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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

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

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.

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.

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

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

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.

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.

KARAKTERISASI FISIKOKIMIA CTMP BERTANDA TEKNESIUM-99m SEBAGAI RADIOFARMAKA PENYIDIK KANKER TULANG Isti Daruwati; Misyetti Misyetti; Maula Eka Sriyani
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Radiopharmaceutical for bone cancer seeking was developed in variable phosphonate compound labeled with technetium-99m, formally pyrophosphate and diphosphonate compound. Either pyrophosphate or diphosphonate still unsatisfied to use as radiopharmaceuticals for bone seeking agent because the high accumulation in lever, muscle and blood. CTMP have higher affinity than others. The Physicochemical characterization of 99"Tc-CTMP has been conducted. The characteristic of labeled compound have to fulfill the criteria as the good radiopharmaceutical. The characteristic such as radiochemical purity, electric charge, lipophilicity, plasma protein binding, and hydroxy apatite binding. The results showed that the radiochemical purity greater than 95% (96,83 % ± 1,35), have a negative electric charge, lipophilicity -2,61, plasma protein binding 31,90 % ± 3,3, hydroxyl apatite binding 76,6% at 3 hours. The value ofhidroxy apatite binding was high, it showed CTMP have indicated a great potential as radiopharmaceutical for bone cancer seeking.

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.

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.

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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