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Journal of Sustainable Technology and Applied Science
Published by Institut Teknologi Nasional Malang
ISSN : -     EISSN : 27222403     DOI : https://doi.org/10.36040/jstas.v1i2
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Industrial & Manufacturing Engineering
JSTAS (Journal of Sustainable Technology and Applied Science) is the online journal under the Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) ITN Malang. JSTAS ready to publish research articles, a review from the researchers associated with the field of sustainable technology, engineering, and applied science. The journal aims to integrate the study of these disciplines to achieve sustainable development (SD) and help to stimulate debate with a view to defining common, effective responses to tomorrow’s challenges.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 57 Documents
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PHYSICAL, CHEMICAL AND ORGANOLEPTIC CHARACTERISTICS OF CELERY LEAF (APIUM GRAVEOLENS) HERBAL TEA Anggorowati, Dwi Anna; Alpenada, Valerie; Minah, Faidliyah Nilna
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 2 (2023): Journal of Sustainable Technology and Applied Science, November 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i2.5816

Abstract

Celery (Apium Graveolens L.) is one type of herbal plant that is known to have many properties for human health. Despite its abundant availability, it has a relatively short shelf life, which is around 2-3 at room temperature. Celery can be used for the treatment of hypertension, rheumatism, gout, inflammation, appendicitis, typhoid, poisoning, insect bite wounds, cough, prostate, hair fertilizer, oily face, asthma and xerophthalmia. Given the many uses of celery leaves and the relatively short shelf life, this celery will be processed into a form of herbal drink that is ready for consumption. Therefore, this herbal tea will be a solution to extend the shelf life of celery leaves. In this study, celery will be dried using three different techniques: the sunlight method, an oven, and a dehydrator, which also serves as the study's variable. Sunlight drying takes 12 hours, 24 hours, and 48 hours, while oven drying takes 5 hours at 50oC and dehydrator drying takes 1 hour at 50oC. The 14 hours celery withering process is applied for all drying methods. The results of the study will be tested for water content, ash content, antioxidant activity test, flavanoid test and hedonic test. Only 2 methods were found to be in accordance with the INS, namely sun drying for 12 hours and using a dehydrator for 1 hour.
DESIGN OF DATA ACQUISITION FOR THE PRODUCTION AND UTILIZATION OF 500kWP SOLAR POWER PLANT AT CAMPUS-II ITN MALANG USING SCADA HAIWELL SOFTWARE Muljanto, Widodo Pudji; Priyanto, Sugeng; Salam, Muhammad Farhan; Budi Sulistiawati, Irrine
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 1 (2023): Journal of Sustainable Technology and Applied Science, May 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i1.5894

Abstract

Monitoring or data acquisition is defined as monitoring or tracking activities. The existence of a 500Kwp solar power plant at Campus-II ITN Malang in 2021 requires monitoring of its production in real time. So far, data has been collected manually and generally only if further analysis is to be carried out. Data monitoring is observed locally at the monitoring terminal and does not yet provide system-specific data in real time. This research conducts periodic monitoring to determine the production power of a solar power plant in real time, accurately and specifically. The design of the tool consisting of hardware design (Toky DS9L series 3 phase power meter, USR-DR302) and software (Scada Haiwell) is used for online monitoring using the Modbus TCP/IP protocol with RS-485 to Ethernet. This system configuration provides the results of displaying the parameters of current, voltage, power, energy (Kwh) from the production of solar power plants as measured by a power meter and displayed on the Scada Haiwell dashboard.
MAKING LIQUID DISHWASHING SOAP FROM USED COOKING OIL WITH KOH AND NaCl CONCENTRATION VARIATIONS USING SAPONIFICATION PROCESS Setyawati, Harimbi; Anggorowati , Dwi Ana; Yunita , Erni; Angreani, Firda Nur; Fajriyatul , Fresti
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 2 (2023): Journal of Sustainable Technology and Applied Science, November 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i2.5994

Abstract

ABSTRACT. Used cooking oil is cooking oil that has been used repeatedly until the colour changes into dark brown or black. If this substance is immediately disposed of, it will pollute the environment and can reduce soil fertility. Used cooking oil as used cooking oil can be reprocessed into raw materials for non-food industries, such as biodiesel, candles, and soap. This study aims to obtain optimal variables of KOH concentration and NaCl concentration in the saponification process of making liquid dish soap from used cooking oil. The variables used in this study consisted of a fixed variable, namely the amount of used cooking oil, and the changing variables were variations in the concentration of KOH (10%, 20%, 30%, 40%, 50%) and variations in the concentration of NaCl (24%, 27%, 30 %). The research was conducted at the Microbiology Laboratory of ITN Malang. The analysis showed that the highest percentage decrease in water content reached 8.4%, free fatty acids 1.03% at 50% KOH concentration and 30% NaCl concentration. The highest percentage increase in viscosity is called 2214.25 cps, 0.15% free alkali, 1.88% high foam, and pH 11.2 at 50% KOH concentration and 30% NaCl concentration. From the study results, it can be concluded that the saponification process with variations in the concentration of KOH and NaCl used in making liquid soap affects the characteristics of the liquid soap produced.
STRATEGY OF OPERATIONAL RISK MANAGEMENT AT PT XYZ Mambuhu, Eko; Achmadi, Fuad; Nursanti, Ellysa
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 2 (2023): Journal of Sustainable Technology and Applied Science, November 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i2.6242

Abstract

In the context of an organisation/company or business, operational scope is very important, including all risks. PT XYZ continues to demonstrate performance metrics with a compliance rate of less than 100% in the conduct of its business and is considered a risk in the Company's operational framework. Therefore, the purpose of this research is to propose improvement or control solutions to reduce operational risk and recommend the risk management ISO 31000 version of treatment. In principle, 2 (two) calculation steps were performed in this study, namely before and after providing repair solutions. The methods used are Failure Modes and Effects Analysis (FMEA) and risk matrix, Pareto charts are used to rank risks from highest to lowest, and fishbone diagrams to analyze repair solutions. As a result, the total risk score becomes R8 = 2.40 to 1.60, followed by a decrease from R2 = 0.96 to 0.16, R1 = 0.36 to 0.24, R6 = 0.108 to 0.03, R7 = 0.108 to 0.03, R4 = 0.096 to 0.02, R3 = 0.06 to 0.02 and R5 = 0.036 to 0.02. From the categorization of the risk matrix there is then also a decrease in impact which originally had 5 (five) low risk categories to 6 (six) risks, then 1 (one) medium risk and the remaining 1 (one) extreme risk. In accordance with ISO 31000:2018 risk management recommendations that risk before control, namely accepting risk is applied to 5 (five) risks, risk mitigation is applied to 1 (one) risk, avoiding risk is applied to 2 (two) risks. Risk after control, namely accepting risk is applied to 6 (six) risks, risk mitigation is applied to 1 (one) risk and risk avoidance is applied to 1 (one) risk.
AN ANALYSIS OF THE EFFECTS OF PERFORMANCE ON COMMUNITY SATISFACTION BASED ON CUSTOMER VOICE (CASE STUDY IN COOPERATIVE OFFICES, SMES, INDUSTRY AND TRADE, CENTRAL SUMBA DISTRICT) Sabakula, Abner Umbu Laiya; Achmadi, Fuad; Laksmana, Dimas Indra
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 2 (2023): Journal of Sustainable Technology and Applied Science, November 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i2.6596

Abstract

To prepare civil servants who are professional, capable of competing, and capable of anticipating rapid world developments in various aspects of life, in order to improve service quality and awareness of the need for quality human resources, various strategies that can improve employee performance must be implemented. One strategy is to provide additional employee income as a form of motivation (TPP). The goal of this study is to assess community satisfaction with the performance of the Central Sumba Regency's cooperative, SME, industry, and trade departments using Voice of Customer data. The research method employs questionnaires to assess customer satisfaction with the PDCA approach, as well as service quality and IPA analysis. The findings of this study indicate that people are dissatisfied with the performance of employees and that changes must be made. The final results obtained after using the PDCA approach and analysis using servqual and Importance Performance Analysis (IPA) are performance factors that are priority improvements and performance that must be maintained in order to meet community satisfaction. Keywords: voice of costumer, PDCA, service quality, IPA
DEVELOPMENT OF A PERFORMANCE-BASED INCENTIVE MODEL FOR NATIONAL HIGH SCHOOL MALANG TEACHERS AFTER THE COVID-19 PANDEMIC Shanti Dri Lestari; Hutabarat, Julianus; Handoko, Fourry
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 5 No. 1 (2024): Journal of Sustainable Technology and Applied Science, May 2024
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v5i1.6703

Abstract

National High School Malang is one of the best private schools with a myriad of achievements. In 2019, National High SchoolMalang was honored as one of Indonesia's best private schools by the Minister of Education and Culture. National High School Malang is one of the private schools in Malang City that has also been affected by the Covid-19 pandemic. The Covid-19 pandemic has not really ended and life must go on. The Covid-19 pandemic has indirectly changed labor patterns both in the scope of government, agencies, private sector, and others. This research aims to design a model for determining the criteria for providing performance-based incentives to teachers at National High SchoolMalang to improve service quality after the Covid-19 pandemic. In this study, the calculation results are used to determine the amount of incentive proposals that will be obtained by each teacher by taking into account the results of the performance assessment. Based on the results of the calculation of the proposed incentives, it can be concluded that there was an increase in the average incentive for each teacher by 35%. This shows that with an increase in incentives it is expected that there will be an increase in the value of work performance. And in line with the results of the calculation of the proposed incentive increase, it was found that there was also an increase in work performance of 51%. With this, it can be concluded that the provision of incentives has a major effect on increasing work performance.
ANALYSIS OF STUDENT SERVICE QUALITY WITH SERVQUAL METHOD, QFD, AND CONTINUOUS IMPROVEMENT Susanto, Andri; Nursanti, Ellysa; Vitasari, Prima
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 5 No. 2 (2024): Journal of Sustainable Technology and Applied Science, November 2024
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v5i2.7130

Abstract

Sekolah Tinggi Teknik (STT) Malang is one of College in Malang City. Service quality problems that students complain about include academic services, wi-fi facilities, and facility issues. This study aims to determine the current student service mapping with the SERVQUAL method, applicative suggestions based on the QFD method, and service improvements based on continuous improvement methods. The research was conducted by distributing questionnaires randomly to 250 students. The results showed that the attributes of adequate motorcycle parking space, wifi/internet facilities, the ease of students submitting academic complaints, and the ease of submitting complaints on facilities were the main priorities for improvement. The main priority for improvement is educational services, such as providing face-to-face facilities and online media for submitting academic complaints.
PROJECT MANAGER LEADERSHIP STYLE WHICH INCREASES THE PROJECT PERFORMANCE Lukiyanto, Kukuh
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 1 (2023): Journal of Sustainable Technology and Applied Science, May 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i1.7282

Abstract

Maximum performance to achieve the specified target is the expectation of each project work. Leadership is one of the factors causing the achievement of good project performance. The purpose of this study is to find out what kind of project manager leadership style can improve the performance of all elements in the road project. This study uses qualitative methods to study the impact of leadership style on the success of road construction projects. Taking the object of research in East Java with 15 informants, in-depth interviews and observations were carried out for 6 months. Based on the analysis of the data obtained, a guiding leadership style, and open to discussion, can improve the performance of road construction projects.
OPTIMIZING BRIQUETTE CHARACTERISTICS BASED ON THE RATIO OF BAMBOO AND COCONUT FIBER UNDER CONVENTIONAL METHOD Anggorowati, Dwi Anna; A.S., Mardhiyah; N., Rizky; K., Ido; Adam Yonanda; Jamilulchal , M
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 5 No. 1 (2024): Journal of Sustainable Technology and Applied Science, May 2024
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v5i1.8015

Abstract

This study aims to optimize the potential of biobriquettes produced from a mixture of bamboo and coconut fiber using starch adhesive. The focus of the research includes determining the composition ratio of bamboo and coconut fiber that gives the best results, as well as the physicochemical characteristics of the briquettes, including moisture content, volatile matter, ash content, and calorific value. In the carbonization process, bamboo is processed for 5 hours, while coconut fiber is processed for 2 hours, with an operating temperature of 140°C. This study considered variations in the ratio of bamboo and coconut fiber mixture, such as 1:1, 5:1, and 9:1. Starch adhesive was used in a concentration of 25% of the total mixture as a determining factor in the formation of biobriquettes. The results showed that the bamboo:coconut fiber mixture ratio of 5:1 gave the best biobriquette characteristics. These briquettes have low moisture content, optimal volatile matter, standard ash content, and high calorific value of 5679.15 cal/gram. Carbonization at 140°C positively influenced the physicochemical properties of the biobriquettes.
POWER SYSTEM RELIABILITY ANALYSIS FOR DIFFERENT LINE OUTAGE CONDITIONS Akanksha Priya; Sujit Pani; Dipu Sarkar; Lomi, Abraham
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 3 No. 2 (2022): Journal of Sustainable Technology and Applied Science, November 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v3i2.8077

Abstract

Power System Reliability Assessment is a crucial and significant feature of power system design, planning, and operation. A power system comprises many components that are interconnected in meaningful and rational ways. In the present paper, a simulation is carried out for line outage conditions. In a power system, some of the lines are extremely important. If such a line outage is happening then a cascading failure may occur. This failure leads to grid collapse. So, a power engineer needs to know which line will be more important. In the present work, reliability was done for different line outage conditions to check the importance of the line. This report defines a transmission network, generation system, and load model that can be used to compare the power system of reliability assessment methods. The objective is to estimate the reliability index for improvement of power system reliability analysis for different line outage conditions. The improvement in reliability assessment was evaluated with a reliability index that includes ACCI (Average Customer Curtailment Index), AENS (Average Energy Not Supplied), ASAI (Average Service Availability Index), ASUI (Average Service Unavailability Index), CAIDI (Customer Average Interruption Duration Index), CTAIDI (Customer Total Average Interruption Duration Index), EENS (Expected Energy Not Supplied), SAIDI (System Average Interruption Duration Index), and SAIFI (System Average Interruption Frequency Index) for different line-outage conditions using Electrical Transient Analyzer Program (ETAP) software. The transmission system comprises 24 load/generation buses that are connected by 38 switches or transformers with two voltages that is, 138 KV and 230 KV. Transmission system data consists of line, transformer, impedance, and reliability data.

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