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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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Analisis Perencanaan Ulang Alinyemen Horizontal dan Pelebaran Perkerasan Tikungan di Ruas Jalan Nasional Gumitir (STA 231+000 - STA 235+100) Utomo, Nugroho; Fatikasari, Aulia Dewi
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.18033

Abstract

Kematian dan kerusakan akibat kecelakaan jalan raya di tikungan lebih banyak dibandingkan jalan lurus. Tikungan tajam merupakan lokasi yang sangat rawan terjadi kecelakaan. Salah satu Jalan Nasional yang sering terjadi kecelakaan di bagian tikungan yaitu Jalan Raya Gumitir dengan tipe jalan 2/2 UD dengan lebar 6 meter. Menurut data kecelakaan lalu lintas pada tahun 2017-2020 terjadi 30 kejadian kecelakaan. Maka perlu adanya perencanaan ulang yang merujuk pada aspek keselamatan pengguna jalan pada bagian alinyemen Horizontal dan area tikungan yang membutuhkan pelebaran. Data yang dibutuhkan yaitu data geometri jalan eksisting dan peta topografi lalu dianalisis untuk perhitungan alinyemen Horizontal dan pelebaran jalan berdasarkan Tata Cara Perencanaan Geometrik Jalan Antar Kota Nomor 38/T/BM1997. Hasil analisis yaitu alinyemen horizontal sebanyak 23 tikungan dengan rincian 11 tikungan Spiral–Spiral(SS), 6 tikungan Full Circle(FC) dan 6 tikungan Spiral–Circle–Spiral(SCS) dan rata-rata pada setiap tikungan membutuhkan pelebaran sekitar 10 meter. 
Fabrication and Characterization of PVC-Based Nanofiber Membranes for Water Filtration Application Sosiati, Harini; Ramadhan, Fachri; Rahman, M. Budi Nur
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.18476

Abstract

Polyvinyl chloride (PVC) dissolved in N-dimethylacetamide (DMAC) and filled with polyvinyl pyrrolidone (PVP) has been studied for water treatment applications due to the material being hydrophobic, rigid, and biodegradable. However, it does not have antibacterial properties. The chitosan nanoparticles (CSNPs) as a natural antibacterial polymer are added into PEO/PVC blend to fabricate nanofiber membranes for well water filtration. We investigate the effects of adding PEO and CSNPs to PVC on the morphology, tensile properties, water contact angle, and water filtration efficiency of the nanofiber membranes. The PEO-PVC polymer solutions are dissolved in DMAC by varying concentrations of 0, 1, 2, 3, and 4% PEO (w/w), then fabricated to be the nanofiber membranes by the electrospinning technique. The PEO/PVC membrane’s contact angle decreases with the PEO concentration and by adding 1% CSNPs. This trend aligns with the average nanofiber diameter but is opposite to the tensile strength. The 1% CSNPs/4% PEO/PVC membrane has shown 78% and 92% efficiency in filtering Coliform and Colitinja bacteria in the well water, respectively.
Thermal Resistance of the Loop Heat Pipe Prototype in Steady State Conditions Haryanto, Dedy; Giarno, Giarno; Hatmoko, Sumantri; Pambudi, Yoyok Dwi Setyo; Kusuma, M. Hadi
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.18788

Abstract

The nuclear accident at the Fukushima Daiichi nuclear power plant in March 2011 in Japan caused a tsunami and submerged the emergency diesel generator resulting in a station blackout (SBO). Based on the accident, a study was conducted on the use of passive safety systems as a support for active safety systems in nuclear reactor cooling systems. The Loop Heat Pipe (LHP) prototype is a small-scale LHP research facility, one of which is used to determine the characteristics and heat transfer events in LHP. Calculations to determine the thermal resistance of the LHP prototype need to be carried out to determine its performance level. The research was carried out experimentally for data collection followed by calculations based on the data that had been obtained. The calculation results obtained that the lowest thermal resistance is 0.014 °C/w with a 100% filling ratio and an airflow velocity of 2.5 m/s, so the setting of filling ratio and airflow velocity produces the best LHP prototype performance. The higher the airspeed, the greater the heat released by the condenser resulting in the value of the thermal resistance of the LHP prototype getting smaller. Thus, the greater the airspeed, the lower the thermal resistance of the LHP prototype, this indicates that the performance of the LHP prototype is increasing.
Concentric Bracing Frame in Earthquake-Resistant High-Rise Buildings Alhussein, Mohammedalameen Ahmed Aldaw; Nugroho, Guntur; Wahiddin, Wahiddin; Nursetiawan, Nursetiawan
Semesta Teknika Vol 27, No 1 (2024): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v27i1.21864

Abstract

Indonesia has regular earthquakes; thus, constructions must be designed to SNI 1726:2019. Building height based on SNI 1726:2012 table 9 and article 7.2.5.4 maximums. The survey says response-based damage models can assess ground vibrations. The earthquake damage was assessed and compared to the moment-resisting frame after the structure was rehabilitated with concentric bracing. 1) This study analyzes lateral forces on each level for moment-resisting and concentric-braced frames. CBF, 2) assessing displacements at each level for moment-resisting and concentric braced frames, and 3) counting narratives. The ETABS Structural Analysis Professional 2020 program measures structural element internal forces. Internal forces include shear, axial, bending, and twisting. Next, calculate level displacement, or vertical distance between levels. The pushover analysis on medium and high-rise structures shows 0.91% CBF lateral shear force. CBF stiffens elastically. CBF supports enhance CBF displacement by 70%, minimize floor structure displacement, and stiffen the steel frame laterally more than MRF. Maximum CBF deviation between floors is 85%; CBF and MRF weight differential is 1.530%. Thus, the CBF exceeds the frame weight. The designed structure is important, but seismic performance in static and dynamic nonlinear circumstances differs.
Analysis of the Noise Level at the Muhammadiyah KH. Ahmad Dahlan S. Parman Complex, Banjarmasin Hardiani, Dyah Pradhitya; Ruhaidani, Emma
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.18664

Abstract

The traffic density in Banjarmasin will have an impact on the environment such as the noise which causes health problems to humans. The noise in the school area, it will damage for concentration of students, teaching and learning activities inefficient. The purpose of this study was to determine the noise level in the College Complex of Muhammadiyah K.H Ahmad Dahlan, Banjarmasin. Measurement is carried out at 4 points and used Sound Level Meter (SLM). Noise data processing is calculated by the equivalent noise level (Leq). The  results show that noise value exceeded the noise quality standard  according to the  Environmental Decree 1996 for noise levels in schools. The highest noise value reached 80.29 decibels while the lowest value was 63.04 decibels. Based on the results, it is necessary to reduce noise levels in this school area, so that teaching and learning activities can run properly.
Naive Bayes for Diabetes Prediction: Developing a Classification Model for Risk Identification in Specific Populations Arrayyan, Ahmad Zaki; Setiawan, Hendra; Putra, Karisma Trinanda
Semesta Teknika Vol 27, No 1 (2024): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v27i1.21008

Abstract

Depending on persuasive statistics, the increasing prevalence of diabetes worldwide is a huge challenge for individuals, families, and nations. According to International Diabetes Federation (IDF) projections, the number of adults with diabetes is expected to rise by an astounding 46% by 2045, to reach 783 million, or one in eight. In response to this growing concern, this research explores the implementation of the Naive Bayes algorithm for predicting diabetes, employing comprehensive data cleansing and randomization techniques. A systematic evaluation of the model's performance is conducted using several training and testing split ratios (65:35, 75:25, 85:15). The outcome showed that the model performed best at the 65:35 split ratio, with accuracy reaching its maximum of 88.16%, precision 0.883, recall 0.881, and f1-score 0.882.
Structure Design Evaluation of Muhammadiyah Banjarmasin University Convention Centre Building Due to Functional Change Based on SNI 03-2847-2019 Anggarini, Elia; Muzaidi, Irwandy
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.18659

Abstract

The Muhammadiyah Banjarmasin University Convention Centre Building was originally built as a guesthouse, over time it changed its function to become a place for lecture activities. Therefore, an evaluation of the initial structural design is carried out on the reliability of the building structure as regulated in Government Regulations in Permen PU No. 25 of 2007 concerning Certificate of Building Functioning or SLF. The data used in this study are primary and secondary data, where primary data is in the form of field tests to determine the uniformity of concrete quality, namely the bounce test using the Hammer Test tool on the beams and columns of the 1st floor and 2nd floor as many as 10 points, while secondary data uses preliminary planning data. Modeling is done in 3D using SAP2000 software. The results of research on the value of uniformity of concrete quality show mixed results, this is due to several factors, one of which is different casting methods in the field. Meanwhile, from the results of the analysis of the service ability of the building structure, the value of the Ultimate Moment (Mu) and Ultimate Load (Pu) as well as the Maximum Ultimate Moment (Mr) and Maximum Ultimate Load (Pr) is still able to withstand the loads acting on the structure even though it has changed its function based on SNI 03-2847-2019.
Structural Damages Identification and Maintenance Design of Sports Facilities for Improving Performance and Infrastructure Resilience Utari, Virda; Astuti, Pinta
Semesta Teknika Vol 27, No 1 (2024): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v27i1.21802

Abstract

Building maintenance is vital to ensure facility reliability, security, and investment value, as neglect can lead to structural decay and safety hazards. This study aims to assess the deterioration level of sports facilities at PT SIER and devise an efficient maintenance plan. The process involves identifying structural damages, evaluating deterioration following guidelines, and planning maintenance actions. Subsequent steps include budgeting, creating Work Plans and Specifications, estimating Domestic Component Levels, and scheduling using the S-Curve. Analysis reveals varying degrees of architectural degradation, ranging from 1 to 3, signifying serious damage. The estimated total cost for upkeep and development is Rp 255,718,000, with a projected minimum Duty and Customs Levies value of 30.43%. Maintenance duration is estimated at 45 days, managed using the S-Curve method. 
Experimental Study on the Performance of Mechanical Coupler Splice Made of Rebar Under Monotonic Loading Muhammad, Heidi; Saputra, Ashar; Triwiyono, Andreas
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.19263

Abstract

The lap splice method presents a drawback due to reinforcement congestion, affecting the pouring and evenness of the concrete. Additionally, lap splicing significantly contributes to construction waste. As a result, research was conducted on mechanical connections using reinforcements to reduce construction waste and demonstrate the feasibility of these splices. In this study, the threaded coupler with standard national coarse threads splice method was employed, and tests were conducted following ASTM A1034-10a standards with monotonic tensile loading. Test specimens were created using 13 and 16 mm reinforcement sizes, varying the length and diameter of the coupler, and including welding at the coupler ends. The test results demonstrated that reinforced bars with splices exhibit a stress-strain relationship similar to intact reinforcement. However, these reinforced bars with splices did not meet the requirements outlined in SNI 2052:2017 concerning maximum stress and strain, including their comparison. Therefore, the utilization of these splices is not suitable for critical load-bearing areas.
Evaluation and Strengthening Recommendations of Rectorate Building Muhammadiyah University of Sumatra Barat Due to Earthquake Habirun, Asiya Nurhasanah; Kurniawan, Deddy; Ad'ha, Muhammad Fajri
Semesta Teknika Vol 27, No 1 (2024): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v27i1.20088

Abstract

The UM Sumbar Rectorate building suffered structural damage after 33 years. During service life, earthquakes have frequently occurred, the largest was 7.6 magnitude earthquake 2009 in Padang. The structural components have never been handled. This study aims to identify the existing condition as a basis for handling structural damage. Research activities are structure inspection, structural analysis, and determining structural improvements. The building has been deflected by 1° (± 10cm). The majority of structural elements are cracked due to overcapacity. Based on ATC 40 pushover analysis results, it found that 10 steps on x-direction and 11 steps on y-direction of push loads on the structure until it collapsed. Structure performance level is Life Safety, which is in a plastic condition. Strengthening are suggested to increasing column, building ductility, and implementing a dilation system. Evaluation the foundation structure and soil investigation are necessary before planning the strengthening.

Page 69 of 72 | Total Record : 715

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