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All Journal International Journal of Electrical and Computer Engineering Reaktor BERKALA FISIKA SAINS DAN MATEMATIKA JURNAL SISTEM INFORMASI BISNIS Jurnal Sains Materi Indonesia YOUNGSTER PHYSICS JOURNAL Scientific Journal of Informatics Register: Jurnal Ilmiah Teknologi Sistem Informasi Journal of Physics and Its Applications
Vincensius Gunawan S.K.
Jurusan Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Astronomy Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Physics

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Journal : BERKALA FISIKA

 1 
MAGNETIZATION AND POLARIZATION PROFILE IN PML-TYPE MAGNETOELECTRIC MULTIFERROICS WITH CANTED SPIN SYSTEM Gunawan, Vincensius; Stamps, Robert L
BERKALA FISIKA Vol 15, No 1 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

We calculate the profile of both magnetization and polarization of a PML-typemagnetoelectric multiferroics which allow the magnetization of sub-lattices to be canted.  Thecalculation is started by deriving the Landau energy density and followed by solvingsimultaneously three equilibrium equations which respect to polarization, magnetization andcanting angle.   It is predicted that magnetoelectricity give rise to a “bump” in polarization profile. It is also calculated that the application of a magnetic/an electric field will also influence thepolarization/magnetization of the material.Keywords:  multiferroics, magnetization and polarisation
Rekayasa Bahan untuk Meningkatkan Daya Serap Terhadap Gelombang Elektromagnetik dengan Matode Deposisi Menggunakan Lucutan Korona Gunawan S.K., Vincensius
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The aim of this research is to engineer soft steel  which have low value absorbance of electromagnetic waves become  a material which have higher value absorbance.  The method used is deposition by corona discharge. Corona discharge generated in free space will ionisize air producing nitrogen ion that can be deposite in basic material.  This process will increase the density in the surface of basic materials and then will make the value of linear absorbance constant of basic material become higher.  The optimal result in this research is the raise of  the value of linear absorbance constant by 54,3 % with the time of deposition in 30 minutes, the voltage of electrode 5 kV and  distance between electrodes 6 mm.
PEMBUATAN KURVA ISODOSIS 2D DENGAN MENGGUNAKAN KURVA PERCENTAGE DEPTH DOSE (PDD) DAN PROFIL DOSIS DENGAN VARIASI KEDALAMAN UNTUK TREATMENT PLANNING SYSTEM Nurul Ihya, Farhatin; Anam, Choirul; Gunawan, Vincensius
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Treatment Planning System (TPS) is very necessary in radiotherapy planning to give the accurate radiation dose given to the patient.  In the TPS, 2D isodose curve is used to determine thedose distribution with the same rate at a certain distance from the radiation source.  The isodosecurve is obtained from the Percentage Depth Dose (PDD) and dose profile.  Measurement data ofPDD and dose profiles obtained from Kensaras Hospital in Semarang.  The PDD and dose profiledata were obtained from testing the water phantom for soft tissues such as muscles or other bodytissues.  Dose profile curve which is used  is at a various depth, such as: 1.5 cm, 5 cm, 10 cm, 15cm, 20 cm and 25 cm with an area of 5 x 5 cm2field, 10 x 10 cm2, 15 x 15 cm2, 20 x 20 cm, 30 x 30cm2 and 40 x 40 cm2.  At each depth of curve profile, the dose at the surface is calculated  andnormalized using  interpolation and normalized by narrowing techniques. 2D isodose curveobtained from the weighting technique to the calculation of the dose profile curve. In the field sizeof 5 x 5 cm2 and 10 x 10 cm2, isodose curve formed better in the absence of horn at the edge of thecurve.  In the field size larger than 10 x 10 cm2 there are horns on the edge of the curve at thelower depths.Keywords : Treatment Planning System (TPS),  2D Isodose curve, Percentage Depth Dose (PDD),Dose profile.
Co-Authors Abd. Rasyid Syamsuri Adian Fatchur Rochim Agung Cahyono Agus Purwanto Agus Subagio Aris Kusnandar Asfan Muqtadir Choirul Anam AM Diponegoro Dewi Tri Nugraheni, Dewi Tri Farhatin Nurul Ihya Hendri Widiyandari Indras Marhaendrajaya Ircham Ali Kamsul Abraha Kusworo Adi Mahfudz Fauzan Ngurah Ayu Ketut Umiati Priyono Priyono Rachmad Gernowo Robert L Stamps Ryan Kurniawan Singgih Sugiarto, Singgih Suryono Suryono Susilo Adi Widyanto