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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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Perbandingan Kualitas Komponen Sepeda Motor Melalui Uji Standar Mekanik Djatmiko, Eddy; Karmiadji, Djoko W
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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Abstract

Sepeda motor adalah ragam transportasi favorit di Indonesia. Pembuat motor asing mengambil kesempatan ini dan telah beberapa tahun mendominasi industri sepeda motor Indonesia. Setelah krisis moneter yang besar, pembuat sepeda motor asing yang lain membanjiri pasar, promosi harga lebih rendah dan kesamaan kualitas terhadap pesaing mereka. Satu tujuan uji scientific diperlukan untuk membandingkan dua jenis sepeda motor agar supaya informasi kekonsumen yang benar mengenai kualitas suku cadangnya. Pengujian komponen sepeda motor ini (cylinder block, cylinder head, dan engine housing) yang dilakukan di laboratorium kekuatan material, komponen dan struktur PUSPIPTEK Indonesia (B2TKS  BPPT), akan menggunakan berbagai struktur teknik uji mekanik untuk kuantitas berbagai kualitas dari bahan komponen seperti nilai kekerasan, kuat tarik dan lenturan. Standar ASTM dan JIS pembuatan dan pengujian spesimen digunakan untuk membandingkan berbagai sifat mekanik komponen dari dua jenis sepeda motor. Spesimen langsung dibuat dari komponen melalui proses permesinan dan dibuat sesuai standar. Dari seri pengujian dapat disimpulkan bahwa kekerasan blok silinder sepeda motor asing  baru melebihi sepeda motor asing yang sudah ada.Kesimpulan hasil pengujian tarik yaitu “engine housing”. dan “cylinder head” serta cylinder block dari sepeda motor asing yang ada menghasilkan kuat tarik yang lebih tinggi jika dibandingkan dengan sepeda  motor produksi baru.
Perancangan Robot Pemadam Api Divisi Senior Berkaki Helman Muhammad, Latif Hidayat Iswanto
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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The main objective of this study is to use a good method to control the robot that capable of detecting the presence of light and avoiding obstacles in front of the robot without hitting the obstacles that may obstruct it. Legged robot uses sensors to detect the presence of photodioda the firelight and ultrasonic sensors (PINGTM) is to detect the presence or absence of obstacles so that legged robots are able to walk without bumping into obstacles that may obstruct it. A servo motor was used for driving the wheel of the feet. In this research, legged robots have been able to go scour the walls and extinguish the fire.
A New Formula For Rate Of Swelling Of Expansive Clay Soils Muntohar, Agus Setyo; Hashim, Roslan
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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The study of engineered expansive soils attracts the attention of researchers since this soil is mixed and increasingly used in many geotechnical and geoenvironmental application. This paper attempts to the study of swelling properties i.e. swell and swelling pressure, rate of swell, and water adsorption during swell. The kaolin-bentonite mix and sand-bentonite mix specimens are statically compacted and tested in conventional oedometer apparatus for swelling determination. The results of the study show that the mechanism of swell follows three distinct stages: intervoid, primary, and secondary swelling. The swell occurs since the soils adsorb water during water uptake. The rate of swell and maximum swelling are successfully determined using hyperbolic equation.
Analisis Kinerja Ruas Jalan HOS Cokroaminoto Akibat Perkembangan Lalu Lintas di Yogyakarta Gustav, Reza
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Yogyakarta is a region with high traffic. It also has high population density. These matters have been predicted to cause transportation problems. HOS Cokroaminoto Street, as a road in urban city center, has the potential to have such problems. Analysis and evaluation needs to be done to maintain good performance of the road. Manual Kapasitas Jalan Indonesia 1997 is used to measure the performance of traffic which includes operational analysis and the planning of urban roads. Level of Service Criteria (LSC) is determined based on the regulation of The Ministry of Transportation KM No. 14 of 2006. Traffic data had been obtained by counting the number of vehicles for 3 days on the busy-hour. These data were presented in tabular data of the vehicle, and then the performance of the traffic was analyzed. For urban roads, form UR-1, UR-2, and UR-3 (MKJI 1997) are used. Based on the results of the performance analysis on HOS Cokroaminoto Street with MKJI 1997 method, in 2010, the degree of saturation (DS) of the road is 0.43. It means that, in LSC term, this road is in level B. It is predicted that, in 2016-2020, this road will not satisfy the eligibility standard (DS> 0.75). This shows that the performance improvement of HOS Cokroaminoto Street is required. From the alternative solutions, the scenario of side friction reduction is more rational to maintain the eligibility and performance of HOS Cokroaminoto Street.
Aplikasi GIS dan Simulasi Banjir Sungai Siak Pekanbaru Menggunakan XP-SWMM Yusri, Yusri; Karim, Othman A.; Toriman, Mohd. Ekhwan; Kamarudin, Mohd. Khairul Amri
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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Pekanbaru, the capital of Riau province, consists of 12 localities and covering an area of 632.26 square kilometer. The current land utilization in this city may create sufcare hydrology problems, such as flooding and shortage of water. The objective of this work is to analyse the land utilization pattern in Pekanbaru in 2004 in conjunction with flooding problem. The ArcView GIS 3.2 software package was implemented to analyse the land utilization data provided by a satelite, and the XP-SWMM hydrodynamic software package was used to simulate the flooding of Siak river in Pekanbaru. The result showed that land utilization was dominated for farming (49.26%), followed by vegetation, forestry, and settlement (17.09%, 13.06% and 11.97%, respectively). The simulation revealed that the flood occured in 28 December 2004 had submerged three regions, i.e. Sri Meranti, Meranti Pandak, and Pesisir, covering an area of approximately 880 hectare. In addition to this, bigger floods had been predicted to occure in the near future if the utilization of land is not pecisely managed.
Pengaruh Pemasangan Bluff Body Terhadap Karakteristik Pembakaran Biobriket Gamayel, Adhes
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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Biofuels are organic feedstock fuel produced by living organisms, such as solids, liquids, or gases. Biobriket combustion process is affected by the heating value biobriket constituent materials and the amount of air entering the biobriket combustion chamber. The purpose of this study isto determine the effect of variations of the bluff bodygeometry on the biobriket burning process. The independent variable used in this study, arethe fan rotation and the bluff bodygeometry. Fan rotation being used are 1000 rpm, 1200 rpm, 1400 rpm, 1600 rpm, 1800 rpm and 2000 rpm, while the bluff body geometry are round, triangle, square, hexagon and octagon. Triangular cross-section bluff body was noted to produce the highest temperature of 33.21 °C at 100 second. While the lowest temperature wasreached at 500 second with 31.18 oC. Fan rotation at 2000 rpm was found to produce the most rapid combustion,burnt out 10 grams of biobriket within 500 seconds.The conclusion to this study is the higher the fan rotation speed, the faster the combustion process of the biobriket. Triangular bluff body was found the best shape in this study.
Peningkatan Citra Untuk Memperjelas Foto Brain Ct Scan Yulianto, Priyono
Jurnal Semesta Teknika Vol 11, No 1 (2008): MEI 2008
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The CT scan brain photo represent medical image result from Computer Tomographi (CT) Scanner process, normally obtained on photographic negative transparencies. The brain images were acquired from a CT scan photo presenting colour gradation in to gray level, that is : white colour, gray and black colour. In general have histogram which tend to reside in around dark in to gray level, so that its image less clear if seen with naked eye. and can be told exploiting of digital image enhancement not yet is optimal. The research was to show that digital image enhancement used to clarify photograph CT scan brain image. Data collecting done with procedure chosen normal diagnostic CT-scan brain photo and which have indication damage of brain effect of ischemic stroke. The CT scan brain photo so that can be processed must be done scanning beforehand for the image digitization is quantization. The image enhancement techniques can be processed is : histogram equalization transform, contrast stretching transform, histogram classify, region of interst to enhancement and edge detection. Histogram equalization (Histeq) transform, contrast stretching transform, histogram classify, region of interst to enhancement (ROI) and edge detection transform can be used for clarify CT scan brain photo, so that can assist radiology doctor in is diagnostic of disparity or damage brain effect of ischemic stroke. 
Optimalisasi Energi Terbarukan pada Pembangkit Tenaga Listrik dalam Menghadapi Desa Mandiri Energi di Margajaya T. Haryono, Arif Febriansyah Juwito , Sasongko Pramonohadi ,
Jurnal Semesta Teknika Vol 15, No 1 (2012): MEI 2012
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The Energy Self-Sufficient Village is one of main programs from goverment about the village ability to produce energy. This program has been launched in 2007 by the President of the Republic of Indonesia, to enhance energy security in rural areas by harnessing local energy potential. The criteria of Energy Self-Sufficient Village is village capability to produce at least 60% of the total amount of required energy, using renewable energy. Geographically, Margajaya village has solar and microhydro resource which is very potential for being developed. Furthermore, Margajaya also produces agricultural commodities such as palm oil, in which it also produces waste like palm bunches which is a very potential biomass. The optimization of renewable energy for electrical power generation which has annual power peak of 65kW and daily energy consumtion of 415kWh/day in Margajaya village has been designed using HOMER. The result from simulation of Hybrid renewable system in HOMER showed that Hydro, Biomass and grid is the most economical solution over hydro-biomass-PV with battery, to design hybrid system with minimum total net present cost (NPC) and cost of electricity. The system can serve annual 100% of load in Margajaya and have surplus of electricity, and could sell to grid with amount of 124.827kWh/years. Economically, the electricity of the system costs US$ 0,013/kWh.
Penelitian Nilai Kalor Biomassa : Perbandingan Antara Hasil Pengujian Dengan Hasil Perhitungan Wahyudi, Wahyudi
Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
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Indonesia memiliki berbagai jenis bahan bakar biomassa yang banyak seperti limbah pertanian, limbah peternakan dan lainnya. Walaupun banyak digunakan oleh masyarakat pedesaan sebagai bahan bakar, namun pemanfaatannya belum optimal, bahan bakar limbah pertanian masih berkisar pada kayu dan sekam padi, sedangkan ampas tebu, daun kering dan limbah peternakan belum banyak digunakan. Banyakya jenis biomassa yang belum dimanfaatkan secara optimal, khususnya di Indonesia, mengharuskan adanya penelitian-penelitian yang ditujukan untuk pemanfaatan biomassa sebagai bahan bakar. Pada penelitian ini akan dilakukan pengujian nilai kalor biomassa meliputi limbah pertanian dan limbah peternakan. Tujuan penelitian ini adalah untuk mengetahui nilai kalor biomassa yang diuji dan membandingkannya dengan hasil perhitungan menggunakan korelasi-korelasi yang ada. Penelitian diawali dengan melakukan analisa ultimat dan analisa proksimat masing-masing bahan untuk mengetahui komposisi dasar bahan. Data tersebut digunakan untuk memperkirakan nilai kalor bahan bakar berdasar korelasi-korelasi yang ada. Pengujian menggunakan kalorimeter bomb memberikan data kenaikan suhu yang digunakan untuk menghitung nilai kalor. Nilai kalor hasil pengujian dibandingkan dengan nilai kalor yang dihitung dari korelasi, sehingga dapat diketahui korelasi yang paling sesuai untuk biomassa yang diuji.   Hasil pengujian menunjukkan nilai kalor biomassa yang diuji adalah 10,2 MJ/kg sampai dengan 24,7 MJ/kg. Korelasi yang memberikan nilai kalor mendekati nilai kalor hasil pengujian adalah Korelasi Tillman. Korelasi yang paling sesuai untuk biomassa yang diuji adalah HHV = 1.3941.C-18.3638.H+1.4682.O+16.7184.N-95.753.S+0.5184.A
Analisis Cacat Las Incomplete Fusion Dan Retak Memanjang Pada Waterwall Tube Boiler PLTU Paiton Unit 1 Sahlan, Sahlan
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
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Weld defects in the form of "incomplete fusion" and lengthwise (longitudinal) crackswas observed at the boiler tube welding of steam power plants of Paiton Unit 1, row 3, located860 mm above theheader, .Incomplete fusionmay be caused by incorrect use of the the magnitude of current,welding speed, or manipulation or selection of the electrode being used, thatmay lead tounevenfusityand affect generate the cracks along the incomplete fusion region. Incomplete fusion defects in the waterwall tubes welding being visible from the edge of the boundary between the base material and weld region with the presence of indentation or depression in the form of a very deep crater welding. Indentations or hollows, that will be observed more clearly by using an optical microscope with a magnification 1000X, which in the presence of imperfections observed molecular fusion between grain boundaries and inter-molecular crystal. At 1000X magnification ofthe HAZ (heat affected zone) region,transition structure forming brittle fractures was observed 

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