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5,300 Matching Results
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Competition between SMES and flywheels
The benefits of flywheel energy storage using high-temperature superconducting bearings is compared to that of SMES for the same applications. Flywheels cover the same range of energy storage times as SMES but their scaling relationships make them inherently more amenable to modular manufacture. In addition, the magnetic fields seen by the environment are considerably reduced for flywheels.
Date:
February 1, 1995
Creator:
Hull, J.R.
System:
The UNT Digital Library
Phase Competition in Trisected Superconducting Dome
None
Date:
October 2, 2012
Creator:
Vishik, I.M.; Hashimoto, M; He, Rui-Hua; Lee, Wei-Sheng; Schmitt, Felix; Lu, Donghui et al.
System:
The UNT Digital Library
Population of superdeformed bands and competition with fission
Average entry points for superdeformed (SD) and normal states have been measured in {sup 191, 192}Hg and in {sup 152}Dy. Compared with normal states, the superdeformed states have entry spins {approximately} 10 h higher and internal excitation energies (U = E --- E{sub yrast}) at least 2 MeV lower for the Hg cases and about 8 MeV lower for {sup 152}Dy. By comparison with calculated {ell}- distributions of evaporation residues (ER), using CASCADE to compute the fission competition, we find that the initial population of the SD band in {sup 192}Hg originates from the tail of the ER spin distribution. 12 refs., 5 figs.
Date:
January 1, 1990
Creator:
Moore, E. F.; Janssens, R. V. F.; Khoo, T. L.; Ahmad, I.; Carpenter, M. P.; Chasman, R. R. et al.
System:
The UNT Digital Library
THE MBX CHALLENGE COMPETITION: A NEUTRON MATTER MODEL
The Bertsch, non-parametric model of neutron matter is analyzed and strong indications are found that, in the infinite system limit, the ground state is a Fermi liquid with an effective mass, except for a set of measure zero.
Date:
November 1, 1999
Creator:
BAKER, G.
System:
The UNT Digital Library
Pattern Selection and Competition in Near-Integrable Systems
Pattern selection and competition in certain near-integrable systems are discussed. These systems provide models for controlled studies of low dimensional attractors in high (infinite) dimensional systems. Four examples from damped, driven pendulum rings are summarized in the order of increasing spatial complexity of their chaotic attractors. These examples illustrate the use of numerical and analytical techniques from soliton mathematics to study properties of chaotic attractors. In particular, the connection of (unperturbed) homoclinic states with instabilities of spatial patterns, with interactions between patterns, and as possible sources of temporal chaos is emphasized. 16 refs., 9 figs.
Date:
January 1, 1986
Creator:
Bishop, A. R. & McLaughlin, D. W.
System:
The UNT Digital Library
Will competition hurt electricity consumers in the Pacific Northwest
A computer model was developed at Oak Ridge National Laboratory to analyze the electricity production, costs, and prices for two geographical regions for a single year. Bulk-power trading is allowed between the two regions and market clearing prices are determined based on marginal costs. The authors used this model, ORCED, to evaluate the market price of power over the year 2000 in the Pacific Northwest and California. The authors found that, absent intervention by the regulators in the Northwest, generation prices would increase 1.1 {cents}/kWh on average, from 1.91 {cents}/kWh for the regulated price to 3.02 {cents}/kWh as the competitive price. If regulators use transition charges and price caps, then customers in the Pacific Northwest need not be penalized by the change to marginal-cost pricing. Customer responses to price changes will increase the transfer of power between regions. A gas price increase of 20%, while only raising the average-cost-based price to 1.95 {cents}/kWh, raised the marginal-cost-based price to 3.56{cents}/kWh. Reductions in hydroelectric resources also dramatically change the price and flow of power.
Date:
November 1998
Creator:
Hadley, S. & Hirst, E.
System:
The UNT Digital Library
Design Competition for Development of a General Purpose Fissile Package
Department of Transportation (DOT) 6M specification packages have been used extensively for transportation of radioactive materials since the 1960s. The objective of the Savannah River Site (SRS) design competition was to advance the development of a new performance-based and compliance-certifiable package as a candidate for replacement of the obsolescent DOT 6M/6L specification package.
Date:
April 22, 2003
Creator:
Houghtaling, T. K.
System:
The UNT Digital Library
Mode competition effects in free electron lasers and gyrotrons
In many cases in high frequency, high power coherent radiation generators (such as free electron laser and gyrotrons) the linear gain is positive for many modes and therefore these modes will grow and compete for the beam energy. The questions related to mode competition, coherency of the radiation and maximization of the interaction efficiency are of great importance. To address these issues simple multi-mode models have been formulated. This paper is a short review of the recent results from both simulation and analyses of these models. 3 figs.
Date:
January 1, 1990
Creator:
Levush, B. & Antonsen, T. M.
System:
The UNT Digital Library
Importing Change: Canadian Competition and the U.S. Floriculture Industry
This article analyzes the shifting geography of production with respect to the U.S. floriculture industry.
Date:
2008
Creator:
Reid, Neil; Smith, Bruce W.; Gatrell, Jay D. & Carroll, Michael C.
System:
The UNT Digital Library
BDS Thin Film UV Antireflection Laser Damage Competition
UV antireflection coatings are a challenging coating for high power laser applications as exemplified by the use of uncoated Brewster's windows in laser cavities. In order to understand the current laser resistance of UV AR coatings in the industrial and university sectors, a double blind laser damage competition was performed. The coatings have a maximum reflectance of 0.5% at 355 nm at normal incidence. Damage testing will be performed using the raster scan method with a 7.5 ns pulse length on a single testing facility to facilitate direct comparisons. In addition to the laser resistance results, details of deposition processes and coating materials will also be shared.
Date:
October 26, 2010
Creator:
Stolz, C J
System:
The UNT Digital Library
Shape competition and alignment processes in light Au and Pt nuclei
Calculations are presented and data are reviewed on the properties of the high-j states in the light Au nuclei. Both prolate and oblate structures are observed in this region. It is found that the collective model describes well the band-head and the high-spin properties of the h/sub 9/2/ and i/sub 13/2/ proton states, without resort to an ''intruder state'' phenomenology.
Date:
January 1, 1985
Creator:
Riedinger, L.L.; Larabee, A.J. & Zhang, J.Y.
System:
The UNT Digital Library
Brewster Angle Polarizing Beamsplitter Laser Damage Competition: "P" polarization
None
Date:
November 8, 2012
Creator:
Stolz, C. J. & Runkel, J.
System:
The UNT Digital Library
Understanding the mechanisms of length scale competition: The sine-Gordan soliton case
We have examined the dynamical behavior of the kink solutions of the one-dimensional sine-Gordon equation in the presence of a spatially periodic parametric perturbation. We report on a novel occurrence of length scale competition in this system and show how it can be understood by means of linear stability analysis.
Date:
August 1, 1994
Creator:
Sanchez, A.; Bishop, A. R. & Dominguez-Adame, F.
System:
The UNT Digital Library
Bioenergy market competition for biomass: A system dynamics review of current policies
There is growing interest in the United States and abroad to increase the use of biomass as an energy source due to environmental and energy security benefits. In the United States, the biofuel and biopower industries are regulated by different policies and different agencies and have different drivers, which impact the maximum price the industries are willing to pay for biomass. This article describes a dynamic computer simulation model that analyzes future behavior of bioenergy feedstock markets based on varying policy and technical options. The model simulates the long-term dynamics of these markets by treating advanced biomass feedstocks as a commodity and projecting the total demand of each industry, as well as the market price over time. The model is used for an analysis of the United States bioenergy feedstock market that projects supply, demand, and market price given three independent buyers: domestic biopower, domestic biofuels, and foreign exports. With base-case assumptions, the biofuels industry is able to dominate the market and meet the federal Renewable Fuel Standard (RFS) targets for advanced biofuels. Further analyses suggest that United States bioenergy studies should include estimates of export demand for biomass in their projections, and that GHG-limiting policy would partially shield both …
Date:
July 1, 2013
Creator:
Jacobson, Jacob J. & Jeffers, Robert
System:
The UNT Digital Library
Competition between fusion and quasi-fission in heavy ion induced reactions
Quantitative analyses of angular distributions and angle-mass correlations have been applied to the U + Ca reaction to obtain upper limit estimates for the cross sections for complete fusion near or below the interaction barrier. Extrapolating to the systems Ca + Cm and Ca + Es using the well established scaling properties of the extra push model, an estimate of the cross sections relevant to the efforts of synthesizing super-heavy elements in the region Z = 116 and N = 184 via heavy-ion fusion reactions are obtained. A simple evaporation calculation using properties of the super heavy elements shows that the failure to observe super-heavy elements with the Ca + Cm reaction is consistent with estimates of the complete fusion process. 33 refs., 9 figs., 1 tab.
Date:
September 1, 1986
Creator:
Back, B. B.
System:
The UNT Digital Library
Oblate-prolate shape competition in Z = 34 to 38 nuclei
Now magic numbers for deformed shapes are established at N and Z of 38 and N of 60. These shell gaps at large deformation (..beta.. approx. = 0.4) are magic when the proton and neutron shell gaps reinforce each other. Other shell gaps for 34 and 36 are predicted to be important for oblate deformation. The competition between these oblate and the 38 prolate gaps as well as the 40 spherical shell gap are considered. In /sup 71/Se coexistence of oblate (..beta.. approx. = -0.24) and large prolate (..beta.. approx. = 0.4) shapes are observed. In /sup 72/Se the excited prolate band with large deformation which coexists with the near-spherical ground state is found to dominate the yrast spectrum to 28/sup +/. The moment of inertia of this band is essentially that of a rigid body. This moment of inertia supports the suggestion that the ''super deformation'', ..beta.. approx. = 0.4, being observed in this region may be associated with a collapse of pairing.
Date:
September 1, 1987
Creator:
Hamilton, J. H.; Ramayya, A. V.; Zhao, X.; Maguire, C. F.; Ma, W. C.; KormickI, J. et al.
System:
The UNT Digital Library
Competition among autoionization, predissociation, and ion-pair formation in molecular hydrogen
We have investigated autoionization, predissociation, and ion-pair formation highly excited states of molecular hydrogen by using double-resonance excitation via the E,F [sup 1][Sigma][sub g][sup +], v=6 level. The energetic threshold for ion-pair formation occurs just below the H[sub 2][sup +] [times] [sup 2][Sigma][sub g][sup +], v[sup +]=9 ionization threshold. The spectrum in this region was studied by using conventional and constant-ionic-state photoelectron spectroscopy, by monitoring the H[sup [minus]] production, and by detecting dissociation products by ionization with a third laser. The decay dynamics in this region are extremely rich, because the excited levels may decay by rotational and vibrational autoionization, by predissociation to neutral H + H* (n=2,3,4), by predissociation to the ion pair H[sup +] + H[sup [minus]], and by fluorescence. In addition, the dissociative potential curve of the 2p[sigma][sub u]3s[sigma][sub g] [sup 1][Sigma][sub u][sup +] doubly excited electronic state crosses the H[sub 2][sup +] [times] [sup 2][Sigma][sub g][sup +] potential curve in the same energy ion, and the electronic autoionization of this state is found to significantly influence these decay processes.
Date:
January 1, 1993
Creator:
Dehmer, J. L.; Dehmer, P. M.; Pratt, S. T. & McCormack, E. F.
System:
The UNT Digital Library
On a family of iterated integrals
This article discusses a family of iterated integrals and generalizing an iterated integral identity proposed at a Putnam competition in 1941.
Date:
2013
Creator:
Anghel, Nicolae
System:
The UNT Digital Library
Projecting on polynomial solutions of second order partial differential operators
Article discussing projecting on polynomial solutions of second order partial differential operators.
Date:
June 2007
Creator:
Anghel, Nicolae
System:
The UNT Digital Library
The Spectroscopy of {sup 183}Tl: An Extreme Case of Prolate-Oblate Shape-Competition
The yrast sequence in {sup 183}Tl has been studied for the first time in recoil-mass and decay tagged gamma-ray spectroscopic measurements. A rotational-like cascade of seven transitions is observed down to the bandhead with spin 13/2+. In contrast to adjacent nuclei, links from the yrast band to a lower lying weakly deformed (oblate) structure are not observed. It appears that the prolate energy minimum in {sup 183}Tl drops significantly compared to {sup 185}Tl and minimizes below the neutron i13/2 midshell (n <= 102). Possibilities for the decay out of the band in {sup 183}Tl are discussed.
Date:
August 10, 1998
Creator:
Batchelder, J.C.; Bingham, C.R.; Carpenter, M.P.; Cizewski, J.A.; Gross, C.J.; Helariutta, K. et al.
System:
The UNT Digital Library
Population of superdeformed bands, the competition with fission, and the barrier between normal and superdeformed states
In this paper we report on the entry points leading to superdeformed (SD) as well as normal bands. We find that, compared to normal bands, the entry spins for the SD bands are about 9 {h bar} higher, and the entry excitation energy 1--3 MeV colder. We also conclude that population of the SD bands represents successful competition against fission. SD bands in both the Dy and Hg regions are considered.
Date:
January 1, 1990
Creator:
Khoo, T. L.; Janssens, R. V. F.; Moore, E. F.; Ahmad, I.; Carpenter, M. P.; Chasman, R. R. et al.
System:
The UNT Digital Library
Assistive Technology Use by Students with Disabilities at UNT
Paper discusses study on assistive technology use by students with physical disabilities, including visual and hearing impairments, at the University of North Texas.
Date:
2007
Creator:
Chabot, Monique
System:
The UNT Digital Library
On the dynamics of a size-structured intraspecific competition model with density dependent juvenile growth rates
In this paper we consider a model of size-structured, intraspecific competition in which increased competition during juvenile growth reduces size at adulthood and thereby reduces adult fertility. Our goal here is to derive a model which is simple enough to be as analytically tractable as possible, and yet still capture these essential features. We wish to understand the asymptotic dynamics of the model and to draw some conclusions about the stabilizing or destabilizing effects of this kind of intraspecific competitive interaction. 17 refs., 3 figs.
Date:
May 1, 1990
Creator:
Cushing, J.M. (Arizona Univ., Tucson, AZ (USA). Interdisciplinary Program in Applied Mathematics) & Li, Jia (Los Alamos National Lab., NM (USA))
System:
The UNT Digital Library
Nonlinearity with disorder: Spatio-temporal complex behavior arising from length scales competition
One of the many mechanisms underlying complex behavior in physical systems is competition between different length or time scales, which may arise naturally in the considered system or may be imposed by external influences. The purpose of this paper is the following. By means of three examples the authors will illustrate how identification of relevant length scales can lead to a separation of the system behavior in two regimes. Far from the competition region, it can be described in very simple ways, usually involving a few degrees of freedom. On the contrary, when relevant scales are in conflict, the behavior of the system turns out to be complex, typically chaotic. Therefore, the success of this approach is that it goes straightforwardly to the deep reasons for complex behavior, making amenable to analytical studies all other regimes.
Date:
September 20, 1993
Creator:
Sanchez, A. & Bishop, A. R.
System:
The UNT Digital Library