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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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The Total Edge Irregular Strengths of Union Graphs of K2,n Nurdin Nurdin; Edy Tri Baskoro; Muhammad Salman Alfarisi Nawawi
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

For a simple graph G = (V, E) with the vertex setV and the edge setV, a labeling l :V ÈE ® {1,2,...,k} is called an edge irregular total k-labelling of G if for any two different edges  e = e e1 e e2 and  f = f1 f2 in E (G) we have wt (e) wt (f ) where (e) = l (e1) + l (e ) + l (e2 ). The total edge irregular strengths tes (G) of G is the smallest positive integer k for which G has an edge irregular total k-labelling. In this paper, a dual of an edge irregular total klabelling is introduced. Beside that, the total edge irregular strengths of a graph mK2,n -path and a graph mK2,n for any positive integer m ≥  1 and n ≥ 2 have been determined.
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.
Efektivitas Teknik Kultur menggunakan Sistem Kultur Statis, Semi-kontinyu, dan Kontinyu terhadap Produktivitas dan Kualitas Kultur Spirulina sp. Gede Suantika; Deri Hendrawandi
Jurnal Matematika & Sains Vol 14, No 2 (2009)
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Abstract

Cyanobacteria, Spirulina sp., is used in many industries such as aquaculture, medical, and food industry due to its high nutrient level such as protein, fatty acid, vitamin, and antioxidant. In this experiment, three different culture techniques of batch culture, semi-continuous culture, and continuous culture were tested and developed in order to evaluate their effects on Arthrospiras culture production. During 24 days of culture period, batch culture biomass produced was 6.53±0.16 g, semi-continuous culture was 7.51±0.22 g, and continuous culture was 5.42±0.02 g. The highest contaminant presence was obtained in continuous culture, the highest pH level was found in semi-continuous culture. The highest concentration of nitrate, nitrite, ammonium, and orthophosphate was measured in continuous culture. Based on the result, it can be concluded that semi-continuous culture can produce highest biomass for 24 days culture period with a total production of biomass was 7.51±0.22 g and can maintain the stability of water quality.
Extracellular Products of Streptococcus pyogenes and Their Involvement in Pathogenesis Debbie Soefie Retnoningrum
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Streptococcus pyogenes or group A streptococcus (GAS) is an exclusive human pathogen. To be a successful pathogen, this pathogen is equipped with various surface-exposed and secreted virulence factors. The functions of secreted virulence factors are particularly important since they interact with host components to establish infections and cause diseases in human. They include a number of proteases, DNase, superantigens, and plasminogen activator. How these secreted factors interact with host protein(s) define this pathogens ability to bring out various diseases. Several proteases act independently to target immunoglobulin molecules in order to evade host defense system and modulate host proteins to induce host-mediated damages. Besides producing proteases, many pathogenic strains of GAS also produce DNase; however, its involvement in host pathogenesis remains elusive. Superantigen, another secreted protein is responsive for serious host-destruction by bypassing antigen presentation to induce massive production of cytokines. GAS also secretes a plaminogen activator, streptokinase that is crucial for invasiveness. All together, secreted products of this pathogen work in concert to pinpoint different targets in order to destroy and or to disable human defense system and cause host damages.
Mengembangkan Kemampuan Mahasiswa dalam Memvalidasi Bukti pada Aljabar Abstrak melalui Pembelajaran Berdasarkan Teori APOS I Made Arnawa
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

This is an experimental study using control group pretest posttest design. The experiment group is treated using APOS theory instructional. The control group is treated using conventional/traditional mathematics instruction (TRAD). The main purpose of the study is to analyze the contribution of APOS in developing student ability to validate proof in Abstract Algebra. This experiment involves 180 students as research subjects from two different universities that is department of mathematics UNAND and department of mathematics educations UNP. The data was gathered by proof validated test. Based on the result of data analysis, the main result of this study is: ability in proof validated of students in APOS group is significantly better than the students in TRAD group.     
Micelle Formation and Surface Adsorption of Sodium 4-Octyl Benzene Sulfonate (S4OBS) in Water Solvent Muhammad Rusdi
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

The surface tension was measured against the concentration of S4OBS at temperatures of 300.2, 308.2, and 318.2 K, from which the critical micelle concentration (CMC) was determined. The CMC decreased with increasing temperatures. The thermodynamic parameters (DGo, DHo and DSo) of the micelle formation were calculated from the temperature dependence of CMC and the micellization was found to be entropy-driven. The surface excess concentration (G) was also determined from the change in the surface tension with the concentration from which the molecular surface area (A) below the CMC was evaluated. The molecular surface area suggests that thermal agitation at higher temperature more dominant than at lower temperature. The positive entropy change (DSo) for the surface adsorption decreased and stayed almost constant with increasing concentration of S4OBS.
Theoretical Prediction of Mixing Efficiency in Stratified Shear Exchange Flows Tjipto Prastowo
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Mixing efficiency in stratified shear exchange flows between two reservoirs of water of differing densities is analytically investigated in detail in the light of a two-layer flow. The theoretical prediction of mixing efficiency is presented here in terms of a scaling analysis developed for such flows. The prediction is compared with that derived from measurements of normalised density profiles. The predicted mixing efficiency is found to be 0.125, independent of flow conditions and external parameters used. This value is approximately the same as 0.12, obtained from the averaged density profiles, and is close to a half of 0.2, the widely proposed value for the average efficiency in the oceans that is frequently assumed in general ocean circulation modeling.

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