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Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA
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INDONESIA
Indonesian Journal of Physics (IJP)
Published by Institut Teknologi Bandung
ISSN : 23018151     EISSN : 29870828     DOI : https://doi.org/10.5614/itb.ijp
Core Subject : Science, Engineering,
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering
Indonesian Journal of Physics welcomes full research articles in the area of Sciences and Engineering from the following subject areas: Physics, Mathematics, Astronomy, Mechanical Engineering, Civil and Structural Engineering, Chemical Engineering, Electrical Engineering, Geotechnical Engineering, Engineering Science, Environmental Science, Materials Science, and Earth-Surface Processes. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 313 Documents
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Karakteristik Ketebalan Optik Aerosol di Bandung Tuti Budiwati; Sumaryati Sumaryati; Iis Sofiati
Indonesian Journal of Physics Vol 12 No 4 (2001): Vol. 12 No.4, Oktober 2001
Publisher : Institut Teknologi Bandung

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Abstract

We’ve been measured the radiation intensity on the clear by sun photometer model MS-120 with wavelength of λ=368, 500, 675, and 778 nm from 1996 to 1998 in LAPAN-Bandung. The data of intensity of radiation were calculated to become the data of optical depth and atmospheric turbidity. From the calculated results apparently the aerosol optical depth was influenced by the source of pollutant particle and relative humidity. The optical depths of aerosol on the wavelength region 500 nm in 1996, 1997 and 1998 have values 1.080; 0.923 and 0.913 respectively. The magnitude of optical depth of aerosol influence to atmospheric turbidity. The coefficient of atmospheric turbidity on wavelength 500 nm in Bandung has range from 0.25-1.20 during dry season (from June to October) from 1996-1998.
Convergent Energy States and Wave Functions of Helium Atom in an L2 Basis A. Kartono; T. Winata
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

The convergence of energy states and wave functions of helium atom is presented. The energy states are obtained by diagonalizing the helium Hamiltonian in a non-orthogonal Laguerre basis. Some of the energy states will be exact discrete eigenstates, others will be a discrete representation of the continuum states. As the basis size N increases the lowest bound states in energy states converge to the exact eigenstates, whereas the positive energy states provide an increasingly dense discretization of the continuum. The convergence of wave functions is obtained by the Gauss-Pollaczek quadrature method.
Perturbative Calculation for the Heavy Meson Matrix Element L. T. Handoko
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

We argue that the perturbative approach can be used to compute non-factorizable corrections to exclusive radiative B meson decays in the heavy quark mass limit. The explicit computation of first order QCD corrections is given. These, or the so-called hard spectator, corrections is done up to %(αs) in the leading-twist approximation. These results are combined with the already done renormalization group effect in the appropriate Wilson coefficients, the vertex corrections and the annihilation contributions to obtain a complete %(αs) improvements to the lowest order decay width. The result is particularly applied to radiative decay B → ργ which the analysis is done for its branching ratio, isospin symmetry breaking and direct CP violation.
Alternative Model for Quarks and Leptons Using Extra-Dimensional Effective Potential Johannes V. Djoko Wirjawan
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Assuming that the weak-isospin, particle-type (quark or lepton), color, and generation are internal quantum numbers, we may generate those quantum numbers by cloning the Dirac operator in four flat extra dimensions and trapping fermions in a harmonic-oscillator potential in the extra dimensions. Particle identification is obtained from the group representation multiplets associated with the choice of the trapping potential in the extra dimensions. The proposed model predicts the existence of unknown particles that might be considered as dark matter candidates. The interaction of the particles and the electro-weak bosonic fields which are treated as external fields will be discussed.
Pengembangan Kode Komputer untuk Homogenisasi Sel Bahan Bakar Nuklir yang Diperkaya untuk Reaktor Termal Novitrian Novitrian; Zaki Su’ud; Sutrisno Sutrisno
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Like in the most nuclear cell homogenization, integral transport equation is also used to solve the neutron transport problem, especially by using collision probability method. This method has the advantage that for relatively simple geometry the angular integration may be carried out analytically. Neutron transport equation was solved in accordance with the physical neutron characteristic in its energy range. The neutron spectrum calculation used 70 energy group and for thermal energy range the energy was divided into 48 energy groups.For calculation in the fast energy range we used microscopic cross section data from SLAROM library, while for thermal energy range we used experiment data from ENDF/B VI and then we interpreted it with the used of Code System NJOY97.0. As an example calculation we considered one-dimensional cylindrical cell which was divided into 3 regions i.e, for fuel, cladding, and coolant. The nuclear cell homogenization calculation was treated by the use of linear equation.
Numerical Fit to the Ashkin Experiment for the 4-Different Formulas of Volume Momentum Proposed by Abraham, Minkowski, Peierls, and Klima-Petrzilka Sidikrubadi Pramudito; Yuliati Herbani
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

The momentum flux density of electromagnetic radiation in dielectric media (Abraham-Minkowski problem) has not yet been solved while this question seems to be settled for collisionless fully ionized plasma. Therefore, the experiments of Ashkin are analyzed for a numerical evaluation of the total momentum transferred by laser beam to the sphere suspended in a fluid using four competing formulas for volume momentum, given by Abraham, Minkowski, Peierls, and Klima-Petrzilka. It turns out that at least for this condition of high frequency radiation the Minkowski’s formula as predicted by Gordon arrives at the best fit with experiments and no term of Claussius-Mosotti media are involved at this process of radiation forces.
Effect of Annealed Duration and Temperature on Crystallinity of Ta2O5 Thin Films H. Darmasetiawan; Irzaman Irzaman; S. G. Sukaryo; M Hikam; N. P. Bo
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Tantalum oxide (Ta2O5) thin films were deposited on Si(100) and Si (100)/Pt (200) substrates using the chemical solution deposition (CSD) method. X-ray diffraction (XRD) measurement was employed to characterize the films. The growth condition of Ta2O5 was carried out by spin coating at 3000 rpm for 30 seconds, and then by annealing at 900 oC for 4 hours and 15 hours. The crystallinity of thin films were investigated by XRD preferred orientation (001), (010), (100), (200) on Si (100) substrate and (001), (010), (100), (202) on Si (100)/Pt (200) substrate. Increasing the duration of annealing results in better quality of crystalline thin films and the effect of high thermal energy increases the grain size. The orthorhombic structure and crystallinity of Ta2O5 thin films on Si (100) substrates and Si (100)/Pt (200) substrates were analyzed by XRD preferred orientation (001), (010) and (100), giving lattice constants a = 3.708 Å, b = 3.716 Å, c = 4.114 Å.
Pembuatan Polikristal CuGaSe2 dan Penentuan Konstanta Kisinya Irmansyah Irmansyah; A. Harsono Supardjo; Arya Rezavidi
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Copper Galium Diselenide (CuGaSe2) Polycrystal was synthesized from a stoichiometric mixtures of the elements by using Bridgman Horizontal furnace single zoned. Ingot is visually solid and it did not attach on the ampoule walls. X-Ray Diffraction measurements show that the spectra are the Chalcopyrite peaks. The calculated lattice parameters obtained from Cohen Method are a=b= 5.613 Å , c = 11.014 Å and the ratio c/a =1.962
Studi Pembentukan Superkonduktor Ba1-xKxBiO3 Melalui Proses Elektrokimia Rahmat Hidayat; Darminto Darminto; M.O. Tjia
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Superconducting films of Ba1-xKxBiO3 have been synthesized by means of potentiostatic electrochemical method incorporating a post annealing process. The critical temperature was determined from resistivity characterization, while structural characterization was carried out by X-ray diffraction and Scanning Electron Microscopy (SEM) measurements. The resistive transition curves show that Tc0 varies between 10K and 11K and Tcon varies between 13K and 18K depending on the electrode voltage used in the synthesis process. The highest Tc0 of 11K was attained in the sample prepared with electrode voltage of 0,65 V. Further analysis of the data reveals that higher quality sample may result from the synthesis by employing higher electrode voltage and more appropriate annealing process.
Comparison Of SF6 Dissociation Rate Due To Positive and Negative Coronas Rudi Irawan
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Measurements of SF6 dissociation rate due to 75 μA positive and negative coronas have been carried out using a mass spectrometer. The results show that the rates of SF6 degradation and by-product production due to a positive corona are significantly higher than those for a negative corona. The rates of degradation and production of SF6 and gaseous by-products are proportional to the charge transported by the corona.Both positive and negative coronas produce the same major gaseous by-products, SiF4, SO2F2 and SOF2.Besides gaseous by-products, coronas also produce solid by-products, metal fluorides. Due to the impact of high-energy electrons and F¯, the positive electrode is always more coated and damaged than the negative electrode.

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