نتایج جستجو برای: 1980s
تعداد نتایج: 19132 فیلتر نتایج به سال:
Despite evidence from a number of Earth systems that abrupt temporal changes known as regime shifts are important, their nature, scale and mechanisms remain poorly documented and understood. Applying principal component analysis, change-point analysis and a sequential t-test analysis of regime shifts to 72 time series, we confirm that the 1980s regime shift represented a major change in the Ear...
In a climate of increasing concern about the high incidence of coronary heart disease in South Africa, calls are increasingly being made for South Africans to alter their diet. Can this exhortation be justified, and are the right foods being singled out as culprits? If changes in the eating habits of a nation are advocated, the advice must not only be soundly based in terms of likely benefit bu...
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