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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue " Vol 10, No 3 (2005)" : 6 Documents clear
Estimasi Daya Dukung dan Pola Pertumbuhan Populasi Keong Lola (Trochus niloticus) di Pulau Saparua, Kabupaten Maluku Tengah Handy Erwin Pier Leimena; Tati Suryati Subahar; Adianto Adianto
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

This study was conducted to estimate the carrying capacity and population growth pattern of lola snail (Trochus niloticus) in Saparua Island. Samples were collected by strip transect method which was 100 meter long and 2 meter wide and were laid perpendicular to the coast line starting from the lowest tide level. Data were analyzed by Bhattacharya method to determine the age classes each individuals. The results showed that the population density was 620 individual/ha and the net reproductive rate of lola was 226 individuals and generation time was 2.88 years. Based on these this results, the carrying capacity which is the theoritical maximum density of lola snail population can be estimated to be 27.779 individuals per hectare and its population growth can be described by equation Nt = 27,779/e4.232-.,884. On the other hand the optimum population growth would be obtained when the population density equalled to 13.890 individuals in 2.25 years.  
ℤ6-II Orbifold Model of the Heterotic String Freddy Permana Zen; Bobby Eka Gunara; Asep Yoyo Wardaya
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

We study a ℤ6-II orbifold model which is derived from the ten-dimensional SO(16) × SO(16) heterotic string theory whose the extra six dimensional space is devided by the ℤ6-II rotations. All independent embeddings are classified using both shifting and rotation procedures of an SO(16) × SO(16) root lattice. SO(10) × SU(3) × U(1) × SO(16) models are elucidated as examples among the models.
Sifat Listrik Film Tipis SrTiO3 untuk Kapasitor MOS Darsikin Darsikin; Khairurrijal Khairurrijal; Sukirno Sukirno; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Strontium titanate (SrTiO3) film was successfully deposited on a silicon substrate by using a pulsed-laser ablation deposition (PLAD) technique. The optimum temperature is 600o C. The electrical properties measurement was metal-oxide-semiconductor capacitor. The film exhibits good insulating property at room temperature. The fixed charge density and leakage current density were also calculated. The results show that the films have promising applications as alternative gate dielectrics.
Penumbuhan Lapisan Tipis µc-Si:H dengan Sistem Hot Wire PECVD untuk Aplikasi Divais Sel Surya Syamsu Syamsu; Darsikin Darsikin; Iqbal Iqbal; Jusman Jusman; Toto Winata; Sukirno Sukirno; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Microcrystalline hydrogenated silicon thin films have been grown on corning 7059 by using Hot Wire Plasma Enhanced Chemical Vapor Deposition (PECVD) system. Silane gas dilute in hydrogen gas (SiH4: H2 = 1 : 10 ) used as gas source. The effect substrate temperatures on deposition rate, optical, electrical and structural properties were analyzed. The deposition rate was varied from 3.22-5.24 µm/hour at temperature 175-275o C, SiH4 flow rate of 70 sccm, and filament temperature ~ 1000oC. The optical band gap varied from 1.13-1.44 eV at substrate temperature of 175-275. The Result XRD characterization of µc-Si: H thin film was grown at 275o C shows , , and orientation. Dark conductivities vary from 10-6-10-4 S/cm The Dark conductivity of µc-Si: H is higher than a-Si: H thin film. This result shows that µc-Si: H thin film is possible for p-i-n solar cells device application.  
2’,4’-Dihidroksi-3’,5’,6’-Trimetoksi Calkon suatu Senyawa Antitumor dari Kulit Batang Tumbuhan Cryptocarya costata (Lauraceae) Hanapi Usman; Euis Holisotan Hakim; Sjamsul Arifin Achmad; Tjodi Harlim; Muhammad N. Jalaluddin; Yana Maolana Syah; Lia Dewi Juliawati; Lukman Makmur; Mariko Katajima
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Sifat Listrik Film Tipis SrTiO3 untuk Kapasitor MOS An anti-tumor calcon has been isolated from Criptocarya costata stem bark. The compound was obtained from chloroform fraction fractioned by chromatography technique and recrystalized in n-hexane and ethyl acetate. The compound structure elucidated based on physical and spectroscopic data was 2,4-dihydroxy-3,5,6-trimethoxy calcon. Cytotoxic assay using murine leukemia cell P388 showed positive activity with IC50 value of 3.65 µg/mL.
In Situ Measurement of the Growth Rate of the (111) Face of Borax Single Crystal Suharso Suharso
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

The quality of borax crystals is determined by grade and specifically shaped crystals of high purity. One of fundamental studies of this quality is an investigation of the growth rate of each face of borax single crystals. This paper studies the growth rates of borax single crystals along the (111) direction at various relative supersaturations using in situ optical microscopy technique to elucidate mechanism of growth and crystal growth rate equation. The result shows that the growth mechanisms of the (111) face of borax crystal at temperature of 20°C are spiral growth mechanism below relative supersaturation of 0.49 and a birth and spread mechanism above relative supersaturation of 0.49.

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