منابع مشابه
Progress since the Earth Summit
The Pacific was well represented at the Summit by over 100 delegates, including nine heads of government. The preceding 18 months of preparation involved a considerable commitment and investment by the region and its partners in sustainable development (Miles 1992). Now, 18 months down the track, it is necessary to ask how this level of international attention and political commitment is affect...
متن کاملProgress in Infrared Photodetectors Since 2000
The first decade of the 21st-century has seen a rapid development in infrared photodetector technology. At the end of the last millennium there were two dominant IR systems, InSb- and HgCdTe-based detectors, which were well developed and available in commercial systems. While these two systems saw improvements over the last twelve years, their change has not nearly been as marked as that of the...
متن کامل21 Progress in Renormalization Theory Since 1949
Julian Schwinger has given us a brilliant exposition of the renormalization ideas associated with his, Tomonaga's and Dyson's names. My task is to take the story up from the exciting days of 1949 to the present. As Schwinger has reminded us, even though renormalization and infinities are logically distinct, it was the persistent infinities encountered in field theories which brought the necessi...
متن کاملTrends and seasonal cycles in the isotopic composition of nitrous oxide since 1940
The atmospheric nitrous oxide mixing ratio has increased by 20% since 1750 (ref. 1). Given that nitrous oxide is both a long-lived greenhouse gas2 and a stratospheric ozonedepleting substance3, this increase is of global concern. However, the magnitude and geographic distribution of nitrous oxide sources, and how they have changed over time, is uncertain4,5. A key unknown is the influence of th...
متن کاملDivergent Paths: a New Perspective on Earnings Differences between Black and White Men since 1940
We present new evidence on the evolution of black-white earnings differences among all men, including both workers and nonworkers. We study two measures: (i) the level earnings gap the racial earnings difference at a given quantile; and (ii) the earnings rank gap the difference between a black man’s percentile in the black earnings distribution and the position he would hold in the white earnin...
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ژورنال
عنوان ژورنال: British Journal of Anaesthesia
سال: 1973
ISSN: 0007-0912
DOI: 10.1093/bja/45.12.1227