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Jurnal Ilmu Dasar
Published by Universitas Jember
ISSN : 24425613     EISSN : -     DOI : https://doi.org/10.19184/jid.v24i2.36657
Core Subject : Education, Engineering,
Control & Systems Engineering Mathematics
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.
Arjuna Subject : Matematika - Kontrol dan Optimasi
Articles 415 Documents
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Study of Phosphate Compounds in Sediment and Water Using Diffusive Gradient in Thin Films (DGT) Technique Barlah Rumhayati
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The algae blooming, which is well known as eutrophication, becomes major problem for most water systemsaround the world. Even though orthophosphate caused eutrophication has been removed, eutrophication couldstill occur seasonally due to the act of sediment as a source and sink of phosphate compounds. Foreutrophication monitoring, the needs of information of concentration and type of phosphates species areimportant. To minimize contamination and to gain better understanding of sediment-water interaction, the in situtechnique of DGT has been used for determining the concentration and species of phosphates in sediment andoverlying water. The results showed that the concentrations of FRP and FOP in sediment approximately were 3mg/L and 0.5 mg/L, respectively. Under anoxic condition, phosphates could be released from sediment anddiffused into overlying water which was shown by relatively high concentration of phosphates in overlyingwater. Mineralization of FOP has occurred under anoxic condition which was agreed with an increase of FRP atdepth of sediment. The residue of refractory organic phosphates species were detected at depth sediments alongwith the end group of polyphosphate at deeper sediment. By understanding the role of sediment, its interactionwith overlying water and determining the phosphates concentration and species, eutrophication could becontrolled.
Laser Induced Fluorescence Spectroscopy of Atoms in a Hollow Cathode Discharge Lamp Agung Bambang Setio Utomo; Hans Helmut Telle
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

It has been demonstrated in this work that commercial hollow cathode discharge lamps can be used for LaserInduced Fluorescence technique by sending the laser beam into the cathode discharge lamp. Experiments havebeen performed using a single mode diode laser to investigate selected lines of argon (~772 nm). After resonantlaser excitation on a certain transition, most of the other lines in the spectrum change their intensities in the LIFexperiment. The highest intensity increment is observed for the wavelengths which originate from the sameexcited level (2p7) as the one accessed by the pumping radiation. Further very strong intensity changes areobserved for transitions from the excited levels nearest to the pumping level, obviously due to collisional transferprocesses.
Screening of Genomic Library of Soybean Cultivar Lumut by Using Peroxidase Gene from Arabidopsis thaliana as Probe Suharsono Suharsono; Teguh Juliyanto; Muhammad Jusuf
Jurnal ILMU DASAR Vol 11 No 1 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Screening to genomic library of soybean cv. Lumut by using gene encoding for peroxidase (per) from A. thaliana as a probe has an objective isolate the whole gene of per from soybean. The probe was labeled by non-radioisotope alkalin phosphatase. Screening was done by two steps. The first, screening was done to 105 recombinant lambda phages containing genome of soybean cv. Lumut. After southern hybridization, positive signal of plaques were isolated and screened for the second time. After second screening, some recombinant lambda phages containing putatively per genes were isolated. Excision from recombinant lambda phages into recombinant plasmid was successfully done in Escherichia coli strain BM25.8. The plasmid DNAs were isolated from E. coli strain BM25.8 and introduced into E. coli strain DH5α for multiplication. Plasmid DNAs were digested by EcoRI and transferred onto nylon membrane hybond N+. Southern hybridization analysis showed that one clone, L10/R/3/4, contain per gene in the 7.7 kb EcoRI fragment. This fragment is inserted into pSportI. 
Probit Model on Multivariate Binary Response Using Simulated Maximum Likelihood Estimator Jaka Nugraha; suryo Guritno; Sri Haryatmi
Jurnal ILMU DASAR Vol 11 No 1 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

In this paper, we discuss probit model on multivariate binary response. We assume that each of n individuals is observed in T responses. Yit is tth response on ith individual/subject and each response is binary. Each subject has covariate Xi (individual characteristic) and covariate Zijt (characteristic of alternative j). Response on individual ith can be represented by Yi = (Yi1,....,YiT), Yit is tth response on ith individual/subject and each response is multinomial. In order to simplify, we choose one of individual characteristics and alternative characteristics. We use simulated maximum likelihood estimator (SMLE) methods to estimate the parameter based on Geweke-Hajivassiliou-Keane (GHK) simulator. We find the first derivative of likelihood function for multivariate binary probit. Then, we expand to multivariate multinomial response. The first derivative is used in the BHHH (Berndt, Hall, Hall, Hausman) iteration to obtain estimators. 
The Dynamic Population of the Bacterial Hydrocarbonoclastic Concorsium in the Crude Oil Sludge Degradation Astri Nugroho
Jurnal ILMU DASAR Vol 8 No 1 (2007)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Experiment in laboratory scale has been carried out to study population dynamic of the bacterial hydrocarbonoclastic consorsium in the crude oil sludge degradation being mixed with NPK fertilizer as nitrogen resources. Aerobic test was carried out by putting erlenmeyers in a shaker incubator, 120 rpm shaking speed, at 50°C temperature. During15 days in laboratory scale observation showed that the consortium has the potential to grow up to 50% (v/v) sludge oil load. Maximum growth and maximum growth rate of the consortium in liquid media occurred in the III C treatment (by adding 50% (v/v) sludge oil and by mixing nitrogen in the form of NPK fertilizer amounting 30% (w/v) of added substrat. At the end of the study 7 species of bacteria were identified, 5 of them are of Bacillus sp, which are aerobical. During degradation process, consorsium growths fluctuativelly. There is spesific process to degrade complex substrat by consortium bacteria.. Specifically, this experiment informs that bacterial consortium degradator of crude oil sludge are more efective than monoculture bacterial. Crude oil consists of complex hydrocarbon, in the other hand for each spesies bacteria has spesific enzyme which work on spesific substrat. They only have limited ability. Each bacteria of its corsorsium has dominated the consorsium which is able to use hydrocarbon fraction.
Antioxidant Activity Assay of Dragon Fruit Extract (Hylocereus undatus (Haw.) Britt. & Rose Evi Umayah U; Moch Amrun H
Jurnal ILMU DASAR Vol 8 No 1 (2007)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Dragon fruit (Hylocereus undatus (Haw.) Britt. & Rose) familia Cactaceae has been cultivated for its beneficial properties on lowering both blood’s cholesterol and glucose level which were related with free radical-antioxidant mechanism. The fruits content antioxidants compound such as vitamin C, caroten, betacyanin pigments dan phenol; therefore it is necessary to determine its antioxidant activity. In this study, the antioxidant activity was performed on both methanolic and water extracts of dragon fruit (planted in Rembangan-Jember area) using diphenyl picryl hydrazil hydrate (DPPH) as stable free radical in spectrophotometric methods. The result showed that both methanolic and water extract exhibits DPPH free radical scavenger as an antioxidant activity with EC50 value sequentially 1.08 % and 2.98 %.Keywords : dragon fruit, Hylocereus undatus (Haw.) Britt. & Rose, free radical, DPPH, EC50.
Embedding Cycle Graphs Complements Liliek Susilowati; Hendy Hendy; Yayuk Wayuni
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

A graph is embeddable on a surface if it can be drawn on that surface without any edges intersect. The cycle graphs can always be embedded on the plane and the torus, but this is not occurred for their complements. We prove that the maximum order of cycle graphs such that their complements still can be embedded on the plane is 6. But, the maximum order of cycle graphs such that their complements still can be embedded on the torus is 9. Also, the crossing number of complements of cycle graphs which can’t be embedded on the plane with minimum order will be presented.
Application of Tree Regression in Long Study of University of Jember‘s Student Use R Program Yuliani Setia Dewi
Jurnal ILMU DASAR Vol 8 No 1 (2007)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

This research aimed to implemate tree  regression with one respon and six explanatory variables in R programand apply it to know variables which distinguish long study of University of Jember’ student. We can use “tree”function to form tree regression in R.  The result of  research shows that the rate of long study University ofJember’s Student is 1802 days. Based on structure of tree we can know that variables can used to distinguishuniversity of Jember’s students in long study are GPA, time used for doing minithesis and faculty Fromimplementation of tree regression,it is known that tree regression can identify variables locally, revealinteractions in the data set, no variable is assumed to follow any kind of statistical distribution and easy tointerpret. Keywords : tree regression, R program , tree function, long study
The Determination of Bedrock Depth Using Seismic Refraction Method in Kemuning Lor Village, Sub District of Arjasa, Jember Nurul Priyantari; Agus Supriyanto
Jurnal ILMU DASAR Vol 10 No 1 (2009)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

A research has been done using seismic refraction method to determine the depth of bedrock in the Village of Kemuning Lor, sub district of Arjasa, Jember. The Data acquisition was done by using 12 geophones and using weight drop vibrations sources. The distance between the vibration source and the first geophone is 10 meters away, while the distance among geophones is 2 meter away each. This Data acquisitions used two tracks (the first track was about 90 meters and the second track was about 40 meters). The first and second track were crossing each other, the first track lied from the main road to crevasse, while the second track lied in line with the crevasse. The result was that we were able to obtain three layers having the depth of 3,03-6,76 m; 4,37-9,93 m and 10,68-13,32 m, and having spreading speed 168,9-198,8 m; 425,1-511,7 m and 909,1-972,2 m. The obtained bedrock profile had declivity toward the crevasse and is assumed to have the potential of soil movement.
Continum Regression with Discrete Wavelet Transformation Preprocessing Setiawan Setiawan; Khairil Anwar Notodiputro
Jurnal ILMU DASAR Vol 8 No 2 (2007)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

In the multiple regression modeling, serious problems will be occurred if  independent variables are correlated, to be named  ill conditioned problem, and the number of observations is much less than the number of independent variables, it is a singularity problem. Continum Regression (CR) approach, it’s better to overcome the problem of ill conditioned, but if  the number of observations is much less than the number of independent variables usually facing the problem in computing. So the first step, it needes dimension reduction of independent variables (known as a preprocessing method). Discrete wavelet transformation (DWT) is one of a good method handle the problem of singularity.  The research we have studied  combination of CR and DWT as a preprocessing method can solved the problems of ill conditioned and singularity.  The result of empirical research with simulation data has concluded that performance of CRDWT have very good potency to overcome the problems of the number of observations much less than the number of independent variables and ill conditioned.

Page 16 of 42 | Total Record : 415

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