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CHANGING BODY POSTURE AND WORKING SYSTEM IMPROVES WOKERS PERFORMANCE AND PRODUCT QUALITY Surata, I Wayan; Manuaba, A.; Adiputra, N.; Sutjana, D.P.
INDONESIAN JOURNAL OF BIOMEDICAL SCIENCES Vol. 5, No. 1 Januari 2011
Publisher : Udayana University

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Seaweed is one of the nation’s potential marine commodities that maycontribute to the national revenue and a new source of income for the localcommunity, as the cultivation of seaweed is much easier and cheaper than paddycrop, because neither pesticides nor fertilizer would be required. Other advantages ofcultivating seaweed are the fact that it can be carried out throughout the year, and itsrelatively shorter duration to reach the harvesting time. Local practice of drying theseaweed is by spreading it over a plastic sheet on the ground and exposing it to thesun. Unfortunately, such traditional practice of drying seaweed has led to increasedrisk of contamination of seaweed by dust and sand particles and other impurities.The quality of seaweed is influenced by the type of seedlings, harvesting age, andthe crucial process of drying. The local traditional working posture during drying issquatting and stooping to flatten and spread evenly the seaweed. Our preliminarystudy has shown that the farmers have had considerable musculoskeletal complaintsand fatigue with the seaweed quality being still relatively low.This study was conducted to examine the effects of changing the workers’working posture and limiting lift weight at 23 kg and introduced a 5-minute breakafter an-hour work with the aim to improve both workers’ performance and seaweedquality and productivity. This is an experimental study using a two-period crossoverdesign on 20 farmers of seaweed cultivation in the Ped Village of Nusa Penida.The results of our study showed that redesigning and changing the workers’working posture and working system improved the performance of seaweed farmersas revealed by the decrease of musculoskeletal complaints to 56.15% (p < 0.05); bydecrease in general fatigue to 50.84% (p < 0.05); by the increase in productivity to37.93% (p < 0.05), and by the increase in income to 41.62% (p < 0.05). The qualityof the dried seaweed was also improved as could be seen from the decrease in watercontent to 29.24% (p < 0.05) and decrease in impurities to 33.33% (p < 0.05).From our data it could be inferred that changing the workers’ working bodyposture and working system significantly improved both their performance and thequality of their product.
Pemurnian Biogas Dari Gas Pengotor Hidrogen Sulfida (H2S) Dengan Memanfaatkan Limbah Geram Besi Proses Pembubutan Trisna Negara, Komang Metty; Tirta Nindhia, Tjokorda Gde; Sucipta, I Made; Atmika, I Ketut Adi; Putra Negara, Dewa Ngakan Ketut; Surata, I Wayan; Komaladewi, A.A.I.A. Sri
Jurnal Energi Dan Manufaktur Vol 5, No 1 (2012): Volume 5, Nomor 1, Oktober 2012
Publisher : Jurnal Energi Dan Manufaktur

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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
Pelapisan perunggu dengan krom untuk meningkatkan kekerasan permukaan Surata, I Wayan
Jurnal Energi Dan Manufaktur Vol 1, No 1 Juni 2006
Publisher : Jurnal Energi Dan Manufaktur

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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.
Teknik Squat dan Stoop Menggunakan Electromyography pada Pekerjaan Manual Materials Handling Surata, I Wayan
Jurnal Teknik Industri Vol 15, No 1 (2013): JUNE 2013
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (231.371 KB) | DOI: 10.9744/jti.15.1.33-38

Abstract

Manual materials handling has been identified as the most common cause of work-related musculoskeletal disorders. Among the manual material handling activities, lifting has long been regarded as an activity associated with a high risk of low-back pain. Lifting studies have mainly focused on the squat and stoop lifting techniques as an effort to improve the protection of workers from low back discomfort. However, neither is ideal and the benefits of one technique over another have proved inconclusive. The purpose of this study was to examine and compare the squat and stoop lifting techniques through analysis of muscles activation by using electromyography. Six volunteers participated in the study, and were required to lift a weight with squat and stoop techniques, with two types of loading at 1,7 kg and 6,7 kg. Observations were made on the rectus femoris, biceps femoris, and multifidus muscles. The results of study showed that the squat technique had higher levels of muscle activation compared to stoop technique on rectus femoris muscle. On the contrary, squat technique had lower muscle activation compared to stoop technique on biceps fermoris muscle. Meanwhile, both techniques squat and stoop had the same level of muscle activation on multifidus muscle. Conclusion, squat and stoop lifting techniques had the same opportunities to use.
PENGGUNAAN DINNER PLATE YANG ANTROPOMETRIS PADA AMERICAN SERVICE MENINGKATKAN KINERJA PELAYANAN MAHASISWA PRAKTEK DI RESTORAN SEKOLAH TINGGI PARIWISATA NUSA DUA BALI Budiani, Ni Putu Ariesta; Adiputra, Nyoman; Surata, I Wayan
Jurnal Ergonomi Indonesia (The Indonesian Journal of Ergonomic) Volume 2, No 1, 2016
Publisher : Jurnal Ergonomi Indonesia (The Indonesian Journal of Ergonomic)

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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.
Teknik Squat dan Stoop Menggunakan Electromyography pada Pekerjaan Manual Materials Handling Surata, I Wayan
Jurnal Teknik Industri Vol 15, No 1 (2013): JUNE 2013
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (231.371 KB) | DOI: 10.9744/jti.15.1.33-38

Abstract

Manual materials handling has been identified as the most common cause of work-related musculoskeletal disorders. Among the manual material handling activities, lifting has long been regarded as an activity associated with a high risk of low-back pain. Lifting studies have mainly focused on the squat and stoop lifting techniques as an effort to improve the protection of workers from low back discomfort. However, neither is ideal and the benefits of one technique over another have proved inconclusive. The purpose of this study was to examine and compare the squat and stoop lifting techniques through analysis of muscles activation by using electromyography. Six volunteers participated in the study, and were required to lift a weight with squat and stoop techniques, with two types of loading at 1,7 kg and 6,7 kg. Observations were made on the rectus femoris, biceps femoris, and multifidus muscles. The results of study showed that the squat technique had higher levels of muscle activation compared to stoop technique on rectus femoris muscle. On the contrary, squat technique had lower muscle activation compared to stoop technique on biceps fermoris muscle. Meanwhile, both techniques squat and stoop had the same level of muscle activation on multifidus muscle. Conclusion, squat and stoop lifting techniques had the same opportunities to use.
PENGEMBANGAN OBJEK WISATA PANTAI KLINGKING DESA BUNGA MEKAR, KECAMATAN NUSA PENIDA, KABUPATEN KLUNGKUNG Surata, I Wayan; Nindhia, Tjokorda GdeTirta; Nindhia, Tjokorda Sari
Buletin Udayana Mengabdi Vol 17 No 3 (2018): Juli 2018
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

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Hardness Characteristics of Hybrid Composite Brake Lining on Olie's Absorption Media Adi Atmika, I Ketut; Ary Subagia, IDG.; Surata, I Wayan; Sutantra, I Nyoman
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ijeet.2019.v04.i01.p15

Abstract

Brake lining technology is developing rapidly to adjust the absorption media in which the vehicle's braking system is operating. Material commonly used as a brake lining is asbestos and its alloys, but this material is very dangerous to the environment and health. This research was developed to overcome these problems, namely finding alternative brake lining pads material that has good mechanical and physical properties. Brake lining material is made from a hybrid composite reinforced basalt, shellfish, alumina, and phenolic resin (PR-51510i) as a binding matrix. This brake lining material is produced through a process of sintering at a temperature of 150 ? C with a load of  2000 kg for 30 minutes. These hybrid composites are made in as many as three variations, each of which is tested for olie absorption at several variations of immersion time. Immersion 3 days hardness of hybrid composite and asbestos brake lining material is still quite high between 24-28 HVN. The highest hardness at that time was an H1 specimen of 28.00 HVN. Then the hardness of the brake lining material decreases with the addition of immersion time and is close to stable at the
Biocompatible Material from Indonesian Natural Resource of Wild Silkmoth Cocoon Nindhia, Tjokorda Gde Tirta; Knejzl?k, Zdenek; Ruml, Tom??; Surata, I Wayan; Nindhia, Tjokorda Sari
Advances in Tropical Biodiversity and Environmental Sciences Vol 1 No 2 (2017): ATBES
Publisher : Institute for Research and Community Services Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2017.v01.i02.p05

Abstract

Silk can be produced by spider or insect and have prospect as biomaterial for regenerative healing in medical treatment. Silk having physical and chemical properties that support biocompatibility in the living things..In this research, silk that was obtained from Indonesia natural resource of Attacus atlas silkmoth was explored and then will be  developed for biocompatible biomaterial. The treatment with NaOH was developed to separate the fiber from the cocoon. The obtained fiber is investigated its mechanical property by performing tensile test for single fiber. The biocompatibility testing was conducted with human cell (osteosarccoma) cultivation. The result identify that separation by using NaOH yield better better mechanical properties comparing konvenstional method with boiling in hot water. Biocompatibility testing indicate that the the fiber having good biocompatibility.