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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 7 Documents
 1 
Search results for , issue " Vol 9, No 1 (2004)" : 7 Documents clear
Pengaruh Inokulasi Cacing Tanah (Pontoscolex corethrurus Fr Mull) Terhadap Sifat Fisika Kimia Tanah dan Pertumbuhan Tanaman Kacang Hijau (Vigna radiata L.Wilczek) Varietas Walet Adianto Adianto; Diah Utami Safitri; Nuryati Yuli
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

The effect of earthworm inoculation on soil physical and chemical properties and the growth of mung bean inexperimental pot had been studied. Earthworms were inoculated at four different densities i.e. 0 (Co), 4 (C4), 8 (C8)and 12 (C12)individuals in pots containing clay : humus : sand (5 :3 : 2) dry weight and kept for 120 days. Cowdung were applied ad libitum. The control (without earthworms inoculation) consisted of two groups ; with andwithout dung ( Co- and Co+). The results of this experiment indicated that the rate of microorganism respirationwas highest in C12 treatment and significantly different (p < 0,05) from Co- and Co+. Cellulose decompositionlevel was also highest in C12 treatment compared to Co-. Soil physical analysis indicated that total porosityincreased significantly in C8 and C12 treatment compared to Co- and Co+ . Water permeability increasedsignificantly in C4 treatment compared to Co-. Soild chemical analysis indicated that soil pH increased due toearthworm inoculation. Organic Carbon decrease in accordance with the increasing number of earthworm, thehighest decreaseng in C12 treatment and the lowest in Co-. The N,P,K,Ca and Mg level increased in all treatmentscompared to Co-.. The plant height increased significantly in C8 and C12 treatment compared to Co- and Co+.Furthermore plant biomass increased significantly in treatment C12 compared to Co- and Co+. It can beconcluded that inoculation with earthworms could change the soil physical and chemical properties and improvedconditions for the growth of mung bean.
Structural Study of Bis(2,6-bis(pyrazol-3-yl)pyridine)nickel(II) by Calorimetry and EXAFS Spectrometry Kristian H. Sugiyarto
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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The stepwise complex formation of 2,6-bis(pyrazol-3-yl)pyridine, bpp, with nickel(II) perchlorate in DMF has beendetermined by calorimetric method and then followed by EXAFS spectrometry. It was found that the complexformation follows two stepwise pathways namely the formation of mono pyrazolyl-pyridine, [Ni(DMF)3 bpp]2+, andbis pyrazolyl-pyridine, [Ni(bpp)2]2+; the formation constants being log β1 = 6.57, and log β2 = 5.02, respectively,with the total value of log β = 11.58. The final formation of six-coordinated compound was confirmed by EXAFSanalysis with coordination number of 5.87(2) and the average of Ni–Nbpp bond length of 2.065(1) Å.
Lantaden XR Glikosida dari Daun Lantana camara L. Rumondang Bulan; Soekeni Soedigdo; Sadijah Achmad; Buchari Buchari
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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Isolation and purification of lantadene XR glycoside compound related to lantadene compound, from Lantana camara L. leaves had been done. Structure elucidation was performed by interpretation of spectroscopic data, including UV, IR, MS, 1H and 13C-NMR. This compound is cytotoxic against of L1210 leukemic cell with IC50 of 2.23 μg/mL.
Aplikasi Analisis Komponen Utama dalam Pemodelan Penduga Lengas Tanah dengan Data Satelit Multispektral Erna Sri Adiningsih; Mahmud Mahmud; Iskandar Effendi
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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Principle Component Analysis (PCA) application in modeling the soil moisture estimate using multispectral satellite data is meant to optimize spectral combination. PCA method has been applied to Landsat Thematic Mapper (TM) satellite data with good results. However, Landsat data have low temporal resolution (16 days) compared with daily NOAA-AVHRR (NOAA-Advanced Very High Resolution Radiometer) satellite data. So, NOAA-AVHRR data are able to provide better information on daily soil moisture. The objective of the study is to develop soil moisture estimation model based on daily 5-channel daily NOAA-AVHRR data using PCA method. The locations are West Java and Central Java as case study, while the period is August-September 1999. Some field soil samples were also taken from the two locations. The coefficient of variance shows that the three principle component (PC) can explain the variance of soil moisture of 0-20 cm depth better than of >20 cm depth. This is due to more dynamic surface soil moisture change rather than deeper soil layer. Among the three PCs, the first PC is the best parameter to estimate soil moisture. The index resulted by the first PC can estimate soil moisture better than vegetation index.
Efek Gosipol terhadap Kontraksi Usus Halus Mencit (Mus musculus) Swiss Webster Jantan secara in vitro Darmadi Goenarso; Suripto Suripto; Zulfiani Zulfiani
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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The in vitro effect of gossypol on the small intestinal contractility of Swiss Webster mice have been examined. Thirty six sexually mature male mice with body weights of 30,5-36,5 g. were used and the tested concentrations of gossypol were 5, 7.5, and 10 ppm. Segments of the small intestine such as: duodenum, jejunum and ileum were isolated and immersed in Tyrode solution at 37 oC. The contractions of these organs were measured and recorded using a myograph and physiograph. As control, the contractions of these organs were recorded in Tyrode solution for 360 seconds. The solution was then replaced by gossypol-Tyrode solution and the contractions were recorded again for the next 360 seconds. The results showed that gossypol increased shortly and followed by gradual decreases of tension in all small intestinal segments. Gossypol also lowered the frequency of the intestinal contractions when compared with control. The strongest action of gossypol was found when the intestines were treated in 10 ppm, compared to the action of those treated with 7.5 ppm and 5 ppm. It is assumed that gossypol impaired peristaltic movements of the intestines and thus decreased digestibility of mice.
Size Dependent Phase Transition in BaTiO3 and PbTiO3: a General Theory Based on a Simple Ising Model Mikrajuddin Abdullah
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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A general theory based on simple Ising model has been developed to explain the effect of size on the phase transition in BaTiO3 and PbTiO3. The model can explain very well the presence of critical temperature for the occurrence of tetragonal ⇔ cubic structure, the presence of critical size where this transition to occur. Size dependent of the transition is induced by the dependence of dipole-dipole interaction in the sample on the size.
Studi Elektrokimia Sistem Fe(III)/Fe(II) dalam Lelehan KOH secara Voltametri Siklis Buchari Buchari; Suprapto Suprapto
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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Electrochemical study of Fe(III)/Fe(II) system in molten KOH by cyclic voltammetry has been investigated using platinum wire, antimony wire and gold wire as working, reference and counter electrodes respectively. The solution of ferric and ferrous salts in molten KOH were maintened at 210 oC. Cyclic voltammogram of FeCl3 and FeCl2 showed electrochemical system of Fe3+/Fe2+ and Fe3+/Fe at the electrode potentials : 1.3 and 0.8 V respectively versus antimony electrode. In molten KOH, Fe(CN)63- decomposed to Fe3+, meanwhile Fe(CN)64- is oxidised to Fe(CN)63- and followed by its decomposition to Fe3+. The electrochemical parameters in aqueous to be tested in this study are applicable in molten KOH.

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