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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue " Vol 8, No 1 (2003)" : 8 Documents clear
Crystal Structure, Magnetic Susceptibility, and ESR Measurement of BaCu2(PO4)2 Aripin Aripin; S. Mitsudo; T. Idehara; M. Mekata
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

The crystal structure of BaCu2(PO4)2 has been refined from X-ray powder data. BaCu2(PO4)2 crystallizes into a triclinic structure which belongs to the space group P-1, which unit cell constant a = (9.226±0.023)(1) Å, b = (9.271±0,018)(1) Å, c = (10.516±0,09)(1) Å, α = (106.76±0.12)(5)o, β = (101.65±0.16)(5)o, γ = (115.70±0.3)(5)o, V = (717.96±0.05) Å3, Z = 4, and dcal = 4.20 g.cm-3. The copper atoms constitute isolated magnetic chains parallel to the [001] direction. The magnetic susceptibility measurement was preformed at temperatures ranging from 4.2 K to 300 K. The magnetic susceptibility shows a broad maximum at around 60 K. The magnetic susceptibility has been interpreted in terms of one-dimensional magnetic system. The temperature dependence of the magnetic susceptibility indicated a good agreement with ladder configuration model. In the ESR measurements, clear electron spin resonance (ESR) was observed. The integrated intensity has a broad maximum at around 60 K, which is consistent with the susceptibility result. A quantitative description gives resonance is the first triplet state of the excitation spectrum of ladder configuration.
Nanocomposite of Zinc Oxide and Silica With Stable Luminescence Mikrajuddin Mikrajuddin
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Nanocompsite of zinc oxide (ZnO) and silica (SiO2) has been produced by spray drying the mixture of ZnO and SiO2 colloids. Initially, ZnO colloid was produced by hydrolizing zinc acetate in ethanol solution and then reacted with lithium hydroxide solution. Colloid of ZnO containing nanometer-scaled particles was mixed with SiO2 colloid at definite fractions, atomized using an ultrasonic nebulizer and dried in a vertical reactor using nitrogen carrier gas. The produced powder showed a time independent luminescence spectra that is important for industrial applications.
Dampak Enso pada Faktor Hujan di Indonesia Bayong Tjasyono HK; Bannu Bannu
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

The Indonesian region is characterized by the activity of tropospheric convection. In the ENSO (El Niño –Southern Oscillation) event, the convective clouds displace to the eastern Pacific ocean due to the weakened trade winds. The ENSO phenomenon is the biggest player in the game of annual climate variation, while monsoon plays a role in the seasonal variations. The ENSO also brings about serious climate disaster in global area, for instance in the drought Indonesia, in the food Ecuador and so on. The influence of ENSO events is profoundley felt in some parts of the Indonesian region, i.e., the number of rainfall less than that in the pre and post ENSO years. The ENSO event also causes long dry season in the several parts of the Indonesian region, it means that rice planting will be very late. The isolines of rain factor of the value less than 5 covered a greater area in the ENSO year than that in the non ENSO years.
Beberapa Senyawa Stilbenoid Dari Kulit Batang Shorea Leprosula Miq. I Nyoman Adi Winata; Yana Maolana Syah; Sjamsul Arifin Achmad; Euis Holisotan Hakim; Lia Dewi Juliawaty; Emilia L Ghisalberti; M I Choudhary
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Three stilbenoid compounds, hopeaphenol (1), laevifonol (2), dan (+)-α-viniferin (3) had been isolated from acetone extract of the stem bark of Shorea leprosula Miq. The molecular structures of (1), (2), and (3) was determined based on spectroscopic data, including UV, IR, 1H NMR, and 13C NMR, and comparison with that reported in the literature.
Trend Pembentukan Piroklor Ln2Te2O7, Ln = La, Nd, Eu dan Gd Ismunandar Ismunandar; Irawan Haryanto; Santi Dewi
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

As an extension of Weber, F. A. and Schleid, T. work, attempts to prepare Ln2Te2O7, Ln = La, Nd, Sm, Eu and Gd using the solid state reaction have been conducted. The products were characterized using X-ray powder diffraction methods. La2Te2O7 (a = 11,3821 Å) was formed with impurities TeO3, La2O2Te and La2TeO6, while for Nd2Te2O7 (a = 11,1564 Å) the impurities were TeO3, Nd2O2Te and Nd2TeO6. Both were decomposed above 850 °C. Neither Eu nor Gd formed pyrochlore, instead mixtures with dominant phases of Ln2Te2O7.2. It could be supposed that ionic radii of Eu and Gd too small to stabilize pyrochlore structure. Attempts to prepare Bi2Te2O7 and Pb2Te2O7 have not successful yet.
Laevifonol, Diptoindonesin A, dan Ampelopsin A, Tiga Dimer Stilbenoid dari Kulit Batang Shorea seminis V. Sl. (Dipterocarpaceae) Nanik Siti Aminah; Sjamsul Arifin Achmad; Euis Holisotasn Hakim; Yana Maolana Syah; Lia Dewi Juliawaty; Emilia L. Ghisalberti
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Laevifonol (1), a dimer stilbenoid, namely a hybrid between ε-viniferin and ascorbic acid had been isolated from ethyl acetate extract of the stem bark of Shorea seminis V.Sl. The structure of this compound was determined on the basis of spectroscopic data.
Beberapa Senyawa Fenol dari Tumbuhan Morus macroura Miq. Nunuk H Soekamto; Sjamsul Arifin Achmad; Emilio L Ghisalberti; Norio Aimi; Euis Holisotan Hakim; Yana Maolana Syah
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Three stilbene derivatives, namely lunularin (1), oxyresveratrol (2), and andalasin A (3), together with 2-arylbenzofuran derivative, moracin M (4), coumarin derivative, umbelliferon (5), and β-resolcylaldehyde, were isolated from Morus macroura Miq. (Moraceae), a rare spesies found in West Sumatera and endemic to Indonesia. The structures of all these compounds were elucidated based on physical and spectroscopic data.
Stenofilol B dan Hopeafenol, Dua Oligomer Stilbenoid dari Kayu Batang Sri Atun; Sjamsul Arifin Achmad; Euis Holisotan Hakim; Yana Maolana Syah; Emilio L Ghisalberti; Lia Dewi Juliawaty
Jurnal Matematika & Sains Vol 8, No 1 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Two oligostilbenoid, namely stenophyllol B (1) and hopeaphenol (2) had been isolated from the stem bark of Vatica umbonata Burck (Dipterocarpaceae). The structure of both compounds were elucidated based on spectroscopic data. Both compounds exhibited strong toxicity againts murine leucaemia cell P-388 with IC50 : 8,5 μg/ml and 2,9 μg/ml, respectively.

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