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All Journal Buletin Udayana Mengabdi Jurnal Ergonomi Indonesia (The Indonesian Journal of Ergonomic) INDONESIAN JOURNAL OF BIOMEDICAL SCIENCES Jurnal Energi Dan Manufaktur Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri International Journal of Engineering and Emerging Technology Advances in Tropical Biodiversity and Environmental Sciences Journal of a Sustainable Global South Jurnal Manajemen Widya Amerta Journal Physical Therapy UNISA
I Wayan Surata
Program Studi Teknik Mesin Universitas Udayana
Agriculture, Biological Sciences & Forestry Arts Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Veterinary

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PENGGUNAAN DINNER PLATE YANG ANTROPOMETRIS PADA AMERICAN SERVICE MENINGKATKAN KINERJA PELAYANAN MAHASISWA PRAKTEK DI RESTORAN SEKOLAH TINGGI PARIWISATA NUSA DUA BALI Ni Putu Ariesta Budiani; Nyoman Adiputra; I Wayan Surata
Jurnal Ergonomi Indonesia (The Indonesian Journal of Ergonomic) Vol 2 No 1 (2016): Volume 2 No 1 Juni 2016
Publisher : Program Studi Magister Ergonomi Fisiologi Kerja Pascasarjana Universitas Udayana Denpasar Bekerjasama dengan Perhimpunan Ergonomi Indonesia (PEI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JEI.2016.v02.i01.p05

Abstract

American-style service (American Service) priority to speed and accuracy amongwaitress while did the ministry. Therefore a waitress required to be able to carry a maximum of four plates at a time when doing service. The application of inappropriate tableware may associate with musculoskeletal complaints and fatigue, and affect the service performance in the restaurant. It is necessary for the application of ergonomic aspect especially appropriate equipment.This research was using an experimental study with the pre and post test control group design. This study involved fourth semester students, Restaurant Management Third Diploma of Nusa Dua Bali Tourism Institute as a subject as many as 36 people. The result showed significantly difference between control and treatment groups. In the treatment group  had  decreased  subjective  complaints  that include  musculoskeletal disorders about 38.7 % and general fatigue about 42.9 %. The length of presentation time decline 36.86%, while the quality of the presentation increased 65.01%. The decrease insubjective complaints occurred because the application of anthropometric dinner plate thatlighter 410 grams and has a shorter diameter 4.2 cm than previous plate. It is more convenient to carry even four at the time when presents to the guests. This is also showed an increase inservice performance. It can be concluded that the ergonomics  application  of using  appropriate anthropometric equipment in the American Service can improve the service performance among practice students in restaurant.
Pemurnian Biogas Dari Gas Pengotor Hidrogen Sulfida (H2S) Dengan Memanfaatkan Limbah Geram Besi Proses Pembubutan Komang Metty Trisna Negara; Tjokorda Gde Tirta Nindhia; I Made Sucipta; I Ketut Adi Atmika; Dewa Ngakan Ketut Putra Negara; I Wayan Surata; A.A.I.A. Sri Komaladewi
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

This research is intended to utilize waste steel chips from the process of turning (process in which lathemachine is used) for purification of biogas from the gas of hydrogen sulfide (H2S) contaminant to supportthe promotion of zero waste industrial and manufacturing process in the world. The waste of Iron chips iscollected and selected. Only long and spiral like of iron chips that are useful for this purpose. Since thechips having residual stress due to strain hardening during turning process, then the annealing processshould be done before compacting to form a billet.The thickness of the billet was 1 cm and 6 cm indiameter with weight 500 gram. The annealing proces was carried out by burning the iron chip until reachthe red color of fire. During the annealing process the iron inside the steel will react with oxygen to formiron oxide (Fe2O3) and if during oxidation there is a water vapor in the air then the iron bog ore Fe(OH)3 willbe formed. Both of Fe2O3 and Fe(OH)3 are very reactive to H2S and therefore able to eliminate the H2Scontaminant inside the Biogas. The billet is used as a filter and to be installed in the line of biogasdistribution. The result indicate that the the iron chips is potential to be utilized to reduce the H2Scontaminant in the biogas
Potensi bambu swat (gigantochloa verticillata) sebagai material karbon aktif untuk adsorbed natural gas (ANG) Dewa Ngakan Ketut Putra Negara; Tjokorda Gde Tirta Nindhia; I Wayan Surata; Made Sucipta
Jurnal Energi Dan Manufaktur Vol 9 No 2 (2016): Oktober 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Bambu merupakan material biomassa yang banyak diteliti, diproduksi sebagai karbon aktif dan diaplikasikan di berbagaibidang kehidupan. Namun sangat sedikit bahkan hampir tidak ditemukan referensi yang membahas kegunaan karbonaktif dari bambusebagai adsorbent untuk Adsorbed Natural Gas (ANG). Penelitian ini difokuskan untukmengkarakterisasai dan menevaluasi potensi bambu swat (Gigantochloa verticillata) sebagai material dasar karbon aktifuntuk aplikasi ANG. Pengujian yang dilakukan meliputi uji proximate, uji ultimate, uji komposisi kimia dan pengamatanstruktur mikro. Hasil penelitian menunjukkan bahwa bambuswat memiliki kandungan lignin 22,9920%, selulosa44,2247%, volatile 88’32%, carbon 43,42%,ash 1,83%, silica (1,8664%) dan nitrogen 1,7065%. Bambu swat memilikiikatan pembuluh yang terdiri atas satu ikatan pembuluh (xilem dan floem) dan dua ikatan serat yang terletak di sebelahdalam dan luar dari ikatan pembuluh.Secara umum dapat dikatakan bahwa bamboo jenis ini memiliki kandungansellulosa, volatile dan karbon yang cukup tinggi serta ash, silica, hydrogen dan nitrogen yang rendah sehinggabambuswat sangat berpotensi digunakan sebagai material sumber karbon aktif.Kata kunci: Karbon aktif, bambu swat, ANG, lignin, sellulosa, analisa ultimate dan proximatesAbstract:Bamboo is a biomass material widely researched, produced as activated carbon and applied in various life fields.However, very little or almost no references were found with regard to utilization of bamboo activated carbon asadsorbent for Adsorbed Natural Gas (ANG). This study is concerned to characterize and evaluate potency of bambooswat (Gigantochloa verticillata) as aprecursor of activated carbon for ANG application. Examinations conducted wereproximate, ultimate, chemical composisition tests and microstructure observation. The results showed that bambooswathave a lignin content 22.9920%, cellulose 44.2247%, volatile 88.32%, carbon 43.42%, ash 1.83%, silica 1.8664% andnitrogen 1.7065%. The type of bamboo swat vascular bundles consist of a single bond vessels (xylem and phloem) andtwo ligament fibers are located on the inside and outside of the vascular bundles.Generally, it can be said this type ofbamboo has high contents of cellulose, volatile and carbon and low contens of ash, silica and nitrogen so that it hasgreat potential as a source of activated carbon..Keywords: Activated carbon, bamboo swat, ANG, lignin, cellulosa, ultimate and proximate analysis
Pelapisan perunggu dengan krom untuk meningkatkan kekerasan permukaan I Wayan Surata
Jurnal Energi Dan Manufaktur Vol 1, No 1 Juni 2006
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Alloys containing principally copper and tin are considered as bronzes. These materials possess desirable properties of strength, wear resistance, and salt water corrosion. Bronzes materials are widely used such as for gears, bearings and other machine parts. These component parts work with relative movement, pressure, and friction on the contact surfaces, for long time will cause surface wear. To improve wear resistance and hardness of the contact surfaces, it needed to be plating by an electroplating method. This study is to find out the influence of plating thickness to the hardness on electroplating bronzes by chromium. The specimen is hollow cylindrical form of bronze with inner diameter 10 mm, outer diameter 30 mm and height 10 mm. Treatment variables are plating time, with variation of 30, 50, 70, 90, and 110 minutes. The dependent variable in this study is surface hardness. Specimens are made 3 items for each observation, so the total specimens are 15 items. The electrolyte used in this study is mixed of CrO3 (250 g/L), and H2SO4 (2.5 g/L), meanwhile electric current 50 Amperes and voltage 6 volts keep constantly during the process. The result can be concluded that there is a positive linear correlation between plating time with plating thickness, and plating thickness with surface hardness.
Komposit poliester/serat gelas: pengaruh jumlah lapisan serat terhadap sifat mekaniknya NPG Suardana; IW Surata
Jurnal Energi Dan Manufaktur Vol 2, No.1 Juni 2007
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Technology of polymers and composites progressively expand which had been found of various new composite types with excellence and also it’s excess. Currently, one of the composite materials was used in many industrial of automotive as vehicle body especially for components that needed light material with high strength and high corrosive resistance is Glass Fiber Reinforced Polymer (GFRP). This research investigated whether the addition of fiber layer can increase flexural strength of the composite, and how many the maximum fiber layer or maximum fiber fraction of weight. The experiment used unsaturated polyester Resin type of Yukalac 157 BQTN-EX as matrix, short glass fiber sheet with random orientation (chopped random mat) type of MAT 300 as reinforcement, and methyl etil keton peroxide (MEKPO) as hardener, respectively. The specimens were made by press hand lay-up and then formed and underwent the flexural testing according to standard of ASTM D 790 - 03. From the result and data analysis, it can be concluded that the weight fraction and fiber volume fraction increased with fiber layer. These resulted in the increase of flexural modulus and strength of GFRP. The specific strength and specific flexural modulus had relatively constant value, because the increase of flexural strength will be followed by increased its density. The number of maximum fiber layer in 1 mmcomposite in thickness was 3 layers (MAT 300), which approached the maximum fiber fraction of weight (Wf = 58.69%, 60% maximum).
Studi sifat mekanis komposit epoxy berpenguat serat sisal orientasi acak yang dicetak dengan teknik hand-lay up I Wayan Surata; I Putu Lokantara; Ade Putra Arimbawa
Jurnal Energi Dan Manufaktur Vol 9 No 2 (2016): Oktober 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Tanaman sisal tumbuh liar di daerah kering berbatuan seperti di pulau Nusa Penida kabupaten Klungkung, yang oleh penduduklokal disebut tanaman bagu. Serat sisal sangat kuat oleh karena itu dahulu banyak digunakan sebagai tali-temali penambatjukung atau perahu, sebelum dikenalnya tali nilon seperti saat ini. Belakangan ini serat alam termasuk sisal banyakdikembangkan sebagai penyusun komposit. Komposit serat sisal dapat dibudidayakan dengan mudah dan murah sehinggaketersediaannya bisa berkelanjutan, serta ramah terhadap lingkungan. Kekuatan mekanis komposit yang diperkuat denganserat alam dapat ditingkatkan dengan mengatur perbandingan fraksi volume serat di dalam komposit tersebut. Tujuanpenelitian ini adalah menyelidiki pengaruh fraksi volume serat terhadap sifat tarik dan lentur komposit berpenguat serat sisaldengan matriks epoxy. Serat sisal diperoleh dengan cara ekstraksi yaitu perendaman dan penyisiran, kemudian dipotongdengan ukuran panjang 3 cm. Serat sisal mengalami perlakuan dalam larutan alkali 5% NaOH selama 2 jam. Matriks yangdigunakan adalah epoxy resin, dengan hardener versamid. Komposit dibuat dengan teknik press hand lay-up, dengan variasifraksi volume serat sisal 15%, 20%, dan 25% yang disusun secara acak. Komposit hasil cetakan mengalami post curing padasuhu 65 oC selama 2 jam. Spesimen uji tarik dibuat berdasarkan standar ASTM D3039, dan uji lentur mengacu pada standarASTM D790M. Pengujian tarik dilakukan dengan mesin uji tarik universal, dan pengujian lentur dengan metode tiga titikpembebanan. Hasil penelitian menunjukkan bahwa kekuatan tarik dan modulus elastisitas tarik komposit meningkat seiringdengan meningkatnya fraksi volume serat, dan nilai optimum terjadi pada fraksi volume serat 25%, yaitu 19,77 MPa untukkekuatan tarik, dan 2,83 GPa untuk modulus elastisitas, sementara regangan tarik optimum terjadi pada fraksi volume serat15%, yaitu sebesar 1,01%. Kekuatan lentur dan modulus lentur serta regangan lentur juga meningkat seiring denganmeningkatnya fraksi volume serat, dan nilai optimum dicapai pada komposit dengan fraksi volume serat 25%, yaitu 88,48 MPa,untuk kekuatan lentur, dan 0,259 GPa untuk modulus elastisitas lentur, serta regangan lentur sebesar 7,55%.Kata kunci: Serat sisal, komposit epoxy, fraksi volume, kekuatan tarik, kekuatan lenturAbstract:The sisal plant (Agave sisalana) grows wild in arid areas such as the rocky island of Nusa Penida in Klungkung regency, andlocal people call bagu plants. Sisal fiber is very strong that is why it widely used as rigging on boats or ships, before they knownylon rope. Currently, natural fibers including sisal has been developed as elements to produce composites. Sisal fibers can becultivated easily and inexpensively so that availability will be sustainable and environmentally friendly. Mechanical strength ofcomposites that reinforced with natural fibers can be improved by setting the ratio of fibers volume fraction in the composite.The aim of this study was to investigate the effect of fiber volume fraction on tensile and flexural properties of composite withsisal fiber and epoxy matrix. Sisal fibers obtained with extraction process by soaking and combing, then cut to a length of 3 cm.Sisal fibers undergo treatment in an alkaline solution of 5% NaOH for 2 hours. The matrix used is epoxy resin, with a hardenerversamid. Composites was made by hand lay-up technique, with a variation of fibers volume fraction of 15%, 20%, and 25%which were arranged randomly. Composite underwent post curing at a temperature of 65 ° C for 2 hours. Tensile testspecimens were made based on the standard ASTM D3039, and the flexural test based on ASTM standards D790M. Tensiletest was conducted by using universal tensile testing machine, and flexural test with a three-point loading method. The resultsshowed that the tensile strength and tensile modulus of elasticity of the composite increases with increasing fibers volumefraction, and the optimum value occured in the fibers volume fraction of 25%, the highest value of 19.77 MPa for tensilestrength, and 2.83 GPa for the modulus of elasticity, while the strain optimum occured on the fibers volume fraction of 15%, withvalue 1.01%. Flexural strength, flexural modulus and flexural strain also increases with increasing fiber volume fraction, and theoptimum value was achieved in the composite with a fiber volume fraction of 25%, with value of 88.48 MPa for flexural strength,flexural modulus of 0.259 GPa and flexural strain of 7.55%.Keywords: Sisal fiber, epoxy composites, volume fraction, tensile strength, flexural strength
Pengaruh Lamanya Waktu Penyimpanan Biogas Terhadap Komposisi Biogas I Wayan Putra Adanyana; Tjok Gde Tirta Nindha; I Wayan Surata
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 6 No 1 (2020)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2020.v06.i01.p09

Abstract

Biogas merupakan gas yang di hasilkan dari limbah organik yang dapat di perbaharui dan dapat di jadikan bioergi, komposisi yang terkandung dalam biogas yaitu gas hydrogen sulfida (H2S), gas karbon dioksida (CO2), oksigen (O2), H2O dan gas metana (CH4). Lamanya waktu penyimpanan biogas yaitu untuk mengetahui pengaruh komposisi biogas selama penyimpanan. Kapasitas bag yang di gunakan dalam penelitian ini berkapasitas 100 lt biogas disimpan selama 21 hari , komposisinya di uji setiap hari sampai hari ke 7 dan kembali di uji komposisinya di hari ke 21 dengan aliran biogas 3 liter per menit. Perbandingan data dalam penelitian ini biogas di simpan dalam 2 bag, bag 1 tersimpan biogas belum di murnikan , bag ke 2 tersimpan biogas yang belum di murnikan dan di tambahkan kalsium klorida (CaCl2) di dalam bag. Hasil dari penelitian ini menunjukkan peningkatan komposisi CH4 sebesar 62 % dengan penambahan CaCl2 dalam bag ke 2 dan menurunnya komposisi H2S dsan CO2 dibandingkan biogas yang tersimpan di bag 1 komposisi CH4 hanya 47 %. Biogas is a gas produced from organic waste that can be renewed and can be made into bioergy, the composition contained in biogas is hydrogen sulfide gas (H2S), carbon dioxide gas (CO2), oxygen gas (O2), H2O and methane gas (CH4). The length of time for biogas storage is to determine the effect of biogas composition during storage. The capacity of the bag used in this study with a capacity of 100 liters of biogas is stored for 21 days, the composition is tested every day until the 7th day and the composition is tested again on the 21st day with a biogas flow of 3 liters per minute. Comparison of data in this study biogas stored in 2 bags, bag 1 stored biogas not purified, bag 2 stored biogas that has not been purified and added calcium chloride (CaCl2) in the bag. The results of this study showed an increase in the composition of CH4 by 62% with the addition of CaCl2 in bag 2 and a decrease in the composition of H2S and CO2 compared to biogas stored in bag 1 in the composition of CH4 was only 47%.
Analysis of Musculoskeletal Disorders (MSDs) of Pharmaceutical Workers Ade Sri Mariawati; I Putu Gede Adiatmika; Nyoman Adiputra; I Wayan Surata
Journal of A Sustainable Global South Vol 5 No 2 (2021): August 2021
Publisher : Institute for Research and Community Services Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jsgs.2021.v05.i02.p01

Abstract

Pharmaceutical work activities have a high repetition level with a work attitude of standing for 8 hours potentially causing musculoskeletal complaints, which can occur despite the normal work posture. This study aims to determine musculoskeletal disorders (MSDs) and the level of MSDs based on what categories are felt, the level of complaints, the level of frequency, and the severity. The research design using the questionnaire Nordic Body Map. The study was conducted in 17 pharmacies on 54 pharmaceutical workers. The results obtained by MSDs complaints based on what categories of pain statements obtained (43.2%), cramps (16.13%), aches (53.5%). The category of complaint level obtained statement rather sick (55.9%), sick (33.5%). The category of frequency level obtained by the statement that occurs 1 to 2 times per week (56.5%), and every day (10.6%). And the severity category states that the perceived complaint is still working (49.06%) and uncomfortable (47.1%). Index Terms— Muscle Fatigue, MSDs, Nordic Body Map, Pharmacist Assistant
Surface Modification of Microfiltration Polypropylene Membrane for Molecular Air Filtration A.A.I.A.S Komaladewi; PTP Aryanti; I D G Ary Subagia; I W Surata; I G Wenten
International Journal of Engineering and Emerging Technology Vol 4 No 1 (2019): January - June
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

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Abstract

Microfiltration polypropylene (MPP) membrane has increasingly been used in separation processes due to its good chemical and mechanical stability, high selectivity to submicron particles, and low cost. In this paper, the MPP membrane was modified by coating the surface with a composite polysulfone (PSf)/PEG400/ZnO layer. Then, the modified MPP membrane was used for fine particle removal from air. Performance of modified MPP membrane as a function of polymer and ZnO nanoparticles (ZnO-NPs) concentration in coating solution, and coating time, was investigated. The SEM image showed that the presence of ZnO-NPs in polymer solution generated macrovoids in the coating layer. Permeate flux decreased with increasing polymer and ZnO-NPs concentration, but the flux increased with increasing coating time. Meanwhile, fine particle removal efficiency increased with the increase of operating pressure. A stable air flux of 19 L m-2 h-1 was obtained at ZnO-NPs concentration of 3 wt.%. The removal efficiency of PM1, PM2.5, and PM10 at operating pressure of 2 bar were 70%, 74%, and 70%, respectively.
EFFECT OF ALKALI TREATMENT ON THE TENSILE STRENGTH OF LIDAH MERTUA FIBER/ POLYPROPYLENE RECYCLED BIOCOMPOSITE I Putu Lokantara; NPG Suardana; IW Surata; INS Winaya
International Journal of Engineering and Emerging Technology Vol 4 No 2 (2019): July - December
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2019.v04.i02.p09

Abstract

The purpose of this study was to determine the effect of alkali fiber treatment on the tensile strength of composites. The material in this study was recycled polypropylene from plastic beverage glass and lidah mertua fiber with a fiber length of 180 mm, fiber treatment using 5% NaOH and without treatment. Composite specimens were prepared using the hot press method at 170oC for 120 minutes. Tensile testing with the dimensions of the test specimen refers to ASTM D-638. The results of the test carried out the maximum tensile strength value of 71,606 MPa in fiber with 5% alkali treatment. The tensile strength of composites with alkali treatment increased 223% compared to the tensile strength without alkali
Co-Authors A. Manuaba Ade Putra Arimbawa Ade Sri Mariawati Anak Agung Istri Agung Sri Komaladewi Astawa, I Wayan D. N. K. P. Negara D.P. Sutjana Dewa Ngakan Ketut Putra Negara I Dewa Putu Sutjana I G Wenten I Gusti Agung Kade Suriadi I Ketut Adi Atmika I MADE MULIARTA . I Nengah Suarnadwipa I Nyoman Adi Putra I Nyoman Suprapta Winaya I Nyoman Sutantra I Putu Gede Adiatmika I Wayan Putra Adanyana I. K. A. Atmika I.B.P Adnyana I.D.G.P. Swastika I.D.N.P. Swastika I.K.A Atmika I.P.A. Astawa Indrasuari, A.A Istri Diah Ketut Tirtayasa Komang Metty Trisna Negara Luh Made Indah Sri Handari Adiputra Luh Putu Ratna Sundari M Sucipta Made Sucipta N. Adiputra Ni Luh Made Reny Wahyu Sari Ni Putu Ariesta Budiani NPG Suardana Nyoman Adiputra Palilingan, Richard Andreas PTP Aryanti Putu Lokantara R. Antara Rina Mayangsari Siti Helmyati Swarmadika, Ida Bagus Alit Tjok Gde Tirta Nindha Tjokorda Gde Tirta Nindhia Tjokorda Sari Nindhia Tomáš Ruml Weda Subawa, I Gede Putu Y.P Sudarmojo Zdenek Knejzlík