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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
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Articles 9 Documents
 1 
Search results for , issue "Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013" : 9 Documents clear
PENENTUAN KOEFISIEN SERAPAN KAYU BANGKIRAI (SHOREA LAEVIFOLIA) DAN PERBANDINGANNYA TERHADAP TIMBAL (Pb) SEBAGAI DINDING RUANG RADIOLOGI DIAGNOSTIK Japeri Japeri; Heri Sutanto; Choirul Anam
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Shield utilization is very important to protect employee and people from radiation. Therefore, the rules are made that one of them is to regulate construction design of diagnostic radiology room which meet radiation protection standart. Indonesia has natural resources which potential to be radiation shield material. The research has been done to determine absorption coeffcicient of bangkirai (Shorea laevifolia) and its comparison with Pb as wall of diagnostic radiology room. X-ray absorption between bangkirai and Pb as the following : Voltage, current and time of X-ray mobile were setted in 81 kV and 32 mAs, distance between focus and object was 100 cm, Multi Purpose Detector (MPD) placed under object, area of irradiation field opened in 5 cm x 5 cm, central beam placed in the center of objects appropriately and then expotion was conducted for untreated bangkirai with (Pb) and treated bangkirai which heated in 100°C for  60 minutes repeteadly according to variation of determined thickness material, finally expotion was conducted for each thickness for three times so that average value obtained and it was repetead until absorption coefficient value of this material obtained.  Result of X-ray absorption on bangkirai tests showed that absorption coefficient () effective for untreated bangkirai and treated bangkirai is 0,029/mm and 0,027/mm, respectively. Equality result showed that unheated bangkirai with 1,3 mm Pb is equivalent with 254 mm untreated bangkirai, while heated bangkirai with 1,3 mm Pb is equivalent with 273 mm treated bangkirai. To reach 2 mm of Pb, untreated bangkirai and treated bangkirai were used with thickness off 391 mm and 420 mm, respectively.Keywords : X-ray mobile, Multi Purpose Detector (MPD), Pb, Bangkirai, Absorption Coefficient ()
KARAKTERISASI RESERVOIR MENGGUNAKAN METODE INVERSI LAMBDA MU RHO (LMR) DAN ELASTIC IMPEDANCE PADA LAPANGAN ‘X’ Dian L Silalahi; Udi Harmoko; M. Razi
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Lambda Mu Rho (LMR) inversion method has been used to diagnose the validity of the brightspot concept as the indication of the existance of hidrocarbon fluid and to find the sandstone lithology distribution of ‘X’ field with validation lithology by using the result of Elastic Impedance (EI) inversion. In fact the existance of brigthspot apparently not always be the indication of the hidrocarbon fluid and sand stone. The application of Lambda Mu Rho inversion method was able to indicates the existance of the hidrocarbon fluid and lithology well by using the incompressibility and rigidity of the rocks. The target zone was Z2260 layer with lithologies of sandstone and shale.Inversion analysis showed the distribution of fluid hidrocarbon and sandstone through indication of the low value of the incompressibility and high value of the rigidity in the target zone. The value of incompressibility dan rigidity is obtained from the data log crossplot which is then used as a reference to determine the distribution of the hidrocarbon and lithology through map inversion. To give a certain type of lithologies we made validation using the result of EI inversion which is sensitive to distinguish the lithologies.LMR inversion result showed hidrocarbon fluid distribution in layer Z2260 with Lambda Rho value 33 to  44 Mpa*gr/cc, the distribution of sandstone lithology with Mu Rho value 30 to 35 Mpa*gr/cc. The lithology was validated by the result of EI inversion which able to show the distribution of sandstone lithology in the Z2260 layer with value 8000 to 9800 (m/s)2*gr/cc. Keywords: Inversion, Lambda Mu Rho (LMR), Elastic Impedance (EI), sandstone, hidrocarbon.
PEMANFAATAN TEKNOLOGI PLASMA UNTUK MENINGKATKAN KADAR NITROGEN DAN PROTEIN PELLET PAKAN SAPI DARI LIMBAH TANAMAN JAGUNG M. Shobarudin; Muhammad Nur
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research has been done on the levels of plasma radiation influence elements of nitrogen and protein samples of cow feed pellets from waste corn plant. Plasma being used in this study are positive corona plasma, which are generated using high voltage direct current (DC) with multiple point to plane electrode configuration, where the distance between the electrodes of 2.5 cm.On the research of this variable are used i.e. with voltage variations of quantity (3-9.5) kV, where the samples without treatment used as controls. Plasma reactor used in the research of electrode of multi point to plane, in which the electrodes point is connected to the positive electrode. Distance between electrodes of 2.5 cm.High electrical field strength around the electrodes can ionize the gas molecules of nitrogen around the active electrode. Ions of nitrogen is depositioning to the sample, so would the levels of nitrogen. Voltage variations can affect the amount of ions formed thereby affecting the levels of nitrogen samples. From this research conclusion effective voltage plasma radiation occurs at voltage 4 kV with levels of nitrogen 1.169% or the equivalent of 7.30% protein. These results meet minimum standards of proteins, suggested by Parakkasi (1999) of 7%.Keywords: plasma, ion, pellets, nitrogen, protein.
IDENTIFIKASI PERSEBARAN HIDROKARBON PADA KONGLOMERAT FORMASI JATIBARANG MENGGUNAKAN ANALISIS INVERSI AVO (Amplitude Versus Offset) Retno Septiani; Hernowo Danusaputro; Dimas Pramudito
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

AVO inversion analysis (Amplitude Versus Offset) has been done on  DBT-12 field to identify and map the distribution of hydrocarbons in conglomerat layer, Jatibarang formation, northern part of West Java basin. Sensitiv physical parameters to  separate conglomerate with other litology (lava) are λ/μ, σ and Vp/Vs. Intercept which is obtained is positive while  gradient is negative. AVO anomaly class obtained is IIp can be used as a first indicator content of the fluid is low impedance sand. This reservoir impedance values decrease for the increasing of incidence angle. Besides intercept and gradient AVO attributes which obtained is fluid factor and Poisson reflectivity. Both of these attributes is negative which means changes value of Poisson's ratio is quite large from high to low. Changes in Poisson's Ratio can indicate the existence of a hydrocarbon. Distribution of hydrocarbons DBT-12 on conglomerate layer is northwest - southeast. Keyword : Inversion, AVO, Atributtes, Conglomerat, Hydrocarbon
ANALISIS PENERIMAAN DOSIS RADIASI DI ORGAN MATA PADA PEMERIKSAAN NASOFARING MENGGUNAKAN CT SCAN Masdi Masdi; Evi Setiawati; Choirul Anam
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACTThe examination of nasopharynx CT Scan for the diagnosis tumors, was performed by two phase, plain phase and contrast medium phase, so will result in a very high radiation dose to the organs in the head especially the eyes. This study aimed to obtain the value of the radiation dose was received organ in the eye in patient who underwent nasopharynx CT Scan.  The study was begun by measuring the consistency of the output X-ray tube voltage (kVp Output). Furthermore, measurement of the radiation dose to the organ eye using TLD-100 chips were placed on the surface of the eye organ of the 22 different patients with sequences and spiral scan mode, and using the slice number between 24 to 39. Measurement technique was done by using a tube voltage and tube current time fixed at 130 kVp, 250 mAs, slice thickness and slice collimation of 4 mm and 6x2 mm.The result on the eye organ doses of nasopharynx CT Scan two phase with sequence mode to obtain eye organ dose value between 83.291 mGy to 101.571 mGy, whereas the spiral mode to obtain eye organ dose values varied between 89.536 mGy to 109.359 mGy, showing that the value of the eye organ dose spiral modes greater than mode sequence. The results also showed that the value of the eye organ dose received about one fifth of the value of the damage threshold of the eye lens dose of 500 mGy. Key words: Eye dose, CT Scan, thermoluminisence dosimeter (TLD)
PEMBUATAN PROGRAM REKONSTRUKSI KONTUR CITRA 3D PADA ORGAN MENGGUNAKAN MATLAB 2008a Siti A'isyah; Kusworo Adi; Choirul Anam
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Program of contour  Reconstruction of 3D imaging at organ has been done. To determine the tumor volume by creating a 3D contour Planning Target Volume (PTV) and organs at risk in head for each image slice. Determination of 3D PTV contour begins with contouring, featuring contour, contour editing and showing PTV and organs at risk in 3D. So that a more accurate determination of radiotherapy dose and the organ at risk dose does not exceed a given tolerance. 3D contour reconstruction algorithm can be displayed on each slice so organ at risk boundary and Planning Target Volume (PTV) that used to radiotherapy treatment can be seen.Keywords: radiotherapy, treatment planning system (TPS), Planning Target Volume (PTV).
ANALISA PERSEBARAN LITOLOGI SANDSTONE PADA FORMASI TALANG AKAR MENGGUNAKAN INVERSI EXTENDED ELASTIC IMPEDANCE (EEI) DI LAPANGAN CILAMAYA, CEKUNGAN JAWA BARAT UTARA Ophi Thio Rendy; Agus Setyawan; Muhammad Mualimin
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Extended Elastic Impedance (EEI) inversion method has been used to analyze sandstone lithology distribution of Talang Akar Formation in Cilamaya Field, North West Java Basin. The target zone was Z2230 layer which located in Talang Akar Formation with litologies of sandstone and shale. Sensitivity analysis showed that gamma-ray and density are sensitive to discriminate the type of lithologies in Z2230 target layer. EEI(58) could simulate gamma-ray and EEI(12) could simulate density with respectively 0,397 and 0,613 correlation values. EEI(12) inversion result showed sandstone lithology distribution in Z2230 layer with 8800 to 9800 . Sandstone lithology distribution concentrated in northwest–southeast of study area. There was hydrocarbon prospect area in north of well OTR-10.Keywords : Extended Elastic Impedance (EEI), gamma-ray, density, sandstone 
APLIKASI METODE BIDIMENSIONAL EMPERICAL MODE DECOMPOSITION (BEMD) UNTUK DATA GAYABERAT GUNUNG UNGARAN, INDONESIA Fuad Tarmidzi; Agus Setyawan
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Gravity method processing will obtained gravity anomaly which is combination between regional and local gravity anomalies that need to separate it for interpretation. Upward continuation method commonly used to separates regional and local gravity anomalies. Recently, the separation of these anomalies can be done with Bidimensional Empirical Mode Decomposition (BEMD) method which its calculation based on gravity anomaly profile. BEMD will separates gravity anomali profile based on its frequency that some sub-sinyal will obtained from it. On this research, BEMD method has been used to separate gravity anomaly of Ungaran Mountain dan the result of it compared with the result from Upward Continuation method. 5 Intrinsic Mode Function (IMF) and 1 residual were obtained from BEMD method, wherein IMF3 showed pattern of regional gravity anomali and IMF1 showed pattern of local gravity anomaly. With using these methods, obtained patterns were similar. Keywords: BEMD, Gravity anomalies, Ungaran, IMF
ANALISIS KORELASI INDEKS BIAS DENGAN KONSENTRASI SUKROSA BEBERAPA JENIS MADU MENGGUNAKAN PORTABLE BRIX METER Putri Parmitasari; Eko Hidayanto
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Sucrose concentration of honey solution has been analized by using Portable Brix Meter to determine its refractive index using Abbe refractometer. The materials used are honey randu solution, honey pollen, honey flora, honey klengkeng, honey karet, honey rambutan, white honey royal jelly, and honey kapuk with a concentration of 10 % until 50 %. The meansurement of sucrose concentration was performed by droping a few of sample solution above the sample table in this equipment. The content of sucrose is displayed digitally with units brix (%).    The concentration of sucrose solution proportional to the refractive index. The increase of concentration of sucrose solution will increase the refractive index. Correlation between the concentration of sucrose solution with refractive index by the equation n = 0,001C + 1,334 (R2 = 0,9972), n = 0,001C + 1,354 (R2 = 0,9919), n = 0,0015C +1,334 (R2 = 0,9999), n = 0,002C + 1,333 (R2 = 0,9817), n = 0,0015C + 1,334 (R2 = 0,9819), n = 0,002C + 1,328 (R2 = 0,9969), n = 0,002C + 1,329 (R2 = 0,9936), n = 0,002C + 1,322 (R2 = 0,9830). Refractive index of sucrose solution can be determined from its concentration.Keywords : refractive index, concentration of sucrose, honey, portable brix meter

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