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TASI Lectures on the cosmological constant

Description: The energy density of the vacuum, Lambda, is at least 60 orders of magnitude smaller than several known contributions to it. Approaches to this problem are tightly constrained by data ranging from elementary observations to precision experiments. Absent overwhelming evidence to the contrary, dark energy can only be interpreted as vacuum energy, so the venerable assumption that Lambda=0 conflicts with observation. The possibility remains that Lambda is fundamentally variable, though constant over large spacetime regions. This can explain the observed value, but only in a theory satisfying a number of restrictive kinematic and dynamical conditions. String theory offers a concrete realization through its landscape of metastable vacua.
Date: August 30, 2007
Creator: Bousso, Raphael & Bousso, Raphael
Partner: UNT Libraries Government Documents Department

Enhancing the Effectiveness of the Lecture Method Through Narrative: the Development of a Model and Manual for Creating and Using Didactic Narratives

Description: Studies show that the use of narratives enhances the lecture method of teaching. The model and manual developed in this study focus on the needs of lecturers who require creative guidance in all aspects of creating and using didactic narratives. This study suggests that the subject content of a lecture has a deep structure that can be used to generate the surface structure of a didactic narrative. The model and manual are informed by theories and models from a variety of disciplines that have been adapted for analyzing subject content, transforming subject content structure into a parallel narrative structure, and integrating the narrative into lecture.
Date: August 1990
Creator: Kirkland, Debra K. (Debra Kay)
Partner: UNT Libraries

[In House UNT, August 1995]

Description: A page from the "In House" newsletter, published by the University of North Texas. This page details information of upcoming guest lecturers and achievements by professors and educators. Dr. William McCarter, regents professor of visual arts is giving his lecture "Integration of Visual Arts Into the Public School Curriculum," May 2.
Date: August 1996
Creator: In House
Partner: UNT Libraries Special Collections

A Study of the Use of Computer-Assisted-Instruction for Older Learners in a Continuing Education Program

Description: The purpose of this study was to assess the achievement of older learners when using computer-assisted-instruction tutorials with no time limits and to compare this achievement with that of other older students who were taught by the conventional lecture method of instruction. The effects of prior formal education, physical limitations, socioeconomic status, and sex were also identified. Students in the age categories fifty-five to sixty-seven and sixty-eight and over were placed at random in either a control group that would receive instruction in the conventional lecture method or a treatment group that would receive computer-assisted-instruction. Each of the students in the study completed a demographic data form, received instruction, and was tested over the topics which had been covered. The test scores and demographic data were summarized and analyzed using two-way analysis of variance. The purpose of the analysis was to determine (1) if there was a significant difference in the effectiveness of the two methods of instruction, (2) if there was a significant difference in the performance of the two age categories, (3) if there was a significant interaction between the age levels and the methods of instruction, and (4) if the test scores were affected by past formal education, physical limitations, socioeconomic status, or sex. It was determined that students in the computer-assisted-instruction groups scored as well as those in the conventional lecture method of presentation groups. There were no significant effects from past formal education, physical limitations, socioeconomic status, or sex. However, there were trends in the data that warrant further study. It was recommended that educators be encouraged to use computer-assisted-instruction tutorials when working with older students. CAI was found to be at least as effective as the more conventional lecture method, and the growth and expansion of computer technology makes this a viable option for ...
Date: August 1989
Creator: Richardson, Susan Morris
Partner: UNT Libraries

IBA for novice experimentalists. I. Introduction to IBA: mostly symmetries. II. Tests in even-even nuclei: mostly transitional systems. III. Supersymmetries: theory and experiment

Description: The report contains the notes from a series of lectures on the Interacting Boson Approximation (IBA) model. The lectures were presented at Lawrence Livermore National Laboratory on July 28, 30 and August 1, 1982 by Jolie A. Cizewski from Yale University. The IBA was developed by F. Iachello and A. Arima starting about seven years ago to understand collective quadrupole excitations in medium and heavy mass nuclei away from closed shells. Since then the formalism has been extended to odd-mass nuclei and considerable work has gone into understanding the microscopic construction of the bosons in this model. The IBA has been applied to nuclei as light as Zn and Ge and as heavy as U and Pu; to nuclei near closed shells, such as Mo and Hg; to stable nuclei and nuclei far from stability. The present lectures were designed to give the experimentalist an introduction to the IBA and to give specific examples of how it could be applied to understand the structure of heavy even and odd mass nuclei. Much of the emphasis was on the symmetries (and supersymmetries) of the model and how the use of symmetries enabled the relatively straightforward understanding of empirical systems as deviations from these symmetries. The richness of possible applications of the IBA to understanding collective phenomena in nuclei was not fully explored, but rather a few illustrative examples were selected and described in detail. The references, accumulated at the end of this report, provide a more comprehensive, although not complete, list of tests of the IBA in even mass nuclei and the new symmetries in odd mass nuclei. The references also list the main theoretical papers which provide the details of the IBA formalism.
Date: August 1, 1982
Creator: Cizewski, J.A.
Partner: UNT Libraries Government Documents Department

Topics in perturbative QCD beyond the leading order. [Review lectures]

Description: The basic structure of QCD formulae for various inclusive and semi-inclusive processes is presented. Next to leading order QCD corrections to inclusive deep-inelastic scattering are discussed in some detail. The methods for calculations of QCD corrections (leading, next to leading) to semi-inclusive processes are outlined. Some results of these calculations are discussed. 58 references.
Date: August 1, 1979
Creator: Buras, A.J.
Partner: UNT Libraries Government Documents Department

Z/sup 0/ decay modes - experimental measurements

Description: This report summarizes three lectures given at the Theoretical Advanced Study Institute at the University of Michigan at Ann Arbor. The lectures begin with an introduction to storage rings and linear colliders with special reference to the parameters of the SLC and LEP. The rigors of the Z/sup 0/ environment are presented along with the requirements for SLC and LEP detectors. The pedagogy needed for testing the Standard Model is developed, and some experimental tests of the Standard Model are discussed. Tests which involve extensions of the Standard Model (charged Higgs particles, more generations) as well as a few examples of how supersymmetry may show up at the Z/sup 0/ are discussed. 25 references, 34 figures. (WHK)
Date: August 1, 1984
Creator: Dorfan, J.M.
Partner: UNT Libraries Government Documents Department

Weak interactions at high energies. [Lectures, review]

Description: Review lectures are presented on the phenomenological implications of the modern spontaneously broken gauge theories of the weak and electromagnetic interactions, and some observations are made about which high energy experiments probe what aspects of gauge theories. Basic quantum chromodynamics phenomenology is covered including momentum dependent effective quark distributions, the transverse momentum cutoff, search for gluons as sources of hadron jets, the status and prospects for the spectroscopy of fundamental fermions and how fermions may be used to probe aspects of the weak and electromagnetic gauge theory, studies of intermediate vector bosons, and miscellaneous possibilities suggested by gauge theories from the Higgs bosons to speculations about proton decay. 187 references. (JFP)
Date: August 1, 1978
Creator: Ellis, J.
Partner: UNT Libraries Government Documents Department

Introduction to quantum chromo transport theory for quark-gluon plasmas

Description: Upcoming heavy ion experiments at the AGS and SPS are aimed at producing and diagnosing a primordial form of matter, the quark-gluon plasma. In these lectures some recent developments on formulating a quantum transport theory for quark-gluon plasmas are introduced. 46 refs.
Date: August 1, 1986
Creator: Gyulassy, M.; Elze, H.Th.; Iwazaki, A. & Vasak, D.
Partner: UNT Libraries Government Documents Department

Spin and isospin fluctuations in heavy ion collisions and their dependence upon the shape of the dinuclear complex

Description: The relevance of higher multipoles of giant isovector modes in the charge distribution of deep inelastic fragments is discussed and found to depend strongly on mass asymmetry. The sources of angular momentum fluctuations are investigated. Quantal effects are considered as well as effects arising from non-equilibrium and equilibrium statistical fluctuations. A model based upon equilibrium statistical mechanics is considered in detail, and used to predict both 2nd moments of the angular momentum distributions and the angular momentum misalignment. Analytical expressions are derived to calculate the angular distributions of sequentially emitted particles, fission fragments, as well as gamma rays in terms of the angular momentum misalignment. Recent data on the angular distributions of sequential alphas, fission and gamma rays are analyzed in terms of the model. 29 figures, 1 table.
Date: August 1, 1980
Creator: Moretto, L.G.
Partner: UNT Libraries Government Documents Department

Gauge theories of the weak interactions. [Lectures]

Description: Two lectures are presented on the Weinberg--Salam--Glashow--Iliopoulos--Maiani gauge theory for weak interactions. An attempt is made to give some impressions of the generality of this model, how it was developed, variations found in the literature, and the status of the standard model. 21 references (JFP).
Date: August 1, 1978
Creator: Quinn, H.
Partner: UNT Libraries Government Documents Department