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Factors Influencing Population Growth Of Tribolium Brevicornis In The Laboratory, Amin Gulla

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

To determine the effect of the factors of the environment (temperature, relative humidity, and food) on the population growth of Tribolium brevicornis, different levels of temperatures from 17.5°C - 37.5°C were used. Effect of these IeveIs of temperatures was tested upon both pre-embryonic and post-embryonic development. No hatching occurred at 17.5°C, but the threshold temperature (the minimum temperature for the development) was just before 17.5°C. The optimum temperature for the embryonic development was found to be between 32.5°C - 35°C.

With the use of the saturated salt solution according to Buxton (1931) and Buxton and Melanby (1934), certain humidity …

A Study Of Factors Affecting The Germination Of Alfalfa And Safflower Pollen, Ling Lin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Pollen grains serve a very important role in the life cycle of flowering plants, in that they are involved in the transmission of inherited characteristics from generation to generation. Because of their small size the study of pollen grains has been necessarily associated with the development of the microscope. Not until the middle of the seventeenth century, when Hooke gave the world the compound microscope, was an instrument available with sufficient power to adequately reveal the shapes of pollen grains. However, two of Hooke's contemporaries, Malpighi and Grew, who used a simple microscope, are generally recognized as the co-founders of …

The Interaction Between Water Movement, Solute Uptake, And Respirational Energy In Plant Roots, Mohamed Sadek Tawakol

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Sunflower plants (Helianthus annus, var. Russian mammoth) were grown in Hogland nutrient solution. The roots (after being subjected to treatments with either respiratory inhibitors or respiratory stimulators) were used to measure the flux of water J_w, flux of solute J_s , and the rate of respiration Jo.

The thermodynamic theory of irreversible processes was used to examine the interaction between fluxes, and the changes in conductivity under different treatments. The rate equations for a root membrane of unit thickness were developed as:

J_w = L_wwV_w∆p + L_wsRT ln …

The Influence Of Thermo-Gradients Upon Water Movement And Retention In Unsaturated Soils, Jose V. Salazar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Temperature differences of about 5, 10, and 15 V, were applied to uniformly packed and insulated horizontal column of Millville silt loam soil using mean temperatures near 13, 14, 15, 16, 17, 18, 19, 20 and 23.5 C. The temperature distribution along the soil column was determined using copper constantan thermocouples. Soil samples were taken to determine volumetric moisture content, and soil water potential, using the vapor pressure psychometer technique. The thermodynamic flow equation of Taylor and Cary, (1964) was used to calculate the hydro-thermal transfer coefficient (ß) as given by:

-ß = d(μ_w)_T / dlnT

where …

Adolescent Attitudes Toward The Employment Of Women, Ann Leigh Adams

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The past twenty-five years has brought about a substantial increase in the number of American women participating in the labor force. In 1940, approximately 12.8 million women were involved in employment outside the home; this was 25 percent of the total female population 14 years of age and over. By 1964, the number of employed women had doubled; there were then 25.8 million women workers. Out-of-the-home employment was actively engaging 37 percent of American women (7, p. 301). However, not only has there been an increase in the number of workers; there are also changes in the percent of women …

The Content Of Preschool Children's Original Stories, Danae Elaine Dana

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The early years of childhood are characterized by new ideas; experimentation; the building of relationships; fears, both real and imagined; and play, through which the child tries to assemble these experiences into a meaningful whole. The early years are an exciting, complex and vibrant time of learning while the child grows in his understanding of himself and the world around him.

A Study Of Adolescents' Reactions To Temporary Absences From Home In A Crisis Situation, Imogene Ward Christensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study is a description of the reactions of adolescents, who had opportunities for independence and growth toward maturity as a result of a crisis situation.

Special consideration is given to (a) the variety of heroic and realistic experiences had during the flood; (b) personal and social adjustments in the unique setting of dormitory living (separated from families); and (c) the academic achievements in the emergency learning situation.

Streaming Current And Streaming Potential Induced By Water Flow Through Porous Media, Mohamed M. I. Abaza

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was conducted to investigate analytically and experimentally the relationship between the rate of flow of water through porous material and the streaming current and streaming potential induced by this flow. The effect of dissolved salts in the permeating solution and the size of the soil particles was also investigated.

Results and conclusions of this study are summarized as follows:

1. A modified procedure using the appropriate delay to insure stead state conditions was used for the measurements of both streaming current and streaming potential.
2. The flow-pressure relationship was the same irrespective of the counter electro-osmosis (resulting from the streaming …

Influence Of A Male Or Female Teacher On Sex-Role Preferences Of The Pre-School Child, Mary Jane Mecham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The primary function of a nursery school is to educate children, or to provide opportunities for them to learn about their environment, their relationships, and their own selves. The most crucial part of the learning situation in the nursery school is the teacher, whose task it is to promote learning through provision of a variety of experiences by means of which children can discover themselves and begin to relate to the world and to other people.

A Study Of Amino Acid, Protein, Organic Acid And Carbohydrate Changes Occurring During Germination Of Peach Seeds, Lee Chao

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Conditions required for seed germination are different among species. Some seed of tropical and subtropical plants may germinate before the maturation of their fleshy fruit, e.g. papaya species, while seed from most deciduous trees have a period of after-ripening before germination. The after-ripening period, also referred to as rest or dormancy has also been observed in some vegetable crops and ornamental flowers.

The Impact Of Research And Development On Income And Employment In Utah, Thomas Clark Anderson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research and development (R&D) play an increasingly important role in the economy of the United States. Total expenditures for R&D during the decade of the 1950's were greater than in the entire history of the United States previous to that time. As a percent of gross national product, R&D has grown from 0.2 percent in 1921, to 0.4 to 0.6 percent in the 1930's and 1940's, and is now more than 3 percent.¹

Much has been said of the impact that the growth of R&D has on the general economy. R&D had also had a significant economic and sociocultural …

A Study Of The Extent To Which Further Consolidation Is Feasible And Desirable Within Selected County School Districts In Utah, Walter D. Talbot

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Under the mandator consolidation act of 1915, the county-unit school district in Utah had its beginning (10). Although, through this consolidation movement, many small school districts were combined into larger ones, the elimination of the small districts did not, necessarily, provide for the elimination of the small schools. Due to several factors including distance, poor communication and transportation facilities, and a strong desire on the part of the people who lived in small communities for a voice in school matters, the consolidation of school attendance areas did not keep pace with school district reorganization.

With the improvement of highways and …

The Effect Of Protective Materials On The Overwintering Of Hardy Annuals, Candytuft And Stocks, Melvin S. Burningham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many hardy annual flowers will live through the winter if there is sufficient snow protection. Since snow cover is not consistent from year to year it has been suggested that hardy annuals planted in late summer and provided with some kind of protection before severe freezing begins will live through the winter successfully. Not only would this enable plants to bloom four to six weeks earlier, but would also enable gardeners to utilize flowers not commonly grown in northern Utah.

Some studies conducted at the Utah Experiment Station in Farmington have indicated that plants such as candytuft and snapdragons can …

Nitrification In Three Different Soils In Polyethylene Bags In The Field Overwinter, William R. Olmstead

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nitrification, the process whereby ammonical-nitrogen (NH₄⁺ - N) is changed into nitrate-nitrogen (NO₃^--N), is one of the more important biochemical processes associated with agriculture. Nitrate appears to be the form of N that most crops can most readily utilize.

The Comparative Costs Of Processing Frozen Sour Cherries, Utah County, Utah, 1964, Richard K. Hart

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Since 1905 when Professor Henry C. Taylor opened the area of economies of scale for discussion with his observations on the variables affecting farm size, agricultural economists have been concerned with scale of plant in agriculture. Considerable study and discussion have not resolved many of the questions raised in this area, but a basic framework has been constructed which can be used as a planning tool in the efficient organization and operation of plants of various sizes under given conditions.

A Monte Carlo Study Of Non-Linear Regression Theory, Ya-Ming Liu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Multiple regression provides the capability of using non-linear functions to fit various curvilinear surfaces. These non-linear functions are, however, linear in the parameters. Non-linear term of the variables such as X², X³, ln X, X, YX are incorporated in a linear model. For example:

Y = b₀ + b₁ x₁ + b₂ x₁² + b₃ lnx₂ + ϵ

Many practical situations require the fitting of mathematical functions which are non-linear in the parameters and perhaps the variables. For example:

Y = b, e^b₂X + ϵ

Gonadotropic Hormone Activity In Blood And Placental Tissue Of The Bovine Early In Gestation, John E. Lunnen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Certain mammalian species have been shown to secrete extra-pituitary gonadotropins. In humans the chorionic cells of the placenta secrete a gonadotropin and in pregnant mares such a hormone is secreted by the endometrial cups. Gonadotropins of placental origin have also been observed in the rat.

A Density For A Generalized Likelihood-Ratio Test When The Sample Size Is A Random Varible, Raymond H. Neville

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many articles, books, papers, and abstracts have been published, which describe the analysis and design of experiments. R. A. Fisher's (1951) book, The Design of Experiments, is referred to by D. J. Finney (1960) as the classic for experimental designs. Some of the more outstanding books and publications in this area are those by Cochran and Cox (1957), Cox (1958), Davis et al., (1954), Federer (1955). Quenouille (1953). and Kempthorne (1952).

Probable Circular Error (Cep) Of Ballistic Missiles, James Edward Moran Jr.

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The survival of our nation, during a nuclear exchange, depends upon an effective national defense structure. The prime weapon system in this defense structure is the ballistic missile. Although many factors enter into an evaluation of the effectiveness of a ballistic missile, one of the most important measure is accuracy. Without an accurate weapon system we have no weapon system.

The Department of Defense has places emphasis on using a method of accuracy evaluation called "Probably Circular Error (CEP)." Probably Circular Error is defined as "The radius of a circle, centered at the intended target, within which 50% of the …

A Logistic System Simulation Model Encompassing Poisson Processes And Normal Or Weibull Life, Willard A. Hansen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis describes a computer simulation model for determining effective spares stock levels for recoverable items at Air Force bases and depots. The simulation model is based on the following fundamental inventory theory; whenever a demand arises, it is satisfied from stock on hand, and the quantity equal to that demand is recorded immediately; when a demand exceeds stock on hand, the excess demand is backordered immediately and when item life expires procurement action is initiated at depot level. The resulting product of the model cam be used as a guide for the optimum distribution of available spares or as …

Review Of Reliability Techniques, Eugene Richard Doherty

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In the development of any product to perform a specific function the first concern of the engineer is to design for satisfactory operation. Engineers originally approached the reliability problem by using excessive safety factors to be assured the structure or material would withstand the calculated loads and stresses. The engineer also learned from operating or testing the equipment until failures occurred and then redesigning as mistakes became apparent. These methods were time consuming and often resulted in bulky over designed products. These approaches became impractical with the advent of new technological advancements. The accelerated industrial development of aircraft, missiles, and …

A Study Of The Extent Of Extramural Competition For Girls In The High Schools Of Utah, Betty Ann Dance

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Physical education is included as a part of the curriculum in most secondary schools throughout the United States. Since it is usually required for at least one year, and possibly more in some schools, it is important to design the program properly. A well-rounded physical education program is established to include three phases: the instructional phase, the intramural phase, and the extramural phase.

The Identification Of Basic Problems Found In The Bassoon Parts Of A Selected Group Of Band Compositions, J. Wayne Johnson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Since the early sixteenth century, the bassoon has played a role of varying importance in musical organizations. Early groups used as many as twenty-four bassoons in conjunction with other instruments. Today, it is common to have no more than two or three bassoons in bands and orchestras because other instruments, as they developed, have replaced the bassoon in the instrumentation of such groups. Although the bassoon is not as important numerically as it formerly was, its place in musical organizations is assured because it has expressive colors and tonal qualities which cannot be duplicated by any other instrument. The bassoon …

The Dynamics Of Duopoly, Gordon E. Johnson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A monopolist, knowing the demand curve for his product, can in a given period produce the quantity of this product which will maximize his profit. Any larger or smaller quantity will result in less profit. When another manufacturer starts producing the same or similar product, a duopoly result. The new manufacturer, in order to maximize his profit, according to Cournot, will choose a quantity that is derived on the assumption that the original manufacturer's quantity will remain fixed.

Simultaneous Movement Of Water And Herbicides In Unsaturated Soils, Ming-Shyong Yang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Since weed killers were developed in the early part of the decade beginning in 1940, herbicides have been increasing in use until they are now widely used to control weeds. The application of herbicides has thus become a regular agricultural and ecological practice.

Transfer Restrictions And Misallocation Of Irrigation Water, Herbert H. Fullerton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Water is among the most abundant of all materials known to man. In all its various forms, water covers 75 percent of the earth's surface. It is estimated that the total physical quantity of water on the earth is 326,000,000 cubic miles. This apparent abundance belies the true nature of the water resource as it relates to the needs of man. At any given point in time, only a rather minute portion of this vast quantity of water is found in those forms and locations which render it useful to man. This may be attributed to the fact that utility …

Simultaneous Flow Of Heat And Water In Plant Tissue, Gaylon Sanford Campbell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Although biological phenomena may be partially described in a general way without the use of mathematics and physics, the experimental results may be more meaningful if they are analyzed on the basis of physical and mathematical laws. The complexity of biological systems has made the application to them of mathematics and physics rather difficult, and only recently has much progress been made. Although it has yet been possible to describe only a few simple biological systems by actual equations, a great deal of qualitative information may be obtained by applying physics and mathematics. Russell (1960, p. 439) said

In principle …

Behavior Patterns Of The Adult Alfalfa Weevil In Cache Valley, Utah, J. Wanless Southwick

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The alfalfa weevil, Hypera postica (Gyllenhal), was first found in the United States in Salt Lake City, Utah, during 1904 (Titus, 1910b). It spread form this point of original introduction and partially infested Cache Valley by 1912 (Titus, 1913).

The Economic Value Of Forage For Livestock On Public And Private Ranges In Utah, Mardell D. Topham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The United States Government controls about 359 million acres of land in the 11 Western States. This vast acreage produces recreation for vacationers, timber for lumbermen, water for city and rural consumption, forage for livestock and wildlife, and minerals for miners. In many cases, the users of these products are competing and are clamoring for a large share of this land. Consequently, land use is continually changing. Since 1941, the amount of timber cut has tripled, recreation has doubled, watersheds now yield a better quality of water (Clawson, 1957), forage for wildlife has increased but forage for livestock use has …

An Ecological Study Of Ditylenchus Dipsaci (Kuhn) Filipjev. In A Field Of Alfalfa, Shu-Ten Tseng

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ditylenchus dipsaci (Kuhn) Filipjev. is one of the most destructive nematodes to crop plants. It attacks and damages more than 300 species of cultivated and uncultivated plants. The nematode can be differentiated into many races, each of them having a preference for a group or even a single plant species.

Alfalfa stem nematode is one of the races in this species which attacks the above ground portion of alfalfa but does not infest the roots. Larvae of this nematode may migrate from the plant tissue to soil in moist conditions. These nematodes migrate actively to nearby plants or are carried …