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ANALISIS FENOMENA ELECTROHYDRODYNAMIC PADA PERMUKAAN MINYAK SILIKON (CAIRAN DIELEKTRIK) MENGGUNAKAN SISTEM PEMBANGKIT PLASMA LUCUTAN PIJAR KORONA NEGATIF DENGAN ELEKTRODA BERKONFIGURASI TITIK BIDANG Nur, Muhammad; Anam, Choirul; Arisa, Betri
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

An analysis of Electrohydrodynamic (EHD) phenomenon deformation of oil silicon surface has been done.The negative corona glow discharge plasma in this research is generated by plasma generator system in point to plane electrodes configuration. The first step of experiment is to determine correlation of voltage and electric current, and correlation of distance between electrode and electric current. Then, the second is to determine correlation of voltage and hole radius of oil silicon surface, and corelation of distance between electrode and hole radius of oil silicon surface. Finally, it is to determine  the velocity hole for back to initial position of oil silicon surface after turn off electric field. The EHD phenomenon of oil silicon can be generated by impose of non homogeneous high electrics field. The voltage of corona at distance between electrodes 1 cm, 1,5 cm and  2 cm are 2,6 kV-4 kV,  3,4 kV-5,2 kV, and  3,8 kV-6,0 kV respectively. The increase of electrics field intensity influence dipole moment strength, it increases the radius of the hole of oil silicon surface. The increase of distance between electrode influence parabolic angle of electrics line field then cause the increase of hole radius. After this, if the electric field is zero with  increasing voltage, velocity hole of  oil silicon for back to initial position  slower then if the increasing of h, that makes the velocity hole for back to initial position faster.   Key words: Electrohydrodynamic, Silicon Oil, Dielectric polarization, Positive corona glow discharge plasma, ionic wind.
Kajian Spektrum Sinar-X 6 MV Menggunakan Simulasi Monte Carlo Anam, Choirul
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

X-ray spectra produced by Elekta Linac for 6 MV beam  have been evaluated using Monte Carlo simulation. In this simulation, Linac head was modeled using BEAMnrc code. X-ray sepctra, fluence vs position, and energy fluence vs position were determined using BEAMDP code. In this simulation, the SSD (source skin distance) was 90 cm and the field size of radiation was 10 x 10 cm2. Energy electrons arriving at the target (incident electron) was varied 5.7 MeV, 6.0 MeV, 6.3 MeV and 6.6 MeV. As for the radial intensity, FWHM values ​​varied 1.0 mm, namely 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm. X-ray spectra were determined at the surface of the phantom. Iit was found that the curve 6 MV X-ray spectra has a shape not symmetry with an average energy of about 2 MeV. In the spectra there is no energy X-ray radiation value exceeds the kinetic energy of incident electrons. X-ray spectra is not affected by the width of electron beam striking on the target. if the electron energy increases, it will generate increased fluence and energy fluence, but no effect on the penumbra region (the edge of field size). If the electron beam width increases, it will result in the radiation field edge becomes less sharp or penumbra widening. Keywords — Monte Carlo Simulation, X-ray spectra, Linear Accelerator
MEYIAPKAN DOKUMEN ILMIAH UNTUK PUBLIKASI DI JURNAL Anam, Choirul
BERKALA FISIKA Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019
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Abstract

MEYIAPKAN DOKUMEN ILMIAH UNTUK PUBLIKASI DI JURNAL
DOKUMEN PUBLIKASI ILMIAH: WARISAN YANG TAK TERNILAI HARGANYA Anam, Choirul
BERKALA FISIKA Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019
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Abstract

DOKUMEN PUBLIKASI ILMIAH: WARISAN YANG TAK TERNILAI HARGANYA
SIMULASI MONTE CARLO UNTUK MENENTUKAN DOSIS SINAR-X 6 MV PADA KETAKHOMOGENAN MEDIUM JARINGAN TUBUH Rizani, Alfian; Setiabudi, Wahyu; Anam, Choirul
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
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Abstract

Study on dose distribution of human body at 6 MV X-ray beam has been done using Monte Carlo Simulation. This study is aimed to define dose distribution of soft tissues, lungs andbones also corrections factor due to tissue inhomogeneity.The study was conducted by Monte Carlo Simulation using EGSnrc software, i.e.BEAMnrc and DOSXYZnrc. The linear accelerator head was simulated by BEAMnrc  with SSD100 cm and field size 10 x 10 cm . The calculating of radiation dose distribution at homogen andnonhomogen phantom that have size 40 x 40 x 40 cm in tissues of human body, such as softtissues, lungs and bones were made by using DOSXYZnrc. Nonhomogen phantom of human bodywas made by insert lungs or bones with thickness 10 cm in soft tissues at depth of 5 cm – 14 cm.It is obtained that the dose distribution of soft tissue and water phantom have samecharacteristic which both of them have maximum dose (D ) at depth of 1,5 cm. Inserting of lungswith a thickness of 10 cm in soft tissue results to the increasing of dose until 12,2 % and insertingof bones with the same thickness with lungs results to decreasing of dose until 10,3 %. The rangeof correction factor due to inserting lungs is 1,00–1,27 and for bone is 0,81–1,05.Keywords:Monte Carlo Simulation, PDD (Percentage Depth Dose), corrections factor
PENGARUH JARAK PADA KUALITAS CITRA HASIL REKONSTRUKSI MODE FAN BEAM DENGAN GEOMETRI DETEKTOR BERUPA GARIS Anam, Choirul; Widodo, Catur Edi
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
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Abstract

Image recontruction for fan beam mode with line geometry of detectors have been done. Theobject being imaged is the Shepp-Logan phantom with matrix size 50x50. Projections were made forangle 00 to 3600 with angle interval 10. The distance between the rays in the midle of the object (s) isequivalent to 1 pixel. The distance of source to central of object (D) were varied 40,50, 60, 70, 80, 90,100, 110 pixels. Reconstruction of image was carried out by the method of filtered back projection(FBP) with Lek-Ram filter. It is obtained that if the distance of X-ray source and center of the object,smaller than 3/4 diagonal object, the image will be distorted, and if the distance is greater than 6/7diagonal object, the image will be clipped.Keywords: Image reconstruction, fan beam, line geometry of detector
KOMPARASI KUALITAS CITRA HASIL REKONSTRUKSI METODE ALGEBRAIC RECONSTRUCTION TECHNIQUE (ART) ADITIF DAN MULTIPLIKATIF (MART) PADA CT SCAN Anam, Choirul; Firdausi, K Sofjan
BERKALA FISIKA Vol 14, No 4 (2011): Berkala Fisika
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Abstract

AbstractImage recontruction for CT scan by the methods of additive ART and muliplicative ART (MART) have been carried out using Malab software. The object used is Sheep-Logan phantomwith matrix size 50x50,  used a paralel beam and  angle interval 10, 50, 10,respectively. It is obtained that additive ART produces many artifacts, while MART producesfewer artifacts. Additive ART produces a contras between objects and background with relativelyhigh, while MART produces relatively lower contrast. It is obtained that in the additive ART,interval angle affects the quality of image. This does not happen to MART. So, the MARTreconstruct CT image faster, because it can be obtained relatively good image despite the angleinterval is large.Keywords: Image reconstruction, Additive ART, Multiplicative ART (MART)
UJI KECEPATAN REKONSTRUKSI CITRA PADA CT-SCAN METODE BACK-PROJECTION (BP) DAN METODE FILTERED BACK-PROJECTION (FBP) DENGAN PEMFILTERAN PADA DOMAIN SPASIAL Ngurah Sutapa, Gusti; Anam, Choirul
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

Conventional X-ray have many limitations in describing the object being imaged because of overlap on multiple objects on a single line of projection. To overcome this limitation, the object was expossed in several directions, and then the projections from several directions was reconstructed to get cross-section image. The reconstruction method was widely used filtered back projection method as the development of a simple back projection. In this study will be evaluated the speed of the reconstruction for the back projection method and filtered back projection in the spatial domain. It was conducted for the projection angle from 0 to 180 degree, with interval  25, 20, 15, 10 and 5 degrees. In this research the number pixels was 50x50. It was found that the smaller of the interval of the angle projections, then it will get better results, but it takes longer. From back projection and filtered back projection methods, was obtained if the interval of the angle projections a half times smaller, it will take nearly twice as long of time. It was found that the time difference between back-projection and filtered back projection methods is less than 0.1 seconds. Keywords: Image reconstruction, back-projection, filtered back-projection, convolution
Pengaruh Kenaikan Suhu Cairan Developer Terhadap Densitas Radiograf Septiadi, Jujun; Anam, Choirul; Azam, Much
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
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Abstract

This aim of the research is to obtain an optimal developer temperature. The increase of dilution temperature of developer to radiograph density has been measured. The Research is conducted with measuring radiograph density with a certain exposure factor and materials and varies temperature among 170 C – 320 C.  The result indicates that the higher of temperature is the greater of its density value. The optimal temperature obtained at spanning temperature among 200 C – 230 C.   Key words: The dilution temperature of developer, density of radiograph, optimal temperature
PENENTUAN CT DOSE INDEX (CTDI) UNTUK VARIASI SLICE THICKNESS DENGAN PROGRAM DOSXYZNRC Andriani, Intan; Anam, Choirul; Setiawati, Evi
BERKALA FISIKA Vol 15, No 3 (2012): Berkala Fisika
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Abstract

The calculation of CT dose and CTDI has been done by using DOSXYZnrc software. Two kinds of phantoms have been used, i.e air and PMMA phantoms. The volume of phantoms 16 x 16x 16 cm3. The simulation carried out at 120 kV and the particles source 106. The calculation ofdose at the mid of phantom at the z axis, every voxel 0,2 x 0,2 x 0.2 mm3. The  variation of slicethickness were 5 mm, 10 mm, 15 mm and 20 mm. The dosages at every point then were plotted tofind out dose profile, and then were integrated to find out the CTDI. It was obtained that the peakvalue  on the air phantom has a higher value than the PMMA phantom. In the air phantom at theslice thickness of 5 mm, 10 mm, 15 mm and 20 mm were 68.28%, 80.49%, 90.91%, 99.86%. Whilein PMMA were 63.68%, 77.42%, 89.32%, 100%. At the penumbral region, it was obtained thatdosage at the PMAA phantom has a higher than the air phantom. CTDI from the PMAA phantomwas 212.50% and the air phantom was 184%. It was obtained that CTDI independent of slicethickness at the range 5-20 cm.Keywords: DOSXYZnrc, Slice thickness, CTDI
Co-Authors - Basyirun A.A. Ketut Agung Cahyawan W Achmad Helmy Djawahir Adi Pamungkas Aditya, Wahyu Yoga Agung, Fikri Mudzakki Syam Ahadiyah, Naeli Ni'matin Ahmad Zainudin Ahmad, Karyoto Al Farobi, Mohammad Alan Tanjung Aji Prastowo Alfian Rizani Alfiana Alfiana Alhamid, Mohammad Zamakhsari Ali, Mohd Hanafi Alindra, Bagoes Malik Amalia, Laili Amilia, Riska Amirul Mukminin Ana Amiroh Anak Agung Gede Sugianthara Andika, Febri Dwi Andri Febrianto, Andri Andy Rachman Andy Suryowinoto Annisa Tenri Maya Anugrah Ariyani S. Ariefin, Mesra Surya Ariij Naufal Armanu Thoyib Aulia, Febriana Nur Awalizan, Mochamad Sigit Awwalin, Aufi Rizqiatul Azhar Azhar Aziz Nugroho Azraini, Dinda Basito Basito, Basito Betri Arisa Bramada Winiar Putra Cahyo Indarto Catur Edi Widodo Conoras, Moch El Bahar Daffafauzan, Daffafauzan Damayanti, Elok Darmawan, Bayu Sigit Dayanti, Putri Rahma Dewi A. Insiano Dewi Dewandari, Dewi Dewi Tri Nugraheni, Dewi Tri Diaguna, Ridwan Dian Eka Kusumawati Dougherty, Geoff Dwi Siwi Retnoningsih Efendi, Muhammad Yusuf Efendi, Nur Mahfud Eka Putra, Ricky Eko Hidayanto Eko Sulistijono Elvira Rizqi Widyanti Emi Widiyanti Emmy Hamidah Erita Yuliasesti Diah Sari Erlyna Wida R, Erlyna Wida Erlyna Wida Riptanti Esti Widowati, Esti Evi Handriani Bertua Simamora Evi Setiawati Fadilah, Mega Fianita Faiza, Nadia Mayla Fakhrur Rozi, Nanang Farhatin Nurul Ihya Fatichin, Khusnul Fatkhiyatul Athiqoh Fauzia Puspa Lestari Firmansyah, Riza Agung Firnanda, Rony Freddy Haryanto Freddy Haryanto Fuad, Ali Geoff Dougherty Geoff Dougherty Geoff Dougherty Gusti Ngurah Sutapa Hananur Rohiem, Nasyith Handayani, Heni Yuli Handini Devi Yunitasari Hanif Rani Iswari Hardiyanti, Yati Harini Harini Harsono Harsono Herfan, Mohammad Heri Pratikto Heri Susanto Heri Sutanto Heri Sutanto Hermawan, Akbar Hidayatullah, Fajar Hima, Mulk HMS Chandra Kusuma Huda, M Masrur I Wayan Ari Makmur Idam Arif Idam Arif Ilafi, Rasi Insani, Auralia Fikri Intan Andriani istiqomah istiqomah Iva Khoiril Mala Jamal Jamal Jamhari Jamhari Japeri Japeri Jujun Septiadi K Sofjan Firdausi K. Sofjan Firdausi Khadafi, Shah khusnul khotimah Kliwon Hidayat Kristiyono, Antonius Edy Kusworo Adi Laksono, Bagus Yudit Leksono, Sonny Lestari, Fauzia Puspa Luh Putu Ratna Sundari M IRFAN, M Mahendra, Alief Thufail Mahfudz Fauzan Maman Herman Mariyatul Qibtiyah Masdi Masdi Masfufiah, Ilmiatul Maulania, Raudya Zahra Moch. Junaidi Hidayat Mohammad Haekal Mohd Hanafi Ali Mubarok, M. Rifqi Much Azam Muchammad Kurniawan Muhammad Farhan Muhammad Khumaedi Muhammad Nur Muharom, Syahri Mukhtar Hanafi Munawir Munawir Nafisah, Thohirotun Natih, Made Naradhara Ayuko Naufal, Ariij Nazil Ainurrofik Nira Radita Nopendri Nopendri Nugraha, Larasadi Harya Nugroho Agung, Nugroho Nur Dwi Prasetyo Nur Paramita Nira Mulyono Nurul Firdausi Nuzula, Nurul Firdausi Oktafiana, Brina Oktavia, Armida Patria Uman Putra, Novian Permana, Rizal Bagus Prabowo, Rizkianto Prasetyo, Indra Prawoto, Agus Priharto, Muria Ilham Priyono Priyono Priyono, Setyo Puput Khusnaiatul Purwoto, Septyaningrum Putri Putri, Maulidia Qonita, Qonita Rahmawati, Widiya Raji, Moh. Ramadan, Arief Dian Rena Widita Rena Widita Rika Fitriani Rinaldi, Ade Rizky Riris Trima Derita Sari Riska Amilia Rizalnur Firdaus Rokhim, Ahmad Abdur Romadhon Romadhon Ryan Kurniawan Sabiliat, Nur Edy Sabiliat, Nur Edy Salim, Ach. Khafid Salsabila, Sagita Samponu, Yohakim Benedictus Samponu, Yohakim Benedictus Sanggam Ramantisan Saptaria, Lina Saragih, Jhon Hadearon Sari, Devi Nur Mayang Sari, Virda Nawang Septyan, Mamat Setiawan, Agus Saleh Setyawati, Rohmah Cahya Eka Setyowati Setyowati Sirojudin Sirojudin Siti A'isyah Siti Maesaroh Siti Nur Endahyani Slamet Riyanto Sofyan, Misba Maulana Sri Adikadarsih, Sri SRI RAHAYU Subari Subari Sugiyanto - Sulistyowati Sulistyowati, Riny Sumariyah Sumariyah Suminah, - SURVIVAL - - Suryono Suryono Sutikno, Bambang Sutrisno, Sutrisno Syafitri, Diva Kaila Syah, Iwan Nur Dian Syahrorini, Syamsudduha Syaifudin, Ahmad Bahron Syaikhuddin, Muhammad Miftakhul Takatoshi Toyoda Tampubolon, Bahroin Idris Tamrin Fathoni Titiek Suheta Toshioh Fujibuchi Tri Winarni Agustini Tri Wulan Tjiptono Trisna Budiwati Tuffahati, Andira Shafa Tunggul Drajat Mulatomo Vincensius Gunawan S.K. Virgia Ningrum Fatnar, Virgia Ningrum VITA FIBRIYANI, VITA Wahyu Edy Wibowo, Wahyu Edy Wahyu S. Budi Wahyu Setia Budi Wati, Sulistyowati Sulis Widi, Sayekti Nugrahaning Yanto, Dwi Yanurita Dwihapsari, Yanurita Yati Hardiyanti Yoel Midel Leitabun Yunianti, Nina Yunus Abu Bakar, M. Yusuf HR, Mohammad Zaenal Arifin Zaenul Muhlisin Zakaria, Moch. Bagus