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Note on Zeno's paradox in quantum theory
A decaying quantum system, if observed very frequently in order to ascertain whether or not it is still undecayed, will not decay at all. The derivation of this effect - known, e.g., as Zeno's paradox - has been criticized recently. It has been argued that measurements performed in a very short time interval, ..delta..t, produce states with a very large energy uncertanty, ..delta..E, and that Zeno's paradox disappears if this is taken into account. By construction of an explicit counterexample it is proved, however, that there is no energy-time uncertainty relation of the required kind; therefore, the criticism mentioned is unjustified.
Date:
February 1, 1980
Creator:
Kraus, K.
Object Type:
Report
System:
The UNT Digital Library
Critical Connections: Communication for the Future
The U.S. communication infrastructure is changing rapidly as a result of technological advances, deregulation, and an economic climate that is increasingly competitive. This change is affecting the way in which information is created, processed, transmitted, and provided to individuals and institutions. The report analyzes the implications of new communication technologies for business, politics, culture, and individuals, and suggests possible strategies and options for congressional consideration.
Date:
February 1990
Creator:
United States. Congress. Office of Technology Assessment.
Object Type:
Report
System:
The UNT Digital Library
Bergson and the unification of the sciences
Louis De Broglie and M. Capek have described some interesting similarities between the philosophical ideas of Henri Bergson and the profound conceptual changes introduced into physics by quantum theory and the theory of relativity. These similarities are neither identities nor direct causal links, and hence physicists are likely to regard them as mere curiosities having no import for the development of science. However, another view is possible: if Bergson's thinking presaged, at least in spirit, these two revolutionary advances in physics then his intuitions may accord sufficiently with nature to provide useful guidance in the approach to other deep problems in science. Pursuing this idea I shall indicate here how Bergson's intuitions suggest a possible approach to perhaps the fundamental problem of contemporary science, namely the problem of constructing an overarching theoretical framework for unifying the various branches of science from psychology through biology to physics. 19 refs.
Date:
February 1, 1985
Creator:
Stapp, Henry P.
Object Type:
Article
System:
The UNT Digital Library
The Relationships Among Self-Esteem, Marital Communication, and Marital Adjustment
This investigation seeks to determine the correlations among the three factors of self-esteem, marital communication and marital adjustment to determine if these factors are evidenced similarly in the marital system, and to determine if their relationships are consistent among a wide range of marriages. In addition, several demographic variables are isolated in order to determine their influence on the three factors under investigation. Based on the findings of the study, it was concluded that marital adjustment is dependent on married individuals' level of self-esteem and the ability to communicate effectively. It was also concluded that when there is a high level of either self-esteem, marital communiation, or marital adjustment, the other factors will also be at a high level. In addition, the consistency of the relationships among marital adjustment, marital communication, and self-esteem apparently transcend demographic factors.
Date:
February 1980
Creator:
Carter, Warren Leslie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Statistical Scalability Analysis of Communication Operations in Distributed Applications
Current trends in high performance computing suggest that users will soon have widespread access to clusters of multiprocessors with hundreds, if not thousands, of processors. This unprecedented degree of parallelism will undoubtedly expose scalability limitations in existing applications, where scalability is the ability of a parallel algorithm on a parallel architecture to effectively utilize an increasing number of processors. Users will need precise and automated techniques for detecting the cause of limited scalability. This paper addresses this dilemma. First, we argue that users face numerous challenges in understanding application scalability: managing substantial amounts of experiment data, extracting useful trends from this data, and reconciling performance information with their application's design. Second, we propose a solution to automate this data analysis problem by applying fundamental statistical techniques to scalability experiment data. Finally, we evaluate our operational prototype on several applications, and show that statistical techniques offer an effective strategy for assessing application scalability. In particular, we find that non-parametric correlation of the number of tasks to the ratio of the time for individual communication operations to overall communication time provides a reliable measure for identifying communication operations that scale poorly.
Date:
February 27, 2001
Creator:
Vetter, J S & McCracken, M O
Object Type:
Article
System:
The UNT Digital Library
Guide to preparing SAND Reports and other communication products.
This guide describes the R&A process, Common Look and Feel requirements, and preparation and publishing procedures for communication products at Sandia National Laboratories. Samples of forms and examples of published communications products are provided.
Date:
February 1, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
THEORY OF THE FIREBALL
None
Date:
February 1, 1964
Creator:
Bethe, H. A.
Object Type:
Report
System:
The UNT Digital Library
Resilience: Theory and Application.
There is strong agreement among policymakers, practitioners, and academic researchers that the concept of resilience must play a major role in assessing the extent to which various entities - critical infrastructure owners and operators, communities, regions, and the Nation - are prepared to respond to and recover from the full range of threats they face. Despite this agreement, consensus regarding important issues, such as how resilience should be defined, assessed, and measured, is lacking. The analysis presented here is part of a broader research effort to develop and implement assessments of resilience at the asset/facility and community/regional levels. The literature contains various definitions of resilience. Some studies have defined resilience as the ability of an entity to recover, or 'bounce back,' from the adverse effects of a natural or manmade threat. Such a definition assumes that actions taken prior to the occurrence of an adverse event - actions typically associated with resistance and anticipation - are not properly included as determinants of resilience. Other analyses, in contrast, include one or more of these actions in their definitions. To accommodate these different definitions, we recognize a subset of resistance- and anticipation-related actions that are taken based on the assumption that an …
Date:
February 3, 2012
Creator:
Carlson, J. L.; Haffenden, R. A.; Bassett, G. W.; Buehring, W. A.; Collins, M. J., III; Folga, S. M. et al.
Object Type:
Report
System:
The UNT Digital Library
Advanced accelerator theory development
A new accelerator technology, the dielectric wall accelerator (DWA), is potentially an ultra compact accelerator/pulsed power driver. This new accelerator relies on three new components: the ultra-high gradient insulator, the asymmetric Blumlein and low jitter switches. In this report, we focused our attention on the first two components of the DWA system the insulators and the asymmetric Blumlein. First, we sought to develop the necessary design tools to model and scale the behavior of the high gradient insulator. To perform this task we concentrated on modeling the discharge processes (i.e., initiation and creation of the surface discharge). In addition, because these high gradient structures exhibit favorable microwave properties in certain accelerator configurations, we performed experiments and calculations to determine the relevant electromagnetic properties. Second, we performed circuit modeling to understand energy coupling to dynamic loads by the asymmetric Blumlein. Further, we have experimentally observed a non-linear coupling effect in certain asymmetric Blumlein configurations. That is, as these structures are stacked into a complete module, the output voltage does not sum linearly and a lower than expected output voltage results. Although we solved this effect experimentally, we performed calculations to understand this effect more fully to allow better optimization of this …
Date:
February 9, 1998
Creator:
Sampayan, S.E.; Houck, T.L.; Poole, B.; Tishchenko, N.; Vitello, P.A. & Wang, I.
Object Type:
Report
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
A Short Introduction to General Gyrokinetic Theory
Interesting plasmas in the laboratory and space are magnetized. General gyrokinetic theory is about a symmetry, gyro-symmetry, in the Vlasov-Maxwell system for magnetized plasmas. The most general gyrokinetic theory can be geometrically formulated. First, the coordinate-free, geometric Vlasov-Maxwell equations are developed in the 7-D phase space, which is defined as a fiber bundle over the space-time. The Poincar{copyright}-Cartan-Einstein 1-form pullbacked onto the 7-D phase space determines particles' worldlines in the phase space, and realizes the momentum integrals in kinetic theory as fiber integrals. The infinite small generator of the gyro-symmetry is then asymptotically constructed as the base for the gyrophase coordinate of the gyrocenter coordinate system. This is accomplished by applying the Lie coordinate perturbation method to the Poincar{copyright}-Cartan-Einstein 1-form, which also generates the most relaxed condition under which the gyro-symmetry still exists. General gyrokinetic Vlasov-Maxwell equations are then developed as the Vlasov-Maxwell equations in the gyrocenter coordinate system, rather than a set of new equations. Since the general gyrokinetic system-developed is geometrically the same as the Vlasov-Maxwell equations, all the coordinate independent properties of the Vlasov-Maxwell equations, such as energy conservation, momentum conservation, and Liouville volume conservation, are automatically carried over to the general gyrokinetic system. The pullback transformation …
Date:
February 14, 2005
Creator:
Qin, H.
Object Type:
Report
System:
The UNT Digital Library
Magnetic fields and density functional theory
A major focus of this dissertation is the development of functionals for the magnetic susceptibility and the chemical shielding within the context of magnetic field density functional theory (BDFT). These functionals depend on the electron density in the absence of the field, which is unlike any other treatment of these responses. There have been several advances made within this theory. The first of which is the development of local density functionals for chemical shieldings and magnetic susceptibilities. There are the first such functionals ever proposed. These parameters have been studied by constructing functionals for the current density and then using the Biot-Savart equations to obtain the responses. In order to examine the advantages and disadvantages of the local functionals, they were tested numerically on some small molecules.
Date:
February 1, 1999
Creator:
Salsbury Jr., Freddie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Mass Communication Evangelism Symposium
Lecture given Wednesday, February 21, 1990, 11:00 AM at Abilene Christian University
Date:
February 21, 1990
Creator:
unknown
Object Type:
Sound
System:
The Portal to Texas History
Managing corporate capabilities:theory and industry approaches.
This study characterizes theoretical and industry approaches to organizational capabilities management and ascertains whether there is a distinct ''best practice'' in this regard. We consider both physical capabilities, such as technical disciplines and infrastructure, and non-physical capabilities such as corporate culture and organizational procedures. We examine Resource-Based Theory (RBT), which is the predominant organizational management theory focused on capabilities. RBT seeks to explain the effect of capabilities on competitiveness, and thus provide a basis for investment/divestment decisions. We then analyze industry approaches described to us in interviews with representatives from Goodyear, 3M, Intel, Ford, NASA, Lockheed Martin, and Boeing. We found diversity amongst the industry capability management approaches. Although all organizations manage capabilities and consider them to some degree in their strategies, no two approaches that we observed were identical. Furthermore, we observed that theory is not a strong driver in this regard. No organization used the term ''Resource-Based Theory'', nor did any organization mention any other guiding theory or practice from the organizational management literature when explaining their capabilities management approaches. As such, we concluded that there is no single best practice for capabilities management. Nevertheless, we believe that RBT and the diverse industry experiences described herein can provide …
Date:
February 1, 2007
Creator:
Slavin, Adam M.
Object Type:
Report
System:
The UNT Digital Library
AN APPLICATION OF FUZZY SET THEORY TO DATA DISPLAY
Categorization supports decision making, letting an analyst look at data from different perspectives and different levels of detail. An approach to data analysis is described in which membership in subjectively defined categories is modeled by the fuzzy nature of color categories and presented via computer graphics for visual inspection by the analyst.
Date:
February 1, 1981
Creator:
Benson, William H.
Object Type:
Article
System:
The UNT Digital Library
Correlation of Exponential Pile Lattice Measurements With Theory
Using diffusion theory type formulas for the calculation of thermal utilization, and resonance escape probabilities, and in particular those formulas of Rumsey and Volkoff, an effort has been made to correlate experimentally measured bucklings (Exponential Pile Program at Hanford) with those calculated from theory.
Date:
February 1, 1955
Creator:
Clayton, E. D. & Richey, C. R.
Object Type:
Report
System:
The UNT Digital Library
Measurements of interfacial area concentration in two-phase flow with two-point conductivity probe. Brief communication
Kataoka, Ishii and Serizawa analyzed the measurements of the local time-averaged interfacial area concentration in two-phase flow with a two-point conductivity probe. They considered the influence of the bubble velocity fluctuation on the measurement and directly transferred the mathematics concept of the local time-averaged interfacial area concentration into the measurable parameters. In the end of the derivation, however, the expression of the interfacial area concentration was inappropriate due to the over-simplification to the integration limits of the probability distributions. Consequently, the resultant interfacial area concentration may be significantly lower than the actual value. Since the formula is very important for the interpretation of experimental data, we feel it is necessary to provide a correction to the original work.
Date:
February 1, 1997
Creator:
Wu, Q.; Zheng, D.; Ishii, M. & Beus, S.G.
Object Type:
Report
System:
The UNT Digital Library
A generalized stationary point convergence theory for evolutionary algorithms
This paper presents a convergence theory for evolutionary pattern search algorithms (EPSAs). EPSAs are self-adapting evolutionary algorithms that modify the step size of the mutation operator in response to the success of previous optimization steps. Previously, the authors have proven a stationary point convergence theory for EPSAs for which the step size is not allowed to increase. The present analysis generalizes this analysis to prove a convergence theory for EPSAs that are allowed to both increase and decrease the step size. This convergence theory is based on an extension of the convergence theory for generalized pattern search methods.
Date:
February 1, 1997
Creator:
Hart, W.E.
Object Type:
Article
System:
The UNT Digital Library
Centering Information Literacy (as) Skills and Civic Engagement in the Basic Communication Course: An Integrated Course Library Collaboration
This article describes a course-library partnership to integrate information literacy instruction with a basic communication course.
Date:
February 2017
Creator:
Herakova, Liliana; Bonnet, Jennifer & Congdon, Mark
Object Type:
Article
System:
The UNT Digital Library
Policies and procedures of the Office of Technology Assessment : communication with Congress and the public
A manual for OTA employees, providing guidance for drafting proposals and reports. Includes standards and procedures for communicating with Congress.
Date:
February 1986
Creator:
United States. Office of Technology Assessment.
Object Type:
Book
System:
The UNT Digital Library
Third minima in thorium and uranium isotopes in the self-consistent theory
None
Date:
February 1, 2013
Creator:
McDonnell, J; Nazarewicz, W & Sheikh, J A
Object Type:
Article
System:
The UNT Digital Library
Simplifying Multi-loop Integrands of Gauge Theory and Gravity Amplitudes
We use the duality between color and kinematics to simplify the construction of the complete four-loop four-point amplitude of N = 4 super-Yang-Mills theory, including the nonplanar contributions. The duality completely determines the amplitude's integrand in terms of just two planar graphs. The existence of a manifestly dual gauge-theory amplitude trivializes the construction of the corresponding N = 8 supergravity integrand, whose graph numerators are double copies (squares) of the N = 4 super-Yang-Mills numerators. The success of this procedure provides further nontrivial evidence that the duality and double-copy properties hold at loop level. The new form of the four-loop four-point supergravity amplitude makes manifest the same ultraviolet power counting as the corresponding N = 4 super-Yang-Mills amplitude. We determine the amplitude's ultraviolet pole in the critical dimension of D = 11/2, the same dimension as for N = 4 super-Yang-Mills theory. Strikingly, exactly the same combination of vacuum integrals (after simplification) describes the ultraviolet divergence of N = 8 supergravity as the subleading-in-1/N{sub c}{sup 2} single-trace divergence in N = 4 super-Yang-Mills theory.
Date:
February 15, 2012
Creator:
Bern, Z.; Carrasco, J.J.M.; Dixon, L.J.; Johansson, H. & Roiban, R.
Object Type:
Article
System:
The UNT Digital Library
Theory and applications of maps on SO(3) in nuclear magnetic resonance
Theoretical approaches and experimental work in the design of multiple pulse sequences in Nuclear Magnetic Resonance (NMR) are the subjects of this dissertation. Sequences of discrete pulses which reproduce the nominal effect of single pulses, but over substantially broader, narrower, or more selective ranges of transition frequencies, radiofrequency field amplitudes, and spin-spin couplings than the single pulses they replace, are developed and demonstrated. 107 refs., 86 figs., 6 tabs.
Date:
February 1, 1987
Creator:
Cho, H. M.
Object Type:
Report
System:
The UNT Digital Library
Theory of energetic trapped particle-induced resistive interchange-ballooning modes
A theory describing the influence of energetic trapped particles on resistive interchange-ballooning modes in tokamaks is presented. It is shown that a population of hot particles trapped in the region of adverse curvature can resonantly interact with and destabilize the resistive interchange mode, which is stable in their absence because of favorable average curvature. The mode is different from the usual resistive interchange mode not only in its destabilization mechanism, but also in that it has a real component to its frequency comparable to the precessional drift frequency of the rapidly circulating energetic species. Corresponding growth rate and threshold conditions for this trapped-particle-driven instability are derived and finite banana width effects are shown to have a stabilizing effect on the mode. Finally, the ballooning/tearing dispersion relation is generalized to include hot particles, so that both the ideal and the resistive modes are derivable in the appropriate limits. 23 refs., 7 figs.
Date:
February 1, 1986
Creator:
Biglari, H. & Chen, L.
Object Type:
Report
System:
The UNT Digital Library