منابع مشابه
Brittleness revisited
The concept of brittleness plays a crucial role in the development of tight oil and gas as it reflects a rock’s ability to fail and maintain a fracture in a hydraulic fracture experiment. Conventional methods that attempt to quantify the degree of brittleness associated with a rock mass have a few shortcomings. For example, failure criteria are not used and only the effective moduli are conside...
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IN 1991 an editorial in the Journal reported a new initiative on depression supported by the Royal College of Psychiatists and the Royal College of General Practitioners.1 This defeat depression campaign aimed to raise the medical profession's awareness of the illness and to embark on an ambitious project to educate the general public. The vast majority of people with depression present to thei...
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A dramatic example of the 'arms race' between hosts and pathogens has been observed in the response of mice to the parasite that causes toxoplasmosis.
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Incompatible goals among multiple agents working on domains involving finite constraints can be a source of conflict. This conflict, in the form of incompatible constraints established locally by the agents and imposed on the negotiated variables, may break the dialogue between these agents even though they could, in principle, reach an agreement. A common means of coordinating multi-agent syst...
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Carbon dioxide emissions have accelerated since the signing of the Kyoto Protocol. This discouraging development may partly be blamed on accelerating world growth and on lags in policy instruments. However, it also raises serious question concerning whether policies to reduce CO2 emissions are as effective as generally assumed. In recent years, a considerable number of studies have identified v...
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ژورنال
عنوان ژورنال: Nature
سال: 1988
ISSN: 0028-0836,1476-4687
DOI: 10.1038/332112a0