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
 26   27   28   29   30 
Perbandingan Tebal dan Analisis Kerusakan Perkerasan Lentur Menggunakan Program KENPAVE dan Metode Asphalt Institute Setiawan M, Dian; Rahmawati, Anita; Setiawan, Iwan Bagus
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212216

Abstract

The mechanistic-empirical method is one of the techniques used in the design of pavement thickness. Maospati-Sukomoro Road is the primary access to Magetan City which is traversed by heavy vehicle traffic. This research was conducted with the objective to design the pavement thickness and to analyse the pavement performance against fatigue cracking and rutting. Bina Marga 1987 and AASHTO 1993 were used as the empirical method in this research. The results then investigated with KENPAVE program as the mechanistic method. The calculations showed that the Bina Marga 1987 produce Nd value of 7,52x105 and Nf value of 5,77x1012 whereas the AASHTO 1993 produce Nd value of 2,12x109 and Nf value of 1,42x1011. The result indicated that the designed pavement thickness based on the Bina Marga 1987 method is unable to serve the planned traffic load and will be damaged if there is no immediate maintenance work. In another side, the designed pavement thickness based on the AASHTO 1993 method is capable of serving the planned traffic load.
Penjernih Kabut Asap Kebakaran Hutan dengan Media Plasma dan Karbon Aktif Terintegrasi Isnan, Muhammad; Rofiq, Ainur; Hasanudin, Ibnu Awal; Thoharudin, Thoharudin
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

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

Abstract

Smoke haze from forest fires consists of Volatile Organic Compounds (VOC) and particulate matter which has micro size that can cause the respiratory disorders. Therefore, the device to reduce the matters is necessary to prevent the respiratory health including the lung. One of the many methods is using plasma and activated carbon for eliminating the matters from the air that was conducted in this study. Smoke haze was modeled as exhaust gas obtained from rice husk combustion. The velocity of gas in the cleaning device was controlled in various velocities, namely 0.3, 0.9, 1.2 and 1.5 m/s. The calculation of smoke haze particulate matter and VOC was conducted in a simple method by using cutton as filter media to separate the particulate matter and VOC from the gas. This study resulted that the increasing of velocity affected the increasing of particulate matter and VOC filtered on the cutton. The plasma utilisation on the device affected the reduction of particulate matter and VOC filtered on the cutton. The application of both plasma and activated carbon in the device could achieve the best performance of eliminating the particulate matter and VOC indicated by the clean cutton obtained after filtering. The highest efficiency of particulate matter and VOC removal was achieved by applicating both plasma and activated carbon with gas velocity of 1.5 m/s, namely 96.1 %.
Simulasi Pengaruh Jumlah Lubang pada Ring Fiksasi Eksternal untuk Tulang Tibia Krisdiyanto, Krisdiyanto
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212218

Abstract

External fixation is a device that is placed out of soft tissue. External fixation device is used to heal open fracture. Open fracture is fracture that soft tissue is broken. That device consist of pin, rod, and clamp. We should pay attention of external fixation stiffness. Number of rod can be increased to get this device more stabil. That device should be stabil so fracture position and pin track doesn’t move. External fixation that consist three rod usually   use rin. This research aims to get the effect of external fixation ring holes number to stiffness.
Deteksi Kavitasi Berbasis Getaran Pada Pompa Sentrifugal Menggunakan Principal Component Analysis (PCA) Kamiel, Berli Paripurna; Kausar, Ikhsan Aprima
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212219

Abstract

A centrifugal pump is one type of pumps that widely used in industries. Its mechanism which creates pressure changes may cause cavitation. Cavitation phenomenon that is not properly maintained may results fatal breakdown leading to high economic losses. Therefore, research is needed to find and develop a method that can detect early cavitation phenomena and identify it at several levels as well. This paper presents a method that can detect cavitation by monitoring the vibrations level of the pump based on statistical analysis of time domain and Principal Component Analysis (PCA). Vibration data is collected, trained and tested for each cavitation level. Training data is normalized and trained for each cavitation level using PCA which produces data loading matrix. The loading matrix is then multiplied by the testing data which gives a score matrix used to classify cavitation level of the centrifugal pump. The result shows that the method of domain-based PCA is successful in transforming the original data of 7 statistical parameters to 7 principal components (PC) with maximum variant. Three PCs gives 93.68% variants which can clearly identify and classify the differences between normal, early, intermediate and fully developed cavitation in the centrifugal pumps.
Pembuatan Aluminium Berpori dengan metode Metalurgi Serbuk Berbahan Amonium Hidrogen Karbonat ((NH4)HCO3) sebagai Space Holder beserta Karakterisasinya Nugroho, Aris Widyo; Iswanto, Iswanto
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212220

Abstract

The reseacrh on fabrication of porous aluminum using powder metallurgy technique with amonium hidrogen karbonat as space holder has been carried out. The space holder powder with various space holder mass fraction of 20%,30%, 40% and 50% in 5 gram of total mass and the aluminum powder were put into a can for mixing process. Afterward the mixed powder was compacted at 300 kg/cm2 to obtain the green body. Density of the green body was then determined by measuring its dimension and the mass. Following this, the green body was put in a furnace and heated up to 200oC with holding time of 60 minutes for space holder removal. The second heating up was carried out up to 650oC with holding time of 60 minutes for sintering process and the furnace was then switched off for cooling. Porosity of the sintered porous aluminum was calculated and its microstructure was examined using an optical microscop. The compressive strength of the porous material was evaluated using universal testing machine. The result show that the porosity increases with an increase of the mass fraction in the range of 56-74% with the compressive strength in opposite way. The strength was found in the range of 1.2-15.7 MPa. All specimens show a typical britlle materials.
Sistem Informasi Menajemen Aset (Studi Kasus: Desa Barepan) Setyawan, Haris; Asroni, Asroni
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212221

Abstract

Barepan Village is one of the villages in Cawas sub-district, Klaten, Central Java. In 2017 Barepan Village has owned a new building as a means of village administration and obtains assets that support the implementation of government such as computers, tables, chairs, and others. However, asset management is currently not going well and does not have a unique asset database to facilitate the management and tracking of its assets. This caused the difficulty of conducting asset track which made it difficult for asset managers to know the condition of the asset was right, damaged or lost. Therefore, an information system is needed which has the objective to be able to run the business process of asset management to be neat and structured so that asset managers can efficiently manage and track assets. The process of designing an Asset Management Information System using the waterfall model software development method begins with needs analysis, design, coding, testing, and maintenance. From the design stage, it was then created with Code Igniter in the form of a PHP framework with the MVC concept so that a website-based Information System with the MVC concept was produced. Verification and validation are then carried out to determine the suitability of the system design with the Asset Management Information System final results that have been made. Finally, an asset information system can be obtained that fits your needs and archives assets well.
Penerapan Algoritma C4.5 untuk Klasifikasi Jenis Pekerjaan Alumni di Universitas Muhammadiyah Yogyakarta Asroni, Asroni; Respati, Badrahini Masajeng; Riyadi, Slamet
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212222

Abstract

The development of education in Indonesia has increased very rapidly. One of the things that have become a benchmark for success in the quality of education at the university is the kind of job getting graduates after graduation. This research aims to identify factors that have an impact on the type of job classification method based on the C 4.5 alumni algorithm. The methodology of this research begins with the study of literature, the identification of a process of data extraction, data selection, data collection, data processing, data testing, and DA conclusion. This research uses some features of the data on a few faculty members, the year of graduation, the annual completion rate, and the strength as a classification performance parameter. Graduates data used up to 259, and consisted of 3 faculties of Economics, medicine and engineering forces from 2001-2013 and graduated from 2011-2016. The research results that have been done is if it comes from the Faculty of Economics, in 2011 and 2012 the majority of work in the private sector has passed, if it comes from the Faculty of Medicine with the years 2011 and 2012 graduated with a cumulative labor rate of between 3 to 3.5 majority working in The private sector, 2012 with a GPA between 3 and 3.5 working in the Private Sector. Finally, the C4.5 algorithm is suitable for the classification of alumni work types.
Worldwide Hot Mix Asphalt Layer Application and Scrap Rubber and Bitumen Emulsion Studies on Railway Track-Bed Setiawan, Dian M
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212223

Abstract

Researchers around the world have performed various studies on reinforcement of track-bed and mitigation of ballast deterioration. This paper objective is to conduct a literature review comprehensively to analyse and discuss the development of rubber, bitumen emulsion, and asphaltic layer usage on railway track-bed to study the proposed alternative of Indonesian unconventional rail track design concept. Various asphalt track-bed concept around the world have been reviewed (Germany, USA, Italia, Japanese, France, Spain, and Austria). Research on scrap rubber and bitumen emulsion in railway track-bed also examined in this paper. There are no researchers’ uses these three methods together in their study. In fact, each design has its benefits and limitations, so if these three methods are combined, then they will complete each other and will produce better output. The author suggests developing a new track structural components design that combined asphalt layer, scrap rubber, and bitumen emulsion. This new design expected to have capabilities to serve high-speed railway and existing railway track corridors more cost-effectively compare to the conventional tracks in consequence of their potential to have greater structural stability, considerably lower maintenance works, and more service-life. It can serve the train journey with higher speed and higher axle load.
Pemeriksaan Material pada Pembangunan Rumah Non-Engineered di Daerah Rawan Gempa Dusun Serut, Palbapang Kabupaten Bantul, Yogyakarta Zulfiar, Muhammad Heri
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212224

Abstract

Bantul Regency is a region with high level of seismic activity in Indonesia. Buildings that have the highest risk of collapse to earthquake are non-engineered buildings or residential buildings built without planning or not according regulation. This study aims to know contruction practices and material examination on non-engineered buildings in earthquake prone areas in accordance with the Indonesian National Standard. The object research is the construction of non-engineered building in Serut Village, Palbapang, Bantul Regency. The testing of material construction materials include: concrete test, reinforcing steel test and bricks test. the material are tested on the laboratory of Universitas Muhammadiyah Yogyakarta.  The observations and measurements to the practices of construction consist of: concrete sloof with size 15 × 20 cm with the main reinforcement 4Ø12 and beugel reinforcement Ø6-150; column with size 10 × 15 cm with main reinforcement 4Ø10 and beugel reinforcement Ø6-150; the concrete mixture is made manually with a composition 1 cement: 3 sand: 2 gravel; Brick size 4.35 cm x 12.036 cm x 23.902 cm class criteria M-6 module. Laboratory material test results showed: steel reinforcement diameter Ø 10 mm obtained tensile strength (fy) 401.52 Mpa; Ø12 mm diameter obtained tensile strength (fy) 393,736 M.Pa; concrete have average compressive strength of 181 kg/cm2; brick test have average compressive strength of 20.03 kg/cm2. The conclusion of contruction practices on non-engineered buildings in earthquake prone areas are adequate on major earthquake, the quality of construction concrete and reinforcing steel are fulfilling the criteria and requirements of the Indonesian National Standard, but quality of material brick is not adequate standar. 
Perkiraan Masa Tunggu Alumni Mendapatkan Pekerjaan Menggunakan Metode Prediksi Data Mining Dengan Algoritma Naive Bayes Classifier Asroni, Asroni; Ali, Nadiyah Maharty; Riyadi, Slamet
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

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

Page 28 of 72 | Total Record : 715

 26   27   28   29   30 

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