This study deals with "open code dating," the movement by grocery manufacturers and distributors toward dating perishable food packages in such a manner that consumers can readily determine product freshness or length of time on store shelves. The study explores the desirability and feasibility of open code dating, placing greatest importance upon the response of the consumer to the concept. It was found that consumers were aware of open code dating and generally strongly desired its universal adoption. Shoppers were also confused by open dating and failed to understand freshness dates properly. The strongest desire for open dating was found in shoppers at the upper end of the socio-economic scale. Grocery retailers expressed satisfaction with open coding, believing it an aid in stock rotation and customer satisfaction. Possible disadvantages, such as increased throwaway costs and large conversion costs, were not perceived as being significant. The businessmen favored widespread adoption of open code dating. On the basis of data from interviews with shoppers, it is concluded that consumers desire adoption of open code dating and do use this service. It is also concluded that adoption of open code dating would be an economically sound decision which would constitute a desirable marketing …

The problem of this study was to determine the effects which the practicing of self-selected teaching skills by elementary education majors had on measures of personality and of teaching behavior. Personality measures were limited to self-confidence; attitudes toward self, children, and others; identification with the teaching role; and identification with the teaching profession. The teaching behavior measures were coded interaction episodes between a teacher trainee and four pupils in a microteaching setting. It was concluded that training experiences of short duration (e.g., eight weeks or less) (1) can be expected to positively affect specific, narrowly defined personality traits such as identification with the teaching role and identification with the teaching profession, (2) cannot be expected to affect broadly defined, global personality traits such as self-confidence or attitudes toward self, children, and others, and (3) cannot be expected to affect the classroom interaction of teachers and pupils.

This study examined the student's achievement, attitude toward science, and self-concept of ninth grade physical science students in an individualized science program and ninth grade physical science students in a traditional science class. The research was conducted to ascertain the effect of individualized instruction upon the achievement, attitude, and self-concept of inner-city junior high school science students, and to analyze the implications of these effects for administrators, teachers, counselors, and others who are interested in the optimum achievement of students to science instruction. The sample size was 150 ninth grade physical science students enrolled in an individualized science program and 150 ninth grade physical science students enrolled in a traditional program. The students were administered the Stanford Achievement Test: Science, Remmer's Attitude Toward Any School Subject Scale, and the Piers-Harris Children's Self-Concept Scale. The experimental design of the study was patterned after the posttest only control group design. Preliminary data were obtained for each student within each participating class. The preliminary data were used for establishing group equivalence and as a concomitant observation in the analysis of covariance. The preliminary data were obtained from the permanent records of each participating school and involved the student's age, I.Q., natural science achievement …

The problem of this study was to survey and report the perceptions of superintendents of school districts in Region 10 regarding programs of service offered by Region 10 Education Service Center. The superintendents of all public school districts in Region 10 were included in the survey study. All school districts concerned were grouped into one of three categories, according to size. The primary purpose of the study was to determine the perceptions of superintendents in Region 10 regarding programs of service offered by Region 10 Education Service Center, and to make the results available for use in planning future center operations.

Electrophoretic techniques were utilized for the demonstration of variation in 22 proteins from 24 natural populations of four species ( G. bursarius, G. pinetis, G. arenarius and G. personatus ) of the Geomys complex of pocket gophers. Of the 24 structural loci , 19 were considered to be polymorphic. Five of the six esterases contributed greatested to the polymorphism while non-esterase proteins generally showed low values. In the GeoMys complex of pocket gophers in this study,selection appeared to be the most important influence on genetic structure with some evidence of random drift in two of the four species. Populations of G. arenarius and G. personatus had the highest average interspecific genetic similarities to G. bursarius and . pinetis was the most divergent. Biochemical evidence supports the phylogeny of Geomys based on morphological and fossil data.

This study investigates the influence of inner-city and suburban student teaching upon adjustment and effectiveness of first-year elementary teachers, with secondary attention to their personal and professional problems of adjustment to their initial teaching location. The fifty-five subjects of this study were first-year, inner-city and suburban teachers in the Dallas area. Except for two Black females and three Anglo males, all were Anglo females. The findings of this study support the following conclusions 1. Student-teaching locale should not be the determining factor in deciding the type of school for first-year teachers. 2. Effective inner-city student teachers may be expected to be highly effective teachers in both inner-city schools and those in other locales. 3. Successful student-teaching experiences, regardless of location, can be expected to produce well-adjusted, effective teachers. 4. It can be anticipated that inner-city teachers will experience a negative change in optimism, attitudes toward teaching, general adjustment and mental health during their initial year of teaching. 5. Both suburban and inner-city teachers who enjoyed successful student-teaching experiences can be expected to have good self-perception, empathy, a favorable view of children, confidence regarding classroom discipline, and effectiveness as a teacher.

The problem with which this investigation was concerned was that of determining the practices utilized by college supervisors of secondary student teachers in Kentucky. A mailed questionnaire was employed to determine the emphasis of practices of the college supervisor pertaining to student teachers, cooperating teachers, and cooperating school administrators. The purposes of this study included the following: 1. To determine the status of Kentucky college and university supervisors of secondary student teachers. 2. To compare the practices of Kentucky college supervisors with practices recommended by national authorities in the field of student teaching. 3. To compare the practices reported by general supervisors with practices reported by special supervisors. 4. To compare the supervisory practices as reported in Texas in 1968 to the practices reported currently in Kentucky. The findings pertaining to the status of the Kentucky college supervisor included the following: 1. Seventy-one percent of Kentucky college supervisors reported having a total of more than ten years teaching experience at different levels. Twenty-eight percent had more than twenty years full-time teaching experience. 2. Sixty-four percent of the supervisors reported twenty-one or more student teachers as a full supervisory load. 3. Fifty-four percent of college supervisors at state schools and 39 …

The lecture recital was given July 22, 1974. A discussion of the tientos of Cabezon, Aguilera de Heredia, Coelho, Correa de Arauxo, and Cabanilles included an analysis of eight specific works, a comparison of styles, and information about performance practices. The eight works were then performed. In addition to the lecture recital three other public recitals were performed, consisting entirely of solo literature for the organ. The first solo recital, on July 2, 1971, included works of Titelouze, deGrigny, Franck, and Alain. The second solo recital, on June 18, 1973, consisted of works by Bach, Klebe, Bruhns, Reger, Heiller, and Liszt. The final solo program, on June 7, 1974, included works by Boyvin, Buxtehude, Mozart, Alain, and Reger. All four programs, recorded on magnetic tape, are filed, along with the written version of the lecture material, in the North Texas State University library.

This study has five chapters, organized in the following manner: (1) Chapter I contains the introduction, statement of the problem, purposes of the study, hypotheses, and significance of the study; (2) Chapter II is a review of the literature; (3) Chapter III is a description of subjects and tests and the procedures for treating the data; (4) Chapter IV contains the statistical technique of the analysis and the findings related to the hypotheses; and, (5) Chapter V consists of the summary, conclusions, and recommendations. The purpose of this study was to determine performance levels in the areas of (1) agility, (2) endurance, (3) reaction time, and (4) strength at high (ninety degrees Fahrenheit) and ideal (sixty-eight degrees Fahrenheit) environmental temperatures. On the basis of the findings it was concluded that (1) high temperature (ninety degrees Fahrenheit) causes human motor performance to deteriorate, and ideal temperature (sixty-eight degrees Fahrenheit) causes human motor performance to be improved; (2) the three components which showed a significant difference required more muscular action than did the component (reaction time) which showed no significant difference; (3) the majority of previous findings agree with the present research in respect to agility and reaction time; and (4) results …

The problem of this study was predicting teachers' job satisfaction and performance based upon selected factors in personal background and organizational properties of their school. The purposes of this study were to determine (1) whether seven organizational properties of a teacher's work environment were important in predicting five job satisfactions and job performance, (2) whether the five job satisfactions were important in predicting teacher job performance, and (3) whether there were significant differences in five job satisfaction scores and in performance rating between teachers grouped by fifteen independent variables. This study concluded that the use of data collected on the seven organizational properties increased the prediction of job satisfaction and performance. The addition of the five job satisfactions and seven organizational properties increased the prediction of job performance. The specific independent variables that had the highest relationship on criteria mean scores were Teaching Field, Teaching in Area of Preparation, Expenditure per Student, and Campus Size for elementary teachers. For secondary teachers the highest relationships were on Contract and Salary.

Many of the bands in the vapor-phase far-ultraviolet absorption spectra of simple molecules can often be fit to mathematical progressions referred to as molecular Rydberg series. The name Rydberg arises from the similarity between the Rydberg formula for the atomic hydrogen spectrum and the formulae for the progressions found in molecular spectra. The theories of molecular Rydberg transitions and states are discussed in terms of the inferences that have been made in the past from the available spectral data. The dipole moment changes (ca. 0.4 Debye units) from the ground state to all of the Rydberg states studied were found to be smaller than changes typically found in transitions of charge-transfer nature (ca. 1 Debye unit). The implication is that the Rydberg transitions are fairly localized. The changes in polarizability are on the order of 6 x 10⁻²⁴ cm³ and are assumed to be increases over those of the ground state.

K-Shell ionization cross section for protons over the energy range of 0.4 to 2.0 MeV have been measured on thin targets of the elements Se, Br, Rb, Sr, Y, Mo and Pd. Total x-ray and ionization cross sections for the K-shell are reported. The experimental values of the ionization cross sections are compared to the non-relativistic plane-wave Born approximation, the binary-encounter approximation, the constrained binary-encounter approximation, and the plane-wave Born approximation with corrections for Coulomb-deflection and binding energy effects.

This study investigates the effect of the helping relationship in cross-age tutoring upon the attitude toward school, self-concept, and grade average of elementary and middle-school students.The data measuring attitude toward school of those in the tutor-pupil relationship imply that this variable is the most sensitive to the tutoring program. The program resulted in a definitely superior attitude toward school for eighth graders and one sub-group of third graders. Therefore, it is concluded that cross-age tutoring can be expected to result in an improved attitude toward school on the part of children in specific age levels. Since no significant difference in self-concept was found, cross-age tutoring cannot be supported as an indirect means of improving the self-concept of children. Generally, the experimental condition of the tutor-pupil relationship did not result in higher grade averages for the experimental tutors and pupils in grades three, five, and six; however, the grade averages of lower-ability eighth-grade students showed highly significant gains over the control group. Therefore, although cross-age tutoring cannot be expected to improve academic standing of all elementary students, lower-ability eighth-grade students acting as tutors can be expected to improve their academic standing.

This investigation is a theoretical study of the influence of defects of finite volume on the electrical conductivity in the quantum size effect regime. Correction terms to existing equations are derived, and a physical explanation of the results is given. Many macroscopic properties of films exhibit an oscillatory dependence on thickness when the thickness is comparable to the de Broglie wavelength of an electron at the Fermi surface. This behavior is called the quantum size effect. In very thin films, scattering from surfaces, phonons, and crystal defects plays an increasingly important role. In this investigation the influence of scattering centers (defects) in semimetal films on the electrical conductivity is explored by extending existing work to include scattering centers of finite range. The purpose of this study is to determine the overall change in the conductivity and the alteration of the amplitude of the oscillations. The Boltzmann transport equation is the starting point for the calculation. An equation for the vector mean free path is derived, and a solution is obtained by the iterative process. The relaxation approximation need not be made since the vector mean free path is determined. The sample is a thin slab that is infinite in two …

The purpose of this study is to present a historical account of the Dallas County Community College District and to analyze and interpret the role of the political process in the District's relations with governmental agencies and civic groups. On May 25, 1965, the voters approved a $41.5 million bond issue, established a county-wide junior college district, and appointed a seven-member Board of Trustees. Secondary accounts were consulted, but the emphasis was on such primary sources as official documents of the District, publications of the District, newspaper accounts, interviews, and relevant materials from the Office of Public Information. It may be concluded that the Dallas District is a recognized leader in the community college movement. A key to its success is that it is student- and community centered. The district has experienced a rapid and tranquil growth but there may be a greater diversity of views expressed with the change in the composition of the Board.

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The focus of this study was the status of accounting instruction in public junior (community) colleges in the United States. The purposes were: (1) to make a survey and comparison of the accounting instruction which was being offered by the four types of post-secondary public institutions as listed in the Directory of Junior Colleges, (2) to determine the extent to which specially prepared materials were being utilized, (3) to determine the methods of instruction which were being utilized, and (4) to determine the work experience and educational level of the average full-time instructor who taught accounting in these institutions. The following conclusions have been drawn from an analysis of the findings: 1. The post-secondary institutions in the United States have accepted the challenge to provide technical accounting instructional programs provided this acceptance is indicated by the number of courses in accounting offered. 2. Although the institutions reported extensive offerings of different accounting courses, the instructional materials and methods were found to be the same as those in traditional accounting classes at four-year institutions which offer only degree programs in accounting. 3. Use of the cooperative method of instruction for technical accounting students was minimal. 4. The accounting instructors employed by …

This investigation concerned the effects of behavioral charting, token reinforcement, social reinforcement, and combinations of behavioral charting with token or social reinforcement, upon the production rates of sheltered workshop clients. The differential effects of these reinforcement methods were investigated by arranging for the application of each reinforcement mode in a sheltered workshop setting and comparing the mean production rates achieved by two groups of sheltered workshop clients under each reinforcement condition. The findings derived from this sample led to the conclusion that positive reinforcement, and specifically social reinforcement used both alone and in combination with behavioral charting, can be a very effective mode of reinforcement for sheltered workshop clients. It was suggested that more attention might be devoted in rehabilitation facilities to using the simpler and more readily available forms of reinforcement which behavioral charting and social reinforcement represent.

This research represents the first systematic collection of the woody plants throughout the Cross Timbers. It provides the first keys to these plants in their vegetative condition, plant descriptions, distribution maps, and some quantitative measurements used for descriptive purposes. Descriptions of the woody plants were constructed as an aid in verification after a specimen has been identified by use of the keys. The measurements given pertain only to the woody plants as they occur in the Cross Timbers. Distributional maps are provided for all the taxa considered in this research. With the exception of those species which have the ecological amplitude to grow throughout the Cross Timbers, the distribution of the majority of the remaining species seems to be most strongly influenced by average annual precipitation. In a few instances, conditions associated with latitude appear to govern the distribution of species or varieties within the Cross Timbers. Throughout the Cross Timbers, post oak (Quercus stelta), blackjack oak (Quercus marilandica), and hickory (Caraa texan) dominate the upland forests. The streamside forests are dominated by willow (alix nigra), cottonwood (Populus deltoides), and hackberry (Celtis laevi ata). The variation in the vegetation of the Cross Timbers is not due to any change in …

Rates and energies of consumption (C), egestion (F), assimilation (A), respiration (R), growth (Pg), production of exuviae (Pev), and production of egg masses (Pr) and associated efficiencies, and the effects of seasonal temperature, weight and metamorphic stage upon these factors were examined for a typical individual and cohort of Corydalus cornutus (L.) from a stream in North-Central Texas (330 23'N, 97*5'W). Dobson flies are apparently univoltine in the study area, with 11 larval instars. Emergence, oviposition and hatching occur from late May to August. The typical dobson fly hatches in mid-June, grows rapidly until November, and resumes rapid growth in March, reaching full adult size prior to leaving the stream to pupate in early June. Adult females must feed to provide energy to yolk eggs, produce egg-mass coverings and continue somatic maintenance during their week of reproductive endeavors. Metabolic compensation enables larval dobson flies to maintain preferred and fairly constant rates of R during winter (201-451 pl g-1 h~1; 5-15 C) and summer (985-1173 pl g- h1; 20-30 C); with a seasonal acclimatization change point between 15-20 C. Reduction of rates of R through undercompensation during the winter when food is scarce and through partial compensation at high temperatures during …

The literature revealed a neglect in the area of family leisure-time behavior. The problem under consideration in this investigation was leisure-time behavior among fathers with members of the immediate family. Forty five fathers were selected for this study. Fifteen fathers represented each of three social class positions as defined by the Hollingshead two-factor index of education and occupation. All fathers had to be presently married and living at the same residence with spouse and children. There had to be two or three children in the family, and they had to be within the age range of six to thirteen. Finally, all fathers were of the caucasian race. The findings supported the hypotheses relative to social class position and time and types variations. With one exception, there was a positive association between social class position and every aspect of father family leisure time when both time and types variations were considered. There was no association between social class position and the amount of leisure time a husband and wife spent together. The findings did not support the hypotheses relative to the association between familism and time and types variation of family leisure time. In most instances there was an inverse association …

The lecture recital was given on August 9, 1974. Chorale partitas by Sweelinck, Scheidt, B051hm, and Walther were performed following a lecture on the chorale partita in the Baroque period. The lecture included a discussion of the instruments that the partitas were written for and the functions for which they were written. The works of Sweelinck and Scheidt and their influence on later composers were discussed. A number of lesser-known composers and their works were mentioned. Also, there was a discussion of works by well-known composers such as Bohm, Pachelbel, Buxtehude, Walther, and Bach. In addition to the lecture recital, three other public recitals were performed, all of which consisted of solo compositions for the organ. The first solo recital, including works of Buxtehude, Bach, Walther, Pepping, ?ranck, Alain, and Durufle, was performed on July 18, 1971. On August 13, 1972 the second solo recital was performed. Compositions by Greene, Stanley, Searle, Willan, Dandrieu, Roger-Ducasse, and Langlais were included in the program. The third solo recital, which included works by Sweelinck, Bach, Guillou, and Reubke, was performed on June 5, 1974. The four programs were recorded on magnetic tape and are filed with the written version of the lecture material …

The problem of this investigation is to determine the relationships between certain cognitive, conative, and demographic variables and student ratings of instructors and introductory economics courses at North Texas State University. In addition, the study seeks to determine whether significant, interactive effects exist among the seventeen main variables: pretest, posttest, sex, age, college major, required course, actual grade, residence, SAT, socioeconomic class, Opinionation, Dogmatism, instructor, course rating, instructor rating, expected grade, and attitude. The principal sources of data are students' test scores on the Test of Understanding in College Economics, Rokeach Scales of Opinionation and Dogmatism, Modified Purdue Rating Scale, Personal Data Sheet with Hollingshead Index, and Questionnaire on Student Attitude Toward Economics-Revised. The organization of the study includes a statement of the problems, a review of the literature related to student ratings of courses and instructors, the ethodology used in the statistical analysis of the data, an analysis of the data, and the findings, conclusions, implications, and recommendations for additional research. Chapter I introduces the background and significance of the problems. Hypotheses are stated in the research form, terms in the study are defined, and limitations are delineated. Chapter II is a topically-arranged review of the related literature, including …