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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 Cabut-Serat Nylon 600 Tertanam Dalam Matriks Sementitis Berbasis Fraktur Susilorini, Retno
Jurnal Semesta Teknika Vol 11, No 1 (2008): MEI 2008
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The fracture mechanics is known as a fracture based approach to prohibit a catastrophic failure of structure. In micro scale field, the fracture mechanics is implemented especially to determine the performance of interface between fiber and cementitious matrix in ‘fiber-reinforced cementitious composite’. The studies and applications of nylon clearly define the advance characteristic of nylon may influence the overall performance of composites and become a crucial issue to be learned, therefore, this paper forwards a fractured based pull-out model of short nylon 600 embedded in cementitious matrix with main concern on fracture phenomenon. The research applies experiment that applies pull-out test with embedded nylon 600 in cementitious matrixand the analytical method that constructs the fractured based pull-out model. The experiment results show the specimens with pull-out fibers have embedded length lf = 30-60 mm and the broken fibers lf = 70-100 mm. The pull-out test also shows several stages: (a) Pre-slip stage, (b) Slip stage, and (c) Strain-hardening stage. The model fits to experimental results. Several theories meet conclusions: (a) Whenever fracture takes place, it is always an unstable crack, (b) Stable cracks are established by the presence of crack arrester, (c) There is no way directly to determine the length of stable crack, but it still can be determined by fractured based approach, (d) The length of stable crack is determined by the position of crack arrester, (e) There is an equation derived for pull-out model (f) There is an equation to determine the stable crack length, (g) Stable cracks may be used to determined the bond capacity, (h) After the establishment of stable cracks, increasing strain beyond  strain e1 will not increase stress s1, hence do not induce additional fracture, (i) Increasing of strain e after the establishment of stable cracks will increase stress s, then the second slip will not take place, (j) Broken nylon fibers have a longer embedded length because of the possibility of crack arrester presence is bigger than the shorter ones.
Analisis Sistem Penyediaan Air Bersih di PDAM Tirta Silau Piasa, Kisaran Barat, Asahan, Sumatra Utara Ramadhan Saragih, Surya Budi Lesmana ,
Jurnal Semesta Teknika Vol 16, No 1 (2013): MEI 2013
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Water supply in Indonesia is facing some problems, such as lack of available water resources, lack of water supply services to the whole community and many water sources are polluted. In this study the water supply system in PDAM Tirta Silau Piasa was analyzed, and the results are used as input data for the evaluation of pipeline simulation using Waternet Software. Results of this study showed that the pipe for water distribution will still function properly until 2015 .
Arus Ground-Fault Di Dalam Rangkaian Generator Dengan Perbedaan Unsur-Unsur Yang Meng-Ground-Kan Netral Gozali, Moch
Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
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Hasil analisa arus zero-sequence yang mengalir di dalam generator netral dan pada penempatan Ground-fault sepanjang generator operasi normal dan selama Ground-faults di dalam gulungan-stator yang di tentukan. Pengaruh dari  perbedaan metode dari meng-ground-kan generator  netral pada arus ini di dalam sirkuit primer untuk parameter generator yang  berbeda, trafo dan kapasitansi tambahan untuk meng-ground-kan pemutus generator. Pengaruh ini dianalisa untuk generator dengan netral tidak di-ground-kan, untuk generator dengan resistansi di dalam netral dan untuk generator dengan menetralisirkan Ground-fault meng-ground-kan generator netral. Analisa telah dilakukan untuk resistansi riil menyangkut kerusakan saluran selama Ground-faults sepanjang keseluruhan panjangnya gulungan-stator generator. Hal itu telah ditemukan  metode yang diterapkan untuk meng-ground-kan generator netral, parameter trafo dan generator, kapasitansi tambahan untuk meng-ground-kan pemutus generator, tingkat kesalahan resistansi dan penempatan Ground-fault mempunyai suatu pengaruh substansiil pada aliran arus di dalam generator yang netral dan pada penempatan Ground-fault di dalam kerusakan saluran secara keseluruhan isolasi gulungan-stator generator.
Implementasi Telepon Seluler sebagai Kendali Lampu Jarak Jauh Filiardian Setiady, Iswanto , Agus Jamal ,
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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The bustle and activity of our daily erratic make us do not know when it comes to the house, where the lights are supposed to be lit. But it was not turned on because no one was home. This certainly makes us into a panic and anxiety, because it will not start from where we are. Another example is in the office, on the road, and anywhere at the time the house empty or unoccupied. From some of the problems mentioned above, the study sought to realize one of the benefits of the existing mobile phone. Utilization of it is to create a tool that can activate the light there at home by using a mobile phone channels. The system is able to turn on or turn off the lights even though the house empty or unoccupied by long distance. With this system we are and at anytime can menggendalikan home appliances remotely.
Kajian Eksperimen Kuat Tekan Beton Ringan Menggunakan Agregat Bambu dan Bahan Tambah Beton Endarto, Muhammad Riang; Zulfiar, Muhammad Heri
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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The use bamboo as a substitute aggregate is an effort to reduce the density and static load of structural elements. This reseach focuses on the problem related to the specific gravity and compressive strength of the use of bamboo as a lightweight concrete aggregate. Specimens were produced using additive and 10 mm maximum grain size of bamboo agregate as a substitute for split aggregate, in a lightweight concrete composite systems. Variation of bamboo content as a substitute aggregate were selected being 0% (normal), 20%, 40%, 60%, 80% and 100% by weight of split aggregate. The samples are in the form of cylinder (of 15 cm diameter and 30 cm height), while the compression testing were performed after 14 days of treatment. The results showed that the lightweight concrete containing 80% of bamboo aggregate possessing compressive strength 5,86 MPa, which is below the minimum standard of ACI of 17,2 MPa.
Optimalisasi Kerja Tabung Induksi Menggunakan Mekanisme Katup pada Mesin Dua Langkah Jenis Yamaha Force 1 ZR Masy’ari, Masy’ari
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
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Rapid development of the automotive world, especially in the two-wheel motor vehicles, must also be compensated with fuel efficiency. Many ways has been used to save fuel for vehicles, particularly for two strokes (2t) gasoline motor, that uses YEIS (Yamaha Energy Induction System) technology, or known as tube Induction. This technology in general is used in Yamaha motorcycle engine with cylinder volume ranging from 155 cc, 135 cc, 150 cc to 250 cc. However the application of YEIS tube is not optimal. The goal of this research is to optimize the performance of the system by creating a system with valve mechanism to regulate incoming and outgoing flow of the mixture of fuel-air into the YEIS system. Induction tube acts as a buffer for fuel-air mixture preventing the mixture from returning to the carburetor during process strokes and then dispose of the rinse proceed with steps, so that the remaining fuel is not futile. The research was started with constructing induction tube, valves and valve housing, assembling and testing. The results of this research indicates that two-wheeled vehicles using an induction tube efficiency has better fuel efficiency than two-wheeled vehicle without induction tube and two-wheeled vehicle equipped with induction tube without the valve mechanism. The result also indicates that the acceleration of the vehicle is not reduced.
Pengeringan Tembakau dengan Sistem Hybrid Muhammad Nadjib, Dwi Aries Himawanto ,
Jurnal Semesta Teknika Vol 16, No 1 (2013): MEI 2013
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Productivity of tobacco crop may be affected by several factors, one of which is the weather that can influence the tobacco drying process. Providing a customized tobacco dryer may help solving these problems. The study begins by designing a solar energy and biomass (tobacco stem waste) combustion followed by manufacturing and data collection of dryer performance. It can be concluded that the dryer for 140 minutes can reduce the moisture content of fresh tobacco leaves to  64%.
Pengolahan Limbah Industri Sawit Sebagai Bahan Bakar Alternatif Sudarja, Sudarja; Diharjo, Kuncoro; Sutapa, J Pramana Gentur
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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pengolahan buah sawit di industri sawit menyisakan limbah serat buah sawit yang menumpuk di lingkungan perusahaan, dan mayoritas hanya digunakan sebagai urug atau dibakar. sebaliknya, masyarakat membutuhkan bahan bakar alternatif pengganti bbm, mengingat ketersediaan bbm yang makin menipis dan harganya relatif mahal. oleh karena itu kajian tentang pengolahan limbah biofiber (serat sawit) sebagai bahan bakar alternatif dipandang penting dan mendesak untuk dilakukan.Bahan utama penelitian adalah limbah sawit, dan perekat pati. serat dan cangkang sawit yang memiliki kandungan c tinggi diarangkan, yaitu dibakar pada tabung tertutup (menggunakan retort). selanjutnya dibentuk briket arang dilakukan dengan mencampur serbuk arang dengan perekat pati kemudian ditekan pada cetakan dengan mesin pres. pengujian yang dilakukan terhadap briket arang ini meliputi uji: kadar air (berdasarkan astm d-3173), nilai kalor (astm d-5865), kadar abu (astm d-3174), kadar zat menguap (astm d-3175 )dan kadar karbon terikat (astm d-3172). Hasil penelitian menunjukkan bahwa briket arang yang terbuat dari campuran cangkang dan serat sawit memiliki nilai kalor rata-rata 7.121,57 k kal/kg, kadar air rata-rata 8,9 %, kadar zat menguap rata-rata 18,43% dan kadar abu rata-rata 4,46%. untuk menentukan kelayakan penggunaan briket arang dari limbah sawit ini, perlu dilakukan dua penelitian lanjutan, yaitu tentang persentase abu terbang dan uji ekonomis.  
Analisis Lentur Balok Penampang T Berlubang Memanjang Menggunakan Metode Elemen Hingga Non-linier Sukarno, Praganif; ".", Muslikh; Sulistyo, Djoko
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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Numerical analysis is a time-, cost- and equipment-effective method to study the behavior of structures. ATENA is one of the available software-based on finite element method. Hollow cross section is one way to reduce the weight of concrete beam. The effect of holes on beam may reduce the bending resistance. The hollow beam was numerically modeled which and subsequently analyzed using the ATENA v.2.10 software. Material parameters being used as input data was obtained from laboratory tests, assuming that steel-concrete bond was prefect, and and the steel reinforcement was modeled as discrete. The results of numerical analysis of the ATENA were then compared with experimental test results on the flexural behavior and serviceability limit state of reinforced concrete hollow beams lengthwise (Amir, 2010), then study the variation of quality parameters of concrete and the hole size variations. The results shows that the collapse load of hollow beam reached only 96.71% and deflection reached 135.96%. Stiffness of hollow concrete beam was also showed a higher stiffness of the experiment. The crack pattern is flexural fracture and very much agree with that of the experiments. Test parameters of concrete quality variations as well as the hole size variation showed higher concrete quality/size of the hole will reduce the ductility of beam.
Analisa Korosi Atap Aluminium Tipe Kulit Jeruk Tebal 0,8 mm Riyanta, Bambang; Rahmatullah, Ade
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
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ABSTRACTPenelitian ini dilakukan untuk mengetahui  kasus rusaknya atap plat aluminium gelombang tipe kulit jeruk dengan ketebalan 0,80 mm yang dipesan PT. Amann Jaya di Teluk Betung Selatan Lampung dari PT. Alka Jaya di Jakarta, Plat aluminium tersebut mengalami  kerusakan yaitu timbulnya bercak abu-abu kehitaman yang diduga rusak dikarenakan tutup plastik robek  sehingga basah oleh  air hujan pada waktu pengiriman melalui cargo darat. Oleh karena itu diadakan beberapa pengujian untuk mengetahui timbulnya kerusakan yang terjadi pada pelat aluminium tersebut, pengujian yang dilakukan diantaranya adalah uji komposisi kimia, uji struktur mikro,uji visual, uji fraktografi, dan uji kelembaban. Setelah diadakan beberapa penelitian diatas dapat diketahui bahwa Jenis korosi yang terjadi adalah  korosi sumuran . Plat aluminium tidak rusak karena air hujan pada waktu pengiriman melalui cargo darat melainkan akibat bahan baku terendam banjir sebelum plat mengalami proses pengerolan .

Page 8 of 72 | Total Record : 715

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