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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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Durabilitas Laston Dengan Filler Abu Gambut Yuniarto, Enno; Sentosa, Leo
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.v9i2.867

Abstract

Campuran beraspal merupakan campuran yang digunakan untuk membentuk lapis perkerasan lentur jalan raya. Campuran beraspal umumnya terdiri dari agregat, filler dan aspal sebagai bahan pengikat.  Material yang umum digunakan sebagai filler adalah semen, pasir, kapur dan abu batu, yang persediaannya terbatas serta relatif mahal. Alternatif lain yaitu penggunaan abu gambut yang merupakan limbah industri dari bahan bakar pabrik kertas. Salah satu jenis campuran beraspal adalah Lapis Aspal Beton (Laston). Campuran Laston yang baik adalah yang memiliki stabilitas, fleksibilitas, skid resistance ,kedap air dan durabilitas yang cukup. Untuk mengetahui keandalan dari Laston dengan abu gambut dari segi durabilitasnya, maka dilakukan pengujian durabilitas dengan tes perendaman modifikasi Marshall. Indek keawetan dinyatakan dalam nilai IRS dan Indeks Keawetan Craus dkk. Dari pengujian laboratorium pada campuran Laston dengan filler abu gambut memberikan nilai IRS sebesar 88.31% pada perendaman selam 28 hari dan nilai Indeks Keawetan Pertama Craus dkk ( r) sebesar  6.44%  serta Indeks Keawetan Kedua Craus dkk (a) sebesar 20 %. Jika dibandingkan syarat nilai IRS minimal dari Bina Marga untuk Laston, yaitu 75%, nilai IRS Laston dengan filler abu gambut memenuhi syarat.
Utilizing High Density Polyethylene (HDPE) Synthetic Aggregate as a Chip Sealing Material in Improving Skid Resistance Rahmawati, Anita
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.v14i2.538

Abstract

There are four main factors causing traffic accident : human factor, vehicle factor, road factor and environment factor. Accident data from Poltabes Yogyakarata in 2007 showed that road factor causes accident is 2.45%. In effort to achieve traffic safety, the infrastructure must be considered in the first list. This research is dealing with “Utilizing High Density Polyethylene (HDPE) Synthetic Aggregate as a Chip Sealing Material in Improving Skid Resistance”. The purpose of this research is to understand the effect of chip sealing using HDPE synthetic aggregate on the skid resistance, so that the surface pavement can provide good service for traffic and road users and the quantity of accident can be reduced. In this research the skid resistance was  measured using British Pendulum Tester such that the its skid resistance is also called British Pendulum Number (BPN). BPN is a measured based on 3 variations of aggregate weight being spreaded, that are 240 grams, 271 grams and 304 grams. The result of BPN will be correlated with the wet accident ratio, friction coefficient and stopping distance. The BPN values being obtained are 55.96, 55.6 and 53.4, respectively. The BPN was found to increase with the increase of aggregate weight in chip seal mixture. It was revealed that BPN with chip sealing using HDPE could be increased by approximately 10 % in comparison with that without chip sealing. In addition, chip sealing using HDPE can reduce the accident ratio by 47.32 %, improve the traffic safety by 47.32 %, and shorten the stopping distance. The greater friction coefficient the lower stopping distance, and the lower stopping distance the better traffic safety. 
An Integration Of The Seismic Methods In Characterization Of An Unsaturated Granitic Residual Soil Site Rosyidi, Sri Atmaja P; Nayan, Khairul Anuar Mohd
Semesta Teknika Vol 9, No 1 (2006): MEI 2006
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v9i1.894

Abstract

A comprehensive seismic survey encompassing the seismic refraction and the downhole method have been carried out in order to characterize a site of granitic residual soil.  The seismic refraction was found to be useful in the initial modeling of the subsurface and has managed to identify the water table, a bolder and the bedrock level satisfactorily.  From the downhole seismic, P-wave velocity was found to be responsived to lithology and the water table, while the S-wave velocity was found to be able to characterise the residual soil in terms of their weathering grades.  Correlations between the S-wave velocity (Vs) and dynamic shear modulus (Gseis)  were established with the SPT (N) and the static unload reload shear modulus (Gur)of the pressuremeter tests. The relationship of Vs = 2.89N + 167.84 and Gseis (MPa) = 2.39Gur + 36.03 were obtained in this study.  
Sistem Pendeteksian Kerusakan Mesin Sepeda Motor 4-Langkah Berbasis Suara Menggunakan Support Vector Machine (SVM) et.al, Hesti Susilawati ,
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.v14i1.584

Abstract

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%.
Analisis Parameter Kecepatan Teoritik Dan Nilai Beda Fase Gelombang Rayleigh Lapisan Aspal Perkerasan Jalan Berdasarkan Teori Perambatan Gelombang Pada Media Yang Homogen Dan Isotropik Sri Atmaja P Rosyidi
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v8i1.918

Abstract

The Rayleigh wave is one of seismic waves which generated from the natural and artificial mechanical source in the earth or place on the subsurface, such as landslide, earthquake, explosion, traffic vibration, machine works, etc.  The Rayleigh wave in a possible stratified of homogeneous media is a linear combination of Primary (P) and Vertically Shear (SV) waves, which satisfied the equations of elasticity with zero body forces and zero traction on the boundary of a half-space media.  In the case of a homogeneous isotropic half-space there is a unique mode of the Rayleigh waves which propagates without being sustained by any sources or external loads.  Almost 70 % of wave energy generated from the mechanical sources is the Rayleigh wave energy.  Therefore, it is a potential characteristic of Rayleigh wave that is able to be used in engineering purposes.  One of them is a spectrum analysis that is applied in transportation engineering in order to control the quality of asphaltic material.  The aim of this paper is to predict the Rayleigh wave velocity parameters and phase different value of asphaltic layer based on a fundamental theory of Rayleigh wave propagation in a homogeneous isotopic. The results have been shown that the phase different value in homogenous isotropic media is strongly influenced by field spacing of wave measurement.  The Rayleigh wave velocity parameters were easier obtained using the simple equation considering to various Poisson value. 
Efektivitas Zona Selamat Sekolah (ZoSS) di Sekolah Dasar(Studi Kasus di Kabupaten Banyumas, Provinsi Jawa Tengah) Gito Sugiyanto; Eva Wahyu Indriyati; Mina Yumei Santi; Mega Zahara Tanjung
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i2.1813

Abstract

Many elementary schools in a city or district in Indonesia located on the edge of the highway (arterial road or collector road), with many vehicles are driving at high speed. In these circumstances it is very dangerous for school children as a pedestrian or vulnerable road user. In response, the government implemented a program like School Safety Zone (Zona Selamat Sekolah ” ZoSS”) to anticipate the movement of school children who are spontaneous and unpredictable. School Safety Zone, as an instrument to reduce traffic speed in a school area, has been implemented in Indonesia from 2006. The aim of this study tried to evaluate the effectiveness of the School Safety Zone in elementary school based on the behaviour of its users, including students, parents, and travelers around the school. The approach taken with analyzes the effectiveness of ZoSS, by the research at three public elementary school in Banyumas District. The analysis was done by observing pedestrian behavior, the behavior of the parent then analyzed with reference to the guidelines issued by ZoSS General Directorate of Land Transportation Decree No. 3236/AJ 403/DRJD/2006. Based on the analysis, the behavior of pedestrians and parent were unsaved with percentage average of unsaved pedestrian behavior is 84.92% and unsaved parent behavior is 74.52%. Percentage of the average pedestrian crossing procedure 4-T is 33.16%, crossing road by walking 87.87%, facility using the zebra cross 58.90%. Direction of arrival of the vehicle in front of the school 80.26%, stopping in the spot 63.33% and putting up/down child of the vehicle on the curb side of 72.97% . It’s still not effective as many pedestrians and parent don’t have good traffic behavior.
Pengaruh Substitusi Abu Batu (Quarry Dust) Pada Nilai CBR Laboratorium Untuk Stabilitas Subgrade Timbunan Adwiyah Asyifa; Syafi’ul Umam
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i1.1830

Abstract

Quarry dust (dust mine) is a non-plastic materials from the rest of quarry stone crusher machine in range size are  0 - 5 mm. Production of quarry dust in Indonesia is very abundant. A stone crusher in the maximum work can be produced quarry dust up to 4 tons per hour. The use of quarry dust now is still less optimal. Its only used as a filler in the surface layer of pavement. So that , there are more innovation in use of  quarry  dust  to balance between produce and use. One uses the quarry dust  isfor soil stabilization.Soil stabilization is the engineering effort to improve the quality of the soil is not good and improve the quality of the soil that has actually been quite good.In pavement structural design, not all subgrade base having a good CBR value, it was low in CBR rate and it must be replacement, repair or soil stabilization. This  experimental study was conducted  in Soil Mechanics Laboratory Departement Civil Engineering University Technology Yogyakarta. Object research aresoil water content  and soil density to determine the optimum soil water content. This amount water will added in to mixture of stone dust (quarry dust) 0%, 5%, 10%, 15 % and 20% and this variation test will be aging for 48 hours. Results this research indicates that5% quarry dust added to the mixture will gave the optimum CBR amounted to 26.20%. That amount represents an increase of 19.01% from the design CBR native land by 22%.
Penentuan Modulus Geser Tanah Menggunakan Metode Analisis Multi-channel Gelombang Permukaan Susy K Ariestianty; Mohd Raihan Taha; Khairul Anuar; Mohd Nayan; Zamri Chik
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.v12i2.742

Abstract

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.
Implementasi Sensor Pyroelectric Infra Red (PIR) Sebagai Pewaktu Televisi As Sadad, Rif’an Tsaqif; Iswanto, Iswanto
Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jst.v13i2.713

Abstract

Energy dissipation is very disturbing for a country's 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.
Studi Perbandingan Pembebanan Gempa Statik Ekuivalen dan Dinamik Time History pada Gedung Bertingkat di Yogyakarta Faizah, Restu
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i2.1821

Abstract

Time history dynamic analysis is the most accurate method in seismic load calculation, but it is quite complicated and time consuming. For practical need in the field, it used the equivalent static analysis that is the simplified dynamic analysis. The main difference between the static and dynamic concept is on the building characteristic that is calculated in analysis. Dynamic concept calculates the mass, stiffness and damping, while in static concept, only calculates the mass. It is stated in SNI 1726-2012 that equivalent static analysis can only be performed for horizontally and vertically regular structure. Irregular building design, asymmetrical floor plan, and high-rise building can use dynamic analysis. This research compared the result of equivalent static seismic load and time history dynamic analysis on the reinforced concrete frame structure of 5 levels, 10 levels, 15 levels, 20 levels, 25 levels, and 30 levels. Time history dynamic analysis is done with the assistance of Matlab program and used of accelerogram of 2006 Yogyakarta earthquake as the seismic input. The result of this study shows that the calculation result of the equivalent static seismic load is quite accurate on the 5 levels building, because it gives larger requirement in designing the structure, compared to the time history dynamic analysis of the seismic load. While on the calculation of equivalent static seismic load on the 10 or more levels structure is considered as not accurate, because it gives smaller requirements in designing the structure, compared to the time history dynamic analysis of the seismic load.

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