Ductile-brittle fracture transition was investigated using compact tension (CT) specimens from -70 o C to 40 o C for a carbon steel. Large deformation finite element analysis has been carried out to simulate the stable crack growth in the compact tension (CT, a/W=0.6), three point-point bend (SE(B), a/W=0.1) and centre-cracked tension (M(T), a/W=0.5) specimens. Experimental crack tip opening di...

Cell rolling on the vascular endothelium plays an important role in trafficking of leukocytes, stem cells, and cancer cells. We describe a semianalytical model of cell rolling that focuses on the microvillus as the unit of cell-substrate interaction and integrates microvillus mechanics, receptor clustering, force-dependent receptor-ligand kinetics, and cortical tension that enables incorporatio...

Background & Aims: The aim of this study was to the compare perfectionism, aggression and coping styles in patients with migraine and tension-type headache and healthy individuals. Methods: In this casual-comparative method study, the studied sample consisted of 42 patients with tension-type headache diagnosis, 40 patients with migraine headache selected among those referred to medical centers ...

A model for the contractility of cells is presented that accounts for the dynamic reorganization of the cytoskeleton. It is motivated by three key biochemical processes: (i) an activation signal that triggers actin polymerization and myosin phosphorylation, (ii) the tension-dependent assembly of the actin and myosin into stress fibres, and (iii) the cross-bridge cycling between the actin and th...

Introduction: The efficacy of behavioral treatments for elevated blood pressure (BP) is unclear, and the relative effectiveness of improvements in common intervention targets such as cardiorespiratory fitness, stress, and body weight requires clarification. Aims of this research were to assess the effectiveness of a community-based, health behaviorchange program for improving resting heart rate...

BACKGROUND Stress management interventions may prove useful in preventing the detrimental effects of stress on health. This study assessed the effects of a stress management intervention on the psychophysiological response to stress in patients with rheumatoid arthritis (RA). METHODS Seventy-four patients with RA, who were randomly assigned to either a control group or a group that received s...

Based on the small deflection beam theory, bending equation with axial tension of suspended pipe partially buried in the linear elastic soil is established. And the corresponding boundary conditions are given according to the stress and deformation characteristics of suspended section and buried section. Then deflection equation for the suspended section is deduced. Afterwards, the stress and c...

Molecular dynamics simulations reveal the asymmetrical yield strength of twinned copper nanowires under tension and compression. The simulation results show that the strength of nanowires depends on loading conditions, morphologies, and twin spacing. Under tensile loading condition the Schmidt factor of the leading partial is larger than that under compression. Effectively, the yield strength u...

The concurrent bilateral stress fractures of the femoral neck (SFFN) are extremely rare injuries in individuals without excessive bone activities. We present a case with compression type stress fracture in the right femoral neck, and displaced type stress fracture in the left femoral neck which might progress from an undiagnosed tension type fracture. Based on the findings of the literature rev...