Much. Azam
Jurusan Fisika FMIPA UNDIP, Semarang

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PENENTUAN KANDUNGAN UNSUR KROM DALAM LIMBAH TEKSTIL DENGAN METODE ANALISIS PENGAKTIFAN NEUTRON Khaerani, Nina; Azam, Much.; Firdausi, K. Sofjan; Soeleman, Soeleman
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A determination of chromium which consisted in textile cesspool one of the company of textile residing in Ungaran using neutron activation analysis method.The sample has been threated in the form of sediment sample and liquid sample. The sample then an irradiated by Lazy Susan irradiation facility at Kartini reactor for six hours and then  the counting is done by HPGe detector for 300 seconds. The qualitative results shown that samples contents Cr-51. The quantitatively sediment sample chromium element rate equal to 491. 67 ppm and liquid sample chromium element rate equal  to 0.011  ppm Key words: Neutron Activation Analysis, irradiation.
PENGUJIAN BAHAN UNTUK ELEKTRODA PADA SISTEM DIELEKTROFORESIS Azam, Much.
YOUNGSTER PHYSICS JOURNAL Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

In this paper described the results of electrode material testing point-field configuration for the system dielektroforesis. Type of materials used iron, stenlees, silver and gold. Testing is done to know the type of material that is not easy to cause electrolysis in bioparticle medium, either with or without layer of insulator (glue). The test was also conducted to determine whether or not the phenomenon of electrophoresis in water flea (cladocera) was given a 1-10 voltlt AC voltage with a frequency of 6 MHz. The test results showed that in all types of electrode materials used, electrolysis did not occur when the electrodes were given a layer of insulator, and electrolysis occurred when not given a layer of insulator. While the phenomenon dielektroforesis not visible when given AC voltage up to 10 Volt and frequency 6 MHz.Keywords: Dielectrophoresis, cladocera, electrolisis, point-plate electrode
PENENTUAN DOSIS GAMMA PADA FASILITAS IRADIASI REAKTOR KARTINI SETELAH SHUT DOWN Prasetyowati, Risprapti; Azam, Much.; Firdausi, K. Sofjan; B. S., Edi Trijono
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Determination of gamma dose after reactor shut-down around the kartini reactor core have beeb done. The measurement was done at the Lazy Susan (Rotary Rack) and outside the reflector wall which could be used as irradiation facility. Determination of gamma dose was carried out using wide range dosimeter consisting of a Geiger muller detector end a surveymeter. Detector was directed to outside wall reflector and lazy susan through the dry irradiation facility. Measurement was done after shut down for 3 hours with power of 100 kW and interval of ± 5 minutes. The resulting dose rate in reflector wall without neutron source was 1,2 to 0,2 kR/hour and cumulative dose in a 205  minute period was 2,21 kRad. In reflector wall with neutron source was 6  to 0,2 kR/hour and cumulative dose in a 202  minute period was 2,25 kRad.  While in lazy Susan dose rate of 60 to 2 kR/hour and cumulative dose was 42,70 kRad in 203 minutes decay. Gamma decay constant in reflector wall without  neutron source was 0,008 per minute, with neutron source 0,013 per minute. While in lazy Susan gamma decay constant was 0,014 per minute. Keywords : dose, gamm, core and  reflector, reactor
PENENTUAN KARAKTERISASI CERROBEND SEBAGAI “WEDGE FILTER” PADA PESAWAT TELETERAPI 60CO Azam, Much.; Firdausi, K. Sofjan; Silvani, Sisca
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Wedge filter usually used in cavum nasi ossa maxillaris tumor therapy. And usually it is made of timbal. However, cerrobend as the alternative material is possible and needed too. The material characterization is done through determining the linear absorption coeffisien of cerrobend and the proportion of the thickness of cerrobend to timbal,  and as well as comparing the total treatment dose rate of timbal wedge filter with cerrobend wedge filter. Based on the result of the research, it is found that the linear absorption coeffisien value of cerrobend wedge filter with energy of 1.33 MeV is 0.43% cm-1. The average ratio of the thickness of cerrobend to timbal is 1.485 ± 0.002, and the difference of the total treatment dose rate between those two wedge filter is only a little, that is 0.72 cGy/minutes.  Keywords : cerrobend, wedge filter and the linear absorption coeffisien
SIMULASI NUMERIK GAYA DIELEKTROFORESIS PADA BIOPARTIKEL BERBENTUK BOLA Azam, Much.
YOUNGSTER PHYSICS JOURNAL Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This paper presents results of simulations of the electric field and dielectrophoretic force on a bioparticel suspended in a host liquid lying between point-plate electrodes. The method of calculation is based on the method of dipole images using the finite-elemen technique. We have investigated the effect of the bioparticle permittivity, and liquid permittivity on the dielectrophoresis spectrum. The results show that the bioparticle permittivity, and liquid permittivity influence to the dielectrophoresis spectrum on  the different frekuensi range and the point-plate electrode configuration is suitable with dielectrophoresis system because the configuration  can produce the  inhomogen electric field.Keywords: Dielectrophoresis, sphere bioparticle, permittivity, point-plate elecrode
KAJIAN AWAL SIFAT OPTIS TAKLINIER BAHAN TRANSPARAN DALAM MEDAN LISTRIK STATIS Prabowo, Krisno; Firdausi, K. Sofjan; Azam, Much.
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

In this paper, we study non linear optical characteristics of some transparency media in a static external electric field, E. The samples used in this experiment are mineral water, salt solution, and sugar solution. The optical characteristic investigated here is the change of polarization angle,b, of laser He-Ne after pass through the sample, against E. The strength of electric field is produced by high voltage (0-2000 volt) applied on two parallel plates (size 28 × 28 cm2). It is assumed that E inside the plates is homogeneous and fulfilled by relation of E = V/d. Results of experiment show that three samples have the tendency of b µ E in this experimental condition assumed to be optimal. For weak (mineral water) and strong (salt solution) electrolyte solution, we obtain a significant difference of gradient, that shows how dominant the electric dipoles in salt more than in mineral water. Other wise, change of b vs. E in sugar solution has only significant initial value of b. The tendency of b µ E is just only due to the contribution of dipoles of water molecules in sugar solution, since the sugar molecules is non polar.
POLARISASI FLUORESENS PADA VIRGIN COCONUT OIL SETELAH MENGALAMI OZONASI Azzahroh, Muffaricha; Sugito, Heri; Richardina, Very; Azam, Much.; Firdausi, Ketut Sofjan
BERKALA FISIKA Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019
Publisher : BERKALA FISIKA

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Abstract

This study investigates interaction effects between ozone and Virgin Coconut Oil (VCO) on fluorescence polarization. The ozonation time variations carried out on VCO were 30 minutes, 60 minutes and 90 minutes with ozone flow rates of 0.6L / minute. The degradation of VCO quality due to ozonation was determined by measuring changes in the fluorescence polarization angle of the light emitted by the sample, using a green laser pointer with a wavelength of 532 nm. Typical fluorescence polarization characteristics in the range of polarization angle variations from ? = 0? to ? = 180? are in accordance with the results of previous studies. Increasing the length of ozonation in the sample results in an increase in fluorescence polarization. The average fluorescence polarization in the range 0? ? ? ? 180? rises linearly over the duration of ozonation, which indicates that ozone interactions are quite effective in degrading the quality of VCO. The validation results also obtained that the duration of ozonation also increases the amount of free fatty acids, however it needs to be further investigated whether the amount of free fatty acids directly contributes to fluorescence polarization. The study of interaction of ozone in solution in biophysics and also its benefits for skin therapy in medical science are very interesting to be further conducted.Keywords: Fluorescence polarization, Virgin Coconut Oil, polarization angle
Mapping Various Cooking Oil using Fluorescence Polarization Firdausi, Ketut Sofjan; Afiefah, I.; Sugito, Heri; Azam, Much.
Journal of Physics and Its Applications Vol 1, No 1 (2018): November 2018
Publisher : Journal of Physics and Its Applications

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1675.834 KB) | DOI: 10.14710/jpa.v1i1.3913

Abstract

In this report we have succeeded to map various cooking oils using change of fluorescence polarization. Various cooking oils consisted of several vegetables oils and animal oils (chicken oil and lard) were used in the experiment, and some oils were measured in two different times. The change of polarization angle &tetha; was measured as the difference between linear polarized green pointer laser as incoming light and fluorescence light using a pair of polarizers. The direct measurement of fluorescence polarization gives a new unique result of critical polarizer’s angle φc that can group vegetable cooking oils into group 1 (at φc = 10o for VCO, olive, and soybean), group 2 (at φc = 20o for palm, corn and rice bran), group 3 (at φc = 30o for sunflower and canola), and also animals cooking oils into group 4 (at φc = 20o for chicken oil), and group 5 (at φc = 40o for lard). Mostly cooking oils can be distinguished using modified maps. The large difference φc and &tetha; of lard from vegetable oils provides an advantage to develop for testing halal oil due to lard contamination. The capability of this method has benefits, at least, as a complement and simple method in comparison to other expensive sophisticated instruments such as fluorescence spectroscopy or GCMS methods with their derivation’s instruments.
RESPON NON LINIER SIFAT OPTIS LARUTAN MGSO4 Firdausi, K. Sofjan; Azam, Much.; Romadhona, Thithit; Abadi, Prayitno
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A response of nonlinear optic of several salt solutions in external magnetic field has been studied. An altered magnetic field varies from 0 until 0,2T used to induce samples, and then change of polarization angle b is measured by polarizators, where the direction propagation of laser is perpendicular to the direction of B. Various concentration of solution is used at 5% until 35%. Our experiment shows that the graphs of b vs. B are still linear for mineral water and NaCl solution. However, for MgSO4 solution, we obtained polynomial tendency of this graph. At 20% until 35% of concentration of this solution it has polynomial in third order. Keywords: Nonlinear optics, change of polarization angle, external magnetic field.
STUDI AWAL SIFAT OPTIS TAKLINIER LARUTAN GARAM DALAM MEDAN MAGNET LUAR Priyono, Priyono; Firdausi, K. Sofjan; Wardaya, Asep Y.; Azam, Much.; Marhaendrajaya, Indras; Budi, Wahyu Setia
Jurnal Sains Materi Indonesia Vol 7, No 1: OKTOBER 2005
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jusami.2005.7.1.5020

Abstract

STUDI AWAL SIFAT OPTIS TAKLINIER LARUTAN GARAM DALAM MEDAN MAGNET LUAR. Telah dilakukan kajian pada sifat optis taklinier dari larutan garamdalammedanmagnet luar (B). Besar medan magnet maksimum adalah sekitar 0,049 T yang dihasilkan dari kumparan kawat sebanyak 6625 lilitan dan dialiri arus listrik bolak-balik sebesar maksimum 5 A. Interaksi radiasi sinar Laser He-Ne 633 nm, 5 mW, dengan sampel dalam medan magnet digunakan untuk mengukur perubahan sudut polarisasi cahaya laser. Sedangkan perubahan indek bias terhadap B diperoleh dengan metode interferometer Michelson. Untuk variasi konsentrasi larutan NaCl, diperoleh bahwa perubahan sudut polarisasi bertambah secara linier terhadap B. Sedangkan indek bias cenderung berkurang secara linier dengan kenaikan B.