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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 339 Documents
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Fabrication and Characterization of Metal-Semiconductor-Metal n-GaN UV Photodetector by PA-MOCVD Dadi Rusdiana; Sugianto Sugianto; Andi Suhandi; Sukirno Sukirno; Maman Budiman; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 1 (2005)
Publisher : Institut Teknologi Bandung

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Metal-semiconductor-metal ultraviolet photodetectors fabricated on GaN epitaxial layers grown on (0001) sapphire by plasma-assisted metal organic chemical vapor deposition (PA-MOCVD) method. The photodetector with a thin GaN layer of 0.7 µm exhibited a low dark current with a saturation value of 1.469 x 10-14 A. The responsivity was 0.56 A/W at a wavelength of 320 nm under a bias voltage of 2.5 V.
Efek Magnetisasi Spontan dan Karakteristik Transport Listrik Film Tipis TiO2:Co yang ditumbuhkan dengan Metode MOCVD Horasdia Saragih; Pepen Arifin; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 1 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

TiO2:Co thin films were grown on Si(100) substrate by MOCVD method. The Co content in the film was varied in the range of 0.73% to 12.19%. The spontaneous magnetization effect and the electrical transport of films were measured by means of a Hall effect measurement. The Hall resistivity as a function of the magnetic field data show that the spontaneous magnetization effect occurs in films at the field lower than 1500 Oe. The Hall resistivity increases with the increase of Co concentration. The measurement of resistivity as function of temperature shows that the films have semiconductive properties. The minimum resistivity increases with increasing Co.
Optimasi Parameter Tekanan Deposisi pada Penumbuhan Lapisan Tipis Polykristal Silikon dengan Metode Hot Wire Cell PECVD Amiruddin Supu; Ida Usman; Mursal Mursal; Toto Winata; Sukirno Sukirno
Jurnal Matematika & Sains Vol 10, No 1 (2005)
Publisher : Institut Teknologi Bandung

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The Hot wire Cell PECVD method has been developed to grow the poly-Si thin films. The poly-Si thin films were grown on the 7059 corning glass at a filament temperature of 1800 oC. Silane (SiH4) gas 10% diluted in hydrogen (H2) gas was used as gas source. In the hot wire cell PECVD method, reactant gases were decomposed as a result of reaction with a heated filament placed above the substrate and paralel to the gas inlet. The characterization results exhibited that the poly-Si thin films could be grown at the pressure of 200 to 500 mTorr with a substrate temperature of 275 oC. The analysis of XRD result showed that preferential intensity was obtained at the crystal orientation of . The highest values of peak intensity (111 cps), grains size (minor axis 0.5 µm) and dark conductivity (0.60x10-5 Scm-1) were obtained at the deposition pressure of 300 mTorr with deposition rate of 2.2 nm/s.
Purifikasi Protein Fusi MBP-Mga Streptococcus pyogenes Hasil Ekspresi Heterolog di Escherichia coli Muhaimin Muhaimin; Oei Ban Liang; Enny Ratnaningsih; Endang Purwantini; Debbie Sofie Retnoningrum
Jurnal Matematika & Sains Vol 10, No 1 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Optimization of purification process of Streptococcus pyogenes’s MBP-Mga fusion protein from Escherichia coli pMALMga carrying mga49 gene had been carried out. The purification was conducted by using affinity chromatography column with amylose ligands. SDS-PAGE analysis gave a band at 104 kDa showing a pure MBP-Mga fusion protein.
Kajian Keberagaman Genetik Nyamuk Anopheles barbirostris dan A. vagus di dua Daerah Endemik Penyakit Malaria di Jawa Barat R. Ameria Sumatri; Djoko T. Iskandar
Jurnal Matematika & Sains Vol 10, No 2 (2005)
Publisher : Institut Teknologi Bandung

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Genetic diversity of two mosquitoes species in two malaria endemic areas, Tasikmalaya and Pelabuhan Ratu, has been studied using isozyme techniques on cellulose acetate gels. Fifteen enzyme systems have been analyzed for this study, performed on 46 specimens of Anopheles vagus and 44 specimens of A. barbirostris, each representing both study areas. Polymorphism in A. vagus was lower (P= 0.20-0.27) compared to A. barbirostris (P= 0.40-0.47) and the heterozigosity level of A. vagus (H = 0.027-0.031) was equally lower compared to A. barbirostris (H= 0.083-0.100) in both populations. Numerous diagnostic alleles representing each populations and species were found, but each of them only occurred at very low frequencies. These results clearly showed that the two areas were distinct entities and not as part of two related meta-populations. Unfortunately such results have a very low applicable advantage to study the population genetics of the two species or populations. One gene, Pgm owns a number of diagnostic alleles characteristics for each population at a relatively high frequencies, but its advantages are negligible, because their frequencies do not follow the Hardy-Weinberg equation, This phenomenon could be explained by: (1) unequal gene frequencies between sexes caused by gender; (2) hidden species or (3) low number of analyzed individuals and (4) artifact of electrophoresis techniques. The Tasikmalaya populations for the two distinct species had a lower genetic diversity compared to Pelabuhan Ratu populations. These results were interpreted as follows: Tasikmalaya populations suffered from human activities and had more or less uniform habitats or in the other hand, Pelabuhan Ratu populations were much larger than those from Tasikmalaya. The results of Pelabuhan Ratu were more variable as a logical consequence of having a more extensive population with more Anopheles species as the area included forested and garden or plantation areas but less rice-fields and had likely undergone lesser exposure to human activities.
Uji Daya Lekat Mukoadhesif secara In Vitro beberapa Eksipien Polimer Tunggal dan Kombinasinya pada Lambung dan Usus Tikus Teti Indrawati; Goeswin Agoes; Elin Yulinah; Yeyet Cahyati Sumirtapura
Jurnal Matematika & Sains Vol 10, No 2 (2005)
Publisher : Institut Teknologi Bandung

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Mucoadhesive strength test of some polymer excipients is importance for development of oral sustain release with mucoadhesive system to enchance bioavailability. Mucoadhesive strength of granules that prepared using single and combination of polymers i.e. from carboxymethylcellulose, gum arabic, and sodium alginate with Metolose 90SH-15.000 (Metolose K-15) and Metolose 90SH-100.000 (Metolose K-100) on rat stomach and intestinal had been determined by bioadhesion and wash off test. Results showed that single polymer and its combination could adhesive to rat stomach and intestine in 5 minuter. The granul prepared using Metolose K-15 and sodium alginat in single and combination form gave the strongest adhesive strength to stomach, while Metolose K-15 and gum arabic in a single form showed the strongest adhesive to intestine. The strongest adhesion to stomach and intestine was the granule combination of sodium alginat and Metolose K-15 (20 : 40) with the amount of granule adhesived to stomach and intestine was 100 % and 88 % respectively.
Study of Pseudostate Expansion in a Simplified Model of Elastic Electron Scattering from Helium Agus Kartono; Toto Winata
Jurnal Matematika & Sains Vol 10, No 2 (2005)
Publisher : Institut Teknologi Bandung

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In this paper, we present a simplified model of electron-helium scattering in which all terms involving nonzero orbital angular momentum are neglected. Elastic scattering cross sections are calculated for this model by using the close-coupling expansion with a non-orthogonal Laguerre-L2 basis function. It is found that the results are in good agreement with experiments and with the other theoretical results.
GaN-based Double-hetero Film Grown and Fabricated on (0001) Sapphire Substrates by Plasma-assisted MOCVD Heri Sutanto; Edi Supriyanto; Maman Budiman; Pepen Arifin; Sukirno Sukirno; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 2 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

GaN-based double-hetero film has been grown on (0001) sapphire substrate by plasma-assisted MOCVD method. The structure of film was n-GaN/Al0.25Ga0.75N/In0.3Ga0.7N/Al0.25Ga0.75N/p-GaN. A photoluminescence (PL) peak originating from InGaN active layer has been observed at room temperature, which produced emission wavelength of 453 nm corresponded to energy of 2.74 eV. However, broadening of the peak caused by the crystalline quality of the InGaN epilayer is still poor, which is related with fluctuation of In rich regions.
Analisis Sifat-sifat Optoelektronik Lapisan Tipis Silikon Amorf terhidrogenasi yang ditumbuhkan dengan Teknik VHF-PECVD pada Variasi Daya RF Ida Usman; Amiruddin Supu; Mursal Mursal; Sukirno Sukirno; Toto Winata; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 2 (2005)
Publisher : Institut Teknologi Bandung

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The hydrogenated amorphous silicon (a-Si:H) thin films have been deposited using VHF-PECVD technique. The deposition process was done by varied the rf power from 6 to 12.5 watts with 300 mTorr of chamber pressure and from 20 to 70 watts with 100 mTorr of chamber pressure. The highest deposition rate of 2.99 Å/sec and the highest photoconductivity of 1.13 x 10-4 S/cm were obtained from 8 watts of rf power when the rf power was varied from 6 to 12.5 watts. Then, the highest deposition rate of 9.57 Å/sec was obtained from 40 watts of rf power and the highest photoconductivity of 1.54 x 10-2 S/cm was obtained from 20 watts of rf power when the rf power was varied from 20 to 70 watts. Based on the analysis of characterization results, the degradation of a-Si:H film conductivity was caused by the formation of defect states such as band-tail defect and bandgap defect.
Silikat dan Titanium Silikat Mesopori-Mesotruktur Berbasis Struktur Heksagonal dan Kubik Hari Sutrisno; Retno Arianingrum; Ariswan Ariswan
Jurnal Matematika & Sains Vol 10, No 2 (2005)
Publisher : Institut Teknologi Bandung

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Silicalite (MCM-41 & MCM-48) and titanium silicalite (Ti-MCM-41 & Ti-MCM-48) mesoporous-mesostucture material have been synthesized and studied. Its have been obtained from hydrolysis and condensation of reactant : tetraethyl orthosilicate (TEOS) as silicium source and cetyltrimethyl ammonium bromide (CTAB) surfactant as template, NaOH as base and water solution. Ti-MCM-41 & Ti-MCM-48 mesoporous-mesostucture material have been synthesized from crystal of [Ti8O12(H2O)24]Cl8.HCl.7H2O as titanium source. Surfactant was removed by calcinations at 5500C for 5 hours. MCM-41 and Ti-MCM-41 are crystallized on the hexagonal structure, plane group p6 with unit cell parameter: a = 44.09 and 49.48 Ǻ respectively, meanwhile MCM-48 and Ti-MCM-48 are crystallized on the cubic structure, space group Ia3d with unit cell parameter: a = 87.46 and 94.42 Ǻ respectively.

Page 8 of 34 | Total Record : 339

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