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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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Kinerja dan Verifikasi Teknik Seismik Gelombang Permukaan Terintegrasi untuk Pengukuran Modulus Elastisitas Tanah Dasar Sri Atmaja P Rosyidi
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.v13i1.726

Abstract

An integrated-spectral analysis of surface waves (ISASW) test has been recently proposed as an alternative technique in pavement evaluation and monitoring. ISASW technique is developed from the spectral analysis of surface wave (SASW) method which has been a well known nondestructive testing (NDT) for geotechnical and pavement structures. Surface wave propagation between a set of receivers were transformed to frequency domain using fast Fourier transform (FFT). Therefore, a phase spectrum was produced for measuring the time lag between receivers. A wavelet filtering on impulse response was used for constructing an enhanced phase spectrum. Using phase different method, an experimental dispersion curve was generated. Inversion analysis based on the 3-D stiffness matrix method was then performed in order to produce the shear wave velocity profile. The elastic modulus of pavement layer was calculated based on the linear elastic theory. In this paper, the performance of ISA SW measurement for determining the elastic modulus of pavement subgrade is presented in this paper. Verification on its elastic modulus obtained from ISASW technique was also conducted by using falling weight deflectometer (FWD) test. The result shows that the dispersion curves obtained in the ISASW test are sensitive to indicate the stiffness change in each layer of a pavement structure. Stiffer layer, i.e., pavement surface layer, can be indetified by the parameter of high frequency and phase velocity range; and vice versa. ISASW technique is also able to comprehensively investigate the elastic modulus of subgrade layer in exisiting pavement without any destruction. A good agreement of elastic modulus of subgrade layer from ISASW and FWD test was also pres ented.
Studi Optimasi Peningkatan Kekuatan Bending Komposit Berpenguat Serat Nanas-Nanasan (Bromeliaceae) Kontinu Searah Muh Budi Nur Rahman; Totok Suwanda; Kuncoro Diharjo
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.v11i2.770

Abstract

The objectives of this research are to observe the bending strength composite with bromeliaceae fiber with variations of alkali treatment duration, variations of fiber fraction volume and to observe the broken section characteristics. Materials used are bromilicea fiber, resin polyester, NaOH alkali and distilled water. The composite made with printing press methods. Dimensions of specimens and bending testing methods is done by to the standard ASTM D790 (bending test). Variables in this research are fiber fraction volume in the amount of 20-50% and the soaking times in alkali treatment are 0, 2, 4, 6 and 8 hours. Visualization of the broken section is shown in the macro picture. Highest bending strength and bending tensile occur in the composite with bromeliaceae fiber for 6-hour alkali treatment of 218.06 MPa and at the amount of 4.39% in fraction volume of 34.96%. Highest bending modulus occurs with 4 hours alkali treatment of 5.92% GPa. Composite with bromeliaceae fiber without alkali treatment has broken section characteristics fiber pull out, but the composite with alkali treatment has less fiber pull out characteristics.
Pengembangan Energi Panas Bumi yang Berkelanjutan Andiesta El Fandari, Arief Daryanto, Gendut Suprayitno
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.v17i1.412

Abstract

Electricity consumption in Indonesia increases rapidly in line with population growth. Electricity contribute to promote prosperity and public welfare as well as encouraging increased economic activity. Electricity has played an important role as one of the vital infrastructure that has support of political and economic as a priority. These situations make electricity demand continue to rise. On the other hand, electricity  production from fossil fuels have not being able to meet high electricity demand. In accordance with government policies to accelerate infrastructure electricity development without ignoring its sustainability then electricity supply is currently focused on renewable energy development. One of renewable energy is geothermal. As the world’s third largest geothermal electricity producer, it is very unfortunate if that great potential from geothermal development and its utilization still not optimal. This article discusses how the sustainable geothermal energy development  in Indonesia. Geothermal energy development as one of the renewable energy becomes very important to be discussed related to fossil fuel reserves are finite, price fluctuations in energy which influenced by world economic and political situation and rising levels of greenhouse gas emission from fuel combustion.
Desain dan Simulasi UPS Multilevel Inverter Dengan Metode Modulasi Phase Disposition PWM Gede Patrianaya Margayasa Wirsuyana; Muhammad Nizar Habibi; Novie Ayub Windarko; Suryono Suryono
Semesta Teknika Vol 23, No 1 (2020): MEI 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i1.8782

Abstract

Penelitian ini memaparkan hasil perancangan dan simulasi Uninterruptible Power Supply (UPS) yang berfungsi sebagai sumber energi cadangan ketika sumber energi utama beban padam. Rangkaian UPS ini terdiri dari baterai sebagai sumber energi, konverter DC-DC boost sebagai penaik tegangan dari baterai yang disertai dengan kontrol PI untuk menstabilkan tegangan keluaran konverter, dan multilevel inverter tipe dioda clamped dengan metode modulasi Phase Disposition PWM (PD-PWM) untuk mengubah tegangan DC menjadi tegangan AC yang dapat disuplai ke beban. Pada penelitian ini akan dibahas performa dari konverter DC-DC boost yang dilengkapi dengan kontrol PI dan diode clamped multilevel inverter dalam aplikasinya sebagai UPS yang digunakan untuk menyuplai beban. Hasil penelitian menunjukkan bahwa konverter boost DC-DC mampu menaikkan dan menstabilkan tegangan DC sebesar 339,71 volt dan multilevel inverter mampu mengubah tegangan DC menjadi tegangan AC sebesar 220,41 volt dan tegangan Total Harmonic Distortion (THD) 0,39222% yang dapat disuplai. ke beban sebagai pengganti sumber energi utama. Sistem UPS ini memiliki waktu peralihan 23 milidetik.This paper presents the results of the design and simulation of an Uninterruptible Power Supply (UPS) that functions as a backup energy source when the main energy source of the load goes out. This UPS circuit consists of a battery as an energy source, a DC-DC boost converter as a voltage booster from a battery that is accompanied by a Proportional-Integral (PI) control to stabilize the output voltage of the converter, and a diode clamped multilevel inverter with the Phase Disposition PWM (PD-PWM) modulation method to change the DC voltage into an AC voltage that can be supplied to the load. This research will discuss the performance of the DC-DC boost converter which is accompanied by PI control and diode clamped multilevel inverter in its application as a UPS that is used to supply loads. The results show that DC-DC boost converter is able to increase and stabilize DC voltages by 339.71 volts and multilevel inverters are able to convert DC voltages to AC voltages by 220.41 volts and Total Harmonic Distortion (THD) voltage of 0.39222% which can be supplied to the load as a substitute for the main energy source. This UPS system has a switching time of 23 milliseconds.
Kinerja Campuran Aspal Porus yang Dimodifikasi dengan Lateks Anita Rahmawati; Ridwan Nur Hidayat
Semesta Teknika Vol 24, No 1 (2021): MEI 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i1.11724

Abstract

Aspal merupakan bahan yang digunakan sebagai perekat pada perkerasan lentur. Pada umumnya perkerasan lentur melimpaskan air hujan hanya dipermukaan perkerasan saja, akibatnya sering terjadi genangan yang membahayakan pengendara yang melintas. Salah satu alternatif untuk mengatasi permasalahan ini adalah dengan menggunakan teknologi aspal porus. Aspal porus merupakan perkerasan aspal dengan rongga be rkisar 11%-28% sehingga bisa mencegah genangan air saat terjadi hujan. Penelitian ini mengkaji pengaruh lateks sebagai bahan pengganti sebagian aspal pada perkerasan aspal porus dengan variasi kadar lateks 0%, 1%, 3%, 5% dan 7%. Spesifikasi yang digunakan adalah spesifikasi AAPA (1997). Nilai KAO didapat sebesar 5,75%, pada pengujian aspal dengan campuran lateks didapat nilai penetrasi tertinggi adalah 63,9, kehilangan berat minyak 0,2576, nilai daktalitas, titik lembek mengalami kenaikan seiring penambahan kadar lateks. Pada pengujian aspal porus dengan variasi kadar lateks diapat nilai density dan VFA mengalami penurunan seiring bertambahnya kadar lateks, nilai VMA, flow dan VIM cenderung mengalami peningkatan seiring bertambahnya kadar lateks, nilai stabilitas marshall tertinggi 592,04 kg, nilai Marshall Quotient 132,76 kg/mm, nilai Asphalt Flow Down 0,21% dan nilai Cantabro Loss adalah 14,61%.
Karakteristik Pembakaran Biobriket Dari Campuran Batubara Dan Limbah Padat Pertanian Wahyudi Wahyudi
Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i2.844

Abstract

Penelitian karakteristik pembakaran biobriket dari campuran batubara dan limbah pertanian ( ampas tebu, serbuk kayu dan sekam padi ) telah dilakukan untuk mengetahui pengaruh komposisi campuran bahan bakar,  laju aliran udara, temperatur udara preheat dan tekanan pembriketan terhadap laju pembakarannya, Karena kandungan volatile matter yang relatif tinggi pada limbah pertanian , maka penurunan massa pada pembakaran biobriket yang mengandung lebih banyak limbah pertanian akan terjadi lebih cepat. Laju pembakaran maksimum yang terjadi, semakin tinggi pada biobriket yang mengandung lebih banyak limbah pertanian .Penurunan massa juga akan semakin cepat jika kecepatan aliran udara dinaikkan , demikian juga jika temperatur udara preheat semakin tinggi. Tekanan pembriketan juga berpengaruh pada penurunan massa walaupun tidak terlalu besar.  
Pengolahan Limbah Industri Sawit Sebagai Bahan Bakar Alternatif Sudarja Sudarja; Kuncoro Diharjo; J Pramana Gentur Sutapa
Semesta Teknika Vol 10, No 1 (2007): MEI 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i1.855

Abstract

pengolahan buah sawit di industri sawit menyisakan limbah serat buah sawit yang menumpuk di lingkungan perusahaan, dan mayoritas hanya digunakan sebagai urug atau dibakar. sebaliknya, masyarakat membutuhkan bahan bakar alternatif pengganti bbm, mengingat ketersediaan bbm yang makin menipis dan harganya relatif mahal. oleh karena itu kajian tentang pengolahan limbah biofiber (serat sawit) sebagai bahan bakar alternatif dipandang penting dan mendesak untuk dilakukan.Bahan utama penelitian adalah limbah sawit, dan perekat pati. serat dan cangkang sawit yang memiliki kandungan c tinggi diarangkan, yaitu dibakar pada tabung tertutup (menggunakan retort). selanjutnya dibentuk briket arang dilakukan dengan mencampur serbuk arang dengan perekat pati kemudian ditekan pada cetakan dengan mesin pres. pengujian yang dilakukan terhadap briket arang ini meliputi uji: kadar air (berdasarkan astm d-3173), nilai kalor (astm d-5865), kadar abu (astm d-3174), kadar zat menguap (astm d-3175 )dan kadar karbon terikat (astm d-3172). Hasil penelitian menunjukkan bahwa briket arang yang terbuat dari campuran cangkang dan serat sawit memiliki nilai kalor rata-rata 7.121,57 k kal/kg, kadar air rata-rata 8,9 %, kadar zat menguap rata-rata 18,43% dan kadar abu rata-rata 4,46%. untuk menentukan kelayakan penggunaan briket arang dari limbah sawit ini, perlu dilakukan dua penelitian lanjutan, yaitu tentang persentase abu terbang dan uji ekonomis.  
Kaji Eksperimental Efektifitas Penyerapan Limbah Cair Industri Batik Taman Sari Yogyakarta Menggunakan Arang Aktif Mesh 80 dari Limbah Gergaji Kayu Jati Sudarja , Novi Caroko
Semesta Teknika Vol 15, No 1 (2012): MEI 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i1.443

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.
Analisis Kinerja Ruang Parkir di Pelabuhan Ferry International Batam Center Emil Adly
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.v16i2.4893

Abstract

The growth of motorised vehicle caused the inconvenient to find the parking space in International Ferry Harbour of Batam Center. In this study, the survey was conducted to calculate the number of the motorised vehicle that was going into and out from the harbour especially for two and four-wheeled vehicles on Saturday until Tuesday from 04.00 AM to 04.00 AM WIB. Peak hour for two-wheeled vehicle occurred on Sunday at 12.30-13.29 WIB with numbers of vehicles was 511 vehicles and with the parking lot available is 400 spaces. Thus the parking index for two-wheeled vehicles was 129.2%. Moreover, peak hour for four-wheeled occurred on Sunday at 12.00-12.29 WIB with the number of vehicles was 491 vehicles and with the parking lot available is 380 spaces. Thus the parking index for four-wheeled vehicles was 127.7%. Data on vehicles parking number and parking duration figured that four-wheeled vehicles were the highest number which was 8957 vehicles with the duration of parking less than 1 hour. Furthermore, the highest number of two-wheeled vehicles parking was 3854 vehicles with the duration less than 1 hour. The average number of parking for two-wheeled vehicles and four-wheeled vehicles were 1032 vehicles and 2277 vehicles respectively.
Otomatisasi Pembuatan Logic Design Dan Layout Pada Desain Vlsi ( Very Large Scale Integration ) Machmud Effendy
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.v9i1.879

Abstract

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.

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