نتایج جستجو برای: velocity conditions

تعداد نتایج: 972158  

2006
Carsten Ebmeyer

The system −divS(D(u)) + (u · ∇)u +∇π = f , divu = 0, is considered on a bounded three-dimensional domain under no–stick boundary value conditions, where S has p-structure for some p < 2 and D(u) is the symmetrized gradient of u. Various regularity results for the velocity u and the pressure π in fractional order Sobolev and Nikolskii spaces are obtained.

2002
OANH CHAU VIORICA VENERA MOTREANU

We consider dynamic problems which describe frictional contact between a body and a foundation. The constitutive law is viscoelastic or elastic and the frictional contact is modelled by a general subdifferential condition on the velocity, including the normal damped responses. We derive weak formulations for the models and prove existence and uniqueness results. The proofs are based on the theo...

Journal: :jundishapur journal of health sciences 0
peymaneh habibi department of occupational health engineering, student research center, school of health, isfahan university of medical sciences, isfahan, ir iran azam amanallahi department of occupational health engineering, student research center, school of health, isfahan university of medical sciences, isfahan, ir iran fatemeh islami department of occupational health engineering, student research center, school of health, isfahan university of medical sciences, isfahan, ir iran fahimeh naimzadeh department of occupational health engineering, student research center, school of health, isfahan university of medical sciences, isfahan, ir iran habiboallah dehghan department of occupational health engineering, student research center, school of health, isfahan university of medical sciences, isfahan, ir iran; department of occupational health engineering, student research center, school of health, isfahan university of medical sciences, isfahan, ir iran. tel: +98-3117922733, fax: +98-3116682509

conclusions the results showed that the heat stress increased by increasing air velocity and humidity in both groups. the air velocity with high humidity can be considered as a positive factor in the occurrence of heat strain. therefore, the incidence of heat stress decreases with the increase of humidity and reduction of air velocity or with increase of air velocity and reduction of humidity i...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2010
atieh adli fariborz rashidi rouhollah farajzadeh

in petroleum production, produced water re-injection (pwri) has earned much interest among disposal methods of the produced water. however, presence of the contaminants in the produced waters usually results in formation damage in well bores and their surrounding fracture systems. in the present study, modeling of external cake formation on a fracture in unsteady-state conditions is discussed. ...

Journal: :journal of applied and computational mechanics 0
gbeminiyi m sobamowo university of lagos

in this paper, nonlinear dynamic behaviours of carbon nanotube conveying fluidwith slip boundary conditions is studied using variation iteration method. the developed solutions are used to investigate the effects of various parameters on the nonlinear vibration of the nanotube. from the result, it is observed that increase in the slip parameter leads to decrease in the frequency of vibration an...

H. R. Sheibani and H. Bayyat,

A physical model of gabion overflow dams was studied to determine the velocity profile and Reynolds shear stress. Physical tests were done under two different conditions of dam crest, overflow dams with impermeable and with permeable crests. Instantaneous velocity components over dam crest were measured by an ADV (Acoustic Doppler Velocimeter) instrument. This instrument is capable of measuring...

M Ghadiri, M Hamisi N Shafiei

In this paper, vibration analysis of rotary tapered axially functionally graded (AFG) Timoshenko nanobeam is investigated in a thermal environment based on nonlocal theory. The governing equations of motion and the related boundary conditions are derived by means of Hamilton’s principle based on the first order shear deformation theory of beams. The solution method is considered using generaliz...

H. R. Sheibani and H. Bayyat,

A physical model of gabion overflow dams was studied to determine the velocity profile and Reynolds shear stress. Physical tests were done under two different conditions of dam crest, overflow dams with impermeable and with permeable crests. Instantaneous velocity components over dam crest were measured by an ADV (Acoustic Doppler Velocimeter) instrument. This instrument is capable of measuring...

Journal: :سالمند 0
کیوان دواتگران keyvan davatgaran university of social welfare &amp; rehabilitation sciences, tehran,iranدانشگاه علوم بهزیستی و توانبخشی مژگان مقدم mojgan moghadam university of social welfare &amp; rehabilitation sciences, tehran,iranدانشگاه علوم بهزیستی و توانبخشی مهیار صلواتی mahyar salavati university of social welfare &amp; rehabilitation sciences, tehran,iranدانشگاه علوم بهزیستی و توانبخشی

objectives: the present study aimsed to examine the reliability of forceplate parameters under both single and dual task conditions and in different levels of postural difficulty. methods & materials: the healthy elderly+65, were assessed with aone-week interval, with a random combination of three levels of postural difficulty (i.e., standing on a rigid surface with eyes open, standing on a rig...

Journal: :journal of applied and computational mechanics 0
a. azizi department of mechanical and aerospace engineering, science and research branch, islamic azad university, tehran, iran s. mohammad reza khalili centre of excellence for research in advanced materials and structures, faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran k. malekzadeh fard malek ashtar university of technology, department of mechanical engineering, 4th kilameter, makhsous rd, tehran, iran

in this paper, dynamic analysis of the composite truncated sandwich conical shells (stcs) with various boundary conditions subjected to low velocity impact was studied analytically, based on higher order sandwich panel theory. impact was assumed to occur normally over to the top face-sheet and the contact force history is predicted using two solution models of the motion are derived based on ha...

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