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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 8 Documents
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Search results for , issue " Vol 12, No 2 (2009): NOVEMBER 2009" : 8 Documents clear
Extensive Geotechnical Instrumentation Program to Control Dike Raising Constructed on Soft Clay Tabbal, Mahmoud; Mansour, Ziad
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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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 APCs 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. 
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.
Perilaku Lentur Panel Beton Semi-Precast pada Daerah Lapangan Tanpa Metode Perkuatan Elemen Pracetak: Tinjauan pada 1, 2 dan 3 Panel Khoiroh, Umi; Siswosukarto, Suprapto; Supriyadi, Bambang
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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A slab where only the lower portion of the floor slab is prefabricated and receives the top layer of floor slab which is cast in situ, in the context of this research is called semi-precast. For small projects, the transportation, storage, and installation of precast units can be a problem. There will be more problem if it is located in congested urban area. For this reason, precast slab panel system in smaller size and weight was introduced. The precast concrete element which is has a rough surface was predicted capable to act as composite, although no shear reinforcement method was used. The objective of this research is to study the characteristic behavior of semi-precast panel without shear reinforcement method on its interface. The characteristic investigated includes flexural capacity, stiffness, ductility, and failure mode of the slab. In this study, the specimens were divided into two groups. The first group is monolith slab that consists of one, two, and three panel(s). Each panel has 120 mm thickness, 3000 mm span length, and 200 mm width of concrete slab. The second group is semi-precast slab that consists of one, two, and three panel(s). Each panel has 70 mm thick precast slab that serves as formwork for 50 mm in situ concrete layer, to form a 120 mm thick of concrete slab. Dimension and shape between semi-precast and monolith slabs are identical. All specimens were tested under static load and failure load. Experimental results revealed that the stiffness of semi-precast slabs is lower than the monolith slab. More number of panels reduced stiffness differences between semi-precast and monolith slab. It also increases the value of stiffness and flexural capacity of the slabs. The failure mode and crack pattern is classified as flexure. Existence of interface plane which is using no shear reinforcement method can decrease the value of stiffness and flexural capacity of the slab. From the results, it is shown that the slip occurred on the semi-precast slab’s interface. It is predicted that the slip was due to the influence of no shear reinforcement on the interface.
Desain Kontrol Beban Elektronik pada Pembangkit Listrik Tenaga Mikrohidro Effendy, Machmud
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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Due to its lower cost and quicker response in compassion with governor, electronic load control (ELC) has been widely used to replace governor in microhydro power plant. It has lower price and quicker response than governor. The synchronous generator used in microhydro power plant produces stable voltage, because it has been controlled by an AVR (automatic voltage regulator. If consumer loads changes, the frequency not the voltage of the electrical wave will change. Therefore, ELC is used to stabilize the electrical wave frequency and detect the change of consumer load to be transferred to ballast load. This ELC uses frequency censor to detect the change of consumer load. Frequency censor proceeses linearity level to the change of voltage which equals to R2= 0.97. The use of ELC causes the generator voltage is approximately 220,3V to 224,4V with percentage of voltage unbalance 0,56% and the geneator frequency is 49,5Hz to 50,1Hz with percentage of frequency unbalance 0,41%.
Meningkatkan Efektivitas Arang Bakau Pada Proses Karburising Padat Baja Karbon Rendah Menggunakan Barium Karbonat Soemowidagdo, Arianto Leman; Mujiyono, Mujiyono
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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The effect of BaCO3 on bakau charcoal effectiveness as a carburizer for pack carburizing process was investigated. Bakau charcoal being produced from bakau trees were sifted on 30 mesh sieve. BaCO3 was then added into the bakau charcoal sieves with composition of 0, 15, 20, 25, and 30 wt %. The pack carburizing was carried out at 850 0C for 2 hours. Low-carbon steel containing 0.156 %C was used as specimen. After being carburized, all specimens were reheated at 850 0C, hold it for 5 minutes, and subsequently quenched into water at 28 oC. The result shows that BaCO3 improves bakau charcoal effectiveness as a solid media in pack carburizing proces. By adding of 20, 25 dan 30 wt % of BaCO3, it produced the case depth of 190 mm, 250 mm dan 325 mm, respectively. Martensite structure that arises on steel surface after being quenched indicates the increase of the amount of carbon atoms. 
Analisis Kelayakan Investasi Asphalt Mixing Plant (Studi Kasus: PT Perwita Karya di Base Camp Piyungan, Bantul) Priyo, Mandiyo; Gunawan, Aditya
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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The construction sector has contributed an important role in the development, especially in Yogyakarta Special Region. To implement this role, the construction sector is in front of the challenge to present the excellent quality of their construction works. This condition is able to initiate the opportunities for private industries to invest in this sector whether it is expansion or diversification. As similar with other investment projects, financial feasibility analysis in civil construction sector is becoming a main consideration in the investment plan. This paper presents the application of financial feasibility analysis on the development plan of the asphalt mixing plant. Financial analyses used in this study were Rate of Return on Investment (TPI), Return on Equity (TPMS), Break Event Point (BEP) and Net Present Value (NPV). A case study of Asphalt Mixing Plant investment plan owned by PT. Perwita Works which is located in Piyungan District, Bantul, Yogyakarta was considered in this study. From the results, it shows that TPMS value of AMP investment plan was found to be 3.575 which indicate that the investment is profitable. Break Event Point (BEP) in year of 1992 reached over 8 months with the total revenue and NPV value of IDR 6,190,445,178.00 and IDR 7,144,013,903.00, respectively. It means that the investment can be paid back and the company receives the profit of IDR 7,144,013,903.00.
Robust Canonical Correlation Analysis on Leakage Current Behaviors of Geothermal Polluted Porcelain Insulators Waluyo, Waluyo; Sinisuka, Ngapuli Irmea; Suwarno, Suwarno
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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This study presents the leakage current measurements results of three natural geothermal polluted porcelain insulators. The insulators consisted of one new-clean insulator, as reference, and three polluted insulators. The carried out measurements were leakage current and applied high voltage waveforms, used a two-channel storage digital oscilloscope, in a hermetically sealed chamber, where temperature, humidity, pressure and applied voltage amplitude could be adjusted and measured simultaneously. The leakage current waveforms were analyzed using the FFT and the statistical concerns were analyzed by the Fast-Minimum Covariance Determinant (FMCD) of robust multivariate statistical tools, and canonical correlation analysis (CCA). The result indicated that after the fundament, the second highest of harmonics leakage current were fifth harmonics. The leakage current waveforms were significantly influenced by humidity, besides pollution. The dependent or output variables are linear functions of independent or input variables. Based on CCA, the dependent parameters depended on input parameters tightly, with the canonical correlations were more than 0.99. The leakage current  amplitudes were still predominantly influenced by applied voltage amplitudes, where the phase angles and THD were slightly influenced by relative humidity. On these experimental measurements, the insulators were still in normal operation. 
Penentuan Modulus Geser Tanah Menggunakan Metode Analisis Multi-channel Gelombang Permukaan Ariestianty, Susy K; Taha, Mohd Raihan; Anuar, Khairul; Nayan, Mohd; Chik, Zamri
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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Multi-channel Analysis of Surface Wave (MASW) is one of non-destructive seismic methods that can be used to obtain the soil dynamic parameters, such as the shear wave velocity (VS) and the shear modulus (G). Indirect measurement of soil dynamic parameters can also be estimated by the empirical correlations of VS/G and NSPT values obtained from Standard Penetration Test (SPT). However, borehole test is required for SPT, which is relatively high cost and also may disturb in surrounding environment of investigated sites. Therefore, MASW seismic method then can be performed as alternative options in avoiding these problems. In this study MASW method was used to obtain the VS and G profile at several selected sites in Peninsular of Malaysia, i.e., Universiti Kebangsaan Malaysia Bangi campus, Selangor and Sungai Temala, Terengganu. The Rayleigh wave propagations are recorded using 24 geophones of 4.5 Hz resonant frequency connected to the seismograph. Subsequently, the seismic data is processed and analyzed to generate the VS profile versus depth in one-dimensional (1-D) and two-dimensional (2-D) form. In general, the shear wave velocity from MASW method measurements show reasonable agreements compared to the VS values obtained from empirical correlation of NSPT value. A good relationship between shear modulus from this study compared to empirical correlations of NSPT value from previous researchers. Finally, MASW method can be nondestructively used for identifying and validating subsurface soil condition of the investigated sites.

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