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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
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Search results for , issue " Vol 13, No 3 (2008)" : 5 Documents clear
Pengaruh Pengasaman terhadap Fotodegradasi Klorofil a Aji Wahyu Budiyanto; Soenarto Notosudarmo; Leenawaty Limantara
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

Chlorophyll is tetrapyrole pigment, which is potential to be developed as photosensitizer agent on cancer photodynamictherapy. Its environments and properties during interaction are an important parameter to know the next fate of thesensitizer. Acidic environment is one of the key factors on cancerous patients. The research was carried out to determinethe acidification effect against photostability of chlorophyll a that was observed by its spectral pattern. Result showedthat titration of less than 250 μL acetic acid 3 M caused degradation of chlorophyll a more rapidly. Volume and type ofacid properties did not only influenced pheophytinization reaction, but also caused pheophytin a to deaggregate, thatwas characterized by hypsochromic shift of Qy band.
Synthesis of Wax Esters From Palm Kernel Oil Catalyzed by Lipase Erin Ryantin Gunawan; Dedy Suhendra
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The lipase catalyzed reaction of wax esters synthesis using palm kernel oil and long chain alcohol (oleyl alcohol) assubstrates and lipase lipozim as catalist was carried out. The effects of various reaction parameters such as reactiontime, temperature, amount of enzyme, molar ratio of substrates and various organic solvents were investigated. Theoptimum reaction condition for wax ester synthesis is a mixture of palm kernel oil and oleyl alcohol with molar ratio of(3:1), with 1.5% (w/v) lipozyme, at 40 oC for 7-10h, and with hexane as the best solvent. Percentage yields of wax estersobtained at these optimum reaction conditions was 84.4 ± 2.85 %.
Pengembangan Metode Prakonsentrasi dengan Teknik Injeksi Alir untuk Analisis Cu2+ dan Pb2+ dalam Air Aliran Sungai Citarum dan Waduk Saguling Saepudin Suwarsa; Buchari Buchari; Aman Sentosa Panggabean
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

A research aiming at developing preconcentration method using ion exchange resin column for Cu2+ and Pb2+ ionsanalysis in the stream of Citarum river and the Saguling lake has been carried out. The preconcentration method wasperformed using a mini column filled with Dowex 50W-X8. The preconcentration method was developed to beincorporated with the flow injection analysis (FIA), for which water samples were passed through the mini column andby eluting with 3 M HCl, and the eluate was detected by an atomic absorption spectrophotometer detector. The optimalconditions for the best analytical performance with FIA-AAS method were 5 mL injection volume of waters samples, theeluent HCl concentration was 3 M and the volume was 1 mL. The limit of detection achieved by this method for Cu andPb ions were 5.26 dan 24.57 ppb, respectively. The reproducibility level shown by the coefficient of variance for thismethod was 2.11%. The method was applied to natural water samples with a recovery percentage of > 95%. The spikemethod develoved in this research, for matrices of water sample from Citarum river and the Saguling lake, has itsadvantage that the matrices did not affect the results of measurements.
Pengaruh Temperatur terhadap Mekanisme Inhibisi oleh Sistein pada Korosi Baja Karbon dalam Larutan NaCl Jenuh CO2 Yayan Sunarya; Cynthia Linaya Radiman; Sadijah Achmad; Bunbun Bundjali
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The inhibition mechanism of cysteine on API 5L X65 carbon steel corrosion in CO2-saturated NaCl solution at 300K –360K was studied. The investigations involved potentiodynamic polarization, electrochemical impedance spectroscopy(EIS) methods and computer simulation of Zview program. The results showed that the inhibition mechanism takes placethrough formation of passive layers that covers carbon steel surface with inhibition efficiency up to 85%. Functionalgroup dominantly involved in the formation process of the passive layers is –SH at low temperature, and –NH3+ athigh temperature. The increasing temperature alters the carbon steel corrosion/inhibition process from kinetics ofcharge transfer to diffusion process.
Spectral Decomposition of Transition Matrix Sutawanir Darwis; Kuslan Kuslan
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The transition probabilities of a two-state Markov process can be determined explicitly. The modeling of forcetransition of two state Markov process using double decrement approach is well developed in the literature. However,the approaches are mainly analytic or illustrative and are based on small data set. The study based on large data set arerarely published. For higher number of states, the computation of transition probabilities is laborious, and analternative method is needed. This work aims to propose a spectral approach of forces of transition that attempts toaddress the issues. The method is based on results that are available when a Markov process with constant forces oftransition is assumed. In this case, transition probabilities are obtained regardless of the number of states. A differentialequation is used to express the relationship between forces of decrements and transition probabilities, and by assumingconstant force, the explicit solution is reduced to spectral decomposition of force of decrements. The results are thevisualization of transition probabilities, and a contribution for the development of double decrement table. The maincontributions of this work are a spectral representation of transition probabilities and a multistate approach to doubledecrement modeling.

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