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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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Sistem Pengendali Suhu, Kelembaban Dan Cahaya Dalam Rumah Kaca Hariadi, Tony K
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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Abstract

Rumah kaca merupakan sebuah bangunan tempat budidaya tanaman dengan pengaturan beberapa variabel di dalamnya agar sesuai dengan kebutuhan tumbuh kembang tanaman yang sedang dibudidayakan saat itu. Perkembangan teknologi elektronika memungkinkan untuk melakukan pengendalian variabel-variabel tersebut secara otomatis dan terus menerus. Penelitian dan perancangan ini bertujuan untuk membuat sebuah sistem pengendali temperatur, kelembaban, cahaya, dan penyiraman dalam rumah kaca secara terpadu. Implementasi pengendalian rumah kaca dilakukan dengan menggunakan mikrontroler sehingga memudahkan pemrograman terhadap kondisi-kondisi tanaman yang berbeda-beda dengan berbagai perlakuan yang berbeda pula. Suhu diatur menggunakan air conditioner yang sudah dimodifikasi untuk diprogram dari mikrokontroller,s sedangkan pengaturan cahaya menggunakan lampu dan pengaturan lain adalah kelembaban berdasarkan perhitungan suhu basah dan kering serta penyiraman. Setelah pembuatan alat selesai, maka alat tersebut diujicobakan didalam rumah kaca dan diamati kondisi di dalam rumah kaca selama 3 kali 24 jam.  Hasil ujicoba menunjukkan bahwa alat tersebut mampu mengendalikan parameter-parameter yang diinginkan sesuai dengan program pada mikrokontroler, dan mampu mengurangi efek kondisi cuaca di luar rumah kaca.
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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Abstract

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. 
Penyesuaian Impedansi Antena Open Dipole RF 217 MHz Menggunakan Metode Single Stub Prasaja, Bledug Kusuma; Sirat, M Abdulah K
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
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Abstract

Penyesuaian impedansi merupakan suatu masalah yang sangat penting untuk diperhatikan pada saat menginstalasi antena suatu pemancar. Gelombang yang dipantulkan kembali ke pemancar akan mengakibatkan panas dan kerusakan pada penguat akhir pemancar, sehingga menyebabkan penurunan daya atau daya yang dihasilkan oleh pesawat pemancar tidak akan maksimal. Penelitian dilakukan untuk mengetahui seberapa besar impedansi antena berkontribusi pada matching impedance (penyesuaian impedansi), menggunakan metode single stub tuner. Hasilnya adalah Pada pengukuran yang menggunakan kabel koaksial RG-55 A/U, posisi paling match terjadi pada jarak 30 cm dari antena ke arah generator sehingga stub dipasang secara permanen pada jarak tersebut, sedangkan  pada pengukuran yang menggunakan kabel koaksial 5D-2W, posisi paling match terjadi di antena itu sendiri dan tidak ditemukan posisi match pada saluran sehingga stub tidak dipasang. Pada kabel koaksial RG-11/U, posisi paling match terjadi pada jarak 20 cm dari antena ke arah generator sehingga stub dipasang secara permanen pada jarak tersebut. 
Implementasi Sensor Pyroelectric Infra Red (PIR) Sebagai Pewaktu Televisi As Sadad, Rif’an Tsaqif; Iswanto, Iswanto
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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Abstract

Energy dissipation is very disturbing for a countrys survival, including Indonesia. Power dissipation generally occurs because of the lifestyle of people who tend consumptive Indonesia. One example of energy waste in the household is often forgot to turn off the television. The timer on the television was made in order to be able to set how long the TV will die (off) by itself in accordance with a prearranged time. However, not everyone can or know of this timer function, especially those who have elderly. Many cases of elderly people see television to fall asleep without turning it off. In this case certainly happens waste of electricity. In this study will be designing and manufacturing tools that can be used as a detector of movement of people in front of the television, so television is only lights up if there is a movement of people who watch television. From the results of this research tool is able to detect the movement of people in front of the television, with the effective distance of the tool is 2 meters.
Analisis Kinerja Kontraktor yang Menerapkan Sistem Manajemen Mutu ISO-9000 Priyo, Mandiyo
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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The growth in the implementation of quality management system standard as an instrument to win global market competition and to improve product and service quality has affected not only manufacturing industries but also construction industries. One of the standards that is most widely implemented by companies or organizations in quality management system may be the ISO 9000. It should be noted that the ISO 9000 is not a standard for products or services, but it is a standard for quality management system employed in their production process. The objective of this research is to study the implementation of the ISO 9000 standard by the PT. Wijaya Karya Beton that has adopted the ISO 9000 for its quality management system standard. In addition, the criteria for evaluating its performance have also been identified. This criterion includes written procedure and its consistent implementation, as well as the measurement of the implementation result of its operation process flow and working procedures. This research was carried out by means of performance measurement, i.e. qualitatively by employing questionnaire, scoring and measurement on productivity and targeted quality achievement such as rework rate and reject rate. The data were collected by observation, extraction from the internal and external quality audit report, as well as daily-, weekly- and monthly reports on the pile production. The effect of company’s performance that employs the ISO 9000 standard (qualitative measurement) on the productivity, rework rate and reject rate (quantitative measurement) were analysed using Pearson’s Product Moment correlation analysis technique. The result reveals that the qualitative measurement resulted in continuous performance improvement, so did the quantitative measurement. It showed that these two measurement methods tends to be in a good agreement. A general conclusion that can be drawn is that the ISO 9000 has been properly implemented in the PT. Wijaya Karya Beton.
Estimasi Lokasi Gangguan Hubung Singkat pada Saluran Transmisi Tenaga Listrik Syahputra, Romadoni
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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In this paper, a method for short circuit fault location estimation which uses data from both ends of overhead transmission line and which does not require the data to be synchronized is described. The method fully utilizes the advantages of digital technology and numerical relaying which are available today and can easily be applied for off-line analysis. The described scheme does not require real-time communications, only off-line post-fault analysis. The method allows for accurate estimation of fault location irrespective of fault types, fault resistance, load currents, and source impedances. The simulation for single line to ground fault and symmetrical three phase fault with the variation of fault resistance of 0 ohm, 10 ohms, 30 ohms, 50 ohms, 70 ohms, and 100 ohms, respectively. The simulation has been done by using Matlab software. The simulation results of estimation error are 0.296% for single line to ground fault and 0.112% for symmetrical three phase fault, respectively. The results have shown that the method can accurately estimate the location of short circuit fault on power transmission lines. 
Pengaruh Pemasangan Energy Saver Pada Beban Rumah Tangga Ditinjau Dari Potensi Penhematan Energi Dan Kualitas Daya Sukisno, Toto
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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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.
Optimasi Kadar Aspal pada Stabilisasi Tanah Pasir Menggunakan Aspal dengan Uji CBR Ika Ernawati, Willis Diana , Afriza Marianti ,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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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
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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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
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.

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