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Jurnal Teknosains
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  This is an Open Access Journal Open Access journal
ISSN (Print) 2089-6131 - ISSN (Online) 2443-1311
Published by Universitas Gadjah Mada Homepage  [48 journals]
  • Editorial

    • Authors: Widowati Siswomihardjo
      Abstract: Jurnal Teknosains merupakan salah satu jurnal di bawah Sekolah Pascasarjana Universitas
      Gadjah Mada yang memiliki minat serta program studi yang beragam. Dengan berangkat
      dari keilmuan lintas disiplin, Jurnal Teknosains edisi Juni ini juga mengemban semangat yang
      beragam dalam menerbitkan suatu hasil atau karya ilmiah dari beragam disiplin ilmu. Selain itu,
      penerbitan di edisi ini telah memilih delapan artikel dari lintas institusi. Hal tersebut dilakukan
      untuk menambah diversifikasi penulis dari Jurnal Teknosains agar semakin memberikan dampak
      yang luas dalam bidang publikasi, khususnya dalam bidang sains dan teknologi secara nasional.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.74533
      Issue No: Vol. 11, No. 2 (2022)
  • Jejak karbon pada tahap operasional agro-eduwisata kota mataram
           menggunakan pendekatan penilaian daur hidup

    • Authors: Joni Safaat Adiansyah
      Pages: 91 - 100
      Abstract: Climate change is one of the global issues that require the participation of all stakeholders for handling. In addition, the climate change issue is listed as one of the sustainable development goals (SDGs). The Government of Mataram city, as one of the stakeholders, has committed to involve the climate change consideration into its planned program, including the development of agro-edutourism facility. This study aims to calculate a carbon footprint of agroedutourism facility during the operational stage in order to implement the Greenhouse Gas (GHG) emission reduction strategy. The method used is a life cycle assessment approach with ReCiPe analysis, and the functional unit is an annual carbon footprint per m2 area of agro-edutourism. The study showed that the total carbon footprint per m2 was 2.88 KgCO2-e per annum with the primary environmental hotspot was fossil fuel utilization in energy source of agro-edutourism facility (Electricity State-own Company) and visitor vehicles. Therefore, some strategies could be applied for reducing the carbon footprint, such as increasing the utilization percentage of renewable energy (solar panel), using energy-saving bulbs, preparing the facilities for zero-emission vehicles, and applying the green building concept or design. Further research is required to assess the energy management concept from the technical feasibility aspect and economic aspect for complimenting this study.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.55847
      Issue No: Vol. 11, No. 2 (2022)
  • Proses difusi relativistik melalui persamaan langevin dan fokker-planck

    • Authors: Arista Romadani, Muhammad Farchani Rosyid
      Pages: 101 - 111
      Abstract: Brownian motion theory is always challenging how to describe diffusion phenomena with the main issue is how to extend the classical theory of Brownian motion to the special relativity framework. In this study, we formulated dynamics and distribution of a Brownian particle in relativistic framework by using Langevin and Fokker-Planck equation. By representing Brownian particle dynamics by Langevin equation, the velocity curves  were dependent on the presence of viscous friction coefficient (heat bath), and were used generalized in special relativity theory, A relativistic Langevin equation reduces to the classical theory at low velocities. Likewise, the distribution of Brownian particles is represented  as a stationary solution of the relativistic Fokker-Planck equation. From numerical results, we found that the probability density in the relativistic Fokker-Planck equation for  was reduced to the standard Fokker-Planck equation in Netownian classical theory. For  the calculation result showed that the Hanggi-Klimontovich approach has a consistent result to the relativistic Maxwell distribution. This work could open a promising interpretation to formulate the diffusion phenomena into general relativity theory.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.63229
      Issue No: Vol. 11, No. 2 (2022)
  • Analisis spasial temporal zona rawan kekeringan lahan pertanian berbasis
           remote sensing

    • Authors: Agus Suprihatin Utomo, M. Pramono Hadi, Emilya Nurjani
      Pages: 112 - 127
      Abstract: A mapping model of drought-prone zones for agricultural land based on Geographic Information Systems is needed to determine the distribution of drought vulnerability levels that occured in Bantul Regency, DI Yogyakarta. This study aims to determine the estimated area of agricultural land drought based on the interpretation of aerial images. This study compares the performance of the drought potential index of agricultural land using the Normalized Difference Drought Index (NDDI) algorithm based on remote sensing technology/ Landsat 8 satellite imagery to identify the estimated zones indicated for agricultural land drought that occurred in Bantul Regency, based on trends in spatio-temporal data with recording intervals from the 2015 until 2020 data representative during the dry season. Comparisons were made by looking at the performance between indices extracted from Landsat 8 imagery data based on the value of the green vegetation parameter/ Normalized Difference Vegetation Index (NDVI) and the soil and vegetation moisture parameters/ Normalized Difference Water Index (NDWI). The method used in this research is descriptive correlative method: quantitative and qualitative deductive using geostatistical indicators based on big data analysis to measure and compare various data variables spatio-temporal. The distribution of agricultural land drought through the NDDI index transformation method on a normal, mild, moderate, to severe scale occurs in almost all areas of Bantul Regency. This happened, due to the influence of natural activities of the global climate phenomenon ENSO, the impact of the transition of the El Nino phenomenon to La Nina (wet drought) which was more dominant in 2016. The average area affected by drought in Bantul Regency on a normal scale affected was ± 6.500,49 ha, affected by mild drought was ± 17.192,16 ha, affected by moderate-scale drought was ± 8.636,155 ha, and affected by drought of heavy scale agricultural land was ± 2.407,485 ha.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.67932
      Issue No: Vol. 11, No. 2 (2022)
  • Efektivitas sistem gabungan penukar kalor-udara tanah dengan kolektor
           surya untuk pendinginan ruangan di kota Medan

    • Authors: Tulus Burhanuddin Sitorus, Syahrul Abda
      Pages: 128 - 140
      Abstract: Energy is one of the main things in a country's economic growth, but saving energy is one of the main challenges in the world today. In developing countries such as Indonesia, the energy sector is considered a crucial sector, because consumption demand increases compared to production. Therefore, to reduce energy consumption it is necessary to save energy. Earth-air heat exchanger cooling systems are one of them. The research objective was to determine the effectiveness performance of the EAHE system on changes in room temperature according to weather conditions in Medan city. The implication of this research is to reduce the consumption of electricity or fuel oil and environmental pollution. The test room has dimensions of 200 cm x 200 cm x 200 cm. Testing using a flat plate type solar collector to help the process of air movement by taking advantage of differences in air temperature. The testing process starts at 08.00 WIB to 17.00 WIB for nine hours everyday. The measurement results show that various weather conditions include radiation intensity, ambient temperature and humidity. During the test, the radiation intensity ranged from 38.10-892.12 W/m2, the variation in ambient temperature from 24.65-35.29oC and the average air humidity 68.93%. The experimental data showed that the fluctuation of indoor air temperature ranged from 23.01 to 31.84oC and the average room temperature 27.83oC. This study resulted in an average effectiveness value of the EAHE system of 51.49%. According to the result of the statistical studies, the weather conditionsthe effectiveness of the EAHE system by51,56%.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.61271
      Issue No: Vol. 11, No. 2 (2022)
  • Structural performance of 1 way and 2 way setback with the soft first
           story using ddbd

    • Authors: Anis Rosyidah, Indriyana Luthfiyanti
      Pages: 141 - 153
      Abstract: Irregular building structures increasingly varied, such as setback buildings and buildings with soft level stiffness irregularity on the first floor of the building (soft first story). High-rise buildings are at risk of collapse due to earthquakes. Designing efficiency requires a Direct Displacement Based Design (DDBD) method. In this study, the DDBD method uses pushover analysis on soft first-story buildings without a setback,1-way setback, and 2-way setback. This study aims to obtain the value software's value of displacement, story drift, ductility, plastic hinge response, and performance levels study indicates that the displacement value of the soft first-story building without setback is smaller than the setback building. In addition, the value of displacement and story drift in the setback building with a soft first story is influenced by the small setback area ratio. The highest displacement and story drift values in the X direction are 1-way setback buildings, which are 0.422 m and 0.0147 m, while in the Y-direction, the 2-way setback buildings are 0.44 m and 0.0167 m. The most significant value of actual ductility is a building without setbacks with a soft first-story. The plastic hinge response in all three buildings shows a strong column weak beam. The level of structural performance in all three buildings is at the level of Immediate Occupancy, where the value of the performance level of the FEMA 356 method is greater than the ATC 40 method.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.61136
      Issue No: Vol. 11, No. 2 (2022)
  • Pengaruh penambahan kacang hijau (Vigna radiata (l.) R. Wilczek) pada
           fermentasi susu oleh lactococcus lactis nbrc 12007

    • Authors: Raras Ahlul Widawati, Endah Retnaningrum
      Pages: 154 - 161
      Abstract: The high content of α-galactooligosaccharide in mung beans has the potential for supporting the growth of Lactic Acid Bacteria (LAB), therefore it can be developed as fermented plant-based milk that substituted Ultra High Temperature (UHT) milk. The purposes of this research is to investigate the effectiveness of LAB Lactococcus lactis NBRC 12007 in the fermentation process of mung bean milk and to observe the quality differences of fermented mung bean milk with UHT milk.  Previously, preparations were made for starter L. lactis NBRC 12007 in MRSB medium and then sub cultured to UHT milk. Furthermore, 3% of the culture was inoculated into each of the mung bean milk substrate and UHT milk as a starter for the fermentation process and incubated for 24 hours at 37oC. During this process, the effectiveness of LAB was tested (total cell, total acid, total protein, pH, antibacterial) and the quality test of fermented products (organoleptic and physical).  Based on total cells, total acid, total protein, pH, and antibacterial test findings, fermented mung bean milk products had a higher value than UHT milk products. During the process, it was proven that L. lactis NBRC 12007 had high effectiveness in producing and improving the quality of fermented mung bean milk compared to UHT milk. It is assumed that the content of oligosaccharides supports the growth of LAB and the fermentation process.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.52051
      Issue No: Vol. 11, No. 2 (2022)
  • Akurasi dimensi produk filamen 3d printing berbahan polipropilen
           menggunakan mesin ekstrusi

    • Authors: Mochamad Edoward Ramadhan, Mahros Darsin, Sains Ilham Akbar, Danang Yudistiro
      Pages: 162 - 173
      Abstract: Additive manufacturing (AM) has been trending topic in industrial revolution 4.0. One technique and the most widely used AM is fused deposition modeling (FDM), which uses a melted filament and deposited it layer by layer. The common filaments used are made of PLA, PP, and ABS, which are available at the online market with variety of prices depend on the quality. It is an advantage if we can make these filaments. In filament manufacturing, the dimensional accuracy is one of the most important factors to comply with the existing 3D printers. The aim of this research is to fabricate a filament made of PP, then assessed the quality based on the accuaray of the targeted diameter of 1.75 mm. The manufacturing process used a self-made plastic extrusion machine. Variations were made on three variables with three levels each. There are (i) heater band temperature with a minimum and maximum range (150/170 oC, 155/175 oC and 160/180 oC), (ii) winding speed (13 mm/s, 16 mm/,s and 19 mm/s), and (iii) roll distance to the nozzle set point (200 mm, 500 mm and 700 mm). Taguchi L9 design was used to design the experiments and analysis.Minitab 19 was employed to find the S/N ratio and analysis the variance (ANOVA). The results of the analysis state that two parameters have a significant effect on the dimensions of the filament, i.e. temperature and roll distance to the nozzle, while, the winding speed has no dominat effect. The best accuracy of filaments diameter was achieved when applying a combination of temperature (160/180 ⁰C), the distance between the nozzle to the roll of 700 mm, and winding speed of 13 mm/s.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.63878
      Issue No: Vol. 11, No. 2 (2022)
  • Faktor yang berhubungan dengan kepatuhan berobat penderita tuberkulosis
           paru di kota Sorong

    • Authors: Meliana Depo, Dirgantari Pademme
      Pages: 174 - 183
      Abstract: Tuberculosis is still a major burden of disease in Indonesia. The disease is highly transmissible, and if it is resistant to drugs, treatment can be take a long time. Patients with pulmonary tuberculosis will be difficult to cure if there is no regular treatment. This study aims to identify factors related to patient adherence to tuberculosis treatment in Sorong City. The study uses a cross-sectional design with 72 respondents. Data collection through interviews with a structured questionnaire. Samples were pulmonary tuberculosis patients recorded as having followed treatment for at least two months from 2018 to 2019 at RSUD Sorong. Data were analysed using the Chi-square test. The results showed that 55.6% of respondents adhered to treatment for pulmonary tuberculosis. The variables associated with adherence in patients with pulmonary tuberculosis in Sorong City were drug side effects (p-value = 0.013) and the support of the supervisor taking medication (p-value = 0.000). In order to improve adherence to tuberculosis treatment, health workers should create a tracking system for patients who are non-compliant and expand case management’s capacity to advise patients.
      PubDate: 2022-05-09
      DOI: 10.22146/teknosains.61225
      Issue No: Vol. 11, No. 2 (2022)
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