Integration of English and physical education for sixth grade girls and boys.

Thesis (Ed.M.)--Boston Universit

Pressure distributions and oil-flow patterns for a swept circulation-control wing

Pressure distributions and photographs of oil flow patterns are presented for a circulation control wing. The model was an aspect ratio four semispan wing mounted on the side wall of the NASA Ames Transonic Wind Tunnel. The airfoil was a 20 percent thick ellipse, modified with circular leading and trailing edges of 4 percent radius, and had a 25.4 cm constant chord. This configuration does not represent a specific wing design, but is generic. A full span, tangetial, rearward blowing, circulation control slot was incorporated ahead of the trailing edge on the upper surface. The wing was tested at Mach numbers from 0.3 to 0.75 at sweep angle of 0 to 45 deg with internal to external pressure ratios of 1.0 to 3.0. Lift and pitching momemt coefficients were obtained from measured pressure distributions at five span stations. When the conventional corrections resulting from sweep angle are applied to the lift and moment of circulation control sections, no additional corrections are necessary to account for changes in blowing efficiency. This is demonstrated for an aft sweep angle of 45 deg. An empirical technique for estimating the downwash distribution of a swept wing was validated

A programming analysis of interregional competition and surplus capacity of American agriculture

This study is the third in a series dealing with interregional adjustments of agricultural production and land use.2 While prior studies dealt mainly with benchmark situations in 1954, the current study emphasizes interregional competition and surplus agricultural capacity estimated to exist in 1965. The emphasis is on interregional allocations of production for wheat, feed grains, cotton and soybeans and on the flow of products among consuming regions in a manner (a) to provide an optimal United States use of resources and (b) to mesh production exactly with consumption and export requirements. The analysis is made by several linear-programming models and solutions which include up to 962 equations and 2,682 real variables. Studies dealing with the interregional adjustment of agricultural production are needed for several reasons. An important need is a better assessment of the nation\u27s surplus producing capacity in order that long-run solutions might be provided for output, price and income problems. Long-run solutions generally would require adjustment of agriculture in line with the comparative advantage of the many individual producing regions. Some regions would remain in production of cotton, wheat, feed grains and soybeans (the crops included in this study); other regions would need to shift to less intensive uses, such as grazing and forestry. Research is needed to identify regions that might be expected to orient their resources in each of these directions. Educational, capital and income policies might then be directed accordingly

Making Agriculture More Efficient

Study shows changes in the location of feed grain and wheat acres if our goal was to produce the total national requirement of feed grain and wheat at the minimum national cost

The 1961 Feed-Grain Program - Who Took Part?

The voluntary feed-grain program was an attempt to halt the build-up of surplus feed grains. Interviews with farmers in 12 Iowa counties reveal traits of farm operators who did and did not take part in the program

Regional Impact of Retiring Whole Farms

Suppose the government adopted a program of returing marginal land on a whole farm basis. What would happen to the Corn Belt in 1965 if the major goal were to balance supply demand? Where would the nation stand in 1975

Milk production functions, hay/grain substitution rates and economic optima in dairy cow rations

Interest in possibilities of forage-grain substitution in the dairy cow ration has been increased by recent agricultural developments. One development is acreage control which allows farmers to grow forage as a replacement crop for grain. Another is the continuing interest in conservation: Erosion control plans ordinarily require an increased acreage of grasses and legumes and fewer acres of grains and row crops. Both of these developments increase the supply of forages relative to grains and give rise to questions of using forage profitably. One possibility is the substitution of forage for grain in rations of ruminants. The feasibility of this adjustment depends, however, on the rate at which the various classes of feeds substitute for each other. Recent changes in price structures, with dairy product prices depressed relative to feed and labor costs, also have caused farmers to examine substitution possibilities as a means of lowering costs and increasing profits. Then, too, yearly and geographic differentials in the costs of concentrates relative to forages and to the price of milk give rise to questions of the most profitable ration under particular economic circumstances. To what extent should the grain-forage ration be varied as the price of grain changes relative to the price of forage at particular locations? To what extent should the most profitable ration differ between grain surplus and grain deficit areas or other areas where concentrates are priced at different levels? These questions can be answered only if information is available on substitution ratios. The optimum ration, in terms of profit maximization, can be determined only by relating substitution ratios to price ratios. Finally, determining the nature of the milk production surface with its expression of feed/milk transformation ratios and feed substitution coefficients is a central problem in dairy cow nutrition

What Approach to Watershed Management?

A study of one Iowa watershed by USDA and Iowa State University economists points up the need for examining alternative methods for watershed management in controlling soil erosion and damage-producing runoff