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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 24 Documents
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Search results for , issue "Vol 20, No 2 (2017): NOVEMBER 2017" : 24 Documents clear
Asesmen Cepat Kerentanan Bangunan Sekolah Muhammadiyah Terhadap Gempabumi di Kecamatan Kasihan Bantul DIY Faizah, Restu; Syamsi, Muhammad Ibnu
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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School buildings are included as buildings with risk category IV (SNI 1726: 2012) because it is potentially causing multiple casualties if earthquakes occur during school hours. Therefore the readiness of school buildings to face the earthquakes should be prepared well. First of all, a rapid vulnerability assessment of the existing building under earthquake needs to be conducted. If the buildings are vulnerable then it should be followed by a strength check. This research objective is to assess the vulnerability of Muhammadiyah school buildings which are located in Kasihan sub-district of Bantul Regency, using Rapid Visual Screening FEMA 154-2002. There are 8 buildings, consist of elementary, middle school, and senior high school which are scattered in Tirtonirmolo, Tamantirto and Bangunjiwo, Kasihan, Bantul regency. According to FEMA 154-2002, the observation result finds that 4 schools indicated to have structure vulnerability under earthquake hazard so they need further analysis to know more detail about their strength. While the other 4 buildings do not need further analysis. The results of this study can be used as a recommendation for the Muhammadiyah Basic and Secondary Education Council (Majelis Pendidikan Dasar dan Menengah) to conduct more detailed testing for school buildings that are have vulnerabilites. In addition, this research method also can be extend to school buildings or non-school buildings in other areas. 
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
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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.
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
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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. 
Perancangan Database Pada Sistem Asessmen Dan Pemetaan Hasil Asessmen Berbasis Tag Sebagai Pembantu Penyusunan Strategi Pembelajaran Kurnianti, Apriliya; Angguningtyas, Angguningtyas; Isnanda, Reza Giga
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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The Assessment and Mapping System of Tag-Based Assessment Results is an online-based system that aims to assist teachers and students in recording and mapping the assessment results for college admission. Information from the recording and mapping is very useful in helping the preparation of learning strategies and strategies to face the next exam. To support this assessment system required a database design. In the design of the database, the design is divided into 4 stages of Data Collection and Analysis, Conceptual Database Design, Logical database design, and Physical Database Design. The design of a conceptual database includes anyone involved in the system, what inputs are required, and what information (output) is desired from the database. While in logical database design, including the determination of Entities and attributes, determination of primary key, Entity Relationship Diagram (ERD). In the physical design, including ERD conversion to table form, normalization and implementation into the form of tables created on MS SQL Server. From the design of the database produces tables without anomalies, ie Eye, Student, Teacher, Testing, Problem, StandardValues, Tags, Groups, GrupMember, Member, EventUjian, Nilai, NomorSoal, PesertaUjian, Clipbooard, and OnGoingExam tables.
Optimalisasi Desain Frame Sepeda Menggunakan Software Autodesk Inventor 2015 Sunardi, Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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Bicycles become one of the environmentally friendly land transportation and are increasingly demanded by wider community. Frame a main component of the bikes that must safely be designed because it is the haviest part compared to the other components. MUSTANG hybrid bikes use steel Hi-Ten (High Tensile Steel) for their frames. The density of such material is relatively high in comparison with other frame materials such as aluminum alloy, carbon fiber, and titanium. Thus, it needs to be redesigned to optimize frames in terms of mass, stress, displacement, and safety factor. This research was first measureing the dimensions of a MUSTANG bike frame. Next, it was drawn, and simulated using Autodesk Inventor Professional 2015 software. Simulation results were then used to optimize the frame design in terms of its mass, stress, strain, displacement and safety factor. The optimized design simulation shows that maximum stress and displacement being 14,75 MPa and 0,01617 mm, respectively. In addition, minimum safety factor and mass being 14,94 and 3,1323 kg, respectively. The optimum bike frame was found at modification frame 5 with maximum stress of 8,40 MPa, maximum displacement of 0,01782 mm, minimum safety factor of 15 and minimum mass of 3,1343 kg. 
Rancang Bangun Robot Amphibi Sebagai Sistem Monitoring Gorong-Gorong Mustar, Muhamad Yusvin; Nugraha, Aditiyo Eka; Hidayat, Ahmad Imam; Zidni, Hasan; Oktaviani, Rara Dwi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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This research proposes a design and implementation of a culvert monitoring system, based on amphibious robots that resemble ship shapes. This robot, enable to work on land or on the surface of water. A robot control algorithm, based on Arduino microcontroller programming designed and modeled as human and robot interaction, so users can interact directly with the robot in movement control. The outputs generated on this monitoring system are images and sound. Images and sounds obtained from Mobius camera installed on the robot. The results of monitoring and control of robots is controlled wirelessly, so it can perform robot control and monitoring of long-distance culvert and different places. The system proposed in this study can be implemented and applied in real terms, as a system that can help and facilitate the monitoring of water tunnel
Pembuatan Alat Incinerator Limbah Padat Medis Skala Kecil Sukamta, Sukamta; Winata, Andri; Thoharuddin, Thoharuddin
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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Trash is one of the major problems in big cities. Trash has negative impact on the environment, because waste can cause environmental pollution, as well as hygiene and health problems. For processing the solid medical waste, it must be combusted at temperatures higher than 800 °C to reduce combustible garbage that can no longer be recycled, and toxic chemicals, to kill bacteria and virus. In energy efficient perspective, to overcome this, an incinerator has been developed. The main incenartor frame is made of iron elbow. The iron elbow is cut using an appropriate machine depending on the dimension of the design, and they are assembled by welding process. The furthure step is to complete by manufacturing of the chamber, and chimneys. The wall of he incinerator machine is made of red bricks, and glass woll for insulators. To measure and control the temperature, thermocuple and thermocontrol being put on the inner wall of the incinerator machine are used. The function of the incinerator machine was tested, and it wotked well. Commisioning test of the machine for solid medical waste i.e. infusion bottles, spets, glass bottles, baby pempers and expired medicines were conducted. It shows that the acheived temperature is of 998⁰C during 25 minutes of the opearation and all of the solid waste have become ash except needle, plastic and glass. So, this machine can be operated as a small scale solid medical waste processing equipment.
Efek Variasi Beban Pendinginan Terhadap Coefficient Of Performance (Cop) Alat Uji Pengukuran Koefisien Evaporasi Menggunakan Refrigeran R-134A Santosa, Tito Hadji Agung; Nadjib, Muhammad; Thoharuddin, Thoharuddin; Riza, Muhammad Akhid
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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Investigation of the cooling load effect toward Coefficient of Performance (COP) is important to conduct. The Coefficient of Performance (COP) is related with compressor work and refrigeration capacity in order to produce a refrigeration system which have a high COP. The high COP value can be reached with minimum compressor work, however it has a maximum refrigeration capacity. This research is to know the effect of cooling load variation toward the performance of experimental device of evaporation heat transfer measurement. By knowing the changing of performance toward cooling load variation, it can be useful in design of an effective and efficient air conditioning system.The method of coolecting data is by experimental method that is by varying water mass flowrate (cooling load) which is flowed to evaporator. An evaporator is soak in a 30 xm x 15 cm x 20 cm water box. Water flowrate can be varied and be masured by a water rotameter. Refrigerant is using Freon R-134a. Experiment is conducted with an evaporation heat transfer coefficient device. The device is a model of modified refrigeration system by adding instruments : an orifice, a test section, and an electric heater. Thermocouple and some pressure gauges is installed at some points which has been determined. Thermocouple and pressure gauges is used to collect temperature and pressure data. After conducting an experiment by evaporator cooling load variation, temperature and pressure data is got. Furthermore based on the temperature and pressure data, the enthalpy is got and can be used to counting the compressor power. Refrigeration capacity can be counted from total heat absorbed by evaporator from water and is divided refrigerant mass flowrate. In this research is got results that cooling load given in evaporator enfluences the COP of the experiment device. By increasing in cooling load at the determined variation, the Coefficient of Performance (COP) of the device is increase. In this research it get results increasing of COP at some refrigerant mass flowrate. The maximum result is get at minimum range inverter variation, that is 16 Hz (ṁr = 9,4 g/s - 10,26 g/s) and the maximum cooling load variation is 2 LPM with COP of 4,96. Whereas the minimum results is get at the maximum inverter range variation, that is 24 Hz (ṁr = 11,83 g/s - 12,25 g/s) and the minimum cooling load variation is 1 LPM with COP of 1,98. This research give some information, if a cooling load of an air conditioning room is chanhing, then it will change the parameter (temperature and pressure) and COP of the air conditioning system in a room.
Pengaruh Cuaca Terhadap Perilaku Pengendara Sepeda Motor di Daerah Istimewa Yogyakarta Ismaili, Abul Fida
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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Indonesia as a developing country has a considerable growth in motor vehicles. Unlike other countries, the growth of motor vehicles is quite large motorcycle. In the last few years, the study of the relationship between weather and transportation is mostly done in the region or country with four seasons different in climate condition or in developed countries with good public transport conditions. It is still few to do research in developing countries, with poor public transport conditions and other problems. Yogyakarta is a city with tropical climate that it only has two types of weather conditions, namely dry and rainy seasons, which the both  will affect motorcyclists in Yogyakarta becoming the majority. In this study,  the author used a qualitative and quantitative approach to find the impact of weather changes on motorcyclists travel behavior. From the results of the study, it was found that the number of motor users was reduced by more than 30% when the weather changed. Broadly speaking, there are three behaviors of motorcyclists when the weather changes namely, wait until the weather back to normal, cancel the trip and continue the journey however in the conditions due to some reasons.
Pengaruh Diameter Elemen Bara Api Terhadap Peningkatan Efisiensi Kompor LPG Fadelan, Fadelan; Sudarno, Sudarno
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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 The addition of embers is an effort to improve the efficiency of LPG stoves. Fire-embossed element of woven pattern is made of wire nikelin. The device when is burned with LPG cooker fire will incite to form a high-temperature fire, so as to burn the unperfectly burned fuel vapor around the wire. Previous research has shown that the element of fire can improve the efficiency of 8.32%. The efficiency test is done by boiling water test. The diameter of the embers element is varied, 20 mm, 30 mm, and 40 mm. The performance of the appliance is compared to the LPG stove without the use of embers. Temperature distribution at each treatment was also examined. It was found that the use of fire element with diameter of 0.20 mm resulted in the highest efficiency of 61.71%, with an increase of 8.32%. Temperature distribution test results show that the use of fire diameter element 0.20 mm produce the most optimal adult fire areas.

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