in this paper, effect of hydrogen diffusion on 2.25cr-1mo steel with ferritic-bainitic and martensitic microstructure has been investigated. hydrogen embrittlement of this steel was investigated by doing experimental such as delayed fracture and slow strain rate tests. result of this research was showed that the steel with martensitic  microstructure strongly affected by hydrogen diffusion and ...

background : in the hot weather overweight and obesity are considered as significant risk factors for incidence of cardiac strain in workers. this study is aimed to compare cardiac strain among overweight and normal-weighted workers in hot and humid conditions of the south of iran. methods : this cross-sectional study was conducted on 71 workers in the south of iran in the summer of 2010. the h...

  Introduction : The aim of this study is to obtain new insight into possible relation between functional properties of slow concealed pathway and rate-dependent properties of AV-node.   Methods : Rate-dependent nodal properties of recovery, facilitation, and fatigue were characterized by stimulation protocols in one groups of (N=7) isolated superfused AV-Nodal rabbits. Small miniature lesions ...

Native English speakers were trained to identify Japanese vowel length with sentences spoken at a fast rate, and their test scores before and after training were compared with those of a control group. Results indicated that the present training with little variability in speaking rate did not yield a robust perceptual improvement for the trained group. However, among the three rates tested (sl...

The slow degradation of returned straw adversely affects seedling survival rate. To shorten the time lignin in maize warm temperate regions, a cellulolytic microbial strain that can secrete polymer with high enzymatic activity was isolated from humus, which helped to identify an effective expedite decomposition straw. Using molecular biology techniques primary screening and re-screening using s...

A rapid fracture test in four-point bending is proposed to assess hydrogen embrittlement (HE) susceptibility of high strength martensitic steels. The novelty this technique the rate loading, whereas conventional approaches require prolonged slow strain testing. essential fractographic features required identify mechanisms HE failure remain evident, despite fast loading conditions. To demonstrat...

Background: This study was set up to evaluate the effect of ovarian tissue slow freezing on in vitro growth and pattern of maturation genes expression in mouse preantral follicles encapsulated within alginate hydrogel. Materials and Methods: Ovaries of 12-14 days old female NMRI mice were randomly allocated into control and slow freezing groups. In slow freezing group, ovaries were equilibrated...

T his paper proposes a new unit root test against the alternative of symmetric or asymmetric exponential smooth transition autoregressive (AESTAR) nonlinearity that accounts for multiple smooth breaks. We provide small sample properties which indicate the test statistics have good empirical size and power. Also, we compared small sample properties of the test statistics with Christop...