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SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi
Published by Universitas Sarjanawiyata Tamansiswa
ISSN : 24606286     EISSN : 25793624     DOI : 10.30738/science tech.v2i1.396
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Engineering Materials Science & Nanotechnology
Jurnal SCIENCE TECH adalah jurnal yang diterbitkan oleh Lembaga Penelitian dan Pengabdian kepada Masyarakat (LP2M) Universitas Sarjanawiyata Tamansiswa (UST) Yogyakarta. Jurnal ini diharapkan sebagai media bagi dosen, peneliti, praktisi, mahasiswa dan masyarakat luas yang memiliki perhatian terhadap bidang dan perkembangan ilnu pengetahuan dan teknologi. Jurnal SCIENCE TECH terbit dua kali setahun yaitu Januari dan Agustus, setiap terbit 8 artikel.
Arjuna Subject : Umum - Umum
Articles 141 Documents
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Perbandingan Proses Sterilisasi Kalsium Karbonat (CaCO3) sebagai Bahan Baku Probiotik Hewan Berdasarkan Jumlah Total Sel Bakteri Henny Parida Hutapea; Febriyanny Eka Setyowati
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 1 (2023): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no1.a14164

Abstract

Calcium carbonate (CaCO3) is known as an inexpensive inorganic mineral commercially. Currently, calcium carbonate is widely used as a carrier for animal probiotics. As a carrier material, the use of calcium carbonate must be free from bacterial contamination. This is so that the probiotics production also do not contain bacteria other than the probiotics themselves. The method used was descriptive quantitative method. This study focused on examining the effectiveness of the calcium carbonate sterilization process with the dry sterilization process using an oven and the wet sterilization process using an autoclave based on the total plate count of bacteria. Based on the research, the normal treatment or without sterilization, Total Plate Count (TPC) calcium carbonate results were < 2.2 x 103 cfu/mL, in the wet sterilization treatment using an autoclave the total plate count was < 1.1 x 103 cfu/mL and the results in the sterilization treatment dry using an oven the total plate count was 0 colonies. The dry sterilization method using an oven is more suitable for calcium carbonate sterilization than the wet sterilization method using an autoclave. In the water content test, the same results were obtained for the three calcium carbonate treatments. This indicates that the dry and wet sterilization methods for calcium carbonate did not affect the percentage of water content contained therein. In the pathogen test, negative results were obtained for Escherichia coli and Salmonella sp in all three treatments.
Implementasi Web Scraping pada Google Cendekia sebagai Sarana Profiling Penelitian Dosen Muhammad Koprawi; Wahyu Sukestyastama Putra
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 1 (2023): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no1.a14188

Abstract

Google Scholar is an online platform that provides access to scholarly literature such as articles, theses, books and conference proceedings from various scientific publishers. As educators or lecturers, they should have scientific research works that can be accessed by anyone at any time. To measure achievement and access to publication of scientific papers quickly and to profiling educators, lecturers or researchers, universities must have a centralized database that comes from a Google Scholar account and can be updated periodically or automatically based on a specified period. To solve this problem, the researcher implements a web scraping technique combined with a cron job as a command that will run a task on a scheduled basis. The method used is the RAD (Rapid Application Development) method which focuses on a fast system development process. This study succeeded in scraping data for 2983 documents, displaying document citation data globally and successfully carrying out an automatic scheduling synchronization process that is set with scheduling configurations every week, every month, every quarter, every semester and every year, and scripts on cron jobs are run every 5 minutes on the server to check if any scheduling is active.
Analisis Penggunaan Variasi CDI dengan Variasi Bahan Bakar terhadap Daya dan Torsi Motor Bensin 1 Silinder Rizky Yusuf Efendi; Nurcholish Arifin Handoyono; Samsul Hadi
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 2 (2023): Agustus: Article In Progres
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no2.a14744

Abstract

This research aims to determine the ratio of power and torque produced by motorcycle engines using CDI variations with various fuels. The type of research used is descriptive quantitative. Data collection techniques using tests, namely by testing the object under study then measuring and recording directly the resulting data. The testing process uses the help of a dynamometer measuring instrument. Data collection was carried out at 6000 to 11000 rpm rotation. The results showed that the power and torque produced using standard CDI DC on pertalite fuel showed the lowest value with a maximum power of 22.5 HP at 9168 rpm and a maximum torque of 19.78 Nm at 6576 rpm, on Pertamax 92 fuel the maximum power was 22, 6 HP at 8370 rpm, with a maximum torque of 19.99 Nm at 7246 rpm and the Pertamax 98 fuel shows the highest value with a maximum power of 23.2 HP at 8931 rpm and a maximum torque of 20.16 Nm at 7345 rpm. For the power and torque generated by the use of CDI DC racing BRT on pertalite fuel, it shows the lowest value with a maximum power of 22.9 HP at 8604 rpm and a maximum torque of 19.43 Nm at 7670 rpm, on Pertamax 92 fuel the maximum power is 23, 6 HP at 8979 rpm, with a maximum torque of 19.81 Nm at 7552 rpm and the Pertamax 98 fuel shows the highest value with a maximum power of 23.8 HP at 9156 rpm and a maximum torque of 20.36 Nm at 7458 rpm. The use of CDI DC racing BRT is able to serve engine performance at higher rpm rotations and produce greater power and torque for each type of fuel variation.
Pengaruh Penambahan Zat Epoxy Resin dan Polypropylene Fiber Mesh (PFM) Terhadap Kuat Lentur Beton Samuel Huaso Hatongamon Sianturi; Lolom Evalita Hutabarat; Setiyadi
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 2 (2023): Agustus: Article In Progres
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no2.a14784

Abstract

Polypropylene fiber is made from chemical hydrocarbon compounds (C3H6) in single filaments or thin fibrous networks. Because the plastic fibers of polypropylene fiber mesh function as anti-cracking and reduce the brittle properties of concrete, a mixture of PFM and epoxy resin can increase the compressive strength and flexibility of concrete referred to ACI Committee 544. The polypropylene fiber additions used in this study were 0.60 kg/m3, 0.70 kg/m3, and 0.80 kg/m3, with an addition of 8% epoxy resin. Sixteen blocks (15 cm x 15 cm x 60 cm) with a design compressive strength of f'c 25MPa and a water-cement factor of 0.61. SNI 7656-2012 is referred to in the test standard. Compression and flexure tests were performed at 14 and 28 days of age. With the addition of 0.7 kg/m3 polypropylene fiber mesh, the compressive strength increased by 9.56% at 14 days of concrete age to 27.39 MPa. Meanwhile, at 28 days, it had risen by 20% or 30 MPa. Furthermore, for 14 days, the bending moment was 11943766.2 N.mm, and for 28 days, it was 13246692.5 N.mm.
Analisis Peningkatan Ketahanan Sobek pada Karton Ivory Laminasi Doff dan Laminasi Glossy Septia Ardiani; Meuthia Suryani; Nurul Akmalia
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 2 (2023): Agustus: Article In Progres
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no2.a15209

Abstract

One of the commonly used food packaging materials is cardboard. Cardboard was chosen because it has several advantages including light weight, inexpensive, easy to form, easy to print, easy to store and easy to recycle. However, it tears more easily than other packaging materials such as plastic, cans, and glass. Lamination is done to increase the ketahanan sobek value. The type of folding cardboard that is commonly used as a food packaging material is ivory. In this test, the density of ivory is 260 gsm and 310 gsm. There were three types of ivory tested, namely non-laminated, doff laminated, and glossy laminated. This study aims to analyze the comparison of ketahanan sobek values of laminated ivory and non-laminated. The methods used in testing are ISO 534:2011, ISO 536:2010, and ISO 1974:2012. The results showed that the increase in the ketahanan sobek value of cardboard was 22% -24% for doff lamination and 24% -26% for glossy lamination.
Penyiraman Tanaman Otomatis pada Tanaman Cabai Rawit dengan Metode Simple Additive Weighting Nisa'ul Nurfajri Arofah; Fikra Titan Syifa; Indah Permatasari
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 2 (2023): Agustus: Article In Progres
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no2.a15217

Abstract

Conventional watering of plants requires more time and effort to do so. Often plant owners forget to water the plants which can cause the plants to die. Sometimes the amount of water that is sprinkled does not match the water needed by the plants. From these problems, the author will create an IoT-based automatic plant watering system using the SAW (Simple Additive Weighting) method. In this study the authors used capsicum frutescens, Node MCUESP8266 as a microcontroller, soil moisture capacitive as a soil moisture sensor, and DHT11 as a temperature sensor. The results showed that the system can water the plants automatically with a capacitive soil moisture sensor reading accuracy of 96.63% and a DHT11 sensor reading of 98.98%. Besides that, based on the application of the SAW method in making decisions for plants that have the most right to be watered, namely conditions that have a final result of more than or equal to 36.
Desain Antena Mikrostrip Rectangular Frekuensi 3,5 GHz Menggunakan Metode Slits Shinta Romadhona; M. Panji Kusuma Praja; Raditya Artha Rochmanto
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 9 No 2 (2023): Agustus: Article In Progres
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol9.no2.a15581

Abstract

In the frequency spectrum of 5G technology, there are three sub-frequencies, namely low band, midband, and high band. For the midband frequency, such as 3.5 GHz, it requires high data speed and wide coverage to support Enhanced Mobile Broadband (eMBB) services with high quality. Therefore, antennas are needed to meet the transmitter and receiver requirements for the 3.5 GHz operating frequency. An antenna with small dimensions is necessary to be used in limited spaces, thus a rectangular microstrip antenna with slit method is designed. For this research, it is limited to simulations using HFSS 15 to find the maximum possible optimization values by adjusting patch dimensions, substrate, and strip line. The return loss result at the operating frequency of 3.5 GHz is -20.0202 dB, and the VSWR is 1.2216. The final step is to add the slit method, which aims to improve the return loss, VSWR, and reduce the antenna dimensions. The optimization result with the slit method is achieved with a patch width of 25.43 mm and a patch length of 19.67 mm. The VSWR value decreases by 0.0701, indicating improved performance. The magnitude gain of the antenna is 3.8253 dB at a theta angle of 360 degrees.
Peran Internet of Things (IoT) dalam Mengoptimalkan Rantai Pasok E-commerce: Systematic Literature Review Putri, Anggun Cynthia; Nasihin, Muhamad
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 11 No 1 (2025): Februari: In Press
Publisher : Universitas Sarjanawiyata Tamansiswa

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

Abstract

This study identifies and analyzes the role of the Internet of Things (IoT) in optimizing the supply chain in the e-commerce sector through a Systematic Literature Review approach. By evaluating the literature from 2020 to 2024, this study shows that IoT can improve operational efficiency, transparency, and automation in supply chain management. Key findings reveal that IoT technology can reduce reliance on inefficient manual processes, allowing companies to monitor the condition of goods and logistics status in real-time. This contributes to faster decision-making and improved customer satisfaction. However, the research also found challenges in implementing IoT, such as the complexity of system integration, high initial investment requirements, and data security and privacy issues. Therefore, companies need to plan a well-thought-out strategy to overcome these obstacles. This research emphasizes the importance of collaboration between stakeholders to create an ecosystem that supports IoT adoption. Overall, this research provides valuable insights into the potential and challenges of IoT adoption, and recommends further research to ensure competitiveness in the digital age.
Penerapan Analisis Space Syntax pada Peningkatan Mitigasi Banjir Jakarta Stepanus Andi Saputa
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 11 No 2 (2025): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol11.no2.a17897

Abstract

Flooding is an annual issue that continues to threaten the Special Capital Region of Jakarta, with significant impacts on infrastructure and the lives of its residents. Approximately 70% of Jakarta's area has been submerged during major floods, disrupting inter-regional access, causing casualties, and resulting in substantial economic losses. One of the primary causes of flooding is the growth of illegal settlements along riverbanks due to poorly organized spatial planning, leading to river narrowing and increased risk of overflow during heavy rainfall. Areas like Kampung Melayu along the Ciliwung River are particularly prone to annual flooding. The Provincial Government of the Special Capital Region of Jakarta has undertaken various mitigation programs, including river normalization, river naturalization, and the construction of infiltration wells. However, implementing these programs has often been suboptimal, with shifting policy priorities depending on leadership changes. Additionally, limited attention has been given to the road network as part of flood disaster mitigation, despite its crucial role in supporting evacuation and mobility during emergencies. This study aims to evaluate the vulnerability of road networks using the space syntax theory, which provides an in-depth analysis of spatial relationships. The method employed involves axial map analysis using Depthmap software to map spatial connections and the integration levels of road networks. The study compares the performance of road networks under normal conditions and during flooding. It also examines the performance of bridges and inter-regional connecting routes. The research focuses on areas along the Ciliwung River, particularly Kampung Melayu, covering a 3 km radius, one of 69 flood-affected regions. The study's findings are expected to provide strategic recommendations to improve the overall performance of road infrastructure, thereby enhancing the effectiveness and sustainability of flood mitigation efforts.
Customer Satisfaction Mapping of Hot Mix Asphalt Products Using Importance-Performance Analysis Mantolas, Herlina; Kurniawan, V. Reza Bayu; Ma'arif, Syamsul; Quế-Nhu, Dương
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 11 No 2 (2025): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol11.no2.a19185

Abstract

The construction industry, particularly road construction, supports economic growth and enhances community mobility. One of the primary challenges is ensuring that the quality of hot mix asphalt (HMA), a critical component in road construction, aligns with customer needs and expectations. This study aims to evaluate customer satisfaction with HMA products produced by PT. SKS in Yogyakarta. The Importance-Performance Analysis (IPA) approach was employed to identify gaps between the product's actual performance and the importance level expected by customers. Data were collected from 25 respondents using a Likert-scale questionnaire covering 20 service attributes, including guest facilities, product services, and quality control. The data were analyzed using a Cartesian diagram to map attributes into four priority quadrants. The findings revealed that the average performance score (3.93) was slightly lower than the average importance score (4.13), indicating gaps in several attributes. Attributes such as the availability of project safety shoes (Q8) and accessibility (Q9) fell into Quadrant A, requiring immediate improvement. Meanwhile, attributes like product quality (Q14) and delivery reliability (Q12) in Quadrant B must be maintained. This study concludes that enhancing the priority attributes in Quadrant A can significantly improve customer satisfaction. The findings provide strategic recommendations for the company to enhance efficiency, improve product quality, and meet customer expectations.

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