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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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Perancangan Overhandle System Pada Kasus Kesalahan Peletakan Gagang Telepon Julian Fitrahadi; Fathul Qodir A
Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v8i2.906

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.
Analisa Kegagalan Sambungan Las Pada Tiang Penyangga Dermaga Koko Nusyi Syahputra; Aris Widyo Nugroho
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i1.700

Abstract

Welded join failure analysis of broken jetty head strut has been carried out to find out the root cause of the failure which was obverved at the ring welding. Specimens being made of unbroken and broken struts were characterized and analyzed. The results show that the chemical composition of the based metal and the strut welded  joins especially their phosporus content were close to that of the ASTM A 252 grade 2 standard.   A common phenomenon was noted on the hardness testing result where the hardness numbers of the weld metal zone were found being higher than those of the base metal. The Widmanstatens stucture was noticed on both the weld metal and the coarse grain zone.  Further examination of the macrostructures revealed that blow holes and incomplete fusions were detected on the weld metal of the broken struts.  These flaws may the root cause of the failure because they acted as an initial crack that may propagate until fracture.
Aplikasi Metode Nilai Hasil (Earned Value Method) pada Sistem Pengendalian Proyek Siti Yuliani Pujihastuti; Mandiyo Priyo
Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i2.1359

Abstract

In a project implementation, the project implementer wants the project completed on time as efficient as possible while the produced quality is in accordance with the initial plan. Therefore, in order to meet the requirements for controlling process and to minimize any deviations that can occur during the project, the earned value method is considered accurate. The aim of this study was to identify the final result of the project which will be achieved in the aspect of cost (whether the project experience gains, losses, or within budget) and time (whether the project is delayed, ended early, or on time as scheduled). The study was conducted on the 4th, 8th, 12th, 16th, and 20th weeks by using the earned value. Earned Value Method, or often called the Concept of Earned Value, is the concept of calculating project costs in accordance with the budget and the scope of job which have been completed or implemented (budgeted cost of works performed). This method combines the cost, schedule, and work performance of a project. Therefore, this method is considered effective in monitoring and controlling project activities.
Pengaruh Perlakuan Alkali terhadap Kekuatan Bending Komposit Berpenguat Serat Rami dengan Matrik Polyester Totok Suwanda; Muhammad Budi Nur Rahman
Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jst.v13i2.717

Abstract

The objective of this study was to determine the influence of alkali treatment on the flexural strength and failure mode of jute fiber waste/polyester composite materials. The materials being used in this research werewaste of jute fibers, polyester resin, where as NaOH and aquades were utilised for alcali treatment. Prior to being embedded into polyester resin to produce composite boards employing press printing techniques (press mold), the fiber was alkalitreated for 0, 2, 4 and 6 hours by soaking into a 28% volume NaOH content solution. Flexural test was carried out in accorcance with the ASTM D790 standard, and macrographs of selected fracture surfaces of the specimens were capturedfor analysis in oerder to determine the characteristics of the fracture surfaces. Test results showed that the longer the alcali treatment time in the lower the flexural stress and strain, but the the higher the flexural modulus. The composite without alkali treatment reluted in 70.39 MPa bending stress, 1.85% bending failure strain, and 3.85 GPa bending modulus, whereas the 6 hours of alkali treatment resulted in 51.70 MPa bending stress, 1.27% bending failure strain, and 4.13 GPa bending modulus. Composite with alkali-treatmed fiberdid not exhibite any fiber pull out, and also experienced debonding due to shear forces can’t afford retained by the resin.
Experimental Investigation of Seismic Parameters and Bearing Capacity of Pavement Subgrade Using Surface Wave Method Wahyu Widodo; Sri Atmaja P Rosyidi
Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i1.748

Abstract

The spectral analysis of surface waves (SASW) method is introduced as an in-situ non-destructive seismic technique where the method consists of the generation, measurement and processing the dispersive Rayleigh waves from two vertical transducers. Subsequently, the dispersive data of Rayleigh phase velocity are inverted and the shear wave velocity versus depth of the site is obtained. The dynamic stiffness parameters, i.e. elastic modulus generated from the SASW measurements are at a very small strain levels of 0.001%. At this strain level the soil is linearly elastic and the use of elastic theories is thus justified. The aim of this paper is to investigate the seismic parameters of the pavement subgrade stiffness using the SASW method and to predict its bearing capacity based on the seismic parameters. In order to determine the bearing capacity, in situ dynamic cone penetrometer (DCP) was also carried out in the same location of SASW test.  The relationship of the shear wave velocity and dynamic elastic modulus (Edynamic) of the SASW were found to be in good correlation with bearing capacity obtained by the DCP. 
Karakteristik Parkir di Rumah SakitKostati Surakarta Suwardi Suwardi
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.v13i1.723

Abstract

Parking is very crucial, mainly in the city areas. It often disturbs the traffic. Nowadays, many hospitals provide insufficient parking areas. This research was carried out in the Kustati hospital, Surakarta. The aim of the research is to study the parking characteristic that is expected t o be useful in planning and managing the future parking in the Kustati hospital. The result showed that the existence of parking maneuver and the service degree of traffic in front of the Kustati hospital is ranging between C and D because of parking influenced to be D and E. The parking influenced maneuver towards the decrease of speed found out to be y = 31.3x + 14.22. The average parking accumulation of motor cycle maximum is 701. The average maximum of parking index is 123%. The majority of parking duration is 6 up to 7 hours (29 vehicles). The parking volume is about 1757 vehicles. Parking turn over is 3.1 vehicles . Therefore, it requires 198 m2 of additional parking area. The average of maximum of car parking accumulation is 84 cars. The maximum parking index is 105%. The majority of parking duration is 5 up to 6 hours (41 cars). The parking volume is 245 cars. Parking turn over is 3.1 cars.
Studi Kerentanan Bangunan Akibat Gempa : Studi Kasus Perumahan Di Bantul Adi Setiabudi Bawono
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i1.1826

Abstract

One of earthquake mitigation activities is to know the probability of damage to buildings and the estimated loss caused by the earthquake on each typical building in an area. In developed countries attempt to predict the probability of damage to buildings caused by the earthquake have been found. One method used is a method of HAZUS (Hazard United States). In evaluating damage to buildings, one of the methods HAZUS by assessing the probability of damage to each building in an area using Fragility curve. In Indonesia, research on the Fragility Curve is still less. This study is an initial study to develop a Fragility curve which in turn will be compared with the version HAZUS Fragility curve building, so that it can be seen a typical residential buildings in Bantul, near the type of building whether in the United States. This study uses data reference damage to housing caused by the Yogyakarta earthquake May 27, 2006. Studied housing is housing that has the same type of building, which houses tembokan with retrofitting. Map data used mikrozonasi Bantul is a map Pariatmono (2008). The data collected includes data characteristic of houses and damage. House defects studied using media images or interviews with houseowners. To determine the probability of damage using FAHP (Fuzzy Analytic Hierarchy Process). Conclusions obtained from this study is that housing in Bantul are studied when compared with the type of building types URML tembokan HAZUS approach (Unreinforced Masonry Bearing Walls)
Pengaruh Faktor Lingkungan terhadap Strategi dan Kinerja Industri Manufaktur di Jawa Timur Rachmad Hidayat; Hairil Budiarto
Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i1.744

Abstract

This research examined the influence of environment factors (industrial, operational and remote) on the strategy and performance of manufacturing industries in East Java. The Structural Equation Modeling (SEM) was employed to test the hypotheses which emerged from the observed conditions. Moreover, the AMOS 4.0 was also used to perform the SEM. The results showed that the environment factors, i.e. industrial and operational environments as well as remote environments jointly affect the understanding of the environment industry matching with industry and environmental operational environment to establish its strategic objectives as an effort to achieve optimum performance manufacturing industries in East Java. Industrial environment conditions cannot be isolated from the global crisis because most industries prefer to concentric diversification strategy where new product technologies have a relevance to existing products.
Pengaruh Deposisi Lapisan Tipis Ti-Al-N Terhadap Umur Pahat Bubut HSS Sigit Hidayat Nuri
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.v11i2.766

Abstract

The surface hardness of material can be improved through appropriate technique in surface coating. There are several various techniques have been used in order to obtain an optimum result of surface coating. One of them is sputtering technique. Thin layer deposition of Ti N + Al N (titanium nitride + aluminum nitride) materials with sputtering is a modern coating process for improving material properties. The objective of this paper is to obtain an optimum result on surface hardness of HSS cutting and lifetime cutting tool. The specimen with 9.4 ´ 9.4 ´ 11 mm was coated by Ti-N + Al-N materials in various temperatures, coating times, and gas pressure ratio of Ar and N2.   Hardness test of Micro Vickers was used for 10 gf of load in this study. The optimum hardness number (VHN0,01 1756.2) was reached at 150° C for 2 hours process of pressure ratio of Ar : N2 is 1 : 1 at 3.10-2 kg/cm2. The hardness number of HSS material was found to be 847, 9 VHN0,01. The HSS Ti N + Al N, deposition on HSS cutting tool were used in order to cut medium carbon steel with 1 mm cutting thickness at 0.084 mm/rev of feeding speed. The speed was varied for 35, 45 and 48 m/min. The HSS cutting tool coated by Ti N + Al N has 107 % of hardness and 144% ~ 149 % of life time compared to the uncoated cutting tool.
Evaluasi Muka Air Cakung Drain Hilir terhadap Hujan Maksimum 2013 dan 2014 Puji Harsanto; Muhammad Arif Banjaran Sari; Surya Budi Lesmana
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.v17i1.406

Abstract

Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage system in Jakarta. Rainfall in 2013 and 2014 produced a big flood in Jakarta. Based on flood map Jakarta 2013 and 2014, there are inundated areas due to 2013’s and 2014’s rainfall. So, it is necessary to analyze the flood water level in channel floodway. Using HEC-RAS, this study aimed to evaluate the water level due to the maximum rainfall in 2013 and 2014. HEC-RAS is a tool for 1D hydraulic modeling and has reliability in routing of canal water level or river flooding. The results show that the maximum rainfall in 2013 provides a significant increasing of water level in Cakung floodway compared with the maximum rainfall in 2014. Soon, the need for canal normalization to reduce flood water level in Cakung floodway should be considered.

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