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Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 7 Documents
 1 
Search results for , issue "Vol. 35 No. 2 (2003)" : 7 Documents clear
Analisis Dinamik Tegasan Purba pada Satuan Batuan Paleogen – Neogen di Daerah Pacitan dan Sekitarnya, Provinsi Jawa Timur Ditinjau dari Studi Sesar Minor dan Kekar Tektonik C. I. Abdullah; N. A. Magetsari; H. S. Purwanto
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.3

Abstract

There are four trends of geological structures in the region of Pacitan and its closed surrounding, as the result of the tectonic deformation which occured during the Tertiary up to Quaternary. Those trends of geological structures are classified as fault groups in the direction of NW - SE (N3100E - N3300E), N - S (N3500E - N0100E), NE - SW (N0450E - N0500E), and E - W (N0800E). The result of the paleostress reconstruction based on the minor faults and shear fractures, point to three axis direction of principle stress: First, Early Miocene Stress with the 1 direction between 150, N1640E - 090, N1700E. The respective stress caused the formation of fault in the direction of NW - SE and fold structures. Second, Middle Miocene Stress with the 1 direction between 160, N1920E "“ 150, N1960E , which caused the formation of fault in the direction of NE - SW and N - E. Third, Plio-Pleistocene Stress with the 1 direction 140, N1980E. This latest stress caused the reactivation of the fault groups which occurred previously.
Bergenin, Suatu Dihidroisokumarin dari Kayu dan Kulit Batang Shorea Stenoptera Burck§ Euis Holisotan Hakim; Rudiyansyah Rudiyansyah; Iqbal Musthapa; Koichi Takeya
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.1

Abstract

Bergenin, a dihydroisocoumarin derivative of glucopyranosyl gallic acid had been isolated for the first time from ethyl acetate extracts of the heartwood and tree bark, together with (-)-α-viniferin from the tree bark of Shorea stenoptera. The structure of bergenin was elucidated based on analysis of spectroscopic data UV, IR, MS, 1H and 13C NMR. Bergenin showed weak cytotoxic activity against murine leukemia P-388 cells (IC50 >100 μg/mL), and also weak toxicity against Artemia salina shrimps (LC50 >500 μg/mL).
Pengaruh Jenis Poliol terhadap Pembentukan Poliuretan dari Monomer PEG400 dan MDI Eli Rohaeti; N. M. Surdia; Cynthia L. Radiman; E. Ratnaningsih
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.2

Abstract

The properties of polyurethane depend largely on building blocks, especially the kind of polyol. Not only pure synthetic compounds but also various natural substances such as saccharides (glucose, fructose, maltose, sucrose) and amylose can be used as possible resources of polyol in polyurethane synthesis. Those natural substances are natural polymeric materials having appropriate reactivity thank to its functional groups such as hydroxyl groups. Natural polymers having more than two hydroxyl groups per molecule can be used as polyols for polyurethane synthesis. In this study, the effect of addition of saccharide (glucose, maltose) and amylose in the synthesis polyethylene glycol 400 (PEG400) and methylene-4,4'-diphenyldiisocyanate (MDI) based polyurethane was studied by measuring the hydrogen bonding index (HBI) and the thermal properties. Characterization of functional groups in resultant polyurethane was analyzed by FTIR spectrophotometry, the thermal properties were conducted with Differential Thermal Analysis (DTA), Differential Scanning Calorimetry (DSC), and Thermal Gravimetric Analysis (TGA). The addition of saccharide (glucose, maltose) and amylose on the synthesis polyurethane from polyethylene glycol 400 (PEG400) and methylene-4,4'-diphenyldiisocyanate (MDI) can increase the hydrogen bonding index and the glass transition temperature of polyurethane. In all case the increase of glucose unit in polyol can increase the hydrogen bonding index, the glass transition temperature, and the thermal stability of polyurethane.
Domain Motion in 3-isopropylmalate dehydrogenase: A Strategy to Enhance its Thermal Stability Zeily Nurachman; Tairo Oshima; Nobuo Tanaka
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.6

Abstract

In order to elucidate the thermal properties of Thermus thermophilus 3-isopropylmalate dehydrogenase, mutant structures with mutations at the C-terminus were compared with each other. The structural movement can be anticipated from the structural changes among mutants in regions of a minor groove and pillar. Our previous studies revealed that the open-close movement of the active site groove antagonizes to that of the minor groove (like a paperclip) and the thermostability of the enzyme increases when the active site groove is closed. In the present study, it is shown that the motion of the enzyme mainly occurs in the first domain and strand D in the pillar structure is a hinge-bending region of the movement. The motion of the first domain to expand the minor groove may close the active site groove suggesting a mechanism for the enhanced thermal stability of 3-isopropylmalate dehydrogenase.
The Non Linear Finite Element Model for Characterization of Brick Masonry Infill Wall under Cyclic Lateral Forces B. Budiono; Herwani Herwani
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.4

Abstract

Brick masonries as the infill walls between columns, for some degree of horizontal loading, are capable of resisting the horizontal load as shear walls. The different behavior of the structure due to the existence of the brick masonries in this case will change the stiffness as well as the strength of the structure. Ignoring this contribution of the brick masonries develops a misleading concept and design for the structure. In this study, a mathematical model representing the relationship between uniaxial stress vs. strain and the failure envelope of the infill brick wall masonry is developed. The implementation of the model is expected to be capable for analyzing the behavior of the structures subjected to external load in particular under cyclic loading. The model assumes that the contribution of the infill walls are taken into account for the analysis and the brick material used is considered as a compression dominated material. Analysis was carried out using non-linear discrete finite element method. Eight nodal isoparametric elements are developed representing concrete and brick masonry elements. Steel reinforcement and linkage elements are modeled as three nodal plane truss element. The variables studied in the analysis are degree of energy dissipation and stiffness degradation. The result showed that the model gives satisfactory results. However, some improvement needs to be considered in the linkage element model.
Kultur Campuran dan Faktor Lingkungan Mikroorganisme yang Berperan dalam Fermentasi “Tea-Cider” Pingkan Aditiwati; Kusnadi Kusnadi
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.5

Abstract

Tea is agricultural product containing beneficial substances, especially used for human health. The study of "Tea-cider" fermentation has been conducted using batch culture method. The purposes of the study were to observe mixed microbial culture which were actively involved in the process of "Tea-cider" fermentation, to determine the optimum fermentation conditions, as well as to evaluate the inhibition effect of the product against pathogenic bacteria. The study was carried out in two steps. Firstly, the isolation of microorganisms from "Tea-cider"; secondly producing "Tea-cider" using mixed microbial culture isolated from "Tea-cider" and "Tea-cider" itself as inoculum. Type and concentration of inoculum were optimized for the fermentation process. Mixed of the pure culture of isolated microorganisms with variation of initial cell at ratio B : K1 : K2 = 1 : 1 : 1, 3 : 1 : 1 and 5 : 1 : 1 while the variation of inoculum were 5%, 10%, and 15% (v/v). Optimization in temperature, pH and sugar concentration at the variation of temperature 250C, 280C, 300C, and 350C, pH of 4, 5, and 6, and sugar concentration 5%, 10%, and 15% (w/v) respectively. The pH, acid concentration, reducing sugar concentration and alcohol concentration were analized at 48 hours interval during 14 days fermentation. The product was tested for antimicrobial effect using agar diffusion method and for organoleptic. The result showed that mixed microbial culture which were actively involved in "Tea-cider" fermentation were yeast Schizosaccharomyces pombe (K1) dan Brettanomyces sp (K2), and a species af aceticacid Acetobacter xylinum (B). The optimum condition of "Tea-cider" fermentation were as follows, the ratio of B : K1 : K2 optimum mixed culture inoculum at 5 : 1 : 1 and 10% (v/v) for the inoculum. The incubation temperature was 300C, the medium initial pH was 5 and the intial sugar concentration was 10% (w/v). The "Tea-cider" product was able to inhibit the growth of some pathogenic bacteria such as Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli and had a good preferred taste.
Variasi Nilai Gradien Hidrolik dan Pengaruhnya terhadap Perubahan Nilai Tahanan Jenis pada Sistem Akifer Bersudut Berdasarkan Pendekatan Model Fisik Budiono Budiono; Deny Juanda Puradimaja; Sulistijo Sulistijo
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.7

Abstract

The core of this research is simulation on a physical model of inclined confined aquifer in laboratory scale. The model dimensions is 79.50 cm long, 78.00 cm wide, and 10.00 cm tall. The aquifer is simulated as single confined aquifer with thickness of 8 cm. The aquifer material is composed of coarse sand with good gradation and has uniformity coefficient of 7.105. The measurements consist of elevation head (z), pressure head (hp), total head (h), and resistivity with Schlumberger configuration. The confined aquifer layer is set up to be horizontal. Then, in order to get the hydraulic gradient and dip layer variations, the position of the model box is inclined with varied degree of: 00, 100, 200, and 270. To get the most representative result, the resistivity is measured with line spread parallel to strike and perpendicular to strike.The analysis shows that the increase of the hydraulic gradient (i) have the tendency to cause the decrease of true resistivity values (ρ). Based on the line spread direction and R2 values, there are 2 representatives equations as follows: 1). With line spread parallel to strike:4,88ln()64,60ρ=−+i;R2=0,95. 2). With line spread perpendicular to strike without correction on AB/2 and K value:ρ=;R3,80ln()58,20−+i2=0,99.

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