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
 61   62   63   64   65 
Meningkatkan Efektivitas Arang Bakau Pada Proses Karburising Padat Baja Karbon Rendah Menggunakan Barium Karbonat Arianto Leman Soemowidagdo; Mujiyono Mujiyono
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.v12i2.731

Abstract

The effect of BaCO3 on bakau charcoal effectiveness as a carburizer for pack carburizing process was investigated. Bakau charcoal being produced from bakau trees were sifted on 30 mesh sieve. BaCO3 was then added into the bakau charcoal sieves with composition of 0, 15, 20, 25, and 30 wt %. The pack carburizing was carried out at 850 0C for 2 hours. Low-carbon steel containing 0.156 %C was used as specimen. After being carburized, all specimens were reheated at 850 0C, hold it for 5 minutes, and subsequently quenched into water at 28 oC. The result shows that BaCO3 improves bakau charcoal effectiveness as a solid media in pack carburizing proces. By adding of 20, 25 dan 30 wt % of BaCO3, it produced the case depth of 190 mm, 250 mm dan 325 mm, respectively. Martensite structure that arises on steel surface after being quenched indicates the increase of the amount of carbon atoms. 
Mesin Pemisah Dan Pembersih Biji-Bijian / Butiran Sebagai Bahan Baku Pakan Burung Olahan Rofarsyam Rofarsyam
Semesta Teknika Vol 11, No 1 (2008): MEI 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i1.775

Abstract

Bird feed  ingredient process has been done traditionally which uses winnow that moved up and down by hands, just reach 6 kg/hour by a worker, that containt of 5.75 kg of solid grains, 0.25 kg empety grains and dust. For rising work efficiency needs separating process and cleaning process bird feed ingredient between solid grains and empety grains and dust by mechanical. Those are by build bird feed ingredient separating and cleaning machine. Construction and working principle designed, according to theory of subtance free fall, which forced by horizontal windy force by blower and motored by electrical motor  ½ Hp 1450 rpm completed by belt and pulley transmition. Capacity of bird feed ingredient separating and cleaning machine can reach 90 kg/hour consist 86.25 kg solid grains and 3.75 kg empety grains and dust. 
Identifikasi Faktor Dominan Penyebab Kerentanan Bangunan Di Daerah Rawan Gempa, Provinsi Sumatera Barat M Heri Zulfiar; Tamin Tamin; Krishna S Pribadi; Iswandi Irwan
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.419

Abstract

West Sumatra is one of the province in Indonesia owning high earthquake risk. Disaster data in last one decade show the existence of occurence of earthquake generating damage of building in gross. This matter indicate that building in West Sumatra susceptance of  earthquake. One of the building susceptance is management of construction which disagree with needed conditions, law and regulation goodness which in rough, and also execution of imprecise development, imprecise build, either from planning facet and scheme, execution and observation, and also from exploiting facet and treatment. It can make infrastructure and building susceptance of disaster. When disaster happened, construction sector product becoming not function, it will generate disaster victim, or generate big loss, because destruction of other infrastructure or building. Research identify dominant factor is building susceptance represent the part of research of dissertation in the effort to less of building susceptance ( mitigation) to earthquake, by :1) sekunder data analysis of building effect of earthquake 2) perception of building characteristic and practices build 3) interview to some construction expert and earthquake. Research location in six sub-province / disaster gristle town that is; Padang city, Padang Panjang city, sub province of  South Pesisir, sub province of Tanah Datar, sub province of Pariaman and west Pasaman. Research Object at building with floor lower and confined of un-confined masonry. To know potency cause of susceptance by triangulation and sintesis among the data, fact and opinion of expert. Result of research indicate that there are 23,6 % building residing in less condition or did not maintained. To be evaluated from building form, there are 11,1% less up to standard building hold up earthquake that is having regularity of vertical form and horizontal. Pursuant to characteristic usage of brick wall with building structure there are 40,8 % having structure system susceptance of earthquake that is using inappropriate practical log and column.
Perkiraan Masa Tunggu Alumni Mendapatkan Pekerjaan Menggunakan Metode Prediksi Data Mining Dengan Algoritma Naive Bayes Classifier Asroni Asroni; Nadiyah Maharty Ali; Slamet Riyadi
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212225

Abstract

Student and Alumni data Universitas Muhammadiyah Yogyakarta is very common, and one of these is the alumni data obtained from work after the completion of undergraduate studies. Former students are given jobs caused or influenced by a range of factors. This research aims to have the grace period Classification or old alumni gain positions by triggering a process of data extraction and using the Bayes naïve classification algorithm. The algorithms used later succeeded in predicting sooner or later to get a job, the predictive results alumni can be used to make decisions to improve the quality of a university. Research on the support system using several parameters, i.e., gender, faculty, GPA, year of graduation, and job status. The data used are as much as 435, including seven years of 2011-2014 volume. The results of this study have the accuracy level of former students having the grace period come to 71% and of the calculated results of the predictions of the former students obtaining a job at Universitas Muhammadiyah Yogyakarta of the year 2011-2014 the Ensure that the work is carried out more quickly with the status of the slow to deliver the work
Analisa Perbandingan Efisiensi Sistem Struktur Pelat-Balok dengan Sistem Struktur Flat Slab-Drop Panel pada Proyek Jogja Apartment Yoga Aprianto Harsoyo; Ervan Nurfiansyah
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.v23i1.7612

Abstract

Sistem struktur dalam dunia konstruksi bangunan gedung bertingkat memiliki banyak metode dan system struktur oleh karena itu perencana harus memilih sistem struktur yang sesuai dengan kebutuhannya. Pada proyek Jogja Apartment digunakan sistem flat slab-drop panel, sistem pelat tersebut masih jarang digunakan dalam perancanaan gedung. Penelitian ini dilakukan untuk membandingkan antara sistem flat slab-drop panel dan sistem pelat-balok yang ditinjau dari segi biaya pelaksanaan, waktu pelaksanaan, dan desain strukturnya. Penelitian dilakukan dengan cara mendesain ulang satu denah pelat gedung Jogja Apartment dengan menggunakan sistem flat slab-drop panel dan sistem pelat-balok dengan metode dan pembebanan yang sama. Metode yang digunakan dalam mendesain kedua sistem pelat tersebut adalah metode desain langsung dengan peraturan SNI 03-2847-2013 sebagai dasar perhitungannya. Dari hasil penelitian didapat bahwa sistem flat slab-drop panel memiliki biaya sebesar Rp3.552.429.292 lebih murah 24,52% dibandingkan menggunakan sistem pelat-balok sebesar Rp4.706.334.233. Untuk waktu pelaksanaan sistem flat slab-drop panel memiliki waktu lebih cepat 2 hari dibandingkan dengan sistem pelat-balok. Sistem flat slab-drop panel memiliki tinggi ruang bebas yang lebih tinggi dibandingkan dengan sistem pelat-balokMany types of structural systems in the construction world of a multi-storey building make planners choose a structural system that suits their needs. Jogja Apartment project used a flat slab-drop panel system. It is rarely used in building planning so this study conducted to compare the flat slab-drop panel system and the plate-beam system in terms of implementation costs, implementation time, and structural design. The study was conducted by redesigning one plate layout of the Jogja Apartment building by using the flat slab-drop panel system and the plate-beam system using the same method and loading. The method used in designing the two plate systems is a direct design method based on SNI 03-2847-2013. This study found that the flat slab-drop panel system has a cost of Rp 3.552.429.292, it is 24,52% cheaper than using a plate-beam system (Rp 4.706.334.233). The flat slab-drop panel has a faster time of 2 days to build compared to the plate-beam system in the implementation time. The flat slab-drop panel system has a higher free space compared to the plate-beam system in structural design.
Kajian Erosi Pada Sub Das Serayu Sebagai Daerah Tangkapan Air Waduk Mrica Surya Budi Lesmana
Semesta Teknika Vol 23, No 2 (2020): NOVEMBER 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i2.12082

Abstract

Pada daerah pertanian lahan kering serta memiliki tingkat kelerengan yang curam, erosi dan sedimentasi mendai salah satu problematika yang sering terjadi. Erosi akan dapat mengakibatkan kerugian pada lahan yaitu berakibat pada turunnya produktivitas lahan akibat kerusakan sifat-sifat fisik, kimia dan biologi. Dampak akibat adanya erosi antara lain umur waduk yang menjadi lebih pendek karena terjadinya pendangkalan, elevasi permukaan dasar sungai yang semakin naik karena adanya endapan sedimen, dan juga lahan pertanian yang rusak akibat adanya timbunan sedimen. Aktivitas manusia yang beragam pada Daerah Aliran Sungai akan mempengaruhi erosi ang terjadi. Analis perhitungan erosi untuk wilayah yang luas diperlukan untuk perencanaan pengelolaan dan konservasi. Penelitian ini bertujuan untuk menganalisis tingkat erosi di wilayah Sub DAS Serayu, yang merupakan salah satu daerah tangkapan air Waduk Mrica. Analisis perhitungan erosi menggunakan rumusan Universal Soil Loss Equation (USLE) dan Sistem Informasi Geografis (SIG). Curah hujan merupakan komponen untuk menghitung erosivitas hujan. Faktor vegetasi (C) dan faktor konservasi (P) diperkirakan dari peta penggunaan lahan. Faktor panjang dan kemiringan (LS) dianalisa dari Digital Elevation Model, dan faktor erodibilitas (K) diperoleh dari interpretasi peta tanah. Selanjutnya, semua faktor dianalisis untuk menghitung laju erosi. Hasil penelitian menunjukkan bahwa Sub DAS Serayu menghasilkan erosi sebesar: 11.877.576,89 T/th. Laju erosi rata-rata pada Sub DAS Serayu tergolong dalam erosi sedang, yaitu sebesar 166.35 T/ha/th. Hasil penelitian juga menunjukkan bahwa Universal Soil Loss Equation mampu memprediksi erosi yang cepat untuk area yang luas.steep slopes. Erosion has the potential to cause land losses in the form of physical, chemical, and biological property damage, resulting in a decrease in land productivity. Shorter reservoir life due to siltation, increased river bed surface elevation due to sediment deposits, and agricultural land damage due to sediment accumulation are all effects of erosion at the watershed. For management and conservation planning, analysts on erosion calculations for large areas are required. The purpose of this research is to assess the level of erosion in the Serayu sub-watershed, which is one of the Mrica Reservoir's water catchment areas. The USLE (Universal Soil Loss Equation) formula and Geographic Information System (GIS) are used in erosion calculation analysis. Rainfall data is used to calculate the erosivity factor. The land use map was used to calculate the vegetation factor (C) and conservation factor (P). The length and slope factor (LS) were calculated using the Digital Elevation Model, and the erodibility factor (K) was determined using the soil map interpretation. In addition, all factors were considered in order to calculate the erosion rate. The Serayu sub-watershed resulted in erosion of 11.877.576.89 T/year, according to the results. The average erosion rate in the Serayu sub-watershed is 166.35 T/ha/yr, which is classified as moderate erosion. The findings also demonstrate that USLE can be used to forecast rapid erosion over large areas. 
Analisis Artificial Aging dan Perlakuan Electroless Coating Terhadap Karakteristik Gesek dan Kekerasan Komposit AA6061-Al2O3 Hanif Rinaldi; Eko Surojo; Teguh Triyono; Hammar Ilham Akbar
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13448

Abstract

Komposit merupakan bahan rekayasa yang terdiri dari dua bahan yaitu matrik dan penguat. Komposit matriks aluminium merupakan salah satu jenis komposit matriks logam yang banyak digunakan dalam dunia otomotif dan konstruksi. Penelitian ini menggunakan AA6061 dan Al2O3 yang bertujuan untuk mengetahui pengaruh perlakuan panas dan electroless coating terhadap karakteristik gesek dan kekerasan komposit AA6061-Al2O3. Pembuatan komposit menggunakan metode stir casting. Perlakuan panas dilakukan dalam tiga tahap. Variasi dari penelitian ini adalah waktu penahanan yaitu 2-6 jam. Waktu penahanan optimum pada proses artificial aging terjadi pada 4 jam. Hasil pengujian menunjukkan bahwa kombinasi perlakuan electroless coating pada partikel dan 4 h artificial aging menghasilkan kekerasan tertinggi 56,70 BHN, koefisien gesek 0,543 dan keausan spesifik terendah 1,25x10-4 mm3/Nm. Hasil karakterisasi gesekan dan pengujian kekerasan membuktikan bahwa perlakuan electroless coating efektif dalam meningkatkan kekerasan dan karakteristik gesekan yang unggul pada komposit AA6061-Al2O3.
Analisis Kelayakan Aspek Ekonomi dan Kapasitas Biodigester Model Fix Dome Plant (Studi Kasus Biodigester di Botokenceng, Yogyakarta) Fanny Monica
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.v16i2.4894

Abstract

Beside faeces and urine from cattle’s digestion, ruminants produce highly enough methane gas (CH4). This Methane Gas is one of the gases that influence the global warming and ozone decay, with rate 1% per year and still increasing. Biogas reactor is one of the solutions to solve those problems. This research aims to find out the capacity and economic feasibility of biodigester model Fix Dome Plant located in Botokenceng, Banguntapan, Yogyakarta. Primary data which are measurements and documentation, as well as the sketch (AutoCAD) and budget plan as secondary data, were analysed in this study. The formulas to obtain the capacity of biodigester are the equation of cow’s faeces volume and faeces' solvent volume. Meanwhile, Benefit Cost Ratio (B/C) and Break Even Point (BEP) were used for economic analysis. The results of this study show that the average debit was 140.7 litres/day, with average speed for different height of flume was 4.0225 m/day. Furthermore, the operational debit was 84.4 litres/minute, with average speed for varying height of flume was 2.36 m/minute. Biodigester capacity based on digester size was 4.22 m3 which can contain faeces from 2.67 cows so that the volume needed for the biodigester was 6.33 m3 since there are four cows. According to the budget plan, the investment to build the biodigester was Rp 12,821,354.50.-. The budget earned from 4 cows was Rp 6,532,165.-/year, while the expenses were Rp 1,466,160.-/year. The result of B/C analysis was 4.45 (B/C 1), and BEP analysis occurred at the 7th year with total income was Rp 37,925,750.-.
Estimasi Lokasi Gangguan Hubung Singkat pada Saluran Transmisi Tenaga Listrik Romadoni Syahputra
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.418

Abstract

In this paper, a method for short circuit fault location estimation which uses data from both ends of overhead transmission line and which does not require the data to be synchronized is described. The method fully utilizes the advantages of digital technology and numerical relaying which are available today and can easily be applied for off-line analysis. The described scheme does not require real-time communications, only off-line post-fault analysis. The method allows for accurate estimation of fault location irrespective of fault types, fault resistance, load currents, and source impedances. The simulation for single line to ground fault and symmetrical three phase fault with the variation of fault resistance of 0 ohm, 10 ohms, 30 ohms, 50 ohms, 70 ohms, and 100 ohms, respectively. The simulation has been done by using Matlab software. The simulation results of estimation error are 0.296% for single line to ground fault and 0.112% for symmetrical three phase fault, respectively. The results have shown that the method can accurately estimate the location of short circuit fault on power transmission lines. 
Implementasi Mikrokontroler Sebagai Pengendali Lift Empat Lantai Rif’an Tsaqif As Sadad , Iswanto , Jihad Anwar Sadad
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.v14i2.545

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.

Page 63 of 72 | Total Record : 715

 61   62   63   64   65 

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