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Journal of Science and Applicative Technology
Published by Institut Teknologi Sumatera
ISSN : 25810545     EISSN : 25810545     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Science and Applicative Technology is soon indexed by google scholar, SINTA (Science and Technology Index), portal garuda, DOAJ (Directory of Open Access Journals). This journal has been registered at PDII LIPI (ISSN: 2581-0545). This journal is semiannual journal. It will be published in June and December. The objective of the journal is to provide a room for students, researchers, lecturers, pratictioners and communities to present their ideas regarding several topics covered in this journal. Journal of Science and Applicative Technology covers wide area of research. We welcome full research articles in the following area, including but not limited to : 1. Renewable Energy 2. Green Infrastructure 3. Community Development 4. Computer Science 5. Civil and Environmental Engineering 6. Electrical Engineering 7. Mechanical Engineering 8. Telecommunication 9. Earth and Planetary Sciences (Geography, Geodesy, Geology, Geophysics, Oceanography, Astronomy, Atmospheric) 10. Natural Sciences (Mathematics, Chemistry, Physics, Statistics) 11. Life Sciences (Biochemistry, Biology, Pharmacy) 12. Regional and City Planning
Arjuna Subject : -
Articles 8 Documents
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Search results for , issue "Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter" : 8 Documents clear
Peramalan Cryptocurrency dengan Autoregressive Integrated Moving Average (ARIMA) dan Risiko Kerugian dengan Value at Risk (VaR) Amalia Listiani; Dani Al Mahkya
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.904

Abstract

Blockchain is a technology that is used for recording digital transactions that are interconnected and cannot be changed. Cryptocurrencies use blockchain technology, which has advantages due to a high level of security, low fees, and a high return on investment. One of the most popular cryptocurrencies and one that has a high market cap is Bitcoin. High volatility carries the risk of large losses. So it is necessary to analyze the risk of loss and forecast Bitcoin. Forecasting is carried out using the Autoregressive Integrated Moving Average (ARIMA) model, which is then carried out by risk analysis using Value at Risk (VaR) using the Historical Data method. Based on the research results, ARIMA [4,1,2] was great for predicting Bitcoin, with a Mean Absolute Percentage Error (MAPE) of 6%. Based on the results of research with Value at Risk (VaR), investors have a maximum loss tolerance of 5.86% and there is a 5% possibility that the losses will exceed 5.85%.
ARANG AKTIF SERAT SABUT KELAPA DAN APLIKASINYA SEBAGAI ADSORBEN ION KROMIUM(III) DARI LARUTAN AIR Manuntun Manurung; Widihati Widihati; I.A.G. Yunilawati
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.1003

Abstract

The coconut husk contains high cellulose, so it can be processed as a basic materials to make activated charcoal. The purpose of the study was to make activated charcoal from coconut husk fiber with hydrochloric acid activator and to determine the effect of changing coconut husk fiber into charcoal, as well as activation of the adsorption power of Cr(III) metal ions from solution. The research started by separating the coconut husk fiber, carbonization at various temperatures. The resulting charcoal was characterized according to SNI 06-3730-1995. The best quality charcoal was activated with HCl, then coconut husk fiber, unactivated and activated charcoals were applied to absorb Cr(III) ions. Optimization of adsorption parameters such as contact time, solution pH, temperature and adsorption isotherm were also studied. The results showed that the optimum carbonization temperature was 600oC, contact time was 5 hours, optimum pH was 6, room temperature. The adsorption capacity of Cr(III) ions were 8.2580 mg/g, 13.5645 mg/g and 16.1452 mg/g for coconut husk fiber, unactivated and activated charcoal, respectively. The increase in adsorption power from coconut husk fiber to charcoal was 64.36% and from charcoal to activated charcoal increased by 19.02%. Coconut husk fiber and unactivated charcoal followed the Langmuir isotherm while activated charcoal followed Freundlich.
Studi Eksperimental Pengaruh Variasi Sudut Kemiringan Poros Terhadap Kinerja Turbin Ulir Archimedes Kukuh Pribadi; Dedet Hermawan Setiabudi; Bahrul Jalaali
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.938

Abstract

This study aims to design and conduct an experimental study of axle tilt angles variation on the performance of the Archimedes screw turbine (AST). The AST was constructed based on Rorres (2000) [3] formulation to achieve the optimum design of AST. This design was obtained with the followings parameters: 1.7m turbine axle length, 0.069m and 0.128m of internal and external turbine radius, 0.260m pitch length, 6.5 pitches number, 59° and 72° of external and internal blade angel, and 2 number of blades. The screw turbine performance was experimentally carried out by varying the angle of the turbine axle in the range of 25°, 30°, 35°, 40°, and 45°. The test was utilized the natural river flow with an average discharge of 0.011 m3/s. The result was yielded that the optimum angle of the turbine was at a turbine tilt axle of 35° while the rotational speed was 265.5 rpm, whereby the turbine generated 48.81W power and 4.09Nm of torque. This study is hopefully beneficial for the turbine design reference as well as its experimental evaluation.
PEMODELAN PENGINDERAAN JAUH UNTUK ESTIMASI SIMPANAN KARBON DI BLOK 1 PT ALAM BUKIT TIGAPULUH Arief Firmansyah; Hamzah Hamzah; Eva Achmad
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.964

Abstract

Biomass calculations are useful for knowing the amount of carbon stored in a forest ecosystem and essential steps to mitigate global warming and climate change. Restoration activities at PT Alam Bukit Tigapuluh (PT ABT) have indirectly made efforts to absorb carbon dioxide (CO2). This study aimed to analyze and measure carbon storage as well a model and map carbon storage at PT ABT. The method used the survey method of species, diameter at breast height, and vegetation height with a plot size of 20mx20m. The research conducted to analyze carbon storage and build a regression model. The results showed that the average carbon storage of the 30 plots was 259.32 tons/ha and the estimated carbon storage is 5,496,233 tC. The best regression model’s modelling result are Y = -817 + 331.5 MSRVI with the correlation of determination being 76.40%. The distribution of carbon storage in PT ABT is divided into 5 classes, namely, non-vegetated class (<0 tons/ha) of 57 ha, low (0-112.55 tons/ha) of 291 ha, medium (112.55-225.11 tons/ha) covering an area of ​​2,059 ha, high (225.11-337.67 tons/ha) covering an area of ​​18,533 ha and very high (>337.67 tons/ha) covering an area of ​​1,256 ha.
Semi-Empirical Estimation of Velocity Profile for Shallow Gravel Bed Channel Rahma Yanda; Morihiro Harada; Ichiro Tamagawa
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.885

Abstract

The dependence of flow velocity distribution near the bed on the roughness geometry has led to various approaches for estimating the velocity. Themodels proposed bypreviousstudies aremostlybased on segmented velocityprofiles(e.g., a linear distribution within theinterfacial sublayer and logarithmic distributions above the interfacial sublayer). By increasing number of segments, the possibility of errors in the parameters, as well as constants, are likely to rise. This study assessed the applicability of a hyperbolic tangent function velocity model to estimate double-averaged velocity profile for shallow flow over a rough gravel bed as a single model concept, especially for the area within roughness layer. Velocity profiles over gravel beds with different arrangements and roughness densities from previously published studies using laboratory measurements were used to validate this model. The behaviours of related constants for this model in response to changes in the flow depth and roughness geometry were investigated, and limitations on it application were evaluated. It was found that the constants required to apply hyperbolic tangent function are affected by roughness geometry function and relative submergence. Through this study also observed that HTF is reliable to describe the velocity profile for about twice of geometric roughness height.
Pengembangan Pengontrol Tegangan Sistem Mikrogrid Cerdas Menggunakan Sistem Baterai Penyimpan Energi Putu Handre Kertha Utama; Irsyad Nashirul Haq; Edi Leksono; Justin Pradipta; M Daya Imannata; Timothius Pratama Tjahja
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.594

Abstract

A power outage on a conventional grid can cut the electricity supply to the entire load. In contrast, Microgrid (MG) can still supply at least the most critical local loads even though blackout occurs in the main grid. MG can also utilize renewable energy sources such as solar and wind energy to generate electricity. That is possible by the advancement of the battery energy storage system (BESS). The BESS able to maintains electricity supply to the load even in outages. The inverter on the SBPE also plays a role in stabilizing the MG output voltage by supplying or absorbing reactive power in the MG system. This paper focuses on the control development of the battery inverter primary controller. The droop control design utilizes the deadband around the nominal voltage. That becomes the improvement of the droop control method used in this study compared to the initial formulation of the droop method. The proposed method was then tested through simulation with four different scenarios. The BESS will operate in the voltage range 194.9V to 234.6V with a droop control deadband in the voltage range 198.0V to 231.0V. Based on the simulation results, the addition of SBPE with the MG scheme on the existing system can improve the quality of the voltage received by the load from 0.994p.u. to 0.997p.u. The simulation also shows that the load still gets a power supply even though there is a blackout on the main grid.
FORMULASI NANOEKAPSULASI EKSTRAK DAUN KELOR (Moringa oleifera) /KITOSAN-NATRIUM TRIPOLIPOSFAT (NaTPP) Vivi Purwandari; Isnaeni Isnaeni; Rizka Rahmi; Ahmad Zukhruf Akbari; Muhammad Zaim Akbari
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.1100

Abstract

Moringa (Moringa oliefera) contains several antioxidant compounds such as quercetin and chlorogenic acid. However, antioxidants have weaknesses, namely that they are easily damaged by exposure to oxygen, light, high temperatures, and drying. One way to maintain and increase the stability of antioxidants is by encapsulation. The purpose of this study was to determine the optimum formulation of quercetin nanoencapsulation of moringa leaf extract using chitosan and sodium tripolyphosphate (Na-TPP) using the ultrasonication method. Moringa leaf extract was obtained by repeated ultrasonication 1x 15, 3x15, and 5x15 minutes, frequency 24 kHz, and using alcohol 96%. The encapsulation process was carried out with three variable ratios of the amount of chitosan: Na-TPP added to 10 mL of Moringa leaf extract solution (F0), namely 5:1 (F1), 2:1 (F2), and 1:1 (F3). Test results for flavonoids as quercetin using a UV-Vis spectrophotometer showed that the Quercetin content in Moringa leaf extract ultrasonicated 5x15 minutes was 12.146%, the characterization of the Particle Size Analyzer (PSA) showed encapsulated particle sizes of 170.3 and 209.7 nm with polydisperse index <0 .5, the antioxidant activity test using the DPPH method showed that F0 was 61.4% and F2 had the highest antioxidant activity, namely 81.2%. Analysis of the morphology of nanoparticles using Scanning Electron Microscopy (SEM) showed that the particles were spherically distributed evenly. Nanoencapsulation of Moringa leaf extract has resulted and an increase in the antioxidant activity of Moringa leaf extract after encapsulation using Chitosan-NaTPP, from 61.4% to 81.2% (F2).
UJI AKTIVITAS EKSTRAK BUNGA KECOMBRANG (Etlingera elatior Jack) SEBAGAI HIPOLIPIDEMIA PADA TIKUS WISTAR OBESITAS Sri Wardani; Ni Wayan Bogoriani; Ni Luh Rustini
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.1000

Abstract

Kecombrang (Etlingera elatior Jack) is a plant that has potential for hypolipidemia. Kecombrang has secondary metabolites consisting of tannins, saponins, alkaloids, steroids, terpenoids, phenolics, and flavonoids. The purpose of this study was to determine the hypolipidemic activity of kecombrang flower methanol extract in obesed Wistar rats fed a high-fat diet. The test animals used in this study were 18 female white rats aged two months, weight of ± 150 grams. The test animals were divided into three groups, namely normal control (only given standard feed), high-fat control (obesed rats with high-fat diet), and flower treatment group (obesed rats with a high-fat diet + flower methanol extract 100 mg/kgBW) orally for 30 days. The results showed that kecombrang flowers reduced total cholesterol levels by 55.5%, triglycerides (TG) by 57.4%, LDL by 76.73%, and increased HDL by 42.96%. The kecombrang flower has the potential for hypolipidemia which is characterized by a decrease in total cholesterol, TG, LDL, and can increase HDL levels in obese rats significantly (p<0.05).

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