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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 339 Documents
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Search for New Astronomical Site in Indonesia: III. Astronomical Seeing Condition in West Timor Budi Dermawan; Putra Mahasena; Taufiq Hidayat; Muhammad Irfan
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Global meteorological study over Indonesia has identified that Nusa Tenggara Timur is a good candidate for an astronomical site. West Timor, in the eastern region of Nusa Tenggara Timur, is subsequently selected to be surveyed both for topographical and sky quality. The latter is studied theoretically in term of transmittance of tropical atmosphere. This work presents in situ measurement undertaken for Kupang (longitude: 123° 34¢ 4² E, latitude: 10° 10¢ 19² S) to derive the seeing values. The same procedure was also performed for Lembang, West Java (longitude: 107° 36¢ 58² E, latitude: 6° 49¢ 33² S) in order to quantitatively compare the proposing site to the established one. Our result shows that Kupang has about 50% better seeing condition than that of Lembang. 
Migration of Near Earth Asteroid to Jovian-Crosser Asteroid : Case Study 3552 Don Quixote Suryadi Siregar
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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It is generally recognized that main-belt asteroids (MBAs) and nuclei of extinct comets are the two main sources for the Near-Earth-Asteroids (NEAs). Theoretical studies of NEAs dynamics and numerical modelling of their orbital motions showed that the resonance mechanism for supplying NEAs is quite sufficient to sustain this population. Asteroid 1983 SA, also known as 3552 Don Quixote, is one of Near Earth Asteroids (NEAs) and the most probable candidates for NEAs of the cometary origin. In this work, an investigation on the evolution of the orbit is done by using the SWIFT subroutine package, where the gravitational perturbations of eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are considered. Migration of asteroid 3552 Don Quixote from Near Earth Asteroids (NEAs) to Jovian-crosser asteroid is found.
Downward Propagating Equatorial Kelvin Wave over the Eastern Indian Ocean as Revealed from Radiosonde and GPS Radio Occultation (CHAMP) Data Noersomadi Noersomadi; Tri Wahyu Hadi
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Vertical propagation of equatorial Kelvin wave and its correlation with convective activity over the eastern Indian Ocean were investigated through analyses and inter-comparisons of radiosonde and GPS/CHAMP occultation data. The radiosonde data from 80 balloon launchings were obtained in the period of August 5 to 14, 2005 over the region of 1.640 N - 6.20 S, 88.20 E- 97.340 E surrounding the cruise track of R/V Mirai during Tropical Ocean and Climate Study (TOCS) campaigned. Results of radiosonde data analyses show a variation in the height of cold point tropopause (CPT) associated with Kelvin wave activities. In addition, coexisting strong convective activities were also detected during August 9 to 11, 2005.  The characteristics of equatorial Kelvin wave were further investigated by fitting a sinusoidal approximation by assuming zonal wave number 1 and 2 to the GPS/CHAMP temperature perturbations using non linear inversion algorithm. It is found that the periodicity of observed Kelvin wave is about 5 - 6 days. Inter-comparisons of low-pass filtered of height-time cross section of perturbation temperature from both radiosonde and GPS/CHAMP data showed downward propagation Kelvin wave, which was more pronounced during August 11 to 14, 2005. Furthermore, an increase in the potential and kinetic energy of the downward propagating Kelvin wave was observed prior to the occurrence of strong convection, which is believed as convectively coupled equatorial Kelvin wave.
Simulation of Influenza Pandemic Based on Genetic Algorithm and Agent-Based Modeling: A Multi-objective Optimization Problem Solving Ria Lestari Moedomo; Adi Pancoro; Jorga Ibrahim; Adang Suwandi Ahmad; Muhammad Sukrisno Mardiyanto; Mohammad Bahrelfi Belatiff; Hengki Tasman
Jurnal Matematika & Sains Vol 15, No 2 (2010)
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This paper describes the analysis, design and development process of simulation software for the Avian Influenza (H5N1) viruses mutation. Influenza Pandemics, which have occurred since 1729, caused by mutation (antigenic drift) and recombination (antigenic shift) of Influenza viruses. The purpose of this research is to define the modeling of virus mutation causing the Influenza Pandemic phenomena. Additionally, the objective of this simulation is to obtain all possible virus strains might be formed from mutation, the scope within this article, which can potentially trigger Influenza Pandemic. These new strains could then be utilized to support the vaccine planning process. The Influenza Pandemic simulation program can be developed based on Genetic Algorithm method, for solving this multi-objective optimization problem. By utilizing the Genetic Algorithm approach, the chromosome solution and fitness values/functions of Influenza Pandemic stages are defined and the maximum fitness values are to be searched. The simulation result of H5N1 mutation gave 3 (three) best fitness values and a more dynamic mean fitness values, including best fitness value from several mutations combination. Simulation program was developed by utilizing MATLAB© software, with Genetic Algorithm Toolbox provided.
Senyawa Turunan Organotimah: Sintesis dan Struktur Kristal Trifeniltimah Pentasiano Propenida [(C6H5)3Sn][C3(CN)5] 2H2O Asrial Asrial; Frank T. Edelmann
Jurnal Matematika & Sains Vol 15, No 2 (2010)
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Triphenyltin-1,1,2,3,3-pentacyano prophenide compound, [(C6H5)3Sn][C3(CN)5]2H2O, is the stable organometallic complex, which is a macromolecule compound. This compound is synthesized from triphenyltin chloride, (C6H5)3SnCl, and silver pentacyano prophenide, AgC8N5, in tetrahydrofuran (THF). This compound has crystal system of monoclinic with space groups of P2(1)/n with a = 825.37(10); b = 2092.91(03); c = 1484.07(10) pm, a = g = 90,00° and b =103.84(10)o; and cell volume = 2.49(05) nm3. The compound consists of [C3(CN)5]- anion and [(C6H5)3]+ cation in slightly different packing modes.
Probability of Finding Terrestrial Planet Within Habitable Zone of Extrasolar Planetary System Ratna Satyaningsih; Taufiq Hidayat; Avivah Yamani; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 2 (2010)
Publisher : Institut Teknologi Bandung

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Habitable zone in a planetary system is defined as the region around a star where life-supporting planets can exist. Typically it requires the presence of liquid water on the planetary surface. Considering the formation of planetary systems, we investigate how stellar mass affects the probability of terrestrial planets formed within habitable zone. We use our Planetary System Generator code (Yamani, 2007) to generate planetary systems by investigating its sensitivity through several parameters, such as stellar mass, stellar luminosity, and effective temperature. The probability of finding terrestrial planets within the habitable zone of extrasolar planetary system has been then calculated. We selected the exoplanet systems: Gl 581, HD 128311, 55 Cnc, 47 UMa, and Ups And-like to evaluate the presence of planets within their habitable zone. 
A Monte Carlo Modeling of Planetary Formation: A Case of 47 Ursae Majoris System Avivah Yamani; Taufiq Hidayat; Ratna Satyaningsih; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 2 (2010)
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This paper presents a Monte Carlo simulation, using Planetary System Generator, which has been built based on a simple accretion model by Dole (1970) and by considering the present structure of the Solar System. Data of known extrasolar planets have also been taken into account.   It was then applied to generate 47 Ursae Majoris (47UMa)-like planetary systems. The results are subsequently compared to the observed data of 47UMa. The dynamical evolution as well as the stability of the system have been evaluated by using a n-body formalism accounted for in our simulation. The generated system reproduced approximately the observational data and suggests that some other accompanying planets may exist. The orbital evolution is also found to be stable within the current age of the system.
Keanekaragaman Kumbang Lucanid (Coleoptera:Lucanidae) Pada Berbagai Ketinggian Tempat di Hutan Konsensi Unocal Gunung Salak, Jawa Barat Roni Koneri; Dedy Duryadi Solihin; Damayanti Buchori; Rudi Tarumingkeng
Jurnal Matematika & Sains Vol 15, No 2 (2010)
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Lucanids beetles play a very important role in forest ecosystem and as an crucial element of biodiversity.   The objectives of the research were to study the effects of different altitutdes on the community of lucanids beetles. Beetles collection was conducted by hand collection.  Insect  collections were conducted monthly during 12 months. This result identified 12 species of Lucanids beetles with 1.133 individuals. Altitude was found to have a strong effect on Lucanids beetles community. Redundancy analysis identified that total volume of coarse woody debris in the selected locations was recorded as key environmental factor influencing community structure of lucanids beetles. Based on canonical correspondence analysis, the distribution of the beetles were affected by the volume of coarse woody debris in decay class 2.
Sifat Optik Lapisan Tipis In2O3 yang Ditumbuhkan dengan Metode MOCVD Horasdia Saragih; Hasniah Aliah; Euis Sustini; Albert Manggading Hutapea
Jurnal Matematika & Sains Vol 15, No 2 (2010)
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The In2O3 thin films have been deposited on glass substrate by MOCVD method using In(TMHD)3 metal organic precursor. The growth parameters, such as bubbler temperature 200oC, bubbler pressure 260 Torr, substrate temperature 300oC, flow rate of Ar gas 50 sccm, flow rate of O2 gas 50 sccm, chamber pressure 2x10-3 Torr, and duration of growth from 120 to 180 minutes were used. Three In2O3 thin films with different thicknesses, i.e. 531, 434, and 404 nm were resulted. Optical transmissions of the thin films in the visible wavelength were above of 80%, and not significantly influenced by thickness difference up to about of 127 nm. The optical band gap and Urbach energy band of thin films were 3,76-3,80 eV and 0,20-0,22, respectively. The thin films deposited have indirect forbidden transition.
Note on Superposition of Renewal Processes Suyono Suyono; J.A.M. van der Weide
Jurnal Matematika & Sains Vol 15, No 2 (2010)
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In this paper we discuss distributional properties of superposition of renewal processes. Firstly, as a special case, we discuss probability distributions of a superposition of Poisson processes and its generalization, namely the sum of independent compound Poisson processes. In this case we have explicit expressions for their probability distributions. Secondly, we discuss the statistical moments of general superposition of renewal processes. We also discuss the statistical moments of the sum of independent renewal reward processes, a generalization of a supervision of renewal processes. The results are presented in the form of Laplace transforms. Finally we present the distributions of recurrence times of a superposition of renewal processes.

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