Bambang Ruwanto, Bambang
Universitas Negeri Yogyakarta

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Journal : Jurnal Penelitian Saintek

PENERAPAN FUNGSI NISBAH DALAM ELEKTRODINAMIKA Ruwanto, Bambang; Maryanto, Maryanto
Jurnal Penelitian Saintek Vol 7, No 1 (2002): April 2002
Publisher : Jurnal Penelitian Saintek

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Abstract

Analyzes    about    characteristics    of    quotient   functionQ(x) = (1- x)/(l  + x)  have been done, where x was scalarvariable.  The result  of  the  analyzes showed  that  quotient function had inverse character and it can be developedfor two variables of multiplication or more. Application of quotient function   in  electrodynamics for   calculation  of  reflection coefficient on reflection wave on boundary plane producessimpleformulation for  r TE  and r TM.    The result is very useful, because mathematics calculation can be done easily.Keywords: quotientfunction, electrodynamics.
PENENTUAN KADAR MERKURI PADA AIR, SEDIMEN, DAN BlOT A AIR DAS KAPUAS DENGAN TEKNOLOGI ANALISIS PENGAKTIF AN NEUTRON (APN) Wiyatmo, Yusman; Ruwanto, Bambang
Jurnal Penelitian Saintek Vol 10, No 2 (2005): Oktober 2005
Publisher : Jurnal Penelitian Saintek

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Abstract

The aim of this research were: 1) to determinate mercury disposition in water, sedimen,   and biota in Kapuas river, and 2)  to evaluate whether mercury disposition of the sample have been exceeded the threshold value which permitted  to  be  consummed  by animal an human. The sample of this research were water, sediment, and biota (algae and fish)  in Kapuas river.The research was carried out by experiment with  neutron activation  analysis  (NAA) method     The determination of the elements in sample was conducted by gamma spectroscopy.  The mercury disposition in sample was determined by comparing the cps of sample and the cps of standard (20 ppm). The results showed that the mercury disposition in water at TPI pier, KPLP pier, Dephub pier, and Kampung Mendawai were 0,25 ppm,0,14 ppm,    0,19 ppm,  and  0,09 ppm  respectively.    The mercury disposition at sediment in TPI pier and Dephub pier were 1.56 ppm0.63 ppm  respectively.  on  the  other  hand  the  disposition  of  the mercury in KPLP pier and Kampung Mendawai were not detectedThe mercury disposition at algae  in a  cross  of Pertamina   office, Taman Alun-Alun  Kapuas, Kapuas bridge, and near Sudarso hospital were 0,41 ppm, 0,59 ppm. 0.58 ppm, dan 0,68 ppm respectively.Keywords: The mercury disposition, water, sediment, water biota. andNAA.