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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 4 Documents
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Search results for , issue " Vol 4, No 1 (1999)" : 4 Documents clear
The Influence of Meteorological Factors on Tropospheric Refractive Index over Indonesia Bayong Tjasyono HK.; Djakawinata S. Djakawinata S.
Jurnal Matematika & Sains Vol 4, No 1 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

Since the troposphere is a non homogeneous medium with vertical variation of meteorological factors, it would be expected vertical gradients of the refractive index and, as a result, a refration of radio waves. This study higlights results of the radiosonde observations in Serpong, West Java. The results show that the refractive index decreases with altitude and in the lower troposphere, this index has a diurnal fluctuation due to the variation of meteorological factors.  
Penggunaan Differential Thermal Analysis (DTA) Pada Penentuan Aktivitas Dan Reaktivitas Katalis Fe2O3, Co3O4, NiO, CuO, dan LaMO3 (M=Fe, Co, dan Ni) Untuk Oksidasi CO Menjadi CO2 Djulia Onggo; Hamzah Fauzi
Jurnal Matematika & Sains Vol 4, No 1 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

The catalyst activity of Fe2O3, Co3O4, NiO, CuO, and LaMO3 (M = Fe, Co, and Ni) has been determined using Differential Thermal analysis apparatus. The increased temperature rate has been used at 25oC per min. in the atmosphere of 40% CO, 40% N2 and 20% O2. Mixture gases. The analysis result shows that the order of catalytic activity is Co3O4 > CuO > Fe2O3 > NiO > LaCoO3 > LaFeO3 > LaNiO3. Beside of catalytic activity, this method can be used to determine the starting temperature of carbon monoxide oxidation reaction, which refer to the catalytic reactivity. The order of catalytic reactivity is Co3O4 > CuO > NiO > Fe2O3 > LaCoO3 > LaNiO3 > LaFeO3.
Antaraksi Fisik Padatan Pada Kombinasi Senyawa Aprobarbital dan Isopropilantipirina Sundani Nurono
Jurnal Matematika & Sains Vol 4, No 1 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

The influence of mechanical and thermal energy to the physical mixture of (1:9), (3:7), (1:1), (7:3) and (9:1) of two drugs namely aprobarbital and isopropylantipyrin as representative model of sedative and analgetic-antipyretic groups has been carried out. In fact, both of those substances could part of physically interact to form a molecular compound. Such compound has two eutectic points at 96oC and 123oC, each. Whilst the melting point of the formed molecular compound is 129oC (Thermal analysis method). The molecular compound formation between aprobarbital and isopropylantipyrin was proved by crystallography methods i.e. diffractogram produced by x-ray diffraction, contact methode, thermal analysis (DSC) and microphoto of scanning electron microscope.
Pemodelan Sirkulasi Air Laut Dan Penyebaran Logam Berat Cadmium (Cd) di Kolam Pelabuhan Tanjung Priok Mutiara R. Putri; Dadang K. Mihardja
Jurnal Matematika & Sains Vol 4, No 1 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

In this study we had been used mathematical model that consist of hydrodynamics and pollutant transport two dimensional depth avaraged models. The driven forces of current that considered in the hydrodynamics model are tidal, monsoon wind, and river discharges. The factors that considered in the waste transport model are advection by current, turbulence diffusion, and load waste sources of cadmium (Cd). The model assumtions are constantly load waste from rivers and persistent waste (chemical reactions and degradation by bioactivities are assumed zero). Simulation results show that in Tanjung Priok harbour the distributions of cadmium follow the current pattern and the consentrations has been over ambient which allowed. The average accuracy of model in this study is about 50 to 60%.

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