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INDONESIA
Sainstek
Published by Universitas Negeri Padang
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Articles 28 Documents
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APLIKASI LOGIKA FUZZY UNTUK PERAMALAN BEBAN LISTRIK JANGKA PENDEK MENGGUNAKAN MATLAB Effendi, Hansi
Sainstek Vol 12, No 1 (2009): Vol. XII No. 1, September 2009
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

This research is conducted to apply Fuzzy Logic which is implemented in short term load forecasting. Data that is used for short term load forecasting are historical load data and temperature data. The data is analyzed to learn the load characteristic of Sumbar System which is used as references for making rules in Fuzzy Logic. The Fuzzy Logic model is made using fuzzy logic toolbox that is provided by Matlab. The forecasting result is compared with actual load. It is seen from experiment that the advantage of Fuzzy Logic is its rules that are made from supplied data. Keyword :       Fuzzy Logic, load forecasting, rules.
Karakteristik Morfologi dan Genetik Tanaman Penghasil Gaharu (Aquilaria spp) Endemik Sumatera Barat Satria, Benni; Gustian, Gustian; Swasti, Etti; Kasim, Musliar; Darnetti, Darnetti
Sainstek Vol 11, No 1 (2008): Vol. XI No. 1, September 2008
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

Agarwood (Aquilaria spp) is plant of tha important tropical forest trees,which produces a high economically valuable fragrant resinous wood. The objective of this  study was to characterize  the agarwood based on  morphologist are  genetic distance using RAPD markers. Characterizeof the agarwood based on morphologist and genetic distance by using RAPD markers is on alternative method to see variance morphologist,genetic and condition population plant agarwood (Aquilaria sp) endemic West Sumatra. This experiment was conducted at rain forest West Sumatraand  Laboratory Agronomy Agriculture faculty Andalas University, and Laboratory Biotecnology Seameo Biotrop Bogor, during mar 2006 toDecember 2007.The result showed two group mayor cluster to agarwood i.e. Aquilaria malacensis  and Aquilaria microcarpa endemic West Sumatra by using fenotipe variabilities and RAPD markers. Broad genetic variabilties were found for long and wide leaf width. Keyword : morfologist, genetic, Agarwood, and RAPD.
PENGARUH PUTARAN MESIN TERHADAP EMISI GAS BUANG HIDROKARBON (HC) DAN KARBON MONOKSIDA (CO) Fernandez, Donny
Sainstek Vol 12, No 1 (2009): Vol. XII No. 1, September 2009
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

Result of research indicate that at level of significanti 5%, (1) machine rotation have an effect on significant to gas emission throw away HC with percentage of contribution 98,90%. Where its tendency of machine rotation excelsior hence gas emission throw away  HC progressively. Gas emission throw away  the lowest HC obtained by rotation 2200 that is 153 ppm. (2) Machine rotation have an effect on significant to gas emission throw away CO with percentage of contribution 91,60%. Where its tendency of machine rotation excelsior hence gas emission throw away CO progressively. Gas emission throw away the lowest CO obtained by rotation 1800 that is 0,20%. Keywords : machine rotation, gas emission, hidrocarbon (HC), carbon monoksida (CO)
INULIN SEBAGAI PREBIOTIK Azhar, Minda
Sainstek Vol 12, No 1 (2009): Vol. XII No. 1, September 2009
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

Inulin is natural polymer belong to a class of carbohydrates. Inulin has effect the best of prebiotic. Inulin is fermented by Bifidobacteria and Lactobacilli quictly and easy. Major product of  fermentation is short chain fatty acids (SCFA) and L-laktate.  SCFA is an important function of the large intestine. SCFA influence immune function, heart health, cancer prevention. SCFA decrease colonic and faecal pH, so support growth of Lactobacilli and Bifidobacteria, inhibits growth of patogen bacterial. SCFA can influences metabolism of lipid and glucose. Inulin can increase absortion of Ca, Mg and Fe. Key words :    inulin, prebiotic, probiotic, SCFA
Ketahanan Membran Komposit Khitosan/ Polisulfon Terhadap pH Haryati, Sri; Erna, Maria
Sainstek Vol 11, No 1 (2008): Vol. XI No. 1, September 2008
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

It has been done the resistance test of chitosan/polysulfon composite membrane toward of  solvent. Result showed that composite membrane  was resisted to pH of 5.5. It was indicated by the highest swelling percentage, that is 75.48%. These result were supported by porous photo membrane using SEM that is across-section , up surface and bottom photo  showed that happed change porous structure membrane but structure tying membrane can not experiencing of damage. Keyword : composite membrane, chitosan,swelling percentage
Penentuan Interval Waktu Penggantian Optimal Komponen Berdasarkan Model Opportunity Based-Age Replacement Giatman, Muhammad
Sainstek Vol 11, No 1 (2008): Vol. XI No. 1, September 2008
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

Maintenance system, especially replacement that is not good, can cause much lose out for the company. The lose out is caused production process disturbing bay unexpectadly or unscheduled replacement. This will lose out for factory that have continue flow shop type, because replacement of the component that is need shut down machine will cause all machine in the process production stop. To anticipate of lose out that cause by replacement activity, so in this research will search interval of optimal time replacement that is can minimizing total cost of replacement especially for Bearing Pinger component in machine washer by using Opportunity Based-Age Replacement model. In Opportunity Based-Age Replacement model, Bearing Pinger will change before age-economic has done by using firs opportunity that is coming. The opprtunity is shut down production that has scheduled by PPIC department, and component replacement that have done in this opportunity not causing lose out because production process that stop expectadly. From the resul the manner of data has got total cost of replacement per hours that is leaved by Opportunity Base-Age Replacement model is smaller than total cost of replacement per hours by replacement bases on failure component that now is applied in PT. Coca Cola Bottling Indonesia-Central Sumatera. So, we get the conclusion that total cost of replacement for Bearing Pinger  of the company has decrease by using Opportunity Based-Age Replacement model. Keywords: Replacement, Optimal, Opportunity based age replacement, Preventive maintenance, Corrective maintenance.
BIODIVERSITY OF ARBUSCULAR MYCHORRIZAL FUNGI (AMF) ON POTATOS RHIZOSPHERE AND IT POTENTIAL AS BIOFERTILIZER Yelianti, Upik; kasli, Kasli; Kasim, Musliar; Husin, Eti Farda
Sainstek Vol 12, No 1 (2009): Vol. XII No. 1, September 2009
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

AMF as the biofertilizer on several crops  has been reported, but not so much the information about biodiversity of AMF on potatos rhizosphere and its potential to colonize that crop. The research about the biodiversity of AMF has been done in laboratorium  Biology in Faculty of Agriculture of Andalas University and in laboratorium Biotecnology of Agriculture Faculty of Jambi University from November 2004 till April 2005. The sample of soil have been collected from  rhizosphire of potatos plant in Alahan Panjang, West Sumatera, and then the AMF spore are isolated and identification based on morphology and size of spores. Inoculation of single and multi spores to potatos root to see the structure of colonization and percentage of colonization. The result of identification of AMF spores show that there are many kind of spores on rhizosphere of potatos plant and the spores are dominated by: Glomus, Acaulospora, Scutellospora, Gigaspora, and Enterophospora. Unfortunately, the inoculation of single spore has no good effect to the structure of colonization and the potatos plant not vigorous and easy to be severe of stem desease. But, inoculation with multi spores show that the tipe of colonization on potatos root have the coil hyphal and intracellular vesicular. The same result also indicated that colonization with active propagule (mycelium, spores, and infected root) have the coil hyphal and intracellular vesicular. The species of AMF that have the typical characteristic is assumed as Gigaspora sp.. Key words :    AMF, potatos rhizosphere, biofertilizer
Kajian Parasitoid: Eriborus Argenteopilosus Cameron (Hymenoptera : Ichneumonidae) pada Spodoptera. Litura fabricius (lepidoptera : Noctuidae) Nelly, Novri; Yaherwandi, Yaherwandi; Gani, S.; Apriati, Apriati
Sainstek Vol 11, No 1 (2008): Vol. XI No. 1, September 2008
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

Study of parasitoid Eriborus argenteopilosus Cameron (Hymenoptera : Ichneumonidae) on S. litura Fabricius (Lepidoptera: Noctuidae) was conducted in laboratorium Entomology Departement Plant pest and desease Faculty of agriculture, Andalas University in January to March 2006. The study was used biological assay methode to known parasititation and potential fecundity of  parental parasitoid. The result showed that fluctuation parasititation (63 - 17,99 %) and superparasitisme (36,67 - 3,33%) E. argenteopilosus on S. litura Potential fecundity of E. argenteopilosus 182,3±72 and potential release  73,7±49 eggs. The survival of parental adult  E. argenteopilosus only 6 days in laboratorium. Key words : E. argenteopilosus, Parasititation,  S. litura
ANALISA UMUR EKONOMIS UNTUK MENENTUKAN WAKTU PEREMAJAAN YANG OPTIMAL BAGI MESIN MOULDING Giatman, Muhammad
Sainstek Vol 12, No 1 (2009): Vol. XII No. 1, September 2009
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

PT. Andalas Lumber Products is a company engaged in manufacturing semi-finished wood (sawn timber). The company's success in serving customer demand on time is determined by the readiness of the facility in carrying out its functions. One of the main engine is a molding machine is the machine used for the finishing process. The ability of these hourly Moulding machine is 600 m / hr working hours per day 7 hours, so if the machine does not operate in a single day because of damage to the business may experience a loss of 4200 m / hour. This machine consists of three units of the machine, which was 9 years old, in theory the economic life of 10 years for type machine Unimat 23E and 22N Profimat 8 years. This category of critical engine unit, therefore it is necessary that good maintenance schedule and a schedule of renovation that is right for the machine. In this research study and analysis of economic life cycle through the calculation of the estimated operating expenses, depreciation calculations, and determination of the cost of return on capital (capital recovery cost) by using an interest rate of 10%. Replacement schedule will be taken through the smallest total cost is considered as the economic life of the machine where the costs incurred is minimum. From the results obtained by processing data from the smallest total cost of Rp molding machines I 157,240,725.3 with economic life in its 7th year, molding machine II of Rp 112 551 903 with the economic life of Rp 156,391,605.3 the economic life of the year-to-7. With both types of machines are economical replacement should have been done. Key words : Economic life-cycle, Capital-Recovery, Replacement
PENDETEKSIAN BATAS-BATAS ZONA STEAMFLOOD MENGGUNAKAN DATA ANOMALI GAYABERAT-MIKRO 4D YANG DIBERI KONSTRAIN Fauzi, Ahmad; A. Kadir, Wawan Gunawan; Dahrin, Darharta; Santoso, Djoko
Sainstek Vol 12, No 1 (2009): Vol. XII No. 1, September 2009
Publisher : Lembaga Penelitian Universitas Negeri Padang

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Abstract

Recently, the oil industry has emphasized enhancement oil recovery (EOR) process. The steamflood are ones EOR process can used to increase the heavy oil production. Effective management of EOR process requires detailed reservoir description and observation of the reservoir being swept at time. The 4D microgravity method can be applied in obtaining reservoir description such as steamflood zone mapping. Combination between the rock physics analysis with ideal model of steamflood used to calculate the synthetic 4D microgravity anomaly. This result suggest the negative 4D microgravity anomaly changes at time represented steamflood zones causes by density contras between steam at the high temperature after injection and pressure with heavy oil at the low temperature and pressure before injection. But the 4D microgravity anomaly can’t detect steamflood zone boundaries causes the anomaly shape with respect to shape of source. We proposed the 4D microgravity anomaly constrained with high resolution horizontal derivative to detect steamflood zones boundaries. The field data showed gravity change of up to -300mGal have occurred in area near ones the oil production well.  The maxima value of the field constrained 4D microgravity anomaly represented the steamflood zones boundaries with its surrounding. Key Word :     EOR process, steamflood, rock physics analysis, the constrained 4D microgravity anomaly

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