The purpose of this study was to compile a table of the reported magnesium contents of 100 gram portions of commonly used foods and to calculate the magnesium content in the certain experimental diets given to 12 preadolescent girls during 53 days in the summer of 1958, The subjects were six and one-half to nine years of age. Each subject was of normal math and weight for their height and age. The diets were adequate in all nutrients as recommended by the National Research Council (34) except for the nitrogen intake which averaged 3.46 grams daily for five six-day periods, and 2.83 grams for the following three six-day periods. / Master of Science

This study, conducted at Camp Pickett, Virginia, attempted to evaluate several rabbit management practices currently in use on this deactivated military reservation. The methods being applied by the Virginia Come mission of Game and Inland Fisheries consist of establishment of wildlife food plots, the seeding of fire lanes and mowing and burning as a means of retarding ecological succession. Results of these evaluations indicated that the annual mixture plot is the type most heavily utilized by rabbits during the fall. Next in importance was the clover-winter grain combination planting. These conclusions were determined by means of live trapping and these trapping data were substantiated by pellet counts. A total of 211 rabbits were handled in this phase of the study; 135 were marked and 76 were recaptured. Of the 135 animals marked, 40.8 per cent were marked in the annual mix plots. This trapping demonstrated a sex ratio of 130 males to 100 females and an immature to adult female ratio of 2.3:1. A relationship between trapping success and temperature seemed to exist; a coefficient of correlation of -0.273 was calculated. A vegetative inventory inferred that both mowing and burning may be desirable rabbit management practices. An attempt was made to test three population estimation formulae on a known, enclosed rabbit population. Results of trapping within the five acre enclosure gave a comparable population estimate fer the Lincoln index, the Krumholz formula and the Schumacher-Eschmeyer formula. This experiment was not carried to the refined point of supplying definite conclusions; further investigation is necessary before concrete recommendations may be made. Records of the hunting season harvest were maintained. When these kill figures were combined with a rough estimate of the rabbit population on Camp Pickett, it was indicated that approximately 26 per cent of the cottontails were harvested. Hunting kill records maintained by the Game Commission over the past three years show a marked increase in hunter success, probably due te the effects of management. All bot fly parasitism cases were noted; 155 infestations were observed among the 325 rabbits handled. The larvae demonstrated no preference as to sex of the host but immature cottontails were more heavily parasitized than were adults, Records of tularemia incidence throughout Virginia have been maintained. Two areas of greater incidence occur; however, the Camp Pickett area appears to be average for the state. Cost comparisons were made between annual mix plots and clover-winter grain plots. The annual mix type of food plot cost an estimated $7.30 per half acre te install; the clover plot cost $18.09 per half acre. Which type plot, annual or perennial, is used depends upon the budget and Labor available. The writer favors use of the clover plots for rabbits both from the economical and biological points of view. / Master of Science

A circular thin plate under radial compressive forces resting on an elastic foundation not in attachment was studied with regard to it's behavior in the 2nd mode shape. Two regions of action are controlled by two differential equations of the fourth order which were solved in terms of the Bessel functions. The relations between the foundation modulus and the buckling load were found from two characteristic equations expressed in terms of Bessel functions. / Master of Science

The thesis is concerned with the design of an apparatus to determine the film coefficients for the conditions of forced convention, local boiling of sub-cooled water and the two phase flow of water-steam mixtures. Inasmuch as the agitating action of the bubbles during boiling of liquid permits high rate of heat transfer, information concerning convective heat transfer under conditions of local boiling and the two phase flow is of importance to the development of high heat flux heat exchangers which incorporate a phase change of coolant. The variation of the film coefficient with water temperature, flow rate, heat input rate, and fluid pressure may be investigated with this apparatus. The range of variables is Heat flux: 2.5 x 10⁵ to 5 x 10⁵ B/hr ft² Inlet temperature: 100 to 300°F Mass velocity: 0.52 x 10⁶ to 1.7 x 10⁶ 1b/hr ft² Pressure: Up to 200 psia The basic scheme of this apparatus is to pump deionized water through an electrically heard test section which is a stainless steel tub, 0.465 in O. D. x 0.020 in. thickness x 5ft length, where the fluid temperature, surface temperature and fluid pressure are measured by thermocouples and pressure gages. The electrical power to the test section is supplied by a welding transformed. Pressurization of the system is accomplished by throttling the flow at the discharge end of the test section through the exhaust valves. The fluid leaving the test section is condensed and sub-cooled by a vertical vapor-in-tube type heat exchanger so that the fluid can be recirculated again. An auxiliary ion-exchanger system is provided for deionization of the test water so that the deposition of scale on the heating surface can be prevented. With the above apparatus, local clause of fluid temperature, surface temperature and heat flux may be obtained and consequently a “point” determination of the film coefficient is possible. / M.S.

The problem considered in this study arose from the need for an emperlcal analysis of the sale value of land to determine if the increased price benefits of the governmental flue-cured tobacco program have been absorbed by higher land rents. If acreage allotments giving the right to produce tobacco under the program are capitalized into farmland values to an appreciable extent, the program objective of increasing farm incomes would be partially defeated through higher rents. The objective of this study was to determine the extent to which allotments have been capitalized into land values. Data on sale value of farms and factors expected to influence the farm sale value were secured from primary public record sources for the four-year period from 1954 to 1957 in two distinctly different flue-cured tobacco regions--Pittsylvania County, Virginia, and Wilson, Greene, and Pitt Counties, North Carolina. These data were analyzed by a multiple regression statistical technique designed to measure the value of an acre of tobacco allotment es a right to produce. The statistical coefficients indicated that an acre of tobacco allotment increased in value from $962 in 1954 to $1,673 in 1957 for Pittsylvania County and from $1,830 to $3,308 for Wilson, Greene, and Pitt Counties. The size of the values for an acre of tobacco allotment as well as the increase in values over the four-year period during which allotments were reduced under the program by 33 percent indicate that an appreciable proportion of the price·rais1ng benefits of the program have been capitalized into land values. / Master of Science

This investigation is a study of adjustment and home management practices of two groups of homemakers, those with and without the economics education in high school. The two groups were compared for (1) home management practices, (2) adjustment of homemaker and husband, and (3) homemaking adequacy as reflected in certain practices. Subjects used were 31 young married homemakers living in Richmond, Virginia, all graduates of Richmond High Schools in 1949-50, none of whom attended college. Subjects were divided into two groups; Group I , 18 homemakers who studied home economics in high school; Group II, includes 13 homemakers without home economics training. The data, collected during 1958 through the interview method, include (1) interests, problems and attitudes of homemakers , (2) personality inventories, and (3) husband’s opinion of wife as a homemaker. The two groups were similar in age, number of children, leisure time, social activities and home relations. Household activities and husbands opinion of his wife as a homemaker of subjects in Group I were rated superior to those in Group Il. Group I subjects felt that a wider range of subject matter in their high school home economics courses would have been beneficial. Group I subjects considered 13 of 42 problem items used to be problems significantly more often than subjects in Group II. In 10 of 25 possible interest items listed, Group I homemakers expressed a significantly high interest. Significantly better scores were received by Group I subjects than by Group II subjects on the Johnson Temperament Analysis for four traits, and by Group II on two traits. Husbands temperament scores were similar to their wives. / Master of Science

The Problem.- To determine occupations entered by Agricultural Education graduates of Virginia Polytechnic Institute from 1948 through 1958, their financial advancement, and relationship of undergraduate success to success, after graduation. Purposes.- To determine fields of employment, beginning salaries, number who have changed jobs, reasons for job changes, educational advancements, relationship of quality credit average and co-curricular activities to occupational choices and advancement, and curriculum changes graduates thought desirable. Method.- Study was based on student records and on objective questionnaire which was mailed to each of the 333 living individuals to secure additional data. Returns were received from 272 (81.7 percent) of the graduates. Findings.- The 236 Bachelor's degree graduates entered 24 different occupations immediately after graduation, but in 1958 they were employed in 50 different occupations. Beginning salaries for all occupations averaged $3,211, while the 1958 salaries averaged $5,235. Salaries averaged $3,076 for 144 beginning teachers of vocational agriculture. In 1958, 82 teachers of vocational agriculture received salaries averaging $4,643. One hundred and ninety (69.9 percent) graduates changed jobs one or more times since graduation. Better opportunity to advance and to obtain a higher salary were the major reasons for not teaching vocational agriculture and for leaving the profession. Less than 15.0 percent of the graduates earned advanced degrees. There was no definite relationship between quality credit averages or participation in co-curricular activities and fields of employment, but an apparent relationship existed between these factors and success and advancement. Six areas of increased course offerings were suggested. / Master of Science

Records of 176 Hampshire pigs, consisting of 118 barrows and 58 gilts, were used in this study. The least squares method was applied to estimate the effect of rate of gain during four periods of growth (birth to 50 pounds, 50 to 100 pounds, 100 to 150 pounds, and 150 to 200 pounds) on carcass characteristics. The results were expressed as partial regression coefficients in terms of square inches or inches per pound for deviation in growth rate. The loin eye area and the average back fat thickness had a consistent, but not statistically significant association with the live weight groupings as arbitrarily designation. The carcass length was inconsistently and statistically nonsignificantly related to the live weight. Sex of the animal did effect the carcass in that gilts had leaner carcasses than barrows as shown by larger loin eye areas and thinner back fat. When the average daily gain increased one pound during 100 to 150 pound growing period, the loin eye area was 0.40 square inches larger at a slaughter weight of 200 pounds. When the average daily gain increased one pound during the suckling period, the average back fat was 0.25 inches thinner at 200 pounds. As the daily gain increased one pound during the second growing period, the average back fat was 0.15 inches thicker in the finished pigs. The growth rate had a statistically nonsignificant effect on the carcass length during any period of growth. The growth rate during period other than those shown had no effect on the carcass characteristics measured in this study. / Master of Science

The purpose of this thesis is to investigate three aspects of Chinese industrialization: first, what are the causes of the slow growth of Chinese industries; second, what Chinese industrialization has been done by the Ching dynasty before 1912, and by National China after 1912; third, from the analysis of natural resources, from the view of past achievement in the Chinese industrialization, what will be the possibilities of Chinese industrialization in the future. The investigation and analysis are concerned with the following: 1. The basic factors for industrialization. 2. The general causes of slow growth of Chinese industrialization. 3. General growth of Chinese industries. 4. Development in particular industries: a. Steel and Iron industries. b. Coal industries. c. Electric industries. d. Textile industries. e. Machine and petroleum industries. The conclusion of this study is to show a sound policy for Chinese industrialization for the future. / M.S.

No description available.