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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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Prototipe Kotak Pengingat Minum Obat Irjayanto, Sulis; Chamim, Anna Nur Nazillah
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Abstract

Patient adherence to long-term therapy of chronic diseases in developing countries less than 50%, including in Indonesia. Patient compliance is required to achieve therapeutic success, especially in the treatment of non-infectious diseases. Such as diabetes, hypertension, asthma, cancer, mental disorders, infectious diseases HIV / AIDS, and tuberculosis. One factor led patience to the non-compliance is their busyness, so they often forget to take medication. Prototype of medication reminder box is one of the solutions to remind patients to take medication on time. In previous researches, the medication reminder operated in android platform. But, gadgets equiped with android operating system are often in out of reach of many people in developing countries. So, in this study, the medication reminder box was built with alarm facility that can be regulated by the patient. This device is also used as a portable drugs storage, so that the patient can carry easily. This prototype of medication reminder box operates well as expected and supported with battery which its endurance is 24,7 hours.
Disain Dan Fabrikasi Mesin Sputtering Skala Laboratorium untuk Penumbuhan Film Tipis Muhammad, Bagja Restu; Nugroho, Aris Widyo
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Plasma sputtering is well known method for preparation of thin films on various substrates. This technique involves expelling material from a target onto substrate in a vacuum chamber. Generally, the technique is equipped with argon supply system for ionized gas bombardments of the target. This work shows designing and fabricating process of a simple sputtering machine without gas supply system and its preliminary thin film preparation test. A CAD software was applied to design its main apparatus namely a vacuum system and an electrical system. Afterward, those apparatus were fabricated and assembled. Preliminary test was conducted using a cooper plate as a target and plate glasses as substrates for 90 s and 130 s processing time. The vacuum pressure, voltage and the electric current were set up at 10-2 torr, 150 volt and 1 A, respectively. The thin film on the glass was visually examined and  its resistivity was measured using ohm meter. The results show that a cooper thin film has been coated on the glass with the resistivity of 12.6 and 9 Ω. At this stage , it is confirmed that the plasma sputtering machine being fabricated has successfully worked.
Karakteristik Fisik Bahan Bakar Alternatif Campuran Minyak Jarak (CJO)-Minyak Cengkeh gamayel, adhes
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
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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.
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.
Karakterisasi Kekuatan Tarik Komposit Hybrid Lamina Serat Anyam Sisal dan Gelas Diperkuat Polyester Yudhanto, Ferriawan; Sudarisman, Sudarisman; Ridlwan, M.
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
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Hybrid fiber composite is a combination of two or more types of fiber that can be based on the architecture or type of the reinforcement. In this study, smoothly spun agave sisalana and cotton yarn were woven to produce sisal-cotton hybrid fabric . The sisal-cotton hybrid fabric (S) was combined with woven glass fabric (FG) to produce hybrid fiber reinforcing system.  Four variations of hybrid fiber reinforcement, i.e. three layers of woven glass fabric (FG-FG-FG), glass-sisal-glass fabrics (FG-S-FG), sisal-glass-sisal fabrics     (S-FG-S), and three layers of woven sisal-cotton fabric (S-S-S), each embedded in polyester resin were fabricated using cold press mold method. It was expected that the hybrid fiber composite exhibited new properties derived from both types of fiber so that the advantages of each fiber type would appear on the mechanical properties of the hybrid composite systems.  The properties being evaluted were tensile properties and density. The results showed that the highest tensile strength of the hybrid systems (FG-S-FG: 117 MPa) is a combination of those of both types of reinforcement, tend to obey the rule of mixtures, i.e. higher than that of natural fiber composite (S-S-S: 48 MPa) but lower than that of glass fiber composite (FG-FG-FG: 133 MPa). Tensile strain-to-failure was noted being sharply increase from 0.33% for GFRP composit up to above 1.07% by replacing the middle layer of FG reinforcement with S reinforcement. Whilst the density of the S-FG-S hybrid system seems to obey the rule of mixtures, that of the FG-S-FG hybrid system was observed lower than expected. This may due to the resin requires longer time to wetthe fibers so that the air between fibers did not posses enought time to evacuate at the jell time being reached such that producing void leading to lowering the density. 
Perencanaan dan Simulasi Jaringan Small Cell Indoor Hotspots Studi Kasus di Gedung Vokasi Universitas Telkom Nugraha, Toha Ardi
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Poor signal in indoor celluler network is caused by attentuation of the building  partition. In indoor areas, signal from base station transmitter cannot received perfectly in the receiver part. Therefore, this study discusses about planning of Indoor Hotspot (InH) using Small Cells technology case studi in Vocational Building Telkom University. From the network simulation, the  transmit power of the entire antennas can cover each floor as well with received signal level greater than -80 dBm with SIR level has positive value above 0dB. The lowest floor, the average received signal power values is the best value compare with the others with  received power about -40 dBm using 6 InHs. SIR best quality on the first floor of the building with the average received signal quality value of about -50 dBm using 7 InHs.
Pengaruh Penggunaan Plastik Polyethylene (Pe) Dan High Density Polyethylene (Hdpe) Pada Campuran Lataston-Wc Terhadap Karakteristik Marshall Rahmawati, Anita
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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The increase in road traffic during the last two decades in combination with an insufficient degree of maintenance due to shortage in funds has caused an accelerated and continuous deterioration of the road network. To alleviate this process, several types of measures may be effective, e.g., securing funds for maintenance, improved roadway design, use of better quality of materials and the use of more effective construction methods. Aspalt can also be modified by adding different types of additive. One of these additives is the polymers such as Polyethylene (PE) and  High Density Polyethylene (HDPE).  The addition of polymers typically increases the stiffness of the aspalt  and improves its temperaturesusceptibility. Increased stiffness improves the rutting resistance of the mixture in hot climates and allows the use of relatively softer base aspalt, which in turn,provides better low temperature performance. This study was conducted to determine the effect of utilizing Polyethylene (PE) and High Density Polyethylene (HDPE) as a mixture of thin layer of asphalt concrete in wearing course (Lataston_WC) using Marshall design parameters. The parameters assessed are the stability, flow,  the percentage of air void in the mixture (VIM), the percentage of void in the mineral aggregate (VMA), the percentage of void filled with aspalt (VFA), and Marshall Quotient (MQ). Marshall samplers prepared with the PE and HDPE modified aspalt binder provide the specification limits. The percentage of  PE and HDPE as asphalt mixture is 0%, 2%, 4% and 6% by weight of the asphalt. The result of Marshall test showed that the value of stability, flow and VFA have tendencey to increase with incresing of percentage of PE and HDPE. But, the value of VIM, VMA and MQ have tendency to decrease with  incresing of percentage of PE and HDPE. It can be seen that effect of addition HDPE on aspalt mixture provide the value of Marshall characteriscs are better than aspalt mixture with PE
Pengaruh Penambahan Pecahan Kaca Sebagai Bahan Pengganti Agregat Halus dan Penambahan Fiber Optik Terhadap Kuat Tekan Beton Serat Ikhsan, Muhammad Nur; Prayuda, Hakas; Saleh, Fadillawaty
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
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Fibre concrete is an innovation of normal concrete to special concrete to be stronger withstands the tensile force. Fibre concrete consists of cement, water, fine aggregate, coarse aggregate and additional fibre materials. The addition of fibre is expected to reduce the segragation and prevent cracks of the concrete. In this research used additional glass fracture with variation of 15%, 20%, 25% to the weight of the fine aggregate as well as additional of optic fibre of 0,15% of the concrete’s weight. Their compressive strength was examined at the age of 28 days. The result is gained by adding 15% of glass fracture 24,94 MPa with modulus of elasticity 23471,8 MPa, addition of 20% gained the result of compressive strength by 25,48 MPa with modulus of elasticity 23724,5 MPa, meanwhile by adding glass fracture 25% gained the result of compressive strength 25,77 MPa with modulus of elasticity 23859,2 Mpa.
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. 
Perencanaan Struktur Beton Bertulang Tahan Gempa Berlantai 4 (Studi Kasus Gedung Baru Kampus I Universitas Teknologi Yogyakarta) Masagala, Algazt Arsyad
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
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The new building in campus one of Universitas Teknologi Yogyakarta which consists of four floors is analyzed by using Intermediate Moment Resisting Frame (IMRF) to be able to withstand gravity and seismic load. The planning of reinforced concrete structure in this building is aimed to 1) to calculate the gravity and seismic plan load that works for the new building in campus one of Universitas Teknologi Yogyakarta, 2) to find the dimension of beam and column that able to withstand the working seismic plan load, 3) to determine the formation of beam and column reinforcement from the analysis result by using Intermediate Moment Resisting Frame (IMRF). The building structure analysis is conducted using SAP 2000 V.11 program. The planning of reinforced concrete structure is assumed as Intermediate Moment Resisting Frame/Structure (IMRF). The planning of beam and column is conducted by using the dimension in the field. The reinforced planning is conducted base on the Assessment Regulation of Reinforced Concrete Structure for Infrastructure with SNI 03-2847-2002. The assessment of static equivalent seismic load is referred to Standards of Earthquake Resistance Planning for Buildings with SNI-03-1727-2002. Based on the analysis by using Intermediate Moment Resisting Frame (IMRF), the planning of reinforced concrete structure including dimension and reinforced formation of beam and column has fulfilled the requirements and save based on field assessment.   

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