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Jurnal Matematika Sains dan Teknologi

JMST
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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. 2 (2009)" : 6 Documents clear

MODEL DISTRIBUSI BAHAN AJAR UNIVERSITAS TERBUKA DAN IMPLEMENTASINYA Sitta Alief Farihati; Amril Aman; Settings I. N. Kutha Ardana
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 2 (2009)
Publisher : LPPM Universitas Terbuka

Universitas Terbuka (UT) was implementing the centralized distribution of learning material, it is not considered efficient. Therefore, the decentralized distribution system which requires warehouses at certain regional offices will be proposed. The aims of this research are (1) investigating the decentralized learning material distribution model, (2) choosing the optimal location of warehouses to minimize the cost of learning material distribution, (3) choosing the regional offices which will be served optimally by each warehouse, (4) comparing efficiency of the centralized and decentralized learning material distribution system. The distribution problem is modeled as a linear mixed integer programming problem. The model will be solved using Branch and Bound method. This study considers centralized learning material distribution system and two alternative of decentralized learning material distribution systems, which are alternative 1 and alternative 2. It is found that in 2008 the cost of the alternative 2 is lower than the centralized learning distribution system. Besides, if the demand of learning material is increasing, the alternative 2 is still less costly than the other systems.

PENGARUH PEMBERIAN KOMBINASI PUPUK MAJEMUK NPK (25:7:7) DAN NPK KEMASAN (10:55:10) TERHADAP PERTUMBUHAN VEGETATIF TANAMAN KAMBOJA JEPANG (ADENIUM OBESUM) Susi Sulistiana
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 2 (2009)
Publisher : LPPM Universitas Terbuka

The objectives of this research were (i) to identify the effects of combination of compound fertilizers of NPK (25:7:7) and package NPK (10:55:10) on vegetative growth Adenium obesum in stead of Japanese frangipani plant, and (ii) to obtain the best combination of dose of NPK (25:7:7) and package NPK (10:55:10) in order to improve plant vegetative growth of Adenium obesum. This experiment was conducted in employed completely random design with factorial pattern of 4 and three times repetition. Factor I, the dose of NPK (25:7:7) fertilizer in 4 levels of dose : 0.0 g/L; 0.5 g/L; 1.0 g/L; and 1.5 g/L. Meanwhile, Factor II, the dose of package NPK (10:55:10) was applied with 4 levels of dose : 0.0 g/L; 0.5 g/L; 1.0 g/L; and 1.5 g/L. The data obtained were analyzed using variance analysis (ANOVA) technique to identify the influence of the treatment towards variables measured and mean separation was evaluated using DMRT with 5% level of difference. The results show that the use of combination of compound fertilizers NPK (25:7:7) and package NPK (10:55:10) improves plant vegetative growth of Adenium obesum. However, the use of combination of NPK 0.0 g/L and package NPK 0.5 g/L shows unsatisafactory results. The combination of NPK 1.5 g/L and package NPK 1.5 g/L provides the best result in improving plant vegetative growth of Adenium obesum.

PENGARUH PEMBERIAN BISA NAJA SPUTATRIX TERHADAP KADAR INTERLEUKIN-2 SERUM DARAH MENCIT YANG DIINDUKSI BENZO(A)PYRENE Gina Anindyajati; Bambang Budiono
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 2 (2009)
Publisher : LPPM Universitas Terbuka

Cancer has become a global health problem arisen from exposure to benzo(a)pyrene. Interleukin-2 is one of immune system components believed to play roles in eradicating cancer. Cobra venom has antitumor effect and also contain protease which could boost up immune system. This research was aimed at analyzing Naja sputatrix venoms effect to increase interleukin-2 level in blood sera of mice induced by benzo(a)pyrene. Four group of Balb-C mice were used. The first group (control) and second group (treatment with Naja sputatrix venom) consist of 5 mices. There are 6 mices used in group 3 and 4, both were injected intramuscularly by benzo(a)pyrene (0,3L/0,01mL oleum oil) at day 1, 8 and 15. Three months after, observation was carried out to see changes occured in their liver and lungs. Naja sputatrix venom 0,1 mL (diluted in saline 1:100) was given to group 2 and 4 for 30 days. Blood was collected from all groups and centrifuge to form sera. Level of interleukin-2 in sera was measured by ELISA method. The results show that Group 2 has the highest mean level of interleukin-2 (136,837 pg/mL), and group 3 has the lowest (8,996 pg/mL). Level of interleukin-2 in group 4 is slightly higher than group 3 (10,632 pg/mL). Kruskal-Wallis analysis result come with Sig. 0,155; therefore shows no significance(p>0,05). It is therefore concluded that Naja sputatrix venom do not increase interleukin-2 level in blood sera of mice induced by benzo(a)pyrene

PENERAPAN BIOTEKNOLOGI DALAM EKSTRAKSI MINYAK KELAPA DENGAN MENGGUNAKAN KHAMIR ROTI (Saccharomyces cerevisiae) Leta
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 2 (2009)
Publisher : LPPM Universitas Terbuka

This research is aimed for knowing the influence of temperature, pH, and their interaction on the amount and quality of oils formed in fermentative extraction of coconut oil using bakers, yeast the treatment examined temperature divided into four treatments, pH divided into two treatments, and three repetitions. All treatment in this research met SII. The research result show that: (1) Treatment of temperatures give different effects on the amount of oils, temperatures of 350C and 300C produced the highest amount of oil, give different effects on water content, temperatures of 300C and 350C resulted in the lowest amount of water content, gave different effect on iodine number, and on lathering number, temperature of 350C resulted in the lowest number, did not give different effects on the level of free-fats acid. (2) Treatment of pH did not give different effect on the amount of oil, on water content but give different effect on iodine number, on lathering number, pH of 4 was lower the pH of 4.5. (3) Interaction of treatments of temperatures and pHs give different effect on the amount of oil, temperatures of 350C with pH of 4 and temperatures of 300C with pH 4 produced highest amount of oil, give different effect on water content, temperature of 300C with the pH of 4.5 resulted in the lowest amount of water content, the temperature of 250C with pH 4.5 produced high water content (0.55%), temperature 300C with pH 4.5 resulted in the lowest peroxide number. It gives different effect on the content of free fats acid, produced oil whit bright colour, good taste and smell and it was not immediately rancid.

PEMODELAN FLUKTUASI MUKA AIR TANAH UNTUK MENDUKUNG PENGELOLAAN AIR PADA PERTANIAN LAHAN RAWA PASANG SURUT TIPE A/B Ngudiantoro; Hidayat Pawitan; Muhammad Ardiansyah; M Yanuar J. Purwanto; Settings Robiyanto H. Susanto
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 2 (2009)
Publisher : LPPM Universitas Terbuka

The objectives of this research are to develop a model of water table fluctuation on tidal lowland area of A/B type. The results of the research are expected to support of the agricultural development on tidal lowland area, especially on water management, because the water management play an important role in the agricultural on tidal lowland area. The water table on tidal lowland area fluctuates according to space and time. The water table controls at a certain depth can support the plant growth and the pyrite oxidation restraint. The model of water table fluctuation which is developed in this research based on the ellipse concept. The research was conducted on the reclamation area of tidal lowland at the fourth tertiary block in P8-12S Delta Telang I, Banyuasin district, South Sumatra province. The simulations of model show good result of estimating the depth of water table on tidal lowland area of A/B type. The proportion of variation the depth of water table which can be explained by model that is 89,6% up to 95,5% with standard error of the estimate is 0,021-0,035 meters. The parameter of the water level in the tertiary canals has high sensitivity to the model.

PERSISTENT ORGANIC POLLUTANS (POPS) DAN KONVENSI STOCKHOLM Lina Warlina
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 2 (2009)
Publisher : LPPM Universitas Terbuka

Persistent organic pollutants (POPs) are toxic chemicals that adversely affect human health and the environment around the world. Because they can be transported by wind and water, most POPs generated in one country can affect people and wildlife far from where they are used and released. They persist for long periods of time in the environment and can accumulate and pass from one species to the next through the food chain. To address this global concern, many countries in the world joined forces with 90 other countries and the European Community to sign a groundbreaking United Nations treaty in Stockholm, Sweden, in May 2001, known as the Stockholm Convention. One of important agreement is all countries agreed to reduce or eliminate the production, use, and/or release of 12 key POPs. The Convention specifies a scientific review process that could lead to the addition of other POPs chemicals of global concern. POPs include a range of substances that include intentionally produced chemicals currently or once used in agriculture, disease control, manufacturing, or industrial processes. Also it can be produced by unintentionally produced chemicals, such as dioxins, that result from some industrial processes and from combustion (for example, municipal and medical waste incineration and backyard burning of trash).

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