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INDONESIA
Jurnal Sains dan Teknologi
Published by CV ITTC Indonesia
ISSN : -     EISSN : 28077393     DOI : 10.47233
Core Subject : Science, Education, Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering
Jurnal Sains Dan Teknologi (JSIT), merupakan Jurnal Penelitian dan Kajian Ilmiah yang diterbitkan CV.ITTC - INDONESIA dan dikelola langsung oleh Webinar.Gratis dan Even.Gratis yang terbit 3 (tiga) kali dalam setahun. Penyunting menerima kiriman naskah hasil kajian dan penelitian untuk bidang, Teknik Elektro, Teknik Sipil, Teknik Mesin, ,Teknologi Informasi.
Arjuna Subject : Umum - Umum
Articles 6 Documents
 1 
Search results for , issue "Vol. 6 No. 2 (2026): Mei - Agustus" : 6 Documents clear
Pengaruh Pengunaan Abu Ampas Kopi sebagai Bahan Subtitusi Semen pada Beton Pori Saputra, Yusaq Bahyu; Rochmah, Nurul
Jurnal Sains dan Teknologi (JSIT) Vol. 6 No. 2 (2026): Mei - Agustus
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jsit.v6i2.4633

Abstract

Pervious concrete is a material with open voids that allow water to flow through, making it highly effective in reducing surface runoff and increasing groundwater infiltration in urban areas. Pervious concrete, also known as porous concrete, is an innovative material designed with open pores that allow water to pass through its structure, making it a potential solution for mitigating surface runoff and enhancing groundwater infiltration in urban areas. This study focuses on the sustainable utilization of coffee waste by using coffee grounds ash as a cement substitute in environmentally friendly pervious concrete. In addition to producing environmentally friendly concrete, this study also provides an effective alternative for reducing organic waste. The study aims to analyze the effect of using coffee grounds ash as a partial cement replacement on the compressive strength of concrete, while simultaneously providing an innovative solution for the utilization of coffee waste by incorporating coffee grounds ash as a cement substitute in pervious concrete, specifically at cement replacement levels of 0%, 2,5%, 5%, and 7,5%. The concrete mix design was prepared according to the ACI 522R-10 method. Test results indicated that the 0% and 2,5% replacement levels produced a compressive strength of 5,91 MPa, while the 5% and 7,5% levels produced 4.43 MPa at 7 days, demonstrating that lower replacement levels provide higher compressive strength compared to higher replacement levels.
Rancang Bangun Pembangkit Listrik Termoelektrik dengan Menggunakan Limbah Tongkol Jagung Aldiansyah, Satria; Djohar, Abdul; ., Asminar
Jurnal Sains dan Teknologi (JSIT) Vol. 6 No. 2 (2026): Mei - Agustus
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jsit.v6i2.4644

Abstract

The large amount of corn cob waste that has not been optimally utilized is one of the challenges in the agricultural sector, although this waste has the potential to become an economically valuable and environmentally friendly biomass energy source. The increasing demand for electricity, which is not matched by fossil fuel availability, is also encouraging the development of sustainable alternative energy sources, especially those derived from local agricultural waste. Therefore, this study aims to design and analyze the performance of a thermoelectric power plant utilizing corn cob waste to meet daily electricity needs and evaluate its potential as a small-scale alternative energy source. The methods used include prototype design, system assembly using Peltier modules arranged in series-parallel, a biomass combustion system, a water-circulation cooling system, and testing based on voltage, current, power, and temperature difference (ΔT) parameters. Test data were collected periodically during combustion to determine the system output characteristics. The results show that the use of 9 Peltier modules with 2 kg of corn cobs as fuel produces a maximum power of 8.192 W with a current of 0.64 A under the highest temperature difference conditions. The prototype test results were then used as the basis for a simulation to estimate system development, where an output energy of 1040 Wh requires 16 combinations or 144 Peltier units operating for 8 hours using approximately 16 kilograms of corn cobs as fuel.
Pengaruh Pemanfaatan Limbah Batu Onyx sebagai Subtitusi Agregat Kasar Terhadap Beton Porus Utomo, Rendy Cahyo; Rochmah, Nurul
Jurnal Sains dan Teknologi (JSIT) Vol. 6 No. 2 (2026): Mei - Agustus
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jsit.v6i2.4650

Abstract

Conventional concrete, which is impermeable in nature, can increase surface runoff and cause water ponding problems. Therefore, an alternative construction material that supports better drainage systems is required. One potential solution is porous concrete utilizing waste onyx stone as a partial replacement for coarse aggregate.This study aims to analyze the effect of using waste onyx stone as a substitute for coarse aggregate on the compressive strength and permeability of porous concrete.The research method used was a laboratory experimental method with variations of waste onyx stone substitution of 0%, 50%, 75%, and 100% of the total coarse aggregate. The tests conducted included material characteristic testing, compressive strength testing at 7 and 28 days, and permeability testing of porous concrete.The results showed that the use of waste onyx stone affected the compressive strength and permeability of porous concrete. At 7 days, the 0% variation produced the highest compressive strength of 5.91 MPa, while the 100% variation produced the lowest value of 4.25 MPa. At 28 days, the highest compressive strength was obtained in the 0% variation at 10.35 MPa, while the lowest was in the 100% variation at 4.62 MPa. The permeability test results showed an increase from 0.36 cm/s in the 0% variation to 0.60 cm/s in the 100% variation. The higher the substitution of waste onyx stone, the higher the permeability value, while the compressive strength tended to decrease.
Analisis Manajemen Risiko pada Pelaksanaan Proyek Peningkatan Jalan Rigid Pavement Ruas Wadungasri – Tambaksawah Hamzah, M. Luthfi; Triana, Masca Indra
Jurnal Sains dan Teknologi (JSIT) Vol. 6 No. 2 (2026): Mei - Agustus
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jsit.v6i2.4654

Abstract

Road construction projects are an important part of infrastructure development and involve various risks during their implementation. Poor risk management may lead to project delays, cost overruns, decreased work quality, and disruption of project performance. Therefore, risk management analysis is required to identify and evaluate the risks that may occur during project execution. This study aims to analyze risk management in the implementation of the rigid pavement road improvement project on the Wadungasri – Tambaksawah section. The study employed a quantitative approach through questionnaire distribution to 30 respondents directly involved in the project implementation. Data analysis was conducted using the Severity Index (SI) method by combining probability and impact values to determine the risk level of each variable. The results indicate that 7 risk variables were classified into the high-risk category (43.75%), namely delays in equipment and material mobilization, low work productivity and efficiency, equipment damage in the field, delays in project progress, ineffective traffic management, ineffective work methods, and limited access to materials and equipment. Meanwhile, 9 other variables were categorized as medium risk, and no variables were classified as low risk. Based on the Severity Index ranking, several operational-related risk variables showed higher risk levels compared to other variables. Risk response strategies were mainly focused on mitigation efforts, including preventive equipment maintenance, improvement of material mobilization planning, periodic project progress monitoring, optimization of work methods, and traffic management around the construction area. Proper risk management is expected to improve project performance and support the achievement of project objectives effectively.
Penerapan Belbin Team Role dalam Mengatasi Ketidaksinkronan Tujuan Tim Pemasaran PT XYZ Nurmiati, Evy; Shufa, Aliya Nabila; A, Alif Salsabila; Nurzahra, Bevy Annisa; Fauzan, Rizki
Jurnal Sains dan Teknologi (JSIT) Vol. 6 No. 2 (2026): Mei - Agustus
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jsit.v6i2.4655

Abstract

The fast-moving consumer goods (FMCG) sector in Indonesia is experiencing a shift in competitive dynamics, characterized by the impact of digital disruption and evolving consumer behaviors. This scenario necessitates the establishment of a collaborative environment within the marketing team, particularly during the initiation of new product launches. However, in practice, functional conflicts often arise due to a lack of alignment in perceptions of objectives and ambiguity in roles between the Graphic Design Team, which is oriented towards visual creativity, and the Data Analyst Team, which emphasizes data-based validation. These conflicts frequently impede effective decision-making processes and diminish the team's overall performance. The objective of this study is to examine the efficacy of implementing the Belbin Team Role Model as a diagnostic instrument and behavioral intervention to address role conflicts and align perceptions of work objectives within the Marketing Team at PT XYZ.The present study employed a qualitative approach, utilizing an exploratory case study design. The subjects of the research study comprised eight individuals from the Marketing Team at PT XYZ. The data collection techniques employed in this study included the Belbin Self-Perception Inventory (SPI), observational assessments, and in-depth interviews conducted prior to and following the intervention. The data were then subjected to thematic analysis, a method of data interpretation that seeks to identify patterns of conflict, role clarity, and changes in teamwork dynamics. The results of the study indicate an imbalance in the composition of team roles, characterized by the dominance of Plant and Shaper roles and the absence of Monitor Evaluator roles. This imbalance has been shown to trigger conflict between creative and analytical orientations. The application of the Belbin Model has proven effective in providing a neutral role language, increasing role clarity, and transforming dysfunctional conflict into constructive discussion. This intervention has been demonstrated to facilitate the alignment of perceptions regarding team objectives by integrating visual creativity and data validation in a more balanced manner.
Pengaruh Penggunaan Abu Kayu Jati sebagai Subtitusi Semen pada Beton Pori Kusuma, Priba Dwi; Rochmah, Nurul
Jurnal Sains dan Teknologi (JSIT) Vol. 6 No. 2 (2026): Mei - Agustus
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

His study aims to analyze in depth the effect of teak wood ash substitution as a partial replacement for cement on the compressive strength of porous concrete. Teak wood ash was selected as an alternative material because, in addition to being abundantly available as wood waste, it also has the potential to reduce cement consumption, thereby contributing to lower carbon emissions and reduced concrete production costs. This research employed a systematic laboratory experimental method with teak wood ash substitution variations of 0%, 1%, 2%, 3%, and 5% by weight of cement. Each mixture was carefully tested to determine its effect on the compressive strength of porous concrete at 28 days of curing age, in accordance with applicable concrete testing standards. The test results showed that porous concrete without teak wood ash substitution produced the highest compressive strength of 8.32 MPa. Meanwhile, the compressive strength values for substitutions of 1%, 2%, 3%, and 5% were 6.84 MPa, 7.39 MPa, 6.84 MPa, and 5.73 MPa, respectively. These results indicate that the addition of teak wood ash tends to reduce the compressive strength of porous concrete; however, the 2% substitution variation showed the best performance among all variations. The decrease in compressive strength at higher substitution levels is presumed to occur due to the reduction in cement as the main binding material and the increase in air voids within the concrete, resulting in a less dense concrete structure. Therefore, a 2% teak wood ash substitution can be considered the optimum level for producing porous concrete that still possesses adequate strength while being more environmentally friendly and cost-effective.

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