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Published by Pusbindiklat Peneliti LIPI

ISSN : - EISSN : 24610976 DOI : 10.14203

Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics

Widyariset is a scientific journal which publishes the results of research and development, assessment, and systematic thinking about Natural Science.

Arjuna Subject : Umum - Umum

Articles 476 Documents

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PENGEMBANGAN SIMULATOR UNTUK PENGENDALIAN REAKTOR DAYA TIPE PWR Deswandri Deswandri
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The load following operation is a mode of operation, where the power level of nuclear power reactor is adjusted based on the load fluctuation at the electric grid. The changes of power level cause unbalance in the reactor. In order to keep the stability of reactor, it needs a specific control method. Three control methods for the PWR type reactors were developed for that purpose. Each method was tested by a numerical simulation, respectively. Since these methods were tested separately, however, it is difficult to compare the performance of all methods directly using the same initial parameters and various standard power patterns. In this work, we developed the simple simulator to simulate the control methods of PWR during the load following operation. By using the standard daily power patterns, it was showed that the simulator could be used well and all results agree with the previous results of the three control methods above. By using the same initial parameters and power pattern, the simulator could directly show the characteristic, superiority and disadvantage of each control method, respectively.

COLLECTIVE IDENTITY AS RESISTANCE(RESPONS TO THE SANTRI REGULATION OF PONDOK PESANTREN MIFTAHUL HUDA) Juju Saepudin
Widyariset Vol 14, No 1 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Pesantren generally practices regulation for the forming of character and discipline santri. But in reality the institution applying total institution always emerges resistance. This research wanted to know the pattern of covert resistance by santri to order of discipline. The method of collecting data were taken through observation, depth interview, and documentation study. From the result of inductively data analysis, it is known that the resistance pattern of santri who performed in groups provides space of collective identity development. With a collective identity, all santri develop cooperation to protect one another, especially in the framework of tight regulation manage in pesantren.

COMPARATIVE STUDIES OF COOPERATIVES ACT NUMBER 25/1992 WITH COOPERATIVES ACT DRAFT 2010 Yuni Sudarwati
Widyariset Vol 15, No 1 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Indonesia cooperatives condition that have not been able to be an Indonesia economics pillar need to getsupport. One kind of support needed is from legislation. Cooperatives Act Number 25/1992 changes is to supportdevelopment of cooperatives. This new cooperative act is expected to have more advantage for cooperatives development.The purpose of this research is to analyze advantage and disadvantage of cooperatives act draft 2010.Comparison between cooperatives act draft 2010 with Cooperatives Act Number 25/1992 based on InternationalCooperative Alliance (ICA) principal perspectives. The results show that cooperatives act draft 2010 has moreadvantage than cooperatives act number 25/1992 based on ICA principal perspectives.

CORROTION RATE AND MORPHOLOGY OF POROUS METAL ALLOY Mg-Ca-Zn WITH CaCO3 AS FOAMING AGENT Aprilia Erryani; Franciska Pramuji Lestari; Dhyah Annur; Muhammad Ikhlasul Amal; Ika Kartika
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Magnesium alloy is a material that has been developed as a biodegradable implant material in orthopedic applications. Magnesium alloys have good biocompatibility, biodegradability, and good mechanical properties which make them have the potential to be used as a biomedical material. The main objective of this paper is to investigate corrotion rate and morphology after corrotion of biocompatibility of implant-based alloys Mg-Ca-Zn with CaCO3 as a foaming agent. Mg-Ca-Zn Alloy was made by the method of powder metallurgy with the addition of CaCO3 as a foaming agent with three variations of composition (96Mg-Ca-3Zn-CaCO3, 91Mg-Ca-3Zn-5 CaCO3, and 86Mg-Ca-3Zn-10 CaCO3 wt%). Sintering process was carried out at 600 °C and 650 °C with a holding time of five hours. Corrosion test was performed using G750 Gamry Instrument in accordance with ASTM standard G5-94. Simulated body fluid electrolyte used is Hank's solution with a pH value of 7.4 and a temperature of 37 °C. Then the analysis of the microstructure after corrosion test was conducted using scanning electron microscopy (JEOL, JSM-6390A Japan) equipped with energy dispersive spectrometry data (EDS). Alloy corrosion rate of Mg-Ca-Zn-CaCO3 increases with the amount of CaCO3 in the alloy and the temperature rise in the sintering. From the test results, the smallest corrosion rate is in the alloy 91Mg-Ca-3Zn-CaCO3 at 600 °C sintering (58.3045 mpy) and the highest occurs in alloy 86Mg-Ca-3Zn-10CaCO3 at 650 °C sintering (91.4007 mpy). Surface morphology of the alloy after the corrosion process is the type of volcano. This localized corrosion occurs where an electrochemical reaction takes place to form a distinctive structure with a circle and a hole in the middle.

EFEKTIVITAS METODE NONDESTRUKTIF NIR-JARINGAN SARAF TIRUAN DALAM MENENTUKAN KOMPOSISI KIMIA JAGUNG Harmi Andrianyta; I Wayan Budiastra
Widyariset Vol 13, No 2 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

High maize production should be followed by good handling and preservation up to consumer. Near Infrared Reflectance (NIR) was nondestructive testing method, as well as high accuracy, free from pollution, and rapid method, therefore suggested as a testing method. The objective of this study was asses of NIR technology efectivity in determining four major compositions of maize. Fifty samples of maize (intact seeds) were scanned from 900-2000 nm NIR wavelength, interval 5 nm. Calibration model for NIR measurement using Artificial Neural Network (ANN) technique three layers. As input layer ANN are 5, 10, and 15 nodes principal component (PC), hidden layer 4,6, 8, 10, and 12 nodes and output layer are single chemical composition and simultaneously. Prediction of an external validation set showed low the SEP (standard error of prediction) and CV (coeficient of variability). As result, NIR technology is able to predict maize chemical composition accurately SEP ranged from 0.004-0.496, CVranged from 0.047–0.518. ANN with 5 nodes input layer and single output layer were very strong recommended to generate NIR calibration model.

MARKETING SECTOR DEVELOPMENT AS SUPPORT FOR FISHERIES INDUSTRIALIZATION (CASE STUDY: TILAPIA FISH IN MUSI RAWAS DISTRICT, SOUTH SUMATRA) Hertria Maharani
Widyariset Vol 18, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

Fisheries industrialization announced by the Ministry of Marine and Fisheries Affairs aims to increaseproduction, productivity, and value added of fishery products. However, increased production without increasingmarketingefforts will make less successful impact for the program. This research examines the aquaculture, market,channel marketing, and trading of tilapia from Musi Rawas, South Sumatra. Field studies were conducted inMarch–June 2012. Survey method was used as the main instrument of this study, with the help of questionnairesand in-depth interviews with key informants. Respondents consisted of farmers, collectors, traders, and policymakers related tilapia. Descriptive analysis was conducted for the method of analysis. Results of the study showedthat despite an increase in production experienced by farmers, commodities are marketed only to the local market.Farmers are still the price takers which means they cannot increase the bargaining power. The structure of farmersmarkets are perfectly competitive, while the structure is oligopsonistic merchant. So the prices at the level of farmersare controlling nature merchants. To improve the welfare of farmers aquaculture, should diminishing patronclient relationship and search for new marketing channels need to be done as the customer looking for a restaurantor doing marketing tilapia up to another area.

ANALYSIS OF THERMAL AND AERODYNAMICS PERFORMANCE OF BATAK TOBA TRADITIONAL HOUSE BY IMPLEMENTING DIGITAL SIMULATION AND FIELD MEASUREMENT Yuri Hermawan Prasetyo
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Traditional house is believed to have a better thermal performance compared to the modern house. Utilization of passive design in buildings can refer to the passive system used in a traditional house through natural ventilation and local materials application. Digital simulation was used to evaluate the thermal performance of the Batak Toba Traditional House by comparing field measurement data; and as a validation tool. This study aims to determine the thermal and aerodynamic performance of Batak Toba Traditional House by using digital simulation and field measurements. The used method was by comparing the results of digital simulation analysis with indoor and outdoor direct temperature measurements of the Batak Toba Traditional House. The softwares used for simulation were Meteonorm, Ecotect and CFD-ACE+. The measurements were conducted for 24 hours in May 4th-5th and April 26th-27th 2013 within one hour time interval. The results of the analysis of digital simulation show the same phenomenon compared with the result of field measurement that is 80% in range thermal comfort within one year. Field measurement results showed that the thermal conditions resulted from all day field measurement was under the upper limit temperature reference of thermal comfort with natural ventilation, that is 29 °C.

KEKUASAAN PRESIDEN (Studi Komparatif RI dengan Beberapa Negara Maju) Abdul Ghoffar
Widyariset Vol 13, No 1 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

The Presidential power after the amandment of 1945 Constitution has decreased. Many people think thatsuch decreases are excessive because in practice, majority of the president’s policy requires approval of the Parliementary,making the President has difficulty in running the government. To avoid confusion, the researcher isinterested in conducting research related to the presidential power of the President of Indonesia compared to thepower of head of state/and or head of government in eight developed countries, namely the United States, Russia,Japan, China, Kuwait, Australia, and South Africa. In conducting the research, the researcher uses reseach methodsof juridicial, historical and comparative approaches. The result of this study indicates that Indonesian Presidentialpower is quite enormous compared to the power owns by the head of states and / or head of governments in theabove mentioned countries. Only Kuwait Amir’s power can defeat Indonesian Presidential power. The power ofKuwait Amir is similar to Indonesian Presidential power before 1945 Constitution amandment.

SIMULASI OPTIMASI PENGUKURAN STATE OF CHARGE BATERAI DENGAN INTEGRAL OBSERVER Asep Nugroho; Estiko Rijanto
Widyariset Vol 17, No 3 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

The accuracy of state of charge (SoC) measurement has been an important key in the design of Battery Management System (BMS). A SoC measurement can prevent the battery from both overcharged and undercharged condition. One of the conventional methods for SoC estimation is coloumb counting (CC). This method has a drawback regarding to the accumulation of error propagation. To improve the accuracy of CC method, the integral observer could be added. In our work charge-discharge data simulation generated by PSIM was used to test the Integral observer performance. This research used general lithium-ion battery. It was found that this approach could significantly correct the error from the numerical integral calculation and discrete data input. The error of CC method at 4000 sec was found to reach 25%; however the error propagation could be decreased up to less than <3% by Integral observer.

ORGANIC AND ANORGANIC TECHNIQUE OF FERTILIZATION TO INCREASE OF PALU’S SHALLOT PRODUCTIVITY Ruslan Boy
Widyariset Vol 14, No 2 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Palu’s shallot is commercial crops. The productivity of Palu’s shallot is still a lower compared to that in regional crop which was achieved of 6,1 t/ha. In addition, this production is still lower compared to the national productivity (20 t/ha). This research was aimed to study the application of organic and inorganic fertilizers in the productivity of Palu’s shallot. The study was arranged in a randomized block design with 5 treatments and 4 replications. This study was performed on farm of fearmer’s land at Guntarano village of Tanatovea sub-district of Donggala district. The treatment consisted of ZA 100 kg/ha + NPK (P0), compost of cow excrement 10 t/ha (P1), compost of chickeent excrement 5 t/ha (P2), compost of goat manure 5 t/ha (P3), compost of cow excrement 5 t/ha + ZA 50 kg/ha. Result indicated that all treatments showed not signifi cant on vegetative growth of local Palu’s shallot. However, there was a signifi cant effect among the fertilizer treatments on increasing of Palu’s shallot productivity. It was found that the weight of wet tuber showed higher than in P4 (14.42 t/ha) and in P2 (10.90 t/ha).

Page 28 of 48 | Total Record : 476

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Andri Rahman

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andri.agus.rahman@lipi.go.id

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Pusbindiklat LIPI, Jl. Raya Bogor Km. 46, Cibinong Science Center, Cibinong - Bogor 16911

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Kab. bogor,

Jawa barat

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