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Jurnal Matematika Sains dan Teknologi

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Published by Universitas Terbuka

ISSN : 14111934 EISSN : 24429147 DOI : -

Core Subject : Education, Agriculture,

Agriculture, Biological Sciences & Forestry Mathematics Other

Merupakan media informasi dan komunikasi para praktisi, peneliti, dan akademisi yang berkecimpung dan menaruh minat serta perhatian pada pengembangan Matematika, ilmu pengetahuan dan teknologi. Diterbitkan oleh Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Terbuka.

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Articles 6 Documents

Search results for , issue "Vol. 10 No. 1 (2009)" : 6 Documents clear

HUBUNGAN MATRIKS AB DAN BA PADA STRUKTUR JORDAN NILPOTEN Sondang Purnamasari Pakpahan; Elvina Herawaty
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

In this paper, we give another proof about the relationship between AB and BA with eigenvalue zero that reduced by structure Jordan for nilpoten matrix

EFEKTIVITAS VARIABEL MEDIATOR BERDASARKAN KONTRIBUSINYA DALAM MODEL MEDIASI SEDERHANA Deddy A Suhardi; Settings Isfarudi Isfarudi
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

Structurally relationship of variables is important in deeply analysis of path models, but the process of effect distribution must be concerned. In this situation, one or more variable would be a mediator variable which assessing effect of an independent to a dependent variable. We studied the simple mediation model that is one of path analytical models which contain of one independent variable, dependent variable and mediator variable. A necessary component of mediation is effectiveness that is a statistically significant indirect effect, formal significance tests of indirect effects are early conducted by Sobel (1982). According to sequential regression analysis on a simple mediation model, a mediator variable come after an independent variable exist in the model, the contribution of upcoming variable to the model could be obtained. We argue the importance of investigating empirical relationship between the significance of indirect effects and sequential contribution of mediator variable with a normal theory approach using Microsoft Excel simulation tools developed by Myerson (2000). We find that the higher contribution of mediator variable to the model, the more effectiveness is. This result comes up with three level correlation of independent and dependent variable which each 1000 times iteration that gives relatively immediate information about the recent empirical relationship between the significance of indirect effects and sequential contribution of mediator in the simple mediation models.

PENGARUH ORGANIC SOIL TREATMENT (OST) DAN SELANG WAKTU APLIKASI LARUTAN LANDETO TERHADAP HASIL BAWANG MERAH PADA REGOSOL Settings Jeanne I Nendissa; Nonce Wattimena
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

This research was intended to determine the rate of Organic Soil Treatment (OST) and the interval of application of Landeto solution or their interaction on the growth of shallots grown in the regosol soil. This research was conducted in the green house of Departement of Soil Science, Faculty of Agriculture Gadjah Mada University. A Randomized Complete Block Design, employing a factorial treatment was chosen. The first factors was rates of OST, i.e,: 0, 3, 6, 9 and 12 ton ha?. The second factors was interval of application of Landeto Solution, i.e, : 3, 5 and 7 days. The combination treatments were repeated 3 times. Results of the research showed that; 1) Intermedien between rates of OST at 6 ton ha? and interval of application of Landeto solution ot 5 days, was found in bulb number per hills ( 29.87, cm2 ) respectively. 2) Application of OST, at 6 ton ha? had a significant effect on the plant fresh weight and the fresh bulb weigth, 3) Application of Landeto solution at different intervals had no significant effect on all components and crop yield.

ISOLASI DAN IDENTIFIKASI BAKTERI PEREDUKSI SULFAT PADA AREA PERTAMBANGAN BATU BARA MUARA ENIM, SUMATERA SELATAN Muchamad Yusron; Bibiana W Lay; Anas M Fauzi; Dwi Andreas Santosa
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

Sulfate reducing bacteria utilize sulfate as their terminal electron acceptor and reduce it to sulphide. Acid mine drainage, by-products of mining activities, is an acidic sulfate-rich wastewater suitable habitat for sulfate reducing bacteria. Isolation and identification of sulfate reducing bacteria collected from Muara Enim coal mining, South Sumatra was carried out at Laboratory of Environmental Biotechnology, Indonesian Center for Biodiversity and Biotechnology (ICBB), Bogor, and Laboratory of Microbiology, Faculty of Veterinary, Bogor Agricultural University. Postgate B liquid media was used for isolation and purification via serial dilution. Physiological and biochemical characterization was done based on Bergeys Manual of Determinative Bacteriology. Fifteen pure isolates have been isolated with diverse characteristics. Eight isolates can sustain at pH 3, while the rest sustain at pH 4 or above. Sulfate reduction efficiency of each isolates were different, but increased as the pH increased. The bacteria are classified as Desulfovibrio sp., which is characterized straight rods, motile, non spore-forming and able to grow in simple organic carbon.

KERAGAAN MUTU BIJI KAKAO KERING DAN PRODUK SETENGAH JADI COKELAT PADA BERBAGAI TINGKATAN FERMENTASI Dian Adi A. Elisabeth; Ludivica Endang Setijorini
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

Basic of cocoa bean preparation process is fermentation. Fermentation is done especially to improve and build specific chocolate flavour of cocoa bean and its products, i. e. cocoa liquor, butter, and powder; and also to decrease the disliked flavors, like bitter and acid. Research of cocoa bean fermentation was hold on in Subak Abian Pucaksari, Tabanan. This research involved 20 cooperative farmers with 0,5 hectare farm area per each farmer. The treatment used was time of cocoa bean fermentation, i.e. without fermentation, not fully fermentation (4 days), and fully fermentation (5 days). Variables observed were dried cocoa beans physic and chemical quality, and also cocoa products chemical and organoleptic quality. Organoleptic test done to cocoa liquor and powder was descriptive and ranking test used 15 semi-trained panelists. The result showed that the fermentation process had significant influence to dried cocoa beans chemical quality and its products. Fermentation had no significant influence to dried cocoa beans physic quality. For organoleptic quality attributes, all panelists gave the highest rank for cocoa liquor and powder prepared from fully fermented cocoa bean.

STUDI AWAL PENGEMBANGAN JARINGAN INKUBATOR TEKNOLOGI & BISNIS PADA INSTITUSI PENDIDIKAN TINGGI DI INDONESIA W Widayat; Settings Irawadi Jamaran
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

Partnership development and technology business incubator on the basis of mutual interests will require more real if developed until the stage of commercialization of technological innovation in the markerplace. The partnership is based on sharing information, experiences and resources between hinger education institutions, research institutions and the community. It is expected that such partership will preduce new business organization that comes from new ideas and new entrepreneurs. In this paper the initial design model is given as networks center college of growth in the form of partnership networks of higher education institutions and research institutions that support the development needs of the community business organizations through technology and business incubators.

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