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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 334 Documents
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Problem Fraksionasi Isotop 15 N/14 N dan Mekanisme Pelepasan Non-Thermik di Atmosfer Titan T Hidayat
Indonesian Journal of Physics Vol 14 No 4 (2003): IJP Vol. 14 No. 4, October 2003
Publisher : Institut Teknologi Bandung

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Abstract

Observations of HC15N in the atmosphere of Titan at millimeter and submillimeter wavelengths, combined with the previous observations of HC14N have yielded the isotopic ratio of 15N/14N. This result, unexpectedly, shows that Titan is signicantly enriched in 15N by a factor of 4.2 (Marten et al. 1)), compared to terrestrial value. The data are a key element to trace the formation and evolution of Titan's atmosphere as well as its relation to the global history of the Solar System. To interpret this isotopic anomaly, various plausible mechanisms, leading to isotopic fractionation, are explored. Upper limit of initial nitrogen abundance on Titan is retrieved.
Kompaktifikasi dari Teori Superstring dan Teori-M Freddy P. Zen; Bobby E. Gunara; Bintoro A. Subagyo; Zulfi Zulfi; Asep Y. Wardaya
Indonesian Journal of Physics Vol 14 No 4 (2003): IJP Vol. 14 No. 4, October 2003
Publisher : Institut Teknologi Bandung

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Abstract

Compactification of the five consistent supertring theories, i.e. type IIA, type IIB, type I, heterotic SO (32) , and heterotic E8 ⊗ E8 on six dimensional compact manifold are considered. Explicitly we discuss compactification of heterotic string on toroidal, orbifold and Calabi-Yau manifold. It yields a mass spectrum on low energy from those compactification. We also discussed SO(2N) and SU(N) enhanced gauge symmetry as a byproduct of compactification on M theory (11 dimensions) which is dual with type IIA superstring theory (10-dimensions). In this case, we can get enhanced gauge symmetry at singular point in the moduli space on a K3 surface.
String Heterotik pada Orbifold T6 / ℤ3 Freddy P. Zen; Bobby E. Gunara; Asep Y. Wardaya
Indonesian Journal of Physics Vol 14 No 4 (2003): IJP Vol. 14 No. 4, October 2003
Publisher : Institut Teknologi Bandung

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Abstract

Dipelajari kompaktifikasi teori string heterotik E8 × E8 berdimensi sepuluh pada orbifold T6 /ℤ3 . Pada orbifold tersebut diperoleh Ɲ = 1 vacua dari teori string heterotik dalam empat dimensi yang merupakan model realistik secara fenomenologis. Dalam paper ini secara khusus dibahas mengenai model grup gauge E6 × SU(3) × E6 × SU(3) yang diperoleh sebagai hasil penguraian akar kisi dari E8 × E8. Hasilnya, terdapat empat model state dari energi titik nol yaitu R, NS, R-NS, dan NS-NS.
Pencarian Data Dengan Indeks Takterurut Menggunakan Algoritma Kuantum Freddy P. Zen; Ardian Nata Atmaja; Susanto Sigit
Indonesian Journal of Physics Vol 14 No 4 (2003): IJP Vol. 14 No. 4, October 2003
Publisher : Institut Teknologi Bandung

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Abstract

This paper will discuss about Grover algorithm for searching a record in a database. There is only one way to search a record in a database with N unordered indices, which is by checking each index and comparing with the record that will be searched. This classical algorithm uses an oracle as much O(N). By using Grover algorithm and quantum parallelism, which will solve the searching problem with uses an oracle as much O(vN) . Grover algorithm is more efficient compared to the classical algorithm if the N number is bigger.
Water Saturated Layer Beneath Volcano and its Implications to Volcanic Activity T. Kagiyama
Indonesian Journal of Physics Vol 15 No 1 (2004): Vol. 15 No.1, January 2004
Publisher : Institut Teknologi Bandung

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Abstract

In recent years, a low resistive layer has been revealed by magneto-telluric surveys beneath some volcanoes in Japan. This layer is interpreted to be saturated by water, or altered by hydrothermal activity. The influence of underground water is important for volcanic activity, because many precursors of volcanic eruptions occur by an interaction of magma or volcanic gas and underground water, and a style of volcanic eruptions is controlled.
Role of Physics Community for the Development and Advancement of Physics Education in the Globalization Era Khalijah Mohd. Salleh
Indonesian Journal of Physics Vol 15 No 1 (2004): Vol. 15 No.1, January 2004
Publisher : Institut Teknologi Bandung

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Abstract

Knowledge of science generally and physics in particular is no longer the prerogative of the practicing scientists or physicists but has to be disseminated to the public. Thus physics education can be expected to play an important role in the era of globalisation. Physics education provides a person with the knowledge and understanding about how the physical world works. The knowledge and skills required by individuals differ, as different individuals need different levels of physics knowledge and skills. The decline in physics enrolment in schools and subsequently in institutions of higher learning has caused a serious shortage of candidates for physics teaching. Subsequently schools have only 4.7 percent teachers with background in physics. The balanced is made up by non-physics option teachers. These non-option physics teachers want to strengthen their physics background knowledge and understanding, and experimental skills. Science teachers and curriculum planners especially at school level are left on their own to conceptualise science and translate to the best of their ability the science curriculum content into classroom activities. Their understanding of what science is depends on what they have learnt from their professors or teachers.The presence of the physics community in the education sector is urgently needed. Physicists are the ones who better understanding of the nature of physics, how to think physics and how to approach physics experiments and problem solving. These aspects of physics make up the culture of physics. Physics societies need to include in their conferences or seminars topics related to the education and training of future physicists, their career development, and ultimately public awareness of physics to ensure a continuous supply of physicists for future needs. What need to be noted is that when teachers interact with physicists, they will sooner or later identify themselves with physics and the physics community. Only then teaching physics becomes more meaningful and satisfying. Teachers can be expected to be more committed to and responsible in teaching physics to their pupils. Physics education has a role in human resource development that a country needs to achieve the nations’ developmental goals. There are different levels of physics that are needed by different groups of people. The fact that the system of education could not really overcome the perceptions that physics is difficult dry and dull requires input by the physics community to help inject the kind of excitement that physicists have when they do physics. There are many roles that the physics community can play towards curriculum development, innovating new approaches to physics teaching and learning. Physics societies are invited to give space for physics education in their technical meetings so as to bridge the gap that currently divide the physics community from the physics educators and the public at large.
Analytical versus Numerical Calculations of Physical Problems, The Benefits of its Combination, Example: Application of the Heat Transfer Equation in Electrical Engineering Hans-Dieter Liess
Indonesian Journal of Physics Vol 15 No 1 (2004): Vol. 15 No.1, January 2004
Publisher : Institut Teknologi Bandung

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Abstract

Due to the available powerful calculation tools, in present day engineering physical and technical problems are more and more solved with numerical methods. Analytical calculations are left for some few basic questions to show only the physical laws behind. The potential of the possibilities of numerical approaches need not to be emphasized. The disadvantage of the pure application of numerical approaches, however, is the fact, that the physicals laws behind are not so easy to visualize, the results art not so easy to generalize, and the storage of the information requires mostly a lot of data. This paper would like to show at some examples the advantages the combination of both methods. One example is the application of the heat transfer equation at conductors and cable harness for vehicles, like cars or airplanes. Up to now the selection of cables is based on data, which were not particular optimized for mobile application where the length is typically short and low weight is important. More concern about this matter, new materials and diverting shapes require the optimization of the possible electrical load under thermal considerations. Other examples are the calculation of the melting behavior of electrical fuses or the thermal conditions in automatic electrical heated production processes. The key part of this approach is the calculation of the heat transfer by the Finite Volume Method (FVM) and the approximation of the calculated data by the so-called "simplified equations". These simplified equations were received by analytical calculations of the basic heat conduction equation. The required adaptation of the numerical and measured results were done with properly adapted fitting algorithms on the basis of the elaborated analytical solutions, a process which was leading to an enormous reduction of data. As a result it became possible to describe the applied tasks by a few characteristic constants. Another approach for an analytical solution with a numerical calculation process is the determination of the so-called "properties of mixed magnitudes". As an example this principle has been applied for the numerical calculation of electrical multi conductor containing cables. This way allowed predicting the thermal behavior of any cable harness with the required precision.
Ab initio Computation Revisited: Fweb Based Code for Educational Purposes Hermawan K. Dipojono
Indonesian Journal of Physics Vol 15 No 1 (2004): Vol. 15 No.1, January 2004
Publisher : Institut Teknologi Bandung

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Abstract

We present an fweb based ab initio computation for educational purposes. As such we emphasized more on simplicity but without loss of generality and on readability than on efficiency of the code for this nontrivial problem. In order to check that our code worked we have tested the code to evaluate the total energies for some elements. We used our code to evaluate the total energies of hydrogen, carbon, oxygen atoms and O+. The total energies from our computation were compared to the available data from US National Institute of Standard and Technology (NIST). The results showed that our fweb based ab initio code has performed excellently. For the development of the code we used the density functional theory with local density approximation which gave a relatively simple but accurate prescription for the total energy of a system of electrons and nuclei. The rate of convergence to the final total energy will be presented in terms of total energy versus number of iterations with mixing factor α as a parameter. In the sense of self-consistent computation α is a measure of mixing between the previous and the new density value in order to get the density value for the next step computation in the iteration. Our computation shows that α = 0.55 gives the best performance.
Numerival Simulation of Vortex Dynamics in superconductor with Using Time Dependent Ginzburg Landau Equation Harsojo Harsojo; Pekik Nurwantoro; Muslim Muslim
Indonesian Journal of Physics Vol 15 No 1 (2004): Vol. 15 No.1, January 2004
Publisher : Institut Teknologi Bandung

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Abstract

The study of vortex dynamics in type II superconductors has drawn attention many people for the last ten years especially since the discovery of high Tc superconductor materials. This basics information are importance to study the role of vortex dynamics in some of the superconductor quantities. In this paper the time dependent Ginzburg-Landau (TDGL) equations has been used to describes the vortex dynamics under an external magnetic field varies linearly with time limited to two dimension. From the numerical solution we inspect the existence of the vortex quantization, the properties of magnetization of the sample, and calculate the number of vortices based on the related supercurrent and free energy produced in associated the related order parameter. The calculation result indicates clearly the existence of vortex quantization related to the appearance of oscillation of magnetization as a function of external field. The possibility of studying the effect of adding pinning and holes together with the varying of the temperature are discussed.
20-line multi-wavelength laser source at 1600nm region with Brilloun/erbium fiber laser S. W. Harun; H. Ahmad
Indonesian Journal of Physics Vol 15 No 2 (2004): Vol. 15 No.2, April 2004
Publisher : Institut Teknologi Bandung

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Abstract

The operation of the Brillouin/erbium fiber laser (BEFL) in the long wavelength band (L-band) is experimentally demonstrated. The Stokes frequency is shifted 10GHz from its Brillouin pump with a tunability from 1598-1612nm for the single wavelength BEFL. Multiple wavelength generation in the BEFL is realised by adding two 3-dB couplers, which are joined in a reverse-S arrangement to take a portion of the generated BEFL signal and re-inject it into the SMF to seed a cascaded BEFL line in the same direction as the first BEFL line. 20 lines including the anti-Stokes are obtained with a maximum Brillouin pump and 980-nm pump power of 8.8mW and 92mW, respectively. The L-band BEFL has the potential to be used in future wavelength division multiplexing (WDM) communication system.

Page 10 of 34 | Total Record : 334

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