Jurnal Ilmu Dasar
Jurnal ILMU DASAR (JID) is a national peer-reviewed and open access journal that publishes research papers encompasses all aspects of natural sciences including Mathematics, Physics, Chemistry and Biology. JID publishes 2 issues in 1 volume per year. First published, volume 1 issue 1, in January 2000 and avalaible in electronically since 2012 with ISSN 1411-5735 (Print) and avalaible in electronically since 2012 with ISSN 2442-5613 (online). Jurnal ILMU DASAR is accredited SINTA 3 by the Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia (Kemendibukristek) No. 152/E/KPT/2023 (September 25, 2023), Ministry of Research, Technology and Higher Education of the Republic of Indonesia (RISTEKDIKTI), No. 200/M/KPT/2020 (December. 23, 2020). All accepted manuscripts will be published worldwide JID has been indexed in DOAJ, Dimension, OCLC WorldCat, PKP Index, Crossref, Google Scholar, Base, Garuda, and OneSearch. JID have been collaborated in KOBI-ID (Konsorsium Biologi Indonesia) and HKI (Himpunan Kimia Indonesia) since 2017.
Articles
415 Documents
<![CDATA[Consistency and Asymptotic Normality of Maximum Likelihood Estimator in MARS Binary Response Model ]]>
<![CDATA[Bambang Widjanarko otok]]>
<![CDATA[ Jurnal ILMU DASAR Vol 10 No 2 (2009) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[A good estimator has to fulfill some propertries such as unbiased, efficient and consistent. This research aims to study consistency and asymptotic normality of maximum likelihood estimator in MARS binary response model of Friedman, for predicting the continue response variable, at predictor variables, with linear combination of spline truncated.]]>
<![CDATA[Similarity for Binary Data Based on the Value of Entropy and Structure Patterns Categories ]]>
<![CDATA[Kariyam Kariyam]]>
<![CDATA[ Jurnal ILMU DASAR Vol 11 No 2 (2010) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[Similarity of two objects that have a form of binary data, usually calculated based on the frequencies in thecontingency table that includes all discrete random variables. In this article we will discuss the similaritymeasures for binary data based on entropy values and structural patterns of the two object categories. Measuringsimilarity based on the value of entropy and structural pattern of categories can be used as a validation measureof similarity for binary data.]]>
<![CDATA[Impurity Free Vacancy Disordering (IFVD) of InxGa1-xAs/InP Quantum Well Structures for Monolithic Integration of Different Optoelectronic Devices ]]>
<![CDATA[P L Gareso]]>
<![CDATA[ Jurnal ILMU DASAR Vol 11 No 1 (2010) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[Impurity free vacancy disordering (IFVD) technique has been used to study the atomic intermixing of InxGa1-xAs/InP quantum well structures using a SiO2 and a TiO2 dielectric layer. Three different indium composition in InGaAs QWs were investigated, lattice-matched (LM), compressively-strained (CS) and tensile-strained (TS). Based on Photoluminescence results, the atomic intermixing between the quantum well and the barrier regions enhanced when the samples were coated with SiO2 layers. Although TiO2 layers were able to suppress the intermixing in InGaAs/InP system, the suppression was not significant compared to the AlGaAs/GaAs system. Based on a fitting procedure that was deconvoluted from the photoluminescence spectra including theoretical modeling, the electron-heavy hole and electron-light hole transitions were identified and a ratio of the group V to the group III diffusion coefficients (k) were obtained. The k ratio of the InGaAs/InP samples capped with SiO2 is relatively larger than of samples capped with TiO2 layers. ]]>
<![CDATA[Cytotoxicity Effect of Methanolic Extract of Buni’s Fruits (Antidesma bunius (L) Spreng) against Hela Cells ]]>
<![CDATA[Endah Puspitasari]]>
<![CDATA[ Jurnal ILMU DASAR Vol 10 No 2 (2009) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[ Antidesma bunius (L) Spreng., also known as buni, has traditionally been used as hypoglycemic, anemia, siphilis and anticancer materials. Buni contains alkaloid, saponin, flavonoid and tannin. The fruit extract of buni was tested for its biological activity using BST (Brine Shrimp Lethality Test). Result showed toxic effect of methanolic extract of fruit. In the present study, the fruit was extracted with methanol and then used for cytotoxicity test based on direct counting method against HeLa cell line. By probit analysis, it is known that the IC50 of the methanolic crude extract is 3.117 μg/ml. The lack of its IC50 is caused by the cytotoxic compound that is less extracted and there are many other compounds are extracted by methanol]]>
<![CDATA[A Prototype Fabrication of Sensitive Porous Silicon NOx (x=1,2) Gas Sensor ]]>
<![CDATA[Nyoman Sudiana]]>;
<![CDATA[Muhammad Anas]]>;
<![CDATA[Muhammad Jahiding Hafid]]>
<![CDATA[ Jurnal ILMU DASAR Vol 11 No 1 (2010) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[A prototype of (porous silicon (PS) based) NO(x=1.2) gas sensor based on porous silicon (PS) (operated at room temperature) has been fabricated. The sensor could be operated at room temperature. The (PS) basic material for the material sensor ( i.e. PS) was fabricated in the previous research by varying (parameter of the HF concentrations) concentrations of HF (what is HF?) and (the anodization time) time of anodizations. Its structure, as well as its optic, has been characterized. In this research, we did electrical characterization of PS to find its conductivity. The conductivity of PS is important because PS, as a sensor, utilizes the changes of conductivity when it is passed by NO(x=1.2). (The influence of these parameters on I-V characteristics of the PS and on the sensor performances has been studied in detail) The changes of electrical current because of the varying NO concentrations with time were measured using a current measuring system, then plotted. The result (shows) showed that the sensor could detect NO (and NO) gasses ranging from 16 ppb to 200 ppb and NO gas ranging from 12 ppb to 200 ppb, respectively at room temperature (28C) and at adjusted currents ranging from 20 to 800 μA. The result also showed that the sensor was not completely reversible for NO. xxx22ox ]]>
<![CDATA[Purification and Characterization of Antibacterial Protein from Pheretima javanica ]]>
<![CDATA[Joko Waluyo]]>;
<![CDATA[Bambang Sugiharto]]>;
<![CDATA[Noor Cholies Zaini]]>
<![CDATA[ Jurnal ILMU DASAR Vol 8 No 1 (2007) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[This research aimed to examine and isolate antibakterial protein from three species of earthworms has antibacterial potencies. The research was conducted in several stages, namely: extraction earthworm by using three kinds of solvents; antibacterial activity test of earthworm extract by agar diffusion method; purification of antibacterial protein by using DEAE chromatography, filtration column chromatography, and Native-PAGE. The results showed that three species of earthworms contained antibacterial protein. The activity of antibacterial protein extract of Pheretima javanica in MOPS buffer was highestand the inhibition zone diameter were10.0-14.0 mm. Compared to the other solven, the of MOPS buffer most precise for the solvent of protein. The extract of Pheretima javanica with MOPS solvent was fractionated by using DEAE chromatography (anion exchanger) and produced three peaks of protein group. Among the peaks, last peak that need 0.380 M NaCl to eluate performed antibacterial activity. Further fractionation of the protein by using gel filtration chromatography produced two peaks and one of the peak has antibacterial activity. Further purification that carried out by cutting the active fraction of second protein peak by using Native-PAGE produced seven bands. A single protein of the sixth band from lowest band showed antibacterial activity. ]]>
<![CDATA[Characterization of Crude Protease Bacillus sp 31 ]]>
<![CDATA[Esti Utarti]]>;
<![CDATA[Lina Nurita]]>;
<![CDATA[Sattya Arimurti]]>
<![CDATA[ Jurnal ILMU DASAR Vol 10 No 1 (2009) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[Bacillus sp 31 was bacteria which produce protease. Characterization of protease from Bacillus sp 31 i.e. pH, temperature, influence of metal ion, enzyme kinetic and enzyme termostability is important to get optimal enzyme activity. Protease activity showed values 146.40 U/ml on pH 9 and optimal temperature 60°C by value. Protease activity increased by addition of 159.50 U/ml Fe2+, but its activity decreased by addition of Mg2+, Cu2+, Ca2+, Al2+, Zn2+ dan Mn2+. Maximal velocity (Vmax) of enzyme-catalysed reactions was 21.32 U/ml with Km 1.5x10-3 mg/ml (Michaels-Menten Kinetic). Protease was very stable at 60°C for 4 hours of incubation and 7 hours of half-time.]]>
<![CDATA[Computer Simulation of Pouring Grains Using Stick-Slip Model ]]>
<![CDATA[Muhammad Hasan]]>
<![CDATA[ Jurnal ILMU DASAR Vol 9 No 2 (2008) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[We applied the Stick-Slip model to simulate pouring grains processes via Granular Dynamics Simulation. The dynamics mechanism and the structure formation of the 2D and 3D systems are investigated. The results show that the shape of the generated piles in the 2D and 3D systems are similar when observed superficially, but the detailed structure and the dynamic behaviour leading to that structure are very different.]]>
<![CDATA[Several Compounds Isolated from Stem Bark of Kedoya (Dysoxylum gaudichaudianum (A. Juss.) Miq.) (Meliaceae) ]]>
<![CDATA[Tukiran Tukiran]]>
<![CDATA[ Jurnal ILMU DASAR Vol 10 No 2 (2009) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[Several compounds, p-hydroxyacetophenone, b-sitosterol and stigmasterol had been isolated from hexane and chloroform extracts of stem bark of kedoya (Dysoxylum gaudichaudianum (A. Juss.) Miq.) (Meliaceae) respectively. These structures had been established based on spectroscopic data (IR and NMR) and by comparison with spectroscopic data of related compounds that had been reported.]]>
<![CDATA[Combinatorial Technology as a New Method for Chemical Processes ]]>
<![CDATA[Restu Kartiko Widi]]>;
<![CDATA[Sharifah bee Abdul Hamid]]>;
<![CDATA[Looi Mei Hong]]>
<![CDATA[ Jurnal ILMU DASAR Vol 10 No 1 (2009) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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<![CDATA[The ultimate goal approach to combinatorial catalysis taken in this research is from an academic perspective where the main objective is to accelerate the discovery of catalytic phenomena, i.e. new catalytic materials and catalytic processes, constrained by limited equipment and human resources. A commercially synthesis robotic workstation is used for automated parallel preparation of catalyst libraries, which is able to reproduce a conventional catalyst preparation method used routinely in laboratory, thereby increasing significantly the number of catalysts that can be prepared at once. The aim of this work is to produce libraries of catalysts based on this type of system to be tested and optimized by using the high throughput screening reactors and the selected catalysts are characterized to understand the structural properties. The 12 parallel reactors allows a proper catalyst testing, under more realistic conditions than in conventional combinatorial techniques, especially when the catalyst stage is advanced and quantitative data is required.]]>
