a nano/ultra-fine grain al-0.2wt% zr alloy was produced by accumulated roll bonding (arb) processafter 10 cycles. the fraction of high angle grain boundaries increased from 8% to 65.4% during 10passes during arb process. this alloy was subjected to tensile test at different temperatures (523,573and 623 k) and strain rates (0.1 and 0.01 s-1). the optimum condition of temperature and strain rate ...

conclusions silent ventricular systolic dysfunction was more common in the patients with sle than in the control group. newer echocardiographic techniques such as two-dimensional ste provide an earlier chance for the detection of subclinical lv systolic dysfunction. our findings were independent of the traditional risk factors. results the mean duration of sle was 5.5 ± 3.4 years in our patient...

In this work dynamic recrystallization behavior of AISI 403 martensitic stainless steel was studied using hot compression tests over temperature range of 900 C -1200 C and strain rate range of 0.001 s-1 - 1 s-1. The obtained flow curves showed that the hot compression behavior of the alloy is controlled by dynamic recrystallization. The flow stress and strain corresponding to the critical, pe...

background heat is a harmful factor in workplaces that causes physiologic and cognitive changes in workers. objectives the purpose of this study was to investigate the effect of cooling vest on heat strain and reaction time while wearing chemical-biological-nuclear protective clothes. methods twelve male students with mean age of 25 ± 2 and body mass index (bmi) of 23 ± 1.5 were recruited in th...

By using two-dimensional speckle tracking echocardiography, we aimed to investigate the structural and functional changes on myocardium in chronic asymptomatic alcoholics without any cardiovascular disease. Forty-one consecutive asymptomatic male alcoholics who were admitted to the outpatient alcoholism unit and 30 age matched healthy male volunteers selected as the control group were enrolled ...

Analysis of myocardial deformation, or strain imaging, is becoming part of routine echocardiography. The most widely accepted parameter to date has been global longitudinal strain as a measure of global left ventricular (LV) function. Global longitudinal strain (LS) of the LV, in (negative) percent, is the average of the maximal shortening (in percent) in the apicobasal direction of each of 18 ...

BACKGROUND Several studies have demonstrated that uremic patients who have preserved left ventricular ejection fraction (LVEF) could still have the potential for systolic dysfunction. The aim of this study was to assess the differences between the left ventricular (LV) myocardial function in hemodialysis and nondialysis uremic patients based on three-dimensional speckle-tracking echocardiograph...

Aims Recent studies showed reduced maximal force generating capacity of cardiomyocytes from hypertrophic cardiomyopathy (HCM) patients with normal systolic function. In the present study we investigated if reduced maximal force generating capacity at cellular level is associated with local systolic dysfunction in HCM patients. A total of 46 HCM patients (age 51 ±10 years, 64% male) underwent pr...

SEE PAGE 400 S afety, reliability, ease of use, and relatively low cost has placed echocardiography at the forefront of imaging modalities utilized in the assessment of cardiac function. Over the last 2 decades, techniques to detect pre-clinical cardiac dysfunction, such as the echocardiographic estimation of myocardial strain and strain rate, have been developed. Myocardial strain measures the...