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Published by Pusbindiklat Peneliti LIPI

ISSN : - EISSN : 24610976 DOI : 10.14203

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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

ANALISIS ANOMALI SINYAL ULTRA LOW FREQUENCY (ULF) GEOMAGNET SEBELUM TERJADI GEMPA 29 SEPTEMBER 2004 DI BIAK Fitri Nuraeni
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Ultra Low Frequency (ULF) anomalies on geomagnetic variation data can be caused by external disturbances such as from the sun or space and internal disturbances from the earth. Before the 5.4 Richter Scale earthquake at Biak on September 29, 2004, there are anomalies that might be caused by electromagnetic emission from the earth's inner layer. These anomalies have been detected on geomagnetic signal in ULF band (10 — 600 sec periods). This paper will discuss the anomaly that was detected before the earthquake, and whether it was a local event within the earth's inner layer that happened because of the earthquake's preparation phase or was it actually caused by external disturbances. Data that is being used is the H and Z component of geomagnetic data variation. The Fast Fourier Transform method (FFT method) is being used to process the geomagnetic signal so the data can be filtered by bandpass filter. The Z/H polarization method is being used to analyze the result. Dst and Kp indices are also used to determine whether the anomaly is caused by external or internal disturbances.

PERHITUNGAN TEMPERATUR KELUARAN DAN MASUKAN PENDINGIN PRIMER DAN SEKUNDER PB-BI DI INTERMEDIATE HEAT EXCHANGER Epung Saepul Bahrum
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Analyze of intermediate heat exchanger in Pb-Bi cooled nuclear reactor for hydrogen production design have been done. Based on one dimensional convective and conduction heat transfer model, temperature distribution ofprimary and secondary Pb-Bi at IHX have been modeled. Heat transfer coefficients ofprimary and secondary Pb-Bi coolant are calculated by sub channel analysis method. Primary and secondary Pb-Bi coolant temperature distribution obtained by solving numerically first orders differential equation using Runge-Kutta- Gill method Incase primary coolant flow rate 7000 kg/s and IHX inlet temperature 552°C, outlet temperature and flow rate of Pb-Bi secondary coolant are 542°C and 2700 kg/s. The temperature secondary coolant 542°C corresponds to chemical reaction temperature of steam membrane reforming.

PERANCANGAN SISTEM KUNCI ELEKTRONIK BERBASIS MIKROKONTROLER AT89C52 Briliant Adhi Prabowo; HerIan HerIan
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The access security awareness using conventional keys was less practical and much risky of leaving or even loosing the keys. Besides, access can not be locked automatically whenever the authentic user forgets to lock the door. The purposed of this research was to develop the electronic lock system design using personal identification number (PIN). Using PIN as an access key will give an easier method for the authenticated user without decreasing security level, and also it is more practical and easier since the authentic user doesn't need any key at all. This electronic lock design uses microcontroller AT89C52 for main control of the system which could be implemented on restricted area like laboratories or residences as well. More than 6000 PIN data can be saved in the serial memory 24LC65, and it will be accessed when the user enter the correct PIN.

PENINJAUAN NIETODE PERHITUNGAN AWAL BULAN KAMARIAH KRITERIA MUHAMMADIYAH DENGAN KAJIAN ASTRONOMI Arief Sasongko Adhi
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Muhammadiyah has long used a method which is based on the calculation of the conjunction of the Moon and the Sun to determine the beginning of Islamic months. If the conjunction happens before sunset and sunset happens before moonset, then the next day is the beginning of an Islamic month. Such a method often produces dates of the beginning of Islamic months which are earlier than the actual visibility of the lunar crescent. This research was conducted to compare the determination of the beginning ofIslamic months produced by different criteria. The criteria compared were Muhammadiyahs', Lapan's, SAAO's, and Odeh's. Astronomical data needed were obtained from Accurate Times 5.1 software for Cibinong area as the location of reference. Calculations were performed to determine the beginning of Islamic months starting from Sha'ban 1429 until Shawwal 1430. Comparison of the dates produced by the four criteria shows that those calculated by Muhammadiyah .'s criterion yielded in five differences out of 15 data points observed. It calls for a review on the criterion.

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.

PEMBUATAN HIT RADIOLVIVIUNOASSAY (RIA) MIKROALBUMINURIA DENGAN METODE COATED TUBE : PERBANDINGAN TABLING POLISTIREN "PLAIN" DAN "DASAR BINTANG" V. Yulianti Susilo; Sutari Sutari
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Microalbuminuria is a physiological condition ofp atient in which albumin is excreted in urine at 20-200 pg/min or 30-300 mg/day. Determination of microalbumin content in the patient urine is very important for early detection ofmicroalbuminuria before nephropathy occurred. Detection ofrnicroalburnin in the urine is commonly performed by radioimmunoassay (R1A) technique. Human serum albumin labeled with 1251 is commonly used as a tracer and bound and unbound phases in the reaction mixture that can be separated easily and quickly with a coated tube method. Production of R1A kit of microalbuminuria involves preparation of antibody coated into two solid phases of polystyrene tube plain and polystyrene bottom star tube, HSA-'251 tracer and standard solution. The polyclonal anti-human serum albumin (anti-HSA) generated in the rabbit with titer 1 : 15000 was obtained after one year then was coated into polystyrene tubes, the tracer HSA-'251 was prepared using an iodogen method. Series of HSA standard were made by dilution of HSA with synthetic urine. The yield of HSA-121 tracer was about 83,94% with radiochemical purity of 92% and specific activity of 3,3576 pCi/pg. The microalbuminuria RIA kit shows good assay performance of 1, 05% NSB (Non Spesific Binding) and 78,6% B/T The polystyrene bottom star tube shows more higher BIT of bound and could be maintained within 70 days.

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.

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%.

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.

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Home Page

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

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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