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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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POTENSI RUMPUT LAUT DI PANTAI BAYAH, KABUPATEN LEBAK, BANTEN SEBAGAI ANTIBAKTERI Escherichia coli Triastinurmiatiningsih, Triastinurmiatiningsih; Haryani, Tri Saptari
Jurnal Matematika Sains dan Teknologi Vol 9 No 1 (2008)
Publisher : LPPM Universitas Terbuka

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Abstract

Antibacterial potency of some seaweed against Escherichia coli has been known. The aim of this research is to know the species of seaweeds from Bayah beach Lebak Banten which may be used as antibacterial against Escherichia coli. Twenty one seaweed species samples from Bayah Beach Lebak Banten were exstracted by organic solvent of absolute methanol according to Espeche, Fraile, and Mayer (1984) and Darusman, Sayuti, Komar & Pamungkas (1992) methods. The antibacterial activities were examined by means of Kirby-Bauer or diffusion method. The results showed antibacterial activities occur from the extract of Boodlea composite, Chaetomorpha crassa, Ulva fasciata, Sargassum crustaefolium, Padina australis and Halimeda gracilis. Sofar, Padina australis extract had shown better inhibitory activities than others.
PRODUKSI UMBI MINI (G0) KENTANG DARI STEK MINI DALAM RUMAH KETAT SERANGGA Gunarto, Anton
Jurnal Matematika Sains dan Teknologi Vol 6 No 2 (2005)
Publisher : LPPM Universitas Terbuka

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Abstract

The purpose of the research is to apply the cultivation technology in mini tuber (G0) and to investigate the phenotypic performances quantitative of three potato clones A5, PAS3063 and PAS3064 which were resistant from bacterial wilt disease (Ralstonia solanacearum). The commercial potato varieties (Granola and Atlantic) were used as comparison varieties. All clones (A5, PAS3063 and PAS3064), and two other varieties (Granola and Atlantic) wereconsistently resistant from bacterial wilt disease. The vegetative and the production variables of the tested clones were significantly different from those two commercial potato varieties. A5 and PAS3064 clones showed better vegetative and production characteristic than two commercial potato varieties. PAS3064 clone showed better performance compared with Atlantic variety, but it was almost similar compare with Granola variety.
PEMODELAN FLUKTUASI MUKA AIR TANAH UNTUK MENDUKUNG PENGELOLAAN AIR PADA PERTANIAN LAHAN RAWA PASANG SURUT TIPE A/B Ngudiantoro, Ngudiantoro; Pawitan, Hidayat; Ardiansyah, Muhammad; J. Purwanto, M Yanuar; Susanto, Robiyanto H.
Jurnal Matematika Sains dan Teknologi Vol 10 No 2 (2009)
Publisher : LPPM Universitas Terbuka

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Abstract

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.
USING REMOTE SENSING MULTI-TEMPORAL IMAGE TO ANALYSE THE LAND USE CHANGES AND ITS IMPACT ON THE PEAK DISCHARGE IN GARANG WATERSHED CENTRAL JAVA Cahyadi, Ahmad; Nugraha, Henky; Nurjani, Emilya; Yananto, Ardila; Wijaya, Muhammad Sufwandika
Jurnal Matematika Sains dan Teknologi Vol 13 No 2 (2012)
Publisher : LPPM Universitas Terbuka

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Abstract

Perubahan penggunaan lahan di Kota Semarang akibat pertumbuhan penduduk dan aktivitas ekonomi telah menyebabkan terjadinya urban sprawl. Banjir rob, land subsidence, intrusi air laut dan tercemarnya air tanah di Kota Semarang Bagian Utara menyebabkan terjadinya perkembangan Kota Semarang dominan ke arah selatan. Hal ini menyebabkan perubahan penggunaan lahan dari lahan non terbangun menjadi lahan terbangun sehingga jumlah air hujan yang langsung menjadi limpasan akan semakin banyak. Hal ini akan menyebabkan bahaya banjir bandang di Kota Semarang semakin besar. Penelitian ini bertujuan untuk: (1) mengetahui perubahan lahan yang terjadi di DAS Garang selama tahun 1994 dan 2001, dan (2) mengetahui dampak perubahan penggunaan lahan terhadap besarnya debit puncak yang terjadi di DAS Garang. Data yang digunakan dalam penelitian ini adalah Citra Landsat TM tahun 1994, Citra Landsat ETM tahun 2001, dan Citra Alos AVNIR 2008, peta tanah DAS Garang, peta kemiringan lereng DAS Garang, peta jaringan sungai DAS Garang, dan data curah hujan harian Stasiun Ungaran tahun 1952 sampai dengan tahun 2009. Ditemukan bahwa luas lahan terbangun bertambah lebih dari dua kali lipat dari tahun 2001 sampai dengan 2008, lahan pertanian meningkat hampir 50% dan luas hutan mengalami penurunan dari tahun ke tahun. Namun demikian, debit puncak di DAS Garang tidak bertambah secara ekstrem meskipun mengalami sedikit perubahan. Change due to land use in the city of Semarang as an impact of population growth and economic activity has led to urban sprawl. Rob flooding, land subsidence, seawater intrusion and contamination of ground water in the northern part of Semarang lead to the development of the southern part. Consequently, this leads to changes in land use so that the amount of rain water runoff will increase. This may cause the danger of flash floods in the greater city of Semarang. This study were aimed to: (1) determine the changes that occur in the Garang watershed lands during 1994 and 2001, and (2) determine the impact of land use changes on the size of the peak discharge occurring in the Garang watershed. The data used in this study were the 1994 Landsat TM, Landsat ETM 2001, and Citra Alos AVNIR 2008, Garang watershed soil map, slope map of Garang watershed stream network, and daily rainfall data at Ungaran Station of 1952 until 2009. It was found that developed land has been increasing more than doubled from 2001 to 2008, agricultural land increased by nearly 50% and the forest area were decreased from year to year. However, the peak discharge at the Garang watershed has not increased to the extreme though there was a slight change.  
KOMPUTASI DISTRIBUSI NEUTRON DALAM STATISTIK MAXWELL BOLTZMANN Tuti Purwoningsih
Jurnal Matematika Sains dan Teknologi Vol. 13 No. 1 (2012)
Publisher : LPPM Universitas Terbuka

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Abstract

The migration of neutron is arranged by some probability distributions such as probability of spread distribution, probability of distance distribution, probability of energy distribution and probability of flux distribution. One application of these pattern distributions is modelling the reaction between neutron and elements which compose the tissue related to the absorption of neutron in brain cancer tissues. This article explores computation analysis of pattern of distribution of neutron flux in a reactor system. Variables were the amount of neutron simulated and the depth of cylindrical reactor system. Simulations showed that 20-120 minutes was needed in executing 100,000 neutrons to build the distribution pattern of neutrons flux. This pattern was also depended on the depth of the system. In all depths, the peak of neutron flux distribution pattern was in the 3rd bin. Comparison between this simulations and experiment results in literatures showed that by analyzing the simulation of the distribution of neutron flux, a Poisson distribution which follows the Maxwell-Boltzmann was resulted. Perpindahan neutron diatur dengan beberapa peluang distribusi, seperti peluang distribusi sudut hamburan, peluang distribusi jarak perpindahan, peluang distribusi energi transfer, serta peluang distribusi fluks neutron. Salah satu aplikasi dari pola distribusi ini adalah pemodelan reaksi antara neutron dengan elemen-elemen penyusun jaringan yang terkait dengan serapan neutron dan dosis yang terserap oleh jaringan tumor otak pada terapi BNCT (Boron Neutron Capture Therapy). Dalam penelitian ini dibahas analisis komputasi tentang pola distribusi fluks neutron dalam suatu sistem reaktor. Variabel dalam penelitian ini adalah banyaknya neutron yang disimulasikan, serta kedalaman sistem reaktor yang dalam penelitian ini menggunakan sistem reaktor berbentuk silinder. Hasil simulasi menunjukkan bahwa dengan neutron sebanyak 100.000 diperlukan waktu eksekusi sekitar 20 120 menit untuk menghasilkan pola distribusi fluks neutron yang bergantung pada kedalaman sistem yang digunakan. Untuk semua kedalaman, puncak pola distribusi fluks neutron berada pada bin ke tiga. Dari perbandingan antara hasil simulasi dengan eksperimen dari literatur, dapat disimpulkan bahwa melalui analisis simulasi untuk distribusi fluks neutron diperoleh suatu distribusi Poisson yang mengikuti statistik Maxwell-Boltzmann.
ESTIMASI NILAI VALUE AT RISK PORTOFILIO MENGGUNAKAN METODE t-COPULA Dharmawan, Komang
Jurnal Matematika Sains dan Teknologi Vol 15 No 1 (2014)
Publisher : LPPM Universitas Terbuka

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Abstract

Value at Risk merupakan suatu alat yang dipakai untuk mengukur risiko investasi. Value at Risk menjelaskan besarnya kerugian terburuk yang terjadi pada investasi dalam produk finansial dengan tingkat kepercayaan tertentu dan dalam interval waktu tertentu. Beberapa metode telah dikembangkan untuk menaksir Value at Risk, seperti simulasi data historis, simulasi Monte Carlo, GARCH(1,1), EWMA, dan lain-lain. Namun, metode-metode tersebut masih dianggap tidak dapat menjelaskan struktur keterkaitan masing-masing variabel random yang membentuk portofolio tersebut. Dengan menggunakan fungsi copula, keterkaitan masing-masing saham dalam distribusi gabungannya dapat dimodelkan sehingga prilaku distribusi marginalnya dapat diamati dengan lebih detail. Pada makalah ini t-copula digunakan untuk memodelkan struktur kebergantungan (dependence) pada distribusi gabungan tingkat pengembalian portofolio. Fungsi t-copula adalah bentuk umum dari fungsi distribusi multivariat t-student, dimana t-copula dapat memodelkan dan mengestimasi distribusi multivariat t-student tanpa harus mengasumsikan variabel-variabel acaknya berdistribusi normal. Dalam analisi data, fungsi t-copula membutuhkan data yang saling bebas dan identik dalam distribusi (iid). Data empiris yang digunakan dalam penelitian ini adalah data indeks Jakarta Stock Exchange dan indeks Kuala Lumpur Stock Exchange dicatat pada kurun waktu 30 Mei 2008 sampai 30 Mei 2013 (1270 observasi). Value at Risk yang dihitung menggunakan periode horizon T=22 hari kedepan untuk tingkat kepercayaan masing-masing 90%, 95%, 99%. Dibandingkan dengan Gaussian copula, t-copula memberikan hasil yang lebih baik. Hasil ini sesuai dengan teori, walaupun perbedaannya tidak terlalu signifikan.
PENGARUH TEGAKAN AKASIA (ACACIA NILOTICA) (L.) WILLD. EX. DEL. TERHADAP KOMPOSISI DAN KEANEKARAGAMAN TUMBUHAN BAWAH DI SAVANA BALANAN TAMAN NASIONAL BALURAN JAWA TIMUR Djufri, Djufri
Jurnal Matematika Sains dan Teknologi Vol 5 No 2 (2004)
Publisher : LPPM Universitas Terbuka

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The research was done in Baluran National Park, Banyuwangi East Java in April to June 2004. The objectives of this research were :  to determine of species composition, importance value of species, diversity index and evenness index, similarity index, distribution pattern of species, and species association. This research used the quadrat method. The determination of the species distribution was calculated using Poisson distribution formula and the determination of association was calculated using contingency table. The results of this research indicated that,  there were 20 species of the plant belong to 8 familiy. The importance value was between 0,42-59,54, and species with high importance value is Oplismenus burmanii, Axonopus compressus, and Synedrella nudiflora. The diversity index was between 1,3329-2,5271, and evenness index was between 1,5364-1,9848. The distribution pattern of species indicated that 12  species were  clumped, 6 species were reguler  and 2 species were at random. The multi-plants tend to have a clumped distribution pattern, and single plant tend to have a reguler or random distribution pattern. The of association indicated that 2 species  association which the highest tindex.
ANALISIS KEBERLANJUTAN USAHATANI HORTIKULTURA SAYURAN PADA LAHAN BERLERENG DI HULU DAS JENEBERANG, SULAWESI SELATAN Saida Saida; S Sabiham; Widiatmaka Widiatmaka; S H Sutjahjo
Jurnal Matematika Sains dan Teknologi Vol. 12 No. 2 (2011)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/jmst.v12i2.550.2011

Abstract

This study aimed to analyse the sustainability of vegetables horticultural farming on sloping land in the upstream Jeneberang watershed based on the index evaluation and the status of sustainability by Rap-farm method using Multidimensional Scaling (MDS).Results of ordination technique analysis Rap-farm method of MDS showed that index of vegetables horticultural farming sustainability ranged from 32.19-62.53. Dimension of ecological, economical, institutional, and technological included into sustainable enough category, while social dimension, included into less sustainable category in vegetables horticultural farming systems.Results of leverage Rap-farm analysis showed that from 43 attributes that were analyzed, there were 23 sensitive attributes that affected into the sustainability of vegetables horticultural farming systems in the upstream of Jeneberang watershed.
PEMBERIAN BEBERAPA DOSIS PUPUK MULTICOTE TERHADAP PERTUMBUHAN AKASIA (Acacia mangium) DI PEMBIBITAN Elfarisna, Elfarisna; Setijorini, Ludivica Endang
Jurnal Matematika Sains dan Teknologi Vol 14 No 2 (2013)
Publisher : LPPM Universitas Terbuka

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This study aims to determine the use of some dose of Multicote’s fertilizer on the growth of Acacia mangium seedlings and get the most effective dose of Multicote’s fertilizer in increasing the growth of Acacia mangium seedlings in the nursery. The study was conducted in May to July 2012, at the Faculty of Agriculture Experimental Farm, of Muhammadiyah’s University in Jakarta. The design used in this study is a randomized block design (RBD), with six dose treatments of Multicote fertilizer are: 0 g / plant (control), 2 g / plant, 4 g / plant, 6 g / plant, 8 g / plant, and 10 g / plant, each treatment was repeated four times. The parameters measured were height of plant, percentage of growth, wet weight and dry weight of plants. The research results showed that the treatment given was not significantly different on the height of plant height at the initial growth (4 MST, 6 MST and 8 MST), but at end of the observation (10 MST and 12 MST) showed that the treatment was  significantly different on the height of the plant. Of all the treatment given, the use of 10 g / plant of multicote is feltilizer gave the best effect on the height of plant, wet weight and dry weight of plant acacia. Control treatment without fertilizer multicote give the least influence on plant height, wet weight and dry weight of plant acacia’s plant. Penelitian ini bertujuan mendapatkan dosis pupuk Multicote yang paling efektif dalam meningkatkan pertumbuhan bibit Acacia mangium di pembibitan. Penelitian dilaksanakan pada bulan Mei sampai dengan bulan Juli 2012, di Kebun Percobaan Fakultas Pertanian Universitas Muhammadiyah Jakarta. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK), dengan enam perlakuan dosis pupuk Multicote yaitu :  0 g/tanaman (kontrol), 2 g/tanaman, 4 g/tanaman, 6 g/tanaman, 8 g/tanaman, dan 10 g/tanaman, setiap perlakuan diulang empat kali. Parameter yang diamati adalah tinggi tanaman, persentase tumbuh, bobot basah tanaman dan bobot kering tanaman. Hasil penelitian menunjukkan pada pertumbuhan awal (4 MST, 6 MST dan 8 MST), perlakuan yang diberikan tidak memberikan pengaruh yang berbeda nyata terhadap tinggi tanaman. Namun di akhir pengamatan (10 MST dan 12 MST), perlakuan yang diberikan memberikan pengaruh yang berbeda nyata terhadap tinggi tanaman. Penggunaan pupuk Multicote dengan dosis 10 g/tanaman memberikan pengaruh yang paling baik terhadap tinggi tanaman, bobot basah dan bobot kering tanaman Akasia. Tanpa pupuk Multicote tinggi tanaman, bobot basah dan bobot kering tanaman Akasia adalah yang paling rendah.
HUBUNGAN ANOPHELES BARBIROSTRIS DENGAN MALARIA Iryani, Krisna
Jurnal Matematika Sains dan Teknologi Vol 12 No 1 (2011)
Publisher : LPPM Universitas Terbuka

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Malaria is a disease caused by intercellular obligate protozoa genus of Plasmodium which is a parasite carried by female Anopheles mosquito. One of them is Anopheles barbirostris. Research in several places already proved that Anopheles barbirostris acts as a vector of malaria. One case that occurred in Cineam district, Tasikmalaya regency showed that Anopheles barbirostris is suspected as vector of malaria. This is proven through a research on the relationship between Anopheles barbirostris with malaria. Data was taken from the larvae and adult mosquitoes captured around Cineam village, Tasikmalaya. The observation was done in the open field and laboratory. Data and identification by pictorial key for female Anopheles showed that the population of Anopheles barbirostris was always a dominant population compared to another Anopheles species. Because of the breeding ponds and the resting places were around the village, it is suspected that they mainly bit humans. The result of the observation in laboratory showed the life cycle of Anopheles barbirostris are around 20-27 days, and the longevity of 20 days. Morphological identification of Anopheles barbirostris by pictorial key for female Anopheles showed that there is no any significant difference. This research showed that Anopheles barbirostris was suspected as vector of malaria in Cineam village, Tasikmalaya.

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