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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 715 Documents
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Model Bangkitan Perjalanan Kerja dan Faktor Aksesibilitas pada Zona Perumahan di Yogyakarta Ersandi, Yuswendra; Munawar, Ahmad; Rosyidi, Sri Atmaja P
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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The aim of this paper is to develop the mathematical model of home based work-trip generation and to obtain its trip variables influencing the model. Factors of trip accessibility i.e. distance to work, travel time, cost for public transport and cost for private vehicle were also observed in the model. In this study, several households in Griya Taman Asri, Sleman Yogyakarta were chosen for questioner sample in home interview survey. Mathematical model was generated using the multi-linear regression with the dependent variable is work-trip which is affected by nine independent variables. The generated model was then validated by VIF and Anova test. The result shows that the work-trip generation model for Griya Taman Asri was influenced by parameter of the car ownership (X2) and the worker in household (X5). However, all trip accessibility factors considered in this study do not influence to work-trips.
Sifat Mekanis dan Struktur Mikro Pengelasan Gesek Baja Tahan Karat Austenitik AISI 304 Febri Irwanto, Aris Widyo Nugroho, Totok Suwanda,
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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The aim of this study is to investigate experimentally the microstructural properties and welding strengths of the friction welded joints using austenitic stainless steel (AISI 304) base metal. The experiments were carried out using a beforehand designed and constructed experimental friction welding set-up. Firstly, the welding experiments were under different friction pressure (1,38-4,14 MPa) and upsetting pressure (6,90-8,27 MPa). Later, the strengths of the joints were examined by tension test and the results were compared with those of the base metals. Microstructures in the interfaces of the joints were also obtained and examined. The results show that porosities were observed in bondline zone for all specimens. As the friction pressure increased, the fully plastically deformed zone becomes increased.  Tensile test results indicated that, generally the joint strength is increased with an increase of the friction pressure and the upsetting pressure. The friction welded joint strenght were found to be lower than that of the base metal. The detailed fractographic observation confirmed that the brittle rupture occurred at the joint zone. 
Karakteristik Pembakaran Biobriket Dari Campuran Batubara Dan Limbah Padat Pertanian Wahyudi, Wahyudi
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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Abstract

Penelitian karakteristik pembakaran biobriket dari campuran batubara dan limbah pertanian ( ampas tebu, serbuk kayu dan sekam padi ) telah dilakukan untuk mengetahui pengaruh komposisi campuran bahan bakar,  laju aliran udara, temperatur udara preheat dan tekanan pembriketan terhadap laju pembakarannya, Karena kandungan volatile matter yang relatif tinggi pada limbah pertanian , maka penurunan massa pada pembakaran biobriket yang mengandung lebih banyak limbah pertanian akan terjadi lebih cepat. Laju pembakaran maksimum yang terjadi, semakin tinggi pada biobriket yang mengandung lebih banyak limbah pertanian .Penurunan massa juga akan semakin cepat jika kecepatan aliran udara dinaikkan , demikian juga jika temperatur udara preheat semakin tinggi. Tekanan pembriketan juga berpengaruh pada penurunan massa walaupun tidak terlalu besar.  
Utilizing High Density Polyethylene (HDPE) Synthetic Aggregate as a Chip Sealing Material in Improving Skid Resistance Rahmawati, Anita
Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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There are four main factors causing traffic accident : human factor, vehicle factor, road factor and environment factor. Accident data from Poltabes Yogyakarata in 2007 showed that road factor causes accident is 2.45%. In effort to achieve traffic safety, the infrastructure must be considered in the first list. This research is dealing with “Utilizing High Density Polyethylene (HDPE) Synthetic Aggregate as a Chip Sealing Material in Improving Skid Resistance”. The purpose of this research is to understand the effect of chip sealing using HDPE synthetic aggregate on the skid resistance, so that the surface pavement can provide good service for traffic and road users and the quantity of accident can be reduced. In this research the skid resistance was  measured using British Pendulum Tester such that the its skid resistance is also called British Pendulum Number (BPN). BPN is a measured based on 3 variations of aggregate weight being spreaded, that are 240 grams, 271 grams and 304 grams. The result of BPN will be correlated with the wet accident ratio, friction coefficient and stopping distance. The BPN values being obtained are 55.96, 55.6 and 53.4, respectively. The BPN was found to increase with the increase of aggregate weight in chip seal mixture. It was revealed that BPN with chip sealing using HDPE could be increased by approximately 10 % in comparison with that without chip sealing. In addition, chip sealing using HDPE can reduce the accident ratio by 47.32 %, improve the traffic safety by 47.32 %, and shorten the stopping distance. The greater friction coefficient the lower stopping distance, and the lower stopping distance the better traffic safety. 
An Integration Of The Seismic Methods In Characterization Of An Unsaturated Granitic Residual Soil Site Rosyidi, Sri Atmaja P; Nayan, Khairul Anuar Mohd
Jurnal Semesta Teknika Vol 9, No 1 (2006): MEI 2006
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A comprehensive seismic survey encompassing the seismic refraction and the downhole method have been carried out in order to characterize a site of granitic residual soil.  The seismic refraction was found to be useful in the initial modeling of the subsurface and has managed to identify the water table, a bolder and the bedrock level satisfactorily.  From the downhole seismic, P-wave velocity was found to be responsived to lithology and the water table, while the S-wave velocity was found to be able to characterise the residual soil in terms of their weathering grades.  Correlations between the S-wave velocity (Vs) and dynamic shear modulus (Gseis)  were established with the SPT (N) and the static unload reload shear modulus (Gur)of the pressuremeter tests. The relationship of Vs = 2.89N + 167.84 and Gseis (MPa) = 2.39Gur + 36.03 were obtained in this study.  
Pengaruh Pemodelan Elemen Tangga pada Gedung Beton Bertulang terhadap Beban Gempa: Studi Kasus Gedung Hotel Tajem Paradise City Yogyakarta 5 Lantai Harsoyo, Yoga Aprianto
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
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Indonesia is a country that has a high seismic risk, so that the high-level buildings need to be designed to resist earthquake loads. Modeling of buildings generally use three-dimensional program. The designers usually model beams and columns as elements of the line and the rest, which were slab, shear wall and stairs modeled as two-dimensional elements or shell elements. Modelling stairs using shell elements can rigidify building. When structural elements in buildings are designed based on these conditions, it will be more vulnerable under seismic load. In this paper, it will be examined on effect of stair in buildings under earthquake load. The parameters that will be studied are building’s natural period, displacement between floors, and seismic forces that occur in the building. From this research, it is known that modeling without stairs will create a larger building’s natural period and displacement between floor so that modeling without stairs will make more conservative design structures against earthquake loads.
Asesmen Cepat Kerentanan Bangunan Sekolah Muhammadiyah Terhadap Gempabumi di Kecamatan Kasihan Bantul DIY Faizah, Restu; Syamsi, Muhammad Ibnu
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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School buildings are included as buildings with risk category IV (SNI 1726: 2012) because it is potentially causing multiple casualties if earthquakes occur during school hours. Therefore the readiness of school buildings to face the earthquakes should be prepared well. First of all, a rapid vulnerability assessment of the existing building under earthquake needs to be conducted. If the buildings are vulnerable then it should be followed by a strength check. This research objective is to assess the vulnerability of Muhammadiyah school buildings which are located in Kasihan sub-district of Bantul Regency, using Rapid Visual Screening FEMA 154-2002. There are 8 buildings, consist of elementary, middle school, and senior high school which are scattered in Tirtonirmolo, Tamantirto and Bangunjiwo, Kasihan, Bantul regency. According to FEMA 154-2002, the observation result finds that 4 schools indicated to have structure vulnerability under earthquake hazard so they need further analysis to know more detail about their strength. While the other 4 buildings do not need further analysis. The results of this study can be used as a recommendation for the Muhammadiyah Basic and Secondary Education Council (Majelis Pendidikan Dasar dan Menengah) to conduct more detailed testing for school buildings that are have vulnerabilites. In addition, this research method also can be extend to school buildings or non-school buildings in other areas. 
Mikrostruktur dan Kekerasan Sambungan Pengelasan Gesek Disimilar Pipa Tembaga/Kuningan (Cu/Cu-Zn) Nugroho, Aris Widyo; Suwanda, Totok; Serena, Septian Aldo
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
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This study is focused on the influence of friction time on the microstructure and the hardness values of butt  welded dissimilar pure copper/brass alloy pipes by continuous drive friction  welding. Five variation of friction times were applied during the welding processes. The joint were evaluated by microstructural analysis  and microhardness measurements. The results show that three distincs region were observed.  The grain formation in the three regions were revealed.  It was found that the hardness of the joints especially in HAZ regions were lower than that of the copper and brass base metals, while the hardness of the TMAZ region was higher than that of the copper base metal and the brass base metal. The microhardness values in the TMAZ  increased  with increasing the friction time up to 30 s and then decreased with incresing friction time.
Analisis Kekuatan Lentur Balok Aplikasi Tulangan Komposit Dengan Perlakuan Bedamutu Marsudi, Marsudi; Martono, Martono
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Concrete has a very high compressive strength, while tensile strength only 10 % from compressive strength. Concrete as building materials have varying prices depending on the quality of the concrete. The use of different concrete quality is expected to reduce production costs with the same strength. Steel concrete is the product can not be update, whose existence will someday be exhausted. To overcome these problems, As a replacement alternative is the use of bamboo reinforcement with wire bendrat that cost cheaper and high strength. In this research steel concrete is replaced the bamboo reinforcement with give bendrat wire is used of a simple concrete beam reinforcement. All beams concrete are given bamboo reinforcement with wire bendrat. The final results of research will known how big and ability beam modification with reinforcement of bamboo petung with the wire bendrat in receive bending style. Slump test, the test result is 7 to 10 cm. From the test results strength urge concrete cubes can be deduced that the average compressive strength of concrete K-150 is 157 kg / cm2 means that the average concrete has a quality K-157, higher than the planning the quality of (K-150) , then to the quality of concrete K-225, the average compressive strength of concrete have the quality of K-229, higher than the plan that is the quality of (K-225). Results of testing the tensile strength of concrete steel Ø 6 mm obtained an average value of 15 kN, whereas tes result for the reinforcement of bamboo petung profile that diprofil with bendrat obtained average value of 12 kN. Flexure testing result revealed that the quality of concrete beam strength of K-225 gained an average of 36.67 kN, while to the quality of K-150 in get strength 27 kN. The modification concrete beam different quality concrete with reinforcement bamboo petung reinforcement with is given bendrat wire is average test results research of 28.33 kN,while for testing concrete beam reinforced steel with different quality, the research result of flexure test give results 36.33 kN.
Perencanaan Strategis Sistem Informasi/ Teknologi Informasi pada Pusat Koperasi Industri Susu (PKIS) XYZ Susanto, Chayadi Oktomy Noto; Wurijanto, Tutut; Soebijono, Tony
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Corporate awareness of the importance of technology’s support in supporting efficiently and effectively business activities is increase. It is also being pursued by PKIS XYZ to manage their business activities. PKIS XYZ experiencing problems which only able to manage 33,33% of their raw materials, while the rest should be managed by another company which incidentally is their competitor. This is certainly not profitable for the company. This research will analyse business processes in PKIS XYZ which are not optimal implemented. The findings obtained will be used as a material planning what technology to be applied in an attempt to optimize the business activities of the company. The output of this research is recommendation of future application portfolio that important to be applied in PKIS XYZ. Framework used in this study was Ward and Peppard, with SWOT and  Mc Farlands Strategic as a tool.

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