cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota bandung,
Jawa barat
INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue " Vol 14, No 1 (2009)" : 5 Documents clear
Pengaruh Kepadatan Awal Inokulum terhadap Kualitas Kultur Chaetoceros gracilis (Schütt) pada Sistem Batch Gede Suantika; Pingkan Adityawati; Dea Indriani Astuti; Yusup Sofyan
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Chaetoceros gracilis (Schütt) is a common live food used in white shrimp Litopenaeus vanamei larviculture that is commonly produced by using batch culture system. The aim of this study was to evaluate the effect of different initial densities inoculums to obtain the optimum quality of C. gracilis culture in batch culture system. Based on the result from step 1, the highest cell density of 9,85x106 ± 5,00x105 cells/mL was obtained in the culture with inoculum initial density of 1,0x105 cells/mL. At step 2, the highest cell density of 9,87 x 106 ± 2,00 x 105 cells/mL was obtained in the culture with inoculum initial density of 1,0x105 cells/mL and it was significantly (p
Penumbuhan Lapisan Tipis mc-Si:H Tipe-P dengan Metode HW-PECVD untuk Aplikasi Sel Surya Jasruddin Daud Malago; Abdul Haris; Helmi Helmi
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Thin film of microcrystal silicon hydrogenated (μC-Si:H) p-type has been successfully grown in a hot-wire plasma enhanced chemical vapor deposition (HW-PECVD) by using silane gas (SiH4) and diborane (B2H6) diluted in 10% H2 respectively as gas resources. The resulted thin film have optical band gap decreased from 1.88 eV to 1.50 eV as the dopant concentration increased from 0.50% to 0.20% on filament voltage of 4.5 volt and RF power of 100 watt. Dark and photo conductivities of the film were found significantly high, in the order of 10-8-10-6 Scm-1 and 10-5-10-3 Scm-1 respectively. The conductivity is two order higher than thin film a-Si:H p-type grown using PECVD technique without hot-wire. It is concluded that the thin film produced in this study is suitable for solar cell application and other microelectronic devices
Gelation Model for Porosity Dependent Fluid Permeability in Porous Materials Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A statistical theory of gel formation in a polymer matrix was used to explain the dependence of liquid permeability in porous materials. A porous material was modeled as a dispersion of bubbles in a solid matrix. Bubbles were treated as monomers and formation of infinite connected bubbles was treated as the formation of gels in polymer. The theoretical predictions were in agreement with the observed data for basalt andesits. The model can easily predict the percolation threshold of porosity at which the permeability increases suddenly, which depends on the effective number of nearest bubbles around a selected bubble. Around the percolation threshold, the permeability satisfies a scaling relationship with a critical exponent of t » 1.2. It is also identified that the critical exponent and fractal dimension of pores, D, satisfy t » 0.8 (1 + 1/D).
Pengaruh Komposisi Asam Bis(2-Etilheksil)Fosfat (D2EHPA) dan Tributil Fosfat (TBP) dalam Resin Amberlite Xad-16 terhadap Sorpsion-Ion La(III), Nd(III) dan Gd(III) Ibnu Khaldun; Buchari Buchari; Muhammad Bachri Amran; Aminudin Sulaeman
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sorption of La(III), Nd(III), and Gd(III) ions with solven-timpregnated resins using bis(2-ethylhexyl)phosphoric acid (D2EHPA) and tributhylphosphate (TBP) as extractants and Amberlite XAD-16 as a polymeric support has been studied. The impregnated resins containing various amounts of extractants have been prepared by the wet and dry methods. The effects of pH, types, of extractant, extractant content (extractants/resin ratios of 10/90, 20/80, 50/50, 60/40 wt.%) and contact time on sorption of those metalic ions have been investigated by batch method. The sorption capacity of Amberlite XAD-16 resin previously prepared by the wet method with a 60/40 extractant/resin mass ratio for TBP, D2EHPA/TBP, and D2EHPA were 104.3 mg/g, 99.1 mg/g and 86.2 mg/g resin, respectively. Meanwhile, sorption capacity of Amberlite XAD-16 resin previously prepared by dry method was found to be 645 mg/g; 419.16 mg/g, and 386.9 mg/g resin, respectively. The sorption percentage of the studied metal ions was within the range of 90- 99% for TBP, D2EHPA/TBP and D2EHPA XAD-16 resins at 20/80 extractant/resin mass ratio.
Sintesis Turunan Eusiderin A dan Evaluasi Aktifitas Antimakan terhadap Hama Tanaman, Epilachna sparsa Syamsurizal Syamsurizal; Afrida Afrida
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Eusiderin A(1) which isolated from bulian wood (Eusideroxylon zwagery) was converted into five congeners (2- 6) which designed on account of the clogP smaller than 1. The structures of these five compounds were determined based on their spectroscopic data including 1H- NMR, 1H-1H-COSY, and NOESY spectra and mass spectra. The antifeedant activity and the brine shrimp lethality test against Artemia salina were evaluated to demostrate that 2, 3 and 6 increased significantly the antifeedant activity than eusiderin A, while the compounds(2-6) were classified as non toxic.

Page 1 of 1 | Total Record : 5

 1 

Filter by Year

2009 2009


Reset
Filter By Issues
All Issue Vol 22 No 1 (2017) Vol 21 No 1 (2016) Vol 20 No 1 (2015) Vol 19 No 3 (2014) Vol 19 No 2 (2014) Vol 19 No 1 (2014) Vol 18 No 3 (2013) Vol 18 No 2 (2013) Vol 18, No 1 (2013) Vol 17, No 3 (2012) Vol 17, No 2 (2012) Vol 17, No 1 (2012) Vol 16, No 3 (2011) Vol 16, No 2 (2011) Vol 16, No 1 (2011) Vol 15, No 3 (2010) Vol 15, No 2 (2010) Vol 15, No 1 (2010) Vol 14, No 4 (2009) Vol 14, No 3 (2009) Vol 14, No 2 (2009) Vol 14, No 1 (2009) Vol 13, No 4 (2008) Vol 13, No 3 (2008) Vol 13, No 2 (2008) Vol 13, No 1 (2008) Vol 12, No 4 (2007) Vol 12, No 3 (2007) Vol 12, No 2 (2007) Vol 12, No 1 (2007) Vol 11, No 4 (2006) Vol 11, No 3 (2006) Vol 11, No 2 (2006) Vol 11, No 1 (2006) Vol 10, No 4 (2005) Vol 10, No 3 (2005) Vol 10, No 2 (2005) Vol 10, No 1 (2005) Vol 9, No 4 (2004) Vol 9, No 3 (2004) Vol 9, No 2 (2004) Vol 9, No 1 (2004) Vol 8, No 4 (2003) Vol 8, No 3 (2003) Vol 8, No 2 (2003) Vol 8, No 1 (2003) Vol 7, No 2 (2002) Vol 7, No 1 (2002) Vol 6, No 2 (2001) Vol 6, No 1 (2001) Vol 5, No 2 (2000) Vol 5, No 1 (2000) Vol 4, No 2 (1999) Vol 4, No 1 (1999) Vol 3, No 2 (1998) Vol 3, No 1 (1998) Vol 2, No 2 (1997) Vol 2, No 1 (1997) Vol 1, No 2 (1996) Vol 1, No 1 (1996) More Issue