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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 5 Documents
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Search results for , issue " Vol 12, No 4 (2007)" : 5 Documents clear
Fractional Integral Operators and Their Boundedness on Various Spaces Hendra Gunawan; Idha Sihwaningrum
Jurnal Matematika & Sains Vol 12, No 4 (2007)
Publisher : Institut Teknologi Bandung

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Abstract

This is a survey paper which presents and discusses some results on fractional integral operators and their generalizedversion on both homogeneous and non-homogeneous spaces.
The Motion of Solar Wind Charged Particle in a Sinusoidal Vibrating Magnetic Field Iratius Radiman
Jurnal Matematika & Sains Vol 12, No 4 (2007)
Publisher : Institut Teknologi Bandung

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Abstract

The motion of solar wind charged particle in a small perturbed magnetic field lines of magnitude B1 is derived througha perturbed Lorentz force. By introducing a small sinusoidal velocity perturbation v1 in transverse direction to theoriginal velocity field vo, a small perturbed magnetic field is resulted from the original magnetic field of magnitude B0. Asystem of simultaneous differential equations describing the perturbed Lorentz force in Cartesian coordinates isobtained. These equations, denoted as RESY, are then treated numerically to follow qualitatively the behaviour of thecharge motion locally. The squared space velocity resulted from RESY are twice to three times larger than the initialvelocity squared in the case of constant magnetic field. Here the initial velocity was normalized to unity,whereas itsvalue may be estimated from the well-known Parker exponentially increased solar-wind velocity. Vibrating magneticfields might be one candidate to explain the observed very high velocities for some solar wind particles.
Pengaruh Bentuk dan Fluktuasi Ukuran Dot terhadap Pelebaran Garis Spektral Inhomogen pada Quantum Dot Gallium Nitrida (QD GaN) Fitri Suryani Arsyad; Budi Mulyanti; Amiruddin Supu; Moehamad Barmawi
Jurnal Matematika & Sains Vol 12, No 4 (2007)
Publisher : Institut Teknologi Bandung

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Abstract

Theoretical analysis of the phenomena of the size fluctuation in Gallium Nitride quantum dot (GaN QD) is presented inthis paper. The effect of QD size fluctuation on the electron and hole energy level and the inhomogeneous linebroadening is studied. Analytical expressions for the inhomogeneous line broadening are derived for a Gaussian sizefluctuation distribution. Decreasing in the QD carrier energy level is observed when QD size increases. The peak ofoptical transition energy probability (Emax) is shifted to higher energy when dot size fluctuation (σL) increases. Theoptical transition energy distribution (fE) of cylindrical QD is at the higher energy with the inhomogeneous linebroadening (σE) wider than those of conical, ellipsoidal, as well as semi ellipsoidal QD.
Spesiasi Senyawa Organotimah dengan Teknik Kromatografi Pasangan Ion-Fasa Terbalik Aman Sentosa Panggabean; Muhammad Bachri Amran; Buchari Buchari; Sadijah Achmad
Jurnal Matematika & Sains Vol 12, No 4 (2007)
Publisher : Institut Teknologi Bandung

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Abstract

The application of Ion Pair-Reversed Phase chromatography (IP-RP) technique for speciation of dibutyltin (DBT),tributyltin (TBT) and triphenyltin (TPhT) species has been studied. All of the species were able to separate on an ionpair-reversed phase chromatographic column. The eluats were detected online by the use of Hydride Generation-QuartzFurnace Atomic Absorption Spectrophotometry (HG-QFAAS) method. The eluent consisted of a mixture of methanol :water : acetic acid with a composition of 80:19:1, containing 1 mM of decane sulfonate as ion pairing reagent. The pHof the eluent was adjusted with 1 M H2SO4. The separation of all the species at the above conditions was good, whichwas shown by the values of the fundamental chromatographic parameters. The capacity factor (k) for DBT, TBT andTPhT species were 0.27, 2.54 and 5.92 respectively. The resolution (Rs) values for DBT-TBT and TBT-TPhT separationwere 2.92 and 2.42 respectively, while the selectivity for DBT-TBT and TBT-TPhT were 9.76 and 3.50, respectively.These data show the effectiveness of the developed chromatographic system.
Antibacterial Activity of Marine Bacteria Associated with sponge Aaptos sp. against Multi Drugs Resistant (MDR) strains Ocky Karna Radjasa; Duhita Sinidhikaraning Kencana; Agus Sabdono; Rory Anthony Hutagalung; Endang Sri Lestari
Jurnal Matematika & Sains Vol 12, No 4 (2007)
Publisher : Institut Teknologi Bandung

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The improper and uncontrolled uses of antibiotics against pathogenic bacteria have resulted in the occurrence of MultiDrugs Resistant (MDR) strains. There is now an urgency to find alternative antibiotics to combat the MDR strains.Sponge associated microorganisms are among the most interesting and promising marine natural product sources whichproduce polyketide and non ribosomal peptide products with various biological activities. In this study, marine bacteriawere isolated from sponge Aaptos sp. collected from North Java Sea, and were screened for antibacterial activityagainst MDR strains. Three out of 64 bacterial isolates were successfully screened and were found to be active againstMDR strains, in which two isolates (SPA1 and SPA5) were active against resistant strain Escherichia coli and one isolate(SPA21) against resistant strain Proteus sp., respectively. These active isolates were also capable of amplifying NRPS(Non Ribosomal Peptide Synthetases) gene fragments necessary for the biosynthesis of non ribosomal peptides. Themolecular identification based on partial 16S DNA nukleotide sequences indicates that the active isolates areHalomonas aquamarina, Alpha proteobacterium, and Pseudoalteromonas luteviolacea.

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