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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 6 Documents
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Search results for , issue " Vol 9, No 3 (2004)" : 6 Documents clear
Populasi Planaria di lokasi Bukit Tunggul dan Maribaya, Bandung Utara Hertien Surtikanti
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Planaria sp. is an organism inhabiting clean freshwater. The presence of Planaria sp. is diminishing at several locations. In order to understand the influence of environmental factors to the population of Planaria sp., field study on density and biomass of Planaria sp. has been carried out in two study locations Bukit Tunggul and Maribaya stream. These two streams have been known to be less impacted sites located of the Cikapundung River. Planaria sp. was sampled using plots 50 cm x 50 cm, to once a month in March, April and May 2002. These samples were brought to the laboratory of Ecology for density enumeration (density/m2) and biomass determination (gr/individual). Water quality parameters (dissolved oxygen, conductivity, pH, turbidity and temperature) at these two locations were measured in the field. Statistical analysis results showed that: (a) the density of Planaria sp. was significantly different (P
Penumbuhan Film Tipis Ti1-xCoxO2 Dengan Metode MOCVD Horasdia Saragih; Mersi Kurniati; Akhiruddin Maddu; Pepen Arifin; Moehamad Barmawi
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

The Ti1-xCoxO2 thin films have been successfully deposited on Silicon (Si) substrates by metalorganic chemical vapor deposition (MOCVD). The Ti1-xCoxO2 thin films with x = 0 is grown at deposition temperature of 450oC with argon and oxygen flow rate of 100 sccm and 60 sccm, respectively. The deposited film has a single orientation of (213)-anatase. The films consist of nanometer size of columnar grains. The growth rate was increased with increasing Co content and therefore the grains become larger. Generally, the crystal structure of films was affected by Co atom concentrations, however at temperature deposition of 450oC and argon flow rate of 70 sccm, the film has the initial structure of (213)-anatase and co-exist with (301)-anatase which is not dominant. The film thickness is about of 0,9 μm for an area of 3x3 cm2.
Kapasitor MOS dengan dielektrik Ceria Amorf Khairurrijal Khairurrijal; Darsikin Darsikin; Maman Budiman
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Amorphous ceria (CeO2) thin films were deposited on a silicon (100) substrate by using a pulsed-laser ablation deposition (PLAD) technique. The substrate temperature was varied from 600 to 7000 C and the ambient was a pure oxygen gas at the pressure of 100 mTorr. It was found that the growth rate is 17.5 nm/min. Low fixed-charge densities (1011/cm2) and high resistivies (109-1012 Ω cm) of the CeO2 thin films indicate that the films could be used for oxide layer of metal-oxide-semiconductor (MOS) capacitors. Electron conduction mechanism in the CeO2 thin films is ohmic at voltages below 1 V while that at voltages above 1 V are due to quantum tunneling process.
Analisis Hubungan Frekuensi-Magnitudo Gempa Bumi di Bali dan Sekitarnya Wandono Wandono; Sri Widiyantoro; Gunawan Ibrahim; Edy Soewono
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

We mapped the 3-D b-value variation in Bali and its vicinity through analyzing the frequency-magnitude relation. A high b-value anomaly is observed beneath the Lombok volcanic arc at 90-180 km depth interval. It is related to the zone of partial melting of basaltic magma on the subducted slab of Indian oceanic plate beneath the Eurasian plate in Nusa Tenggara Barat. This analysis supports the hypothesis about the existence of melting point on the slab.
Sintesis dan Karakterisasi Senyawa BerstrukturAurivillius Empat dan Lima Lapis dan Penentuan Sifat Feroelektriknya Edi Mikrianto; Ismunandar Ismunandar
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Aurivillius oxides with composition of Na0,5Bi4,5Ti4O15 (NBT), K0,5Bi4,5Ti4O15 (KBT), Sr4Bi2Nb2Ti3O18 (SBNT), Ba4Bi2Nb2Ti3O18 (BBNT)and Bi5Ti5FeO18 (BTF) have been synthesised using the solid state reaction. The obtained oxides were polycrystalline. All the oxides were white, except that Bi5Ti5FeO18 was brick red in colour. Structure type determination was carried out using Phasanx software and PDF data base. It can be concluded that all oxides adopted orthorhombic crystal system and space group A21am with unit cell parameter a = 5.427(2) Å , b = 5.459(3) Å and c = 40.78(2) Å for Na0,5Bi4,5Ti4O15; a = 5.430(1) Å, b = 5.5258(6) Å and c = 50.747(5) Å for K0,5Bi4,5Ti4O15 ; a = 5.5439(9) Å ; b = 5.5258(6) Å and c = 50.747(5) Å for Sr4Bi2Nb2Ti3O18 ; a = 5.540(2) Å, b = 5.579(4) Å and c = 50.962(8) Å for Ba4Bi2Nb2Ti3O18 ; whilst for Bi5Ti5FeO18 a = 5.520(1) Å, b = 5.569(3) Å and c = 50.36(1) Å. Ferroelectric properties measurement showed that polarization remanent Pr(+) and Pr(-) 0.049 μCcm-2 for Na0,5Bi4,5Ti4O15 ; 0.051 μCcm-2 for K0,5Bi4,5Ti4O15; 0.045 μCcm-2 for Sr4Bi2Nb2Ti3O18; 0.050 μCcm-2 for Ba4Bi2Nb2Ti3O18 and 0.050 μCcm-2 for Bi5Ti5FeO18.
SINTESIS FAUJASITE DARI ABU LAYANG BATUBARA : Pengaruh Refluks dan Penggerusan Abu Layang Batubara terhadap Kristalinitas Faujasite Sutarno Sutarno; Yateman Arryanto; Arief Budhyantoro
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Synthesis of Faujasite from coal fly ash has been conducted which involved reflux, grinding fusion and hydrothermal reaction. Coal fly ash is refluxed with hydrochloric acid 5 M at 90 oC for 5 hours. Grinding effect of refluxed coal fly ash on Faujasite synthesis has been studied as other variable on synthesis of Faujasite. Coal fly ash is mixed with NaOH pellet which NaOH : coal fly ash ratio = 1.2, and then fused at 550 oC for 1 hour. Fused coal fly ash is mixed with 100 ml distilled water, stirred and aged for 24 hours. The resulted solution was then reaeted with hydrothermal bomb autoclave at 100 oC for 3 days. The result was characterized with X-ray diffraction using diffractometer shimadzu 3001. The experimental data showed that coal fly ash refluxed with hydrochloric acid 5 M increased in Si/Al ratio of coal fly ash. Synthesis of Faujasite with coal fly ash refluxed with HCl 5 M as raw material produced good crystallinity Faujasite, but the used of unrefluxed coal fly ash as raw material on synthesis of zeolite gave hydroxysodalitet. Synthesis of Faujasite from ungrand coal fly ash whichh is refluxed with HCl 5 M gave better Faujasite crystallinity than that of the grund one.

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