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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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Adsorpsi Ion Logam Pb (II) Menggunakan Karbon Aktif Teraktivasi H3PO4 dari Cangkang Buah Karet Rahayu, Martina Asti; Qisthi, Zummul; Wijaya, Dhian Eka; Gusti, Diah Riski; Lestari, Intan
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 1 (2024): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

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

Abstract

The use of activated carbon in Indonesia is increasingly expanding in line with the increasing demand for activated carbon, so it is necessary to develop activated carbon preparation using many raw materials and activators. Activated carbon from the shell of  rubber fruit using H3PO4 as activator has been synthesized  for adsorption of Pb (II) metal ion. The objective of this research is to find out the best concentration of H3PO4 activator on the activation of activated carbon of rubber shell, to know its ability as Pb (II) metal ion absorbent in solution and to know the characteristics of activated carbon. Parameters observed included activator concentration, pH and initial concentration of adsorbate. The results showed that the optimum activator concentration on preparation of activated carbon from the rubber shell was H3PO4 20% with the Pb(II)efficiency adsorption of 98,20%, while the optimum pH found at 4 with the adsorption capacity of 87,48% . The adsorption capacity increases with the concentration of adsorbate up to 30,73 mg/g at a concentration of 175 ppm. Activated carbon from rubber shell activated with H3PO4 has moisture content 9,22%, moisture content of 23,53%, ash content of 10,27% and carbon bonded 66,20% fulfilling the requirements of SNI 06-3730-1995 . The results of morphological analysis and carbon constituents using SEM-EDX showed that activated carbon contained 93,91% carbon element and Pb element concentration contained in activated carbon after adsorption of 1,13%.
Photodegradation of Methylene Blue Using ZnO/Perlite under Ultraviolet Light Burhanudin; Setyaningtyas, Tien; Riyani, Kapti
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 2 (2024): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no2.a17092

Abstract

The disposal of waste in the continuously growing industries leads to pollution caused by pollutants. One of them is liquid waste originating from the textile industry, which contains toxic coloring agents such as methylene blue that are difficult to decompose in the environment. Therefore, an effort is needed to tackle this issue using photocatalysis. A frequently used photocatalyst material is a semiconductor metal oxide like ZnO. However, ZnO semiconductors still have limitations in their applications. To overcome these limitations, ZnO catalysts will be modified with a supporting material like perlite, which is a lightweight and porous material. This study aims to examine the effectiveness of ZnO/Perlite in degrading methylene blue. The ZnO/Perlite composite with a 20% composition shows the highest photocatalytic activity compared to the ZnO/Perlite composites with 10% and 30% compositions. The optimum condition for ZnO/Perlite 20% in degrading methylene blue is achieved with a mass of 0.3 grams, at pH 11, with 2 hours of stirring under ultraviolet light irradiation, resulting in a photocatalytic activity of 47.59% and a combined adsorption and photocatalytic activity of 78.1%.
Analisis Butir Soal Pengetahuan Dasar Matematika Menggunakan Pendekatan Rasch L. Parisu, Chairan Zibar; Ekadayanti, Waode; Sisi, La; Juwairiyah, Arna; Kasmawati
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 1 (2024): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

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Abstract

The analysis of test items is emphasized as the main focus in improving the quality of tests and providing diagnostic information regarding students' understanding. The Rasch approach is chosen as the statistical method to assess the reliability and validity of test items in mathematics exams. This research specifically aimed to analyse the basic mathematics knowledge test items of elementary school students using the Rasch approach, with the goal of producing high-quality test instruments to measure students' basic mathematics knowledge. This study is a quantitative descriptive research with a sample of 75 elementary school students in Kendari. The analysed test instrument consisted of 25 multiple-choice questions and was analysed using the Rasch approach by implementing the Winstep program. The results showed that twenty-four items were valid and one item was invalid. The reliability obtained was categorized as good at 0.94. There were six items classified as the most difficult, seven items as difficult, nine items as easy, and three items as the easiest. As in the item differentiator, one item was categorized as very poor, one as poor, eleven as fair, and twelve as good.
Studi Kasus Nitrogen Dioksida dalam Ruang Bahan Kimia Kusuma Sari, Mustika; Andriyogana, Ridwan; Zulfah, Nida
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 1 (2024): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no1.a17249

Abstract

Indoor air quality is something that describes the indoor air quality in a building suitable for human activity and comfort. The purpose of this research was to determine indoor air quality based on NO2 levels in the air and No2-N levels resulting from dehumidifier absorption. The research was conducted on June 20 2023 and June 27 2023 in the materials room of the environmental quality laboratory faculty of civil engineering and planning (FTSP UII) Yogyakarta. In the morning at 08.00 WIB and in the afternoon at 16.00 WIB with each measurement for 60 minutes. The research method used in this research is quantitative research with data analysis techniques descriptive analysis. In the material room, the nitrogen dioxide (NO2) parameter does not meet the NAV while the NO2-N parameter meets the NAB.
Perancangan Bak Penampungan untuk Pembuangan Limbah Coolant dari Mesin Broaching Menggunakan Software Solidwork dan ANSYS Simulasi Lestyanto Ardi, Affan; Sena, Boni; Gusniar, Iwan Nugraha; Ujiburrahman; Oleh; Amanah, Nadia
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 1 (2024): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no1.a17257

Abstract

Industrial waste is one of the most serious problems in the industrial world. Industrial wastewater treatment plants as one of the solutions to overcome these problems require holding tanks as the main part of the system. Holding tanks function as waste reservoirs before further processing. Thus, holding tanks play an important role in reducing the negative impact of waste on the environment and preventing damage to industrial facilities. The holding tank is designed using solidwork and ANSYS in order to ensure the reability and capability in relocatting the coolant waste water. From the results of the research on the design of wastewater reservoirs, the maximum total deformation subjected to a load of 0.00017735 MM is obtained, while the smallest total deformation value is 1.9705 MM. The results of the maximum stress or voltage subjected to a load of 0.17112 Mpa while the smallest stress value is 0.080072 Mpa. And for the results of the maximum strain or strain subjected to a load of 6.868 Mpa while for the smallest strain value is 7.7904 Mpa.
Kajian Implementasi Higiene can Sanitasi (Studi Kasus Pasar Sleman Unit I) Sardi; Burhanudin, Taufik; Widyasari, Titiek
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 2 (2024): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no2.a17393

Abstract

Pasar Unit I Sleman merupakan pasar yang cukup ramai dengan aktivitas jual beli sehingga potensi penularan penyakit antar pengguna pasar dapat terjadi. Penting untuk menerapkan lingkungan pasar yang sehat agar permasalahan yang timbul dari kegiatan di dalamnya dapat diminimalisir. Penelitian ini bertujuan untuk mengetahui pelaksanaan higiene sanitasi dan kondisi air bersih untuk keperluan higiene sanitasi berdasarkan parameter yang ditentukan. Penelitian ini bersifat deskriptif kuantitatif dengan mengamati kondisi lingkungan pasar berdasarkan parameter lokasi, kondisi bangunan, sarana sanitasi, PHBS, dan keamanan, serta uji laboratorium terhadap tiga sampel air bersih dengan parameter seperti warna dan bau, tingkat kekeruhan, derajat keasaman ( pH), kandungan logam besi (Fe), daya hantar listrik (DHL), total padatan terlarut (TDS) dan kandungan O2 terlarut. Peraturan dasar yang digunakan adalah Peraturan Menteri Kesehatan Nomor 17 Tahun 2020 tentang Pasar Sehat, dan Peraturan Menteri Kesehatan Nomor 32 Tahun 2017 tentang Baku Baku Air untuk Keperluan Higiene Sanitasi. Hasil penelitian menunjukkan bahwa Pasar Unit I Sleman dinilai sebagai pasar sehat sedang dengan nilai 83,78%. Air bersih untuk higiene sanitasi ketiga sampel dalam kondisi baik yaitu jernih dan tidak berbau, kandungan Fe ketiga sampel 0,5 mg/lt, kadar pH 6,5, DHL dibawah batas maksimal 250 µs/ cm, nilai TDS dibawah 1000 ppm, dan kadar O2 terlarut < 4 mg/lt.
Sistem Kontrol Suhu dan Kelembapan pada Kandang Iguana Hijau Berbasis IoT Cloud Zen, Nur Afifah; Rifai, Muhammad; Maulana, Yulian Zetta; Permatasari, Indah
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 2 (2024): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no2.a17418

Abstract

One type of lizard that is popular in Indonesia is the green iguana, which belongs to the Iguanidae family. Green iguanas are cold-blooded animals that often sunbathe to adjust their body temperature to the same as the environmental temperature so that the iguana's digestive system can be optimal. Therefore, green iguana lovers or breeders need an IoT-based maintenance solution. This research aims to design a green iguana cage that can maintain temperature and humidity automatically using a DHT22 sensor. Based on test results, the IoT-based temperature and humidity control system in the green iguana cage was proven to be effective in maintaining environmental conditions in the cage. On the 1st day of testing, the average temperature and humidity sensor errors in the system design at three different times were 1.03% and 2.24%, respectively. Furthermore, on day 2, the average temperature and humidity sensor errors were 1.359% and 1.739% respectively. This system works effectively, where the humidifier maintains humidity by obeying the limits of turning off at humidity above 80% and turning on below 70%. Meanwhile, the light adjusts its brightness level based on temperature with a range of 30°C - 35°C. This system is able to maintain temperature and humidity with 97% accuracy. The results of the tested data are sent to the IoT Platform so that they can be accessed in real-time. The test results for the delay value of 90.45441238 ms indicate that data transmission is in the very good category.
Morfologi Koloni Bakteri Endofit dari Akar Tanaman Kopi Arabika Maulana, Mizan; Safriani, Suri Raihan; Ritaqwin, Zaitun
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 2 (2024): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no2.a17501

Abstract

Many endophytic bacteria live inside and outside healthy plant tissue, including coffee plants. Each type of plant in a different region certainly has different types of endophytic bacteria. This research aims to isolate endophytic bacteria from the roots of coffee plants taken from one of the community's coffee plantations in Dedamar Village, Bintang District, Central Aceh at an altitude of 1200 meters above sea level. Isolation was carried out by taking 100 ml samples of rinsed and crushed coffee roots and spreading them on NA media. Then incubating them for 24 hours so that the bacteria could grow and develop. There was 1 isolate of endophytic bacteria that was successfully isolated from the roots of coffee plants.
Soil Bacteria Community Composition Indicating Soil Quality in Different Tillage Practices Khafida, Wilda; Ratnaningsih, Hanim Rahayuani
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 2 (2024): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no2.a17546

Abstract

Organic tillage practice of current study used fully cattle manure, while semi-organic tillage used cattle manure and 10% of synthetic fertilizers as transition to reduce chemical inputs in order to improve sustainable production and ecosystem health. Despite the important role of soil microbes in soil of agriculture, we still have limited understanding of the complex response of microbial composition to organic and semi-organic tillage practices. The aim of this work was to evaluate the impact of use of organic and semi-organic tillage practices on bacteria abundance, richness and functional diversity of microbial communities. Analysis of soil bacteria using nutrient agar by serial dilutions of soil suspension was performed to quantify bacteria abundance. They were further identified and categorized into IAA-producing bacteria and non IAA-producing bacteria groups in Tryptic Soy Agar (TSA). Bacteria abundance was significantly higher in semi-organic tillage than organic tillage. Even though bacteria richness did not show statistically significant, beneficial effect of organic tillage was reflected in higher bacteria richness in term of isolates. The assessment of their functional diversity on producing IAA hormone demonstrated higher IAA-producing bacteria than non IAA-producing bacteria in both tillage practices, indicating the availability of rich substrate through introduction of cattle manure improve soil quality and beneficial for soil bacteria. We observed that among all physicochemical properties, C-organic indicated highly significant, higher in organic tillage than semi-organic tillage. It has been proposed that the availability of organic carbon may favour bacteria as resource of energy.   Keywords: Bacteria community composition; IAA-producing bacteria; Organic tillage; Semi-organic tillage
Pengembangan Sistem Deteksi Otomatis untuk Kelayakan Lingkungan Penanaman Microgreen Buatan Berbasis Sensor IoT Sari, Eka Yulia; Rahmawati, Titik; Septianto, Yudhistira Wahyu; Maharani, Rahil Putri
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 10 No 2 (2024): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol10.no2.a17553

Abstract

One of the issues that needs to be acknowledged by all parties is the decreasing agricultural land due to its conversion into residential areas, while the human population continues to grow in proportion to food demand. Urban farming emerges as a solution to address the constraints of agricultural land by utilizing available space. Moreover, urban farming could be the support for food security, especially at the household level. The utilization of IoT technology could be applied to support this urban farming initiative. We have designed a prototype of an artificial ricefield for microgreen cultivation that is integrated with IoT to monitor the planting process and provide environmental feasibility recommendations. Environmental feasibility recommendations are measured by three indicators: room temperature, air humidity, and soil moisture. The devices used are the DHT11 sensor for detecting temperature and air humidity, and the NodeMCU ESP32 DevKit V.1 microcontroller for data processing, enabling the DHT11 sensor detections to be displayed on a website. The test results show that the Mean Squared Error (MSE) for each indicator is as follows: temperature 2,9 %, air humidity 3,9 %, and soil moisture 5,4%. Because each indicator of the MSE value obtained is low, this prototype is suitable for development.

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