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Jurnal Sains dan Teknologi
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Core Subject : Science, Education,
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Articles 118 Documents
ISOLASI DAN KARAKTERISASI Phytophthora palmivora PENYEBAB PENYAKIT BUSUK AKAR DAN BATANG PADA DURIAN Alberida, Heffi; Sunarwati, Diah; Yoza, Retra
Jurnal Sains dan Teknologi Vol 2, No 1 (2010)
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Isolation and characterization of fungus that caused root and stem rotten in durian have been conducted. Isolation using baiting method with apple and than inoculated to PSM medium, while characterization using light microscope. Characterization result showed that P. palmivora isolated from infected durian have white, stratified and stellate colony, unsepta hyphae and form clamidospore, oospore, zoospore and sporangium.Key words: isolation, Phytophthora palmivora, spora
TEKNIK IRIDOLOGI DAN KINESIOLOGI SEBAGAI ALTERNATIF MENGATASI MASALAH STRES DI SEKOLAH SEBAGAI AKIBAT PEMANASAN GOBAL Razak, Abdul; Lardiman, Hendra
Jurnal Sains dan Teknologi Vol 5, No 2 (2013)
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Iridology is the study of the iris of the eye. Iris is a collection of nerves that are delicate and represent and explain the whole condition of the body. Iridology last five years very rapid progress and by the authors have also developed and applied in the field of fisheries, education and human resource management field as needed. Likewise the case of Kinesiology is the study of the nerves in the arm that had been developed by the experts for the detection of various diseases and are able to explain scientifically the cause of the bodys mechanism of electromagnetic waves. In 2010, researchers have been applying both the science to determine the stress level of elementary school students and its relationship with the brain and trigger real stress conditions. The results of these studies indicate that the effect is real. That is both a science or its applications in the form of both knowledge -based techniques can be used to cope with the stress of environmental conditions, including global warming.Key words: engineering , iridology , kinesiology , stress and global warming
PENGGUNAAN BEBERAPA PELARUT ORGANIK DALAM EKSTRAKSI BESI(III) DENGAN OKSIN SECARA EKSTRAKSI PELARUT Devita, Liza
Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
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The research on the extraction of iron (III)  aims at finding the best condition of extraction of iron (III) using oksin (8-hidroksikuinolin) as the complement. It was done by setting the  oksin concentration, pH, and the appropriate solvent. The  extraction process was done in a separating funnel. The reaction occurs when the water phase containing ions of iron (III) contacted an organic phase containing oksin as a chelate ligand. The water phase was measured with atomic absorption Spectrophotometer.  The concentration of iron (III) in the organic phase extracted was obtained from the difference between the concentration of iron (III) with the initial concentration of iron (III) which was measured by atomic absorption spectrophotometer. As the result of the research, it was found that Fe-Oksinat was extracted optimally at pH 3, the concentration of iron (III) concentration of 10 ppm and oksin 0.12 M, with a 40-minute standing time and agitation time 20 min. Fe-oksinat for benzene solvent extracted optimum pH 3, the concentration of iron (III) concentration of 10 ppm and 0.12 M. oksin with a 20-minute standing time and mixing time 10 minutes. From the comparative figures of the comparison distribution at the optimum conditions for the three solvents (chloroform, ethyl acetate and benzene), it was obtained that the best solvent for the extraction of iron (III) with oksin as a completing agent is chloroform. Key words : solvent extraction, organic solvents, oksin, Iron (III)
JENIS-JENIS ALGA EPILITIK PADA SUMBER AIR PANAS DAN ALIRANNYA DI KAWASAN CAGAR ALAM RIMBO PANTI KABUPATEN PASAMAN Widiana, Rina; Abizar, Abizar; Wahyuni, Sri
Jurnal Sains dan Teknologi Vol 3, No 2 (2011)
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Epilitik algae is part of perifitik microalgae which live by sticking on any subtracts such as; rock, coral, and other solid material under water.  Algae has green pigment which is called chlorophyll so it can do photosynthetic.  Some epilitik algae can adapt in his living place.  Cyanophyta is one of algae which lives in any type of habitas such as; pond, stream even land.  It can live in middle or extreme temperature.  Thus this research was conducted for any kind of epilitik algae in hot water source and its stream in Rimbo Panti reservation in Pasaman.  The research was conducted on June 2010 in survey method.  The sample was identified in Biology laboratory of Biology department in STKIP PGRI West Sumatera.  The concentration measuring of sulfur, nitrogen, and phosphate was done in water laboratory of environment technique department of technical faculty of Andalas university Padang.  The parameter which was used are species. Iden-tification key, description, photo specimen, temperature, pH, the concentration of sulfur, nitrogen, phosphate, and dissolved oxygen (DO).  It was found that there are 11 kinds of epilitik algae where three are categorized as chrysophyta division and eight as Cyanophyta.  In the first station there were 3 epilitik algae and 9 epilitik algae at the second station.  The major species which were found in 90o C are Navicula tenella, Ropalodia gibberula and Oscillatoria minima.  Thus, it was found that the total number of species in each station is different.  Epilitik algae was mostly found in hot water source and only few of them was found in its stream.Key words: epilitik algae, hot water source
STUDI KOPRESIPITASI Zn2+ DAN Co2+ MENGGUNAKAN Al(OH)3 SEBAGAI KOPRESIPITAN Dewata, Indang
Jurnal Sains dan Teknologi Vol 5, No 1 (2013)
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Research of study copresipitation Zn2+ using Al(OH)3 as coprecipitant has been done. This study aims to determine the optimum conditions for coprecipitation of Zn2+ by Al(OH)3, and influence of foreign ions. This study uses variation pH about 5,0 – 10,0 and 6,0 – 10,0 for Co2+;  variation of eluent volume about 8,0 – 14,0; variation of concentrated HNO3 volume about 1,0 – 5,0; and variation of concentration Cu2+ and Ni2+ about 0,8; 1,2; 1,6; 2,0 and 2,4, respectively. Measurement concentration of Zn2+ using Atomic Absorption Spectroscopy (AAS) with wavelength of  213,9 nm Zn2+for 240,7 nm for Co2+. The result showed the optimum conditions occur at pH about 8, 12 mL of eluent and 1 mL of concentrated HNO3 with the absorption capacity of 0,074 mg/g for Zn2+ and pH about 8, 12 mL of eluent and 1 mL of concentrated HNO3 with the absorption capacity of 0,0905 mg/g for Co2+. Meanwhile, the presence of foreign ions such as Cu2+ has influenced the coprecipitated Zn where concentration of the coprecipitated Zn decreased with increasing the concentration of foreign ions.Keywords:  coprecipitation, coprecipitant Al(OH)3, trace metal,  Zn, Co, AAS
PERMODELAN ARSITEKTUR ENTERPRISE SISTEM INFORMASI MENGGUNAKAN ENTERPRISE ARCHITECTURE PLANNING Rinel, Ovel
Jurnal Sains dan Teknologi Vol 4, No 1 (2012)
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STAIN Batusangkar is oldest and require the support of information and communication technology tools in large quantities. It is necessary for procurement planning and management systems are integral and better. This study aimed to examine the overall architecture for business processes that exist in STAIN Batusangkar using enterprise modeling systems. The steps of modeling using EAP architecture is divided into two phases, namely the identification of enterprise and enterprise architecture development. Identification entreprise by defining the organization as an object to describe the vision and mission of the organization associated with the vision of information systems planning. This is done for the development of the campus architecture tailored to the business objectives. The results showed that the necessary framework of policy, strategic planning, organizational development concept of unit information and communications technology management, user management, network infrastructure and integrated information systems. Thus, we can conclude enterprise architecture modeling using enterprise information systems architecture planning can be used to assess the overall architecture of the existing business processes in STAIN Batusangkar using enterprise modeling systems. Key words: model enterprise architecture planning, STAIN Batusangkar
ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI KEBERHASILAN AKADEMIK MAHASISWA STAIN BATUSANGKAR Kurnia, Lely
Jurnal Sains dan Teknologi Vol 3, No 2 (2011)
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This research was focused on studying the factors influencing the students’ learning outcome, especially for the students of science Department of STAIN Batusangkar. The dependent variable was GPA that reflects the students’ learning outcome. The GPA data were categorized into “fail” (GPA<2.75), and “successful” (GPA≥2.75) that analyzed by using logistic regression and loglinear model. The respondents of this research were 339 students from Math, Physic and Biology Departmen who registered in 2008 - 2010 academic year. The logistic regression analysis showed that there were 3 factors that influence the students’ learning outcome significantly; their village, UN mean score and major in high school. The data analysis indicated that the students graduated from Islamic High School had a bigger chance to succes than students from Vocational School. UN mean score also can reflect the academic ability of the student significantly and the approriate major in high school (Science Studies) gave contribution to the students’ comprehension. By using loglinear analysis, it is gotten that association effect/ interaction between dependent variable and other variables as controller. The significant variable interaction was the second interaction between the school and the major chosen, while the third interaction has between UN mean score, major, and the school. Keywords: students learning outcome, logistic regression, probability, loglinear models
DESAIN ALAT HITUNG KECEPATAN SUDUT BERBASIS SENSOR MAGNETIK FLUXGATE Yulkifli, Yulkifli; Anwar, Zul; Djamal, Mitra
Jurnal Sains dan Teknologi Vol 2, No 1 (2010)
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This paper explains the design of angular velocity apparatus (Gyrometer) base on fluxgate sensor. The design of sensor elements consists of the double secondary coil (pick-up) and excitation coil with 10 layers, core layer is put into the isolative cavity. Fluxgate magnetic sensor works based on the principles of second harmonics, the intensity of magnetic fields proportional to the output sensor voltage. Based on data analysis on to sensor characterization it was obtained that the sensitivity 4.52 mV/μT, ±20 μT in ranges.  The maximum absolute error obtained from polynomial function approach in 0.53 μT and the relative error is 1.3% on magnetic fields ~19 μT. In this research the sensor can measure the frequency in the maximum absolute and relative  error 0.68, 0.58, 0.17, 0.71 and 0.026%, 0.022%, 0.006%, 0.021%, whereas the disc magnet with the number of magnet 2, 4, 8 and 16 respectively.Key words: angular velocity, fluxgate sensor, coil, second harmonic
APLIKASI COMPUTER VISION PADA KUALITAS KEMATANGAN BUAH Agustiyanto, Frans Rizal
Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
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This paper introduces the computer vision with the comparison of color methods to classify the variants of fruit (tomatoes, chilies, and apples) which is based on the level or stage of ripe.  The color comparison method is quite simple; the tomato images captured by the camera (CCD) will be cropped partly. Then its characteristic color will be extracted and the color grade level will be calculated. The calculation of R (red), G (green) and B (blue) and the transformation of the color to Hue, Saturation, and Value was conducted in order to classify the fruit maturity. Thus, the ripe can be classified into 3, namely Ripe, Half-Ripe, and Un-ripe (not ripe). On contrary, over-ripe cannot be classified because the characteristics of the color is similar with the ripe tomato but the skin texture is slack, so it is not enough to characterize the color used to draw conclusion of being Over-ripeKey words: image processing, computer vision, RGB, HVS
PEMAKAIAN PREBIOTIK UBI JALAR KUNING (Ipomoea batatas L) DAN PROBIOTIK Lactobacillus casei PADA PEMBUATAN SUSU FERMENTASI SINBIOTIK Fajar, Najmiatul; Indriati, Gustina
Jurnal Sains dan Teknologi Vol 2, No 2 (2010)
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This research study about use of prebiotic Ipomea batatas L. and probiotic  Lactobacillus casei at milk fermentation. The usage of simbiotic increase, recentely, especially, for husbandarys products, such as milk fermentation the purpose of this study was to find out the best composition of prebiotic  Ipomoea batatas L and probiotic Lactobacillus casei given in the process of simbiotic milk fermentation. The method used for this experiment was random cluster, factorial 4 x 3 with 3 times of re-treatment, and was analyzed with BNT and BNJ testing. “A” factor was the use of prebiotic Ipomoea batatas L. (0%, 7,5 %, 15 %, 22,5 %), and “B” factor was the use of probiotic Lactobacillus casei (2%, 3%, 4 %) the component measure were BAL , water and TTA the result of this study was shown that the best use of prebiotic Ipomoea batatas L and probiotic Lactobacillus casei in the process of symbiotic milk fermentation were in the composition of highest BAL : 21,40 x 108 cfu/ml. the highest TTA and water were 0,21 % and 71,98 22,5 %  of prebiotic Ipomoea batatas L.  and 4% probiotic Lactobacillus casei consentrate. Key words: prebiotic, Ipomea batatas L., probiotic,  Lactobacillus casei, milk fermentatio

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