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Journal of Green Science and Technology
Published by Universitas Swadaya Gunung Jati
ISSN : 25981277     EISSN : 26213966     DOI : https://doi.org/10.33603/jgst.v9i1
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Transportation
Journal of Green Science and Technology (JGST) published since 2017 by Faculty of Engineering Universitas Swadaya Gunung Jati Cirebon, Indonesia with p-ISSN 2598-1277 and e-ISSN 2621-3966. JGST publishes twice a year in March and September. Publications before 2023 can be seen here. Journal of Green Science and Technology (JGST) has been accredited by National Journal Accreditation (ARJUNA) Managed by Ministry of Research, Technology, and Higher Education, Republic Indonesia since year 2022 to 2022 according to the decree No. 230/E/KPT/2022. Journal of Green Science and Technology (JGST) accepts and publishes multidisciplinary research and critical review of issues that contains of all scientific works related to the field of following Sciences Engineering: - Civil Engineering - Architectural Engineering - Environmental Engineering - Chemical Engineering - Mechanical Engineering - Electrical Engineering - Industrial Engineering - Informatics Engineering, etc. All manuscripts must be written in English.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 132 Documents
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ANALYSIS OF INFILTRATION WELLS AS PRO-CONSERVATION DRAINAGE (Case Study of Kalongan, Maguwoharjo, Depok, Sleman, Yogyakarta) Lilik Hendro Widaryanto
Journal of Green Science and Technology Vol 6 No 2 (2022): JOURNAL OF GREEN SCIENCE AND TECHNOLOGY VOL.6 NO.2 SEPTEMBER 2022
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v6i2.6946

Abstract

Indonesia has two seasons, namely the dry season and the rainy season where the rainfall in the two seasons has a very large difference. Rainfall in the rainy season will be a source of groundwater reserves, because in the dry season there tends to be no rain. Efforts to increase groundwater reserves are carried out, among others, to use environmentally friendly drainage, namely by using infiltration wells and water will be infiltrated so as to reduce runoff.This research will begin by mapping the land covered by buildings in Kalongan and then calculating the area of land covered by the buildings. Rainfall data used is data at the Maguwoharjo rain station which is close to Kalongan with a span of 10 years. The number of infiltration wells currently available is 8 and by analyzing the needs of infiltration wells it will be known how many infiltration wells are needed so that as much water can be infiltrated to reduce runoff and increase groundwater reserves.The results of the frequency analysis for rainfall with a maximum return period of 5 years as a basis for planning infiltration wells. This large runoff during the rainy season can be reduced by having sufficient infiltration wells, so that rainwater entering the infiltration well will become a source of groundwater reserves. The total requirement for infiltration wells is 464 pieces with a diameter of 80 cm and a depth of 3 m. There are 8 infiltration wells so it is necessary to make 456 infiltration wells to reduce runoff.Keyword: groundwater, infiltration, runoff
DESIGN PROTOTYPE OF SMART DETECTOR ENVIRONMENT SYSTEM ON SEMICONDUCTOR DETECTOR STORAGE (HPGE) Rindi Wulandari
Journal of Green Science and Technology Vol 6 No 2 (2022): JOURNAL OF GREEN SCIENCE AND TECHNOLOGY VOL.6 NO.2 SEPTEMBER 2022
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v6i2.7067

Abstract

The HPGe detector is a device that should be cooled when used and can be operated at room temperature. For this reason, it is necessary to monitor the temperature and humidity in the HPGe detector storage area to produce optimal performance. This research was focused on designing a Smart Detector Environment System as a means of monitoring and automatic control of temperature and humidity in the HPGe detector storage. Temperature and humidity detection in the system was carried out by the DHT22 sensor connected to Arduino Uno and the motor driver module. Arduino uno gave the command "00000011" to detect the temperature in the chamber, and "00000101" to start the detection of humidity in the chamber, then the data generated by the DHT22 sensor would be displayed and processed by LabVIEW, which was used to move the fan to regulate the temperature and humidity in the system with the condition that the lamp on the chamber was left on (manual).  The results obtained were in the form of a design and automatic control of temperature and humidity monitoring and control in the HPGe detector storage whose temperature could be adjusted automatically according to the needs of the HPGe detector.
RURAL LIVELIHOOD TRANSFORMATION AS AN EFFECT OF JATIGEDE DAM DEVELOPMENT IN SUMEDANG WEST JAVA Arni Muslimah Handayani Widjaja
Journal of Green Science and Technology Vol 6 No 2 (2022): JOURNAL OF GREEN SCIENCE AND TECHNOLOGY VOL.6 NO.2 SEPTEMBER 2022
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v6i2.7500

Abstract

Jatigede dam development in Sumedang, West Java, was planned in the 1960s and facing a dynamic revolution in Indonesia’s Governmental System. The political shift causes a change in the government’s priority of development, and as a result, this project had been postponed for decades. In the 1980s, The Government had given land compensation to the rural householder who lives at the site plan. The long-postponed development execution makes rural people unaware to leave the site and continue living on the compensated land for generations. Then in 2012, Government decides to execute the development as a targeted Indonesian Economic Master Plan to boost economic growth. This sudden regulation causes shock and stress for rural people’s livelihood since they should change their way of living in a short time since access to resources became limited by inundation. However, the Dam development unavoidably causes rural transformation that has an impact on rural people’s livelihood. Rural Livelihood transformation can be seen in livelihood assets including natural, financial, physical, human, and social assets condition after the inundation. This paper aims to identify the condition of rural livelihood assets as an impact of rural transformation caused by Jatigede Dam development in Sumedang, West Java. Therefore, the study outcomes were determined as a recommendation for preventing vulnerability by implementing programs for the impacted rural household.
Characterization of Coffee Business Waste in the form of Robusta Coffee Dregs as Adsorbent: A Preliminary Study Sihombing, Rony; Soeswanto, Bambang; Adhitasari, Alfiana; Yusuf, Yusmardhany; Putri, Alifhah Ananda; Fatah, Khalaida Fania; Clarisa, Shintiya; Gunawan, Sinna Chaerunnabila; Leoanggraini, Unung; Muhari, Emma Hermawati; Kurnia, Dianty Rosirda Dewi
Journal of Green Science and Technology Vol 9 No 1 (2025): Journal of Green Science and Technology Vol. 9 No. 1 March 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i1.9104

Abstract

Robusta coffee grounds are widely produced in several types of businesses, one of which is the coffee industry (coffee shop). This pulp can be reused by business people by being used as an adsorbent and paired with the industrial waste. The purpose of this research is to identify the carbon of Robusta coffee grounds between before and after chemical activation. The methods used were sieving, drying at 25°C to 110°C, carbonization at 600°C, immersion in 0.1M HCl solution. Carbonization of Robusta coffee grounds was carried out using BET, FTIR and SEM. The results showed an increase in carbon surface area from 0.588 m2/g to 14.609 m2/g. The results of the FTIR method showed a change in functional groups on several peaks between pre- and post-activation conditions. The results of the SEM method showed an increase in pore size from 5.5 µm (before activation) to 11 µm (after activation). Keywords: Robusta coffee, Coffee grounds, FTIR, Adsorbent
Indicators Analysis of Scope Creep Causation Factors in Indonesian Offshore Oil & Gas Construction Projects Perdana, Adhitya; Wiguna, I Putu Artama
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9181

Abstract

The Indonesian oil and gas (O&G) industry, a strategic sector with vast offshore reserves, faces significant challenges due to the high failure rate of offshore construction projects. This profusion of offshore reserves has led to a rise in offshore O&G construction projects. However, the global failure rate of O&G offshore construction projects is alarming, with numerous projects experiencing delays, budget overruns, and quality issues that hinder the achievement of production targets.  Scope creep, a common phenomenon leading to delays, cost overruns, and quality issues, is a major contributor to these failures. To address this critical problem, this study aims to develop and validate measurement indicators for the causative factors of scope creep in Indonesian offshore O&G construction projects. A quantitative research approach was employed, combining literature review, pilot survey, and a main survey involving 104 practitioners in the industry. Data analysis using SmartPLS 3.0 confirmed the validity, reliability, and outer loading value of measurement indicators. Key findings reveal that risk consequences and awareness are crucial indicators of the risk factor, communication frequency is a key indicator for the communication factor, task overlap and knowledge diversity are identified as key indicators of complexity, construction method changes are a key contributor to the change factor, and accurate identification and structuring of decomposed project tasks are critical indicators for achieving desirable quality in Work Breakdown Structure development. These findings provide valuable insights for industry professionals to mitigate scope creep and improve the success of offshore O&G construction projects in Indonesia. Key words: Scope creep, Project Management, Project Scope Management, Offshore Construction Projects, Oil and Gas.
Surface Flow Analysis as an Efforts Flood Mitigation Tribhuwana, Awliya; Rohman, Fathur; Farhan, Ohan
Journal of Green Science and Technology Vol 8 No 1 (2024): Journal of Green Science and Technology Vol.8 No.1 March 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i1.144

Abstract

Problems that often arise in the city of Cirebon are flooding caused by rain, land changes not supported by adequate infrastructure, narrowing of drainage channels and sedimentation of channels. This is the location where flooding often occurs in the Pemuda Street area and its surroundings. Therefore, it is necessary to carry out research on surface flow analysis as an effort to handle floods with the aim of inundation management strategies to reduce excessive rainwater runoff in drainage areas and channels. The research methods used were problem identification, literature study, data collection, analysis and design planning. The results can show that inundation is handled in two ways, first by changing the dimensions of the channel at the initial height H to 0.45m, it still experiences inundation, this is due to the difference in elevation which causes inundation in the channel. There was a change in the flood inundation area to 23,127 ha from the original 58,958 ha, meaning that the flood free area increased from 9,388 ha to 35,831 ha. The second way is by making 378 infiltration wells spread across 34 channels that experience flooding. With these infiltration wells, the flooding can be reduced to a minimum from an area of ​​23,127 ha to 0.040 ha. The success rate for flood management efforts reached 99.908%, with failure being 0.092%. Of the area of ​​68,346 ha, the flood-free area reached 68,306 ha and the remaining inundated area was 0.040 ha..
Optimizing the Solvent-to-Coffee Ratio for Caffeine Extraction from Arabica Kintamani Coffee Beans using Ethyl Acetate: A Comprehensive Study sihombing, rony
Journal of Green Science and Technology Vol 8 No 1 (2024): Journal of Green Science and Technology Vol.8 No.1 March 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i1.156

Abstract

This paper studies the best ratio of solvent-to-coffee for getting caffeine from Arabica Kintamani coffee beans. It wants to find the optimal ratio that gives the highest caffeine amount and improves the efficiency and quality of extraction. No previous studies have explored the best ratio of Kintamani Arabica coffee beans to ethyl acetate solvent for extracting caffeine. The paper explains the method used, which has four main steps: preparing materials, extracting and measuring caffeine, and analyzing the results. The paper presents the experimental findings and discusses how different ratios affect caffeine content in Arabica Kintamani coffee beans. It uses statistics to show significant differences between the ratios and compares them using Tukey tests. The paper concludes that the best solvent-to-coffee ratio for maximizing caffeine in ethyl acetate extracts is 1:5, resulting in a concentration of 1930.9 ppm. This ratio gives the best balance between caffeine yield and solvent usage.
Factors Causing Time Delays Completion of Construction Projects (Case Study on Facilities Building Construction Project Sports Stage 5 Construction of The East Stand) Arif, Al; Wibowo, Kartono; Sumirin, Sumirin; Ni'am, Moh. Faiqun
Journal of Green Science and Technology Vol 8 No 1 (2024): Journal of Green Science and Technology Vol.8 No.1 March 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i1.128

Abstract

Inaccuracy in planning project activities during project implementation greatly affects implementation delays in the field. The purpose of the study is to determine and analyze: (1) the causal factors that contribute to project completion delays, (2) the causal factors that contribute to the dominant delay in project completion, and (3) delay risk management. In the Sports facilities (Eastern Tribune Development) project. Cirebon Regency. This study is a type of quantitative descriptive study. Data collection was done through FGD, interviews and questionnaires distributed to 10 qualified respondents in the construction sector. The resources of this study are the cause of the delay in the completion of the projects. A House of Risk (HOR) approach was used to analyze the data. Research results show that (1) Cirebon Regency Sports Facilities Building (Eastern Tribune Development) project has 14 risk events and 17 identified risk causes that cause delays. (2) Control factors that cause delays in project completion include: material factors, contract document factors, project owner factors, and contractor and design consultant factors, and (3) delay risk management options, including: (a) good communication and coordination. with the owner; (b) apply a comprehensive planning approach to procurement of materials, (c) coordinate current project drawings between consultants and field workers, (d) contact consultants and supervisors.
Effectiveness of Absorption Wells Using The Sunjoto Method to Control Flooding in The Village of Ngraseh Bojonegoro Mushthofa, Mushthofa; Fadhila, Fajrina Nur; Indriani, Yulia; Faqih, Nasyiin; Qomaruddin, Mochammad
Journal of Green Science and Technology Vol 8 No 1 (2024): Journal of Green Science and Technology Vol.8 No.1 March 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i1.133

Abstract

Infiltration wells are a form of hydrological infrastructure used to manage rainwater. Infiltration wells are usually built as part of a rainwater management system to soak rainwater into the ground and reduce surface waterlogging as well as slow down surface runoff and allow rainwater to seep into the ground to renew aquifers or prevent waterlogging. Maintaining groundwater levels is an important step in sustainable water resource management. The aim of this research is to plan effective infiltration wells to replace rainwater catchment areas lost due to building construction. The planning of this infiltration well uses the Sunjoto  method. From the research results, it was found that an effective infiltration well design was calculated using the Sunjoto  method. With the data, each roof area of ​​the house has an optimum number of infiltration wells with a planned infiltration well diameter of 1 m with a depth of 2.5 m with an effective depth according to the calculations is as follows: 60 m2 number of 1 unit of absorption well with an optimum depth of 2.82 m, 80 m2 number of 2 units of absorption well with an optimum depth of 3.76 m, 100 m2 number of 2 units of absorption well with an optimum depth of 4.7 m, 120 m2 number of 2 units of infiltration wells with an optimum depth of 5.64 m, 140 m2 number of 3 units of absorption wells with an optimum depth of 6.58 m, 160 m2 number of 3 units of absorption wells with an optimum depth of 7.52 m, 180 m2 number of 3 units of absorption wells with an optimum depth of 8.46 m, 200 m2 total of 4 units of infiltration wells with  an  optimum depth  of 9.4 m.
Cost And Time Analysis of Drainage Works Using Conventional Riverstone Method and Precast U-Ditch Method Yulianus Brechmans Dilianto; Galuh, Dimas Langga Chandra; Sutrisno, Widarto
Journal of Green Science and Technology Vol 8 No 1 (2024): Journal of Green Science and Technology Vol.8 No.1 March 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i1.135

Abstract

The aim of this research is to determine the comparison of costs and work time using the conventional river stone method and the precast u-ditch method. So from the two methods mentioned above, we can choose or compare which method can provide benefits in terms of cost and time. This research uses a quantitative method, which explains a process of finding knowledge using data in the form of numbers as a tool for analyzing information about what you want to know in a situation that is the object of study and then analyzed. Comparative analysis of costs and time for drainage channel work using the conventional method with a length of 192 meters takes 55 working days with a cost of Rp 123,617,000.0 while the precast method with a length of 174 meters takes 48 working days with a cost of Rp 78,292,000.0 . The conventional method takes 14% longer to carry out work compared to the precast method. The cost per meter of work using the conventional method is Rp 6,438,385, while work using the method is Rp 4,449,540 with a difference of Rp 1,988,845. The use of precast methods is 30% lower than conventional methods.

Page 8 of 14 | Total Record : 132

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