نتایج جستجو برای: impact loading

تعداد نتایج: 831871  

Journal: :journal of research in health sciences 0
mojtaba mirakhorlo mahmood reza azghani sedighe kahrizi

background : lifting methods, including standing stance and techniques have wide effects on spine loading and stability. previous studies explored lifting techniques in many biomechanical terms and documented changes in muscular and postural response of body as a function of techniques .however, the impact of standing stance and lifting technique on human musculoskeletal had not been investigat...

Journal: :international journal of environmental research 2013
l. yang k. lei w. yan y. li

this study investigated the impact of internal nitrogen and phosphorus loading on water qualityof lake chaohu, china. results showed that the overall mean concentration of tn and tp in lake water was1.09±0.84 and 0.15±0.84 (sd) mg/l, respectively, indicating lake chaohu was highly eutrophic during thestudy period. mean benthic flux of nh4 +, no3 -, and po4 3- were 3.56±1.52 mg n/m2/d, -0.14±0.4...

Journal: :international journal of environmental research 0
l. yang river and coastal environment research center, chinese research academy of environmental sciences, beijing 100012, p. r. china k. lei river and coastal environment research center, chinese research academy of environmental sciences, beijing 100012, p. r. china w. yan institute of geographic sciences and natural resources research, chinese academy of sciencesÿ11a datun road, beijing, 100101, p.r. china a. mohseni-bandpei health faculty, shahid beheshti university of medical sciences, tehran, iran

this study investigated the impact of internal nitrogen and phosphorus loading on water qualityof lake chaohu, china. results showed that the overall mean concentration of tn and tp in lake water was1.09±0.84 and 0.15±0.84 (sd) mg/l, respectively, indicating lake chaohu was highly eutrophic during thestudy period. mean benthic flux of nh4 +, no3 -, and po4 3- were 3.56±1.52 mg n/m2/d, -0.14±0.4...

2009
Frank Pintar John Humm Narayan Yoganandan Peter G. Martin

Near side impact crashes – especially pole impacts – have the potential to induce antero-lateral oblique loads to the chest. Current side impact dummies and most laboratory experimental studies have been designed to assess direct lateral impacts. A recent analysis of real world crashes indicated that the human chest experiences oblique loading in side impact crashes – in particular crashes into...

Journal: :Computer methods in biomechanics and biomedical engineering 2014
Andrew Post Anna Oeur Evan Walsh Blaine Hoshizaki Michael D Gilchrist

American football reports high incidences of head injuries, in particular, concussion. Research has described concussion as primarily a rotation dominant injury affecting the diffuse areas of brain tissue. Current standards do not measure how helmets manage rotational acceleration or how acceleration loading curves influence brain deformation from an impact and thus are missing important inform...

2014
Chow-Shing Shin Shien-Kuei Liaw Shi-Wei Yang

It has been shown that impact damage to composite materials can be revealed by embedded Fiber Bragg Gratings (FBG) as a broadening and splitting of the latter's characteristic narrow peak reflected spectrum. The current work further subjected the impact damaged composite to cyclic loading and found that the FBG spectrum gradually submerged into a rise of background intensity as internal damages...

Journal: :Bone 2006
Riku Nikander Harri Sievänen Kirsti Uusi-Rasi Ari Heinonen Pekka Kannus

This cross-sectional study of adult female athletes assessed whether the apparent loading-related differences in bone structure are primarily associated with the loading type or the muscle performance-related joint moments. Several structural variables at shaft sites of the tibia, radius and humerus, and distal sites of the tibia and radius were measured with peripheral quantitative computed to...

Transformer is one of the most important components of power system, which determining its reliability is very important. To evaluate transformer overall reliability, in addition to probability of failures occur due to chance events, the probability of failures owing to aging should be taken into account. To determine transformer reliability in aging area, estimating its remaining life is of gr...

2013
Kim Thorsen Anders O. Kristoffersson Ulf H. Lerner Ronny P. Lorentzon

In this study we describe, to our knowledge, the first experiment using the microdialysis technique for studying the release of prostaglandin E 2 (PGE 2 ) in the proximal tibia metaphysis secondary to mechanical loading. Nine healthy females, six in the loading group and three controls, mean age 34 6 2 (years 6 SEM), participated. A standard microdialysis catheter was inserted into the tibia me...

Farhadi, Mokhtari,

Automobile light weight structural composites are subjected to the various loadings in their service lives. Honeycombs are increasingly used as core structures in automobile light weight structures as energy absorbers. In this paper the energy absorption of honeycomb panels under impact of cylindrical projectile is numerically and experimentally studied. The effect of the core materials and cro...

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