Results 211 to 220 of about 870,325 (246)
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2001
Environmental stress is an action, agent, or condition that impairs the structure or function of a biological system. This environmental stress can be natural, like hurricanes, droughts, floods and fires for example, or anthropogenic, meaning resulting from human actions._ Both natural and anthropogenic environmental stresses can be characterized based
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Environmental stress is an action, agent, or condition that impairs the structure or function of a biological system. This environmental stress can be natural, like hurricanes, droughts, floods and fires for example, or anthropogenic, meaning resulting from human actions._ Both natural and anthropogenic environmental stresses can be characterized based
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AT&T Technical Journal, 1994
Environmental stress testing (EST) is a means of systematically improving the reliability of electronic systems. In this paper, we discuss: — The background and rationale for EST; — The utility of accelerated testing to achieve robust design margins, high component quality, and well-controlled manufacturing processes; — Various issues that must be ...
H. Anthony Chan +3 more
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Environmental stress testing (EST) is a means of systematically improving the reliability of electronic systems. In this paper, we discuss: — The background and rationale for EST; — The utility of accelerated testing to achieve robust design margins, high component quality, and well-controlled manufacturing processes; — Various issues that must be ...
H. Anthony Chan +3 more
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2022
AbstractWhile there are many fracture mechanisms that can lead to the failure of a plastic component, environmental stress cracking (ESC) is recognized as one of the leading causes of plastic failure. This article focuses on unpacking the basic concepts of ESC to provide the engineer with a better understanding of how to evaluate and prevent it.
Javier C. Cruz, Jeffrey A. Jansen
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AbstractWhile there are many fracture mechanisms that can lead to the failure of a plastic component, environmental stress cracking (ESC) is recognized as one of the leading causes of plastic failure. This article focuses on unpacking the basic concepts of ESC to provide the engineer with a better understanding of how to evaluate and prevent it.
Javier C. Cruz, Jeffrey A. Jansen
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Environmental pollution stress
1994Plants are polluted, prevent pollution and pollute. This statement summarizes modes of interaction of plants with environmental stress, but the focus of this chapter will be on the effects of environmental pollution on plants. This type of pollution can be grouped into two categories: xenobiotic and biotic pollution.
Bryan D. Mckersie, Ya’acov Y. Leshem
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2003
In chapters 2 to 4 we discussed several models of extinction which make use of ideas drawn from the study of critical phenomena. The primary impetus for this approach was the observation of apparent power-law distributions in a variety of statistics drawn from the fossil record, as discussed in section 1.2; in other branches of science such power laws ...
M. E. J. Newman, R. G. Palmer
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In chapters 2 to 4 we discussed several models of extinction which make use of ideas drawn from the study of critical phenomena. The primary impetus for this approach was the observation of apparent power-law distributions in a variety of statistics drawn from the fossil record, as discussed in section 1.2; in other branches of science such power laws ...
M. E. J. Newman, R. G. Palmer
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Oxidative stress from environmental exposures
Current Opinion in Toxicology, 2018Oxidative stress is arguably the most common mechanism in the toxicology of environmental agents, unifying the action of broad classes of physichochemically disparate environmental pollutants, including oxidant gases, organic compounds, particulate surfaces, and metal ions.
James M, Samet, Phillip A, Wages
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Plant responses to environmental stress
Current Opinion in Biotechnology, 1992Considerable progress is being made in identifying genes that are important for tolerance to abiotic stress and in defining stress-responsive gene promoters and signal-transduction pathways. Although genetically engineered crop plants with greater resistance to environmental stress have not yet been produced, research is at a turning point where ...
E, Vierling, J A, Kimpel
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2003
Abstract This article discusses the molecular mechanism, environmental criteria, and material optimization of environmental stress crazing (ESC) in glassy thermoplastics, polyethylenes, and nylons. In addition, it provides information on various tests used to determine relative susceptibility to ESC, namely constant tensile load testing ...
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Abstract This article discusses the molecular mechanism, environmental criteria, and material optimization of environmental stress crazing (ESC) in glassy thermoplastics, polyethylenes, and nylons. In addition, it provides information on various tests used to determine relative susceptibility to ESC, namely constant tensile load testing ...
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Coral lipids and environmental stress
Environmental Monitoring and Assessment, 1993Environmental monitoring of coral reefs is presently limited by difficulties in recognising coral stress, other than by monitoring coral mortality over time. A recent report described an experiment demonstrating that a measured lipid index declined in shaded corals.
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