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
 9   10   11   12   13 
Analisis Waktu Perjalanan Terhadap Pembukaan Jalur Lingkar Selatan Surakarta Menggunakan Program TFTP Suwardi, Suwardi
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Surakarta road network services high traffic volume to/from Surakarta city. It is caused by the activities are still centered. In addition, outside road network of city which is provided for traffic only passing Surakarta city is not available yet. Therefore, a Surakarta road network needs urgently to be expanded and a proposed ring-road is considered necessary. In order to anticipate the future traffic condition, effects of a proposed ring-road is studied. The aim of study is to predict the future traffic condition in terms of effective journey time after a proposed ring-road is implemented using Teacher Friendly Transportation Program (TFTP). The results show that effective journey time in 2009 and 2014 was significantly reduced after opening the proposed ring-road in the Surakarta road networks. The efficiency of journey time in 2009 was predicted in the range of 8 to 9 minutes for three alternatives and in 2014 was about 9 to 11 minutes. Meanwhile, the journey time for ring-road in 2009 was estimated in 17.1 minutes with the efficiency of journey time for alternative 1, 2 and 3 was calculated in 17.9, 10.9 and 13.9 minutes, respectively. The journey time for ring-road in 2014 was found to be 19 minutes with the efficiency of journey time for alternative 1, 2 and 3 is 20, 17.5 and 15, respectively.  
Pembuatan Alat Uji untuk Mengikat Partikel Logam yang Terkandung dalam Pelumas Akibat Gesekan Mesin Sukamta, Sukamta; Sudarja, Sudarja; Nurdarojat, Nurdarojat; Prasetyo, Agung
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

One of the factors that can affect to the quality of lubricantion is metal particle content due to friction of engine parts.  Metal particle in lubricanting oil could damage the engine parts, so it is neccessary to reduce the metal particle content which mingled in lubricant oil. The experiment was conducted in laboratory scale using power magnetic type ring neodymium possessing diameter of 19 mm and thickness of 2 mm. The experiment was conducted by flowing the lubricanting oil containing metal particle continually and put the magnets in engine so that the metal particle will be taken up by the magnets. The experiment used  three variations of time (5, 10 and 15 minutes) and three variations of valve to controlling the flow rate using. The highest  absortion of metal  particle was reached on opening valve 30 for 15 minutes. When volume the flow rate was 200 ml/s and the time was 15 minutes  the result of absortion was 7.48 % (magnet A), meanwhile for volume the flow rate 180 ml/s and the time was 15 minutes resulted in particle absortion of about 7.37 % (magnet B). When Magnet A and B used together and at the same flow rate and time, i.e. 180 ml/s time 15 minutes, resulted the particle absortion about 17.98 %.
Perubahan Kecepatan Aliran Sungai Akibat Perubahan Pelurusan Sungai Sriyono, Edy
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini bertujuan untuk mengkaji pengaruh permeabilitas tanah (k), tinggi muka air (h), diameter pipa (D), panjang pipa (L), kedalaman pipa (l), dan luas pori (Af) terhadap debit aliran melalui pipa berpori (Q). Selain itu juga bertujuan untuk menentukan formula empirik hasil analisis dimensi debit aliran (Q) yang melalui pipa berpori.Penelitian dilakukan dengan cara membuat eksperimen fisik di laboratorium yang terdiri dari bak penelitian yang terbuat dari pasangan batu bata dan pipa berpori (jumlah pipa berpori seluruhnya 9 buah), yang kemudian diisi dengan pasir dan air pada berbagai macam variasi, kemudian besarnya debit aliran melalui pipa berpori diukur dengan gelas ukur.Hasil penelitian menunjukkan bahwa beberapa parameter yang berpengaruh secara signifikan terhadap debit (Q) adalah: permeabilitas tanah (k), diameter pipa berpori (D), panjang pipa berpori (L), kedalaman pipa berpori (l), luas pori (Af), dan ketinggian air di atas pipa berpori (h).Q = f (k, Af, L, l, D, h)Adapun formulasi empirik debit yang mewakili hubungan antara Q/k.L.D dengan Af.h/L.D.l adalah sebagai berikut ini. 
Implementasi Mikrokontroler Sebagai Pengendali Lift Empat Lantai Jihad Anwar Sadad, Rif’an Tsaqif As Sadad , Iswanto ,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In large multi-story buildings stairs to connect one floor with another floor. Itulization of stairs may not be efficient, as many technological advancement created lift for high rise buildings. An elevator being electronically controlled may be used to connects all floors within the building. in roder to be able to function as intended. The elevator control system prototype being produced uses a microcontroller as a controller. The microcontroller being used is the ATmega16 type. Actuator is used as a DC motor drive rotating at 300 rpm to produce a stable rotation and meet the quite large torque. This system uses a queue keystrokes. The system has functioned well and can work as expected. Lift can work in accordance with keystrokes outside and inside the elevator.
Perancangan Overhandle System Pada Kasus Kesalahan Peletakan Gagang Telepon Fitrahadi, Julian; A, Fathul Qodir
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Faktor peletakan gagang telepon menjadi salah satu penyebab tidak siapnya (gagalnya) suatu sistem telepon dalam menerima panggilan dari telepon lain karena telepon akan selalu berada dalam kondisi sibuk (busy) walaupun tidak sedang terpakai. Kesalahan peletakan gagang telepon ini dapat terjadi karena adanya faktor kelalaian pengguna telepon, dimana telepon tidak tertutup atau tidak terletak dengan baik pada tempatnya setelah digunakan lalu bagaimana membuat suatu solusi untuk mengatasi terjadinya kegagalan penerimaan panggilan masuk pada sistem telepon kabel rumah biasa yang disebabkan oleh kesalahan peletakan gagang telepon. Untuk mendapatkan suatu sistem yang sesuai dengan kebutuhan maka diperlukan perancangan yang tepat yaitu, sistem harus memiliki rangkaian catu daya DC yang nantinya akan digunakan sebagai sumber tegangan untuk komponen-komponen yang digunakan, system harus mampu mendeteksi nada sibuk/reorder dari call progress tone pesawat telepon yang nantinya akan digunakan sebagai masukan dari sistem, sistem harus mampu memberikan pesan peringatan kepada pemilik telepon jika terjadi kesalahan pada posisi gagang telepon setelah digunakan melalui media suara yang dihasilkan oleh buzzer, bila pemilik telepon mengabaikan bunyi pesan peringatan dari sistem maka diharapkan sistem dapat menggantikan fungsi penerimaan panggilan masuk jika terjadi salah letak pada gagang telepon, bila terjadi panggilan masuk dimana posisi gagang masih salah maka sistem harus mampu mendeteksi kehadiran sinyal dering dari panggilan masuk tersebut dan memberikan peringatan jika ada panggilan yang masuk ke telepon pemilik. Hasilnya adalah perancangan dan pembuatan overhandle system pada kasus kesalahan peletakan gagang telepon ini dapat bekerja dengan baik dan sesuai dengan yang diharapkan, dengan tone detector telah dapat digunakan untuk mendeteksi nada call progress yang berupa nada sibuk 425Hz dari telepon dan sistem telah dapat mengalihkan panggilan yang masuk jika terjadi kesalahan peletakan gagang telepon. Alat ini dapat bekerja untuk jalur langsung maupun PABX.
Peningkatan Nilai CBR Laboratorium Rendaman Tanah dengan Campuran Kapur, Abu Sekam Padi dan Serat Karung Plastik Widianti, Anita
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Bearing capacity of a subgrade is one of the parameters to design the thickness of road pavement. Beside the bearing capacity, swelling behavior of subgrade must be in a narrow range to avoid crack of the pavement. This paper presents an effort to improve the soaked design California Bearing Ratio (CBR) and swelling value of soil by stabilizing with lime-rice husk ash and strengthened by randomly placed plastic fiber. In this study, the portions of lime and rice husk ash were set constant to the value of 12% and 24%, respectively. Amount of waste plastic sack fibers was used in this experiment ranging from 0.1% to 1.2% of dry weight of mixtures. The samples were tested at 7 and 14 days after mixing. The results show that the soaked design CBR value increases to 867%. As a result, swelling value decreases from 62% to 100%. The optimal improvement of the soaked design CBR was found at 0.2% of plastic sack fibers.
Analisis Lendutan Model Pelat Fleksibel dengan Tiang Perbesaran Ujung dan Pelat Tidak Rapat Tanah Pada Tanah Pasir Hartono, Edi
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Analisis Campuran Bahan Bakar Bensin Dengan Minyak Tanah Pada Pompa Air Agar Biaya Murah Yusron, Zaenal
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Mesin pompa air atau didesa sering disebut dengan diesel, sangat vital untuk petani desa yang pengairannya tergantung pada hujan. Pompa air yang digunakan merupakan pompa air yang memakai bahan bakar bensin namun seringkali didesa diganti dengan bahan bakar minyak tanah. Bensin yang beredar dimasyarakat memiliki angka oktana 88 RON dengan harga per liter Rp. 4.500,00 Sedangkan minyak tanah memiliki spesifikasi titik asap minimum 16 mm. Dengan harga Rp. 2.750,00. Bensin yang diuji sebagai sampel dibeli di POM yang resmi, sedang minyak tanah dibeli di pengecer, dengan asumsi bahwa kualitas bahan bakar yang dibeli sama dengan kualitas yang diproduksi Pertamina. Teknik analisis dengan membuat data dalam bentuk grafik untuk dilihat sejauh mana perbedaan antara campuran bensin premium dan bahan bakar minyak tanah terhadap jumlah volume air yang dihasilkan dan tingkat biaya bahan bakar yang dihabiskan. Parameter yang dipakai untuk menyatakan bahwa beaya operasinal murah adalah jumlah air yang dihasilkan dengan harga bahan baker termurah. Dengan 11 campuran (dari 0 % sampai 100%) maka  akan tampak dimana yang paling efisien. Berdasarkan analisis data yang dilakukan bahwa Waktu yang digunakan untuk mengairi sawah, tercepat : menggunakan bensin murni (campuran 0%) : 10.15 jam. Terlama : menggunakan minyak tanah murni, yakni 13.15 jam, selisih antara keduanya adalah 3 jam. Bahan bakar yang digunakan; Bahan bakar teririt : menggunakan bensin murni : 6,86 liter. Bahan bakar terbanyak  menggunakan minyak tanah murni : 8.15 liter. Selisih antara keduanya 1,29 liter. Sedangkan beaya yang digunakan,adalah beaya paling irit : menggunakan minyak tanah murni Rp. 22.408,-. Beaya paling mahal : menggunakan bensin murni : Rp. 30.871,-. Selisih antara keduanya : Rp. 8.506,-
Penghitungan Tebal Setara Metode Boussinesq-Exel dan FWD-ELMOD pada Perkerasan Lentur Hardwiyono, Sentot
Jurnal Semesta Teknika Vol 15, No 1 (2012): MEI 2012
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Calculating the Flexible Pavement System (FPS) response has initiated by Boussinesq, Burmister, Huang and more scientists around the world. Determining modulus elasticity each stratum FPS very important to note to designing the Flexible Pavement. The purpose of this study is to determine the elastic modulus of each layer in the profile Flexible Pavement Systems (FPS) with a thickness equivalent method Boussinesq-Exel and FWD-ELMOD. Tests were run on the Soekarno-Hatta Cikampek-Purwakarta-Bandung and West Java highways, Indonesia. The test results showed a good correlation between the modulus of each layer in the FWD testing with those of Boussinesq-Exel test.
Pengaruh Konsentrasi Etanol Terhadap Unjuk Kerja Dan Emisi Gas Buang Motor Bensin Pada Kondisi Idle Dan Dengan Standar Ece 83-04 Prawoto, Prawoto; Nugroho, Bagus Anang
Jurnal Semesta Teknika Vol 9, No 1 (2006): MEI 2006
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This paper describes a study an influence of ethanol concentration in premium-ethanol fuel blends on vehicle performance and exhaust gas emissions. The study is based on the vehicle test on chassis dynamometer. Exhaust gas emission was measured on idle condition and using ECE standard regulation No. 83-04. Three compositions were performed on the first step, which are 3%, 10% and 20% of volume. Performance and emission results were compared to the test results on the same vehicle fuelled with 100% premium and pertamax. The test results have shown that increasing concentration of ethanol will increase torque and power, reduce CO and HC emission, except on idle condition. 10% ethanol concentration have identical performance characteristic with the same vehicle fuelled with pertamax, with 60% less CO emission on idle condition and 30% less when using ECE 83-04 standard.

Page 11 of 72 | Total Record : 715

 9   10   11   12   13 

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