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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 2, No 2 (1997)" : 5 Documents clear
Profil Farmakokinetik dan Ketersediaan Hayati Tiga Sediaan Tablet Natrium Diklofenak Salut Enterik Yeyet Cahyati Sumirtapura; Herwanto Suhalim; Weda Wibawati
Jurnal Matematika & Sains Vol 2, No 2 (1997)
Publisher : Institut Teknologi Bandung

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Abstract

Pharmacokinetic and bioavailability studies of three enteric coated 50-mg sodium diclofenac tablets marketed in Indonesia (DR-50, FR-50 and VN-50) have been carried out in six healthy Indonesian volunteers with three-way crossover design. The results obtained showed that there were significant differences in the bioavailability parameters of the three products tested. The lag-time observed varied from 1 to 2 hours for DR-50, 0.5 to 2 hours for FR-50, and 1.5-2 hours for VN-50. Peak plasma levels of 1.16 + 0.59, 2.06 + 1.03, and 0.68 + 0.3 μg/ml were reached in 3.3 + 1.4, 1.9 + 0.9, and 3.8 + 1.2 hours following administration of DR-50, FR-50 and VN-50, respectively. The area under the curve given by each product were 3.81 + 1.60 μg/ml.hr for DR-50, 3.87 + 0.89 μg/ml.hr.for FR-50, and 3.13 + 1.33 μg/ml.hr for VN-50. The elimination half life of diclofenac observed varied from 2.1 to 6.9 hours with a mean value of 3.7 + 1.5 hours.
Antimicrobial Activities of the Ethanol Extracts of Capsicum Fruits with Different Levels of Pungency Soediro Soetarno; Sukrasno Sukrasno; Elin Yulinah; Sylvia Sylvia
Jurnal Matematika & Sains Vol 2, No 2 (1997)
Publisher : Institut Teknologi Bandung

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Abstract

Ethanol extracts of the fruits of three kinds of Capsicum showed similar potencies in their antimicrobial activities against Gram (+) and Gram (-) bacterias, and fungi, although they contained different level of capsaicin. Bioautographic tests demonstrated that capsaicin was the main antimicrobial component. At least two other non-polar components of ethanol extract also contributed in the antimicrobial activity and very likely that these compounds were responsible for the activity toward Pseudomonas aeruginosa.
Colloid Chemical Rheology of Non-Aqueous Advanced Electroceramic Slips Bambang Ari Wahjudi
Jurnal Matematika & Sains Vol 2, No 2 (1997)
Publisher : Institut Teknologi Bandung

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Abstract

In many, if not all ceramic industries it is becoming increasingly important to be able to understand and quantify processing behaviour of materials such that final product performance can be accurately determined. In the present work, the usefullness of the so called Stress-Controlled Rheometer in characterising the rheological properties of alumina slips is demonstrated. The alumina slips investigated exhibit more Newtonian character with predominating viscous component at low frequencies, on the other hand shifted to about 22% viscoelastic character at higher oscillating frequencies. Rheological behaviour reflects the extent of interparticulate interaction in a manner that polymer chains conformation is responsible for either the observed elastic nature or dissipative viscous character of flow. Further, it is also revealed that viscoelasticity in a ceramic slip is determined largely by the extent of polymer barrier interpenetration in the overlapped region.
Mechanistic Studies on Photoacylation Megawati Santoso
Jurnal Matematika & Sains Vol 2, No 2 (1997)
Publisher : Institut Teknologi Bandung

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Abstract

An unprecedented photoacylation method for preparation of acyl- and aroyliron(III) porphyrin complexes has been reported1). This paper present the mechanistic studies on such photoacylation. Detailed mechanistic studies on the photoacylation of chloroiron(III) tetraphenylporphyrin ((TPP)FeCl) suggest "controlled" radical reactions. In the presence of UV light (TPP)FeCl undergoes intramolecular electron transfer to yield (TPP)Fe(II) and chlorine radical. Aldehyde prevents the back electron transfer by trapping the chlorine radical to form the corresponding acyl radical. The photoreduced (TPP)Fe(II) then undergoes oxidative addition with the acyl radical to yield the corresponding acyliron(III) tetraphenylporphyrin complex.
Dinamika Gelombang Cnoidal di Atas Dasar Tak Rata Menggunakan Persamaan Gelombang Dua Arah Boussinesq Warsoma Djohan
Jurnal Matematika & Sains Vol 2, No 2 (1997)
Publisher : Institut Teknologi Bandung

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Abstract

Waves over uneven bottom which are running in two directions are governed by Boussinesq equations. When the bottom is flat, the Boussinesq equations have a periodic travelling wave solution, i.e. a solution which is running undisturbed in shape and velocity. This travelling wave is called a cnoidal wave. In this research the distortion of a cnoidal wave due to decreasing depth will be studied numerically. A cnoidal wave is initially running above flat bottom, then the depth decreases and flat again with depth h1 (< h0). First, a cnoidal wave is constructed as solution of the constrained critical point problem, i.e. finding the extremism of energy with constraints momentum and mass. Then the Boussinesq equations are discritized using the direct Fourier truncation method. Numerical simulation shows that the cnoidal wave constructed above is indeed a travelling wave solution. By choosing h1 to be the eigendepth of the two-soliton solution of KdV according to the inverse scattering theory, numerical simulations show the splitting process of an initial cnoidal wave into two waves.

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