung Efriyo Hadi, M.Sc., Ph.D (UNAYA, Indonesia)

General Chair Assoc. Prof. Dr. Ellyawan Setyo Arbintarso (IST AKPRIND, Indonesia)

Vice General Chair Dr. Muchlis (IST AKPRIND, Indonesia)

Ir. Yan Juansyah, DEA (UNMALA, Indonesia)

Treasure & Finance Ir. Murni Yuniwati, M.T. (IST AKPRIND, Indonesia)

Secretariat M Andang Novianta, S.T., M.T. (IST AKPRIND, Indonesia)

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Publication Assoc. Prof. Dr. Mohd Shahrir bin Mohd Sani (UMP, Malaysia)

Dr. Suwanto Raharjo, S.Si, M.Kom. (IST AKPRIND, Indonesia)

Assoc. Prof. Dr. Anak Agung Putu Susastriawan (IST AKPRIND, Indonesia)

Assoc. Prof. Dr. Sri Mulyaningsih (IST AKPRIND, Indonesia)

Assoc. Prof. Dr. Emy Setyaningsih (IST AKPRIND, Indonesia)

Dr. Januar Parlaungan Siregar (UMP, Malaysia)

Dr. Samuel Kristiyana, M.T. (IST AKPRIND, Indonesia)

Promotion Catur Iswahyudi, S.Kom., S.E, M.Cs. (IST AKPRIND, Indonesia)

Dr. Eng. Rina Febriana, S.T., M.T. (UNMALA, Indonesia)

Assoc. Prof. Dr. Ir. Fakhrul Rozi Yamali, ME (UNBARI, Indonesia)

Assoc. Prof. Dr. Lusmeilia Afriani, DEA (UNILA, Indonesia)

Sita Nurmasitah, M.Hum (UNNES, Indonesia)

Cut Rahmawati, M.T. (UNAYA, Indonesia)

Website Erma Susanti, S.Kom., M.Cs. (IST AKPRIND, Indonesia)

Ruzan Fikra, S.Kom., MBA. (IST AKPRIND, Indonesia)

Event Erna Kumalasari Nurnawati, S.T., M.T. (IST AKPRIND, Indonesia)

Eska Almuntaha, S.E., M.Sc., Ak.CA. (IST AKPRIND, Indonesia)

Beny Firman, S.T., M.Eng. (IST AKPRIND, Indonesia)

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Sponsorship

Ir. Muhammad Yusuf, M.T. (IST AKPRIND, Indonesia)

Dewi Wahyuningtyas, S.T., M.Sc (IST AKPRIND, Indonesia)

Argaditia Mawadati, S.T., M.Sc (IST AKPRIND, Indonesia)

International Programme Committee Agustinus Purna Irawan (Universitas Tarumanagara, Jakarta, Indonesia) Andika Widya Pramono (Indonesian’s Institute of Sciences, Jakarta, Indonesia) Arbi Haza Nasution (Universitas Islam Riau, Pekanbaru, Indonesia) Benny Hidayat (Universitas Andalas, Padang, Indonesia) Cahyo Mustiko Okta Muvianto (Universitas Maratam, Mataram, Indonesia) Cahyorini Kusumawardani (Universitas Negeri Yogyakarta, Yogyakarta, Indonesia) Chuen-Jinn Tsai (National Yang Ming Chiao Tung University, Taipe, Taiwan) Cut Rahmawati (Universitas Abulyatama, Banda Aceh, Indonesia) Denny Vitasari (Universitas Muhammadiyah Surakarta, Surakarta, Indonesia) Dewi Fitria (Universitas Riau, Pekanbaru, Indonesia) Eko Setiawan (Universitas Muhammadiyah Surakarta, Surakarta, Indonesia) Evizal Abdul Kadir (Universitas Islam Riau, Pekanbaru, Indonesia) Ezri Hayat (Teesside University, Middlesbrough, UK) Hari Agung Yuniarto (Universitas Gadjah Mada, Yogyakarta, Indonesia) Ihwan Ghazali (Univeristi Teknikal Malaysia Melaka, Melaka, Malaysia) Januar P Siregar (Universiti Malaysia Pahang, Pekan, Malaysia) Mohammad Sapari Dwi Hadian (Universitas Padjajaran, Bandung, Indonesia) Mohd Shahrir Mohd Sani (Universiti Malaysia Pahang, Pekan, Malaysia)

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Muhammad Norhisham Abdul Rani (Universiti Teknologi Mara, Shah Alam, Malaysia) Nurgiyatna (Universitas Muhammadiyah Surakarta, Surakarta, Indonesia) Nuryono (Universitas Gadjah Mada, Yogyakarta, Indonesia) Purwanto (Universitas Diponegoro, Semarang, Indonesia) Rizalman Mamat (Universiti Malaysia Pahang, Pekan, Malaysia) Ron Harris (Birgham Young University, Provo, USA) Taufika Ophiyandri (Universitas Andalas, Padang, Indonesia) Tri Widodo Besar Riyadi (Universitas Muhammadiyah Surakarta, Surakarta, Indonesia) Yuli Panca Asmara (INTI International University, Nilai, Malaysia) Zahrul Mufrodi (Universitas Ahmad Dahlan, Yogyakarta, Indonesia) Zufialdi Zakaria (Universitas Padjajaran, Bandung, Indonesia)

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Keynote Material

Nu Keynote Speaker Title

1. Prof. Dr. Ron A Harris

Coastal Boulder Fields and Tsunami Hazards of Southern Java, Indonesia*

2. Prof. Dr. Rizalman Mamat

Renewable Fuel for Future Transportation Engines

3. Prof. Dr. Andika Widya Pramono

Some Updates In Materials Science And Engineering To Create Prime Resources In The Industrial Revolution Era 4.0

4. Prof. Dr. Chuen-Jinn Tsai

Micro-Pollution Control

*TBM

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Zoom Access 2nd ICEST 2021

Zoom id for 2nd ICEST 2021 Pleno Session:

Meeting id : 922 6953 6333

Passcode: 2ndiceeest

Parallel session will use breakout room. The presenter can enter the breakout room

according to the specified room. Please check the author code and your room in the list

provided in this Book Programme. Participants can choose the room according to your

interest.

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Presenters Guidelines

✓ Please Rename your profile name by your Author Code_your name. Ex: R1_004 Ajeng Lestari.

✓ Sessions will be opened by the host 10 minutes prior to the starting time, to allow every participant to join

on time. No sessions will start before the host opens the session. All presenters are expected to join the

zoom meeting conference 10 minutes before the event starts.

✓ The presenters prepares a presentation script in PPT format a maximum of 15 pages. You are allocated

a presentation for 10 minutes. If you are presenting live, you will “Share” your screen or

document.Otherwise, the room PIC can set this up on your behalf. Please ensure that your webcam is on

so that attendees can view you during your presentation. Discussion sessions will be held per two

presenters for 10 minutes. Please prepare your presentation documents, so that the presentation session

runs smoothly.

✓ Please follow the rules given by the moderator during the meeting.

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Participants Guidlines

✓ Please Rename your profile name by P_your name. Ex: P_Vera Nurul.

✓ All participants will enter the session in Mute mode (to avoid interruptions of presentations that may be

occurring). The hosts will enable the sound as soon as it is fit. The hosts will be monitoring the sessions,

so if you have any technical question during the session, you can send chat messages to them, so they

can assist you.

✓ This event consist two session, name Pleno Session (plenary) and parallel session. Parallel session

contain research presentation based on field are. You can choose the room according to your interest.

✓ Each session will have a chair that will manage times and moderate questions and answers.

✓ Please raise your hand if you want to pose a question to the presenter (if you prefer, you can pose a

question by sending a chat message directly to the presenter).

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Conference Programs

Date : 15th September 2021

Time (GMT+7) Activities

Official

07.30 - 08.30 Preparation and Attendance Registration Authors and Participants entering to Virtual Conference 2nd ICEST 2021

Committee

08.30 - 08.45 Opening Session Master of Ceremony

08.45 - 09.00 Chairman Committee Greeting Chairman Committe

09.00 - 09.15 Rector of Institut Sains & Teknologi AKPRIND Greeting

Rector

09.15 – 09.45 Keynote Speech 1: Prof. Dr. Ron A Harris Neotectonics Department of Geological Sciences, Brigham Young University, USA.

Moderator: Dr. Mohd Shahrir Mohd Sani PIC: Erna Kumalasari Nurnawati

09.50 – 10.20 Keynote Speech 2: Prof. Dr. Rizalman Mamat Mechanical and Manufacture Engineering College, Universiti Malaysia Pahang, Malaysia.

10.20 – 10.50 Discussion session 1

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11.00 – 11.30 Keynote Speech 3: Prof. Dr. Andika Widya Pramono Superconductor Materials Lembaga Ilmu Pengetahuan Indonesia, Indonesia.

Moderator: Rahayu Khasanah, S.T., M.Eng PIC: Erna Kumalasari Nurnawati

11.30 – 12.00 Keynote Speech 4: Prof. Dr. Chuen-Jinn Tsai Micro-pollution Control Institute of Environmental Engineering, National Yang Ming Chiao Tung University, Taiwan.

12.00 – 12.30 Discussion session 2

12.30 - 13.00 Preparation for Parallel Session Committee

13.00 – 16.00 Parallel Session Committee

16.00 – 16.15 Closing Ceremony MC

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Breaking Room 1 PIC : Bayu Hendra Permana, S.E

Moderator : Dewi Wahyuningtyas, S.T., M.Eng

Author Code

Authors Title

R1_004 Ajeng Lestari, Zainus Salimin, Sukirman Sukirman, Anjanetta Pasha, Miqdam Humami, Muhammad Putra and Ikrom Amar

Pb (II) and Cu (II) Adsorption Performance Using Magnetic Modified Watermelon Rind as a Low Cost Adsorbent

R1_013 Muhammad Ansori, Wahyuningsih Wahyuningsih, Siti Fathonah, Rosidah Rosidah and Nur Aini Halimah Yulianti

Characteristics of Parijoto Fruit as a Preservative Of Dodol Food

R1_021 Octavianti Paramita and Fitriyani Irfanti

Nutritional Characteristics Of Sagon Cake With Breadnut Seed (Artocarpus Communis G.Forst) Flour By Variations Of Flouring Process

R1_022 Atika Atika, Endah Rinasti, Wulansari Prasetyaningtyas, Musdalifah and Siti Nurrohmah

Utilization of Lorotis Weed (Aeschynomene Indica) as Natural Textile Dyes: Soil Pollution Prevention in the Use of Pesticides

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R1_023 Wulansari Prasetyaningtyas and Fenny Fitria Kartika

Colorfastness of Batik Dyed with Dyes from Banana Hump

R1_028 Roudlotus Sholikhah, Widowati Widowati and Sita Nurmasitah

The Impact Of The Use Of Different Mordan Types On The Ecoprint Dyeing Using Secang Dye On Primisima Fabric

Breaking Room 2 PIC : Eska Almuntaha, S.E., M.Sc.,Ak.CA.

Moderator : Dr. Benny Hidayat

Author Code

Authors Title

R2_016 Rina Febrina, Lusmeilia Afriani and Mira Wisman

Integration of Geospatial Technology with Evacuation Pathway Planning for Tsunami Mitigation

R2_001 T Listyani Ra

Groundwater Aggressiveness in Jonggrangan Karst, West Progo Area

R2_007 Mesias Citra Dewi Geomorphological Quantitative Analysis for Interpretation of Geological Structures as the Basis for Decision Making on Coal Exploration Activities in East Kutai Regency, East Borneo Province

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R2_031 Elvira Handayani, Kiki Rizky Amalia, Fakhrul Rozi Yamali, Anisa Ramadona

Analysis Of The Causes Of The Difference In Financing Prices On Road Improvement In Tanjung Jabung Timur Regency

R2_032 Kiki Rizky Amalia, Elvira Handayani, Annisaa Dwiretnani, Rudi Harianto

Pricing Strategy For Project Tender By Contractor

R2_033 Amsori Muhammad Das, Ari Setiawan, Wari Dony

Assessment of How Satisfaction with Service Quality and Service Value Affect Passenger’s Loyalty to the MRT-SBK Service In Greater Kuala Lumpur

R2_34 Ari Setiawan, Azwarman Azwarman, Rioni Rizki Aldiansyah, Riki Saputra

Analysis of The Degree of Saturation Due to Influence Vehicle Speed in Office Area in New Normal Condition (Case Study: Jalan H. Agus Salim Jambi City)

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Breaking Room 3 PIC : Ruzan Fikra, S.Kom.,M.BA

Moderator : Dr. Suwanto Raharjo,S.Si,M.Kom

Author Code

Authors Title

R3_015 Budhi Anto, Amir Hamzah, Dahliyusmanto, Yonni Safadro and Fadly Arif

Sliding Gate Opener System with Smartphone Control Using Bluetooth Connection

R3_025 Samuel Kristiyana and Gatot Santosa

Design Of Heart Rate Monitoring System Using Mobile Telecardiac And Showing The Patient’s Position

R3_037 Venny Yusiana, Hendi Matalata, Safriyudin Safriyudin and Amrih Apike

Gate Driver Design with Phase Shift SPWM technique on H-Bridge Multilevel Inverter topology

R3_038 Fadli Eka Yandra, Venny Yusiana and Amrih Apike

Use of the OriginPro Application for Lightning Wave Spectrum Analysis

R3_012 Noeryanti Noeryanti, Noviana Pratiwi, Sinum Fariasi and Erna Kumalasari Nurnawati

Comparison of Fuzzy Mamdani and Backpropagation Methods to predict Yogyakarta Human Development Index

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R3_018 Erna Kumalasari Nurnawati, Juniana Husna,Yusra Yusra and Ismail Setiawan

Implementation of Analytical Hierarchy Process Method with Eigenvectors Efficiency for Culinary Object Selection in Aceh

R3_024 Uning Lestari, Catur Iswahyudi and Beny Firman

Internet of Things on Smart Parking Systems Based on Vehicle Loop Detector

R3_003 Muhammad Mukhlisin, Azizah Wismaningsih, Hany Windri Astuti, Amin Suharjono and Sri Anggraini Kadiran

Ground Water Flow Monitoring Systems Using Permeability Tank Experiment

Breaking Room 4 PIC : Ir. Muhammad Yusuf, M.T.

Moderator : Angge Dhevi Warisaura, S.T. M.Eng

Author Code

Authors Title

R4_011 Muchlis Muchlis, Sri Hastutiningrum and William Sutrisna

Optimization Waste Disposal Route Using GIS in Yogyakarta Municipality

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R4_020 Rani Ergantara, Dewi Fadilasari and Marcelly Wardana

Analysis Of Green Open Space Adequacy Malahayati University Area In Absorbing Carbon Dioxide Emissions

R4_027 Rani Ergantara, Destrangga Maulana, Dewi Fadilasari and Marcelly Wardana

The Study Of Carbon Dioxide Emissions From Motor Vehicles At Malahayati University

R4_035 Anggrika Riyanti, Hadrah Hadrah, Agung Gusti Khairi Azwar

Investigation of Carbon Footprint from School Activities: A Case Study in Jambi, Indonesia

R4_036 Monik Kasman, Peppy Herawati, Lucya Handayani

Adsorption of Hg(II) from Aqueous Solution by Water Treatment Plant Sludge

R4_041 Sepridawati Siregar, Edo Riyandani and Nora Idiawati

Association of Particulate Matter Exposure and Lung Cancer Mortality in the Workers. A Systematic Review and Meta-Analysis.

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Breaking Room 5 PIC : Argaditia Mawadati, S.T., M.Sc

Moderator : Dr. Anak Agung Putu Susastriawan, S.T., M.Tech

Author Code

Authors Title

R5_002 Fungky Dyan Pertiwi, Arif Wahjudi, Wawan Aries Widodo and Setyo Hariyadi SP

The Effect of Slat Clearance and Flap on the Aerodynamic Performance of the NACA 43018 Wing in the Landing Process

R5_009 Hendrix Noviayanto Firmansayah and Samsudin Anis

Preliminary Design of Composite Safety Shoes Toe Cap Using Finite Element Method

R5_019 Adhi Kusumastuti, Samsudin Anis and Nur Qudus

Fluid Flow Visualization and Parameter Evaluation of Vegetable Oil/ Water Mixture in Taylor-Couette Column

R5_008 Agus Hindarto Wibowo, Windyaning Ustyannie, Argaditia Mawadati and Syauqi Rahman Wibowo

Quality Level Measurement Analysis Using Six Sigma DMAIC Method

R5_014 Argaditia Mawadati, Andrean Emaputra and Kartinasari Ayuhikmatin Sekarjati

Sales Pattern Identification for Marketing Strategies Using Data Mining

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R5_026 Marcelly Wardana, Ahmad Sidiq and Nanda Ari Setiawan

Working Posture Analysis On Press Tile Using Rapid Upper Limb Assessment

Breaking Room 6 PIC : Erma Susanti,S.Kom., M.Cs

Moderator : Ir. Saiful Huda, M.T., M.E.

Author Code

Authors Title

R6_029 Ria Zulfiati, Fakhrul Rozi Yamali Mechanical Properties of Geopolymer Mortar Based on Fly Ash with Polypropylene Fiber

R6_030 Wari Doni, Ria Zulfiati, Amsori Muhammad Das

Compressive Strength Geopolymer Mortar with Fine Aggregate Soaked in NaOH Solution

R6_005 Rusnaldy Rusnaldy, Susilo Adi Widyanto, Natalino Fonseca D. S. Guterres and Achmad Widodo

The Effect Of Chill Used In The Ductile Iron Casting Process To Gear Manufacture Application On The Wear Resistance

R6_039 Lilis Kistriyani, Muhammad Khafidh, Donny Suryawan and Rifky Ismail

Physical Characteristic of Polymer Formulations For Phrosthetic Foot Materials : Comparison of Natural Rubber and Ethylene Vinyl Acetate

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R6_017 Mira Wisman and Rina Febrina Comparison Of Characteristics Of Mixed Asphalt Concrete-Wearing Course (Ac-Wc) Using Conventional Asphalt And Modified Polymer Asphalt

R6_040 Ar Razi Alvee, Rizka Malinda, Alfie Muna Akbar, Resa Dwi Ashar, Cut Rahmawati, Sri Mulyaningsih and Lusi Dwi Putri

Influence Of Nanosilica And Crystalline Admixture On The Short-Term Behaviour Of Buried Underground Geopolymer Paste

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Abstracts

Paper ID : 1 Title : Groundwater Aggressiveness in Jonggrangan Karst, West Progo Area Author(s) : T. Listyani R.A. Abstract : The Jonggrangan Karst is located in the center of the West Progo Dome area. This karst landscape is less developed, but phenomena of karstification are still common. The aggressiveness of groundwater generally controls the dissolution of carbonate rocks in karst areas. This paper aims to analyze the characteristics of groundwater aggressiveness in the Jonggrangan Plateau based on the level of groundwater aggressiveness of the seven springs in the dry and rainy seasons. The saturation index value was obtained based on groundwater chemistry data and processed using PHREEQC software. The results showed that all springs have groundwater which tends to be aggressive in the dry season (SI = -0.82 to -0.08), while in the rainy season varied (aggressive and saturated water) with an SI value of -0.44 to 0.47. This indicates that groundwater tends to be aggressive in the dry season and able to dissolve limestone more intensively. In contrast, during the rainy season, the dissolution rate is quite high, and saturation is reached immediately. The different characteristics of groundwater aggressiveness are more influenced by the condition of the pH of groundwater. Aggressive groundwater conditions in the dry season indicate that local groundwater flows are more developed in the study area.

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Paper ID : 2 Title : The effect of slat clearance and flap on the aerodynamic performance of the NACA 43018

wing in the landing process Author(s) : Fungky Dyan P, Arif Wahyudi, Wawan Aries Widodo, Setyo Hariyadi S P Abstract : Combining several high lift devices on airplanes is a natural thing. High lift devices are used to control aircraft movements and improve aerodynamic performance. The landing phase in flight is vulnerable and requires good control, especially aircraft wing control that uses high lift devices. High lift devices such as slat clearance and flap are commonly used, but variations in their geometry always produce different and interesting phenomena to be explored further. This research was conducted numerically on a rectangular wing with NACA 43018 airfoil. This study will compare the rectangular wing with a wing that uses a combination of slat slots (slat clearance) and flaps in steady flight conditions. The angle of attack used in this study is (α) = 0o, 2o, 4o, 6o, 8o, 10o,12o,15o, 16o,17o,19o, and 20o. Ansys 18.1 software with k-ε Realizable turbulent model is used to help the numerical simulation. The combination of slat clearance and flap results in a higher total drag coefficient and higher lift coefficient. However, the rectangular wing produces better aerodynamic performance. Visualizing the velocity pathline and wall shear stress shows that the rectangular wing is easier to separate than the combined flap δT = 30o and slat δL = 0o.

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Paper ID : 3 Title : Ground Water Flow Monitoring Systems Using Permeability Tank Experiment Author(s) : Muhammad Mukhlisin, Azizah Wismaningsih, Hany Windri Astuti, Amin Suharjono, Sri

Anggraini Kadiran Abstract : As part of the water cycle, groundwater is a major contributor to flow in rivers and has a strong influence on landslide. This paper proposes a landslide early warning system for detecting landslide. Our aim is to analyze the groundwater flow by conducting laboratory test in Politeknik Negeri Semarang, Semarang City on groundwater flow detectors’ sensors accuracy on rainfall, water level and soil moisture content. We undertook this research by employing LoRa and testing the performance of sensors on groundwater flow using a rainfall sensor, a soil moisture content detector using a capacitive soil moisture sensor, and the water level detector using the VL53l0X sensor and tested using a permeability tank. We used Muntilan sand which is categorized as well-graded sand in our experiment. The results of rainfall sensor test resulted in an effluent value of 0.053 inch or 1.346 mm of water, while the water level sensor produced an average error of 0.02667 for object distance testing, and for soil moisture sensors in dry sand, it produced ADC 2.94 V while wet sand results in 2.084 V. We conclude that the accuracy of rainfall and water level are good, while for soil moisture content is bad due to sensor’s sensitivity since the operating voltage is 3.3 ~ 5.5 VDC.

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Paper ID : 4 Title : Pb (II) and Cu (II) adsorption performance using magnetic modified watermelon rind as a

low-cost adsorbent Author(s) : AYD Lestari, Z Salimin, Sukirman, AN Pasha, M Humami, MF Putra, IA Amar Abstract : Polluted water that contains heavy metals, especially Pb(II) and Cu(II) could cause many health issues which could be controlled by adsorption. Low-cost adsorbents from magnetically modified watermelon rind (MMWMR) were successfully made to adsorb Pb2+ and Cu2+ in synthetic wastewater. Watermelon rind is modified with Fe2O3 at several variation of ratios [1:1, 1:2, 1:3, 1:4, and 1:5 (w/w)] and conducted in several variation of temperatures [30°C, 40°C, 50°C, and 60°C]. Adsorbents are characterized by FTIR and AAS. The analysis results showed that modifying watermelon rind with magnetic particles has a very good potential for the development of low-cost bio sorbent. MMWMR has a potential to adsorb Pb (II) and Cu (II) well with in modifier ratio 5:1 at 60°C, the adsorption removal are 98% and 96%, respectively.

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Paper ID : 5 Title : The effect of chill used in the ductile iron casting process to gear manufacture application

on the wear resistance Author(s) : Rusnaldy, Susilo Adi Widyanto, Natalino Fonseca DS Guterres, Achmad Widodo Abstract : Ductile (nodular) iron has and continues to find wide use in the production of many industrial components. Because it has good ductility, easy to machining, has high toughness, and can be cast for complex components. There have been many methods used for surface hardening of nodular cast iron to high wear resistance, one of them is to use chilled casting because chill is the fast cooling rate in the mold and chill is the diffusion material. This research tries to use the chilled casting method. The purpose of this research is to harden the surface of the Y shape of the pattern so that it gets a thin layer and hard layer to apply to the gear manufacturing process according to the ANSI/AGMA standard recommendations. Stainless steel is used as a chill to coat the surface. An optical microscope, SEM-EDX, Vickers hardness testing and the wear test was carried out. The results show that the structure of eutectic carbide and (FeCr)7C3 has formed 5.71%Cr in the chill-coated area and the diffusion thickness layer is 0.57 - 0.60mm so that the surface area has high hardness (943.76 HV) and produces good wear resistance based on ANSI/AGMA standard recommendations.

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Paper ID : 7 Title : Geomorphological Quantitative Analysis for Interpretation of Geological Structures as the

Basis for Decision Making on Coal Exploration Activities in East Kutai Regency, East Borneo Province

Author(s) : Mesias Citra Dewi Abstract : The research area is located in the District of Bengalon, East Kutai Regency, East Borneo Province. This study aims to determine the location of fault structures as a crucial decision making for coal exploration activities in the study area. This research was conducted through quantitative geomorphological analysis. The study area is dominated by rocks dominated by clay and sand of middle to late Miocene age. Based on DEM-SRTM (Digital Elevation Model – Shuttle Radar Terrain Mission) analysis and river flow patterns, it is known that in the study area has geological structures are syncline and anticline.

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Paper ID : 8 Title : Quality Level Measurement Analysis Using Six Sigma DMAIC Method Author(s) : Agus Hindarto Wibowo, Windyaning Ustyannie, Argaditia Mawadati, Syauqi Rahman

Wibowo Abstract : CV Sinar Albasia Utama is an industry where wood is used as the raw material, and their product is barecore which can reach ± 426,970 production units per year. CV Sinar Albisia Utama always does the best to satisfy the customers’ needs and strives to produce high quality products, since the products are exported to China and Taiwan, and they conduct quality improvements continually. In this study, the researchers used Six Sigma method in measuring and processing data, by implementing DMAIC methodological stages, namely Define, Measure, Analyze, Improve, and Control. The Defect Per Million Opportunities (DPMO) value of the products in the last 1 year was 2065.133 with 4 Critical-to-Quality (CTQ), including the unsuitable size which causes the wood to be not tight (60.16%), unsuitable thickness (26.11%), untidy wood cutting (9.92%), and wood is not completely dry so it is getting rotten (3.79%). The results revealed that that the company sigma level is 4.4, or in other words, the company is in a very good and productive condition, and it is able to compete globally.

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Paper ID : 9 Title : Preliminary Design of Composite Safety Shoes Toe Cap Using Finite Element Method Author(s) : Hendrix Noviyanto F, Samsudin Anis Abstract : The toe cap is a substructure of safety shoes designed to protect the toes from impacts or compression load. This research goal is to define the toe cap design structures that meet the criteria. The criteria of the toe cap design structure must have the capability to withstand a compression load of 15 kN with minimum clearance as referred. Many materials for toe caps are available in the market, but metals and composites are the most popular. Steel is a metal that is generally widely used as a toe cap structure compared to aluminum and copper. Composite toe caps are becoming a trend besides steel toe caps. It's because composite toe caps are light in weight, and have better characteristics in heat and electricity. The material candidates for the toe cap are steel, aluminum, composite carbon/epoxy, composite e-glass/epoxy, and composite kevlar/epoxy. The selecting material needs to be done to get the suitable material for the toe cap. The process of selecting materials is conducting by modeling and stress analysis of toe cap using MSC Patran/Nastran. The model for material selection is called Model A, with dimensions of 120 mm x 80 mm x 50 mm. Model A is a simple design with the corner on the edge of the toe cap design. The result shows that composite carbon/epoxy is a suitable material for the toe cap. Aside from model A, it also makes another model was called model B as an alternative design. Model B was designed based on model A by changing corners with fillets hope to have better stress distribution and reduction in weight. The process continues with running stress analysis for both models, and the result shows that Model B is favored over model A. Model B shows better stress distribution and reduction in weight by 5.7% than model A as the prediction.

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Paper ID : 11 Title : Optimization Waste Disposal Route Using GIS in

Yogyakarta Municipality Author(s) : Muchlis, Sri Hastutiningrum, William Sutrisna Abstract : The rapid growth of Yogyakarta's population has resulted in an increase in domestic waste. Waste disposal routes can be optimized using GIS. Research aims to optimize the waste disposal route from the temporary collection (TPS) site to the landfill using a Geographic Information System (GIS). Data on vehicle mileage was obtained by following 35 waste disposal vehicles starting from the vehicle pool to each TPS to heading to landfill. Arc GIS is used to get the optimal route of the data obtained. The results of the optimization are compared with the existing waste disposal routes. Total existing mileage by all waste vehicles is 1606.73 km, while the alternative mileage using GIS is 1416.7 km. Waste disposal routes can be cut down by 13.4%. It is possible to save Rp. 248,243 every day by shortening the path.

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Paper ID : 12 Title : Comparison of Fuzzy Mamdani and Backpropagation Artificial Neural Network

Methods to predict Yogyakarta Human Development Index Author(s) : Noeryanti, Pratiwi N, Fariasi S, Nurnawati EK Abstract : The Human Development Index (HDI) is one of the most important indicators to measure success in national development. This study aims to predict the best data pattern by finding the most miniature Mean Square Error (MSE) using HDI data for the last ten years in Yogyakarta to predict the HDI level in 2022. The method used in this study is to compare the Mamdani Fuzzy and the Backpropagation Artificial Neural Network (ANN) Method in the following order: fuzzification, rule-based formation, implication, and inference function formation, defuzzification, and capture prediction results. The analysis results of the Fuzzy Mamdani method obtained MSE = 44.93 and MAPE = 0.06, while the Backpropagation ANN method received MSE = 0.08 and MAPE = 0.02. The results of HDI predictions in Yogyakarta in 2022 obtained predictions from the value of the input variables AHH, HLS, RLS, and PPD in 2020 with the fuzzy Mamdani method of 90 in the very high category and with the Backpropagation ANN method of 77.66 in the high class. The prediction accuracy results of the two ways, the Backpropagation ANN method, produce the best Yogyakarta HDI predictions with the smallest MSE and MAPE values.

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Paper ID : 13 Title : Characteristics of Parijoto Fruit as a Preservative Of Dodol Food Author(s) : M Ansori, Wahyuningsih, S Fathonah, Rosidah, N A H Yulianti Abstract : In previous research, it was studied the use of 4 different types of solvents in the extraction of Parijoto fruit for the purposes of making glutinous dodol food consisting of water solvents, 3% soda water solvents, 96% ethanol solvents and 96% acetone solvents. The highest tannin extracted from parijoto fruit extraction is with a 96% ethanol solvent (30mgTAE/100g), while the lowest is obtained with a water solvent (3.5 mg TAE/100g). The highest antioxidant capacity of Parijoto fruit extract is produced with ethanol solvents 96% (75%), acetone 96% (72%), soda water 3% (60%) and water (53%). This research continues the process of characterization of parijoto fruit and how it is extracted for the benefit of food preservation of dodol. Parijoto fruit is subject to testing: vitamin C levels, beta carotene levels, total microbial plate count (TPC). Similarly, testing is applied to extracts from parijoto fruit and dodol foods with the addition of extracts from parijoto fruit. Four different solvents remain used in the parijoto fruit extraction process for the purposes of making glutinous dodol food, consisting of water solvent, 3% soda water solvent, 96% ethanol solvent and 96% acetone solvent. Extraction of antioxidant capacity from Parijoto fruit with 4 types of solvents is classified as satisfying for all. Based on tests of the level of durability of dodol from fungal growth it is known that the use of parijoto fruit extract extracted with 96% ethanol and water (control) in the manufacture of dodol, so far able to preserve dodol for up to 38 days without any mould growth in open space. While the use of 96% acetone solvent in the extraction of Parijoto fruit is less able to give durability to dodol judging from the growth of fungi that began to exist when dodol was stored for 10 days. The high content of vitamin C in parijoto fruit (348.53mg / 100g) is thought to have a strong share in the durability of dodol with the addition of fruit extract. The content of beta carotene in parijoto fruit is also quite high (3308.76 ug/ 100g). Ease of extracting it using 96% acetone solvent. But it has not been proven to have a hand in the preservation of dodol, considering its addition to the manufacture of dodol does not increase the shelf life of dodol.

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Paper ID : 14 Title : Sales Pattern Identification for Marketing Strategies Using Data Mining Author(s) : Argaditia Mawadati, Andrean Emaputra, Kartinasari Ayuhikmatin Sekarjati Abstract : The development of the culinary business, such as food stalls, is increasing rapidly. This causes the competition to become even tighter. Food stalls must have targeted and precise strategies to survive and compete. Identifying the customer’s preference is one of the strategies that can increase sales and retain customers. The customer’s preference can be observed through purchase transaction data. Observation of sales transaction data in a simple way does not always get effective results because of the large volume of data processed and the difficulty in finding the association between one menu sales and another. With data mining, this problem can be overcome. In this study, the data mining method used is the Apriori Algorithm. The application of the apriori algorithm helps in forming candidate item combinations that may occur. Thus, it can be seen the relationship between the combination of menus that are sold, whether including the most frequently sold or not. This information can be taken into consideration to determine the next marketing strategies.

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Paper ID : 15 Title : Sliding Gate Opener System with Smartphone Control

Using Bluetooth Connection Author(s) : Budhi Anto, Amir Hamzah, Dahliyusmanto, Yonni Safadro, Fadly Arif Abstract : This paper presents the sliding gate opener system that android smartphones can remotely control using a Bluetooth connection. The gate opener is driven by 12-pole single-phase induction motor of permanent-split-capacitor type (PSC motor) coupled with right-angle worm gear and rack-pinion power transmission. To obtain subjacent velocity of the gate opener, worm gear which has a 50:1 speed ratio has been selected. The wiring of PSC motor installation is designed so that the PSC motor can rotate either forward or in the reverse direction by using contactors arrangement which is controlled by Arduino microcontroller module. Moreover, the microcontroller module has been wired with Bluetooth transceiver HC-06 enabling it to communicate with other devices using a Bluetooth connection. The microcontroller module has been programmed so that the gate opener movement can be remotely governed from android smartphones and can be controlled at the site (local-control) by operating a set of pushbutton switches mounted onto the door of the control panel which is placed near the motor installation site. In addition, there are 2 limit switches installed at the ends of the gate opener movement to give information to the microcontroller to stop the motor automatically when they are touched by the gate opener. The functional test has been conducted on the sliding gate opener system and the result shows the gate opener movement can successfully be controlled locally through pushbutton switches and remotely using an android smartphone with a distance of up to 8 meters.

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Paper ID : 16 Title : Integration of Geospatial Technology with Evacuation Pathway Planning for

Tsunami Mitigation Author(s) : Rina Febrina, Lusmeilia Afriani, Mira Wisman Abstract : A tsunami is an unavoidable natural disaster. However, the mitigation of a tsunami impact can be achieved effectively. This study aims to determine particular evacuation points and estimate the number of fatalities. Analytical Hierarchy Process (AHP), Geospatial technology, and ArcGIS 10.6. were used for the aims, and the elevation model, land use, coastline and road network were analysed. It was found that that 65 evacuation points with 91 evacuation routes were successfully identified. Furthermore, the simulations estimated 64.40, 61.80, 61.50, 55.70, 51.40, and 35.20% of dead people at Pandan Bay, Ratai, Bandar Lampung, West Coast, South Lampung, and Semangka Bay, respectively. Moreover, the average distance and timing computed from the simulations were 1,907 meters and 30 minutes 48 seconds, respectively. Therefore, the findings of this study can be beneficial for researchers in estimating evacuation points and fatalities number of tsunami disaster.

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Paper ID : 17 Title : Comparison of Characteristics of Mixed Asphalt Concrete-Wearing Course (AC-WC)

Using Conventional Asphalt and Modified Polymer Asphalt Author(s) : Mira Wisman, Rina Febrina Abstract : The increase in commercial vehicles and an increase in air temperature which increases the pavement temperature result in a decrease in pavement performance (deterioration). One alternative treatment is the use of polymer modified asphalt. The use of polymer modified asphalt (PMA) produces a mixture with higher stability at high pavement temperatures. This study aims to determine the effect of modified polymer asphalt on marshall characteristics and the resistance of asphalt concrete – wearing course (AC – WC) mixture compared to conventional asphalt, namely Pertamina Pen 60/70 asphalt. This study uses a quantitative approach, experimental methods, and research and development (R&D) techniques with several stages, ranging from material preparation, material inspection, mix planning, to marshall test and wheel tracking machine test. The results showed that the asphalt concrete – wearing course (AC – WC) mixture using modified polymer asphalt (JAP 57) had high stability and durability values, so the mixture was stiffer than conventional asphalt (Pen 60/70). Dynamic stability was obtained with a mixture of AC – WC using modified polymer asphalt (JAP 57) of 875 passes/mm while conventional asphalt (Pen 60/70) was 1067.8 passes/mm. Likewise, the speed of deformation obtained with a mixture of AC – WC using modified polymer asphalt (JAP 57) is 0.0480 mm/minute, while conventional asphalt (Pen 60/70) is 0.0393 mm/minute. So when compared between modified polymer asphalt (JAP 57) and conventional asphalt (Pen 60/70), modified polymer asphalt (JAP 57) is better than conventional asphalt (Pen 60/70). 0480 mm/minute, while conventional asphalt (Pen 60/70) is 0.0393 mm/minute. So when compared between modified polymer asphalt (JAP 57) and conventional asphalt (Pen 60/70), modified polymer asphalt (JAP 57) is better than conventional asphalt (Pen 60/70). 0480 mm/minute, while conventional asphalt (Pen 60/70) is 0.0393 mm/minute. So when compared between modified polymer asphalt (JAP 57) and conventional asphalt (Pen 60/70), modified polymer asphalt (JAP 57) is better than conventional asphalt (Pen 60/70).The results of this study are expected to provide an overview of the benefits for the development and consideration of making hot asphalt mixtures, especially in areas that have hot temperatures and heavy traffic loads.

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Paper ID : 18 Title : Implementation of Analytical Hierarchy Process Method with Eigen Vector Efficiency

for Culinary Object Selection in Aceh Author(s) : Nurnawati EK, Husna J, Yusra, Setiawan I Abstract : Aceh Province, known as the Veranda of Mecca, is one of the regions in Indonesia that has a variety of culinary delights and is a tourist attraction. The number of culinary places makes it difficult for foodies and tourists to choose a place that suits their tastes. The search focuses on keywords that take time to analyse one by one the information obtained from search engines and from websites that provide culinary tourism. This study aims to develop a decision support system (DSS) to help tourists and the public make decisions in choosing culinary places in Aceh. The method used in this research is the analysis using the Analytical Hierarchy Process (AHP) method with the criteria of price, menu, distance, time, healthy food and facilities. The ranking is done by using the Eigen factors to Eigenvalues to rank criteria by synthesizing paired matrices. The application is built on a web-based basis so that it is easily accessible by users. The results of this study are the application of a decision support system for the selection of culinary tourism spots to assist tourists and the public in choosing the right culinary place. In addition to facilitating decision making, this system can also be a means of introducing culinary tourism to the world so as to attract tourists to visit Aceh.

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Paper ID : 19 Title : Fluid Flow Visualization and Parameter Evaluation of Vegetable Oil/ Water Mixture

in Taylor-Couette Column Author(s) : Adhi Kusumastuti, Samsudin Anis, Nur Qudus Abstract : The flow between two concentric cylinders, i.e., the Taylor- Couette flow, was investigated when only the inner cylinder rotates. Analysis of flow pattern with the Reynolds number was carried out by flow visualizations. Shear stress and energy loss distribution within Taylor-Couette column were determined. The characterization study was carried out by applying water and used cooking oil at volume ratio of 1:1, 1:3, 1:5, and 1:6. The inner cylinder was rotated at 400 rpm. It was found that optimal volume ratio for wastewater treatment was 1:1, shown by the phenomenon of Modulated Wavy Vortices flow regime. The highest Taylor number of 1.37x107 was also achieved in the volume ratio, while the shear stress was -3.32.

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Paper ID : 20 Title : Analysis of Green Open Space Adequacy Malahayati

University Area In Absorbing Carbon Dioxide Emissions Author(s) : Ergantara RI, Fadilasari D, Wardana MW Abstract : Malahayati University (Unmal) is one of the campuses that has an eco-campus program to reduce the impact of climate change. One of campus strategies is to develop green open spaces in the Unmal area by maximizing the absorption of carbon dioxide emissions by plants. The purpose of this study was to determine the emissions produced within the Unmal area and to evaluate the adequacy of the absorption capacity of carbon dioxide emissions by green open space-filling trees. The analysis was carried out by calculating emission method from motorized vehicles referred to Indonesian Ministry of Environmental No. 12, Year of 2010; electricity use; LPG and diesel within IPCC (2006); the number of trees using census and sampling method; and absorption capacity obtained from literature studies. The result shows that the total carbon dioxide emission within Unmal area was 209,108.32 g / hour. The highest carbon dioxide emission was contributed by electricity (85.6%), which was then followed by vehicles (8.5%), LPG consumption (2.7%), and diesel consumption (3.2%). Furthermore, the carbon dioxide absorption in the Unmal area was 777,747.52 g / hour, which makes the current green open space in the Unmal area is sufficient to absorb carbon dioxide emissions. Re-planning of green open space was recommended through effective tree selection. For this purpose, twenty tree species with high carbon dioxide absorption were selected including 1) trembesi (Samanea saman), 2) mahoni (Swietenia macrophylla), 3) Daun kupu-kupu (Bauhinia purpurea), 4) pulai (Alstonia scholaris), 5) beringin (Ficus benjamina), 6) glodokan tiang (Polyalthia longifolia), 7) angsana (Pterocarpus indicus), 8) mengkudu (Morinda citrifolia), 9) jeruk (Citrus), 10) jambu air (Syzygium aqueum), 11) cengkeh (Syzygium aromaticum), 12) sengon (Albizia chinensis), 13) dadap hijau (Erythourina variegata), 14) akasia (Acacia auriculiformis), 15) asam landi (Pithecellobium dulce), 16) lamtoro (Leucaena leucocephala), 17) keben (Barringtonia asiatica), 18) melinjo (Acacia auriculiformis), 19) pucuk merah (Oleina syzygium), 20) Bintaro (Cerbera manghas).

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Paper ID : 21 Title : Nutritional Characteristics of Sagon Cake With Breadnut Seed (Artocarpus

communis G. Forst) Flour by Variations of Flouring Process Author(s) : Octavianti Paramita, Fitriyani Irfanti Abstract : One of the traditional Indonesian foods that is rarely found and less well known by the wider community is sagon cake. To increase the nutritional content and diversify processed sagon cakes, it is necessary to replace glutinous rice flour with other flours. One of the efforts that can be done in supporting national food security is by utilizing the potential of local food sources that have not been utilized optimally, one of which is breadnut seed (Artocarpus communis G.Forst), which the local people call it kluwih. The results obtained from the sagon cake in the initial experiment had a weakness, which was after a few days through the storage period the aroma and taste of the sagon cake began to change. Based on this, the researchers wanted to improve the sagon cake by improving the quality of breadnut seed flour. To improve the weakness of the sagon cake, the researchers made improvements to the process of making breadnut seed flour through variations in flour. The method of making breadnut seed flour in this study used 3 flour variations, namely the dry method, the blanching method with the addition of Na-Metabisulfite and the fresh (raw) seed method. In this study, an analysis of the chemical composition of breadnut seed flour sagon cakes with variations in flouring process was carried out, namely the content of protein, fat and carbohydrates; analysis of protein content according to AOAC, fat content according to AOAC and carbohydrate by difference. Based on the chemical test, the sample of sagon cake with breadnut seed flour by dry method had an average protein content of 1.914%, fat 4.24%, carbohydrates 11.848%. The sample of sagon cake with breadnut seed flour by blanching method with Na-Metabisulfite had an average protein content of 2.588%, fat 4.02% and carbohydrates 14.539%. The sample of sagon cake with breadnut seed flour by fresh method (raw) had an average protein content of 1.865%, fat 4.62% and carbohydrates 14.831%. It can be concluded that the flour blanching method with Na-Metabisulfite produces the highest protein and carbohydrate content and has the lowest fat content.

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Paper ID : 22 Title : Utilization of Lorotis Weed (Aeschynomene Indica) as Natural Textile Dyes: Soil

Pollution Prevention in the Use of Pesticides Author(s) : Atika, Endah Rinasti, Wulansari P, Musdalifah, Siti Nurrohmah Abstract : The growth of weeds as “undesirable” plant needs to be controlled. One of the main controllers for weeds elimination is using pesticides. However, pesticides cause pollution towards soil, water, air, and human. Alternatives are needed in controlling weeds. One way is by using weeds as textile dyes. The type of weeds to be experimented with is Lorotis weed (Aeschynomene Indica). Results of the study showed that Lorotis weed has the potential to be used as a textile dye. Textile dyeing process needs to be supported by mordanting process. Iron sulfate mordant is proven to produce color with the highest level of color intensity. While the color fastness test showed that quicklime mordant has a good fastness level.

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Paper ID : 23 Title : Colorfastness of Batik Dyed with Dyes from Banana Hump Author(s) : Wulansari Prasetyaningtyas, Feny Fitria Kartika Abstract : Batik coloring using natural dyes is appreciated because it is environmentally friendly. Banana hump is one of the natural ingredients that can be used as an alternative to be used as batik dye. The purpose of this study was to determine the color fastness to washing and the color fastness to rubbing on batik cloth dyed using dyes from banana hump. The color fastness test is carried out through laboratory tests by observing changes in the original color of the test sample, using a gray scale standard to assess color stains on white fabrics. The results of the color fastness test against washing showed that quicklime had good criteria when compared to the use of Tunjung mordant and lime mordant. The three mordant have good criteria in testing the color fastness to rubbing with an average value of 4 on the use of quicklime mordant, while for Tunjung mordant and lime have an average value of 3.5.

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Paper ID : 24 Title : Internet of Things on Smart Parking Systems Based on Vehicle Loop Detector Author(s) : Uning Lestari, Catur Iswahyudi, Beni Firman Abstract : The use of ICT (Information and Communication Technology) in various fields has developed rapidly. One of them is in the field of parking services. As the number of vehicles grows rapidly, causing an unbalanced growth between the number of vehicles and available land, this can be seen from the increasingly narrow parking spaces in every public place. It’s difficult for drivers to find out the availability of parking spaces (parking slots) in a parking lot. This causes ineffective time because the driver takes a long time to find a parking space that is still empty, so that the road conditions become chaotic and often this causes congestion on the main roads. Therefore information about the availability of parking spaces is very important for drivers who will park their vehicles. This mobile-based parking reservation application equipped with parking location map features, parking slot availability information, parking slot booking, and features for parking administrators which include monitoring the status of parking slot availability. This system can solve conventional parking problems into a parking system that is more effective and efficient and benefits many parties, namely the driver, parking manager and other road users. In its application at the Yogyakarta City Hall parking lot, the number of cable loops used is 3 types of sizes, namely a cable with a stretch of 1x2.5 meters with a total loop of 11 loops, a cable with a stretch of 1x2 meters with a total loop of 10 loops, and a cable with a stretch of 1x0.5 meters with a total of 23 looping. These three types of cables are used at six parking locations. All types of looping cable sizes applied to the parking sensor can work well as evidenced by the green indicator can respond to 300 ms while detecting a four-wheeled vehicle at the parking location.

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Paper ID : 25 Title : Design of Heart Rate Monitoring System Using Mobile Telecardiac and Showing The

Patient’s Position. Author(s) : Samuel Kristiana, Gatot Santoso, Slamet Hani, Toto Rusianto, Agung Wahyu

Nugroho Abstract : Human heart beats between 60 and 100 times in a minute, if more than that means the heart is experiencing an abnormal beat. An abnormal heartbeat is called arrhythmia. The purpose of this study is to detect heart rate through photoplethysmograph signals and the patient's position can be known using the global position system (GPS) on the georaphic information system (GIS). Photoplethysmograph which is used for monitoring heart rate by looking at changes in blood volume in blood vessels. The heart rate test from the pulse sensor is processed at the ADC in the microcontroller, and heart rate data is sent via bluetooth media to the patient's cell phone, with the mobile telecardiac system the data can be seen by doctors or nurses and ambulance units. In the simulation of the tool, samples of heart rate data were taken from 10 normal people. The average sensor output voltage value is 0.437 volts with an average heart rate of 72 bpm. Patients with heart rate arrhythmias can be divided into 2 types, namely bradycardia (small 60 bpm) and tachycardia (greater than 100 bpm). The results of testing the number of detected heartbeats are displayed on the smartphone in the form of a signal. This study provides an arrythmia detector where if the heart rate is less than 60 bpm it includes symptoms of arrhythmia called bradycardia (weak heartbeat), whereas if the heart rate is more than 100 bpm then it is a symptom of arrythmia. Based on the research that has been done, the tool has an average error of 0.87% in reading heart rate.

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Paper ID : 26 Title : Working Posture Analysis On Press Tile Using Rapid Upper

Limb Assessment Author(s) : M. W. Wardana, Ahmad Sidiq, Nanda Ari S Abstract : Occupational health is one of the things that must be considered in doing a job. One of the problems that often arises is the presence of complaints of Musculoskeletal Disorders (MSDs) experienced by workers, but usually this complaint occurs after a long period of work, this usually occurs in small industries where the method of body posture analysis is often ignored. The achievement of worker health cannot be separated from the role of ergonomics, as one of the sciences that studies human interaction and the work environment. The purpose of this study was to analyse workers body posture when working on pressing department at a tile factory. To analyse the body posture using the Rapid Upper Limb Assessment (RULA) method. From the results of RULA, the final score is 7, so an immediate improvement of the work posture is needed, and further studies are needed to improve the posture, either from the worker’s posture or adding equipment that can help the job.

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Paper ID : 27 Title : The Study of Carbon Dioxide Emissions from Motor

Vehicles At Malahayati University Author(s) : Ergantara, R.I, Maulana, D, Fadilasari, Wardana, M.W. Abstract : One of the causes of global warming is carbon dioxide emissions. Educational activities within campus such as in Malahayati University (Unmal) contribute to generating carbon dioxide emissions. These carbon dioxide emissions come from transportation activities, electricity consumption, gas, diesel, septic tanks, and others. This study aimed to determine the number of carbon dioxide emissions from motorized vehicles in Malahayati University which is divided into three locations. The carbon dioxide emissions were calculated from the number of vehicles, length of the road, emission factor, and energy-specific consumption. The result shows that the highest carbon dioxide emission of motorized vehicles was located in the back entrance of campus, front entrance, dormitories, and apartments. Total carbon dioxide emission was 4,897.73 g / hour; 3,028.28g / hour; and 2,524.46 g / hour respectively. The highest number of motorized vehicles and the length of road have positively correlated with the increase of carbon dioxide emissions in Unmal.

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Paper ID : 28 Title : The Impact of The Use of Different Mordan Types on The Ecoprint Dyeing Using

Secang Wood (Caesalpinia Sappan Linn) Dye on Primissima Fabric. Author(s) : Roudlotus Sholikhah, Widowati, Sita Nurmasitah Abstract : The purposes of this study are (1) to determine the effect of mordan tawas, tunjung, and tannins on the ecoprint dyeing result using secang (caesalpina sappan linn) wood dye on primisima fabrics (2) to find the best results in ecoprint dyeing using different types of mordan including the pattern clarity, color sharpness, color fairness, and color absorption. The method of this research is experimental. The independent variables are mordan tawas, tunjung, and tannins. The dependent variables are the ecoprint dyeing results including the pattern clarity, color sharpness, color fairness, and color absorption. The control variables are secang (caesalpina sappan linn) wood dye, mordaning technique, and primisima fabric. The data of the study were collected by using observation. There were 6 ecoprint treatment samples used in the design of this study, i.e. sample A - using mordan tawas on the main fabric, secang (caesalpina sappan linn) wood dye on blanket, and mordan tawas in the fixation; sample B - using mordan tawas on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tunjung in the fixation; sample C - using mordan tunjung on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tawas in the fixation; sample D - using mordan tunjung on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tunjung in the fixation; sample E - using mordan tannin on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tawas in the fixation; and sample F - using mordan tannin on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tunjung in the fixation. The analysis results show that: (1). Based on the pattern clarity test, sample C and E have the clearest pattern, which is 4,55 and 4,575 respectively. Sample A has a “clear” pattern, which is 4.25. Sample D and F have an “average” pattern, which are 3,775 and 3,525. Sample B has a “less clear” pattern, which is 2,775. (2) Based on the color

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sharpness test, sample C has the sharpest pattern, which is 4,55. Sample E has a “sharp” pattern, which is 4,25. Sample A and D have an “average” color sharpness, which is 3,25. Meanwhile, samples B and F also have “average” color sharpness, which are 2,525 and 2,825 respectively. (3) Based on the color fairness test, sample E has the fairest color, which is 4,05. Sample C and D have “fair” colors, which are 3,75 dan 3,825 respectively. Meanwhile, samples A, B and F have “average” color fairness, which are 3,05, 2,525 and 2,525 respectively. (4) Based on the color absorption test, sample E has the best color absorption, which is 4,05. Sample A’s and C’s color absorption is “good”, which are 3,775 and 3,557. Sample B’s, D’s, and F’s have “average” color absorption, which are 2,575, 3,05 and 2,825. (5) Based on the test of pattern clarity, color sharpness, color fairness and color absorption, the best ecoprint treatment is shown in sample C - which is the ecoprint treatment using mordan tunjung on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tunjung in the fixation, and sample E - which is the ecoprint treatment using mordan tunjung on the main fabric, secang (caesalpina sappan linn) wood dye on the blanket, and mordan tawas in the fixation.

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Paper ID : 29 Title : Mechanical Properties of Geopolymer Mortar Based on Fly Ash with

Polypropylene Fiber Author(s) : Ria Zulfiati, Fakhrul Rozi Yamali Abstract : Geopolymer concrete is an environmentally friendly material that can be developed as an alternative to cement concrete in the future. In this study, the binding material used as a substitute for cement is fly ash. The use of fly ash as a substitute material for cement has been widely used, especially in geopolymer concrete. In this study, the artificial fiber used was polypropylene fiber. Polypropylene fibers are one of the alternatives to the use of artificial fibers in geopolymer mortar composites. This study conducted strong press testing and flexible strength testing with variations in the percentage of fibers used 0.25% and 0.50% of the mortar weight. This geopolymer mortar is made from 100% fly ash. The concentration of NaOH solution used is 14 M and 16 M. The results of this study showed that the fiber percentage of 0.50% at NaOH concentration of 16 M provides a compressive strength of 43,936 MPa and the greatest flexural strength of 9,261 MPa.

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Paper ID : 30 Title : Compressive Strength Geopolymer Mortar with Fine Aggregate Soaked in NaOH

Solution Author(s) : Wari Dony, Ria Zulfiati, Amsori Muhammad Das Abstract : Geopolymer mortar is a mortar based on fly ash derived from coal combustion waste as a substitute for whole cement or mortar without cement which provides an environmentally friendly and efficient effect in terms of energy utilization. In contrast to cement which undergoes a hydration reaction with water to produce a binder, fly ash which is rich in silicon (Si) and alumina (Al) elements will react when mixed with an alkaline activator solution. The alkaline activator solution used is Na2SiO3 and NaOH with a mixing ratio of 1,5 where the variation of NaOH concentration used is 9 and 13 molar. The fine aggregate used was taken from the Batanghari River which was soaked with NaOH solution. Based on the research, the average flow value is 112,3% and the compressive strength of geopolymer mortar 9 and 13 Molar respectively for the age of 7 days = 26,03 and 34,02 MPa, 14 days = 32,01 and 43,01 MPa, 28 days = 35,36 and 48,40 MPa. The compressive strength of the geopolymer mortar with a concentration of NaOH 13 Molar is closer to the value of a cement mortar compared to a concentration of 9 Molar.

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Paper ID : 31 Title : Analysis of The Causes of The Difference In Financing Prices on Road

Improvement in Tanjung Jabung Timur Regency Author(s) : Elvira Handayani, Kiki Rizky Amalia, Fakhrul Rozi Yamali, Anisa Ramadona Abstract : Road is one of the transportation infrastructure that has an important element in the development of life in advancing the welfare of the community. In the development of an area, transportation has a very important role to support the progress of an area that involves development sectors such as economy, politics, security, social and culture, therefore the relevant agencies carry out road repairs to improve and support the smooth running of community activities. The analysis of the factors causing the difference in financing prices at the road improvement stage is a quantitative study that aims to determine the dominant factors that cause the difference in financing prices. The study was conducted in East Tanjung Jabung Regency and the data obtained through a questionnaire survey with the respondents studied were contractors who had been involved in the implementation of road improvement and road improvement data in 2020 taken from the public works department. The collected data was then analyzed using quantitative methods. To find out the dominant factors that can result in the difference in financing, the mean analysis and factor analysis are carried out. The questionnaires were taken as many as 22 respondents in zone 1, zone 2, and zone 3 in Tanjung Jabung Timur Regency. The dominant factors that can cause the difference in financing prices at the first road improvement stage are natural factors with an average of 4.17, the second is human factors with an average of 3.75, the third is equipment factors with an average of 3 .64, the fourth environmental factor with an average of 2.85, the fifth material factor with an average of 2.81 and the sixth cost factor with an average of 2.19.

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Paper ID : 32 Title : Pricing Strategy for Project Tender by Contractor Author(s) : Kiki Rizky Amalia, Elvira Handayani, Annisaa Dwiretnani, Rudy Harianto Abstract : An auction or tender is a series of work offering activities offered by the project owner to a contractor or consultant to obtain a bid price that is in accordance with the requirements, and has an accountable commitment. To win an auction, a strategy is needed. The purpose of this study is to analyse the strategies used by contractors in the city of Jambi in setting prices for participating in construction project tenders. This research was conducted by distributing questionnaires to contractors registered with the Construction Services Development Institute (LPJK) who worked on construction projects in Jambi City in 2018 and 2019. Of the 49 questionnaires distributed, only 30 questionnaires received responses. Based on the data on the distribution of the questionnaire, the project bid pricing strategy that is often used by contractors in the city of Jambi is model 4 with a mean value of 4.13 and a percentage of 17.20%, which is where the cost / mark up is determined entirely based on costs that are adjusted to the target. only after awarding the contract.

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Paper ID : 33 Title : Assessment of How Satisfaction with Service Quality and Service Value Affect

Passenger’s Loyalty to the MRT-SBK Service In Greater Kuala Lumpur Author(s) : Amsori Muhammad Das, Ari Setiawan, Wari Dony Abstract : Passenger loyalty in the context of public transportation is a measure of the level of passenger’s inclination to use the same public transport in the future. The present study aims to examine and identify the factors that shape passenger loyalty. Three factors, services quality, customer satisfaction, and service value, are believed to influence passenger loyalty. This paper presents a case study of the MRT-SBK service which involved 555 respondents. Results show that the MRT-SBK contributes to the increase in the use of public transport and greatly facilitate the mobilization of commuters in the Greater Kuala Lumpur area. Structural equation modelling was employed to investigate the relationship between service quality, customer satisfaction, service value, and passenger loyalty. Customer satisfaction has the strongest influence on passenger loyalty while service value has a direct and positive effect on passenger loyalty. This research has also found that service quality has a significant indirect effect on passenger loyalty via service value and customer satisfaction. The loyalty of commuters using the MRT-SBK line is strongly influenced by service attributes, including vehicle safety, convenience, punctuality, comfort, and cleanliness of the facility. This study helps MRT service provider to optimize their resources in order to enhance customer satisfaction, thereby enhancing passenger loyalty.

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Paper ID : 34 Title : Analysis of The Degree of Saturation Due to Influence Vehicle Speed in Office Area

in New Normal Condition (Case Study: Jalan H. Agus Salim Jambi City) Author(s) : Ari Setiawan, Azwarman, Rioni Rizki Aldiansyah, Riki Saputra Abstract : The balance between the growth of vehicles and the population of Jambi City can lead to traffic problems. The problem occurs in one of them on Jalan H. Agus Salim, which is an office area. Because the office area is not only influenced by the growth of vehicles but also influenced by vehicle parking. In the new normal condition with restrictions on working hours, the state of Jalan H. Agus Salim will affect road performance. Therefore, it is necessary to analyze the road performance and the relationship between speed and degree of saturation on Jalan H. Agus Salim. The result of calculating the average level of saturation of camels for each road section is 0.05 and 0.07, respectively, for road conditions in a state of not jammed. The result of saturation due to the influence of speed direction on Tugu Keris-Taman Remaja Jambi's determination coefficient value (R2) is 0.8328 with the equation model Y = 0.002 + 0.1218 X. The result of saturation due to the influence of speed on the direction of Taman Remaja Jambi-Tugu Keris determination coefficient value (R2) is 0.9024 with the equation model Y = 0.1255-0.002 X. The result of the degree of saturation due to the influence of speed can be concluded that when the speed is high, the degree of saturation is lower and with the implementation of new normal good road performance.

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Paper ID : 35 Title : Investigation of Carbon Footprint from School Activities: A Case Study in Jambi,

Indonesia Author(s) : A. Riyanti, Hadrah, AGK Azwar Abstract : The increase in GHG emissions every year is produced by various activities, including school. School is one of the educational institutions that contribute to the implementation of sustainability practices, one of which is through the identification of carbon footprints. This paper aims to calculate the carbon footprint from school activities and CO2 emission absorb by vegetation in school open spaces. In this study, the carbon footprint was carried out from several sources according to The GHG Protocol, i.e., electricity consumption, LPG use in the school canteen, paper use, and transportation activities. Data was collected by a questionnaire survey to teachers, staff, and students. Emissions from the activities are calculated in CO2eq. The results showed that the carbon footprint produced from school activities was 83.04 tonCO2eq/year, with the largest portion of carbon footprint coming from the transportation of students, teachers, and staff, followed by electricity, paper use, and LPG. The existing vegetation in the school open space is only able to absorb carbon of 3 tonCO2eq/year from the total carbon footprint. Recommendations for reducing carbon footprint are planting more Red shoots (Syzygium oleana) on school grounds and vertical gardens with a green wall system using several types of plants. The estimated absorption by addition vegetation is 5.83 tonCO2eq/year. The total carbon footprint that can be reduced by school open space is 8.83 tonCO2eq/year.

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Paper ID : 36 Title : Adsorption of Hg(II) from Aqueous Solution by Water Treatment Plant Sludge Author(s) : Monik Kasman, Peppy Herawati, Lucya Handayani Abstract : This research was aimed to observe the adsorption process of Hg(II) from aqueous solution using water treatment plant sludge (WTPS) as adsorbent. The two types of WTP sludge adsorbent, either virgin (WTPA) or activated (WTPB) was investigated in batch experiment by analysing the effect of adsorbent dosage and contact time on the adsorption capacities of WTPA and WTPB. Adsorption isotherm was analysed to get description of the adsorption mechanism and the adsorbent properties. The Langmuir isotherm provided the best correlation with the maximum adsorption capacity was 18.733 mg/g and 17.333 mg/g for respected to WTPA and WTPB. The kinetics studies showed that the Hg(II) for both adsorbents adsorbed rapidly which can be adjusted to the pseudo second order model. Our current study confirmed that WTP sludge was effective adsorbent for the removal of Hg(II) from aqueous solution which followed monolayer and multilayer chemisorption.

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Paper ID : 37 Title : Gate Driver Design with Phase Shift SPWM technique on H-Bridge Multilevel

Inverter topology Author(s) : Venny Yusiana, Hendi Matalata, Syafriyudin Abstract : A converter that converts DC to AC electricity with more than two voltage output levels is known as a multilevel inverter. Eight power switch components(MOSFETs) are used in the 5-Level H-Bridge Multilevel Inverter (CHB-MLI) topology, which is currently being developed. CHB-MLI 5-Level is made up of two full bridge inverters connected in series for each phase. To get positive and negative cycle output from CHB-MLI, a separator is required for each full bridge inverter. The 5-level CHB-MLI uses the PWM (Pulse Width Modulation) technique as a switching technique. This PWM technique, is used as a switch in a power switch component (MOSFET) to determine the harmonics produced by a multilevel inverter. Hence, the harmonics of the 5-level CHB-MLI output voltage were analysed against the switch model using the Sinus Pulse Width Modulation (SPWM) method, and the Phase Shift Sinus Pulse Width Modulation (PSSPWM) method. The results show that the 5-level output voltage harmonics in the PSPWM method are smaller than the SPWM method.

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Paper ID : 38 Title : Use of the OriginPro application for lightning wave spectrum analysis Author(s) : Fadli Eka Yandra, Venny Yusiana Abstract : The spectrum analyser measures the input signal magnitude versus the frequency in the full frequency range of the instrument. Its main use is to measure the spectrum strength of both known and unknown signals. The input signal most commonly measured by spectrum analysers is electricity; however, the spectral composition of other signals, such as acoustic pressure waves and optical light waves, can be considered through the use of suitable transducers. Spectrum analysers for other signal types also exist, such as optical spectrum analysers which use direct optical techniques such as a monochromatic to take measurements. By analysing the electric signal spectrum, the dominant frequency, power, distortion, harmonics, bandwidth, and other spectral components of the signal can be observed which are not easily detected in the time domain waveform. This parameter is useful in characterizing electronic devices, such as wireless transmitters. The spectrum analyser display has the frequency on the horizontal axis and the amplitude displayed on the vertical axis. To the casual observer, a spectrum analyser looks like an oscilloscope, and some laboratory instruments can function as an oscilloscope or spectrum analyser. The lightning wave signal that is detected using a digital oscilloscope is processed with the OriginPro application to obtain the lightning wave pattern that occurs, the spectrum analysis itself uses FFT (fast Fourier transform) calculations.

Paper ID : 39 Title : Physical Characteristic of Polymer Formulations For Prosthetic Foot Materials:

Comparison of Natural Rubber and Ethylene Vinyl Acetate Author(s) : Lilis Kistriyani, Muhammad Kafidh, Donny Suryawan, Rifky Ismail Abstract :

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Prosthetic foot are devices that make the people with disabilities to stand or walk easily. However, currently, prosthetic foot products still have deficiency, including color and material properties that are still far from the expected standard. In this study, several formulations of Natural Rubber (NR) and Ethylene Vinyl Acetate (EVA) were tried. Natural Rubber with a composition of 25 mL, 30 mL, 50 mL, 60 mL, 70 mL and 75 mL mixed with 5% sulfur then vulcanized at 100ᵒC. Ethylene Vinyl Acetate (EVA) with a volume of 80 mL mixed with 25%, 30%, 50%, 60%, 70%, and 75% white cement. Tensile strength analysis, elongation and color observation were obtained from the product. The analysis of tensile strength and elongation were carried out using the ISO 0276: 2009. Based on the results of the tensile strength analysis, the tensile strength value for the composition of NR + sulfur had an increase trend, the value arranged among 10.646 N - 62.13 N. For the composition of EVA + cement, the tensile strength value had a tendency to increase for cement content 25% - 50%, arranged among 40.875 N – 101.37 N, then decreased in cement content 60% - 75%, arranged among 42.51 N – 76.845 N. In the elongation analysis for composition NR + sulfur had a value among 218.555% - 816.333%. For the composition of EVA + cement, the elongation value had a tendency to decrease among 110.022% - 9.799%. The color after vulcanization for NR was light brown and for EVA was light gray.

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Paper ID : 40 Title : Influence of Nanosilica And Crystalline Admixture on The Short-Term Behaviour of

Buried Underground Geopolymer Paste Author(s) : Ar Razi Alvee, Rizka Malinda, Alfie Muna Akbar, Resa Dwi Ashar, Cut Rahmawati,

Sri Mulyaningsih, Lusi Dwi Putri Abstract : Materials with high durability is a sustainable solution to extend a construction life. Geopolymers with nanosilica and Crystalline Admixture (CAs) is more durable than ones without. CAs can clog pores, capillary channels and microcracks, blocking water entry because crystal formation prevents liquid penetration into the geopolymer. This study aimed to investigate the effect of nanosilica and CAs addition on its resistance to the underground environment. The nanosilica and CAs used was 3%, 4%, 5% by the mass of fly ash was used. Visual observation, mass loss, residual compressive strength, and microstructural change were examined after 30 days of burying. It was found that after being buried underground, the nanosilica and CAs showed greater compressive strength than the control geopolymer paste and also lower mass loss. However, nanosilica and CAs did not have a significant effect on capillary water absorption. In the underground environment and the short term, nanosilica and CAs have no significant effect on the compressive strength. Nanosilica and CAs have not been able to maintain the compressive strength. However, compared to the control specimen, the addition of nanosilica and CAs only decreased the compressive strength from 17.40% to 22.31%. While in the control test object, without nanosilica and CAs, the decrease was greater, namely 26.81. XRD analysis showed that no gypsum was found in the specimens added with nanosilica and CAs. This study is beneficial for understanding and future application of nanosilica and CAs geopolymer composites for the underground construction structures.

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Paper ID : 41 Title : Association of Particulate Matter Exposure and Lung Cancer Mortality in the

Workers - A Systematic Review and Meta-Analysis. Author(s) : Sepridawati Siregar, Edo Riyandani, Nora Idiawati Abstract : Lung cancer is the leading cause of male cancer mortality and the second most common cancer for women following breast cancer. Lung cancer is also considered the most common among occupational-related cancers. It happened due to one common risk factor that is exposure to particulate matter, especially PM2.5 (particles with aerodynamic diameter ≤ 2.5 μm). The study aims to perform a critical review, exploration, and robust summary of the relationships between particulate matter exposures and lung cancer mortality in global workers. A comprehensive search was carried out in the bibliographic databases or Medical Subject Headings, including Science Direct, PubMed, and Medline. The search was applied to the articles that were published between 2010 and 2020. The only study provided Hazard ratio estimation further analysed in the quantitative analysis. With strict literature search and screening processes, it yielded 45 articles eligible with the abstract assessment. Six studies were eligible for the full-text requirement, and three were analysed in the meta-analysis. Five prospective cohort study and one case-control study was employed in the meta-regression. The main composition of exposure is a PM2.5 derived from silica and mix substances. Workplace settings vary from construction, Electric Arc Furnace (EAC), hospital, metal mines, and pottery factories. Fixed and random effect models and meta-regression are used to obtain pooled estimates of Hazard Ratio (HR), and P-value functions are used to demonstrate the consistency of results. Forest plot analysis reported I2 = 96%, HR =1.78 [1.74, 1.83], p-value = 0.001. It indicated that the studies are considered homogeneous, and there is supporting evidence that there is an association between particulate matter exposure and lung cancer mortality. The exposure of particulate matter in the workplace (Silica, metal, and combined substances) may be the main factor for the mortality of workers, both male and female.

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