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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 21 Documents

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Search results for , issue "Vol 12, No 1 (2009): Widyariset" : 21 Documents clear

SYNTHESIS OF PHENOLIC FORMALDEHYDE RESOLE RESIN AS WOOD ADHESIVE USING 13'0 OIL Siti Nurul Aisyiyah Jenie
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Resin jenis resol fenol/formaldehid memiliki aplikasi yang sangat luas dalam bidang teknik kimia, mulai dari insulasi termal hingga sebagai bahan adhesif dalam industri kayu. Resin ini memiliki keunggulan sifat fisis yaitu tingginya ketahanan terhadap kelembapan dan cuaca, yang selanjutnya berguna dalam penggunaan konstruksi luar dan lembap. Sekarang, telah dikembangkan teknologi-teknologi baru untuk memproduksi bahan adhesif kayu dari bio oil. Resole resin dibuat dengan mereaksikan antara fenol dengan formaldehid, di mance 50% dari fenol yang bereaksi disubstitusi oleh fraksi fenol/netral yang diekstraksi dari bio oil. Dalam penelitian ini, lima macam komposisi reaktan digunakan untuk membandingkan kualitas dan sifat fisis masingmasing resin. Setiap resin memperoleh perlakuan yang sama selama sintesis. Hasil dari penelitian ini kurang memuaskan, semua sampel gagal merekatkan kedua permukaan kayu. Akan tetapi, resin yang memiliki kualitas rendah ini dapat diatasi dengan beberapa modifikasi menggunakan bahan aditif.

ANALISIS KEHANDALAN STRUKTUR BANGUNAN WISMA ATLIT RAGUNAN PASCA KEBAKARAN Muhammad Rusli
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The data acquisition of the post-fire construction is done by visual observation, dimension measure-ment, concrete field testing and also laboratory testing. Visual observation above the third floor which is directly on fire, indicate serious damages with the result that all of the building component above the third floor must be replaced by a new construction. The testing of building material shows that the grade of concrete component which is directly fired has fc '=6.8 MPa, while the non-fired component has fc'=15.2 MPa. The structural analysis shows that most of the building components at the first and the second floor are able to be functioned with a little repair of longitudinal balk at their support section to increase bending capacities.

PENGARUH FLARE DAN CORONAL MASS EJECTION (CME) TERHADAP INDEKS Dst GEOMAGNET DAN FoF2 IONOSFER DI ATAS TANJUNGSARI SUMEDANG Tiar Dani
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

This research was conducted to see the effect ofsolarflare and Coronal Mass Ejection (CME) on geomagnetic and ionosphere above Tanjungsari, Sumedang, West Java. By using Disturbance storm time (Dst) index data for geomagnetic disturbance parameter and critical frequency (fo) of F2 ionosphere layer data for ionosphere disturbance parameter; a graph was plotted between occurrence off lare and CME with Dst index andf oF2 from year 2000 to 2003. The result found thatf lare and CME affect disturbance on geomagnetic caused a geomagnetic storm and disturbance on ionosphere cause an ionosphere storm. Those storms were depended by flare class, CME type, and its position on the sun when they happened Flare and CME event that happened also required time to reach the Earth.

PENELITIAN KEKUATAN STRUKTUR SIRIP ASIMETRI ROKET SPIN TERHADAP PERBEDAAN GEOMETRI Lidia Kristina Panjaitan
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Spin rocket represents one of the rockets that are designed to be able to reach bigger trajectory and accuracy of target. However it was required to be reckoned the influence of unsymmetric fin platform structure, which its most optimal performance by the effect of loading aerodynamic. By examination of structure strength through loading of bending moment with simulation of NXNASTRAN / FEMAP four unsymmetric fin design, so that maximum tension, minimum tension, tension around loading area and influence form fin plafform could be obtained.

TRANSFORMASI GEN ARABIDOPSIS ASYMETRIC LEAVES2 (AS2) PADA ANGGREK PHALAENOPSIS AMABILIS (L.) Blume DENGAN MEDIATOR AGROBAKTERIUM TUMEFACIENS Vincentia Esti Windiastri; Endang Serniarti
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The Asymmetric leaves2 (AS2) gene is an important gene of a model plant, Arabidopsis thaliana, that involved in leaf development. To understand the molecular mechanism of leaf development in orchid, we transformed the AS2 gene into the Phalaenopsis amabilis orchid protocorms (developing orchid embryos). Agrobacterium tumefaciens LBA4404 that contained T-DNA with 355:: AS2 construct and pGreen vector were used for transformation. The-21-day-old protocorms that co-cultivated with Agrobacterium culture containing pG35S::AS2/LBA 4404 and pG35S/LBA4404 were maintained on 100 mg/1 kanamycin containing medium. The growing plants were selected as candidate of transformants. The putative transformants were analysed by PCR with a pair of AS2 gene specific primers (ORF15 F2 and ORF I 5 R2), that amplifying 600 by fragment of AS2 gene. The result showed that 79 plants out of 7966 protocorms transformant p35S: : AS2 and 64 plants out of 4622 protocorms transformant pG35S were kanamycin resistants, the efficiency of transformations were 0.99% and 1.38%, respectively. Phenotype characterization of the transformation showed that they produced various abnormal leaves shapes: oval (34.18%), wildtype-like (30.38%), rectangular (26.58%), lobed (3.80%), fused (2.53%) and trumpet (2.53%). These data indicate that abnormal shape of leaves might be due to the expressions of AS2 transgene in P amabilis.

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.

EFEKTIFITAS PEMASANGAN ABSORBER TERHADAP KALIBRASI MEDAN ELEKTROMAGNET OPEN STRIPLINE Priyo Wibowo
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The effectiveness of 4cm x 4cm x 4cm pyramidal absorber lining arrangement on stripline field strength calibration has been studied in the EN 55020 laboratory at Testing Technology Division, P2SMTP-LIPI. The calibration procedure refers to CISPR 20 using Toyo IM5/A software at 84 frequencies from 0.15 -150 MHz. The number of calibrations is the representation of absorber combination number. This is needed to get the value of. RF voltage stripline average deviations depending on absorber number. The result of the data analysis shows that the maximum decreasing of average deviation voltage is 11.186%. However such installation still gives average deviation 0.689dB above deviation limit of ± 2dB.

PEMODELAN SENYAWA PHALERIN BERTANDA 125I UNTUK UJI ANTIRADANG Wening Lestari; A Mutalib
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.12.1.2009.127-132

A model of 125I-phalerin was designed in this research. The work was started by designing phalerin based on available data and followed by minimizing energy at bond angles, i.e C4-05-C7-C8 (0 ) , C5-C7-C8-C9 (2),C3-014-C15-C20 (3) and C4-C3-014-C15 (4).This work was then continued with designing of 115l -phalerin. Both models were put in overlaid position, then they were characterized. Result showed that phalerin model has characteristic of bond angle with 1 z 3, 4= 40°, 40°, 320°, 280° respectively. Energy ofphalerin model was 18,7625 kkal/mol. "51-phalern has similarity conformation with phalerin and the RMS for bond length, bond angle 0.0091 a and 0.5039° respectively.

DETERMINASI CESIUM-137 DARI AIR LAUT MENGGUNAKAN RESIN HEKSASIANOFERAT Murdahayu Makmur; Heru Umbara
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.12.1.2009.95-100

Determination of cesium-137 in seawater was done using the hexacyanoferrate resin as ion exchanger from 3 point samplings of surface seawater. The hexacyanoferrate ion exchanger matrix was prepared by performing the reaction ofsilica gel supported with potassium hexacyanoferrate and copper (II) chloride. In order to test the performance of the ion exchanger, a batch experiment was performed. A known activity of cesium-137 was used to spike seawater then the hexacyanoferrate resin was added. The separated hexacyanoferrate resin was then counted with gamma spectrometer The cesium-I 37 concentration used in the work varies between 0.5 Bq-20 Bq while the results of the adsorbing efficiency varies between 58-96%. In time variation between 0.5-20 minutes, the adsorbing efficiency varies between 77-96% with highest efficiency at contact time 60 minutes. The hexacyanoferrate ion exchange columns were used to process the Jepara's seawater The calculated cesium-137 activities were 1.37 Bq/m3-2.76 Bq/m3.

MODIFIKASI PEMBENTUKAN LAPISAN Zn PADA PERMUKAAN BAJA DUAL FASA DENGAN NITRIDASI RINGAN Arbi Dimyati
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.12.1.2009.57-64

In this work an experimental series was performed in order to modify the surface properties and galvanise ability of the dual-phase steel by the nitriding in an ammonia containing atmosphere (bright nitriding) during re-crystallisation annealing. The samples were characterized using various electron microscopy techniques and special preparation methods. The investigations show that during re-crystallization annealing with a relatively short duration because the nitrides formation with a large amount of nitrogen atoms can incorporate into the surface near area of the steel. The steel microstructures and the oxidation behavior of the alloying elements on the steel surface are positively changed. The decreasing of oxidation causes the surface activation that increases the steel/zinc reactions during hot-dipping. The formation of the Fe7415 inhibition layer also changes. The best quality of the zinc layer surfaces are achieved on the samples after annealing with ammonia concentration between 0.25 and 1 vol.-%. Therewith a new alternative for controlling the hot-dip galvaniseability of highstrength steels are proposed.

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Contact Name
Andri Rahman

Contact Email
andri.agus.rahman@lipi.go.id

Phone
-

Journal Mail Official
widyariset@mail.lipi.go.id

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

Location
Kab. bogor,

Jawa barat

INDONESIA