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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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Evaluasi Keandalan Fisik Bangunan Gedung (Studi Kasus di Wilayah Kabupaten Sleman) Ibnu Herlambang Sujatmiko, Mandiyo Priyo ,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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Since 2002 has made rules about Bangunan Gedung (UUBG) that is UU no. 28 and in 2005 also made rules of realization that is Rule of Government No. 36 where the contain is a building should managed administration and also technical. This research is to find outlevel of reliability of buildings from architect aspects there are structure, utility, and fire protection, ability of access, and also building sand  and environment in Sleman regency. Survey method (measuring, counting and filling in survey forms) was implemented to collect the primary data from the samples, and  the secondary data being used were IMBs (building construction licenses), PBB (land and building tax) slips, etc. The data were analysed using descriptive statistic and scoring depends on the book entitled Panduan Teknis Tata Cara Pemeriksaan Keandalan Bangunan Gedung, 1998, Dept. PU, and Peraturan Permen PU No.29/PRT/M/2007, Permen PU No.26/PRT/M/2008. The criteria being used to determine the building reliability were Reliable  for score of 95-100, Less Reliable for score of 75-<95, Not Reliable for score of <75.The result shows that the building reliability of the Stikes being 96.51, the PMI being 94.20, the BBLK being 93.10, the RSUD being 93.36, and the Rukan being 87.68. 
Pemanfaatan Batugamping Keprus Sebagai Campuran Agregat Pada Lapis Pondasi Agregat Kelas B Hardwiyono, Sentot; Widianti, Anita
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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Batugamping keprus banyak terdapat di Kabupaten Gunung Kidul, Yogyakarta. Penelitian ini bertujuan untuk mengkaji kemungkinan pemakaian batugamping keprus sebagai bahan campuran agregat pada  lapis pondasi agregat kelas B. Penelitian dilakukan dengan membuat berbagai variasi persentasi campuran batugamping keprus, sirtu dan tanah. Batugamping keprus bervariasi dari 15% hingga 85%, sirtu bervariasi dari 75% hingga 5% dan tanah tetap sebesar 10% dari berat total campuran. Pada setiap campuran dilakukan uji batas cair, indeks plastisitas, CBR unsoaked dan CBR soaked pada kepadatan maksimal dengan mengacu pada SNI. Hasil penelitian menunjukkan bahwa nilai batas cair, nilai indeks plastisitas dan nilai CBR unsoaked dari berbagai persentasi campuran batugamping keprus, sirtu dan tanah (kecuali untuk campuran 85% batugamping keprus, 5% sirtu dan 10% tanah) memenuhi spesifikasi yang telah ditetapkan oleh Bina Marga,  namun nilai CBR soaked tidak memenuhi spesifikasi tersebut.  
Pengaruh Faktor Lingkungan terhadap Strategi dan Kinerja Industri Manufaktur di Jawa Timur Hidayat, Rachmad; Budiarto, Hairil
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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This research examined the influence of environment factors (industrial, operational and remote) on the strategy and performance of manufacturing industries in East Java. The Structural Equation Modeling (SEM) was employed to test the hypotheses which emerged from the observed conditions. Moreover, the AMOS 4.0 was also used to perform the SEM. The results showed that the environment factors, i.e. industrial and operational environments as well as remote environments jointly affect the understanding of the environment industry matching with industry and environmental operational environment to establish its strategic objectives as an effort to achieve optimum performance manufacturing industries in East Java. Industrial environment conditions cannot be isolated from the global crisis because most industries prefer to concentric diversification strategy where new product technologies have a relevance to existing products.
Korelasi Empirik antara Kecepatan Gelombang Permukaan terhadap Kepadatan dan Kekakuan pada Campuran Laston – WC Rosyidi, Sri Atmaja P; Ariani, Indra; Djaha, Siti Isnaini K
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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Density and stiffness of asphaltic mixture are important parameter used for pavement design and construction. These parameter measure the required thickness of pavement.The aim of this study is to investigate the empirical relationship between pavement density and stiffness of Asphalt Concrete-Wearing Course (AC-WC) and surface wave velocity. Surface wave velocity is obtained from the seismic test set up in laboratory. A high frequency of impact source is employed in order to produce the high frequency waves propagating in mixture samples.The wave displacement is measured by accelerometer receivers connected to the computer for signal processing and spectrum analysis. In this study, AC-WC mixture is prepared with 35×,50×, 75× and 100× blows for providing sample with different density. From the results, it shows that the surface wave velocity is able to detect the various density of samples. Higher density of sample produces higher velocity and vice versa. Some empirical correlations between surface wave velocity with density and stiffness are also produced with significant statistical measures. This study shows the surface wave velocity is potential parameter employed for mixture assessment in pavement design and evaluation. 
Uses Of Lime -Rice Husk Ash And Plastic Fibers As Mixtures-Material In High-Plasticity Clayey Subgrade: A Preliminary Study Muhammad, Ario; Muntohar, Agus Setyo
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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Silica produced from rice husk ashes have investigated successfully as a pozzolanic material in soil stabilization. However, rice husk ash cannot be used solely since the materials lack in calcium element. As a result, rice husk ash shall be mixed with other cementitious materials such as lime and cement to have a solid chemical reaction in stabilization process. The main objective of this study focused on bearing capacity of the stabilized clayey subgrade with lime-rice husk ash and fibers. The main laboratory test shall be compaction and CBR tests. The investigation results revealed that the inclusion of lime-rice husk ash-fiber into the soil decreased MDD and OMC. On the other hand, stabilization and reinforcement with lime-rice husk ash and fibers waste improved significantly the CBR values 
Audit Keselamatan Jalan pada Jalan Yogyakarta-Purworejo KM 35-40, Kulon Progo, Yogyakarta Hardianto R. Mayuna, Wahyu Widodo ,
Jurnal Semesta Teknika Vol 15, No 1 (2012): MEI 2012
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Among 2008 until 2010, Polsek Temon Kulon Progo recorded that there are 197 traffic accidents in arterial road which connecting Yogyakarta and Purworejo. Because of the frequent occurence of accidents at that road, it is necessary to analyze the cause of traffic accident.  Road Safety Audit is needed to identify the highly-risky situation or the potency of accidents happened.This study used checklists and focused on the answer ‘no’ and also identified the other supporting infrastructures that do not meet the standard and technical requirements. Primary data were obtained from field observations by measuring spot speed and supervising traffic facilities along the way, while the secondary data in the form of traffic accident’s data from 2008 until 2010 were obtained from Polsek Temon. The result showed that from 2008 until 2010 at Yogyakarta-Purworejo road KM 35-40 as many as 197 events occurred with 75 person were seriously injured and another 142 people were lightly injured. The number of accident victims who died were male and the highest number of accident victims under the age of 35 years. Most accidents occured at KM 39, and in the morning (86 events). The cause of the accidents was mostly human (137 events). Pedestrians Accident is as many as 6 cases, and head-on is as many as 14 cases. It is also found that road-shoulders were still used as parking area or selling gasoline, as well as placing some flyers. The absence of special lanes for bicycles or other vehicles such as rickshaws, lack of sidewalks so that pedestrians use the road shoulder as a means of foot walking, shoulder width on the ringth and on the left of the road is not symmetrical, and also the -lack of drainage maintenance caused puddles occurs during the rainy season. Placing of power and telephone poles and lines is quite appropriate, but trees that was on the shoulder of the road still needs to be checked regularly so as not to interfere with the sight-distance of road users.
Optimasi Konfigurasi Mainjet Dan Slowjet Karburator Motor Bensin Satu Silinder 97 Cc Prawoto, Prawoto
Jurnal Semesta Teknika Vol 9, No 1 (2006): MEI 2006
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This paper describes a study that compared performance and emission from a 97 cc small single cylinder gasoline engine using five differences carburetor jet configuration. The study is based on the engine test bed results. The test results have shown that the bigger main jet produce slightly higher torque and power than the smaller one, but the fuel consumption also higher. The emission test results have shown a higher hydrocarbon (HC) and carbon monoxide (CO) for bigger main jet configuration. However Oxide of Nitrogen (NOx) emission from bigger main jet configuration was generally lower. The smallest jet configuration produced to lean fuel air mixture and caused engine over heat. The data obtained in this study indicate that the best configuration for the engine tested is 72/38 jet configuration.
Karakteristik Kecelakaan Lalu Lintas dan Pendidikan Keselamatan Berlalulintas Sejak Usia Dini: Studi Kasus di Kabupaten Purbalingga Sugiyanto, Gito; Santi, Mina Yumei
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
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Traffic accidents increased along with the increase in road traffic violations. One of the victims of traffic accidents is children. Road safety awareness and culture of children can be improved by doing the traffic safety education from an early age and promotion of the importance of road safety for children. Pedestrian is one of the vulnerable road users. The aim of this study is to investigate the characteristics of traffic accident in Purbalingga District, Central Java Province and the characteristics of the vehicle speed on arterial roads without median and introduces the principle of crossing the road by using 4-T procedure that is (Tunggu sejenak, Tengok kanan, Tengok kiri, dan Tengok kanan lagi) or waiting for a moment, look right, look left, and look right again to children from an early age. Based on the analysisof an accident data from 2010 till 2013, motorcycles are vehicles most involved accident followed by truck.Characteristics of speed in arterial roads without median with the function as a school district obtained a mean of the speed is 56.80 km/h. The probability of a pedestrian who was hit motorcycle or car passengers with this speed (56.80 km/h) will die is 90%.
Unjuk Kerja Resapan Air Hujan Barid, Burhan; Nugroho, Prasetyo Adi; Huda, Asri Lutfi
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Nowadays, the environmental problems that often occur are flood in wet season and drought in dry season. This happens because the rainwater runoff cannot seep into the ground well and the ground water level is decreased.  Excessive surface runoff can be reduced by a simple water infiltration wells on the land. To determine the efficiency of absorption well, a model was created using infiltration rainfall simulator unit to create the condition of heavy rain. This study aims to analyze the relationship between times and several parameters: soil moisture, the changes in the groundwater table, the runoff time, the volume of rainfall infiltration, and to determine the reliability of models with changes in water table. The study was conducted using the infiltration model unit which was made of steel plate with a size of 170x170x200 cm3. This model is divided into three spaces. The first space, which its size is 150x150x200 cm3, has two tests. The first one is labeled as A test and filled with medium silt with the elevation of -150 cm. The B test is filled with medium clay with the elevation of -125 cm. The second space, with the dimension of 170x20x200 cm3, is used to control the ground water level. The third space is used for measuring absorption capability and has dimension of 30x30x100 cm3. This model has nine holes on each side for measuring soil moisture and the 12th hole underneath is used for measuring changes in ground water level. After the artificial rain descended for 120 minutes, soil moisture and ground water level changes measured in every 10 minutes.
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.

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