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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 7 Documents
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Search results for , issue " Vol 15, No 1 (2010)" : 7 Documents clear
Efektivitas Asam Glutamat Sebagai Inhibitor Korosi pada Baja Karbon dalam Larutan NaCl 1% Ni Ketut Ketis; Deana Wahyuningrum; Sadijah Achmad; Bunbun Bundjali
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Corrosion towards the inner parts of oilfield pipelines is one of most disturbing problems in oil and gas industries.  Amino acid and its derivatives have potent as corrosion inhibitor, including glutamic acid, which has been studied within this research project.  The effectivity of glutamic acid as corrosion inhibitor towards carbon steel in 1% (w/v) NaCl solution saturated by CO2 has been determined utilizing Tafel method with the optimization of glutamic acid concentration, pH, and temperature of tested medium.  Glutamic acid showed the highest corrosion inhibition efficiency at room temperature (26oC), which is 48.19% at the concentration of 8 ppm in 1% NaCl solution and pH 6.5.  The presence of acetate buffer solution in the medium that was being tested and at the temperature higher than room temperature has caused glutamic acid at the concentration of 8 ppm became ineffective to be applied as corrosion inhibitor.
Eksistensi Interpolan Deret Ganda Sinusoida Endang Rusyaman; Hendra Gunawan; Asep Kuswandi Supriatna; Rustam Effendy Siregar
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

This paper presents a sufficient condition for the existence of a sinusoidal double series interpolant, that is the function of the form a double Fourier sine series that passes some arbitrary points  (xi, yj, cij), with 0 < xi < 1, dan 0 < yj < 1. The proof is carried out by decomposing the matrix that contains two variables into the multiplication of two matrices each of which contains one variable only, and showing that both matrices are nonsingular.
Search for New Astronomical Site in Indonesia: II. Transparency of Tropical Atmosphere Taufiq Hidayat; Putra Mahasena; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

We present a theoretical model of atmospheric transparencies for tropical region of Indonesia in the framework of developing multi-wavelength astronomical observations. The wavelengths of interest are radio, infrared, and optical domains. Beside science objectives, sky transparencies are needed to determine the corresponding wavelength band to be optimized in the observatory design. A clear sky condition is then assumed in the model and a line-by-line radiative transfer code is used at high spectral resolution.  The results, combined with study on meteorological satellite data, are utilized to provide various information to select the best possible sites for a new astronomical observatory in Indonesia. 
Search for New Astronomical Site in Indonesia : I. Global Atmospheric Parameters Taufiq Hidayat; Putra Mahasena; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

We present initial studies to search for the best possible sites for an astronomical observatory in Indonesia. Since the country occupies a vast geographical area, in so doing, we analyzed a number of basic atmospheric parameters based on GMS-NOAA meteorological satellite data at a low spatial resolution to identify some interesting feasible locations. The selected parameters are outgoing long wave radiation, temperature, precipitation, relative humidity, precipitable water, and wind profile, mostly available for a period of several decades. The data are averaged over 30 years to obtain a monthly average profile of Indonesian meteorological situation. The results suggest that regions of Nusa Tenggara Timur could offer promising sites and is merit to be explored further. 
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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Abstract

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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Abstract

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.

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