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Semesta Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 1411061X     EISSN : 25025481     DOI : https://doi.org/10.18196/st
Core Subject : Engineering,
Engineering
SEMESTA TEKNIKA is a reputable refereed journal devoted to the publication and dissemination of basic and applied research in engineering. SEMESTA TEKNIKA is a forum for publishing high quality papers and references in engineering science and technology. The Journal is published by the Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, INDONESIA. Copyright is by the publisher and the authors. The Journal is issued in electronic form and also issued in printed form as annual volume for the contributors only. The journal contains original research papers, review articles, short notes and letters to the editors. The topics of interest include modeling, experimental, analytical and numerical investigations on the mechanical, physical, chemical and mineralogical properties of material, developing the prototype/instrument, technology and construction process. Topic of management in industry and civil construction is also considered. SEMESTA TEKNIKA receives manuscripts from the contributor written in the Indonesian and English. Manuscripts submitted to the journal for publication must not have been previously published or is under consideration simultaneously by any other publication. Manuscripts submitted to SEMESTA TEKNIKA will be reviewed Peer Reviewers local and foreign.
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Articles 10 Documents
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Search results for , issue " Vol 17, No 2 (2014): NOVEMBER 2014" : 10 Documents clear
Klasifikasi Wajah Kambing Peranakan Ettawa (PE) Jantan Berbasis Perseptron Chamim, Anna Nur Nazilah; Soesanto, Adhi; Soesanti, Indah
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Goat Peranakan Ettawa ( PE ) is a kind of superior goat derived from goat crosses, between Ettawa (Jamnapari ) from India and Kambing Kacang (Bean Goat) from Java. A factor to determine quality of goat PE is it’s face. More than 30 cm ears length and the head color is black represents good quality. More better the quality of goat face, means higher selling price. In this study, male goat face is classified into class good quality, less good, and not good at data such as photo / image In the market, classification done by visual observation, so many farmers have difficulty in classifying the face of a goat. For that purpose, a system is needed that capable for classifying a goat face to facilitate farmers in classifying.This classification system uses Perceptron Method, is a method of guided learning using characteristic as input those are ears length, black value and brown face value. Images are used as training images as much as 9 images, and test images are 20 images. This system could classificating PE goat face with success rate of 95% and 1 error from 20 testing images. Error occured because the background was detected as black and image taking that not precise.
Sifat-sifat Tarik dan Flexural Komposit Serat Sabut Kelapa Unidireksional/Poliester Sudarisman, Sudarisman; Kamiel, Berli P; Rahadi, Slamet
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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The purpose of this study is to investigate the tensile and flexural properties of unidirectional coconut fiber/polyester composite materials, and to describe their failure modes. Specimens were cut from fiber/polyester composite plates containing various fiber contents. Materials being used in this study are coconut fiber that was previously alkali-treated and polyester resin matrix. Whilst tensile testing was carried out in accordance with the ASTM D3039 standard, flexural testing was based on the ASTM D790 standard. Failure surfaces of the representative specimens were then observed under an optical microscope, and their digital photo macrographs were captured for image analysis in order to describe their respective fiber distribution pattern and to determine their respective actual fiber volume fraction, Vf, by means of an open source software called ImageJ. It was found out that the actual Vf of the four composite plates being produced were 10.7%, 17.6%, 27.4% and 40.5%. It was revealed that while tensile strength increases with the increase of Vf, while failure strain, modulus elasticity and flexural strength decreases. The average highest tensile strength, tensile failure strain, and tensile modulus of elasticity were found being 30.01 MPa at Vf = 40.5%, 0.027 mm/mm at  = 0%, and 1.47 GPa at Vf = 0%, respectively. The average highest flexural strength, failure strain and modulus of elasticity were observed being 153.92 MPa at Vf = 10.7%, 0.0358 mm/mm at Vf = 0%, and 3.242 GPa at Vf =10.7%, respectively. It was observed that specimens were failed by fiber pull out and debonding.
Analisis Drainasi di Saluran Cakung Lama Akibat Hujan Maksimum Tahun 2013 dan 2014 Harsanto, Puji; Lesmana, Surya Budi; Devianty, Sherly
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Flooding is an annual disaster for Indonesia. Jakarta is a city that each year nearly always experienced by flooding. The rapid development made the impervious area dropped drastically. Micro drainage is not capable of passing the volume of direct runoff. It makes many regions in Jakarta experienced by floodwaters. The aim of this research is to analyze the micro drainage capacity in Cakung Lama River. Simulations are performed with HEC-RAS 1D. The flood data is maximum rainfall on 2013 and 2014. Two scenarios normalization is done for reducing the inundated area around the river. Based on the simulation results, the existing conditions are not able to accommodate the discharge due to maximum rainfall 2013 dan 2014. Normalization of the river will give good results if the width of the river 5 m and the depth of the river is 3 m.
Minimalisasi Jumlah Tiang dalam Group Pile Melalui Pemilihan Bentuk Dasar Penampang Pondasi Tiang pada Tanah Lempung Isnaniati, Isnaniati; Riduwan, Riduwan
Jurnal Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Having very small coefficient of seepage, wide clog, , soil bearing capacity is very low., create the complexity of clay. The pole foundation is what frequently used in clay. Mostly the hard layer of clay soil is far lying under ground along with the rare use of hexagonal foundation which had widely been circular and rectangular. Minimizing the pole in pile group is one of the alternatives to reduce the construction budget. By comparing the pole circle-basis, rectangular, and hexagonal section with variation of dimension 0.3; 0.35; 0.4m, an investigation to the number of pole in pile group based on SPT for vertical soil bearing capacity as well as lateral Brooms method at each cross-sectional shape of the pole is carried out. The results obtained shows similar diameter which finds the number of poles at least up to the highest, in the pile group is a consecutive sequence of rectangular cross-sectional shape of the first, second is a circle, and the third is a hexagon. The percentage of number of rectangular pole   78% from circular and 73% from hexagonal shape.
Analisis Waktu Pelaksanaan Proyek Konstruksi dengan Variasi Penambahan Jam Kerja Priyo, Mandiyo; Sartika, Sartika
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Time and cost greatly affect the success and failure of a project. Measure of the success of a project is usually seen short turnaround time at minimal cost without leaving the quality of result. Systematic project management is required to ensure the project implementation time in accordance with the contract or even faster that the cost could provide benefits. And also avoid any penalties due to delays in project completion. Purpose of this study is to calculate the change of cost and time of implementation project with variations additional hours of 1 hour to 4 hours of overtime by using microsoft project programs. And to compare the results between the cost of fines with changes in costs before and after the addition of working hours (overtime). The results of this study have shown that (1) The minimum project cost was obtained at the time of normal conditions without the addition of overtime hours Rp 25,923,636,641.50 while for the minimum time the project was obtained on the addition of 4 hours is 197.84 days of normal duration of 217 days with the addition of cost of Rp 215,838,008.94 from the normal total cost of Rp. 25,923,636,641.50 to Rp 26,139,474,650.44 (2) Additional hours worked best option is additional three hours of work, in this condition the costs Rp 139,469,427.19 with profits generated Rp 327 156 .032,35.
Pembuatan Alat Uji untuk Mengikat Partikel Logam yang Terkandung dalam Pelumas Akibat Gesekan Mesin Sukamta, Sukamta; Sudarja, Sudarja; Nurdarojat, Nurdarojat; Prasetyo, Agung
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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One of the factors that can affect to the quality of lubricantion is metal particle content due to friction of engine parts.  Metal particle in lubricanting oil could damage the engine parts, so it is neccessary to reduce the metal particle content which mingled in lubricant oil. The experiment was conducted in laboratory scale using power magnetic type ring neodymium possessing diameter of 19 mm and thickness of 2 mm. The experiment was conducted by flowing the lubricanting oil containing metal particle continually and put the magnets in engine so that the metal particle will be taken up by the magnets. The experiment used  three variations of time (5, 10 and 15 minutes) and three variations of valve to controlling the flow rate using. The highest  absortion of metal  particle was reached on opening valve 30 for 15 minutes. When volume the flow rate was 200 ml/s and the time was 15 minutes  the result of absortion was 7.48 % (magnet A), meanwhile for volume the flow rate 180 ml/s and the time was 15 minutes resulted in particle absortion of about 7.37 % (magnet B). When Magnet A and B used together and at the same flow rate and time, i.e. 180 ml/s time 15 minutes, resulted the particle absortion about 17.98 %.
Estimasi Lokasi Gangguan Hubung Singkat pada Saluran Transmisi Tenaga Listrik Syahputra, Romadoni
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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In this paper, a method for short circuit fault location estimation which uses data from both ends of overhead transmission line and which does not require the data to be synchronized is described. The method fully utilizes the advantages of digital technology and numerical relaying which are available today and can easily be applied for off-line analysis. The described scheme does not require real-time communications, only off-line post-fault analysis. The method allows for accurate estimation of fault location irrespective of fault types, fault resistance, load currents, and source impedances. The simulation for single line to ground fault and symmetrical three phase fault with the variation of fault resistance of 0 ohm, 10 ohms, 30 ohms, 50 ohms, 70 ohms, and 100 ohms, respectively. The simulation has been done by using Matlab software. The simulation results of estimation error are 0.296% for single line to ground fault and 0.112% for symmetrical three phase fault, respectively. The results have shown that the method can accurately estimate the location of short circuit fault on power transmission lines. 
Pengaruh Gaya Siklis Aksial-Torsial pada Model Simulasi Sambungan Pipa Apung Menurut Teori Gaya Dua Permukaan Sahlan, Sahlan
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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The two-surface theory consists of a yield surface and a loading surface, in which the surface may be defined diffrerently (axial and torsional). A Simulation experimental study on the inelastic behavior of tubular annealed alluminum alloy Alumina Duroll tubular specimens subjected to combined axial and torsional stress cycles is presented. Particular attention is paid to the question of how plastic strain is developed and how the yield surface moves along the 90o out-of-phase stress cycle for simulation model of floating hose. Experimental result agree qualitatively with the prediction of the two surface plasticity theory. This Research is based on case study research pipeline buoyancy (floating hoses)
Identifikasi Faktor Dominan Penyebab Kerentanan Bangunan Di Daerah Rawan Gempa, Provinsi Sumatera Barat Zulfiar, M Heri; Tamin, Tamin; Pribadi, Krishna S; Irwan, Iswandi
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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West Sumatra is one of the province in Indonesia owning high earthquake risk. Disaster data in last one decade show the existence of occurence of earthquake generating damage of building in gross. This matter indicate that building in West Sumatra susceptance of  earthquake. One of the building susceptance is management of construction which disagree with needed conditions, law and regulation goodness which in rough, and also execution of imprecise development, imprecise build, either from planning facet and scheme, execution and observation, and also from exploiting facet and treatment. It can make infrastructure and building susceptance of disaster. When disaster happened, construction sector product becoming not function, it will generate disaster victim, or generate big loss, because destruction of other infrastructure or building. Research identify dominant factor is building susceptance represent the part of research of dissertation in the effort to less of building susceptance ( mitigation) to earthquake, by :1) sekunder data analysis of building effect of earthquake 2) perception of building characteristic and practices build 3) interview to some construction expert and earthquake. Research location in six sub-province / disaster gristle town that is; Padang city, Padang Panjang city, sub province of  South Pesisir, sub province of Tanah Datar, sub province of Pariaman and west Pasaman. Research Object at building with floor lower and confined of un-confined masonry. To know potency cause of susceptance by triangulation and sintesis among the data, fact and opinion of expert. Result of research indicate that there are 23,6 % building residing in less condition or did not maintained. To be evaluated from building form, there are 11,1% less up to standard building hold up earthquake that is having regularity of vertical form and horizontal. Pursuant to characteristic usage of brick wall with building structure there are 40,8 % having structure system susceptance of earthquake that is using inappropriate practical log and column.
Perancangan Perangkat Lunak untuk Ekstraksi Ciri dan Klasifikasi Pola Batik Soesanti, Indah
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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The popularity of batik patterns in Indonesia has varied. Industrial modern devices in imaging have supported batik pattern recognition and classification. The important of product pattern information could not naturally visible. The information about batik pattern can be achieved by using the appropriate software design of image processing for extracting the features. One of the potential procedures is the unsupervised classification method based on specific feature.  In this research, the specific feature extraction based on the eigenimage of batik pattern was done. In the final step, the nearest distance eigenimage between reference batik image and test batik image was used to identify the batik from the classical pattern field point of view. The results of batik image identification conformed 96.67% with the reference batik images.

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