نتایج جستجو برای: back compressive force

تعداد نتایج: 361244  

Journal: :Ergonomics 2004
Marco J M Hoozemans P Paul F M Kuijer Idsart Kingma Jaap H van Dieën Wiebe H K de Vries Luc H V van der Woude Dirk Jan H E J Veeger Allard J van der Beek Monique H W Frings-Dresen

The objective of this study was to quantify the mechanical load on the low back and shoulders during pushing and pulling in combination with three task constraints: the use of one or two hands, three cart weights, and two handle heights. The second objective was to explore the relation between the initial and sustained exerted forces and the mechanical load on the low back and shoulders. Detail...

Journal: :DNA and cell biology 2011
Jiapei Wu Yu Li Xiaofeng Fan Chaoliang Zhang Yu Wang Zhihe Zhao

Cyclic compressive force is an important mechanical stimulus on periodontal ligament (PDL). The differential expression of genes in PDL cells is thought to be involved in the remodeling of periodontal tissues subjected to mechanical stress. However, little is known about differentially expressed genes in PDL cells under cyclic compressive force. In our study, human PDL cells were subjected to 4...

Journal: :Veterinary and comparative orthopaedics and traumatology : V.C.O.T 2012
S C Fisher R M McLaughlin S H Elder

The in vitro biomechanical properties of three methods for internal fixation of femoral neck fractures were evaluated. Fifty cadaveric femura from Beagle dogs were used. Ten intact femora served as controls. In 40 femura, an osteotomy of the femoral neck was performed to simulate a transverse fracture. With the remaining 30 femura, three repair methods (two medium Orthofix pins, a 2.7 mm cort...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2006
Vincent Richefeu Moulay Saïd El Youssoufi Farhang Radjaï

We investigate shear strength properties of wet granular materials in the pendular state (i.e., the state where the liquid phase is discontinuous) as a function of water content. Sand and glass beads were wetted and tested in a direct shear cell and under various confining pressures. In parallel, we carried out three-dimensional molecular dynamics simulations by using an explicit equation expre...

Journal: :journal of agricultural science and technology 2011
h. maghsoudi m. h. khoshtaghaza s. minaei h. zaki dizaji

mechanical properties of non-split pistachio nuts are among the lada required for the design of equipment needed for processing of the nut. unsplit pistachio nut samples were uniaxially loaded to determine the nut’s needed splitting force and energy, as well as poisson’s ratio and young’s modulus of elasticity. the tests were carried out at four moisture contents (5, 10, 15 and 20% wb), under f...

Journal: :international journal of electrical and electronics engineering 0
a. shirii a. shoulaieii

input frequency is one of the important variables in design and performance analysis of single-sided linear induction motors (slims). changing the frequency changes both the dimension of the slim in design process and the performance of the designed motor. the frequency influences the induced eddy currents in the secondary sheet as well as saturation level of the secondary back-iron. in this pa...

Journal: :ACS nano 2009
Tolou Shokuhfar Ganesh K Arumugam Patricia A Heiden Reza S Yassar Craig Friedrich

The mechanical compressive properties of individual thin-wall and thick-wall TiO(2) nanotubes were directly measured for the first time. Nanotubes with outside diameters of 75 and 110 nm and wall thicknesses of 5 and 15 nm, respectively, were axially compressed inside a 400 keV high-resolution transmission electron microscope (TEM) using a new fully integrated TEM-atomic force microscope (AFM) ...

2015
Daniel M Czajkowsky Jielin Sun Yi Shen Zhifeng Shao Taekjip Ha

Perfringolysin O (PFO) is a prototypical member of a large family of pore-forming proteins that undergo a significant reduction in height during the transition from the membrane-assembled prepore to the membrane-inserted pore. Here, we show that targeted application of compressive forces can catalyze this conformational change in individual PFO complexes trapped at the prepore stage, recapitula...

Journal: :Journal of biomechanical engineering 2005
Abhijeet Joshi Samir Mehta Edward Vresilovic Andrew Karduna Michele Marcolongo

Nucleus replacement by a synthetic material is a recent trend for treatment of lower back pain. Hydrogel nucleus implants were prepared with variations in implant modulus, height, and diameter Human lumbar intervertebral discs (IVDs) were tested in compression for intact, denucleated, and implanted condition. Implantation of nucleus implants with different material and geometric parameters into...

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