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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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Penerapan Technology Acceptance Model (TAM) dalam Pengujian Model Penerimaan Aplikasi MasjidLink Agus Mulyanto; Sumarsono Sumarsono; Thaqibul Fikri Niyartama; Annisa Khodista Syaka
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.v23i1.7802

Abstract

MasjidLink is an Android-based application to provide news and information relating to mosques in the Yogyakarta Special Region. Behavioral aspects that influence tamir when using MasjidLink are need to measure, so that can define the level of acceptance. The TAM (Technology Acceptance Model) approach was used in this research to analyze factors of takmir acceptance towards MasjidLink. The measurement of acceptance  towards MasjidLink with TAM is expected to showing the actual perspective of tamir so can  helps the further developing of this applications. Testing research instruments through validity and reliability. All research instruments have a value of more than 0.5 so that it can be declared as valid instruments. TAM variable in this study has an alpha cronbatch value of more than 0.7, so that all of these research variables are said to be reliable. Perceived ease of use has a percentage value 72.68% which states that mosque takmir agrees with the ease of use of the MasjidLink application. Perception of usefulness has a percentage 72.11% which states that the mosque takmir agrees with the usefulness of the MasjidLink application. Acceptance of the application has a percentage value 71.31% which states that the mosque takmir agrees with the acceptance of the MasjidLink application. The results of descriptive statistical analysis on TAM have the smallest percentage of variables, there is the percentage of MosqueLink acceptance with the value is 71.31%. This can be used to enhance the development of MasjidLink by focusing on the acceptance of the MasjidLink application. MasjidLink is an Android-based application to provide news and information relating to mosques in the Special Region of Yogyakarta. Currently, MasjidLink is a new mosque information management application that was launched and started to implemented by several takmir mosques in the Special Region of Yogyakarta. Takmir's acceptance of the MasjidLink application is one of the factors that support the continued use of the application. The measurement of the mosque takmir acceptance on the MasjidLink application is done by the TAM (Technology Acceptance Model) method. This study aims to evaluate the application of MasjidLink application with the TAM method so that the perception of takmir and the factors that influence takmir in using the application can be known. The research method used is a quantitative method, which uses a questionnaire as a tool to collect data on 125 users of the MasjidLink application. The results showed acceptance of mosque takmir on MasjidLink application had a positive influence on 3 TAM variables, namely the perception of user convenience 72.68%, perceived usefulness of 72.11%, and technology acceptance 71.31%. This shows that the application developer can focus on improving the acceptance of the MasjidLink application variable because the variable percentage is smaller than other variables.
Kuat Tekan dan Tarik Belah Beton Serat Menggunakan Aggregat Ringan As'at Pujianto; Restu Faizah; Dodi Agusto Wijaya; Junaidi Abdurazak; Hakas Prayuda; Hendy Wijaya
Semesta Teknika Vol 24, No 1 (2021): MEI 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i1.12084

Abstract

Beton adalah material untuk infrastruktur sipil yang sangat sering ditemukan dan digunakan di Indonesia. Beton memiliki berbagai kelebihan di antaranya ekonomis, tahan lama, ketahanan terhadap api yang tinggi dan kemudahan untuk mendapatkan bahan penyusunnya. Beton memiliki berat lebih kurang 2400 kg/m3, berat sendiri beton yang cukup tinggi merupakan salah satu kelemahan yang dimiliki beton. Tujuan dari penelitian ini adalah untuk menginvestigasi sifat dasar mekanik beton ringan yang dikombinasikan dengan fiber. Batu apung digunakan pada penelitian ini sebagai agregat kasar sehingga berat jenis dari beton menjadi berkurang. Selain itu, untuk meningkatkan daktilitas beton digunakan dua jenis serat sebagai material tambahan. Serat buatan yang digunakan berupa glass fiber dan steel fiber dengan jumlahnya divariasikan dari 0%; 0,5%; 0,75% dan 1,0% dari total berat binder. Beberapa pengujian yang dilakukan pada studi ini yaitu memeriksa sifat beton segar dan beton yang telah mengeras. Pengujian slump dilakukan untuk memeriksa tingkat workabilitas beton segar sedangkan kuat tekan dan kuat tarik belah pada umur beton 28 hari dengan benda uji berbentuk silinder digunakan untuk menginvestigasi sifat beton yang telah mengeras. Hasil pemeriksaan beton segar menunjukkan bahwa penambahan jumlah serat yang tinggi menghasilkan workabilitas yang rendah. Sedangkan sifat beton keras menunjukkan bahwa baik kuat tekan maupun kuat tarik belah dengan jumlah serat yang tinggi mengalami peningkatan dibandingkan dengan beton normal.
Karakterisasi Sambungan Friction Stir Spot Welding pada Plat Aluminium 5083 Aris Widyo Nugroho; Fajar Hari Purnomo; Muhammad Budi Nur Rahman
Semesta Teknika Vol 24, No 1 (2021): MEI 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i1.12603

Abstract

Karakterisasi sambungan las titik aduk pelat Alumunium 5083 telah dilakukan untuk mengetahui pengaruh waktu diam dan putaran pahat terhadap sambungan. Plat Aluminium 5083 dipotong menjadi benda uji dengan dimensi 100 x 30 x 3 mm. Sambungan putaran diterapkan untuk mengelas spesimen sesuai dengan standar AWS D8.9-97. Alat dengan diameter bahu 20 mm dan pin tirus disiapkan. Proses Friction strir welding (FSSW) dilakukan dengan menggunakan parameter dwell-time 5, 10 dan 15 s dengan kecepatan putar masing-masing 1500 dan 2280 rpm. Temperatur pelat di dekat pin selama proses pengelasan diukur menggunakan termokopel tipe K. Morfologi dan struktur mikro sendi diamati menggunakan mikroskop optik. Kekerasan dan kapasitas beban tarik dari sambungan juga dievaluasi. Hasil penelitian menunjukkan bahwa parameter kecepatan rotasi dominan mempengaruhi kualitas sambungan. Daya dukung tarik yang lebih tinggi ditemukan pada kecepatan putar yang lebih tinggi pada setiap dwell-time yang mencapai maksimum 3105,4 N. Semua spesimen menunjukkan kegagalan pull out nugget akibat terjadinya beban geser yang mendominasi penyebab kegagalan.
Optimalisasi Sink Mark Index Pada Produk Plastik Dengan Variasi Ketebalan Ekstrim Menggunakan Simulasi Moldflow Cahyo Budiyantoro
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2316

Abstract

Injection Molding Process is a closed cycle process involving 4 important factors that influencing product quality such as: process setting parameter, plastic material selection, product design and mold design. Ideally a plastic product is designed with uniform wall thickness since the thickness variation brought about negative effect on the final product. Those negative effects are warpage, sink mark or voids. Warpage is a bending failure of product, void cannot be observed as unfilled or holes on the cross section of the part, whereas sink mark is a deflected mark that can directly be seen on the surface of the part. Those 3 failures are normally caused by material accumulation and thermal rate differentiation. This research was a computerized based simulation using Autodesk MoldFlow Plastic Insight software to predict the 3 failures and to optimize the product quality by Sink Mark Index reduction, minimizing sink mark estimation and volumetric shrinkage  due to extreem thickness variation. The selected specimen was a brush handle, a real product that can easily be found in the market. The errors of brush handle in fact was caused by poor design and the only way to improve its quality is from process parameters point of view. There are 5 possible factors in fixing the failures, each factor possessed 3 level of values, then according to the Taguchi approach of design experiment, there must be 27 experiments to be done. After having 27 times experiments with combination of level and factors, it can be summerized that by combining low melting temperature, high injection pressure and high holding pressure, a sink mark index of 2.642% and a volumetric shrinkage of 19.28% can be obtained, and those were the minimum values representing the best results of product. The extension of holding time did not give a significant influence on the target quality.
Analisis Kapasitas Apron dan Ruang Tunggu Keberangkatan Penumpang Pesawat pada New Yogyakarta International Airport Setiawan, Danny
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221234

Abstract

AbstrakDalam mengantisipasi terjadinya keterbatasan lahan dan kapasitas penumpang seperti pada Bandar Udara Adisutjipto, maka perlu dilakukan analisis kebutuhan luas lahan ditahun yang akan datang, terutama aktivitas penerbangan di apron (sisi udara) dan ruang tunggu keberangkatan penumpang bandara (sisi darat) pada New Yogyakarta International Airport (NYIA). Metode yang digunakan pada penelitian ini adalah ICAO (International Civil Aviation Organization) dan metode forecasting. Hasil penelitian menunjukkan bahwa kapasitas apron yang direncanakan pada tahun 2046 dapat mengakomodasi 37 pesawat, dengan langkah optimalisasi melalui penerapan Gate Occupancy Time (GOT) yaitu sebesar 30-40 menit. Kebutuhan luas ruang tunggu keberangkatan NYIA pada tahun 2046 dengan kapasitas sebesar 24.163.371 penumpang adalah 10.706 m², jumlah kursi yang dibutuhkan sebesar 2.212 unit, kebutuhan gate hold room sebesar 13.272 m², dengan jumlah gate mencapai 39 unit. AbstractIn anticipating the occurrence of limited land area and passenger capacity such as at Adisutjipto Airport, it is necessary to analyze land area requirements in the coming year, especially the flight activities at the apron (airside) and airport passenger departure lounge (landside) for the New Yogyakarta International Airport (NYIA). The method used in this research is ICAO (International Civil Aviation Organization) and forecasting methods. The results of the study show that the apron capacity is planned to accommodate 37 aircraft by 2046, with optimization steps through the application of Gate Occupancy Time (GOT) of 30-40 minutes. The need for NYIA departure lounge area in 2046 with a capacity of 24,163,371 passengers is 10,706 m², the number of seats needed is 2,212 units, the needs of the gate hold room area required area is 13,272 m² with the number of gates reaching 39 units.
Studi Literatur Tentang Program Pump System Improvement Modeling Tool Untuk Penyempurnaan Kinerja Sistem Pompa Sukamta, Sukamta; Husda, Syamsul Muarif; Caroko, Novi
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i1.3307

Abstract

In the industrial world often encountered actual loads do not match the design load.  These differences lead to energy wastage. Pumping system is one of the systems that always exist in the industry. Improving of pumping system performance is an important step in saving energy. Impeller trimming is one method to improve the performance of the pump system. One of the obstacles in performing the impeller trimming method is to determine the magnitude of the impeller diameter reduction to be performed. Currently, many software developed to improve the performance of pumps and pumping systems. One of the softwares is Pump System Improvement Modeling Tool (PSIM). Imprimer trimming method is one of the features in PSIM. To be optimal in the use of PSIM in the improvement of the pump system it is necessary to conduct a literature study on PSIM to improve the performance of the pump system. In this article has been studied PSIM literature on the process of perfection of centrifugal pump system with impeller trimmer method by taking case study on hot water provider system. The method used in this literature study is by comparing the results of PSIM calculations on case studies with the pump theory of the impeller trimming method. Through this comparison will be known the advantages of PSIM and weaknesses, PSIM calculation margin error compared to the theoretical calculations. By knowing these things then it can be determined the limits of the use of PSIM in the improvement of pump system performance. The result of analysis shows that PSIM trimming impeller calculation is based more on the calculation according to affinity law than any other theory, even in the calculation there is error margin. The tendency of data is the greater the value of the reduction the greater the deviation. If based on the theory then the calculation of PSIM which can be used as a guide in calculating the reduction of diameter is a maximum reduction of 15% or 85% of the original diameter. A larger reduction of the value needs to be re-measured to the characteristics of the pump system.
Analisis Prioritas Rehabilitasi Bendung:Studi Kasus Bendung Cokrobedog, Gamping, Pendowo dan Pijenan di Kali Bedog Putri, Nanda Melyadi
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211206

Abstract

The government provided Special Allocation Budget via APBD for rehabilitation activities in order to increase the function and physical condition of the weirs. The rehabilitation performances must be run stage by stage due to the limitation of allocation budget, however, it would be continual. Hence the analysis of rehabilitation priority was needed. The case study of this research was the determination of rehabilitation priority towards the weirs of Cokrobedog, Gamping, Pendowo, and Pijenan. These four weirs were at Kali Bedog, Daerah Istimewa Yogyakarta.The method used for priority analysis in this research was Multi Attribute Decision Making method (MADM), consisted of AHP, ELECTRE, SAW, TOPSIS, and WP. The criterias used were the infrastructure conditions, the availability of water, and the command areas by the percentage weighting of assessment criteria at 57 , 29 and 14. The damage percentage of Gamping was 44.66%, ranked as serious damage. The damage percentage of Cokrobedog, Pendowo and Pijenan for each of it was 36.11%, 33.57% and 30.30%, ranked as average damage. The order of priority rehabilitation of dams tend not begin with the largest command area. TOPSIS method is a method most appropriate MADM applied in the prioritization of rehabilitation because it has a significantly different end value.
Sistem Informasi Menajemen Aset (Studi Kasus: Desa Barepan) Haris Setyawan; Asroni Asroni
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.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.
Pengaruh Waktu dan Suhu Proses Elektrolessplating Nikel terhadap Karakteristik Fisik dan Mekanik Plastik ABS Muhammad Budi Nur Rahman; Cahyo Budiyantoro; Sunardi Sunardi
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221237

Abstract

AbstrakPlastik ABS digunakan dalam industri otomotif, rumah tangga dan elektronik karena kekuatannya tinggi, keras, liat, tahan korosi, tahan panas, mudah dibentuk dan bisa dilapisi. Electrolessplating nikel adalah teknik metalizing bahan non logam agar bersifat logam. Penelitian proses electrolessplating nikel pada plastik ABS dilakukan dengan variasi suhu elektrolit yaitu 40oC, 50oC, 60oC, dan 70oC dan waktu proses pelapisan selama 4, 6, 8, 10 dan 12 menit. Karakterisasi yang dilakukan adalah mengetahui struktur mikro dan ketebalan lapisan menggunakan mikroskop optik, dan karakteristik mekanik meliputi, pengujian kekasaran,  kekerasan menggunakan Shore D Hardness dan pengujian keausan. Peningkatan suhu elektrolessplating meningkatkan kekasaran permukaan dari 0,170 µm pada suhu 40oC menjadi 0,422 μm pada suhu 70oC sedangkan semakin lama proses elektrolessplating dapat menghaluskan permukaan dari 0,70 µm untuk waktu 4 menit menjadi 0,33 µm untuk waktu 12 menit. Peningkatan suhu dan waktu proses elektrolessplating menurunkan nilai keausan spesifik dari 1,9x10-3 mm2/kg pada suhu 40oC menjadi 0,4 x 10-3 mm2/kg untuk suhu 70oC dan 2,62x10-3 mm2/kg pada waktu 4 menit menjadi 0,66x10-3 mm2/kg untuk waktu 12 menit. Suhu dan waktu proses elektrolessplating tidak banyak meningkatkan nilai kekerasan rata-rata sebesar 84,5 SDH. Proses electrolessplating nikel pada suhu 50oC menghasilkan ketebalan lapisan optimum sebesar 5,56 μm karena ion yang terbentuk semakin banyak  namun pada suhu 60oC dan 70oC ketebalannya berkurang sebesar 4,57 µm dan 3,72 µm. Penambahan waktu proses electrolessplating meningkatkan ketebalan lapisan, dari 1,29 μm dalam waktu 4 menit menjadi 3,98 μm dalam waktu 12 menit karena ion yang mengendap pada permukaan semakin banyak. AbstractABS plastic is used in the automotive, household and electronic industries because of its high strength, hardness, clay, corrosion resistance, heat resistance, easy to form and can be coated. Nickel electrolessplating is a technique of metalizing nonmetal materials to be metal. Research on the nickel electrolessplating process in ABS plastic was carried out with variations in the temperature of the electrolyte that is 40oC, 50oC, 60oC, and 70oC and coating time for 4, 6, 8, 10, and 12 minutes. Hardness and wear testing. An increase in temperature electro-less plating increase the surface roughness of 0.170 µm at a temperature of 40oC to 0,422 μm at a temperature of 70oC, while the longer process of electroless plating smooth the surface of from 0.70 µm to 4 minutes to 0.33 µm for 12 minutes. An increase in temperature and the process time electro-less plating lower the value of wear specific than 1,9x10-3 mm2/kg at a temperature of 40oC to 0,4x10-3 mm2/kg for a temperature of 70oC and 2,62x10-3 mm2/kg at the time of 4 minutes to 0,66x10-3 mm2/kg for 12 minutes. The temperature and time of process electroless-plating not much increase the value of an average hardness of 84,5 SDH. The nickel electrolessplating process at a temperature of 50oC produces an optimum layer thickness of 5.56 μm because more and more ions are formed but at a temperature of 60oC and 70oC the thickness decreases by 4.57 μm and 3.72 μm. The addition of electroless-plating process time increases the thickness of the layer, from 1.29 μm in 4 minutes to 3.98 μm in 12 minutes because more ions settle on the surface. 
Karakteristik Fisik Bahan Bakar Alternatif Campuran Minyak Jarak (CJO)-Minyak Cengkeh adhes gamayel
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2017

Abstract

Crude jatropha oil (CJO) is non edible oil that made up of triglycerides. That molecules due to CJO has high viscosity and low evaporation rate. Blending with more viscous and more volatile fuel can reduce it. In this study, CJO was blended with clove oil (CO) in many precentagesi.e. 5%, 10%, 15% and 20%. The basic fuel properties such as viscosity, heating value, and flash point were measured in accordance ASTM D445, ASTM D240, ASTM D93 respectively. The results indicate that the viscosity and the  flash point decrease while the heating value increase with an increase of concentration of clove oil. Thoseproperties have been improved because molecular interaction between eugenol and triglyceride makes molecule movement more active than before.

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