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<![CDATA[PENERAPAN PENEMPATAN NILAI EIGEN INFINITE SISTEM SINGULAR PADA PENYELESAIAN PERSAMAAN POLINOMIAL MATRIKS BERBENTUK [Es – A] X + B Y = U(s) ]]>
<![CDATA[Suryowati, Kris]]>;
<![CDATA[Setyawan, Yudi]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 1 Agustus 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v5i1.512
<![CDATA[Problem of solvability of polynomial equations and matrix eigenvalue relation to the placement of an infinite state-feedback is important to learn because it deals with the properties of dynamic and static systems. In this case discussed the problem with putting the infinite eigenvalue decomposition of the standard, then the results are applied to problem solving matrix polynomial equations. On eigenvalue placement or placement of the poles, the problem is determining the state feedback matrix K such that det [Es - A + BK] = a ≠0, in a and s with each other independent. Singular linear system that has an infinite eigenvalue will be formed in such infinite eigenvalues ​​are placed so that the system has no eigenvalues ​​of infinite state by providing appropriate feedback. Problems on infinite eigenvalue assignment can be attributed to the determination of polynomial equation solution in the form of matrix [Es - A] X + BY = U(s) for a matrix U(s) with detU(s) = a, so that necessary and sufficient conditions of]]>
<![CDATA[PENINGKATAN DAYA PADA PEMBANGKIT LISTRIK MIKROHIDRO (PLTMh) DI DAERAH IMOGIRI BANTUL JOGJAKARTA ]]>
<![CDATA[Suyanto, Muhammad]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 1 Agustus 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v5i1.513
<![CDATA[In rural areas there is generally a major irrigation canal that serves to irrigate the fields and also has the potential to be used as power plants. Developments Wukirsari Imogiri Bantul area, an agricultural region and its inhabitants have a side job as grate the coconut and make various handicrafts for souvenirs that use raw materials from a particular timber. Development of today's technology provides a variety of environmental impacts, both positive and negative, in the presence of micro hydropower plant in one of the villages in the area Imogiri will certainly add a positive impact for local communities. In the presence of micro-hydro, if night can be used as a means of public street lighting so that security and a sense of anxiety at night reduced incomes and to increase trade group be established to process the materials of wood and iron to take advantage of wood-working equipment that require electricity results from the existing micro-hydro power, yet still very limited relative kapisitasnya. Side activity that utilizes peratan carpentry can not be fulfilled using electricity from existing plants.Therefore we need an increased effort on Micro Hydro Power (MHP) is still very limited relative power. So in this study, is expected to obtain an increase in power can be realized with both and can obtain results in line with expectations.]]>
<![CDATA[MODELLING AND NN CONTROL OF A TWO-LINK FLEXIBLE ROBOT MANIPULATOR ]]>
<![CDATA[Khairudin, Mohammad]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v4i2.514
<![CDATA[This paper presents investigations into the development of neural network (NN) control of a two-link flexible robot manipulator with load 0.5 kg. A dynamic model of the system is derived using a combined Euler-Lagrange and assumed mode methods (AMM). The controller reduces nonlinearities problem that can be efficiently solved using NN control. The system responses namely hub angular position and deflection responses and end-point acceleration at both links are obtained and analysed. The performances of the controllers are assessed in terms of the input tracking controller capability of the system. Moreover, the robustness of the NN control schemes is discussed. Finally, a comparative assessment of the control strategies is presented. The results show that NN controller performs give increasing profiles that compared with PID control.]]>
<![CDATA[KONDISI KEAIRAN SUMBER AIR PANAS PARANGWEDANG DI DAERAH PARANGTRITIS KECAMATAN KRETEK KABUPATEN BANTUL DAN ARAHAN PENGEMBANGAN UNTUK PARIWISATA ]]>
<![CDATA[-, Miftahussalam]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 1 Agustus 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v5i1.515
<![CDATA[The objective of research is to determine the inundated condition of Parangwedang Hot Spring Resources and provide to support tourism development. Methods of research was conducted by field research, source water sampling of Parangwedang Hot Springs and laboratory analysis.Lithology of study area is composed by Tertiary volcanic rocks, carbonaceuos clastic sediments and Quarternary alluvial deposits. Based on hydrogeological condition, known that study area has potential hot spring water. Based on geological analysis, and the study of Parangwedang Hot Spring known that resources is a remnant of palaeomagmatism during Tertiarry. In the basis of physics, chemistry and limited microbiology analysis, Parangwedang Hot Spring might be applied to toursm development, such as thermal baths. In order Parangwedang Hot Spring Resources to be a main tourist destination in Parangtritis area, the government of Bantul Regency should be improved to promote it and collaborate with their sponsorship, in increasing its tourism management.]]>
<![CDATA[PRODUKSI MINYAK BIJI KAPUK DALAM USAHA PEMAN FAATAN BIJI KAPUK SEBAGAI SUMBER MINYAK NABATI ]]>
<![CDATA[Yuniwati, Murni]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v4i2.516
<![CDATA[Kapok tree (Ceiba pentandra) is a member of small class Malvales, family Malvaceae. The plant is native to the shout America, Central of America and Caribia. It grow well at the tropical region. In fact the kapok seed contains fatty acid with higher economic value which is called kapok oil. Oil of kapok seed can be obtained from solid-liquid extraction methode. In this investigation, the extraction of kapok seed was carried out in the stirred tank with ethanol as a solvent. Extract was distilled to separate kapok seed oil from solvent. The variable of investigation were extraction temperature , stirring speed, ratio between solvent volume and mass of kapok seed , and size of kapok seed. Tthe extracted oil was analyzed by using gas chromatography to determine the fatty acid composition. The optimum condition of kapok seed extraction were obtained at boiling point of ethanol ± 78 oC, stirring speed 400 rpm, ratio between solvent volum and mass of kapok seed is 16mL: 1gr, and size of kapok seed (-30 / 40 ) mesh or average diameter 0,065 cm. The corelation between mass transfer coefficient and these variables is shown in the dimensionless equation below : Sh = 0,132 Re(0,5004). Sc 0,651. with the average error 0,95 %]]>
<![CDATA[OPTIMALISASI PEMANFAATAN BIJIH NIKEL KADAR RENDAH DENGAN METODE BLENDING DI PT. ANTAM Tbk. UBPN SULTRA ]]>
<![CDATA[-, Musnajam]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v4i2.517
<![CDATA[Nickel ore is in the region Pomalaa, including the type formed by lateritic weathering of ultramafic rocks (peridotite, serpentine) mineral-rich olivine ((Mg, Fe) 2SiO4) and piroksin (AB Si2O6), The study was conducted to determine the handling and utilization of low grade nickel ore is carried out by PT Antam Tbk. UBPN Southeast Sulawesi. From the research, found that the amount of tonnage of low grade nickel ore (COG <1.8% Ni) compared with high-grade nickel ore (COG> 1.8% Ni). It requires handling as well as on the optimal utilization of low grade nickel ore, which in turn will support the survival of the company.]]>
<![CDATA[FANALISA KEBUTUHAN KALSIUM KARBID PADA PROSES DE-SULFURISASI PEMURNIAN NIKEL FENI II PADA PT ANEKA TAMBANG, TBK UBPN SULTRA PROVINSI SULAWESI TENGGARA ]]>
<![CDATA[Rembah, Rina]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 1 Agustus 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v5i1.518
<![CDATA[Aneka Tambang Tbk UBPN SULTRA was the once company of nation under order of BUMN (Badan Usaha Milik Negara) consentration in mining nickel, in place At Kecamatan Pomalaa, Kabupaten Kolaka South East Provence. Two factory was operated since 1975 with capacity 11.000 ton nickel/year, however once factory was builded since 1995 with capacity 24.000 ton nickel/year and after that production since 2004 with cost assumption 200 U$$. One of step process smelter to up the ferronickel grade is refining process. And to down sulfur grade in product so that accept standart product in market ≤ 0,03%, that do it de-sulfurisasi process. The problem in refining process specialy de-sulfurisasi refining is over consumption calcium cabid, long time process that down the temperature and grade in product not accept in international market.From result of calculated consumption calsium cardib for de-sulfurisasi proces as we know that rate consumption for assosiated 1 kg sulfur need 3, 69 kg calsium cardib. And to reduce consumption between planning and realitation is 40,39 kg/tapping proces. Rate temperature need is 2oc/minute for once tapping proces and need time to proces is 37 minute.rate Down temperature for once proces is 74,2oc, rate of consumption calsium carbid pertapping is 489,6 kg. Factor’s efect in comsumption calsium carbid is condition of ladle, temperatur,stirer condition, mechanisem into material in ladle and specialy of operator.]]>
<![CDATA[KAJI EKSPERIMENTAL KARAKTERISTIK ALIRAN EKSTERNAL PADA BENDA TUMPUL SEGIEMPAT DENGAN UJUNG MUKA ELLIPS ]]>
<![CDATA[Subagyo, Rachmat]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v4i2.519
<![CDATA[Aerodynamic equilibrium at the vehicle can not be separated from the presence of flow separation and drag force that occurs, and is a great loss that can affect the use of waste fuels. Many ways to minimize the drag force that arises when a body drained of fluid flow, one of which is to control the boundary layer on the surface of the object or to modify the shape of the object. In this research using wind tunnel aerofoil as a tool to tes while the test object is made using teak wood in the form of ellipse as much as 5 pieces. The surface of the test object is made smooth and varnished.The results are: AlphaThe smaller the drag coefficient with the increasing Reynolds number and variety of the major axis (a) on the test object, and conversely the smaller the value of the Reynolds number and variety of the major axis is smaller drag coefficient. With different Reynolds numbers show almost the same pressure distribution of the five test specimens except the specimen 75 mm major axis variation of this happens because the influence of the capillary tube. The greater the radius of curvature or the greater variation the separasion nough major axis can be delayed can be seen in the figure based separasi point (b / a) for the fifth test object that the separation point can be delayed due to the fluid flowing in the test specimen experienced less resistance because of its shape more taper than another test.]]>
<![CDATA[RE-INISIASI DETONASI DI BELAKANG PLAT DENGAN ORIFIS GANDA 7 MM ]]>
<![CDATA[Naryanto, Rizqi Fitri]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v4i2.520
<![CDATA[Detonation waves are the combustion reaction waves that propagate at supersonic speeds. The phenomenon of detonation waves that have failed due to the diffraction process which can re-initiatited was back into a detonation wave, interesting to understand that this problem related to the safety of hydrogen gas. This study aims to understand of failure mechanisms and re-initiation of detonation wave behind the plate with double orifices 7mm. This experiment use a Detonation Test Pipe (DTP) with 6 meters length, DTP is divided into two parts, namely 1 meter for the driver test pipe and 5 meters to the driven test pipe. Aluminum plate with double orifices diameter of 7 mm and the distance between the orifices 14 mm,10 mm thickness on the driven test at 5 meters distance from the ignition point. Two mechanisms re-initiation behind the detonation wave propagation test models can be classified as follows: (1) Re-initiation detonation by DDT in down stream area. (2) Re-initiation detonation by shock-wall, re-initiation detonation by interaction between wall pipe and shock wave. Quenching detonation (deflagration) observed at initial pressure of 20kPa, while the initial pressure of 30 - 60kPa re-initiation detonation occurred in the presence of DDT process in the downstream. Re-initiation detonation wave due to interaction between shock wave with the inner wall pipe occurs at the initial pressure of 70-100kPa characterized by the formation of fine smaller detona-tion cells. To guaranty to make quenching detonation (deflagration), pressure must be in the low pressure at 20kPa to design detonation arrester.]]>
<![CDATA[DESAIN TRAFO CORELESS MENGGUNAKAN VIZIMAG ]]>
<![CDATA[-, Uminingsih]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v4i2.521
<![CDATA[This paper describes a simulation of coreless transformer design using Vizimag which is a software application tool for computation based on finite element method. The objective of this research is to study the effect of the coreless transformer parameters through the secondary output voltage such that it is hoped the optimal design to be achieved. Method is done by determining parameters which affect to coreless transformer such as frequency and coupling coefficient as variable to be simulated. Primer of transformer has diameter and height of solenoid of 50 cm and 30 cm with 11 winding, input voltage of 20 kV where as secondary of transformer has diameter and height of solenoid of 194 cm and 40 cm with 970 winding, these all are determined as constant parameters. The results of simulation show that the placement of primer solenoid in the secondary solenoid affects deeply to secondary voltage and to coupling coefficient. In addition frequency affects deeply to secondary voltage where by increasing the frequency it will increase secondary voltage until reaching optimum voltage. In position of primer solenoid in the centre of secondary solenoid and frequency higher than 90 kHz, the optimum simulation design of coreless transformer is achieved which are secondary voltage of 489 kV, coupling coefficient of 28,4%, and overall power efficiency of 0,71%.]]>
