نتایج جستجو برای: in instability

تعداد نتایج: 16988536  

A Ghorbanpour Arani, I Alinaghian M Jamali M Mosayyebi R Kolahchi

In this study, a realistic model for dynamic instability of embedded single-walled nanotubes (SWCNTs) conveying pulsating fluid is presented considering the viscoelastic property of the nanotubes using Kelvin–Voigt model. SWCNTs are placed in longitudinal magnetic fields and modeled by sinusoidal shear deformation beam theory (SSDBT) as well as modified couple stress theory. The effect of slip ...

Journal: :iranian journal of science and technology transactions of mechanical engineering 2015
r. ansari r. gholami

a nonlocal beam model based on the bernoulli–euler beam theory is presented to investigate the dynamic stability of embedded single-walled carbon nanotubes (swcnts) in thermal environment under combined static and periodic axial loads. the dynamic stability analysis is carried out by including the effects of small-scale parameter, temperature change and elastic medium. the equation of motion is...

Background and Objectives: Among the foot orthoses prescribed to improve postural control in chronic ankle instability, foot orthoses designed to affect both types of mechanical and functional instability have a limited research background. In the present study, a type of foot orthosis named the custom mold with a raised ridge around the perimeter was designed, and manufactured, and its effect ...

Recently instability in Iranian exchange market, particularly after imposing huge economic sanctions has generated a lot interest among economist and academicians to investigate driving force of this instability. This paper estimates a new nonlinear exchange market pressure for Iran’s economy using MSMH(2)-VAR(2) method. The empirical results identify the two episodes of exchange market pr...

ژورنال: توانبخشی 2016

Objective: The aim of this study was the comparison of the functional stability of dominant and non-dominant shoulder in female volleyball players with and without anterior shoulder instability, using YBT-UQ. Materials and methods: In this descriptive study, 28 female university volleyball players (age=20 to 25 years) were categorized into healthy (n=14) and anterior shoulder instability (n=14)...

Journal: :iranian journal of catalysis 0
shahab khameneh asl materials eng. department, mechanical eng. faculty, university of tabriz, tabriz, iran, p.o. box: 5166614766. deniz unar chemical eng. faculty, middle east university of technology, ankara, turkey.

titania nanotubes (tnt) prepared by anodization of ti foils were used for water splitting in a standalone cell. the concentration polarization between the anode side (1m naoh) and cathode side (0.5 m h2so4) ensured that the water splitting reaction could take place with no external bias and separate h2 and o2 evolution could be achieved. the destruction of tnt structures under 365 nm uv irradia...

Journal: :iranian journal of science and technology transactions of civil engineering 2015
s. tsantaki l. wurzer c. jäger c. adam m. oberguggenberger

recently, two of the authors have introduced the collapse capacity spectrummethodology, which allows the assessment of the collapse capacity of highly inelastic p-deltasensitive regular frame structures without performing non-linear time-history analyses. the mainingredient of this method is the collapse capacity spectrum, which represents the seismic collapsecapacity of an inelastic non-deteri...

Journal: :iranian journal of oil & gas science and technology 2016
aghil moslemizadeh seyed reza shadizadeh

fluid invasion from water-based drilling mud (wbdm) into the shale formations causes swelling,high pressure zone near the wellbore wall, and eventually wellbore instability problems duringdrilling operations. for the stability of the wellbore, physical plugging of nanoscale pore throats couldbe considered as a logical approach toward avoiding the fluid invasion into the shale formation. thispap...

ژورنال: توانبخشی 2017

Objective Some individuals with Chronic Ankle Instability (CAI) termed as functional ankle instability (FAI) suffer from repetitive ankle giving way and feeling of ankle joint instability during dynamic activities like walking. Walking, as a postural task, requires some central attention to integrate sensory inputs, estimate, and plan and produce proper motor outputs. Attention demanding cognit...

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