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101.
Adams Edwin P. 《Journal of The Franklin Institute》1927,204(4):469-486
(I) Evidence has been given that the so-called permanent electrets of Eguchi are not permanent, but that their polarization decays with the time. At room temperatures this decay is too slow to be observed directly; but it is the decay of the polarization that, at least in part, accounts for the presence of the free charges that are always observed. At higher temperatures the results that have been obtained are consistent with the view that the rate of decay of the polarization increases very rapidly with the temperature; so much so that the polarization may be almost completely destroyed at a temperature which is not high enough to cause any appreciable softening of the waxes that form the substance of the electrets.(2) As is to be expected from Lord Kelvin's hypothesis as to the cause of pyro-electricity, these electrets have been shown to possess the pyro-electric property.(3) The piezo-electric effect, which always accompanies the pyro-electric property, has been shown to be exhibited by these electrets. 相似文献
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John Adams 《International Journal of Educational Development》1981,1(2):67-68
This paper is an attempt to describe the nature and scope of educational provision in Tanzania since 1967. It focusses on the implications of educational policy for the development of manpower which would be suited to the satisfaction of basic needs in rural areas.Tanzania since 1967 is reportedly attempting to implement what amounts to a basic needs strategy of development in line with the declared socialist objectives of the Government.This strategy is essentially a mixture of poverty and employment oriented strategies directed at satisfying essential human needs in areas such as health, education, safe water, housing and sanitation, and food supply as well as other requirements for a fully productive life.Although the provision of education is itself a basic need, it is also a vehicle for the production of trained manpower which is essential to the effective implementation of the basic needs strategy in the other sectors mentioned above. This paper presents preliminary and tentative impressions of the relevance of Tanzania's educational system to the Government's objective of meeting the basic needs of its people as soon as possible.The paper is divided into four sections: educational philosophy in Tanzania, educational growth and development, manpower implications and theoretical models explaining the development of educational resources in Tanzania since 1967.It concludes that, where planning has preceded political decisions, large measures of success have been achieved, but that, overall, political expediency and haste have created substantial divergences between policy and practice. 相似文献