cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
semesta_teknika@umy.ac.id
Editorial Address
Jln. Brawijaya Tamantirto Kasihan Bantul 55183 Indonesia
Location
Kab. bantul,
Daerah istimewa yogyakarta
INDONESIA
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.
Arjuna Subject : -
Articles 715 Documents
 40   41   42   43   44 
Analisis Pengaruh Metode Taman Hujan dalam Menurunkan Debit dan Kekeruhan Air Limpasan Permukaan Irfan Jufianto; Jazaul Ikhsan; Burhan Barid
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v16i2.4898

Abstract

The alteration in land use causes the loss of infiltration areas replaced by rigid pavement yet demand for groundwater is increasing thus unbalance in hydrology cycle occurred and water became the problem for human as the problem for this country nowadays. One of the solutions to keep the storage of groundwater is to make the rain garden in the area near the run-off sources. Nonetheless studied about rain garden only focus on the effect of pollution in the river and study about the impact of reducing run-off debit and turbidity has not been explored yet. Three infiltration models that had been used for this research were infiltration model with soil-only, rain garden, and the rain garden with infiltration hole. The results presented by the study were compared to get the efficient value from each infiltration model in reducing debit and turbidity in the unsaturated and saturated soil. The result of this study showed that the rain garden model with infiltration hole performed better result with unit time reliability for 3 minutes and higher efficiency value of 54.17% on unsaturated soil and 53.81% on saturated soil. It can also reduce the suspension in the surface run-off until 0 mg/l.
Analisis Kebutuhan Air Irigasi Pada Daerah Irigasi Bendung Mrican1 Purwanto Purwanto; Jazaul Ikhsan
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.v9i1.892

Abstract

Untuk merencanakan besarnya debit kebutuhan air yang diperlukan pada areal persawahan secara keseluruhan, maka perlu dilakukan suatu analisa kebutuhan air. mulai. Tujuan dari penelitian ini pada adalah melakukan analisa hitungan untuk mendapatkan besarnya debit kebutuhan air irigasi maksimal pada daerah irigasi Bendung. Penelitian ini dilakukan dengan cara mengambil data sekunder. Data tersebut dikompilasikan dengan metode Penman yang dimodifikasi untuk menentukan evapotranspirasi acuan (Eto), kemudian dikalikan dengan koefisien tanaman akan didapatkan nilai penggunaan konsumtif (consumtive use). Dengan faktor-faktor lainnya yang menunjang hitungan kebutuhan air seperti curah hujan efektif yang disesuaikan dengan jenis tanaman (padi/palawija), perkolasi besarnya diasumsikan dan kemudian menentukan pola tanamnya. Setelah itu dengan menggunakan rumus efisiensi tiap-tiap saluran maka kebutuhan air dapat ditentukan.Dari hasil analisis dengan menggunakan metode Penman dengan menggunakan sistem pola tanam Padi-Padi-Palawija dan menggunakan kebutuhan pengambilan 3 golongan dalam jangka waktu penyiapan lahan satu bulan, maka didapatkan besarnya nilai debit kebutuhan air irigasi maksimal masing-masing pada alternatif I yaitu 0,271 m3/dtk, alternatif II yaitu 0,254 m3/dtk dan alternatif III yaitu 0,261 m3/dtk. Didapatkan nilai debit kebutuhan air irigasi maksimal yang terkecil yaitu 0,254 m3/dtk
Perilaku Lentur pada Keadaan Layan dan Batas Balok Beton Bertulang Berlubang Memanjang M. Yusuf Amir , Djoko Sulistyo , Bambang Supriyadi
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.v14i1.570

Abstract

I cross-section of reinforced concrete with reduced weight and concrete needs (in-complete sentence), but the reduction in strength is not considerably large. The implementation of I cross-section reinforced concrete beams is quite complicated and time consuming. This research was conducted to evaluate and compare the flexural behavior and the dynamic effects of a elongated hollow square beam that equivalent with a I cross-section beam. The specimens used in 4 (four) pieces of span 3500 mm, namely each one (1) beam control (BK) in the form of T beams with flange face down and 3 (three) beams with holes (BB1, BB2 and BB3) beam T looks like a hole in the geometry and materials together with 300 mm height, width and height of flange of 600 mm and 100 mm to 125 mm wide body BK BB 200 mm in width and height while the bottom flange BK 200 mm and 75 mm. Each specimen was statically loaded until failure, and dynamically loaded up to yielding occured using a vibrator machine. It was revealed that whilst both BK and BB capacity in terms of flexural strength is not significantly different, i.e. 2.03% for BB1, 2.49% for BB2 and BB3, and 3.96% for BK; for the flexural stiffness of the experimental results in a row BB1 -62.88% -63.58% BB2, and BB3 -22.70% to BK whereas the ductility consecutive BB1 4.699; BB2 2.094; BB3 2.225; 2.102 against BK. BK test beam that is equivalent to BB either does not guarantee the material and dimensions have the same natural frequencies for the system of joint-roller beam placement BB has a higher natural frequency with an increase of 14.061% compared to BK and placement system joints BB has a natural frequency higher with an increase of 10.145% compared to BK. For BK and BB crack pattern begins in the mid-span and the maximum load at failure crack pattern of flexural failure.
An Explicit Wavelet-Based Finite Difference Scheme For Solving Two-Dimensional Heat Equation Mahmmod Aziz M; Adhi Susanto; F Soesianto
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.v8i1.917

Abstract

Metode finite difference eksplisit adalah metode yang mudah diprogram dibandingkan metode finite difference implicit atau metode-metode numerik lainnya. Selain itu, metode eksplisit itu dapat digunakan untuk menyelesaikan persamaan panas “Heat Equation” linear dalam dua dimensi. Akan tetapi, metode eksplisit itu mempunyai sebuah kekurangan yaitu keterbatasan stabilitas dari penyelesaian numerik adalah sangat ketat. Oleh sebab itu, metode eksplisit itu tidak lagi termasuk daftar metode-metode numerik yang handal yang dapat digunakan untuk menyelesaikan persamaan-persamaan diferensial parsial. Oleh karena itu, maka diusulkan untuk menggunakan analisis wavelet Haar di dalam skema numerik dari metode eksiplisit untuk mengatasi kekurangan metode itu, yaitu keterbatasan stabilitas, dengan menjaga diskretisasi dari metode eksplisit agar tidak berubah. Kekurangan dari metode finite difference eksiplisit itu sudah dapat diatasi secara signifikan oleh analisis Haar wavelet yang tidak mempengaruhi logika metode asli yatiu metode eksiplisit. 
Penyiraman Otomatis Pada Tanaman Atap Rumput Gajah Muhammad Izzuddin Al-Muqorrobin; Anna Nur Nazzilah Chamim
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i1.709

Abstract

Watering is an important step to mantain the condition of a plant, but most people dont know how good watering is, like the time of watering, watering composition that match with the plant. Almost all of green roof in any type is not using automatic system but manually watering it, that make watering the green roof become very hard to do. In this case, many people think that having a green roof is very difficult, especially in maintain it. From this problem, writer want to convince people that having a green roof is not as difficult as it look. With combining the watering methode, green roof, and surface irrigation, then writer want to make something that can help people to mantain plant especially green roof plant. The objective of this papers is to make and to know how Green Roof Automatic Watering System’s work. Using Atmega16 chip, writer made an electronic circuit that programmed by C language that will automatically watering the plant if the sensor detect the percantage above 10%. The sensor is a couple of bar that transmit voltage in between the bar past through the soil. The sensor then will transmit the data to Chip to be processed, and if they meet the condition, the IC MOC3021 will be activated, then the AC Current will automatically charge the load (pump). This electronic circuit then applied to a prototype of extensive green roof with 30’ which is a diagonal. Layering of the green roof from the first to the last is waterproof, cubical fern root (to maintain water cyclus), soil, and the plant (especially grass type). From the application, writer can make a conclusion that this green roof automatic watering system work well and can stand up to 1 month use.
Peningkatan Ketahanan Korosi Pada Material Biomedik Plat Penyambung Tulang SS 304 Dengan Gabungan Metode Shot peening dan Electroplating Ni-Cr Sunardi Sunardi; Priyo Tri Iswanto; Mudjijana Mudjijana
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.v18i2.1817

Abstract

Stainless steel (SS) 304 is widely used as biomedical materials because of its lower cost and its availability. However its corrosion resistance is lower than that of the SS 316L. The purpose of this study is to determine the influence of the combination surface treatment i.e. shot peening treatment and electroplating Ni-Cr on the corrosion resistance in simulated body fluid (SBF) of SS 304 material. The shot peening treatments were carried out using a variable period of 5, 15 and 30 minutes. Diameter steel balls of 0.6 mm with a hardness of 40-50 HRc, was applied. Pressure compressor was maintained in the range of 6 -7 kg / cm2 with nozzle diameter and the distance between nozzle and the specimen of 5 mm and 10 cm respectively. After shot peening process, the specimens were nickel-electroplated using a voltage of 2 V at current of 0.03 A with the distance between the electrode of 4 cm for 15 minutes. After nickel-electroplated process the specimens were chrome-electroplated using a voltage of 4.5 V at current 0.3 A with the distance between the electrode of 15 cm for 5 minutes. The specimen was then tested its corrosion rate in the test medium SBF using Galvanostat M 273 in the range of -20 mV s / d 20 mV. The corrosion test results show that SS 316L and SS 304 without treatment have corrosion rate respectively 1.212 X 10-3 mm / year and 4,003 x 10-3 mm / year. Which means that corrosion rate of SS 304 is 333% higher than SS 316L. The corrosion rate after treatment shot peening 5, 15 and 30 minutes followed by Ni-Cr electroplating is respectively 2.121 x 10-3 mm / year, 0.554 x 10-3 mm / year and 0 mm / year (not detected by the measurement instrument).
Analisis Kapasitas dan Efisiensi Pembersihan Mesin Pembersih Biji-Bijian Sistem Blower untuk Produksi Pakan Burung Olahan Rofarsyam Rofarsyam
Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v13i1.725

Abstract

The optimum cleaning capacity and efficiency of sheed processing in bird food production have been investigated by employing dimensional analysis. The types of grains, grain weight, blowing speed, hight and width of grain-fall were varied in order to obtaine the capacity, processing time and the cleaning degree data of the machine under investigation. The data were then analyzed to determine the product capacity-processing parameter, and efficiency-processing parameter relationships. It was con cluded that two mathematical model of product capacity-processing parameter relationship and efficiency-processing parameter relationship were governed from this study. These mathemetical models can be further used as a reference for determining the dimensions in manufacturing and operation blower system cleaning machine, in order to achieve its maximum cleaning capacity and efficiency.
Implementasi Metrik Keluaran Unjuk Kerja Network Intrusion Detection System Yudhi Ardiyanto
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2339

Abstract

Perfomance of Network Intrusion Detection System (NIDS) very important to be monitored, because this system must perform packet inspection on computer network. Failure to detect data packets can produce malicious packet sneak into networks. Snort is one of the NIDS plug ins in the form of perfomance statistics that will provide performance information in real time, in the form of comma delimited value format. It takes long time to generated performance information. Thepigdoktah is a tools that can be used to process the output performance of the NIDS to be more informative .This research has been successfully implemented on a computer network, one of the performance information that can be generated is the average packet loss amounted to 0,012%.
Perbandingan Model Turbulen Spalart-Allmaras dan Reynolds Stress Model pada Analisis Efisiensi dan Rugi Tekanan Siklon Novi Caroko; Suyitno Suyitno
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i2.769

Abstract

Two different turbulence models, i.e. Spalart Allmaras (SA) and Reynolds stress model (RSM) are used as turbulence model in the cyclone investigation via numerical simulation. The appropriate turbulence model is key parameter on the analysis of cyclone performance. The cyclone has a characteristic diameter of 30 cm. Four different inlet gas velocities, i.e. 13.6 m/s, 14.7 m/s, 16.3 m/s, and 17.8 m/s are simulated in FLUENT. It is found that the particle separation efficiency is higher 90% for all inlet gas velocities variation when RSM is used as turbulence model. The pressure drop is increasing linearly with the inlet gas velocity. The utilization of RSM can give better result of efficiency and pressure drop than SA turbulence model.    
Analisis Lendutan Model Pelat Fleksibel dengan Tiang Perbesaran Ujung dan Pelat Tidak Rapat Tanah Pada Tanah Pasir Edi Hartono
Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i1.410

Abstract

Problems in sandy soil may occur when sand has low density, uniform gradation and thick deposit. Flexible plate foundation may used in this condition but plate deflection still high. To reduce deflection and to improve 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 pile on sandy soil. Plate deflection was observed with variation of plate thickness, bottom pile enlargement, and soil-plate-pile interaction (free standing pile and piled foundation). 1,2 x 1,2 x 1,2 m box container filled with sandy soil was used as soil media. Square and rectangular plexiglass plate were used to modelled plate. Steel pipe with 2,5 cm  in diameter were used as pile model. The behavior of the plates were observed under loading (point load). The results shows that plate deflections were affected on plate thickness, bottom pile enlargement and soil-plate-pile interaction. For a ticker plate, contact surface between plate and soil was wider. For the 40 cm x 10 cm plates with base pile enlargement, deflections were found to reduced up to 21,26%. The ‘piled foundation’ on 40 cm x 10 cm plates, (installing with 20 cm pile length, and 10 cm spacing between pile), deflections were reduced 83,63% compared with free standing foundation.

Page 42 of 72 | Total Record : 715

 40   41   42   43   44 

Filter by Year

2005 2024


Reset
Filter By Issues
All Issue Vol. 27 No. 2 (2024): NOVEMBER Vol 27, No 1 (2024): MEI Vol 26, No 2 (2023): NOVEMBER Vol 26, No 1 (2023): MEI Vol 25, No 2 (2022): NOVEMBER 2022 Vol 25, No 1 (2022): MEI 2022 Vol 24, No 2 (2021): NOVEMBER 2021 Vol 24, No 1 (2021): MEI 2021 Vol 24, No 2 (2021): NOVEMBER Vol 23, No 2 (2020): NOVEMBER 2020 Vol 23, No 1 (2020): MEI 2020 Vol 22, No 2 (2019): NOVEMBER 2019 Vol 22, No 1 (2019): MEI 2019 Vol 21, No 2 (2018): NOVEMBER 2018 Vol 21, No 2 (2018): NOVEMBER 2018 Vol 21, No 1 (2018): MEI 2018 Vol 20, No 2 (2017): NOVEMBER 2017 Vol 20, No 2 (2017): NOVEMBER 2017 Vol 20, No 1 (2017): MEI 2017 Vol 20, No 1 (2017): MEI 2017 Vol 19, No 2 (2016): NOVEMBER 2016 Vol 19, No 2 (2016): NOVEMBER 2016 Vol 19, No 1 (2016): MEI 2016 Vol 19, No 1 (2016): MEI 2016 Vol 18, No 2 (2015): NOVEMBER 2015 Vol 18, No 2 (2015): NOVEMBER 2015 Vol 18, No 1 (2015): MEI 2015 Vol 18, No 1 (2015): MEI 2015 Vol 17, No 2 (2014): NOVEMBER 2014 Vol 17, No 2 (2014): NOVEMBER 2014 Vol 17, No 1 (2014): MEI 2014 Vol 17, No 1 (2014): MEI 2014 Vol 16, No 2 (2013): NOVEMBER 2013 Vol 16, No 2 (2013): NOVEMBER 2013 Vol 16, No 1 (2013): MEI 2013 Vol 16, No 1 (2013): MEI 2013 Vol 15, No 2 (2012): NOVEMBER 2012 Vol 15, No 2 (2012): NOVEMBER 2012 Vol 15, No 1 (2012): MEI 2012 Vol 15, No 1 (2012): MEI 2012 Vol 14, No 2 (2011): NOVEMBER 2011 Vol 14, No 2 (2011): NOVEMBER 2011 Vol 14, No 1 (2011): MEI 2011 Vol 14, No 1 (2011): MEI 2011 Vol 13, No 2 (2010): NOVEMBER 2010 Vol 13, No 2 (2010): NOVEMBER 2010 Vol 13, No 1 (2010): MEI 2010 Vol 13, No 1 (2010): MEI 2010 Vol 12, No 2 (2009): NOVEMBER 2009 Vol 12, No 2 (2009): NOVEMBER 2009 Vol 12, No 1 (2009): MEI 2009 Vol 12, No 1 (2009): MEI 2009 Vol 11, No 2 (2008): NOVEMBER 2008 Vol 11, No 2 (2008): NOVEMBER 2008 Vol 11, No 1 (2008): MEI 2008 Vol 11, No 1 (2008): MEI 2008 Vol 10, No 2 (2007): NOVEMBER 2007 Vol 10, No 2 (2007): NOVEMBER 2007 Vol 10, No 1 (2007): MEI 2007 Vol 10, No 1 (2007): MEI 2007 Vol 9, No 2 (2006): NOVEMBER 2006 Vol 9, No 2 (2006): NOVEMBER 2006 Vol 9, No 1 (2006): MEI 2006 Vol 9, No 1 (2006): MEI 2006 Vol 8, No 2 (2005): NOVEMBER 2005 Vol 8, No 2 (2005): NOVEMBER 2005 Vol 8, No 1 (2005): MEI 2005 Vol 8, No 1 (2005): MEI 2005 More Issue