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INDONESIA
Jurnal Matematika Sains dan Teknologi
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.
Arjuna Subject : -
Articles 403 Documents
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PENENTUAN BESARNYA ANUITAS HIDUP DENGAN MENGGUNAKAN NILAI ASUMSI PADA DISTRIBUSI SISA USIA Farah Kristiani
Jurnal Matematika Sains dan Teknologi Vol. 11 No. 2 (2010)
Publisher : LPPM Universitas Terbuka

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Abstract

There are two kinds of annuity, annuity certain and life annuity. Annuity certain does not depend on life probability, for example, mortgage. Life annuity depends on time until death and life probability, for example, pension payment from insurance company. The objective of this paper is to discuss further about life annuity and the relationship with life probability that is influences by time until death and the assumption of interest which is used. Time until death (T) is a random variable, because it is unpredictable. To determine the value of distribution, assumption values on tqx will be used. These values are generated by T simulation which depends on Uniform distribution (0,1) random values. A few cases of determining life annuity using tpx distribution values by T simulation will be discussed.
SINTESIS BAHAN UBAHAN GRADUAL ALUMINUM TITANAT/KORUNDUM DARI ALUMINA TRANSISI DENGAN PENAMBAHAN MgO Fauzi, Achmad Sulhan; Pratapa, Suminar; Eko Santoso, Mohammad Herman
Jurnal Matematika Sains dan Teknologi Vol 13 No 2 (2012)
Publisher : LPPM Universitas Terbuka

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Abstract

This article describes the results of research on the use of transition alumina for improving the performance of ceramics. Synthesis has been made of gradual changes materials (Functionally Graded Materials, FGM) aluminum titanate (AT) / corundum based on transition alumina powders with the addition of MgO as a stabilizer of AT as much as 2 wt.%. Samples without the addition of MgO was also made for comparison. Transition alumina with and without the addition of MgO were calcined at a temperature of 1100C for 1 hour to become ?-alumina. The powder mixture was compacted at a pressure of 49.3 MPa and then prasintered at a temperature of 1100C for 1 hour, then repeatedly infiltrated with infiltrator TiCl3 solution (20%) which prepared by dissolving the Ti metal powders into HCl. Furthermore, the material sintered at temperatures of 1500C with a holding time for 3 hours. Physical character of materials showed an increase in density and decrease in porosity of the material due to the addition of MgO. Phase identification results obtained from the content of AT and corundum phases which gradual in depth, indicating that FGM has been formed. These results were supported by analysis of x-ray diffraction pattern showing the formation of a solid solution Al2 (1-x) + MgxTi1 xO5 which marked by the shifting of the peak of AT phase in FGM samples with the addition of MgO. Tulisan ini menjelaskan hasil penelitian tentang penggunaan alumina transisi untuk meningkatkan performa keramik. Telah dilakukan sintesis bahan ubahan gradual (Functionally Graded Material, FGM) aluminum titanat (AT)/korundum berbahan dasar serbuk alumina transisi dengan penambahan MgO sebagai penstabil AT sebanyak 2 wt.%. Sampel tanpa tambahan MgO juga dibuat sebagai pembanding. Alumina transisi dengan dan tanpa penambahan MgO dikalsinasi pada temperatur 1100C selama 1 jam sehingga menjadi ?-alumina. Serbuk campuran dikompaksi pada tekanan 49,3 MPa lalu diprasinter pada temperatur 1100C selama 1 jam, kemudian diinfiltrasi secara berulang dengan infiltran larutan TiCl3 (20%) yang dibuat dengan cara melarutkan serbuk logam Ti ke dalam HCl. Selanjutnya bahan disinter pada temperatur 1500C dengan holding time selama 3 jam. Karakterisasi fisik bahan memperlihatkan adanya kenaikan densitas dan penurunan porositas bahan akibat penambahan MgO. Dari hasil identifikasi fasa didapatkan kandungan fasa AT dan korundum yang gradual terhadap kedalaman, menunjukkan bahwa FGM telah terbentuk. Hasil ini didukung dengan analisis pada pola difraksi sinar-x yang memperlihatkan terbentuknya larutan padat Al2(1-x)MgxTi1+xO5 yang ditandai terjadinya pergeseran puncak fasa AT pada sampel FGM dengan penambahan MgO.
ANALISIS BEBERAPA ASPEK REPRODUKSI KEPITING BAKAU (SCYLLA SERRATA) DI PERAIRAN SEGARA ANAKAN, KABUPATEN CILACAP, JAWA TENGAH Asmara, Hadun; Riani, Etty; Susanto, Agus
Jurnal Matematika Sains dan Teknologi Vol 12 No 1 (2011)
Publisher : LPPM Universitas Terbuka

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Research was done in Segara Anakan water lagoon, Cilacap District, Central Java, from September 2003 to November 2003. Samples of mangrove crab were taken using catching tool of wadong and pintur which setted in the afternoon and unsetted the next morning. From all samples collected, there were 55 male and 113 female crabs. The width range of male shells were 31.5-122.5 mm and weight range were 53.75-286.08 gram, while the females shells have width range of 78.4-120.5 mm and weight range of 69.38-229.08 gram. Fecundity of mangrove crabs (Scylla serrata) ranges between 345,923-1,472,639 eggs with mean value of 646.194. Diameter of the egg curve shows that the mangrove crabs were total spawner, which means totally discharge their eggs.
OPTIMALISASI FERMENTOR UNTUK PRODUKSI ETANOL DAN ANALISIS HASIL FERMENTASI MENGGUNAKAN GAS CHROMATOGRAFI Khak, Muhammad; Nuraini, Rini; Rohmatningsih, Rohmatningsih; ., Purwito
Jurnal Matematika Sains dan Teknologi Vol 15 No 1 (2014)
Publisher : LPPM Universitas Terbuka

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Produksi etanol dilakukan dengan beberapa perlakuan antara lain pengenceran larutan stok menjadi 4 variasi konsentrasi, penambahan nutrisi, pengaturan pH, sterilisasi bahan, pendinginan, penambahan inokulum Saccharomyces cerevisiae. Penelitian ini bertujuan mengoptimalisasi pemanfaatan fermentor dan Gas Chromatography untuk fermentasi etanol dan analisis hasilnya. Fermentasi dilakukan selama 96 jam dan pengambilan sampel dilakukan setiap 24 jam. Pengujian hasil fermentasi dilakukan dengan cara melakukan uji kadar alkohol metode conway, uji kadar alkohol metode GC setelah dilakukan pemekatan 5 kali dengan cara destilasi, uji gula dengan metode DNS untuk mengetahui sisa gula yang digunakan dalam fermentasi, uji TPC dan kekeruhan untuk mengetahui pertumbuhan sel Saccharomyces cerevisiae. Hasil uji dibuat grafik dan dianalisis menggunakan SPSS untuk mengetahui penambahan kadar alkohol tiap jam fermentasi, untuk mengetahui apakah data dianggap linier secara statistik dan untuk mengetahui berapa waktu optimal produksi etanol dengan kadar tertinggi. Hasil menunjukkan waktu optimal pemanfaatan fermentor adalah 72 jam dengan kemurnian etanol tertinggi 43,44%.
PERHITUNGAN TAMPANG LINTANG DIFERENSIAL HAMBURAN ELASTIK ELEKTRON-ARGON PADA 10,4 EV DENGAN ANALISIS GELOMBANG PARSIAL Pandiangan, Paken; Suhartono, Suhartono
Jurnal Matematika Sains dan Teknologi Vol 5 No 2 (2004)
Publisher : LPPM Universitas Terbuka

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Abstract

It has been calculated theoretically using the partial wave methods for the elastic scattering differential cross-section of electron-argon at 10.4 eV.  The wave function from Schrodinger equation  was computed by the Numerov integration methods.  For simplicity of scattering system , the Gaussian potential form has been employed.  For comparison between theoretical and experimental approach then we used the test. The  for this research is 2.386 that shows this calculation is good. 
KERJA PASAK BUMI (Eurycoma Longifolia. JACK) TERHADAP TINGKAH LAKU DAN LIBIDO TIKUS PUTIH JANTAN Hurip Pratomo; Adi Winarto; Edi Rusdiyanto
Jurnal Matematika Sains dan Teknologi Vol. 11 No. 1 (2010)
Publisher : LPPM Universitas Terbuka

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A research to observe sexual behavior or libido because of the treatment of pasak bumi (Eurycoma longifolia Jack) boiled water was conducted. Observation used a designed cage within an estrus female white rat partitioned by wire net. There were four variations doses of pasak bumi boiled water administered to white male mature rats. The first dose was 18 mg/200 g bw (bw= body weight), the second dose was 100 mg/200 g bw, the third dose was 200 mg/200 bw, and the control that administered aquadest 1 ml. Male rat sexual behavior characteristics were: 1. Coming near female partition, 2. Scratching/nipping partition, 3. Meet face to face. The result of the analysis showed that libido stimulated by administered pasak bumi boiled water. The best effect of libido raised by administered the first dose = 18 mg/200 g bw. Meanwhile the effect of libido of dose 2 and 3 better than the control group aquadest but lower than the effect of dose 1 did.
ISOLASI DAN KARAKTERISASI BAKTERI PATOGEN PADA BENIH PADI DAN KEDELAI Winarni, Inggit
Jurnal Matematika Sains dan Teknologi Vol 14 No 2 (2013)
Publisher : LPPM Universitas Terbuka

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Healthy seedlings is required in the cultivation of crops. Bad seeds can reduce the quality and quantity of crop yields. This research aim was to find a group of pathogenic bacteria rice and soybean seed from Seed Technology Experimental Garden IPB-Darmaga. The research was conducted in 2004 at the Microbiology Laboratory of the Department of Biology Faculty, Bogor Agricultural University. This research began with the isolation, followed by morphological and physiological characterization based on Bergey's Manual of Determinative Bacteriology. Morphological characterization includes the observation of the shape and colour of colonies,Gram stain test, and motility test. Physiological examination were catalase test, oxidase test, xanthomonadin test, and test poly hydroxy butyrate. Those characterizations of rice and soybean seeds samples suspected one group of pathogenic bacteria. The stydy showed that the morphology and physiology characters of colony were shape round, convex, white-yellow, Gram negative, motile, rod-shaped cells, catalase positive, oxidase negative, negative xanthomonadin, and PHB negative. Both bacterial pathogens of rice and soybean seeds showed characteristics similar to those Pseudomonas sp., so it is strongly suspected that these two bacteria are grouped into the genus of Pseudomonas sp. Benih yang sehat diperlukan dalam budidaya tanaman. Benih tidak sehat dapat  menurunkan kualitas dan kuantitas produksi. Penelitian ini bertujuan untuk mendapatkan beberapa kelompok bakteri patogen benih padi dan kedelai yang berasal dari kebun percobaan jurusan Teknologi Benih IPB-Darmaga. Penelitian dilaksanakan pada tahun 2004 di Laboratorium Mikrobiologi Departemen Biologi FMIPA, Institut Pertanian Bogor. Penelitian diawali dengan kegiatan isolasi, dilanjutkan dengan karakterisasi morfologi dan fisiologi berdasarkan Bergey’s Manual of Determinative Bacteriology. Karakterisasi morfologi meliputi pengamatan terhadap: bentuk dan warna koloni, uji pewarnaan Gram, dan uji motilitas. Karakterisasi fisiologi meliputi uji katalase, uji oksidase, uji xanthomonadin, dan uji poly hidroksi butirat. Hasil isolasi pada masing-masing sampel benih padi dan kedelai ditemukan satu jenis bakteri patogen, yang selanjutnya dikarakterisasi secara morfologi dan fisiologi. Hasil uji morfologi dan fisiologi menunjukkan bahwa bentuk koloni bulat, cembung, warna putih-kuning, Gram negatif, bersifat motil, sel berbentuk batang, katalase positif, oksidase negatif, xanthomonadin negatif, dan PHB negatif. Kedua bakteri patogen benih padi dan kedelai memperlihatkan ciri yang sama dengan kelompok Pseudomonas sp., sehingga diduga kuat kedua bakteri tersebut dikelompokkan ke dalam genus Pseudomonas sp.
PEMANFAATAN INOKULAN AIR LIMBAH CUCIAN BERAS SEBAGAI PUPUK ORGANIK PADA TANAMAN SEDAP MALAM Elfarisna, Elfarisna; Puspitasari, Rita Tri; Widad, Sofiyah AI; Suryati, Yati; Pradana, Nosa T
Jurnal Matematika Sains dan Teknologi Vol 16 No 2 (2015)
Publisher : LPPM Universitas Terbuka

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Tuberose flower has advantages in color, fragrance, and the flowers are unique pieces. Excessive use of chemical fertilizers and continuously cause an imbalance of nutrients and soil structure, effect on the agricultural land. The use of organic fertilizers can be the solution. This study aims to determine the effectiveness of inoculants are tested on waste water of rice as an organic fertilizer on  tuberose flower. The experiment was conducted for September 2014 to  January 2015. Theexperiment used randomized complete block design (RCBD) with five treatments, ie: inoculant I (3 bacteria and 2 yeast) + inorganic fertilizer 50 %; inoculant I  + inorganic fertilizers 25 % ; inoculant II (2 bacteria and 2 yeast) + inorganic fertilizer 50 % , inoculant II +  inorganic fertilizer 25 %, and inorganic fertilizer 100 %/control (5 g NPK  + 5 g NPS). The parameters observed were flowering time, flower stem length, number of florets per panicle, the diameter of the flower stalk, harvest time, and the amount of harvest. The results showed that gave inoculants on  waste water of rice are non significant for all treatments. From the result inoculant II + inorganic fertilizers 25 % tend to better and benefit than others. Bunga sedap malam memiliki kelebihan pada warna, keharumannya, dan utas bunganya yang unik. Penggunaan pupuk kimia yang berlebihan dan terus menerus menyebabkan ketidakseimbangan nutrisi dan kesehatan tanah, yang nantinya akan berefek pada lahan dan tanaman. Penggunaan pupuk organik menjadi solusinya. Penelitian ini bertujuan untuk mengetahui efektifitas inokulan yang teruji pada air limbah cucian beras sebagai pupuk organik pada tanaman sedap malam. Penelitian telah dilaksanakan pada bulan September 2014 sampai bulan Januari 2015. Penelitian menggunakan Rancangan  Kelompok Lengkap Teracak (RKLT) dengan lima perlakuan, yaitu Inokulan I (3 Bakteri + 2 Khamir) + pupuk anorganik 50%, Inokulan I + pupuk anorganik 25%, Inokulan II (2 Bakteri + 2 Khamir) + pupuk anorganik 50%, Inokulan II + pupuk anorganik 25%, kontrol /pupuk anorganik 100%(5 g NPK  dan 5 g Pupuk Majemuk NPS). Parameter yang diamati adalah waktu berbunga, panjang tangkai bunga, jumlah kuntum per malai, diameter tangkai bunga, waktu panen, dan jumlah panen. Hasil penelitian menunjukkan bahwa pemberian inokulan pada air limbah cucian beras tidak memberikan pengaruh yang berbeda terhadap semua perlakuan. Dari penelitian ini menunjukkan bahwa perlakuan Inokulan II + pupuk anorganik 25% cenderung lebih baik dan menguntungkan dari perlakuan lainnya.  
PERBANDINGAN METODE MODEL-BASED DENGAN METODE K-MEAN DALAM ANALISIS CLUSTER Pardede, Timbul
Jurnal Matematika Sains dan Teknologi Vol 8 No 2 (2007)
Publisher : LPPM Universitas Terbuka

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K-mean method is a clustering method in which grouping techniques are based only on distance measure among observed objects, without considering statistical aspects. Model-based clustering is a method that use statistical aspects, as its theoretical basis i.e. probability maximum criterion. This model has several variations with a variety of geometrical characteristics obtained by mean Gauss component. Data partition is conducted by utilizing EM (expectation-maximization) algorithm. Then by using Bayesian Information Criterion (BIC) the best model is obtained. This research aimed to comparing result of grouping methods between model-based clustering and K-mean clustering. The results showed that model-based clustering was more effective in separating overlap groups than K-mean.  
PERSEPSI ANGGOTA TERHADAP PERAN KELOMPOK TANI DALAM MENINGKATKAN KEMAMPUAN PENGUASAAN TEKNOLOGI BUDIDAYA BELIMBING Yani, Diarsi Eka
Jurnal Matematika Sains dan Teknologi Vol 11 No 2 (2010)
Publisher : LPPM Universitas Terbuka

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This research aims are: (1) to identify factors related to the member perception on the role of farmer group; (2) to identify member perception on the role of farmer group related to competencies of farmer group member on the implementation of technology; and (3) to explain the role of agricultural extension workers to improve the ability of members on starfruit cultivation technology. Research uses a survey method, the population were farmer group member on Pasir Putih village, Sawangan district, Depok, with. number of samples were 40 people. The data were analyzed by the Spearman Rank test. Perceptions to the leadership group and group networking related significantly with perceptions of the role of members farmer group as study class. Experience farming management related significantly with perceptions of the farmer group member role as production unit farming management and cooperation vehicle. Farmer member group access by information related significantly with perception of the farmer group member as cooperation vehicle. The involvement of members in group activities related significantly with perceptions of the role of members farmer group as study class. The competencies of group member in skill technology related significantly to the role of group as study class and cooperation vehicle.

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