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1,527 Matching Results
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More connections, less connection: An examination of the effects of computer-mediated communication on relationships.
The impact of computer-mediated communication (CMC) on relational behavior is a topic of increasing interest to communication scholars (McQuillen, 2003; Tidwell & Walther, 2002). One of the most interesting issues that CMC raises concerns the impact of CMC on relational maintenance and development. Using dialectical theory, social exchange theory, social information processing theory, and the hyperpersonal perspective as theoretical frameworks, this study used quantitative and qualitative analyses to identity potential effects of CMC on relationships. Study 1 (n=317) examined the effects of CMC on relational closeness, satisfaction, and social support. Study 2 (n=196) explored the reasons individuals provide for privileging computer-mediated forms of communication, and the perceived effects of using CMC in relational communication. Results indicated that quality of CMC predicted increased perceptions of social support and relationship satisfaction. Results further suggested that CMC enabled participants to manage more effectively relational tensions of autonomy-connection and openness-closedness. Specifically, individuals used CMC to retain higher levels of conversational control, and to maintain greater numbers of relationships with decreased levels of investment. This paper concludes with a discussion of implications and directions for future research.
Date:
December 2006
Creator:
McGlynn, Joseph
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Technical Communication and the Needs of Small 501(c)(3) Organizations
This exploratory study examines documentation practices and processes in ten small non-profit organizations. The objectives of this study were to answer the following two research questions: (1) What organizational needs do small non-profit organizations have that are relevant to technical communication? and (2) How are small 501(c)(3) organizations attempting to meet these needs? Which of these attempted solutions are ineffective? Semi-structured interviews were conducted with two people from each organization: the executive director and a volunteer. Interviews were transcribed and analyzed, and grounded theory was used to identify coding categories related to documentation development. Primary findings suggest that interviewees are aware that they need documentation, yet they often postpone developing such documentation until problems develop. The study findings also suggest that interviewees across different nonprofit organizations value documentation for similar reasons. Strategies are provided for technical communicators interested in working with nonprofit organizations, and additional research avenues are identified.
Date:
May 2006
Creator:
Walton, Rebecca W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Patterns of verbal communication in children with special needs.
The social interactions between children with special needs, learning disabilities and/or attention deficit disorder (ADHD), were investigated. The children were observed in groups of three/four while creating a cooperative art project. During this activity, their interactions were recorded and coded for patterns of verbal communication. Verbal communication was evaluated through statements reflecting requests for information and materials; helping/cooperation/giving; consideration/positive reinforcement; competitiveness; intrusiveness; rejection; self-image; neutral statements; and persuasiveness. Results indicated that children with special needs tended to engage in a greater frequency of helping/cooperative/giving statements as opposed to any other verbal statements. Specifically, positive statements as opposed to negative statements classified their verbal interactions. These children also appeared to demonstrate more internalizing behaviors than externalizing behaviors. The influence of children's behaviors on children's verbal statements was examined. Results indicated that children who evidenced a disability in reading or language appeared to engage in a greater frequency of cooperative or helping statements than their non-disabled peers. Intrusive tendencies may be associated with the following: presence of a reading disability, absence of ADHD, and absence of a disability in written expression. Additionally, the conversations of children with a disability in mixed receptive language tended to evidence a greater frequency of neutral statements …
Date:
May 2006
Creator:
Conde, Joann M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
EM threat analysis for wireless systems.
Modern digital radio systems are complex and must be carefully designed, especially when expected to operate in harsh propagation environments. The ability to accurately predict the effects of propagation on wireless radio performance could lead to more efficient radio designs as well as the ability to perform vulnerability analyses before and after system deployment. In this report, the authors--experts in electromagnetic (EM) modeling and wireless communication theory--describe the construction of a simulation environment that is capable of quantifying the effects of wireless propagation on the performance of digital communication.
Date:
June 2006
Creator:
Burkholder, R. J.; Mariano, Robert J.; Schniter, P. & Gupta, I. J.
Object Type:
Report
System:
The UNT Digital Library
Comparative Study of RSS-Based Collaborative Localization Methods in Wireless Sensor Networks
In this thesis two collaborative localization techniques are studied: multidimensional scaling (MDS) and maximum likelihood estimator (MLE). A synthesis of a new location estimation method through a serial integration of these two techniques, such that an estimate is first obtained using MDS and then MLE is employed to fine-tune the MDS solution, was the subject of this research using various simulation and experimental studies. In the simulations, important issues including the effects of sensor node density, reference node density and different deployment strategies of reference nodes were addressed. In the experimental study, the path loss model of indoor environments is developed by determining the environment-specific parameters from the experimental measurement data. Then, the empirical path loss model is employed in the analysis and simulation study of the performance of collaborative localization techniques.
Date:
December 2006
Creator:
Koneru, Avanthi
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Axions in String Theory
In the context of string theory, axions appear to provide the most plausible solution of the strong CP problem. However, as has been known for a long time, in many string-based models, the axion coupling parameter Fa is several orders of magnitude higher than the standard cosmological bounds. We re-examine this problem in a variety of models, showing that Fa is close to the GUT scale or above in many models that have GUT-like phenomenology, as well as some that do not. On the other hand, in some models with Standard Model gauge fields supported on vanishing cycles, it is possible for Fa to be well below the GUT scale.
Date:
June 9, 2006
Creator:
Svrcek, Peter; /Stanford U., Phys. Dept. /SLAC; Witten, Edward & /Princeton, Inst. Advanced Study
Object Type:
Report
System:
The UNT Digital Library
Reformulating a link between social influence network theory and status characteristics theory and a method for testing that link.
The impact of social influence from others on choices made by subjects and how this influence accumulates was studied by secondary analysis of reported experimental data. To explain this impact a link is proposed between social influence network theory (SINT) and status characteristics theory (SCT). The link formula transforms stay probabilities for different status relationships of subject with one disagreeing other agent into horizontal axis coordinate values while stay probabilities of subject given two disagreeing others are transformed into vertical-axis coordinate values corresponding to the horizontal axis values for further analyses. The results support the utility of the proposed link between the two theories.
Date:
May 2006
Creator:
Hollander, James Fisher
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Ultrasonic Digital Communication System for a Steel Wall Multipath Channel: Methods and Results
As of the development of this thesis, no commercially available products have been identified for the digital communication of instrumented data across a thick ({approx} 6 n.) steel wall using ultrasound. The specific goal of the current research is to investigate the application of methods for digital communication of instrumented data (i.e., temperature, voltage, etc.) across the wall of a steel pressure vessel. The acoustic transmission of data using ultrasonic transducers prevents the need to breach the wall of such a pressure vessel which could ultimately affect its safety or lifespan, or void the homogeneity of an experiment under test. Actual digital communication paradigms are introduced and implemented for the successful dissemination of data across such a wall utilizing solely an acoustic ultrasonic link. The first, dubbed the ''single-hop'' configuration, can communicate bursts of digital data one-way across the wall using the Differential Binary Phase-Shift Keying (DBPSK) modulation technique as fast as 500 bps. The second, dubbed the ''double-hop'' configuration, transmits a carrier into the vessel, modulates it, and retransmits it externally. Using a pulsed carrier with Pulse Amplitude Modulation (PAM), this technique can communicate digital data as fast as 500 bps. Using a CW carrier, Least Mean-Squared (LMS) adaptive …
Date:
February 16, 2006
Creator:
Murphy, TL
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Differences Without Discord: Equipping Christians for Conflict - Communication Toward Reconciliation
Lecture given Tuesday, September 19, 2006, 9:45 AM at Abilene Christian University: "This class will reframe our perspective on conflict from discord to an opportunity for personal spiritual growth and service to others. Participants will gain skills for guiding conflicts toward reconciliation."
Date:
September 19, 2006
Creator:
Brenton, Angela
Object Type:
Sound
System:
The Portal to Texas History
Theory of Neutrinos: a White Paper
During 2004, four divisions of the American Physical Society commissioned a study of neutrino physics to take stock of where the field is at the moment and where it is going in the near and far future. Several working groups looked at various aspects of this vast field. The summary was published as a main report entitled ''The Neutrino Matrix'' accompanied by short 50 page versions of the report of each working group. Theoretical research in this field has been quite extensive and touches many areas and the short 50 page report [1] provided only a brief summary and overview of few of the important points. The theory discussion group felt that it may be of value to the community to publish the entire study as a white paper and the result is the current article. After a brief overview of the present knowledge of neutrino masses and mixing and some popular ways to probe the new physics implied by recent data, the white paper summarizes what can be learned about physics beyond the Standard Model from the various proposed neutrino experiments. It also comments on the impact of the experiments on our understanding of the origin of the matter-antimatter …
Date:
January 11, 2006
Creator:
Mohapatra, R. N.; Antusch, S.; Babu, K. S.; Barenboim, G.; Chen, Mu-Chun; Davidson, S. et al.
Object Type:
Report
System:
The UNT Digital Library
JAC: A Journal of Composition Theory, Volume 26, Numbers 1 & 2, 2006
JAC: A Journal of Composition Theory contains a collection of papers regarding writing and rhetoric: "The JAC is a forum for theory, research and pedagogy regarding (1) those writing courses beyond the freshman courses, excluding technical and creative writing, (2) writing in courses which are not themselves writing courses, particularly in the liberal arts and sciences, and (3) work in theory, research or pedagogy which is advanced or progressive and will shed light on the field as a whole while at the same time providing insights for advanced composition" (volume 1, number 1).
Date:
2006
Creator:
Association of Teachers of Advanced Composition (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
JAC: A Journal of Composition Theory, Volume 26, Numbers 3 & 4, 2006
JAC: A Journal of Composition Theory contains a collection of papers regarding writing and rhetoric: "The JAC is a forum for theory, research and pedagogy regarding (1) those writing courses beyond the freshman courses, excluding technical and creative writing, (2) writing in courses which are not themselves writing courses, particularly in the liberal arts and sciences, and (3) work in theory, research or pedagogy which is advanced or progressive and will shed light on the field as a whole while at the same time providing insights for advanced composition" (volume 1, number 1).
Date:
2006
Creator:
Association of Teachers of Advanced Composition (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Phenomenological Theory of the Photoevaporation Front Instability
The dynamics of photoevaporated molecular clouds is determined by the ablative pressure acting on the ionization front. An important step in the understanding of the ensuing motion is to develop the linear stability theory for the initially flat front. Despite the simplifications introduced by the linearization, the problem remains quite complex and still draws a lot of attention. The complexity is related to the large number of effects that have to be included in the analysis: acceleration of the front, possible temporal variation of the intensity of the ionizing radiation, the tilt of the radiation flux with respect to the normal to the surface, and partial absorption of the incident radiation in the ablated material. In this paper, we describe a model where all these effects can be taken into account simultaneously, and a relatively simple and universal dispersion relation can be obtained. The proposed phenomenological model may prove to be a helpful tool in assessing the feasibility of the laboratory experiments directed towards scaled modeling of astrophysical phenomena.
Date:
April 10, 2006
Creator:
Ryutov, D. D.; Kane, J. O.; Mizuta, A.; Pound, M. W. & Remington, B. A.
Object Type:
Article
System:
The UNT Digital Library
Cosmological Constant and Axions in String Theory
String theory axions appear to be promising candidates for explaining cosmological constant via quintessence. In this paper, we study conditions on the string compactifications under which axion quintessence can happen. For sufficiently large number of axions, cosmological constant can be accounted for as the potential energy of axions that have not yet relaxed to their minima. In compactifications that incorporate unified models of particle physics, the height of the axion potential can naturally fall close to the observed value of cosmological constant.
Date:
August 18, 2006
Creator:
Svrcek, Peter
Object Type:
Article
System:
The UNT Digital Library
A Comprehensive Theory of Yielding and Failure for Isotropic Materials
A theory of yielding and failure for homogeneous and isotropic materials is given. The theory is calibrated by two independent, measurable properties and from those it predicts possible failure for any given state of stress. It also differentiates between ductile yielding and brittle failure. The explicit ductile-brittle criterion depends not only upon the material specification through the two properties, but also and equally importantly depends upon the type of imposed stress state. The Mises criterion is a special (limiting) case of the present theory. A close examination of this case shows that the Mises material idealization does not necessarily imply ductile behavior under all conditions, only under most conditions. When the first invariant of the yield/failure stress state is sufficiently large relative to the distortional part, brittle failure will be expected to occur. For general material types, it is shown that it is possible to have a state of spreading plastic flow, but as the elastic-plastic boundary advances, the conditions for yielding on it can change over to conditions for brittle failure because of the evolving stress state. The general theory is of a three dimensional form and it applies to full density materials for which the yield/failure strength in …
Date:
August 10, 2006
Creator:
Christensen, R M
Object Type:
Article
System:
The UNT Digital Library
HEAVY QUARKS AT RHIC FROM PARTON TRANSPORT THEORY.
There are several indications that an opaque partonic medium is created in energetic Au+Au collisions ({radical}s{sub NN} {approx} GeV/nucleon) at the Relativistic Heavy Ion Collider (RHIC). At the extreme densities of {approx} 10-100 times normal nuclear density reached even heavy-flavor hadrons are affected significantly. Heavy-quark observables are presented from the parton transport model MPC, focusing on the nuclear suppression pattern, azimuthal anisotropy (''elliptic flow''), and azimuthal correlations. Comparison with Au + Au data at top RHIC energy {radical}s{sub NN} = 200 GeV indicates significant heavy quark rescattering, corresponding roughly five times higher opacities than estimates based on leading-order perturbative QCD. We propose measurements of charm-anticharm, e.g., D-meson azimuthal correlations as a sensitive, independent probe to corroborate these findings.
Date:
May 15, 2006
Creator:
MOLNAR, D.
Object Type:
Article
System:
The UNT Digital Library
Overview of Theory and Simulations in the Heavy Ion Fusion ScienceVirtual National Laboratory
The Heavy Ion Fusion Science Virtual National Laboratory (HIFS-VNL) is a collaboration of Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and Princeton Plasma Physics Laboratory. These laboratories, in cooperation with researchers at other institutions, are carrying out a coordinated effort to apply intense ion beams as drivers for studies of the physics of matter at extreme conditions, and ultimately for inertial fusion energy. Progress on this endeavor depends upon coordinated application of experiments, theory, and simulations. This paper describes the state of the art, with an emphasis on the coordination of modeling and experiment; developments in the simulation tools, and in the methods that underly them, are also treated.
Date:
July 9, 2006
Creator:
Friedman, Alex
Object Type:
Article
System:
The UNT Digital Library
Theoria, Volume 13, 2006
Annual journal containing essays, studies, book reviews, and other articles related to the history of Western Music Theory, methods of analysis, and analytical discussions of musical compositions. The appendix includes corrigenda from the preceding volume, information about contributors to the current volume, and an index of content in previously-issued volumes.
Date:
2006
Creator:
Heidlberger, Frank
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Overview of Theory and Simulations in the Heavy Ion Fusion Science Virtual National Laboratory
The Heavy Ion Fusion Science Virtual National Laboratory (HIFS-VNL) is a collaboration of Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and Princeton Plasma Physics Laboratory. These laboratories, in cooperation with researchers at other institutions, are carrying out a coordinated effort to apply intense ion beams as drivers for studies of the physics of matter at extreme conditions, and ultimately for inertial fusion energy. Progress on this endeavor depends upon coordinated application of experiments, theory, and simulations. This paper describes the state of the art, with an emphasis on the coordination of modeling and experiment; developments in the simulation tools, and in the methods that underly them, are also treated.
Date:
July 3, 2006
Creator:
Friedman, A
Object Type:
Article
System:
The UNT Digital Library
Theory in Practice: Constructivism and the Technology of Instruction in an Authentic Project-based Computer Class
Access:
Use of this item is restricted to the UNT Community
While literature in areas of constructivism learning theory, use of computer technology in education, and the implementation of project-based learning in the classroom have received widespread attention, there is no reported research that specifically examines the effectiveness of using a project-based learning model for computer technology instruction for pre-service teachers' programs in general, and in art education in particular. Thus, the research problem was to examine through pre- and post-test control-group experimental research design whether two different teaching methods, constructivism teaching approach (project-based learning) and traditional (step-by-step) teaching approach, result in significant differences in learning computer usage, the application of computer technical skills, design projects, and attitudes toward using of technology. The research was conducted at University of North Texas during the fall semester of 2004. Both quantitative and qualitative methods were used to collect the data. The quantitative data, collected from a pre-post test and pre and post questionnaire, was analyzed using a t-test. No significant difference was found between the groups as it relates to computer usage, one aspect of the application of computer technical skills (Photoshop usage), and attitudes towards technology. There was, however, a statistical difference between the groups in the use of the other aspect …
Date:
May 2006
Creator:
Esmaiel, Yousef Esmaiel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Finite Elements approach for Density Functional Theory calculations on locally refined meshes
We present a quadratic Finite Elements approach to discretize the Kohn-Sham equations on structured non-uniform meshes. A multigrid FAC preconditioner is proposed to iteratively solve the equations by an accelerated steepest descent scheme. The method was implemented using SAMRAI, a parallel software infrastructure for general AMR applications. Examples of applications to small nanoclusters calculations are presented.
Date:
March 27, 2006
Creator:
Fattebert, J; Hornung, R D & Wissink, A M
Object Type:
Article
System:
The UNT Digital Library
Social skills use of adolescents with learning disabilities: An application of Bandura's theory of reciprocal interaction.
This was a mixed methods study designed to investigate the social skills use of adolescents with learning disabilities through an application of Albert Bandura's theory of reciprocal interaction. Data were collected through ranking surveys, observations, interviews, and school records. Three questions were investigated. The first question was to determine whether the language deficits of LD students contributed to their general decreased social competency. Through data from the Social Skills Rating System, the seventh grade participants were considered socially competent to some degree by self report, their teachers, and their parents. Factor analysis revealed students were the best predictors of their social skills use from all data sources. In ranking participants' social skills use, students and teachers were more strongly correlated than were students and parents, or teachers and parents. No relationship of any strength existed between the participants' cognitive ability and their social competence. A use of Bandura's determinants indicated that a relationship existed between some subtypes of learning disabilities and some types of social skills misuse. The participants diagnosed with reading disability, auditory processing disability, receptive/expressive language disability, or nonverbal learning disability all made the majority of their observed social skills errors in the environmental determinant of Bandura's triad …
Date:
May 2006
Creator:
Clore, Christine W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Black/Non-Black Theory of African-American Partisanship: Hostility, Racial Consciousness and the Republican Party
Why is black partisan identification so one-sidedly Democratic forty years past the Civil Rights movement? A black/non-black political dichotomy manifests itself through one-sided African-American partisanship. Racial consciousness and Republican hostility is the basis of the black/non-black political dichotomy, which manifests through African-American partisanship. Racial consciousness forced blacks to take a unique and somewhat jaundiced approach to politics and Republican hostility to black inclusion in the political process in the 1960s followed by antagonism toward public policy contribute to overwhelming black Democratic partisanship. Results shown in this dissertation demonstrate that variables representing economic issues, socioeconomic status and religiosity fail to explain partisan identification to the extent that Hostility-Consciousness explains party identification.
Date:
May 2006
Creator:
King, Marvin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Four-Loop Planar Amplitude and Cusp Anomalous Dimension in Maximally Supersymmetric Yang-Mills Theory
We present an expression for the leading-color (planar) four-loop four-point amplitude of N = 4 supersymmetric Yang-Mills theory in 4-2{epsilon} dimensions, in terms of eight separate integrals. The expression is based on consistency of unitarity cuts and infrared divergences. We expand the integrals around {epsilon} = 0, and obtain analytic expressions for the poles from 1/{epsilon}{sup 8} through 1/{epsilon}{sup 4}. We give numerical results for the coefficients of the 1/{epsilon}{sup 3} and 1/e{sup 2} poles. These results all match the known exponentiated structure of the infrared divergences, at four separate kinematic points. The value of the 1/{epsilon}{sup 2} coefficient allows us to test a conjecture of Eden and Staudacher for the four-loop cusp (soft) anomalous dimension. We find that the conjecture is incorrect, although our numerical results suggest that a simple modification of the expression, flipping the sign of the term containing {zeta}{sub 3}{sup 2}, may yield the correct answer. Our numerical value can be used, in a scheme proposed by Kotikov, Lipatov and Velizhanin, to estimate the two constants in the strong-coupling expansion of the cusp anomalous dimension that are known from string theory. The estimate works to 2.6% and 5% accuracy, providing non-trivial evidence in support of the …
Date:
November 15, 2006
Creator:
Bern, Zvi; Czakon, Michael; Dixon, Lance J.; Kosower, David A. & Smirnov, Vladimir A.
Object Type:
Article
System:
The UNT Digital Library