Education and national development
It is suggested in this paper that educators give serious thought to boarding schools to help reduce the cumulative achievement deficit between most middle and lower class children in the United States. The author recalls his own experience with boarding schools in Nigeria, reviews the ineffectiveness of compensatory education in America, and summarizes the history of residential schooling in Europe and North America. It is pointed out that many of the privileged in this society have long enjoyed the alternative of boarding schools while the only residential institutions available to most of the poor are the armed forces and the puoiit j~ils.
Some Social Aspects of Brazilian Education
States. In the United States 91 per cent of the generation who have entered the first elementary grade reach the first junior high school grade after six years, while in Brazil the figure is only I2 per cent. Thirty-two per cent of the North Americans and only I per cent of the Brazillians enter college.2 When Brazil became an independent nation and was organized into an empire, she tried many times to organize a system of schools for the common people. Nevertheless she failed, and had to fail: Education had no meaning for a people who were kept in obscurantism and illiteracy during the three centuries of submission to Portugal as a colony. Moreover, the national socioeconomic structure, based mainly on slavery, monoculture, and latifundium, did not require school education as a condition of improving productivity and living standards.
Experimental Study on Acoustic Agglomeration of Fine Particles from Coal Combustion
The removal of fine particles in coal-fired fumes was experimentally studied based on acoustic agglomeration. An experiment facility was designed and set up. In this facility, a fluidized bed coal combustor was used as fume generator, and an Electrical Low Pressure Impact or (ELPI) was used to measure the fine particle concentration and size distribution in the fumes. The results show that under the effect of high intensity sound waves, there is good performance to remove fine particles in coal-fired fumes, which with a number mean diameter of 0.07μm. Especially, under the conditions of the frequency of 1 000Hz and the sound intensity of 161.5dB, the number concentration of 0.0233~9.314μm particles decreased by 85.2%, and their mass concentration decreased by 92.5%.