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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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Analisis Kapasitas dan Efisiensi Pembersihan Mesin Pembersih Biji-Bijian Sistem Blower untuk Produksi Pakan Burung Olahan Rofarsyam, Rofarsyam
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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Abstract

The optimum cleaning capacity and efficiency of sheed processing in bird food production have been investigated by employing dimensional analysis. The types of grains, grain weight, blowing speed, hight and width of grain-fall were varied in order to obtaine the capacity, processing time and the cleaning degree data of the machine under investigation. The data were then analyzed to determine the product capacity-processing parameter, and efficiency-processing parameter relationships. It was con cluded that two mathematical model of product capacity-processing parameter relationship and efficiency-processing parameter relationship were governed from this study. These mathemetical models can be further used as a reference for determining the dimensions in manufacturing and operation blower system cleaning machine, in order to achieve its maximum cleaning capacity and efficiency.
Perbandingan Model Turbulen Spalart-Allmaras dan Reynolds Stress Model pada Analisis Efisiensi dan Rugi Tekanan Siklon Caroko, Novi; Suyitno, Suyitno
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
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Two different turbulence models, i.e. Spalart Allmaras (SA) and Reynolds stress model (RSM) are used as turbulence model in the cyclone investigation via numerical simulation. The appropriate turbulence model is key parameter on the analysis of cyclone performance. The cyclone has a characteristic diameter of 30 cm. Four different inlet gas velocities, i.e. 13.6 m/s, 14.7 m/s, 16.3 m/s, and 17.8 m/s are simulated in FLUENT. It is found that the particle separation efficiency is higher 90% for all inlet gas velocities variation when RSM is used as turbulence model. The pressure drop is increasing linearly with the inlet gas velocity. The utilization of RSM can give better result of efficiency and pressure drop than SA turbulence model.    
Metode Ekstraksi Ciri untuk Membedakan Citra Wajah Asli dan Foto Berbasis Perceptron Warsun Najib, Afri Yudamson , Indah Soesanti,
Jurnal Semesta Teknika Vol 16, No 1 (2013): MEI 2013
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Face is one of media for human identification. Previous studies aimed at identifying human face were for a two-dimensional images. Thus, fraud may occur when providing input in two-dimensional face images (photos). This study aims to distinguish the original three-dimensional face image with two-dimensional face image. Feature extraction based on facial geometry principles (Incomplete sentence, subject only, do not know what the authors mean). Face images (both the original and the photos) were captured at deviated angle, to the left and to the right. Each image is then sliced for each face components (eyes and nose) and sought the position of the center point of each component. Comparison between the value of the right eye-nose projection vector to the left-right eye vector and the value of the left-right eye vector become the characteristics of each image. The perceptron method was used for the classifiers. The result, the software can distinguish the original three-dimensional and two-dimensional face image with an error of 8.33% of the 24 tested images. Error occurred for some samples that show big round nose.
Karakteristik Pembakaran Briket Kokas Lokal Pada Beberapa Temperatur Karbonasi Setiabudi, Dedet Hermawan; Himawanto, Dwi Aries; Sukamta, Sukamta
Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
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In order to investigate the better carbonization process that used in foundry application, this research was performed the materials of this research are the local coke that usually used in Ceper Klaten. This local coke was pressed into cylindrical shape and then carbonize in the three variation  carbonized temperature i.e. 100 0C, 200 0C  and 300 0C as long as one hour then taken into furnace to find the combustion characteristics.The result shows that carbonization process has the optimal temperature.
Perilaku Lentur pada Keadaan Layan dan Batas Balok Beton Bertulang Berlubang Memanjang Bambang Supriyadi, M. Yusuf Amir , Djoko Sulistyo ,
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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I cross-section of reinforced concrete with reduced weight and concrete needs (in-complete sentence), but the reduction in strength is not considerably large. The implementation of I cross-section reinforced concrete beams is quite complicated and time consuming. This research was conducted to evaluate and compare the flexural behavior and the dynamic effects of a elongated hollow square beam that equivalent with a I cross-section beam. The specimens used in 4 (four) pieces of span 3500 mm, namely each one (1) beam control (BK) in the form of T beams with flange face down and 3 (three) beams with holes (BB1, BB2 and BB3) beam T looks like a hole in the geometry and materials together with 300 mm height, width and height of flange of 600 mm and 100 mm to 125 mm wide body BK BB 200 mm in width and height while the bottom flange BK 200 mm and 75 mm. Each specimen was statically loaded until failure, and dynamically loaded up to yielding occured using a vibrator machine. It was revealed that whilst both BK and BB capacity in terms of flexural strength is not significantly different, i.e. 2.03% for BB1, 2.49% for BB2 and BB3, and 3.96% for BK; for the flexural stiffness of the experimental results in a row BB1 -62.88% -63.58% BB2, and BB3 -22.70% to BK whereas the ductility consecutive BB1 4.699; BB2 2.094; BB3 2.225; 2.102 against BK. BK test beam that is equivalent to BB either does not guarantee the material and dimensions have the same natural frequencies for the system of joint-roller beam placement BB has a higher natural frequency with an increase of 14.061% compared to BK and placement system joints BB has a natural frequency higher with an increase of 10.145% compared to BK. For BK and BB crack pattern begins in the mid-span and the maximum load at failure crack pattern of flexural failure.
An Explicit Wavelet-Based Finite Difference Scheme For Solving Two-Dimensional Heat Equation M, Mahmmod Aziz; Susanto, Adhi; Soesianto, F
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
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Metode finite difference eksplisit adalah metode yang mudah diprogram dibandingkan metode finite difference implicit atau metode-metode numerik lainnya. Selain itu, metode eksplisit itu dapat digunakan untuk menyelesaikan persamaan panas “Heat Equation” linear dalam dua dimensi. Akan tetapi, metode eksplisit itu mempunyai sebuah kekurangan yaitu keterbatasan stabilitas dari penyelesaian numerik adalah sangat ketat. Oleh sebab itu, metode eksplisit itu tidak lagi termasuk daftar metode-metode numerik yang handal yang dapat digunakan untuk menyelesaikan persamaan-persamaan diferensial parsial. Oleh karena itu, maka diusulkan untuk menggunakan analisis wavelet Haar di dalam skema numerik dari metode eksiplisit untuk mengatasi kekurangan metode itu, yaitu keterbatasan stabilitas, dengan menjaga diskretisasi dari metode eksplisit agar tidak berubah. Kekurangan dari metode finite difference eksiplisit itu sudah dapat diatasi secara signifikan oleh analisis Haar wavelet yang tidak mempengaruhi logika metode asli yatiu metode eksiplisit. 
Peran Sumber Energi Terbarukan dalam Penyediaan Energi Listrik dan Penurunan Emisi CO2 di Provinsi Daerah Istimewa Yogyakarta Al Hasibi, Rahmat Adiprasetya
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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Electrical energy modelling involving renewable energy was produce using LEAP software. The model is based on electrical energy demand, renewable energy potential, and development planning in Yogyakarta Province. Renewable energy sources that have been simulated in this model are solar energy, wind energy, and micro hydro energy. The model describes the role of renewable energy in producing electrical energy to supply electrical energy demand in Yogyakarta Province. Furthermore, the role of renewable energy in CO2 emission reduction has also been simulated by the model. By optimal development, renewble energy gives 11,86 % share of electrictiy demand and reduce CO2 emission by 11,62%.
Analisis Arus Jenuh dan Panjang Antrian pada Simpang Bersinyal: Studi Kasus di Jalan Dr. Sutomo-Suryopranoto, Yogyakarta Rahayu, Gati; Rosyidi, Sri Atmaja P; Munawar, Ahmad
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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The aim of this paper is to analyse the delay length based on MKJI (1997). A case study was conducted on a signalized junction of Dr.Sutomo-Suryopranoto road, Yogyakarta. The correction was carried out on coefficient of basic saturation flow in ranging from 600 to 2200. Therefore, the predicted (from MKJI 1997) and measured delay length was compared. The results show that the coefficient on basic saturation flow calculation needs to be modified in the range of 600 to 2200 in order to find the similar length of the delay between prediction and field measurement. Passenger car unit (PCU) unit for motorcycle from MKJI (1997) was also corrected from 0.2 to 0.15. 
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.
Perubahan Kecepatan Aliran Sungai Akibat Perubahan Pelurusan Sungai Barid, Burhan; Yacob, Muhammad
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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Penanganan run off dengan secepat cepatnya cenderung hanya menyelesaikan masalah pada sub DAS tersebut dalam jangka  pendek dan akan memberikan resiko banjir pada daerah yang lebih hilir. Dalam jangka panjang dimungkinkan banjir juga akan bergeser pula pada sub DAS tersebut juga.   Penyelesaian banjir yang sekarang sering dilakukan adalah normalisasi sungai. Salahsatu unsur normalisasi sungai adalah pemberian tanggul sungai. Tujuan. penelitian ini adalah mengetahui perubahan kecepatan akibat pembuatan tanggul.Tanggul berguna untuk memperlancar aliran sungai dan mengganti fungsi bantaran sungai menjadi lahan pemukiman. Dinding tanggul umumnya terbuat dari bahan yang lebih halus daripada dinding alam sungai. Perubahan kekasaran sungai ini  menjadikan berubahnya kedalaman, radius hidraulik dan kecepatan aliran. Penghitungan kecepatan secara teoritis dilakukan dengan persamaan manning pada sungai sebelum dan sesudah ada tanggul. Besarnya perubahan diperoleh dengan membandingkan kedalaman, radius hidraulik, dan kecepatan sebelum dan sesudah ada tanggul.Hasil analisis yang telah dilakukan dari kondisi tanpa tanggul menjadi dengan tanggul untuk Q5 tahun : di P 394 tinggi muka air naik 5,861%, radius hidraulik naik 6,947% dan kecepatan air naik 19,523%. Pada P 249  tinggi muka air naik 4,327%, radius hidraulik naik 7,405% dan  kecepatan air naik 19,808%. Pada P 170 tinggi muka air naik 7,657%, radius hidraulik naik  9,708% dan kecepatan air naik 21,527%. 

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