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INDONESIA
Jurnal Teknosains
Published by Universitas Gadjah Mada
ISSN : 20896131     EISSN : 24431311     DOI : https://doi.org/10.22146/teknosains.xxxx
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Teknosains is a peer-reviewed journal which began publication in 2011, and published each semester in June and December. It is a series of scientific publications in engineering, science and technology area. Jurnal Teknosains aims to encourage research in Science and Technology studies. Topics addressed within the journal include but not limited to: Engineering, which is divided into several topics: Mechanical Engineering, Industrial Engineering, Biomedical Engineering, Chemical Engineering, Nuclear and Physical Engineering, Civil Engineering, and Planology. Basic Sciences, which is divided into: Chemistry and Physics Health Sciences, which is divided into: Medical, Biotechnology specially in Health Science, and Dentistry
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 8 Documents
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Search results for , issue "Vol 10, No 1 (2020): December" : 8 Documents clear
Tinjauan geografis wilayah potensial ibukota negara Indonesia Anugerah A. Sahamony; Luthfi Muta’ali; Estuning Tyas Wulan Mei Mei
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.36756

Abstract

The number of actual problems in the existing capital of Indonesia raises the idea to move the national government center to another region. From all parts of Indonesia republic territory, which region is most potential to be the location of the nation’s capital relocation? The aim of this research is to identify the most potential area to be the location of the national government center development. The method used is this research is a quantitative analysis with ‘zooming’ concept. The analysis process is divided into three stages with nine assessment indicators. The stages are; (1) identifying the most ideal provinces using spatial centrality, external accessibility, and the vulnerability of macro-scale natural disaster variables, (2) identifying the most potential province using the potential of social condition, the potential of infrastructure development, and the potential of national economic integration variables, and (3) determining the most suitable zone to be the location of nation’s capital development, which is using variables of physiological and regulational suitability (land availability, water aviability, and the vulnerability of micro-scale disaster). The results of this research indicate that Paser Distict in Kalimantan Timur is the most potential region to be the future nation’s capital of Indonesia.
Design of ergonomic chair for grinding operation Andrean Emaputra; Taufik Hidayat; Gunawan Budi Susilo
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.41053

Abstract

One of essential production activities is grinding process. This process mainly involves the constant activity of eroding a surface to be smoother or more evenly, cutting a workpiece, creating profiles like angles and arches, sharpening a cutting tool, and finishing a final product. Meanwhile, there is no study evaluating the risk levels of workers working on grinding, and there is no unique chair specifically designed for the process. Therefore, this study aims to assess the risk levels of a grinding worker and to propose the design of an ergonomic chair that is adjustable, comfortable, durable, and keen to be used. The risk levels of the grinding workers were evaluated using REBA, while the ergonomic chair design was based on anthropometric data taken from 4 grinding workers in Bantul, Special Region of Yogyakarta, Indonesia. The researchers selected a buttock-popliteal length (seat depth), lower leg length (popliteal height) and hip breadth sitting as anthropometric measures to make a chair design for the grinding operations. After that, the existing adjustable chair designs were also considered and evaluated to get better adjustableergonomic chair design for the grinding operations. The results show that it is important that the stakeholders improve most of the grinding operations of the workers, especially by using an ergonomic chair design for grinding operation that is adjustable, comfortable, durable, and reliable. The chair height can be adjusted from 361-414 mm to adapt with the users, and the variation in product height aims to prevent bending on the back. Finally, the grinding chair can reduce the risk level from the high and medium level to the low-risk levels of working postures.
Rasio natrium karbonat dalam ekstraksi berpengaruh pada mutu natrium alginat sargassum muticum Sovia Indah Nurkhanifah; Amir Husni
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.41982

Abstract

Brown seaweed is one of Indonesia’s biological resources which has good potential as source for alginate which can be used for the food and non-food industries. Alginate was most widely used in the textile sector around 50%, food industry 30%, paper industry 6%, welding rods 5%, pharmacy 5% and other 4%. The process of taking alginate from brown seaweed can be done by extraction. Several studies have been carried out in an effort to improve the yield of alginate extraction. The objective of this study was to determine the effect of the ratio of Na2CO3 and obtain the best ratio of Na2CO3 for producing sodium alginate from Sargassum muticum. The ratio of Na2CO3 used was 1:10, 1:20, 1:30, 1:40, 1:50 (w/v) and observations of alginate quality included yield (%), viscosity (cps), pH, water content (%), whiteness degree (%), ash content (%) and functional groups. The results showed that the higher the ratio of Na2CO3 produced the lower viscosity and showed significantly different values but yield, pH, water content, whiteness degree, and ash content were not significantly different. The functional groups at the ratio 1:20, 1:30, and 1:40 (w/v) showed the alginate that were in accordance with the standard. The best ratio of Na2CO3 from this study was 1:20 (w/v) because it had a medium viscosity, besides that, the yield, pH, water content, whiteness degree, and ash content also accordance to the quality of alginate standard.
Karakteristik temperatur fluida dingin pada grooved double pipe heat exchanger Putu Wijaya Sunu; I Putu Darmawa; Anak Agung Ngurah Bagus Mulawarman; I Made Suarta; I Putu Gede Sopan Rahtika
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.43291

Abstract

Heat exchangers have widespread applications in many industrials process. There are many kind of heat exchanger. One of the simply heat exchanger is double pipe heat exchanger. The need for lightweight and enhancing the heat transfer of heat exchanger accomodated by surface engineering. One of the surface passive technique applications is groove. Incising groove in pipe as concerned wide consideration as it need no additional power, decrease in weight of system and hence give more benefit in heat transfer. The characteristics of heat transfer in grooved double pipe heat exchanger was investigated experimentally in this article. The aim of this investigation is to reveal the phenomenon of temperature characteristics of cold fluid in the heat transfer process in the grooved double pipe heat exchanger. In this study, water are used as both hot and cold fluid with counter flow pattern, and the water flow rate equal to 15 lpm for both fluid. Grooves were incised on the annulus area in the outer wall of tube side with rectangular shape and circumferential pattern. The characteristics of groove dimension that are height of groove is 0,3 mm; distance between grooves is 8 mm; and the groove space which is as independent variables are 1 mm and 2 mm. The data from 1 mm and 2 mm grooves space were compared with no grooved double pipe heat exchanger data (smooth pipe). The hot fluid temperature is 50 ± 0,50C while the cold fluid temperature is 30 ± 0,50C. The temperature data on the inlet and outlet side of heat exchangers for smooth pipe, 1 mm and 2 mm groove space were compared to find out the characteristics of increasing cold fluid temperature. This study used the temperature rate and temperature acceleration method to compare the variables. The result shows that groove installation increases the amount of heat absorbed by cold fluid. The heat exchanger with 1 mm groove spaces, was able to absorb heat about ± 2.3 % better than heat exchanger with 2 mm groove space and 13,1 % better than heat exchanger with no groove.
Pencucian material magnetik pasir besi lansilowo menggunakan larutan asam klorida Ricka Prasdiantika; Susanto Susanto
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.43985

Abstract

Iron sand was widely used in various fields such as in the manufacturing of magnets, cement, and steel. Iron sand has the main composition of iron oxide and several impurities of oxides. To remove these impurities, iron sand needs to be washed with acidic solution such as HCl solution. This study aims to minimize impurities in the magnetic material of Lansilowo iron sand. Iron sand was prepared using an external magnet to obtain magnetic material. The magnetic material was washed using distilled water and 0.5 M HCl solution. The drying process was carried out at 80oC for 24 hours. Magnetic material was crushed, weighed, and characterized. Material characterization was carried out using X-Ray Fluorescence (XRF), Fourier Transform Infrared (FT-IR) Spectrophotometer, and X-Ray Diffractometer (XRD). The Characterization results showed that washing of magnetic material using H2O-HCl 0.5 M was able to increase the percentage of Fe element composition in Lansilowo iron sand. The iron oxide contained in Lansilowo Iron Sand remains magnetite. The washing the iron sand magnetic material using 0.5 M HCl solution succeeded in removing impurities such as Mg, Pr, K, Cl, P, S, Co, Ce, and Sn as well as reducing the percentage of the Si and Al elements.The washing magnetic material using 0.5 M H2O-HCl produced higher XRD intensities than those washed with H2O. The washing magnetic material with 0.5 M H2O-HCl was result particle size of 37,70 ± 4,62 nm and crystallinity of 53.12%.
Pola perkembangan morfologi fisik kota di cekungan bandung periode 2009 – 2018 Ramadhan Pasca Wijaya; Bowo Susilo; Prima Widayani
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.45051

Abstract

Land development will be occur from time to time, the developments phenomenon will have either positive or negative impact. The impact of this phenomenon will affect various aspects, such as socioeconomic, mobility, land quality, and more. So the study on land development is required to evaluate and anticipate the negative impact on some region. To do evaluating and anticipating unwanted impacts a study can be carried out to become the basis for regional development or regional planning. one of them is to examine the pattern of urban development that will be used as a reference for regional development planning that will occur in the future. This study aims to analyze the development of urban physical morphology in Bandung Basin period 2009 - 2018. The method in this research is quantitative descriptive in the form of data collecting, data processing, modelling, and mapping. The research method is quantitative and qualitative in the form of data collection, data processing, modeling and mapping. The method of applying quadrant and burgess models to find the value of built-up land density that can reflect information on the phenomenon of built-up area development seen from the built-up area density in each agreed zone with geometric and quadrant models. The results in this research shows that the morphological structure of developed land in Bandung Basin is concentric with the highest density of 0.3459 km² which is centered in Cimahi and Bandung, also development is elongated and along the road with the majority of the land development create a leapfrog pattern, so it can be concluded that urban morphology in Bandung Basin is concentric with the linear development which is leapfrog.
Ekspansi termal linier dan residu malam inlei gigi dengan komponen parafin Indonesia Dyah Irnawati; Widjijono Widjijono; Harsini Harsini
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.46548

Abstract

Inlay wax is used for pattern of metallic inlays, crowns, and fixed partial dentures. Inlay wax must have a linear thermal expansion (LTE) and a residue that comply the standards. Inlay wax contains paraffin, carnauba, and beeswax. Paraffin and beeswax are produced in Indonesia. This study aims to examine the effect of the inlay wax compositions with paraffin and beeswax Indonesia on the LTE and residue properties. The research materials are paraffin (Pertamina, Balikpapan), beeswax (SEA, Yogyakarta), carnauba wax (Brataco Chemicals, Yogyakarta), and inlay wax (GC, Japan). Five inlay wax compositions are made with a ratio of paraffin, carnauba, and beeswax 60: 35: 5 (K-60), 65: 30: 5 (K-65), 70: 25: 5 (K-70), 75:20 : 5 (K-75), and 80: 15: 5 (K-80) (% w/w). The waxes were melted at 75 ± 5 oC then moulded for the TLE (267x6.35 x6.35 mm) and the residue (1 g) test specimens (n=4). The LTE and residue specimens were also made of paraffin, carnauba wax, beeswax, and commercial wax (n = 4). The LTE and residue tests were carried out based on ANSI/ADA specification No.4. Data were statistically analyzed by analysis of variance and LSD (α = 0.05). Anava test results showed that composition and temperature had a significant effect on LTE (p <0.05) and composition had a significant effect on residues (p <0.05). The LSD test results showed a significant difference in LTE of the K-75 group with other groups and the residues of the K-75 group and K-80 group with other groups (p <0.05). Inlay wax compositions with high paraffin concentrations have high LTE and residue. The value of LTE and residue of inlay wax with paraffin and beeswax from Indonesia are in accordance with the ANSI/ADA specification no. 4.
Analisis polarimetri alos 1 palsar untuk zonasi mineral alterasi hidrotermal di kabupaten Soppeng Sulawesi Selatan Anugerah Ramadhian AP; Retnadi Heru Jatmiko; Wirastuti Widyatmanti
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.51031

Abstract

Radar technology in remote sensing can be used for a variety of mapping, such as geological mapping. Soppeng Regency, South Sulawesi has a complex geological condition characterized by structural and intrusion phenomena with old materials. The phenomenon is an indicator of hydrothermal alteration due to magma intrusion activity in the rock bedding. Radar imagery is able to identify hydrothermal alteration zones through physical approaches such as landforms, rock (lithology), and geological structures. The aim of this research to explore the ability of radar polarization to identify hydrothermal alteration parameters and distribution pattern in Soppeng Regency. The physical characteristics are obtained from visual interpretation of the ALOS-1 PALSAR multi-polarization imagery with terrain analysis approach. Sample data is needed for petrographic analysis to determine rock minerals content. Analysis of physical characteristics and petrographic analysis were used to determine the type and distribution of hydrothermal alteration zones. The result of this study are ALOS-1 PALSAR imagery can be used to produce information on landform, rocks (lithology), and geological structures with total accuracy 83,9%. The hydrothermal alteration zone in Soppeng Regency consists of argillic 221,662 km², advanced argillic 20,239 km², phyllic 94,790 km², potassic 46,678 km², propylitic 328,746 km², sub-propylitic 181,517 km², and skarn 75,635 km².

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