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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 396 Documents
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ESTIMASI PARAMETER DAN UJI HIPOTESIS PADA MODEL LINEAR MULTIVARIAT DENGAN METODE LDL Makkulau Makkulau; Susanti Linuwih; Purhadi Purhadi; Muhammad Mashuri; Rahmawati Pane
Jurnal Matematika Sains dan Teknologi Vol. 11 No. 1 (2010)
Publisher : LPPM Universitas Terbuka

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Outliers are observations (data) that lies in an abnormal distance from other observations. Outliers can be distinguished into outliers of univariate or multivariate observation and outliers of univariate or multivariate linear models. Multivariate linear model is a linear model with more than one dependent (response) variables. This research studied parameter estimation and hypothesis test for multivariate linear model using Likelihood Displacement Statistic-Lagrange Method called as LDL method for detecting outlier observations in multivariate linear models with the LDLAm statistical test.
RESPON PERTUMBUHAN STEK DAUN LIDAH MERTUA (Sansevieria Parva) PADA PEMBERIAN ZAT PENGATUR TUMBUH SINTETIK (ROOTONE-F) DAN ASAL BAHAN STEK Sulistiana, Susi
Jurnal Matematika Sains dan Teknologi Vol 14 No 2 (2013)
Publisher : LPPM Universitas Terbuka

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This research aims to study the growth response of plant leaf cuttings mother in-law’s tongue (Sansevieria parva) of various synthetic plant growth regulator treatment (Rootone-F) and origin of cuttings. Experiments performed with 3x3 factorial design with completely randomized design patterns. The first factor is the dose of Rootone-F ZPT which consists of 3 levels: 0 g/cuttings as a control (R0); 0.2 g/cuttings (R1), 0.4 g/cuttings (R2). The second factor is the origin of cuttings, namely the top/tip leaves (B1), the middle leaves (B2), and the bottom/ leaves base (B3). Parameters observed and measured is the experiment percentage of live cuttings, the percentage of rooted cuttings, the percentage of sprouted cuttings, root length, number of roots, root wet weight, and root dry weight. The results showed synthetic plant growth regulator treatment (Rootone-F) to respond to growth parameters leaf cuttings on root length, number of roots, root wet weight, and root dry weight compared with controls. The treatment combination of synthetic plant growth regulator (Rootone-F) 0.4 g/cuttings by cutting material from the middle to give the best results on the parameters of the root, root wet weight, and dry weight, whereas the combination treatment of synthetic plant growth regulator (Rootone-F) 0, 2 g/cuttings by cutting material from the middle to give the best results on the parameters of the plant leaf cuttings root length Sansevieria parva at the end of the experiment. Penelitian ini bertujuan untuk mempelajari respon pertumbuhan stek daun tanaman lidah mertua (Sansevieria parva) terhadap berbagai perlakuan Zat pengatur tumbuh (ZPT) sintetik (Rootone-F) dan asal bahan stek. Percobaan dilakukan dengan Rancangan Faktorial 3x3 dengan pola Rancangan Acak Lengkap (RAL). Faktor I adalah dosis ZPT Rootone-F yang terdiri dari  3 taraf : 0 g/stek sebagai kontrol (R0) ; 0,2 g/stek (R1) ; 0,4 g/stek (R2). Faktor II adalah asal bahan stek, yaitu bagian atas/ujung daun (B1), bagian tengah daun (B2), dan bagian bawah/pangkal daun (B3). Parameter yang diamati dan diukur adalah persentase stek hidup, persentase stek berakar, persentase stek bertunas, panjang akar, jumlah akar, bobot basah akar, dan bobot kering akar. Hasil penelitian menunjukkan perlakuan ZPT sintetik (Rootone-F) merespon pertumbuhan stek daun pada parameter panjang akar, jumlah akar, bobot basah akar, dan bobot kering akar dibanding dengan kontrol. Perlakuan kombinasi ZPT sintetik (Rootone-F) 0,4 g/stek dengan asal bahan stek bagian tengah memberikan hasil yang terbaik pada parameter jumlah akar, bobot basah akar, dan bobot kering, sedangkan perlakuan kombinasi ZPT sintetik (Rootone-F) 0,2 g/stek dengan asal bahan stek bagian tengah  memberikan hasil yang terbaik pada parameter panjang akar stek daun tanaman Sansevieria parva pada akhir percobaan.
PARTISIPASI KARYAWAN UNTUK KEBERLANJUTAN PRODUKSI CAT EMPLOYEE PARTICIPATION FOR SUSTAINABILITY OF PAINT PRODUCTION Wrinarti, Sri; Budhi Soesilo, Tri Edhi; Listyarini, Sri
Jurnal Matematika Sains dan Teknologi Vol 16 No 2 (2015)
Publisher : LPPM Universitas Terbuka

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Paint production generates hazardous and toxic waste. The amount of waste can be reduced if the paint factory employees, especially in the Production and Health Safety Environment & Security units, participates to reduce the amount of waste in accordance with the company's target for the sustainability of the paint production. Currently, PT. XYZ, a paint industry, has never conducted a survey to determine the role of its employees to reduce the amount of waste. This study was conducted to analyze the employee perception of their role to reduce the amount of waste. To analyze the perception of the role of employees, a survey of 93 respondents was conducted. The value of the role of respondents to reduce the amount of waste is 4.93 out of 6. In conclusion, the value of the role of respondent perception to reduce the amount of waste is 4.93 in six scales. Produksi cat menghasilkan limbah Bahan Berbahaya dan Beracun. Jumlah limbah pabrik cat dapat dikurangi apabila karyawan pabrik, khususnya di bagian Produksi dan Health Safety Environment & Security, berpartisipasi untuk menurunkan jumlah limbah sesuai dengan target perusahaan untuk keberlanjutan produksi cat. Saat ini PT. XYZ, sebuah industri cat, belum pernah melakukan survei untuk mengetahui peranan karyawannya untuk menurunkan jumlah limbahnya. Penelitian dilakukan untuk menganalisis persepsi karyawan tentang peranan mereka untuk menurunkan jumlah limbah. Untuk menganalisis persepsi peranan karyawan, telah dilakukan survei terhadap 93 responden. Nilai persepsi karyawan tentang peranan mereka untuk menurunkan jumlah limbah adalah 4,93 dari skor maksimum 6.  Kesimpulannya, nilai persepsi karyawan tentang peranan mereka untuk menurunkan jumlah limbah adalah 4,93 dari 6 skala.
PENAPISAN AKTINOMISETES YANG BERSIFAT ANTAGONIS TERHADAP PENYAKIT LAYU BAKTERI TANAMAN CABE Winarni, Inggit; K, Elizabeth Novi
Jurnal Matematika Sains dan Teknologi Vol 8 No 1 (2007)
Publisher : LPPM Universitas Terbuka

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Ralstonia solanacearum can cause droop bacteria desease in chilli plants which resulted in productivity’s decreasing. Chemical subtances commonly used to eliminate the bacteria is costly and have negative effect on environment. This research aims to eliminate the varied actinomisetes and to get antagonistics actinomisetes towards the droop bacteria desease of chilli plants. The Botanical forest in Baturaden was chosen because has unique and high diversity microorganism that has characteristic antagonism that pressure growth of other antagonistic’s because of antimicrobe. A number of 18 actinomisetes isolat were successfully isolated and then rejuvenated based on morphology, colours, and shape of the colonies. A characterization of morphology trait towards target bacteria had also been conducted. Six of the 18 actinomisetes isolat have antagonist characteristics towards target bacteria’s growth. Isolat Btrd II.g and Btrd IV.l have the highest resistor activity as indicated by a 6 and 5 mm crystal clear zone. It indicated that actinomisetes isolat Btrd II.g and Btrd IV.l have relatively high antagonist characteristics. Btrd II.g and Btrd IV.l are potential to be used as an environmental friendly way to eliminate droop bacteria desease in chilli plants.
ANALISIS KARAKTERISTIK KELOMPOK DENGAN MENGGUNAKAN PENDEKATAN CLUSTER ENSEMBLE Rahayu, Dyah Paminta
Jurnal Matematika Sains dan Teknologi Vol 14 No 1 (2013)
Publisher : LPPM Universitas Terbuka

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Clustering is one of data mining techniques which is used to group databased on similarity of the object data attributes. In general clustering algorithm is developed to process only one type of data, either category or numerical data type. Not many algorithms were developed to process the mixture between category and numerical data. One algorithm to process the mixed data is algCEBMDC, a clustering algorithm using cluster ensemble approach. The purpose of this study was to analyze the characteristics of the results of clustering algorithms algCEBMDC. The research methods follow the work-flow of data mining and algCEBMDC algorithm. The data used is the data of inactive students of Mathematics study program in Universitas Terbuka (The Indonesia Open University). First, the data is cleared up to get clean data ready for processing, and then is separated into two groups based on the type of category data and numerical data. The category data is processed using QROCK algorithm, producing 44 groups which is obtained at the 0.98 threshold value with cohesion of 2044. The numerical data is processed using AGNES algorithm, generating 69 groups which is derived from a combination of Cityblock Distance and Average link method with cophenet value of 0,822. The results of the two grouping are combined, considered as a data category, then is processed using QROCK algorithm. The resulting groups had similar characteristics on the end of education, employment status, marital status, and gender. The academic achievement factors indicate that the passing level of courses in the first two semesters are very low. It can be concluded that the first two semesters is a critical time for distance education students in mathematic study program. Pengelompokkan merupakan salah satu tehnik data mining yang digunakan untuk mengelompokkan data berdasarkan kemiripan atribut dari data obyek. Pada umumnya algoritma pengelompokan dikembangkan hanya untuk memproses salah satu tipe data kategori atau numerik. Tidak banyak algoritma yang dikembangkan untuk memproses data campuran kategori dan numerik. Salah satu algoritma untuk memproses data campuran adalah algCEBMDC, algoritma pengelompokan dengan pendekatan cluster ensemble. Tujuan penelitian ini adalah untuk menganalisis karakteristik hasil pengelompokan algoritma algCEBMDC. Metode penelitian mengikuti alur kerja data mining dan algoritma algCEBMDC. Data yang digunakan adalah data mahasiswa non aktif Program Studi Matematika FMIPA, Universitas Terbuka. Data awal bertipe campuran dibersihkan untuk mendapatkan data bersih siap proses, kemudian dipisah menjadi dua berdasarkan tipe datanya: kategori dan numerik. Data kategori diproses menggunakan algoritma QROCK, menghasilkan 44 kelompok yang diperoleh pada threshold 0.98 dengan nilai kohesi 2044. Data numerik diproses menggunakan algoritma AGNES, menghasilkan 69 kelompok yang diperoleh dari kombinasi ukuran jarak Cityblock distance dan metode penggabungan Average link dengan nilai cophenet 0,822. Hasil dari kedua pengelompokan digabung, dianggap sebagai data kategori, kemudian diproses menggunakan algoritma QROCK. Kelompok-kelompok yang dihasilkan memiliki kesamaan karakteristik pada pendidikan akhir, status pekerjaan, status perkawinan, dan jenis kelamin. Faktor prestasi akademik menunjukkan bahwa tingkat kelulusan matakuliah dalam dua semester pertama sangat rendah. Dapat dikatakan bahwa dua semester pertama merupakan masa kritis bagi mahasiswa Program Studi Matematika UT.
LIMBAH CAIR PANAS BUMI DAN DAMPAKNYA TERHADAP LINGKUNGAN Yuniarto, Yuniarto; Budhi Soesilo, Tri Edi; Hamzah, Udi Syahnoedi
Jurnal Matematika Sains dan Teknologi Vol 17 No 2 (2016)
Publisher : LPPM Universitas Terbuka

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Geothermal Power Plant Gothermal power plant is one of the green energy which produces low waste, including wastewater. The wastewater come from geothermal fluids that is not reinjected into the reservoir. its contains Arsenic (As), a dangerous chemical. Ulumbu geothermal Power Plant wastewater is discharged to the river nearby, Waekokor river. Arsenic (As) concentration in The wastewater has not been measures. The purpose of this research is to identify Arsenic (As) concentration in the geothermal wastewater. The result of this research shows that geothermal wastewater Arsenic (As) concentration is still below the regulation, that is 0,0365 mg/l. Geothermal wastewater discharge has no effect to the Arsenic (As) concentration in the river. Pembangkit Listrik Tenaga Panas Bumi Panas Bumi (PLTP) merupakan salah satu sumber energi yang ramah lingkungan karena menghasilkan limbah yang rendah, salah satunya adalah limbah cair. Limbah cair ini berasal dari fluida panas bumi. Fluida panas bumi yang tidak diinjeksikan kembali akan menjadi limbah cair. Salah satu zat kimia yang terkandung dalam limbah cair adalah Arsen (As). Pada lapangan panas bumi Ulumbu, limbah cair yang dihasilkan dari pembangkit listrik tenaga panas bumi dibuang kesungai Waekokor. Konsentrasi Arsen (As) pada limbah cair tersebut sampai dengan saat ini belum pernah diukur dan diteliti. Penelitian ini bertujuan untuk mengetahui besarnya konsentrasi Arsen (As)pada limbah cair yang dibuang ke Sungai Waekokor dan dampaknya terhadap lingkungan. Hasil dari penelitian ini menunjukkan bahwa konsentrasi Arsen (As) pada limbah cair PLTP Ulumbu yang dibuang ke sungai Waekoor masih dibawah baku mutu yang ditetapkan oleh pemerintah. Hasil dari penelitian ini menunjukkan juga bahwa pembuangan limbah cair ini tidak memberikan dampak terhadap lingkungan.  
KANDUNGAN NON NUTRISI DAN BILANGAN PEROKSIDA KERUPUK KULIT (KERUPUK JANGEK) Nadia, Lula
Jurnal Matematika Sains dan Teknologi Vol 7 No 2 (2006)
Publisher : LPPM Universitas Terbuka

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The aim of this research was to find the non nutrition compound of ‘kerupuk Jangek’. Several steps were used to determine: (1) the content of cholesterol, (2) the content of uric acid, (3) the content of peroxide, and (4) the hedonic value of  ‘kerupuk Jangek’ storaged for several period of time. The HPLC with ELSD detector analysis showed that no cholesterol was detected in both samples of the beef skin crackers and the buffalo skin crackers. Using Photometer 4020, it was found that there was 0.64 – 0.7 mg uric acid in 100 gr of the beef skin crackers. The rate of peroxide in the beef skin cracker was 1.0 mg/kg sample after 4 – 5 weeks storage in 30°C condition. From hedonic analysis, it was found that ‘kerupuk Jangek’ being rejected by the panelist after 7 weeks storage in 30°C condition, and the content of peroxide was 1.83 mg/kg. It is suggested that, the skin crackers should be consumed before 7 week storage in room temperature and it is not recommended for hyperuricemia one.
USING REMOTE SENSING MULTI-TEMPORAL IMAGE TO ANALYSE THE LAND USE CHANGES AND ITS IMPACT ON THE PEAK DISCHARGE IN GARANG WATERSHED CENTRAL JAVA Ahmad Cahyadi; Henky Nugraha; Emilya Nurjani; Ardila Yananto; Muhammad Sufwandika Wijaya
Jurnal Matematika Sains dan Teknologi Vol. 13 No. 2 (2012)
Publisher : LPPM Universitas Terbuka

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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.
ANALISIS KANDUNGAN BORAKS PADA MAKANAN: STUDI KASUS DI WILAYAH KECAMATAN PAMULANG, TANGERANG SELATAN Maman Rumanta; Krisna Iryani; Anna Ratnaningsih
Jurnal Matematika Sains dan Teknologi Vol. 17 No. 1 (2016)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/jmst.v17i1.186.2016

Abstract

This study aimed to analyze borax content in food and the effects of food processing on the content of borax in food. This research adopted a survey method. Food samples were obtained from the traditional and modern markets, elementary schools, and supermarkets available in the region of Pamulang Subdistrict. Sampling was done by using a purposive technique. Each sample was qualitatively analyzed for its borax content using a borax test kit. The detected food was then analyzed by using a qualitative analysis (i.e., there are four categories of data); one sample per category was taken to be analyzed quantitatively using the HPLC method in the Laboratorium of Balai Besar Pusat Penelitian dan Pengembangan Pascapanen Pertanian, Bogor. The treatment of food containing the highest level of borax) was conducted by boiling them during a certain period of time (i.e., 5 minutes, 15 minutes, and 30 minutes) and then frying them until well cooked (was not burnt). The collected data were then analyzed descriptively. The results showed that 54% of the samples obtained from the Elementary Schools positively contained borax; as much as 74% of the food samples obtained from traditional markets contained borax positively; while all samples coming from the supermarkets did not contain borax. The content of borax in the detected food in this research ranged between 560 mg/kg up to 17,640 mg/kg. The highest content of borax found in yellow wet noodles (17,640 mg/kg) was far above the maximum level specified by EFSA (2013), that is as much as 4,000 mg/kg. The boiling process was quite effective in lowering the level of borax in food, while the frying process did not actually reduce the level of borax in food. Penelitian ini bertujuan untuk menganalisis kandungan boraks pada makanan dan pengaruh pengolahan makanan terhadap kandungan boraks pada makanan. Penelitian ini dilakukan dengan metode survei. Jenis makanan yang dijadikan sampel dalam penelitian ini adalah jenis makanan yang diperoleh dari pasar tradisional dan modern, sekolah dasar, dan supermarket di wilayah Kecamatan Pamulang. Pengambilan sampel dilakukan dengan menggunakan teknik purposive sampling. Setiap sampel dianalisis kandungan boraksnya secara kualitatif menggunakan test kit boraks. Selanjutnya, makanan yang telah terdeteksi oleh analisis kualitatif (ada empat kategori data), diambil satu sampel per kategori untuk dianalisis secara kuantitatif menggunakan metode HPLC di Laboratorium Balai Besar Pusat Penelitian dan Pengembangan Pascapanen Pertanian, Bogor. Makanan yang terdeteksi mengandung boraks paling tinggi diperlakukan dengan cara direbus dalam beberapa rentang waktu (5 menit, 15 menit, dan 30 menit) dan digoreng sampai matang (tidak sampai gosong). Data yang dikumpulkan dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa 54% dari sampel makanan yang diperoleh dari Sekolah Dasar positif mengandung boraks; sebanyak 74% dari sampel makanan yang diperoleh dari pasar tradisional positif mengandung boraks; sementara semua sampel berasal dari supermarket tidak terdeteksi mengandung boraks. Kandungan boraks dalam makanan yang terdeteksi dalam penelitian ini berkisar antara 560 mg/kg sampai dengan 17.640 mg/kg. Kandungan tertinggi ditemukan dalam mie basah kuning (17.640 mg/kg) jauh di atas kadar maksimum yang ditentukan EFSA (2013) sebanyak 4.000 mg/kg. Proses perebusan cukup efektif dalam menurunkan kadar boraks dalam makanan, sedangkan proses penggorengan tidak mengurangi kadar boraks dalam makanan.
PRODUKSI MIKOINSEKTISIDA DARI PROPAGUL KAPANG Beauveria Bassiana Wahyudi, Priyo
Jurnal Matematika Sains dan Teknologi Vol 9 No 2 (2008)
Publisher : LPPM Universitas Terbuka

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Fungal insecticide or well known as mycoinsecticide is produced from propagules of entomopaghogenous fungi. It is a common knowledge that fungi can kill insects, individually or in epizootics, and methods for isolation and exploration of fungi are well known. Despite these facts, production of commercial preparations with fungi came very late. There is only one commercial product, which is produced on a large scale for several years. Beauveria bassiana is one of entomopathogenic fungus that has been used for biocontrol of many insects of crops. In this article we assess production of mycoinsecticide Beauveria bassiana through all stages of their handling, such as isolation, strain selection and optimation of production procedures both liquid and solid state fermentation. The result showed that the best way to produce mycoinsecticide in a large scale production was solid state fermentation using rice-base medium including cooked-rice and rice flour. The best incubation can be taken place in room temperature for 7 days.

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