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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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Simulasi Pengaruh Jumlah Lubang pada Ring Fiksasi Eksternal untuk Tulang Tibia Krisdiyanto, Krisdiyanto
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.212218

Abstract

External fixation is a device that is placed out of soft tissue. External fixation device is used to heal open fracture. Open fracture is fracture that soft tissue is broken. That device consist of pin, rod, and clamp. We should pay attention of external fixation stiffness. Number of rod can be increased to get this device more stabil. That device should be stabil so fracture position and pin track doesn’t move. External fixation that consist three rod usually   use rin. This research aims to get the effect of external fixation ring holes number to stiffness.
Penilaian Keselamatan Divisi Fuel Tank terhadap Perilaku Tidak Aman pada Pekerja Faradilla, Arnes; Awod, Usamah Makky; Safitri, Dian Mardi
Semesta Teknika Vol 23, No 2 (2020): NOVEMBER 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i2.9196

Abstract

PT Batarasura merupakan salah satu perusahaan manufaktur yang memproduksi Fuel Tank. Permasalahan yang dihadapi oleh perusahaan yaitu terjadi penurunan produktivitas kerja dan meningkatnya jumlah kecelakaan kerja. Tujuan dari penelitian ini adalah untuk menilai keselamatan di perusahaan dan mengetahui dimensi keselamatan yang paling berpengaruh terhadap tingginya angka kecelakaan kerja. Penelitian ini menggunakan kuisioner NOSACQ-50 untuk menilai iklim keselamatan dan metode Correspondence Analysis untuk menentukan dimensi iklim keselamatan yang berpengaruh terhadap kecelakaan kerja. Hasil penelitian menunjukkan bahwa dimensi iklim keselamatan yang paling berpengaruh yaitu tidak adanya pelatihan tentang bahaya kecelakaan kerja dan kurangnya komunikasi antar pekerja. Pekerja sering mengabaikan keselamatan kerja disebabkan oleh kurangnya pengetahuan tentang pentingnya menerapkan disiplin keselamatan kerja. Selain itu, perusahaan seharusnya memiliki komunikasi yang baik terhadap pekerja dan training yang tepat untuk meningkatkan motivasi pekerja dalam membangun sikap keselamatan kerja yang baik PT Batarasura is one of the factories that produce the Fuel tank. The problems of this factory are decreasing of productivity and increasing of the accident. The purpose of this research is to assess of safety in the factory and knowing of safety dimension which may influencing of high accident. This research uses the NOSACQ-50 questionnaire to assess the safety climate and Correspondence Analysis to determine which dimension that influencing the factory's accident. The result stated that the safety climate dimension, which acts as high as the factory's accident, is there is no learning and lousy communication. The worker often ignores safety because worker doesn't know about the importance of safety. On the other hand, the factory doesn't have any regulations when the worker is ignoring safety. So, the factory must have good communication and proper training, especially in security, to increase worker motivation to do the safety act.
Kinerja Boiler dengan Sistem Pembakaran Bersama antara Ampas Tebu dengan Sekam Padi dan Cangkang Kelapa Sawit Harnowo, Saptyaji; Yunaidi, Yunaidi
Semesta Teknika Vol 24, No 2 (2021): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i2.12937

Abstract

Operasional boiler di sebagian besar pabrik gula saat ini banyak yang mengalami kekurangan pasokan bahan bakar ampas tebu karena penurunan kapasitas giling. Kondisi ini menimbulkan masalah terhadap kontinuitas pasokan energi uap dan listrik di pabrik gula, sehingga untuk mengatasi masalah tersebut banyak dilakukan dengan penambahan bahan bakar alternatif dengan model pembakaran bersama (co-firing). Penelitian ini mencoba melakukan kajian model pembakaran bersama ampas tebu dengan sekam padi dan cangkang kelapa sawit berbasis persentase berat bahan bakar. Penelitian dilakukan berdasarkan data operasional boiler di pabrik gula Trangkil saat musim giling tahun 2020. Data yang dikumpulkan meliputi tekanan, kapasitas, dan temperatur uap, serta temperatur air masuk boiler dan temperatur gas buang. Analisis bahan bakar yang dilakukan adalah uji proksimat dan ultimat. Perhitungan dan simulasi pemakaian bahan bakar, kebutuhan volume furnace, efisiensi, dan rugi-rugi boiler dilakukan menggunakan bantuan analisis software Firecad WTPB. Hasil penelitian menunjukkan bahwa co-firing dapat menaikkan efisiensi boiler, menurunkan rugi-rugi boiler, menurunkan pemakaian bahan bakar dan kebutuhan volume furnace, serta menurunkan kecepatan gas buang di sekitar pipa-pipa uap utama. Mitigasi risiko harus dilakukan karena sistem ini dapat meningkatkan temperatur furnace, yang dapat meningkatkan potensi slagging dan fouling sehingga mengganggu kinerja boiler saat musim giling.
A New Formula For Rate Of Swelling Of Expansive Clay Soils Muntohar, Agus Setyo; Hashim, Roslan
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.v8i2.897

Abstract

The study of engineered expansive soils attracts the attention of researchers since this soil is mixed and increasingly used in many geotechnical and geoenvironmental application. This paper attempts to the study of swelling properties i.e. swell and swelling pressure, rate of swell, and water adsorption during swell. The kaolin-bentonite mix and sand-bentonite mix specimens are statically compacted and tested in conventional oedometer apparatus for swelling determination. The results of the study show that the mechanism of swell follows three distinct stages: intervoid, primary, and secondary swelling. The swell occurs since the soils adsorb water during water uptake. The rate of swell and maximum swelling are successfully determined using hyperbolic equation.
Pengaruh Cuaca Terhadap Perilaku Pengendara Sepeda Motor di Daerah Istimewa Yogyakarta Ismaili, Abul Fida
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i2.3099

Abstract

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.
Peranan Teknologi Solar Cell dalam Peningkatan Daya Saing Usaha Kecil dan Menengah Iswanto, Rif’an Tsaqif As Sadad ,
Semesta Teknika Vol 14, No 1 (2011): MEI 2011
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v14i1.585

Abstract

Rolling blackouts or blackouts caused by technical errors making people uncomfortable, one of those affected are Micro, Small and Medium Enterprises (MSMEs), due to power outages in various regions in Indonesia made a number of MSMEs to be losers. In addition to the problems faced by MSMEs is the occurrence of the peak load at night cause they can not work in the evenings (overtime). For that alternative energy is necessary for the SMEs in order to work, when electricity from PLN is susceptible to interference (fault) or in the repair process. With the considerations above, this study attempted to apply the technology Solarcell Home System (SHS) to be implemented as an energy reserve and secondary in the industrial sector, particularly in the MSMEs. The results showed that the use of technology can enhance business transformation solarcell through speed, and accuracy in producing goods. The SME entrepreneurs can increase production by using solarcell home system.
Kajian Angkutan Sedimen Di Sungai Pabelan, Kabupaten Magelang, Jawa Tengah Fauziyah, Risky; Kironoto, Bambang Agus; Legono, Djoko
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.211210

Abstract

Pabelan River is one of the rivers in the western slopes of mount Merapi located in Magelang Regency, Central Java province. Pabelan River has watersheds ± 84,70 km2 with the main river length ± 28,40 km2. The purpose of this research was to estimate the amount of sediment transport that occurred at the point of view in the Pabelan River and to know estimate of sediment balance that occurred at the point of view in the Pabelan River. This research was conducted to find out the sediment balance in the Pabelan River whether going on degradation, aggradation, or experience the equilibrium transport. Calculation of sediment balances based on the volume of sediment transport entering at the location selected. Based on the results of sediment transport analysis using MPM, EINSTEIN, DU BOYS and ROTTNER formula, the largest sediment transport volume occurred in PA-C 5 = 4850,592 m3/m/flood, 305,8398 m3/m/flood,  20321,979  m3/m/flood  and 80274,221 m3/m/flood, while the result of calculation based on formula FRIJLINK largest sediment transport volume occurred at PA-C 3 = 3654,817 m3/m/flood. To obtain the result of equilibrium sediment that occurred in the river of research  is by using the five formula  with the condition of the river that occurred aggradation and  degradation with the biggest condition is the result of calculation with the formula ROTTNER for aggradation occurs in PA-C X Prumpung  amount of 47272,806 m3/m/s with increase river bed amount of 13,504 m and degradation occurred at PA-C 5   -47468,692 m3/m/s with decrease at river bed -23,698 m.
Pemanfaatan Fly Ash dan Alkali Resistant Glass Fibre (ARG) dalam Pembuatan Paving Block Soebandono, Bagus
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v16i2.4919

Abstract

The paving block is an alternative to the use of pavement layer that is safe, strong and easy to installation and maintenance. Pavement paving block also can be produced both mechanically and manually. The added fly ash was a waste material from coal combustion in the steam power plant furnace in the form of fine, round, pozzolanic and fibre-resistant. Alkali Resistant Glass Fibre (ARG) which is shaped like a rope 18-36 mm long was added into the paving block with mixed compositions 1 Pc:10 Ps that aims to strengthen the compressive strength and flexibility of the paving block. This research was used 15 samples with mixture variation of fly ash 19% and fiber 0,25%, 0,5%, 0,75% and 1%. Based on the results of laboratory analysis, paving block (1 Pc: 10 Ps) with the addition of fly ash 19% and ARG 0.6% yielding a maximum compressive strength of 18.35 MPa. The addition of fibres with fly ash mixture was also able to increase the compressive strength of the paving block.
Evaluasi Sifat Mekanik dan Hidraulik Beton Porous Menggunakan Bahan Tambah Abu Batu Agung Setiawan; Mochamad Teguh
Semesta Teknika Vol 24, No 2 (2021): NOVEMBER 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i2.13165

Abstract

Penggunaan beton konvensional sebagai lapis permukaan bersifat kedap, berdampak potensi genangan air dan banjir. Salah satu upaya mereduksi limpasan permukaan dan meningkatkan resapan air hujan dengan menggunakan beton porous. Penelitian bertujuan mengkaji dan evaluasi  kinerja sifat mekanik dan hidraulik beton porous dengan bahan tambah abu batu sisa penggergajian kerajinan batu Gunung Merapi. Dalam penelitian percobaan laboratorium ini digunakan 4 (empat) variasi komposisi campuran semen, abu batu, agregat, dan faktor air semen sebagai berikut: 1:1:5, 1:1:6, 1:1:7 dan 1:1:8 serta faktor air semen 0,4. Pengujian benda uji mengikuti standar dan prosedur ACI 522R-10. Hasil penelitian menunjukkan beton porous dengan ukuran agregat 1-2 cm dan abu batu meningkatkan kuat tekan tetapi daya lolos air menurun. Kuat tekan beton porous tertinggi menggunakan ukuran agregat kecil (1-2 cm) dengan abu batu 7,47 MPa. dengan infiltrasi 0,28 cm/s dan permeabilitas 2,81 cm/s. Peningkatan kuat tekan menggunakan abu batu ukuran agregat 1-2 cm sebesar 40,83 % dan ukuran agregat 2-3 cm sebesar 62,30%.
Studi Pemanfaatan Prekursor Fly Ash Lokal pada Self Compacting Geopolymer Concrete (SCGC) Evelyn Anabela Anisa; Rahmad Afriansya; Julian Randisyah; Pinta Astuti
Semesta Teknika Vol 24, No 2 (2021): NOVEMBER 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i2.13075

Abstract

Beton merupakan suatu material yang banyak digunakan dalam dunia konstruksi. Namun, setiap produksi beton menimbulkan dampak buruk pada pemanasan global. Semen sebagai bahan pengikat beton dapat menyumbang emisi CO2 sebanyak 8% dalam setiap produksinya. Proses pengecoran pada beton juga dapat menghasilkan polusi suara akibat penggunaan alat vibrator. Para peneliti terus berupaya menghasilkan beton yang lebih ramah lingkungan. Self Compacting Geopolymer Concrete (SCGC) merupakan kombinasi baru antara beton geopolimer dan Self Compacting Concrete (SCC) yang masih terus diteliti dan dikembangkan hingga saat ini. SCGC merupakan beton ramah lingkungan karena tidak menggunakan semen portland sebagai bahan pengikatnya. Penggunaan beton SCGC tidak memerlukan vibrator karena memiliki sifat flowability yang baik. Penelitian ini menggunakan bahan pengikat berupa material pozzolan yang mengandung senyawa kimia berupa SiO2 dan Al2O3. Tahapan penelitian ini dilakukan dengan mencari metode curing dan mix design optimal dalam penyusunan SCGC. Pengujian XRF perlu dilakukan dalam penelitian ini untuk mengetahui kandungan senyawa kimia pada fly ash Tjiwi Kimia. Beberapa pengujian beton segar SCGC diperoleh hasil berupa slump flow 690 mm, T50 2,4 detik, v-funnel 8,35 mm, dan rasio l-box 0,84. Sifat mekanik beton diuji berdasarkan kuat tekan, kuat tarik belah, dan kuat lentur dengan hasil rata-rata sebesar 27,05 MPa, 6,32 MPa, 1,91 MPa.

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