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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 5 Documents
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Search results for , issue " Vol 14, No 3 (2009)" : 5 Documents clear
On the Nature of Gravity Currents Tjipto Prastowo
Jurnal Matematika & Sains Vol 14, No 3 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

A series of laboratory experiments are used to examine the nature of a gravity current propagating along the base of a horizontal channel. The shear instability formed at the interface between two counter-flowing layers generates turbulence and mixing, particularly above the head of the current. While the resulting mixing is in part examined through its effects on the flow dynamics, the characteristics of the gravity current is determined by measuring the depth and speed of the current. The results for both shallow and deep currents reveal that the current depth is found to be 0.36-0.47 H, where H is the full water depth. The non-dimensional current speed is measured to be 0.48±0.02, independent of flow processes and dynamic variables.
Proses Bioakumulasi dan Biotransfer Merkuri (Hg) pada Organisme Perairan di dalam Wadah Terkontrol Markus Talintukan Lasut
Jurnal Matematika & Sains Vol 14, No 3 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

A study to show bioaccumulation and biotransfer processes of mercury (Hg) has been done in controlled experimental chambers. Three groups of aquatic organisms, namely phytoplankton Nannochloropsis oculata representing producers, fish Lebistes (Poecilia) reticulatus representing herbivorous consumers, and fish Tiger Fish Symphysodon sp. representing carnivorous consumers, were contaminated by two different concentrations of Hg, in form of methylmercury (MeHg), such as 22.6 ppb as Treatment 1 and 79.1 ppb as Treatment 2. Controls were setup for all experiments. The result showed that bioaccumulation process occurred in the experiments and the amount of MeHg accumulated was depended on the amount of supplied MeHg. Biotransfer of MeHg was also indicated in this study. The highest biotransfer of MeHg occurred between the phytoplankton and the herbivorous fish pathway. The study concludes that bioaccumulation and biotransfer processes of MeHg occurred in the experimental pathway and the amount of mercury accumulated and transferred was depended on the amount of mercury supplied.
Studi Teoretis Struktur Elektronik dan Sifat Transisi Spin Kompleks [Fe(dpa)2(NCS)2] Yusthinus Thobias Male; Djulia Onggo; Muhamad Abdulkadir Martoprawiro; Ismunandar Ismunandar
Jurnal Matematika & Sains Vol 14, No 3 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

The computational method B3LYP*/6-31G(d) has been used for predicting the mononuclear spin transition (ST) complexes properties, i.e. [Fe(dpa)2(NCS)2] with cis and trans isomers. Computational results showed that in vacuum and methanol, cis-[Fe(dpa)2(NCS)2] isomer gave a reasonable value of ∆Eel for ST. In methanol, the cis isomer was more stabilized because that isomer showing more higher dipole moments (21,59 D) than the trans isomer and unsubstituted complex, [Fe(dpa)3]2+ (5,70 and 0,03 D). This results showed that if those complexes were synthesized, in the ambient temperature they have high spin properties but only cis-[Fe(dpa)2(NCS)2] isomer has ST properties. Analysis of main atomic orbitals populations showed that the electronic ground bands and the next ground bands are assigned to ligand-to-ligand charge-transfer (LLCT) transitions because of the charge transfer from NCS-ligand to the main ligand. It can be concluded that computational method B3LYP*/6-31G(d) gives more predictive power to mononuclear ST complex.
Dynamics of Intraseasonal Sea Level Variations Observed at Gan Island and Sibolga Iskhaq Iskandar
Jurnal Matematika & Sains Vol 14, No 3 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Dynamics of intraseasonal sea level variability in the central and eastern equatorial Indian Ocean is examined using 66 months (1 January 1993 to 30 June 1998) of the observed sea level at Gan Island (0°41S, 73°E) and Sibolga (1°45N, 98°46E). The analysis shows that the intraseasonal signals of 20-100-day at those two tidal stations are coherent and exhibit eastward energy propagation. These intraseasonal variations are associated with the propagation of equatorial Kelvin waves generated by the zonal winds along the equator. The lag-correlation analysis reveals that their phase speed is closed to the theoretical phase speed of the first and second baroclinic modes of the Kelvin waves.
Pengaruh Korelasi Antar Respon pada Model Multinomial Logit Jaka Nugraha; Suryo Guritno; Sri Haryatmi
Jurnal Matematika & Sains Vol 14, No 3 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Model multinomial logit (MNL) disusun berdasarkan asumsi bahwa komponen erornya berdistribusi nilai ekstrim tipe I (Gumbel) dan saling independen. Dengan asumsi ini, persamaan probabilitas pada masing-masing pilihan berbentuk persamaan tertutup dan konsisten dengan utilitas acak (random utility). Telah dilakukan penyelidikan pengaruh besarnya korelasi antar respon terhadap estimator. Disimpulkan bahwa, jika terdapat korelasi antar respons, estimator maksimum likelihood pada MNL menjadi bias.

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