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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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Keamanan Rumah Menggunakan Transduser Ultrasonik Sebagai Pendeteksi Gerak Qodir, Fathul; Sudarsono, Bambang; P, Bledug Kusuma
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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Abstract

Ruangan yang penuh barang-barang berharga memerlukan sistem keamanan  elektronis yang bisa langsung dipantau. Transduser ultrasonik dapat menjadi alternatif solusi untuk mengamankan suatu ruangan yang butuh pengawasan secara otomatis. Transduser bisa dilengkapi buzzer atau sirane yang berbunyi sebagai alarm atau terkoneksi dengan telepon rumah, sehingga akan men-dial up telepon rumah jika ada seseorang yang tanpa ijin memasuki ruangan tersebut. Jadi, selama didalam ruangan tersebut tidak ada benda yang bergerak maka alarm tidak akan berfungsi. Jarak jangkauan maksimum dari alat ini adalah 3,5 meter (tergantung sudut antara pemancar dan penerima) dengan waktu rambatan selama 10,19.
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.
Aplikasi Metode Work Study pada Proyek Konstruksi (Studi Kasus Rusunawa LANUD TNI AU Adi Sutjipto Yogyakarta) Priyo, Mandiyo; Nasrudin, Gayuh Agus
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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Abstract

Work study method is one of the management approach that use for study about the productivity of workers. Work study can be applied in many cases, one of which is the construction of Rusunawa TNI AU Lanud Adi Sutjipto Yogyakarta. Chosen plant project Rusunawa TNI AU Lanud Adi Sutjipto Yogyakarta because this project uses a system of precast concrete in construction. Precast concrete systems is still quite rarely used in Yogyakarta so that this is makes the researchers reviewed the project to study the case. This study aimed to compare the time between installation plan (time schedule) and the actual installation time also to know the time clean installation of structural elements. In addition, this study also aims to determine the cost of erection of a single structural element. This study utilizes the basic time data by consider relaxation allowance and contingences for the purpose to eliminate subjectivity in assessing both. Basic recording time is using a stopwatch. Whereas the standard time value can be from basic time coupled with relaxation allowance and contingences. The results of this study have shown that the value of the standard time for the installation of columns, beams and plates is 13.63163 minutes; 8.505156 minutes; 8.465704 minutes. Obtained also the cost of erection of columns, beams and slabs of Rp 24629.96; Rp 15710.91; Rp 15710.91.
Konsep Pengatur Lalu-Lintas Sinkron Adaptif Kepadatan Untuk Solusi Minimalisasi Durasi Waktu Tunggu Kendaraan Kurniawan, Freddy; Al Hasibi, Rahmat Adiprasetya
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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Abstract

To minimize travel time in a highway, some traffic controllers must be synchronized to the other. Intersection controllers of an area are interconnected with a communication network through which synchronization information is exchanged. The main purpose of synchronized traffic control system is to minimize the waiting time of almost all vehicles in each traffic light. Green and duration time of all traffic control system are derived from some parameters such as adjacent green time, vehicle speed and acceleration, and estimation of travel time.  
Kaji Eksperimental Efektifitas Penyerapan Limbah Cair Industri Batik Taman Sari Yogyakarta Menggunakan Arang Aktif Mesh 80 dari Limbah Gergaji Kayu Jati Novi Caroko, Sudarja ,
Jurnal Semesta Teknika Vol 15, No 1 (2012): MEI 2012
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Abstract

Utilization of teak wood saw scratches can be optimized by processing it becomes active charcoal which possesses higher economic value. The purpose of this study is to obtain mesh 80 activated charcoal made from teak sawing industrial waste and to determine it’s effectiveness in adsorbing heavy metals pollutant Cd, Pb, Cr, and colouring agent in liquid waste of batik industries. The charcoal is produced at ~5000 oC retort either for 4 hours or until white colour smoke does not appear. Charcoal was activated using H2SO4 at temperature of 5000 oC for 30 minutes in a furnace. There were 2 variables in this study, i.e weight of the activated charcoal (10, 15, 20 grams) and duration of the stirring (5, 10,15 minutes). Result of the research shows that activated charcoal made from teak wood saw scratches can be used as adsorbent in the liquid waste of batik industries such as heavy metals Cd, Pb, Cr, and dark colour. The colour gradation was found to decrease from 12600 TCU to 198 TCU, Pb content decrease from 0,189 mg/l to less than 0,0093 mg/L, Cd content decrease from 0,213 mg/l to less than  0,0093 mg/L, while Cr content decrease from 2,03 mg/l to 0,4205 mg/l.
Otomatisasi Pembuatan Logic Design Dan Layout Pada Desain Vlsi ( Very Large Scale Integration ) Effendy, Machmud
Jurnal Semesta Teknika Vol 9, No 1 (2006): MEI 2006
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In making of design VLSI ( Very Large Scale Integrated Scale Integration ) is needed planning of Logic Design and Layout. The function of making of Logic Design is to translate existing case study into truth tables and then it is described into logical gates. In order to make Logic Design easier, it is required a software, the name is DSCH2. It can simulate result of truth tables, beside that it has ability to make verilog file ( one of  high language program HDL ).Layout represents form of pattern to be used in making IC ( Integrated Circuit ), where form of pattern to be made have to proper by Logic Design which have been made. In making of layout used a software, the name is MICROWIND2. This software is able to read verilog file that produced by DSCH2. In this research, we build logic design and layout for basic logical gates, such as NOT, AND and SOP ( Sum of Product ). They were made from MOS and CMOS materials.
Dampak Parkir Khusus Wisata Terhadap Simpang Bersinyal Jalan Perkotaan: Studi Kasus Persimpangan Ngabean, Yogyakarta Mahmudah, Noor; Tubagus, Adhytia
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
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The development of Special Region of Yogyakarta has been occuring rapidly due to this region is well known as student city and the primary tourism destination in Indonesia. One of the transportation problems related to the tourism activities is traffic conflict due to parking area of tourism bus in Ngabean, Yogyakarta City. Therefore it is needed to evaluate signalized junction around the parking area in order to reach the optimal performance. The study carried out among other by conducting field survey to the existing condition (performance) of signalized junction either in the weekend (Saturday) and weekday (Monday), especially by evaluating the degree of saturation (ds). The analysis results showed that the degree of saturation in the weekend is 0,89, which is higher than the allowed one (ds=0,85). Since the degree of saturation in the weekday is 0,76 so it is relatively good. The scenarios (model) applied to improve the overall junction performance are by estricting (prohibiting) left turning on red (LTOR) and by carrying out road widening. The final result obtained from the scenario (model) is the degree of saturation (ds) becomes lower than the allowed value (0,83<0,85) for all approaches in the signalized junction. 
Identifikasi Pola Aliran Dua Fasa Uap-Kondensat Berdasarkan Pengukuran Beda Tekanan pada Pipa Horisontal Sukamta, Sukamta; Indarto, Indarto; Purnomo, Purnomo; Rohmat, Tri Agung
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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An experiment of two-phase flow patterns of steam-condensate based on differential pressure measurement in horizontal tube was conducted by varying the flow rate of the steam. The experiment utilised annulus pipe with inner section test pipe was made from copper and outer section was made from Galvanized Iron Pipe (GIP) wrapped with a 10-mm-thick insulation. The pipe was 1.6 meter length, and 4 inch outer diameter and 17 mm inner diameter. The two-phase flow regime was investigated based on pressure gradien between its inlet and outlet. In order to support the result, visualition was conducted using a ¾ inch diameter and 1.3 m length of transparent pipe connected with the test pipe section. Five variations of steam flow rate ranging from 0.00211361 m3/s to 0.007078511 m3/s were selected. The results show that for lowest steam flow rate, stratified flow pattern was identified while for the ot her variations, stratified, wavy, plug and slug flow pattern were observed. Wavy flow pattern occured on transition of stratified to slug or plug. Annular flow pattern was not observed in this experiment. Generally speaking, an increase in steam flow rate resulted in a more significant pressure gradient signals.
Kompresi Citra Medis Menggunakan Alihragam Kosinus Diskret Dan Sistem Logika Fuzzy Adaptif Soesanti, Indah
Jurnal Semesta Teknika Vol 11, No 1 (2008): MEI 2008
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The required of bandwidth for communication of digital image data is increased. Limited channel capacity favors image compression techniques. These techniques attempt to minimize the number of bits needed to represent an image and to reconstruct it with little visible distortion. The image data compression techniques reduce memory of storage data and time needed to transmit data. One of the image data compression methods is using Discrete Cosine Transform and Adaptive Fuzzy Logic. The objective of this research is compressing medical image using Discrete Cosine Transform and Adaptive Fuzzy Logic System. Discrete Cosine Transform is applied to find the data will which be encoded and Adaptive Fuzzy Logic System is applied to classify sub image into certain class. The class classification of a sub image is according to their AC energy levels. The systems assign more bits to a sub image if the sub image contains much detail (large AC energy) and less bits if contains less detail (small AC energy). The result of the research shows that the accurate calculation of AC energy determines class classification of sub image and bitmaps used for image data compression must be matching with characteristic of image. Bitmaps used for image data compression determine compression ratio and reconstructed image quality. The medical image compression with ratio of 1:4.8028 result in a reconstruction image with SNR of 63.8197 dB, and visually shows that the image is similar to the original image without significant error.
Uji Beban dan Analisis Lendutan Model Pelat Fleksibel yang Didukung Tiang-Tiang pada Tanah Pasir Hartono, Edi
Jurnal Semesta Teknika Vol 16, No 1 (2013): MEI 2013
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Sand commonly has a good bearing capacity. Problems may occur when sand has low density and thick deposit. Flexible plate foundation may be used in this soil but plate deflection may be still high. To reduce deflection and improving soil density, piles were used to support the plate. Installing piles made foundation system stiffer. The objectives of this study are  to studies about behavior of plates and plate with a pile of sand on the ground, influence of plate thickness , pile length and spacing of the pole deflection, and the influence of the bond between the plate and the deflection of the pile .In this study is used test box of 1.2 m depth, 1.2 m width, 1.2 m length, and 1.0 m depth filled out with sand. Plate models were made from plexiglas of rectangular and square geometry. Piles were of steel pipesof 2.5cm diameter. Some parameters were as follows : plate thickness, plate geometry, pile length (L), pile spacing (s), bounding between plate and pile (fix or free), ’piled’ and freestanding foundation, and base pile enlargement. The behavior of the plateswere observed under loading (point load). The result shows that plate deflections were affected by the method of pile installation, plate thickness and pile length. For a ticker plate, contact surface between plate and soil was wider. For the 40cmx10cm plates with fix end pile, deflectionswere founf to reduced up to 70% compared with free end pile. The ’piled foundation’ on 40cmx10cm plates, L=20cm, s=4d, deflections were reduced 83,63% compared with free standing foundation.

Page 18 of 72 | Total Record : 715

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