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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 107 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.

Page 11 of 11 | Total Record : 107

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