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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 24 Documents
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Search results for , issue "Vol 14, No 1 (2011): MEI 2011" : 24 Documents clear
The Analysis of CO2 Emission Reduction Scenarios in Industry Sector of Yogyakarta Province of Indonesia Al Hasibi, Rahmat Adiprasetya
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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The final energy demand and energy-related CO2 emission in industrial sector of Yogyakarta Province were analyzed in this study. The potential of energy saving and reduction of CO2 emission were estimated. The analysis was based on energy model. The model was constructed by LEAP model that describe the pattern of energy demand in industrial sector. Energy modeling and scenario analysis were used to simulate the impacts of various policies in energy demand and CO2 emission. Three scenarios were implemented in the model. Initially, the model was developed under business as usual (BAU) scenario that include current situation of energy-related activity in industrial sector. 2008 was selected as base year with projection period was terminated in 2025. Then, two alternative scenarios were developed that focus on energy efficiency improvement (EE scenario) and fuel switching to cleaner fuel (FS scenario). The two alternative scenarios were integrated into mitigation scenario. The result of alternative and mitigation scenario compare to BAU scenario in term of the final energy demand and energy-related CO2 emission. The result of the model showed the potential of energy saving by implementing mitigation scenario is 24.16% compare to BAU scenario. The expected reduction of CO2 emission under mitigation scenario is 20.22% compare to BAU scenario.
Pengaruh Perubahan Suhu pada Modulus Elastik Lapisan Beraspal Perkerasan Lentur dalam Pengujian Regangan yang Berbeda Hardwiyono, Sentot
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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Flexible pavement strength (Flexible Pavement) is affected by changes in the nature around the changes in temperature affect the strength asphalt layer and seasonal changes (precipitation) affect the strength of the soil layer is not particularly asphalt base. Research to determine the effect of temperature for a layer of flexible pavement in the field can be done in two ways. The first destructive test (Destructive Test, DT) such as core-drill are routed by means of a laboratory test using Universal Testing Machine (UTM). The second test is not destructive (Non Destructive Test, NDT) such as direct field test using a Falling Weight Deflectometer (FWD) and tools Spectral Analysis of Surface Wave (SASW). Testing the temperature of use as has been mentioned with a different strain performed at the Soekarno-Hatta road and highway Cikampek-Purwakarta, Bandung, West Java, Indonesia. Testing methods and testing different strain rates produce different elastic modulus values in testing asphalt flexible pavement layer. The general conclusion, the higher the temperature imposed on the asphalt pavement layer elastic modulus flexural yield whose value has declined. Conversely the lower the temperature imposed on the asphalt pavement layer elastic flexural modulus values produce increasingly rising. Different strain rate testing (FWD, UTM and SASW) on asphalt pavement layer is influenced also by changes in 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.
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.
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.
Sistem Pendeteksian Kerusakan Mesin Sepeda Motor 4-Langkah Berbasis Suara Menggunakan Support Vector Machine (SVM) et.al, Hesti Susilawati ,
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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Detection process early towards motorcycle engine condition will be important matter especially for common user motorcycle. This detection can be used to estimate motorcycle engine condition (normal or damage), damage kind, how big damage influence towards motorcycle continuance, motorcycle duration can survive with damage and cost estimate that taked suppose will repair damage. In this research is built 4-stroke motorcycle engine damage detection system based on voice uses Support Vector Machine (SVM) multi class. In system that proposed, motorcycle engine voice is recorded and then cultivated so that produce feature shaped coefficient Linear Predictive Coding (LPC). Coefficient LPC that extracted from this motorcycle engine voice then become an input for SVM. Furthermore SVM will determine motorcycle engine condition. Engine condition detection system based on SVM this meant to detect three engine conditions that is normal condition, damage cham chain and damage ignition system. System applications that proposed show that motorcycle engine condition detection system based on voice uses SVM has good accuracy that is 100%.
Pengaruh Grain Size Arang Aktif dari Bahan Limbah Industri Sagu Aren terhadap Penyerapan Polutan Limbah Batik Kuncoro Diharjo, Sudarja , Novi caroko ,
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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Sago palm industries leave large amount of wood waste that is about 30% of the volume of tree trunks, 20% in large size which can be used for the handcraft and about 10% in small-size which only wasted. On the other hand, batik industries produce hazardous and toxic waste (B3), that should be neutralized since this liquid waste are bad smell and  hard color, and even toxity  (contain various kinds of chemical elements and heavy metals such as Mercury (Hg), Lead (Pb), Chromium (Cr), Cadmium (Cd), and Copper (Cu)) and if the elements are absorbed by human body exceeds the threshold point, it would be dangerous. Therefore, experiment on activated carbon engineering and its use in adsorbing the B3 batik liquid waste is urgently required.  The main objective of the experiment is to know the adsorbsion effectivity of activated carbon in adsorbing the batik liquid waste. The main material used in producing activated carbon is waste palm tree trunks. The main material is heated to be charcoal in retort for about 5 hours, temperature around 500 º C. Furthermore, charcoal is crushed finely and screened in sizes of mesh 25, 35 and 50. Carbon powder then chemically activated using H2SO4 solution by heating in 500 ˚C for about 30 menutes. Finally this activated carbon used for adsorbing the hard colour and heavy metal (Pb, Cr, Cd) in the batik waste water. This research concluded that the sago aren industrial waste may be an alternative material for activated carbon which is effective in adsorbing the hard colour and hazardous heavy metal. Higher mesh size (grain size) of activated carbon give higher adsorbsion in colour and heavy metal. Activated carbon in mesh 25 adsorbed  68.59% Cd, 16.65% Cr, and 100% Pb, mesh 35 adsorb  76.25% Cd, 37.55% Cr and Pb at 100%, while mesh 50 adsorb 81.61% Cd, 58,33% Cr, and 100%  Pb.
Analisis Kelongsoran Lereng Akibat Pengaruh Tekanan Air Pori di Saluran Induk Kalibawang Kulonprogo Subiyanti, Hesti; Rifa’i, Ahmad; Jayadi, Rachmad
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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During rainy seasons, landslide occurs every year in Talang Bawong, Kalibawang Irrigation Channel thatcan damage houses, school building, bridge and the channel. Considering this fact, a numerical analysis by modeling the slope at the site was conducted. The objectives of this research were to identify the rain characteristic in the research site and to recognize its influence towards the change of water pressure in soil as well as the slope failure. The input data of this analysis were slope topography, physical and mechanical properties of soil applied. Groundwater flow in the slope model was numerically simulated by using SEEP/W software. Designed rainfall with appropriate return period was determined by analizing the maximum daily rainfall data with the aid of HAVARA software, while rainfall depth distribution was completed by applying frequency analysis. The historical daily rainfall data (1985 – 2004) were obtained from Kalibawang rain stasiun. Six rainfall models, as follow: initial condition (no rain) (model I), heavy rain in a short duration (model II), normal rain 25 mm and 40 mm in a long duration (model III), normal rain 20 mm in a long duration (model IV), heavy rain followed by normal rain 20 mm (model V), and normal rain 20 mm followed by heavy rain (model VI) Were analyzed. The output of the simulation was water pressure distribution data, which in turn being used as input data in analyzing slope stability using the SLOPE/W software. The result of the research showed that the highest rainfall with 2-year-return period was 114 mm while the dominant duration was 4 hours/day, and it was applied in the model II. The result showed that, a normal rain in a long duration is more severely influenced the change in water pressure than a heavy rain in a short duration. The safety factors are 1,444 for no rain condition, 1,418 for 114 mm rain for 4 hours, 1,208 for 25 mm and 40 mm rains, 0,982 for 20 mm rain, 1,397 for heavy rain followed by normal rain, and 1,402 for normal rain followed by heavy rain. In addition, a 20 mm normal rain on the 61st  day resulted in the most severe influence on the slope failure. 
Peranan Teknologi Solar Cell dalam Peningkatan Daya Saing Usaha Kecil dan Menengah Iswanto, Rif’an Tsaqif As Sadad ,
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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Rolling blackouts or blackouts caused by technical errors making people uncomfortable, one of those affected are Micro, Small and Medium Enterprises (MSMEs), due to power outages in various regions in Indonesia made a number of MSMEs to be losers. In addition to the problems faced by MSMEs is the occurrence of the peak load at night cause they can not work in the evenings (overtime). For that alternative energy is necessary for the SMEs in order to work, when electricity from PLN is susceptible to interference (fault) or in the repair process. With the considerations above, this study attempted to apply the technology Solarcell Home System (SHS) to be implemented as an energy reserve and secondary in the industrial sector, particularly in the MSMEs. The results showed that the use of technology can enhance business transformation solarcell through speed, and accuracy in producing goods. The SME entrepreneurs can increase production by using solarcell home system.
Perbandingan Analisis Lendutan Pelat dengan Menggunakan Metode Beam on Elastic Foundation (BoEF) dan Finite Element Method (FEM) Diana, Willis
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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The aim of this study was to compare deflection plates are supported by soil by using the method of Beam on Elastic Foundation (BoEF) and Finite Element Method (FEM). To validated the  methods, used data from laboratory testing of the loading plate models. For the calculation of deflection plates on elastic (soil) foundation, the accuracy of determining the modulus of subgrade reaction will greatly affect the calculation of deflection plate. Deflection calculation used Finite Element Method and BoEF method gave deflections, where close enough to those of experimental result. Both methods can be used to estimate the plate deflection.

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