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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 5 Documents
 1 
Search results for , issue " Vol 13, No 4 (2008)" : 5 Documents clear
Optimasi Parameter Tekanan Deposisi untuk Penumbuhan Lapisan Tipis Mikrokristal Silikon dengan Metode HWC PECVD Amiruddin Supu; I Wayan Sukarjita; Fakhruddin Fakhruddin; Fitri Suryani Arsyad; Toto Winata; Sukirno Sukirno
Jurnal Matematika & Sains Vol 13, No 4 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The Hot Wire Cell PECVD method has been developed and successfully applied to grow the hydrogenated microcrystalline silicon ( µc-Si:H) thin films. The µc-Si:H thin films were grown on the 7059 corning glass at a filament temperature of 1000 oC. Ten percents silane (SiH4) gas diluted in hydrogen (H2) gas was used as gas source. In the hot wire cell PECVD method, reactant gases are decomposed as a result of reaction with a heated filament. The filament was placed parallelly with inlet gas system and outside of electrodes. The characterization results exhibited that the deposition rate increased from 1,45 Å/s to 1,56 Å/s with increasing the deposition pressure from 700 mTorr to 1100 mTorr. The SEM image and the XRD spectrum exhibited the transition of amorphous to microcrystalline silicon at an deposition pressure of 1000 mTorr. The transition of amorphous to microcrystalline was indicated by the reduction of amorphous parts and the appearance of peak diffraction at preferential crystal orientation. The dark and photo conductivities of the obtained µc-Si:H thin films was 1,2 x10-5 S cm-1 and 2,12 x 10-3 S cm-1, respectively.
Pengaruh Ketebalan Lapisan Aktif terhadap Karakteristik Sel Surya Berbasis a-Si:H yang Ditumbuhkan dengan Teknik HWC-VHF-PECVD Ida Usman; Toto Winata
Jurnal Matematika & Sains Vol 13, No 4 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The HWC-VHF-PECVD (Hot Wire Cell Very High Frequency Plasma Enhanced Chemical Vapor Deposition) technique has been developed for silicon thin film deposition. The developed technique was also used to fabricate the hydrogenated amorphous silicon (a-Si:H) based p-i-n solar cells with varied active layer (i-layer) thickness. Based on the measurement result of current-voltage (I-V) characteristic of resulted solar cells, it is known that the conversion efficiencies are influenced by the i-layer thickness of each solar cell. In this research, the highest conversion efficiency of 9,39 % was achieved from solar cell with i-layer of 5500 Å thickness. All of solar cell parameters decrease as the ilayer thickness increases to 6000 Å, which were probably affected by the serial resistance increases that marked by the degradation of fill factor value.
Struktur Modul Hasil Bagi dari Modul Dedekind Hanni Garminia; Pudji Astuti; Irawati Irawati
Jurnal Matematika & Sains Vol 13, No 4 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

It is well known that the quotient ring of a Dedekind prime ring is a Dedekind prime ring. In this article we generalize the property of Dedekind ring to a module over a commutative ring. Particularly we show that the quotient module of a Dedekind module is a Dedekind module.
Spektrum Gstar(1;1) Nunung Nurhayati; Udjianna Sekteria Pasaribu; Dudung Muhally Hakim; Oki Neswan
Jurnal Matematika & Sains Vol 13, No 4 (2008)
Publisher : Institut Teknologi Bandung

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In this paper we formulate the spectrum (spectral density matrix) of the stationary GSTAR(1;1) model by considering the model as VMA( ∞). The spectrum can be obtained by following steps: represent the model as an VMA( ∞) and convert the model to the backward operator form, then substitute the coefficient model to the spectrum of VMA( ∞) model. The procedure of finding spectrum of GSTAR(1;1) which parameters are given, is illustrated by a two dimensional GSTAR(1;1) model.
Estimating Hyperbolic Decline Curves Parameters Sri Wahyuningsih; Sutawanir Darwis; Agus Yodi Gunawan; Kurni Permadi
Jurnal Matematika & Sains Vol 13, No 4 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The decline curve analysis refers to the estimation of some measure of well performance. The linearization of Arps hyperbolic decline curves leads to the estimation of initial value of decline exponent. This work proposes a graphical method to estimate the initial value of decline exponent and a binomial expansion to estimate the decline rate and the initial production value. The graphical approach is used to determine the initial value of the decline exponent for binomial expansion of hyperbolic Arps equations. Experimental study from some small data sets shows that our proposed method is capable in reducing the number of iterations needed in binomial linearization of hyperbolic decline curves. The main contribution of this work is a development of initial decline exponent estimation using graphical approach where the traditional approach is based on trial and error. Bias in estimating the initial values can produce large number of iterations in estimating the decline exponent. The proposed method is successfully reduce the number of iterations in estimating the decline exponent. Experimentally, this study indicates the existence of lower bound of decline exponent b* for each iteration using hyperbolic binomial expansion.  

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