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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 339 Documents
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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.
Estimasi Daya Dukung dan Pola Pertumbuhan Populasi Keong Lola (Trochus niloticus) di Pulau Saparua, Kabupaten Maluku Tengah Handy Erwin Pier Leimena; Tati Suryati Subahar; Adianto Adianto
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

This study was conducted to estimate the carrying capacity and population growth pattern of lola snail (Trochus niloticus) in Saparua Island. Samples were collected by strip transect method which was 100 meter long and 2 meter wide and were laid perpendicular to the coast line starting from the lowest tide level. Data were analyzed by Bhattacharya method to determine the age classes each individuals. The results showed that the population density was 620 individual/ha and the net reproductive rate of lola was 226 individuals and generation time was 2.88 years. Based on these this results, the carrying capacity which is the theoritical maximum density of lola snail population can be estimated to be 27.779 individuals per hectare and its population growth can be described by equation Nt = 27,779/e4.232-.,884. On the other hand the optimum population growth would be obtained when the population density equalled to 13.890 individuals in 2.25 years.  
ℤ6-II Orbifold Model of the Heterotic String Freddy Permana Zen; Bobby Eka Gunara; Asep Yoyo Wardaya
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

We study a ℤ6-II orbifold model which is derived from the ten-dimensional SO(16) × SO(16) heterotic string theory whose the extra six dimensional space is devided by the ℤ6-II rotations. All independent embeddings are classified using both shifting and rotation procedures of an SO(16) × SO(16) root lattice. SO(10) × SU(3) × U(1) × SO(16) models are elucidated as examples among the models.
Sifat Listrik Film Tipis SrTiO3 untuk Kapasitor MOS Darsikin Darsikin; Khairurrijal Khairurrijal; Sukirno Sukirno; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Strontium titanate (SrTiO3) film was successfully deposited on a silicon substrate by using a pulsed-laser ablation deposition (PLAD) technique. The optimum temperature is 600o C. The electrical properties measurement was metal-oxide-semiconductor capacitor. The film exhibits good insulating property at room temperature. The fixed charge density and leakage current density were also calculated. The results show that the films have promising applications as alternative gate dielectrics.
Penumbuhan Lapisan Tipis µc-Si:H dengan Sistem Hot Wire PECVD untuk Aplikasi Divais Sel Surya Syamsu Syamsu; Darsikin Darsikin; Iqbal Iqbal; Jusman Jusman; Toto Winata; Sukirno Sukirno; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Microcrystalline hydrogenated silicon thin films have been grown on corning 7059 by using Hot Wire Plasma Enhanced Chemical Vapor Deposition (PECVD) system. Silane gas dilute in hydrogen gas (SiH4: H2 = 1 : 10 ) used as gas source. The effect substrate temperatures on deposition rate, optical, electrical and structural properties were analyzed. The deposition rate was varied from 3.22-5.24 µm/hour at temperature 175-275o C, SiH4 flow rate of 70 sccm, and filament temperature ~ 1000oC. The optical band gap varied from 1.13-1.44 eV at substrate temperature of 175-275. The Result XRD characterization of µc-Si: H thin film was grown at 275o C shows , , and orientation. Dark conductivities vary from 10-6-10-4 S/cm The Dark conductivity of µc-Si: H is higher than a-Si: H thin film. This result shows that µc-Si: H thin film is possible for p-i-n solar cells device application.  
2’,4’-Dihidroksi-3’,5’,6’-Trimetoksi Calkon suatu Senyawa Antitumor dari Kulit Batang Tumbuhan Cryptocarya costata (Lauraceae) Hanapi Usman; Euis Holisotan Hakim; Sjamsul Arifin Achmad; Tjodi Harlim; Muhammad N. Jalaluddin; Yana Maolana Syah; Lia Dewi Juliawati; Lukman Makmur; Mariko Katajima
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Sifat Listrik Film Tipis SrTiO3 untuk Kapasitor MOS An anti-tumor calcon has been isolated from Criptocarya costata stem bark. The compound was obtained from chloroform fraction fractioned by chromatography technique and recrystalized in n-hexane and ethyl acetate. The compound structure elucidated based on physical and spectroscopic data was 2,4-dihydroxy-3,5,6-trimethoxy calcon. Cytotoxic assay using murine leukemia cell P388 showed positive activity with IC50 value of 3.65 µg/mL.

Page 9 of 34 | Total Record : 339

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