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INDONESIA
Jurnal ILMU DASAR
Published by Universitas Jember
ISSN : 14115735     EISSN : 24425613     DOI : -
Core Subject : Science, Education,
Jurnal ILMU DASAR (JID) adalah jurnal ilmiah yang melingkupi bidang matematika, fisika, kimia dan biologi. Naskah yang diusulkan untuk diterbitkan Jurnal Ilmu Dasar adalah naskah yang belum pernah diterbitkan dan atau tidak sedang dipertimbangkan penerbitannya di majalah lain. Jurnal Ilmu Dasar menerima tulisan hasil penelitian dasar (bukan aplikasi) untuk bidang matematika, kimia, fisika, dan biologi. Naskah ilmiah ditulis dalam bahasa Indonesia atau dalam bahasa Inggris yang baik. Secara lebih detail dapat dilihat dari pedoman penulisan.
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Articles 16 Documents
Search results for , issue "Vol 11 No 2 (2010)" : 16 Documents clear
Similarity for Binary Data Based on the Value of Entropy and Structure Patterns Categories Kariyam, Kariyam
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

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.
Pd Seed Under-layer Effect on Coercive Field of Perpendicularly Magnetized Co/Pd Multilayer Films Purnama, Budi
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Coercive field, Hc dependence of Pd seed under layer has been investigated for Co/Pd multilayer with perpendicular anisotropy magnetic. Structured Co/Pd multilayer fabricated by DC sputtering machine on glass substrate. Results indicated that Pd seed under layer of 50Ã… thicknesses successfully increased Hc from 800Oe to 1600Oe. The results could be related to the Co/Pd multilayered grain to grow separately leading exchange de-coupling effect, beside the increase of surface interaction.
Optimum Simplex Lattice Designs of Low Order Multiresponse Surface Model by D-Optimum Criterion Ruslan, Ruslan; Linuwih, Susanti; Purhadi, Purhadi; S, Sony
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Simplex lattice design is a part of mixture designs has patterns simplex {q, m} where q is number of factors andm is degree of polynomial. If entangling a number of the response variables which measured from a number offactors called the multiresponse surface model, hence to obtain get the matrix designs of optimum mixture atmultiresponse surface model will be used by the optimum-D criterion. In this research, we studied abouttheoretical approach to get optimum simplex lattice design of low order multiresponse surface model byoptimum-D criterion. We assumed that design points have similar weighted values.
CPO Bleaching Optimization Using Activated Charcoal And Bentonite Abdullah, A; Abdi Atmanegara, Yudhistira; Nurmasari, Radna
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Research of Crude Palm Oil (CPO) bleaching optimization using activated charcoal and bentonite on biodiesel synthesize had been done. The aim of this research is to find optimum condition of bleaching process, by making variation of activated charcoal and bentonite ratio as adsorbent (1:0, 1:10, 1:15, 1:20 and 0:1), temperature (non heated, 40-50oC, 60-70oC, 80-90oC and 100-110oC) and time (1; 1,5; 2; 2,5 and 3 hours). The results of this research will be used as optimal conditions for synthesizing biodiesel. Optimum condition was determined by observing the lowest absorbent which was measured by using spectronic-20 on 445 nm. Results showed that optimum activated charcoal and bentonite adsorbent ratio was 0:1, optimum temperature was 100- 110oC and optimum time was 3 hours.
Composition Of Mangrove Species On Ngurah Rai Mangrove Forest Pemogan Village, Denpasar Selatan District, Denpasar Municipality, Bali Province Darmadi, Anak Agung Ketut; Ardhana, I Putu Gde
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The research on analysis of composition of mangrove forest vegetation is a fundamental that can be used toutilize mangrove forest. The research was carried out at Ngurah Rai Mangrove forest, Pemogan village,Denpasar Selatan district, Denpasar Municipality, Bali province be using systematic plot sampling method. Theresearch result showed that there are seven kinds of mangrove tree found, such as Soneratia alba (L.) Blanco,Rhizophora apiculata BL., Avicennia alba Blume, Bruguiera gymnorrhiza (L.) Lamk., Xylocarpusmoluccensis (Lam.) M. Roem., Aegiceras corniculatum (L.) Blanco, and Ceriops tagal (Perr.) C.B. Robinson.Number of S. alba (L.) Blanco growth increase from sea to land. The highest important value was found in S.alba (L.) Blanco.
Predicting Interval of Product Reliability With Bootsrap Percentile Method Fauzy, Akhmad; Supandi, Epha Diana
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

In this article, two methods are proposed to give the interval estimation for reliability function from a product. Reliability function is a probability of an individual (product) surviving till time t. Some resecearchers usually use traditional method to construct interval estimation. This interval needs an assumption that sample is exponentially distributed. This research applied another method, namely Bootstrap percentile. Bootstrap method is more potential in constructing interval estimation for reliability function from a product.
Laser Induced Fluorescence Spectroscopy of Atoms in a Hollow Cathode Discharge Lamp Utomo, Agung Bambang Setio; Telle, Hans Helmut
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.
Study of Phosphate Compounds in Sediment and Water Using Diffusive Gradient in Thin Films (DGT) Technique Rumhayati, Barlah
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.
Insecticidal Bufadienolides from The Leaves of Kalanchoe daigremontiana (Crassulaceae) Hermawan, Wawan; Maharani, Rani; Fajriah, Sofa; Hardiawan, Revan; Supratman, Unang
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Kalanchoe is the biggest genera of Crassulaceae family and distributed in tropical and subtropical regions. This genera is found to be a rich source of biologically active natural products such as triterpenes, flavonoids and steroids. As a part of our continuing search for novel insecticidal compounds from Indonesian Kalanchoe plants, we examined Kalanchoe daigremontiana collected from Bandung region, West Java, Indonesia. The methanolic extract of the dried leaves of K. daigremontiana was concentrated and extracted with methylene chloride The methylene chloride extract exhibited an insecticidal activity toward silkworms. The methylene chloride extract was partitioned between n-hexane and methanol containing 10% water. The active lower layer was extracted with ethyl acetate. By using the insecticidal activity to follow the separations, the ethyl acetate fraction was separated by combination of column chromatography on Kieselgel 60 and ODS to afford two insecticidal bufadienolides 1 and 2. The structures of these compounds were elucidated based on spectroscopic analysis (UV, IR, NMR, 2D-NMR) and comparison with those related data previously reported. In this paper, the isolation, structural elucidation, and insecticidal activities against the third instar larvae of silkworm will be described.
Presence of Arbuscular Mycorrhizal Fungi in Coastal Forest Based on The Salinity Gradients Delvian, D
Jurnal ILMU DASAR Vol 11 No 2 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The role of arbuscular mycorrhizal fungi is very important in a coastal area with sandy soil, high salinity level and low available of phosphate. However, the salinity levels also affect the diversity and activities of mycorrhizal fungi. This research was aimed to learn about arbuscular mycorrhizal fungi in coastal forest based on the salinity gradients. The results demonstrated that spore density and percentage of mycorrhizal colonization decreased by increasing the soil salinity. The same effect was also showed on the observed spore types. Glomus was found as the dominant spore in the research area.

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