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Widyariset

widyariset
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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 14117932 EISSN : 24610976 DOI : -

Core Subject : Engineering,

Engineering

Widyariset is a scientific journal which publishes the results of research and development, assessment and systematic thinking about science and technology. The writers of the scientific papers in this journal come from researchers/researcher candidates from various institutions' research and development (R&D), and universities. Widyariset is published regularly three times a year: in April for the issue of Social Sciences and Humanities (IPSK), in August for the issue of Natural Sciences (IPA) and in December for the issue of Engineering Sciences (IPT).

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Articles 21 Documents

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

PENGOLAHAN LINDI TPA DENGAN METODE KOAGULASI DAN OZONASI Latin Hanum Lalasari; Enjarlis Enjarlis
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Landfilling of municipal waste is a major problem of the waste management system in Indonesia. The generated leachate must be appropriately treated before being discharged into the environment because it ivas toxic. The aim of this research was to compare the coagulation, ozonation, coagulation-ozonation, and ozonation- coagulation processes of landfill leachate at TPA Bantar Gebang Bekasi, to classify the result of landfill leachate treatment, and to provide an efficient methodf or the treatment ofleachates, in order to reduce pollutants' content to concentration values lower than the corresponding limits. The variables selected in this research were types of coagulant, dosage of coagulant, and time duration of ozonation process. Parameters selected in this research were colour, taste, pH, Chemical Oxygen Demand ( COD), Total of Suspended Solid ( TSS), Chloride ion (Cl) and ammonia ion( NH4+). The result of research have shown that the best optimum method of landfall leachate treatment was coagulation-ozonation combination process using FeC13 0.25% as a coagulant and a ozonator (0.25 g 03//h) for 75 minutes at pH of 9. The process succeed to degrade the value of COD, Cl, NII; were about 90,91%, 13,45% , 6,68%, respectively and category of B grade for treated leachate.

EVALUASI PETA PERCEPATAN GEMPA SUMATERA (SNI-1726-2002) TERHADAP PETA PERCEPATAN GEMPA MENGGUNAKAN SOFTWARE PSHA Fahmi Aldiamar
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Evaluation on seismic hazard map in Sumatra bedrock was needed because the Indonesian seismic hazard map standard (SNI-1726-2002) was built using the 2D seismic source model and a lot of seismic activity around Sumatera occurred after the 8N1-1 7 26-2002 was published. Probabilistic Seismic Hazard (PSHA) software was developed by USGS in 2007 to gain bedrock acceleration value derivedf rom Probabilistic calculation on 3D seismic source using the Next Generation Attenuation (NGA). Therefore this software represented the newest theory to build seismic hazard map and it was used in this research to evaluate and validate the Indonesian standard, particularly Sumatra seismic hazard map. Several phases were done to gain the seismic hazard map, such as collecting and processing earthquake data, calculating seismic risk parameter, acceleration calculation using PSHA software and developing a seismic hazard map using ArcGis Software. Evaluation result indicated that SNI-1726-2002 seismic hazard map in Sumatera bedrock, particularly in region 3,4 and 5 was lower than seismic hazard map developed using PSHA software. The deviation was range between ± 0.05-0.20g.

STUDI PALINOLOGI FORMASI MENTAWIR, SUB CEKUNGAN KUTAI BAWAH, KALIMANTAN TIMUR Christina Ani Setyaningsih
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Palynological study of the Mentawir Formation, Lower Kutai Basin, East Kalimantan has been conducted on the 27 selected cutting samples of the 'X' Well in the depth of interval 100'-4.140 'which is situated in 'DNA' Field The purpose of this study is to determine the age and depositional environment and biostratigraphic sequence of the sediment. The age of the sediment is primarily marked by the last appearance of Florschuetzia trilobata at 850', range from Middle Miocene to Late Miocene. The Middle Miocene age occupies sediments from interval 850'-4.140 , whilst the Late Miocene age covers sediments from interval 100'-850'. Delta environment of the interval samples were deposited in lower delta plain (distal) to the delta front (distal). Based on the changes on the amount of the taxa group in the mangrove and freshwater ecology as well as the changes in the sedimentation, thus the biostratigraphic sequence of the 2 X2 Well with depth of interval 100'- 4.140' in 2 DNA2 field lies in the Transgressive System Tract to the Highstand System Tract.

EFEKTIVITAS PEMUTUSAN MULTIWALLED CARBON NANOTUBES (MWNT) DENGAN MENGGUNAKAN HIGH ENERGY MILLING DAN CONVENTIONAL BALL MILLING Nono Darsono
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The cutting efficiency of MWNTs was compared systematically between conventional ball milling and high-energy milling. The efficiency of both processes was evaluated in term of dispersion properties, aggregates size evolution, and degree of crystallinity. Two-hour high-energy milling produced a large portion of MWNTs smaller than 150 nm, while even 120-hour ball milling struggled to achieve smaller than 300 nm. It was revealed by the significantly viscosity value. Since the high-energy milling viscosity was much higher than ball milling, 2-hours high energy milling exhibited lower damage on the MWNTs thread than the 120-hours ball milling according to the I /I ratio and values of raman spectra were 3.63 and 2.81 for high energy milled and ball milled respectively.

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.

POTENSI PENGINDUKSI APOPTOSIS SENYAWA NIKOTINIL DIBUTIL GLUTAMAT ESTER TERHADAP SEL KANKER T47D Chandra Risdian; Tjandrawati Tjandrawati; Muhamad Hanafi; Yulia Anita; AMJ Putra
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Nicotinil Dibuthyl Glutamate Ester (NDBGE) is a synthetic compound that is an analog of antibiotic UK3A from mycelium of Streptomyces sp.517-02. This compound was estimated to have anticancer activity similar to UK-3A. The aim of this research was to know the NDBGEs apoptotic inducing potency to human breast cancer T47D in vitro. DMEM + 1% PS + 10% FBS was added to human breast cancer T47D cells until cell concentration reached 1-5x/ 05eells/ml. NDBGE then was diluted by DMSO until 100ppm concentration. Propidium iodide with 50pg/m1 concentration was added to the T47D cells. The analysis was conducted by flow cytometry method. The result was that the apoptosis percentage of the cells was 12,35%.

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.

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.

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Contact Name
-

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widyariset@mail.lipi.go.id

Editorial Address
Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA