نتایج جستجو برای: surface stress effects

تعداد نتایج: 2452068  

B Kebli, F Guerrache S Berkane

A solution is presented to a doubly mixed boundary value problem of the torsion of an elastic layer, partially resting on a rigid circular base by a circular rigid punch attached to its surface. This problem is reduced to a system of dual integral equations using the Boussinesq stress functions and the Hankel integral transforms. With the help of the Gegenbauer expansion formula of the Bessel f...

2015
Jennifer L. Wilkening Chris Ray Johanna Varner

The American pika (Ochotona princeps) is considered a sentinel species for detecting ecological effects of climate change. Pikas are declining within a large portion of their range, and ongoing research suggests loss of sub-surface ice as a mechanism. However, no studies have demonstrated physiological responses of pikas to sub-surface ice features. Here we present the first analysis of physiol...

Journal: :International Journal of Solids and Structures 2006

2007
F. Veron G. Saxena S. K. Misra

[1] The stress and drag at the surface of the ocean are crucial parameters for both short term forecasting and the modeling of long-term global climate trends. However, the partition between viscous, turbulent, and wave stresses, and in particular the effects of airflow separation are not well understood. We present direct measurements of the velocity in the airflow above wind-generated waves. ...

2004
M. P. Blodgett P. B. Nagy

Experimental results are presented to illustrate that there exists a unique window of opportunity for eddy current NDE of residual stress in surface-treated nickel-base superalloys. In light of its frequency-dependent penetration depth, the measurement of eddy current conductivity has been suggested as a possible means to allow the nondestructive evaluation of subsurface residual stresses in su...

2016
Dan-Dan Li Bo Xie Xiao-Jun Wu Jing-Jing Li Ya Ding Xi-Zhi Wen Xing Zhang Shu-Guang Zhu Wei Liu Xiao-Shi Zhang Rui-Qing Peng

Calreticulin (CRT) exposure on the cell surface is essential for inducing immunogenic cell death by chemotherapy. Recent studies have shown conflicting effects of chemotherapy-induced autophagy on CRT exposure in cancer cells. Our data revealed that surface-exposed CRT (Ecto-CRT) emission was attenuated by inhibition of autophagy at early stages; however, inhibition of autophagy at late stages ...

2017
Gang Li Shengguan Qu Mingxin Xie Zhaojun Ren Xiaoqiang Li

The main purpose of this paper was to investigate the effect of a surface plastic deformation layer introduced by multi-pass ultrasonic surface rolling (MUSR) on the mechanical and fatigue properties of HIP Ti-6Al-4V alloys. Some microscopic analysis methods (SEM, TEM and XRD) were used to characterize the modified microstructure in the material surface layer. The results indicated that the mat...

Journal: :Physical review letters 1993
Fiorentini Methfessel Scheffler

The reconstruction mechanism of (001) fcc transition metal surfaces is investigated using a full-potential all-electron electronic structure method together with density-functional theory. Total-energy calculations confirm the experimental finding that a close-packed quasi-hexagonal overlayer reconstruction is possible for the late 5d-metals Ir, Pt, and Au, while it is disfavoured in the isoval...

2009
James P. Blanchard Qiyang Hu Nasr Ghoniem

Dry wall laser IFE chambers will experience large, transient heat and particle fluxes as the target yield products reach the wall. These threats, consisting of xrays, ions, and neutrons, can lead to wall failure caused by transient stresses or as a result of deposited ions in the near-surface layer. We have developed a unified model for the calculation of temperatures, stresses, strains, and fr...

2012
Pär A.T. Olsson Harold S. Park

We present a theoretical model to calculate the flexural rigidity of nanowires from three-dimensional elasticity theory that incorporates the effects of surface stress and surface elasticity. The unique features of the model are that it incorporates, through the second moment, the heterogeneous nature of elasticity across the nanowire cross section, and that it accounts for transverse surface-s...

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