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
 19   20   21   22   23 
Studi Perbandingan Dinding Geser dan Bracing Tunggal Konsentris sebagai Pengaku pada Gedung Bertingkat Tinggi Astuti, Pinta
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Semesta Teknika

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

Abstract

All of high-rise buildings should have sufficient stiffness the structure  will existed when earthquake occurred. The addition of shear wall structure and concentrically single bracing are alternative way to increase stiffness of the structure. This research is comparating the natural period of the structure with variation of stiffener structure between shear wall structure and concentrically single bracing by taking a case study at Mataram City Apartments and Condominium, Yogyakarta. The building consists of two towers and every tower consist of 18 stories. Analytical calculations in this research based on technical data field, quality of materials, and the results of structural analysis with numerical program. The calculation based on SNI 03-1726-2002, SNI 03-1726-2012, and the Uniform Building Code (UBC) 1997 Chapter 16 on Requirements Design Structure. Three modification of the shear wall layouts in this research are use to understanding about the effect of adding shear walls and concentrically single bracing to the natural period structure. Based on the calculation, the structure has adequate capacity to support the load with the natural period of 1.83 seconds. Maximum allowable vibration time by SNI 03-1726-2002 is 3.24 seconds, SNI 03-1726-2012 is 2,59 seconds, while the Uniform Building Code (UBC) is 1.68 seconds. So, the natural period requirement for this structure is 1.68 seconds. From all models, only the last model which have sufficient stiffness with natural period that 1.66 seconds for shear wall and 1.67 for concentrically single bracing stiffener. 
Implementasi Metrik Keluaran Unjuk Kerja Network Intrusion Detection System Ardiyanto, Yudhi
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Semesta Teknika

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

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%.
Pengaruh Variasi Bahan Tambah Abu Sekam Padi dan Zat Adiktif Bestmittel 0,5% Terhadap Kuat Tekan Beton Mutu Tinggi Nugraha, Yoga; Prayuda, Hakas; Saleh, Fadillawaty
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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

Abstract

Concrete is the mixture of portland cement or hidrolyc cement, fine aggregate, coarse aggregate and water with or without additional mixture to form solid mass. The use of cement makes the concrete price more expensive, so an innovation is needed which to be use natural additive, such as rice husk ash. This research was carried by decreasing the use of cement that was replaced by rice husk ash with the variation 5%, 10%, and 15%, and 0.5% additive material (bestmittel) of the cement. Cylinder samples with the diameter of 15 cm and heigth of 30 cm were tested at the age of 28 days. The result of this research shows that the compresssive strength of the concrete was affected by the additional of rice husk ash (RHA) and additive material (bestmittel), which decrease the compressive strength every additional rice husk ash. The use of rice husk ash and bestmittel on the concrete for 3 variation which were 5 % ; 10% ; and 15% with the additive (bestmittel) 0.5%  obtained compressive strength were 32,23MPa; 31,84MPa and 27,71MPa.
Kajian Penurunan Kadar BOD Limbah Cair Tahu Pada Berbagai Variasi Aliran Hendrasari, Ratna Septi
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
Publisher : Semesta Teknika

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

Abstract

Tofu is a food that derived from soybeans that have been fermented and taken juice. Tofu is a favored food of the community because of high nutritious and cheap. As a result, many emerging industries making tofu where this activity will produce liquid waste. Tofu liquid waste contains some substances including BOD. High BOD levels should not be directly disposed into the river. Therefore before the waste disposed, the levels of BOD should be reduced in accordance with the quality standards of waste. Decreased levels of BOD can be done in several ways such as by the waste stream in a stream. On the various streams will have different flow characteristics. The flow variation among others stepping on a sudden waterfall and stepping on the sudden expansion. Variations in flow was analyzed using the equations of continuity and momentum. The sample of liquid waste taken from the industrial society in Srandakan Bantul. From the results obtained in the laboratory testing, levels of BOD is 5571 mg/L. The study was conducted by assuming a square-shaped channel with a channel width of 0.2 m and a flow of 1 m3/s. The study was conducted by assuming a square-shaped channel with a channel width of 0.2 m and a flow of 1 m3/s. From the results of the study showed that the percentage reduction in BOD in liquid waste that declined most for the Froude number from 2 to 8 are on ΔZ/ h1 = 0.8 ie from 0.0134% to 0.0237%  and the b/B = 0.4 ie from 0.0589% to 0.0733%. BOD levels of liquid waste that has experienced a hydraulic stepping on a waterfall as well as the expansion of a sudden, for the Froude number from 2 to 18 in a row is 5569.916693 mg/L to 5569.779468 mg/L and 5566.916554 mg/L until 5570.999943 mg/L.
Pengaruh Kecepatan Operasi Pompa Sentrifugal Terhadap Sensitifitas Metode Deteksi Fenomena Kavitasi Berbasis Parameter Statistik Domain Waktu Kamiel, Berli P; Ramadhan, Ray S
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
Publisher : Semesta Teknika

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

Abstract

Cavitation is one of the main concern on centrifugal pump faults that could cause component damages up to production failure in the industries. It is essential to detect and diagnose the fault as early as possible to prevent a catasthropic failure. Cavitation on sentrifugal pump could be caused by many factor, one of them are caused by the pump operating speed. This paper presents a method that able to detect cavitation by monitoring the vibrations level of the pump based on statistical analysis of time domain. This method is known as vibration monitoring technique that is undoubtedly the most effective technique to detect rotational machinery faults. The cavitation simulated on the test rig by varying the operating speed at 1000 RPM, 1200 RPM, 1400 RPM, …, 2600 RPM and by varying the size of suction valve opening. The cavitation phenomena are measured and indicated by magnitude of vibration level changes in stastical parameter such as Probability Density Function (PDF), Variance, Standard Deviation, Root Mean Square (RMS), Peak Value, Crest Factors and Kurtosis. The results show that PDF, Variance, Standard Deviation and RMS are proved to be able to detect cavitation caused by the pump operating speed variation. However, parameter such as Peak Value, Crest Factor and Kurtosis show low sensitivity and not suitable for the cavitation detection purposes.
Pengaruh Penambahan Dinding Geser (Shear Wall) pada Waktu Getar Alami Fundamental Struktur Gedung Astuti, Pinta
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Semesta Teknika

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

Abstract

The structure of high-rise buildings should have sufficient stiffness so that no damage could harm users when earthquake occurred. The addition of shear wall structure is one way to increase stiffness of the building. This research is analyzing the capacity of structural elements and the influence of shear walls in high rise buildings, taking a case study at Mataram City Apartments and Condominium, Yogyakarta. The building consists of two towers. Analytical calculations in this research based on technical data field, quality of materials, and the results of structural analysis with SAP2000. After that, this research will calculate strength of the structure. The analysis based on SNI 03-2847-2002, SNI 03-1726-2002, and the Uniform Building Code (UBC) 1997 Chapter 16 on Requirements Design Structure. Three modification of the shear wall layouts in this research are use to understanding about the effect of adding shear walls to the natural vibration time.   Based on the analysis and calculation, the structure has adequate capacity to support the load with the natural vibration period of 1.831 seconds. Maximum allowable vibration time by SNI 03-1726-2002 is 3.24 seconds, while the Uniform Building Code (UBC) is 1.698 seconds. First model can decrease the natural vibration period of 1.53 % to 1.80 seconds with a drift reduction of 11.35 % in the x axis and 35.27 % in y axis. The second model can decrease the natural vibration period by 5.08 % to be 1.73 seconds with drift reduction is 20.73 % the x axis, 39.31 % and y axis. The merged models have the natural vibration structure of 1.66 seconds
Analysis of Cellular Traffic Homogeneity in A Specific Area using Statistical Test Surahmat, Indar
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Semesta Teknika

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

Abstract

Capacity and coverage are the most important issues on providing services by cellular operator companies. The companies measure the condition of their network and services continuously including data collection, monitoring, evaluation and future prediction.  These are part of activities to maintain grade of service. In this paper, homogeneity analysis in cellular traffic data is analysed. This step is a part of evaluation of current situation which it will be used for planning purposes. It is done by processing data provided by network statistic monitoring tool. This paper limits on analysis in a particular area. The area is served by some cell surrounding the area.  The result shows a good homogeneity amongst the cell covered a certain area during low traffic (1 am to 1 pm). Otherwise, in high traffic, the serving cells are relatively different in terms of traffic variation and homogeneity test using Fligner-Killeen is more suitable
Studi Optimasi Waktu dan Biaya dengan Metode Time Cost Trade Off pada Proyek Konstruksi : Studi Kasus Proyek Jalan Bugel-Galur-Poncosari Cs. Tahap I, Provinsi D.I. Yogyakarta Priyo, Mandiyo; Sudiro, Sarwidi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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

Abstract

The important things that neededto know when planning the construction project are to optimize the time and the cost. To set the good time and the good cost for the implementation will give benefit greatly or maximum and avoid the cost of penalties for project delays. It is necessary to optimize the time and cost with creating the networking, searching for critical activities, and also calculate the duration of the project implementation and a number of resources. The purposes of this research are to know the changes in cost and time of the project implementation with a variety of additional work hours, employers, and equipments, to know the changes in time and cost of the project implementation with the additional variety of equipments and employee, and to know the comparison between the penalty cost and the additional of work hours cost, the additional of equipment cost, and also the additional of employs. The data used in this study is from the road construction project data of Bugel-GalurPoncosari Cs (Stage I). The data analysis of this research uses Microsoft Project 2010 and the method is time cost trade off. The critical path and the cost increase due to work hours additional obtain from the computer analysis of Microsoft project 2010, also the acceleration duration and cost increases due to the duration acceleration of the results obtains from the analysis method of time cost trade off. The results of this study are (1) the time and cost of the project in normal conditions with duration of 177 days and a cost of Rp 40,897,811,578.00, additional 1 hour of additional work hours obtains from crashing duration of 110.03 days, the cost is Rp 40,076,775,588.21. The addition of 2 hours additional work hours obtains from crashing duration of 62.1 days, the cost is Rp 39,633,316,095.13. The addition of 3 hours additional work hours obtains from crashing duration of 26.89 days, the cost is Rp 39,369,085,607.83. (2) The addition of equipment and employers using a duration of 1 hour additional work hours with a duration of crashing of 110.03 days, the cost is Rp 39,931,863,398.85. The addition of equipment and employers with duration of 2 hours additional work hours crashing duration of 62.1 days, the cost is Rp39,240,658,440.70. The addition of equipment and employers with duration of 3 hours additional work hours crashing duration of 26.89 days, the cost is Rp 38,733,785,415.45. (3) To accelerate the duration of the project cost with the addition of equipment and employers is efficient and cheap when compared to the addition of work hours, and also cheaper than the costs incurred if the project has been delayed and subject fined. 
Pengaruh Substitusi Abu Batu (Quarry Dust) Pada Nilai CBR Laboratorium Untuk Stabilitas Subgrade Timbunan Asyifa, Adwiyah; Umam, Syafi’ul
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
Publisher : Semesta Teknika

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

Abstract

Quarry dust (dust mine) is a non-plastic materials from the rest of quarry stone crusher machine in range size are  0 - 5 mm. Production of quarry dust in Indonesia is very abundant. A stone crusher in the maximum work can be produced quarry dust up to 4 tons per hour. The use of quarry dust now is still less optimal. Its only used as a filler in the surface layer of pavement. So that , there are more innovation in use of  quarry  dust  to balance between produce and use. One uses the quarry dust  isfor soil stabilization.Soil stabilization is the engineering effort to improve the quality of the soil is not good and improve the quality of the soil that has actually been quite good.In pavement structural design, not all subgrade base having a good CBR value, it was low in CBR rate and it must be replacement, repair or soil stabilization. This  experimental study was conducted  in Soil Mechanics Laboratory Departement Civil Engineering University Technology Yogyakarta. Object research aresoil water content  and soil density to determine the optimum soil water content. This amount water will added in to mixture of stone dust (quarry dust) 0%, 5%, 10%, 15 % and 20% and this variation test will be aging for 48 hours. Results this research indicates that5% quarry dust added to the mixture will gave the optimum CBR amounted to 26.20%. That amount represents an increase of 19.01% from the design CBR native land by 22%.
Analisis Nyala Torch Oksidasi Pada Oxy-Acetylene Terhadap Sifat Fisik Dan Mekanik Sambungan Las Pelat Baja Karbon Rendah Wisnujati, Andika; Kartika, Rivaldy M
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
Publisher : Semesta Teknika

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

Abstract

Oxy-acetylene welding is widely used in small workshops for car body repair, automobile and motorcycle exhaust, and other improvements using a maximum temperature of 3000oC that can not be done through another process. The purpose of this study was to analyze the effect of torque oxy-acetylene flame on the physical-mechanical properties in welding connection low carbon steel plates . The method used by using a low carbon steel plate 2 (two) pairs in a butt weld dimmension of  300 mm x 75 mm x 1 mm. After welding with oxy-acetylene in torch oxidation flame, the specimens were  examined through physical observation including microstructure and mechanical properties. Micro hardness vickers was used to evaluate the hardness. Tensile properties was determine using the universal testing machine. In the microstructure testing, there is a pearlite and ferrite whose become different dimensions as it is affected by the heat and air pressure of the weld. Mechanical testing that is tensile test obtained yieldpoint of the specimen A 125,17 N/mm2 and specimen B 126,55 N/mm2. The result of tensile strength specimen A 166,35 N/mm2 and specimen B 169,76 N/mm2. While the vickers test obtained the highest hardness that is 152.5 VHN in the welding area, and the lowest hardness number is 124,9 VHN in the heat affected zone.

Page 21 of 72 | Total Record : 715

 19   20   21   22   23 

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