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Usman Malik
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 usman.malik@lecturer.unri.ac.id
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+62811756227
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kfi@ejournal.unri.ac.id
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Jurusan FMIPA Universitas Riau Kampus Bina Widya Km 12,5 Simpang Baru Pekanbaru
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Kota pekanbaru,
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INDONESIA
Komunikasi Fisika Indonesia
Published by Universitas Riau
ISSN : 14122960     EISSN : 2579521X     DOI : 10.31258/jkfi
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
KFI mempublikasikan artikel hasil penelitian dan review pada bidang fisika, namun tidak terbatas, yang meliputi fisika murni, geofisika, plasma, optik dan fotonik, instrumentasi, dan elektronika, dan fisika terapan (aplikasi fisika).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 10, No 7 (2013)" : 5 Documents clear
RESERVOIR STEAM FLOOD MODELING BASED ON 4D SEISMIC AND ROCK PHYSICS Muhammad Edisar; Usman Malik
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (582.626 KB) | DOI: 10.31258/jkfi.10.7.483-500

Abstract

Reservoir steam flood modeling based on Time Lapse (4D) seismic and Rock Physics data was constructed in Pelangi oil field on central Sumatra Basin. Model used to monitoring and tracking steam flood and production related changes in the reservoir. A model of the reservoir steam flood was constructed for a pattern steam flood in Area X of the field. The model was based on a geostatistical geological model and populated with temperature and porosity. Pressure and saturation properties were added to provide the necessary input for seismic modeling. Through a rock physics model based on the core analysis, the elastic properties (Vp, Vs and density) were determined. These elastic properties were used to determine the seismic response of the model with and without steam flood.The results of the model indicated, that from the rock physics modeling using Gassmann equation, steam flood decreases the Vp by an average of 20-25% in the reservoir sands. Rock physics analysis also shown that shear velocities are also sensitive to steam flood, with an average decrease of 12%. However, the Gassmann calculation results shown that Vs is insensitive to steam flood. This discrepancy is probably caused by Gassmann's assumptions that no chemico-physical interactions exist between the rocks and pore fluids. Time shifts in seismic modeling events provided an indication of the presence of steam flood in the overlying reservoir. The relationship between time shift and steam thickness was strong for thick steam, but it was not possible to distinguish thin steam zones from thick hot oil zones solely on the basis of time shift. At the same time, tuning between the steams related and geologically related seismic events influenced seismic amplitudes. It appears that a combination of attributes is necessary to resolve the effects of steam on the 4D seismic data acquired over of the field.
Investigation on the MHz-THz Radiation Field Regime Absorption in Cancer-Health Cell Tissue Muhamad Hamdi; Usman Malik
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (806.833 KB) | DOI: 10.31258/jkfi.10.7.497-508

Abstract

This paper focuses on the thermoregulation rise due to exposure of the MHz-THz radiation field regime in cancer-health cell tissue. In fact it may occur some processes such as absorption, transmission, reflection and scattering when this radiation interacts with tissue. It depends on the exposure power source. During in cell tissue there is basically the existence of this radiation field contribution to the cell tissue bioelectric and bio magnetic field result in heat production rate. It has a source from excitations of cell macromolecule photonic-phonon vibrations. The self cell tissue has the periodic bio potential with a small cellular volume results in the bioelectric field. This main reason we investigate and solve the simultaneous equations using Maxwell, heat conduction and sinusoidally modulated intensity equation with spectral method. We assume a small tissue piece to form the spherical or cylindrical cell membrane layer. Absorption involves the extraction of vibration energy from MHz-THz radiation regime field by a cell macromolecular species; the vibration must cause a change in the cell electric dipole moment. Energy absorption is the primary mechanism that allows radiation field of MHz-THz source to produce physical effects on tissue for treatment purposes. While transitions between two energy levels of a molecule that are well defined at specific THz wavelengths could serve as a spectral fingerprint of the cancer molecule for diagnostic purposes.
KARAKTERISASI DIFFRAKSI SINAR-X (XRD) MATERIAL FERROELEKTRIK BARIUM TITANAT (BaTiO3) Rahmi Dewi; Krisman '; Usman Malik; Fauzan '
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.023 KB) | DOI: 10.31258/jkfi.10.7.513-515

Abstract

Ferroelectric material Barium Titanat (BaTiO3) has been made with the comparison of 1:1from chemical reactionof Barium Carbonat (BaCO3) and Oxide Titanium (TiO2). The sample at pra-sinter at temperature of 400oC and printed in the form of pellets.The pellet were anneled with the temperature of 700oCand then characterized using XRD. The results of characterization using XRD was described on a graph between the intensity versus 2 theta angle. TheXRDresultsBaTiO3 before annelingdoes not show any peaks, this mean that the structure of BaTiO3before annelingis amorfus structure. The XRDresult BaTiO3 after annelingshowedsome peaks, the positions of the peaks on 2θ are 23.32°, 32.72°, 38.40o, 45.52o, 52.04°, 57.80o. After anneling, the peaks become wider, this mean the samples become crystaline in structure. At standard temperature (0oC to 320oC) the samples of BaTiO3 has tetragonal formbut on the temperature 700oC after being anneledit changed into Cubic.
FAKTOR-FAKTOR FISIS YANG MEMPENGARUHI AKUMULASI NITROGEN MONOKSIDA DAN NITROGEN DIOKSIDA DI UDARA PEKANBARU Riad Syech; Sugianto '; Anthika '
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (684.732 KB) | DOI: 10.31258/jkfi.10.7.516-523

Abstract

Telah dilakukan penelitian tentang faktor-faktor fisis yang mempengaruhui akumulasi Nitrogen monoksida dan Nitrogen dioksida di udara Pekanbaru pada stasiun Kulim, Sukajadi dan Tampan dengan menggunakan metodologi interpretasi data. Pengabilan data akumulasi NO dan NO2 konsentrasi NO dan NO2 dilakukan dengan menggunakan alat Nitrogen Oksida Analyzer seri APNA 360 di Laboratorium Udara Kota Pekanbaru. Data yang diamati adalah data harian dari bulan Januari tahun 2010 sampai dengan bulan Desember tahun 2012 . Hasil penelitian menunjukkan bahwa konsentrasi NO dan NO2 tidak pernah sama di setiap bulannya. Konsentrasi terendah NO terdapat di stasiun Kulim sebesar 2,43 μg/m3 pada tahun 2012 dan konsentrasi tertinggi terdapat di stasiun Sukajadi sebesar 55,51 μg/m3 pada tahun 2010. Konsentrasi terendah NO2 terdapat di stasiun Tampan sebesar 3,99 μg/m3 pada tahun 2010 dan konsentrasi tertinggi terdapat di stasiun Sukajadi sebesar 92,99 μg/m3 pada tahun 2010. Suhu, kelembaban udara dan kecepatan angin mempengaruhi besarnya konsentrasi NO dan NO2. Suhu udara yang tinggi, kelembaban udara yang rendah serta kecepatan angin yang tinggi menyebabkan konsentrasi NO dan NO2 rendah, sedangkan suhu udara yang rendah, kelembaban udara yang tinggi dan kecepatan angin yang rendah menyebabkan konsentrasi menjadi tinggi.
STUDI KELAYAKAN PENGGUNAAN SEL SILIKON SEBAGAI PENGUBAH ENERGI MATAHARI MENJADI ENERGI LISTRIK Walfred Tambuhan; Maksi Ginting; Minarni '
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.431 KB) | DOI: 10.31258/jkfi.10.7.528-533

Abstract

Telah dilakukan penelitian tentang “Studi Kelayakan Penggunaan Sel Silikon sebagai Pengubah Energi Matahari menjadi Energi Listrik” dengan metoda eksperimen. Eksperimen dilakukan dengan cara merangkai dioda silikon selinder ke rangkaian bentuk paralel dan bentuk seri pada pelat rangkaian PCB, kemudian rangkaian dimasukkan kedalam suatu kotak terbuat dari kayu yang diisolasi dengan isolator kardus. Kotak tersebut ada yang dibuat terbuka tanpa pelat kaca dan ada yang dibuat tertutup dengan pelat kaca kemudian diletakkan ke tempat yang bebas cahaya matahari jatuh dengan mengarahkan dioda silikon tegak lurus terhadap cahaya matahari jatuh lalu diamati arus listrik yang dihasilkan dioda silikon setiap selang waktu 10 menit. Hasil yang diperoleh, arus listrik dihasilkan bernilai maksimum untuk dioda sambungan paralel dan terbuka tanpa penutup pelat kaca sebesar 102,9 x 10-2 milli ampere dengan energi listrik rata-rata yang dihasilkan 35,2 x 10-3 Joule pada temperatur 39oC sedangkan arus listrik minimum dihasilkan dari rangkaian dioda bentuk seri tertutup dengan pelat kaca sebesar 21 mikro ampere dengan energi listrik rata-rata dihasilkan sebesar 51 x 10-5 Joule. Dari hasik-hasil tersebut yang lebih bagus dan lebih layak digunakan untuk mengubah energi matahari menjadi energi listrik adalah dioda silikon bentuk sambungan paralel terbuka tanpa memakai penutup pelat kaca.

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