نتایج جستجو برای: temperature stress

تعداد نتایج: 869349  

2018
Edward Narayan Gregory Sawyer Simone Parisella

Reproductive wastage is a key issue for sheep producers, both regionally and globally. The reproductive output of farm animals can be influenced by physiological and environmental factors. Rapid and reliable quantification of physiological stress can provide a useful tool for designing and testing on-farm management interventions to improve farm animal welfare and productivity. In this study, w...

2005
H Tobushi D Shimada S Hayashi

The thermomechanical properties of polyurethane shape memory polymer (SMP) foams were investigated experimentally. The results obtained can be summarized as follows. (1) By cooling the foam after compressive deformation at high temperature, stress decreases and the deformed shape is Ž xed. Stress decreases markedly in the region of temperature below the glass transition temperature Tg during th...

Journal: :Acta of bioengineering and biomechanics 2012
Alessandro Rubini Emanuele L Carniel Arturo N Natali

The mechanical characteristics of respiratory system tissues include visco-elastic behaviour. In particular, after mechanical unloading, i.e., a reduction in respiratory system volume, the lower stress achieved slowly increases, approaching higher constant value, due to visco-elastic stress recovery. We performed experiments in which constant deflation flow arrest was applied in rats to study t...

2014
S. Naveed M. Aslam M. A. Maqbool S. Bano Q. U. Zaman

Maize is a dynamic cereal of world’s agriculture community and is grown both in spring and autumn seasons in Pakistan. In case of spring sowing (February sowing) both pistillate and staminate flowers face high temperature stress and ultimately results in poor seed setting because of increased silk dryness and pollen desiccation. Maize accessions were identified on the basis of their performance...

2015
O. O Olatunji

The study employed the finite element method to develop a validated theoretical model to investigate the distribution of thermal hoop stress around the teeth of a spur gear operating in a filler machine. Three cases of temperature distribution along the radius of a gear tooth were assumed and investigated. The outcome showed that the maximum effective stress occurs at the tip of the gear tooth ...

Journal: :journal of agricultural science and technology 2015
s. segura-monroy a. uribe-vallejo a. ramirez-godoy h. restrepo-diaz

the anatomical and epidermal characteristics, as well as the physiological response, of 'colombia' ecotype cape gooseberry plants treated or untreated with foliar applications of kaolin at 2 irrigation levels (well-irrigated plants vs. water-stressed plants) were evaluated. relative water content (rwc), stomatal density, and chlorophyll index were reduced under water stress. water stress increa...

2008
Ming-Wen Ma Chih-Yang Chen Yi-Hong Wu Kuo-Hsing Kao Tien-Sheng Chao

In this letter, the characteristics of positive bias temperature instability (PBTI) and hot carrier stress (HCS) for the lowtemperature poly-Si thin-film transistors (LTPS-TFTs) with HfO2 gate dielectric are well investigated for the first time. Under room temperature stress condition, the PBTI shows a more serious degradation than does HCS, indicating that the gate bias stress would dominate t...

2018
Yanchang Qi Zhiquan Wu Xin Zhang Chengyong Ma

In order to investigate the high temperature rupture property of deposited metal of SUPER304H steel, the high temperature tensile test was carried out, and the microstructure transformation of deposited metal of SUPER304H steel under high temperature persistent stress were studied. Most of the solidification subgrain boundaries dissolve. The effect of the high temperature enduring on the micros...

Journal: :international journal of occupational hygiene 0
ghazal hoorfarasat msc, department of occupational health engineering, school of public health, shahid beheshti university of medical sciences, tehran, iran mohammad javad jafari phd (professor), department of occupational health engineering, school of public health, shahid beheshti university of medical sciences, tehran, iran leila omidi phd student, department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran sussan salehpour occupational medicine, masihe daneshvari hospital, shahid beheshti university of medical sciences, tehran, iran soheila khodakarim phd (assistant professor), department of epidemiology, school of public health, shahid beheshti university of medical sciences, tehran, iran naseh haydarnezhad msc, department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran

original article   the objectives of this research were to study the correlations of heat strain score index (hssi) and values of wet-bulb globe temperature (wbgt) index with physiological parameters such as core body temperature, heart rate, and blood pressure of workers exposed to heat stress in a glass manufacturing plant in order to determine the reliability of hssi. this cross sectional st...

2010
Robert E. Simpson Milos Krbal Paul J. Fons Alexander V. Kolobov Tomoya Uruga Hajime Tanida Junji Tominaga

The influence of stress on the phase change behaviour of Ge2Sb2Te5 encapsulated by ZnSSiO2 and TiN is investigated using temperature dependent Extended X-ray Asbsorption Fines Structure and Ellipsometry to determine the crystallisation temperature. The encapsulation material surrounding the Ge2Sb2Te5 has an increasingly dominant effect on the material’s ability to change phase and can cause a p...

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