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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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Efek Penggantian Bahan Bakar Bensin Dengan Minyak Tanah Pada Pompa Air Terhadap Volume Air & Konsumsi Bahan Bakar Yusron, Zaenal
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
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Mesin pompa yang menggunakan mesin bensin merupakan salah satu mesin konversi energi jenis pembakaran dalam motor dengan menggunakan bahan bakar bensin (C8H18). Maksud penulisan ini adalah untuk menyampaikan hasil atas suatu penelitian tentang efek penggantian bahan bakar bensin dengan  minyah tanah pada mesin pompa air. terhadap volume air dan konsumsi bahan bakar. Analisis dan interprestasi data dilakukan dengan cara Analisis Kuantitatif. Untuk menguji dua sampel kecil yang berpasangan maka digunakan Test Hipotesa pengujian dua sisi (Djarwanto Dan Pangestu Sudibyo; 1985: 191) dengan level of significance sebesar 0,01. Hasil penelitian menunjukkan bahwa volume air yang dihasilkan oleh pompa air yang menggunakan bahan bakar bensin dan minyak tanah terdapat perbedaan yang cukup signifikan, dengan taraf signifikansi 1 % karena harga t terhitung 3,883 tidak terletak diantara harga tabel t yakni -3,182 sampai 3,182. Bahan Bakar yang dihabiskan tidak terdapat perbedaan yang signifikan karena harga t terhitung 0,24057 terletak diantara t pada tabel yakni -3,182 sampai 3,182. Jika dilihat dari beaya yang digunakan untuk mengairi sawah satu petak (1250m3) untuk minyak tanak lebit irit Rp. 7.370,- sedangkan dari segi waktu maka bensin lebih irit yakni 3 jam.
Beton Mutu Tinggi dengan Bahan Tambah Superplastisizer dan Fly Ash Pujianto, As’at
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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Increasing concrete strength is one of the main necessities of concrete technology. For more than the last 20 years, high strength concretes with compressive strength ranging from 50 MPa up to 140 MPa have been used worldwide in high rise buildings and bridges with long spans, or buildings in aggressive environments. But in Indonesia high strength concretes possesses maximum compressive strength of 60 MPa. The properties of concrete are affected by cementitious matrix, aggregate, and the transition zone between these two phases. Reducing the water-cement ratio and the addition of pozzolanic admixtures like fly-ash are often used to modify the microstructure of the matrix and to optimise the transition zone. The reduction of the water-cement ratio results in a decrease in porosity and refinement of capillary pores in matrix, but flowing ability of the concrete will also decrease so that it can’t be workable. Then it workablity can be improve by the use of a superplastisizer. The method used refers to the planning of normal concrete, which is contained in the SKSNI 03-2834-1992. The results showed that superplastisizer with doses of more than 2% of the cement paste does not increase the strength of concrete. For all the rest of the experiments, the superplastisizer dosage was determined about 2 % of the powder mass. The first tests showed a good workability of the fresh concrete and a good self compacting ability with the fly-ash dosage of 12 % of the powder mass. The interest in reducing costs for increasing the concrete strength, can be successfully achieved in this research.
Analisis Ketepatan Penghitung Frekuensi dengan Metode Pencacahan Berbasis Mikrokontroler Kurniawan, Freddy; Basukesti, Agus
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
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A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency counters usually measure the number of oscillations or pulse per second in a repetitive electronic signal. A digital-signal frequency counter, can measure the number of positive-going-transition or the number of negative-going-transition of signal in a set of period time. This microcontroller-based frequency counter work by using a counter, which accumulates the number of negative-going-transitions occurring within two periods for 16-bit microcontroller-timer overflow. After the period, the value in the counter is divided by the period and transferred to a display. This frequency counter can measure frequency from 100 Hz to 1 MHz. The upper limit of frequency can be extended up to 256 MHz by adding a frequency divider. The analysis of the accuracy of measuring presented in this article can support to determine the number of digit to display.  
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)
Simulasi Cell Breathing CDMA 2000 1x Menggunakan DELPHI Perdana, Ilham; Hikmaturokhman, Alfin; Susilawati, Hesti
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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Cell breathing is variation of CDMA cell size depends upon the amount of traffic occurs within the cell. This work assume that the cell is in the ideal condition based on  the following assumptions,  each cell is completely isolated from the other cells, with the result that no intercell interference and signals from MS cause no interference within the cell. It makes no intracell interference occurs within the cell. In an ideal condition where is none of interference occurs, cell size and amount of users in a cell depend on several factors such as bitrate, required signal strength that MS must deliver to BS, voice activity factor, power control accuracy factor and Eb/It of the system. The result obtained by change the values of the parameters and based on the result obtained, the impact of the parameter to the cell size and amount of user in a cell could be recognized.
Perbaikan Balok Beton Bertulang dengan Metode Jacketing dengan Bahan Ferosemen Akibat Beban Siklik pada Beban Ultimit Muslikh, Bagus Soebandono , Andreas Triwiyono,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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A large number of buildings construction was made of reinforced concrete structure, composed of concrete and steel. The reinforced concrete structure elements could experience damage due to earthquake, from light to heavy failure, such as heavy bending-shear crack near the beam column joint. It is necessary, therefore, to repair the structure adopted good method and workability. The specimens were part of exterior beam-column joint model. Cyclic lateral load was applied to simulate earthquake load. This research used 3 specimens: US-1, the shear damage specimen as the result of first-step loaded test, then are repaired by using 1 layer rectangular galvanized welded wire mesh became R-US.1. US-2, the shear damage specimen as the result of first-step loaded test, then are repaired by using 2 layers rectangular galvanized welded wire mesh became R-US.2. UBB, the bending damage specimen as the result of first-step loaded test, then are repaired by using 2 layers rectangular galvanized welded wire mesh became R-UBB.   The result showed that the retrofitted on ultimate load by using jacketing ferrocement increased the ultimate strength capacity of 91,667%(US-1 to R-US.1), 81,818%(US-2 to R.US.2) and 28,571%(UBB to R-UBB) respectively. Increasing the hysteretic energy were 215, 66%(US-1 to R-US.1), 273,11%(US-2 to R.US-2) and 389, 84%(UBB to R-UBB). The ductility of retrofitted specimen 6,64(R-US.1) and 12,72(R-US.2). The initial stiffness of retrofitted specimens decreased 60%(US-1 to R-US.1), 40%(US-2 to R-US.2) and 18%(UBB to R-UBB).
Alat Perangkap Tikus Elektronis Arianto, Alfi; A, Fathul Qodir
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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Alat perangkap atau jebakan biasanya digunakan oleh seseorang yang ingin menangkap hewan buruannya. Alat perangkap yang umum digunakan disekitar rumah adalah alat perangkap tikus. Tikus merupakan salah satu hewan liar yang sering berkeliaran disekitar rumah. Selain sering memakan bahan makanan yang berada di rumah, kotoran-kotoran dari tikus ini juga dapat mendatangkan berbagai penyakit. Masalah akan muncul ketika menangkap tikus menggunakan sangkar perangkap yang sudah ada yaitu jumlah tikus yang mampu ditampung dalam satu sangkar perangkap hanya satu ekor tikus saja. Perancangan alat perangkap tikus elektronis ini terdiri dari dua bagian yaitu bagian rangkaian elektronika dan bagian mekanik, dengan persyaratan dapat mendeteksi tikus yang masuk ke dalam perangkap, mempunyai sangkar pengumpul, dapat menggiring tikus ke sangkar pengumpul, dan dapat memberi informasi adanya tikus yang tertangkap. Hasinya adalah alat dapat bekerja dengan spesifikasi mempunyai rangkaian sensor inframerah, rangkaian relai pengatur pintu perangkap, rangkaian timer 10 detik dan 15 detik, dan rangkaian power supply 12 volt dan 9 volt.
Pengaruh Lapisan Pasir di Bawah Fondasi terhadap Redaman dan Frekuensi Natural Akibat Beban Gempa Pujianto, As’at
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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Sand layer under foundation has been widely used for vibration damping by an earthquake since centuries ago. Due to being located in earthquake-zone and sand as natural material is widely distributed over regions, research on the use of sand for earthquake vibration damping is becoming important in Indonesia. The aim of this work is to study sand layer behavior in reducing earthquake vibration. Parameters of soil structure, i.e. damping ratio, displacement, soil pressure, and the change of natural frequencydue to the existence of sand layer under foundation were observed. In this study, soil structure was modeled as layered soil profile where top layer is a clay soil layer. Foundation base is located at a depth of 300 cm underlying varied thicknesses of course sand layer, i.e. 0, 50, 100, 150 and 200 cm under foundation. In order to produce various soil pressures, load magnitudes of 0, 10,000, 20,000, 30,000 and 40,000 tons were selected. Therefore, earthquake loadings with high and low frequency from Koyna and Bucharest earthquake record were implemented to soil structure models. Results showed that the increase of sand layer thickness does not essentially affect to the decrease of displacement. It is depending on the frequency of an earthquake. However, a thickness of 50 cm shows decrease of displacement due to high and low frequency earthwuake loading with the average deviation of 3.67 %. The displacement due to Bucharest earthquake loading is greater than that of Koyna earthquake, with the average ratio of 9.38 times. If ground frequency is higher than earthquake frequency, ground displacement is becoming smaller.
Pengembangan Energi Panas Bumi yang Berkelanjutan Gendut Suprayitno, Andiesta El Fandari, Arief Daryanto,
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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Electricity consumption in Indonesia increases rapidly in line with population growth. Electricity contribute to promote prosperity and public welfare as well as encouraging increased economic activity. Electricity has played an important role as one of the vital infrastructure that has support of political and economic as a priority. These situations make electricity demand continue to rise. On the other hand, electricity  production from fossil fuels have not being able to meet high electricity demand. In accordance with government policies to accelerate infrastructure electricity development without ignoring its sustainability then electricity supply is currently focused on renewable energy development. One of renewable energy is geothermal. As the world’s third largest geothermal electricity producer, it is very unfortunate if that great potential from geothermal development and its utilization still not optimal. This article discusses how the sustainable geothermal energy development  in Indonesia. Geothermal energy development as one of the renewable energy becomes very important to be discussed related to fossil fuel reserves are finite, price fluctuations in energy which influenced by world economic and political situation and rising levels of greenhouse gas emission from fuel combustion.
Pengaruh Sandwich Laminated Coco Mat Dan Chopped Strand Mat Terhadap Kekuatan Material Komposit Tarkono, Tarkono
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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The application of coco fibre is widely open. In rural area, as a main source of coco fibre, the fibre only used for cooking and family products. As the technology development, how coco fibre can applied as a part of composites materials. If it compound with other specific components, we can produce a new material with better mechanical properties. In this research, coco fibre with 0,2% wetness, compound with latex then pressed to get a coco mat with 2 mm thickness. Coco mat then formed with chopped strand mat to get a sandwich laminate composite. The original tensile strength of coco mat is 2,47 kgf/mm2 will increased to 12,93 kgf/mm2 if it formed as sandwich laminate coco fibre, its tensile strength improve about 80,90%.

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