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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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Pengaruh Pemasangan Energy Saver Pada Beban Rumah Tangga Ditinjau Dari Potensi Penhematan Energi Dan Kualitas Daya Sukisno, Toto
Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i2.847

Abstract

Energy conservation represents one of activity network to identify and evaluate the potency of energy saving an energy system. The effort of energy conservation of electrics in domestic sector which is a lot of conducted by a society is install the energy saver. This appliance is promoted can economize the usage of electrical energy in domestic sector. This paper study the influence of energy saver at domestic load was evaluated from potency of energy saving and power quality. Result of experiment indicate that 1) At resistive load of red hot lamp type, installation of energy saver result the addition consume the real power equal to 2,54% from real power of measurement  to ES 1 and 4,51% to ES 2; 2) At inductive load of type AC, installation of energy saver result the degradation consume the real power equal to 3,72% from real power of measurement to ES 1 and 1,05% to ES 2, while its THD current decrease to become 3,27% for the installation of ES 1 and 3,67% for the installation of ES 2; 3) At non linear load of Personal Computer type, installation of energy saver result the increase of real power consumption equal to 2,07% from real power of measurement and 1,49% to ES 2, while THD current increase to become 3,13% for the installation of ES 1 and its THD current decrease to become 7,84% for the installation of ES 2.
Perilaku Kuat Tekan dan Kuat Tarik Beton Campuran Limbah Plastik HDPE Danar Kurniawan, Bagus Soebandono , As’at Pujianto ,
Semesta Teknika Vol 16, No 1 (2013): MEI 2013
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v16i1.435

Abstract

Concrete is one of the most commonly used materials for construction. Due to the increased of concrete demand, the need for alternative material to substitute natural aggregate becomes crucial. In this study HDPE plastic waste was used as artificial aggregate. HDPE was mixed with natural coarse aggregate at variation of 0%, 10%, 15% and 20%. Compressive test and split tensile tests were performed on concrete age of 28 days. The compressive strength of concrete decreased with the addition of HDPE levels. The result shows that the highest value of compressive strength was 27,88 MPa on 0% HDPE and the lowest value was 11,08 MPa on 20% HDPE mixture. The highest split tensile strength achieved by normal concrete of 2,71 MPa. Split tensile strength of concrete gradually decreased with the addition of HDPE variations. The lowest value of tensile strength was obtained from variation of 20% HDPE plastic waste that is equal to 1.72 MPa. From the analysis it can be concluded that the replacement of coarse aggregate crushed stone with HDPE plastic waste reduce split tensile strength of concrete.
Generator Sinyal Electromyographic Dengan Menggunakan Metode Fast Fourier Transform Kholis, Nur
Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v9i2.870

Abstract

Generator Sinyal mempunyai peranan penting dalam identifikasi sinyal biomedik. Salah satu sinyal biomedik adalah sinyal Electromyographic (EMG). Sinyal Electromyographic merupakan sinyal yang dihasilkan oleh otot dan dapat dianalisis dengan mengamati bentuk, amplitudo dan frekuensinya. Dengan membandingkan frekuensinya kita dapat membedakan antara sinyal emg normal dengan sinyal pasien yang mempunyai kelainan. Sedangkan metode untuk mendapatkan respon frekuensinya dapat digunakan Fast fourier transform (FFT). Pada penelitian ini telah dibuat sinyal generator EMG yang menghasilkan 4 sinyal normal dan 4 sinyal yang mempunyai kelainan. Sinyal normal yang dihasilkan mempunyai range frekuensi 6 – 15 Hz dengan amplitudo –2.5 sampai 2.5 milivolt pada saat otot beristirahat. Daerah pengukuran terletak pada otot Biceps,  Tibialis Anterior, First Dorsal Interosseus, dan triceps.  Sinyal abnormal yang dihasilkan terdiri dari myophaty dengan daerah pengukuran di otot biceps, neurophaty di Tibialis Anterior,  neurophaty di Biceps, dan cedera syaraf sciatica di Tibialis Anterior. Untuk sinyal abnormal yang telah dihasilkan cenderung terjadi pengurangan amplitudo dan penambahan frekuensi.
Optimasi Kadar Aspal pada Stabilisasi Tanah Pasir Menggunakan Aspal dengan Uji CBR Ika Ernawati, Willis Diana , Afriza Marianti ,
Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v14i2.541

Abstract

This research aims to determine the optimum bitumen content for sandy soil stabilization (sandy soil obtained from Glagah beach, Kulon Progo). Variation in bitumen content being used was 0% to 5% by weight of dry soil. Against, a mixture of bitumen and sandy soil proctor compaction tests was performed to obtain optimum moisture content (OMC) mixture which then was tested its California Bearing Ratio (CBR). The addition of bitumen content in soil stabilization with bitumen causing a continuing lack of OMC (Optimum Moisture Content) and increased MDD (Maximum Dry Density) on the compaction process. The maximum CBR value, 20%,  was obtained at 2% bitumen content. . There was an increase of 150% CBR value when compared with the original soil without stabilization. CBR tends to decrease with further increase of the bitumen content  up to 5% which may due to the mixture being more plastic.
Analyzing The Bounce And Pitch Phenomenon Of Vehicle Model Through Xzbm Algorithm Karmiadji, Djoko W
Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v8i2.901

Abstract

In general, a vehicle model is one having multiple bodies, with each body being supported on a suspension represented by the tires, springs, and damping devices. The components of rigid body motion contain displacements, velocities, and accelerations at the body center of mass. These components consist of translation and rotation in and about the orthogonal axis directions. Since the springs and dampers have the steady loading due to the sprung body, the steady state of the model can be determined. The vertical bounce and pitch responds are influenced by the stiffness of dampers, springs and tires. The pure bounce is represented by the vertical response and the pitch motion is represented by the rotation at its rotation center. This paper demonstrates the bounce and pitch phenomenon through the benchmark model of vehicle, which is analyzed for determining the equilibrium state. The equations for bounce and pitch plane motions representing the X-Z multibody system are established by using the XZBM algorithm. The vehicle parameters are used for the numerical computations which the analysis established the bounce and pitch conditions
Evaluasi Tebal Lapis Tambah Perkerasan Lentur Menggunakan Metode Bina Marga (Pd T-05-2005-B) dan Asphalt Institute (MS-17) (Studi Kasus Jalan Yogyakarta- Bantul) Ilham Haris; Anita Rahmawati
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v16i2.4909

Abstract

The overlay is the addition of pavement layer thickness which is placed on the existing pavement construction to increase the strength and to serve the planned traffic during the specified period. This research is a case study conducted in Yogyakarta-Batas Kota Bantul road using Bina Marga and Asphalt Institute method. Although a new highway is upgraded, it is possible that the road construction will be damaged in a relatively short time. With this consideration, it is necessary to evaluate the thickness of pavement overlay. The length of the evaluated road segment was divided into three (3) sections, namely Segment I (Sta 4+000 - Sta 5+800), Segment II (Sta 6+000 - Sta 7+800) and Segment III (Sta 8+000 - Sta 10+320) to get the pavement thickness uniformity level. Based on the results of the analysis with the Bina Marga method (Pd T-05-2005-B), the thickness of the layers was added for segment I (6.942 cm), segment II (6.618 cm), and segment III (6.055 cm). While in the calculation using Asphalt Institute (MS-17) method, it was obtained that there was additional layer thickness 3.556 cm in segment I, 3.048 cm in segment II, and 2.790 cm segment III. The result of overlay thickness correction of Bina Marga method using AASHTO equivalent shows the number of 2.794 cm segment I, 2.470 cm in segment II, and 1.907 cm in segment III.
Pengaruh Perubahan Suhu pada Modulus Elastik Lapisan Beraspal Perkerasan Lentur dalam Pengujian Regangan yang Berbeda Hardwiyono, Sentot
Semesta Teknika Vol 14, No 1 (2011): MEI 2011
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v14i1.587

Abstract

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.
Studi Kelayakan Investasi Proyek Perumahan pada Proyek Pembangunan Perumahan Aura Tirta Graha Banjarnegara Priyo, Mandiyo
Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i2.1324

Abstract

The aim of this study is to evaluate the cash flow and the feasibility of the building investment project of Perumahan Aura Tirta Graha Banjarnegara. The data used in this study were collected from the contractor. The collected data were classified into two groups: primary and secondary data. The primary data cover the direct detailed examination of the research objectives. The data were collected by doing interview and observation. On the other hand, the secondary data were the historic data dealing with the plan and implementation of the project. In this study, there were several methods carried out in measuring the criterion of investment feasibility, i.e.: Break Event Point (BEP), Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Profitability Index (PI).  Evaluation results show that every method demonstrated various performance of the investment appropriateness. From the analysis, it can be concluded that the development plan of Perumahan Aura Tirta Graha Banjarnegara has been carefully analyzed and properly implemented.
Extensive Geotechnical Instrumentation Program to Control Dike Raising Constructed on Soft Clay Mahmoud Tabbal; Ziad Mansour
Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i2.733

Abstract

In its quest of increasing potash production, Arab Potash Company (APC) decided to increase the size of their salt evaporation pans. The Dike 18 which is spanning a length of 13km and enclosing a pan area of 16.5km2 was built between January 1996 and December 1997 as part of APC's expansion scheme. The foundation soils were predominantly varies from soft to very soft silty clay. From laboratory and field test results the undrained shear strength of the clay was between 28 to 40 kPa. An extensive instrumentation program was designed and implemented in order to control the dike raising during construction as well as to monitor the performance of the dike foundation during and after the construction. Instrumentations being installed included settlement spider magnets, level stations, standpipe and pneumatic piezometers. The major constraints of the instrumentation program were the large vertical settlements (2-3m) of the very soft clays, artesian conditions where sand and salt layers were present, high salinity of the groundwater and the development of sinkholes. Special installation and protection measures were developed to overcome these constraints. The performance aspects of the instruments were discussed and typical plots were presented. 
Analisis Waktu Perjalanan Terhadap Pembukaan Jalur Lingkar Selatan Surakarta Menggunakan Program TFTP Suwardi Suwardi
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i2.760

Abstract

Surakarta road network services high traffic volume to/from Surakarta city. It is caused by the activities are still centered. In addition, outside road network of city which is provided for traffic only passing Surakarta city is not available yet. Therefore, a Surakarta road network needs urgently to be expanded and a proposed ring-road is considered necessary. In order to anticipate the future traffic condition, effects of a proposed ring-road is studied. The aim of study is to predict the future traffic condition in terms of effective journey time after a proposed ring-road is implemented using Teacher Friendly Transportation Program (TFTP). The results show that effective journey time in 2009 and 2014 was significantly reduced after opening the proposed ring-road in the Surakarta road networks. The efficiency of journey time in 2009 was predicted in the range of 8 to 9 minutes for three alternatives and in 2014 was about 9 to 11 minutes. Meanwhile, the journey time for ring-road in 2009 was estimated in 17.1 minutes with the efficiency of journey time for alternative 1, 2 and 3 was calculated in 17.9, 10.9 and 13.9 minutes, respectively. The journey time for ring-road in 2014 was found to be 19 minutes with the efficiency of journey time for alternative 1, 2 and 3 is 20, 17.5 and 15, respectively.  

Page 48 of 72 | Total Record : 715

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