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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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PERAN PENYIDIK PEGAWAI NEGERI SIPIL (PPNS) PERIKANAN DALAM PROSES PENEGAKAN HUKUM KASUS IUU FISHING DI INDONESIA Freshty Yulia Arthatiani
Widyariset Vol 17, No 1 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

This study aimed at describing the role of Fisheries Civil Servant Investigators (PPNS) in the law process of Illegal, Unreported and Unregulated (IUU) fishing in Indonesia. It utilized a descriptive qualitative method to analyse the primary and secondary data, which had been collected through interviews, observations and FGDs from a purposively chosen sample with a juridis normative approach. Definitively, IUU fishing is the act of fishing within the Indonesian, other country’s jurisdiction, or the open waters without permit, not reported, and not regu- lated. The law No. 45 year 2009 concerning the amendment of Law No. 31 Year 2004 on Fisheries stated that there are three sorts of law enforcers who have the rights to conduct investigations on offense in the fisheries sectors: the Civil Servant Investigators, the Navy Investigating Officers and the National Police Investigators. Despite the fact that the Civil Servant Investigators have been playing an active role in the law enforcement, especially for the IUU fishing cases, the function has not yet been very effective due to the lack of inter-institution coordination as well as communication among the law enforcers. Hence, matching perception, investigation mechanism as well as enforcement among the law enforcers are of utmost importance to alleviate the effectiveness of combat against IUU Fishing in Indonesia.

DETERMINATION OF OIL EXTRACTION RATE FROM Spirulina sp. AND Chlorella sp. BY USING CELL DISRUPTION TECHNIQUE Susiana Melanie; Diini Fithriani
Widyariset Vol 1, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

Oil derived from microalga has a big potential to substitute fossil fuel so that the oil extraction method needs to be developed. This study aims to compare the method for cell disruption in oil extraction of Spirulina sp. and Chlorella sp. microalgae. Spirulina sp. and Chlorella sp. were cultivated each in a pond with maximum capacity of 600 liters at Biotechnology Laboratory of Research and Development Center for Marine and Fisheries Product Processing and Biotechnology. Spirulina sp. were harvested by filtered it using satin. Chlorella sp. was harvested using coagulant NaOH, so it was needed to be neutralized to pH 7 with citric acid addition. The cell wall of Spirulina sp. and Chlorella sp. then was ruptured using sonicator and microwave, while other sample without disruption as control. The suspension then was macerated with n-hexane solvent, to extract the oil content. Oil content of Spirulina sp. which has been collected from this experiment gave result control: microwave: sonicator as 1.17%, 1.28%, and 1.97% respectively. Meanwhile, oil content of Chlorella sp. gave result from control, microwave, and sonicator as 0.93%, 1.20%, and 1.69% respectively. It was concluded that sonicator is the best method in oil extraction of cultured microalgae.

PERFORMANCE TEST OF DUAL FUEL ENGINE USINGETHANOL DIESEL Yanuandri Putrasari; Arifin Nur; Aam Muharam
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Diesel engine is a high thermal-efficient of internal combustion engine. However, the application of diesel engine still depended on fossil fuel. This fuel has limited availability and the effect are also very dangerous especially its emission. Ethanol was used as an alternative fuel to replace fossil based of diesel fuel. The purpose of this work is to explore the performance of the dual fuel engine–ethanol diesel. The performance test was carried out by running the indirect injection engine that modified to direct injection on 1,500 rpm using four types of fuel i.e. diesel fuel, diesel mixed with ethanol2.,5%, 5%, and 10%. The results show that there was an increasing effect of engi inindicated mean effective pressure (IMEP) value and brake specific fuel consumption (bSFC) reduction when the engine was operated using ethanol diesel fuel blends. The emission of hydrocarbon (HC) tends to increase, while the emission of smoke and carbon monoxide (CO) were decreased when the engine was operated using dual fuel–ethanol diesel.

PROYEKSI DATA MURID SMP MELALUI PENDEKATAN TEORI SISTEM MATEMATIKA DI PUSAT STATISTIK PENDIDIKAN, BALITBANG, DEPDIKNAS Ikrar Pramudya
Widyariset Vol 12, No 3 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

This study discusses the application of the mathematical system theory in projection of data, especially educational data. This study is done by doing discussion of relevant theory and the appropriate mathematical system models. The result of the study is the existence of mathematical system model fitting in with requirement of projection of data and projection technique for n variable done simultaneously. Excess from projection of data with this approach is a consistent result of calculation and measurable error ofp rojection.

THE PROPERTIES KRAFT PULP SENGON WOOD (Paraserianthes falcataria):Differences Of Cooking Liquor Concentration and Bleaching Sequence Widya Fatriasari; Lucky Risanto
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

The research was to investigate the difference effect of cooking liquor concentration and bleaching sequence on the properties Kraft pulp sengon wood (Paraserianthes falcataria). The Kraft pulp conditions were alkalinity (16 and 20%) and sulfi dity (20 and 25%). The maximum pulping temperature was 170°C for 4 hours, Liquor to wood ratio of 4:1 and 100 gram OD. Pulp bleaching sequences were P1 DEP2 and D1ED2P. Utilization of selected Kraft pulping was effective enough for dissolving lignin. The highest and the lowest lignin decreasing were 90% and 61% respectively. The increasing effect of alkali concentration was more dominant than its sulfi dity on the pulp delignifi cation selectivity. Generally, the optimum Kraft pulping conditions were alkalinity 20% and sulfi dity 25%. The sequence bleaching difference of the selected pulp tended on the decreasing of kappa number and pulp yield. The fi rst pulp bleaching method (P1EDP2) was relatively better than the second method (D1ED2P)

ANALISYS OF AIR POLLUTER SO2, NO2, AND HC BY USING LINE SOURCE MODELING APPROACH (CASE STUDY AT JALAN MAGELANG YOGYAKARTA) Ahmad Zaky Maulana
Widyariset Vol 15, No 3 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

This research discuss the issue of air pollution caused by movable emission in Jalan Magelang, Yogyakarta.The objective of this research is to estimate the weight of emission resulted from motor vehicle pollution. Tocalculate polluter concentration, this research use line source modelling. The result shows that the bigger polluterconcentration is NO2 that reach 211,342 μg/m3 in the daytime. The bigger polluter contributer are pick up/trucktype vehicles. The heaviest polluter weight is NO2 that reach 299 ton/year.

PENGARUH KARBON MONOKSIDA TERHADAP OZON PERMUKAAN Novita Ambarsari; Ninong Komala; Afif Budiyono
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Surface ozone is one of air pollutant that can be very dangerous for human health and many other aspects of the living things. The effect of carbon monoxide (CO) to surface ozone formation has been studied. We used Dasibi Monitor Ozone and Horiba Ambient Carbon Monoxide Monitor to measure surface ozone and carbon monoxide concentration at air pollution monitoring station belong to LAPAN Bandung along 2008. The result shows that carbon monoxide affecting 20%–80% formation of surface ozone with negative correlation. A normal photochemical reaction is the main factors. Daily variation of surface ozone shows lower concentration occur in the morning and night, and higher concentration occur in the evening. While, daily variation of CO shows maximum concentrationin the morning and night, and lower in the evening.

GROWTH AND YIELD OF Eucalyptus grandis HILL EX MAIDEN AT AEK NAULI SIMALUNGUN NORTH SUMATRA Aswandi Aswandi
Widyariset Vol 14, No 2 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Sustainable forest management need an effective yield regulation. This is depend on precision of growth and yield prediction on determination of rotation, harvesting intensity, thinning regime and another silviculture option. The objective of the study was to develop growth and yield model and deﬁ ned optimum cutting rotation for Eucalyptus grandis Hill ex Maiden timber estate at Aek Nauli Simalungun North Sumatra. Current growth estimation and yield prediction models were studied using data from 15 permanent sampling plots. Data from annual measurement were used to formulate the models which include stand diameter and height function, basal area and stand volume function. Site quality was calculated using site index equation SI = H*{(1+10.03*e)/(1+10.03*e. This equation was developed based on relationship dominant height with stand age. Site index in that region have varies from 18.99 to 35.26. According on interception of curva Current Annual Increment (CAI) and Mean Annual Increment (MAI) were deﬁ ned optimum cutting rotation at 6 year. Volume yield at this end rotation is 165,24 m -0.59*1/83/hawith MAI (Mean Annual Increment) 27,54 m /ha/yr. Yield prediction model were developed by regression analysis. The optimum of equations of mean of diameter, height, basal area and stand volume showed as follow: a. Stand dbh model : ln D = 0.743 + 0.363 ln A + 0.142 lnS + 0.313 ln B; b. Stand mean height model: lnH = - 0.206 + 0.247 lnA + 0.100 lnB + 0.822 lnS; c. Volume yield model : ln V = - 1.96 + 0.526 ln A + 0.548ln B + 1.38 ln S. Where D : dbh (cm), H: mean height (h), V : stand volume (m33 ha), A : age (yr), B: basal area (m), and S : site index. 2-1-0.59A

EFFECTIVITY OF HOUSING REGULATIONS IN INDONESIA TO SUPPORT HOUSING PROVISION FOR LOW INCOME COMMUNITY Bramantyo Bramantyo
Widyariset Vol 15, No 1 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

The housing problems in Indonesia are related to low-income community such as backlog, sub-standard houseand slum settlement, which are caused by the ineffectiveness of housing regulations. This study was conducted toevaluate the existing housing regulations in order to support housing provision for low-income community. Thestudy was conducted with qualitative approach, by evaluating the Housing Law No. 1/2011, Housing Law No.4/1992, Minister of Housing Regulation No. 3/2007, and Minister of Housing Regulation No. 10/2011. The resultshowed that the new housing law was already accommodated the housing provision for low-income community.Nevertheless, many problems on the implementations were related with the commitment and budget capacity oflocal government. Meanwhile, the limitation standard of low-income community (IDR 2,5 M) was 35% higher thanaverage income of Indonesian people, and the standard price of social house (IDR 25 M) which had standard size(36 m2) was 44 % lower than the market price. These had resulted in the ineffectiveness on the implementation ofthe regulation. The conclusion was that the existing housing regulation was fair effective to support housing provisionfor low-income community, but it was still had weaknesses associated to low-income community limitationstandard and social house standard price.

PERILAKU SENSITASI PADA LOGAM STAINLESS STEEL SERI J4 AKIBAT PERLAKUAN PANAS Gadang Priyotomo; I Nyoman Gede Putrayasa A
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

The failure of austenitic stainless steel during the industrial aplications is place sensitization due to heat treatment. The investigation of that failure has been investigated by researchers in particular for stainless steel 2XX and 3XX types, while there isno or little investigation for stainless steel J4 type.Furthermore, the investigation of the presence of sensitization on stainlees steel was conducted by referring to American Society for Testing and Materials (ASTM) A262-02a, which the caracterization of metal surface morphologies dan chrom content used optical microscope andscanning electron microskop, and Energy-dispersive X-ray spectroscopy, respectively. The results elucidate that sensitization is produced in temperature range from700oC up to 900oC .There isgrain boundaries attack onsurface morphologies after sensitization test in the temperature range from700oC up to 900oC ,whichis unlikely to happenat temperature of 600oC. The possibility of chromium difusion to grain boundaries took place from the decrease of chromium content adjancent with grain boundaries and the increase of chromium content in grain boundaries, whichimplies the formation of intermetallic compound of carbide.

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Andri Rahman

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andri.agus.rahman@lipi.go.id

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

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Kab. bogor,

Jawa barat

INDONESIA