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5,312 Matching Results
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On Cratering: A Brief History, Analysis, and Theory of Cratering
Cratering is a subject that has been studied by many investigators for many years for many purposes. These purposes range from experimental studies of physical properties to large scale excavations using explosive charges of kiloton size. In the past ten years considerable effort has been devoted to cratering experiments for the purposes of determining the effects of cratering by nuclear explosions, with recent accent on Plowshare applications. From the large amount of data available for craters in alluvian has been possible to establish very reliable relationships between charge size, depth of bursty crater radii, and crater depths. In addition it has been possible to construct a preliminary theory of the mechanics of explosive crater formation. The available experimental data for nuclear and high explosive craters are reviewed, with particular emphasis on the data for desert alluvium, and the pertinent relationships are derived. A theory of the important cratering mechanisms, which has been evolved on the basis of these data and data from other sources, is outlined. (auth)
Date:
August 22, 1961
Creator:
Nordyke, M. D.
Object Type:
Report
System:
The UNT Digital Library
Inertial-confinement-fusion applications of ion-stopping theory
Methods were developed to calculate: (1) the stopping power of a hot plasma target, (2) the charge-state of a fast ion projectile, and (3) the final disposition of the deposited energy. The first issue refers to the stopping power for protons. The proton stopping power is altered in high-density or high-temperature targets, especially at velocities below the stopping peak. The second issue concerns the application of a proton stopping curve to the arbitrary projectile. The third topic is more specialized to inertial fusion and concerns the partition of deposited energy between ion (nuclear motion) degrees of freedom and those corresponding to bound and free electrons. The question here is whether a thermal equilibrium plasma is produced.
Date:
January 22, 1982
Creator:
More, Richard M.; Lee, Yim T. & Bailey, David S.
Object Type:
Article
System:
The UNT Digital Library
A Two-Coordinate Nickel Imido Complex That Effects C-H Amination
This article discusses a two-coordinate nickel imido complex that effects C-H amination.
Date:
December 22, 2010
Creator:
Laskowski, Carl A.; Miller, Alexander J.M.; Hillhouse, Gregory L. & Cundari, Thomas R., 1964-
Object Type:
Article
System:
The UNT Digital Library
Application of the FORSS sensitivity code system to fast reactor analysis
The FORSS Sensitivity Analysis Code System is described in terms of its objectives and present capabilities. An example is made of a problem specified by the Processing Methods Testing Subcommittee of the Code Evaluation Working Group, i.e., the determination of integral parameters, sensitivities to cross- section data, methods and data uncertainties, and required cross-section accuracies for an infinite media of ZPR 6/7 core composition. (auth)
Date:
October 22, 1975
Creator:
Weisbin, C. R.; Oblow, E. M. & Mynatt, F. R.
Object Type:
Article
System:
The UNT Digital Library
A concurrent, multigroup, discrete ordinates model of neutron transport
The authors present an algorithm for the concurrent solution of the linear system arising from a multigroup, discrete ordinates model of neutron transport. The target architectures consist of distributed memory computers ranging from workstation clusters to massively parallel computers. Based on an analysis of the memory requirement and floating point complexity of matrix-vector multiplication in the iterative solution of the linear system, the authors propose a data layout and communication strategy designed to achieve scalability with respect to all phase space variables. Numerical results are presented to demonstrate the performance of the algorithm on the nCUBE/2.
Date:
October 22, 1993
Creator:
Dorr, M. R. & Still, C. H.
Object Type:
Article
System:
The UNT Digital Library
Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model
We propose an importance truncation scheme for the no-core shell model, which enables converged calculations for nuclei well beyond the p-shell. It is based on an a priori measure for the importance of individual basis states constructed by means of many-body perturbation theory. Only the physically relevant states of the no-core model space are considered, which leads to a dramatic reduction of the basis dimension. We analyze the validity and efficiency of this truncation scheme using different realistic nucleon-nucleon interactions and compare to conventional no-core shell model calculations for {sup 4}He and {sup 16}O. Then, we present the first converged calculations for the ground state of {sup 40}Ca within no-core model spaces including up to 16{h_bar}{Omega}-excitations using realistic low-momentum interactions. The scheme is universal and can be easily applied to other quantum many-body problems.
Date:
May 22, 2007
Creator:
Roth, R & Navratil, P
Object Type:
Article
System:
The UNT Digital Library
ORACLE CODE FOR A GENERAL TWO-REGION, TWO-GROUP SPHERICAL HOMOGENEOUS REACTOR CALCULATION
None
Date:
September 22, 1955
Creator:
Fowler, T B
Object Type:
Report
System:
The UNT Digital Library
Two-Group Constants for Aqueous Homogeneous Reactor Calculations
None
Date:
January 22, 1958
Creator:
Fowler, T. B. & Tobias, M.
Object Type:
Report
System:
The UNT Digital Library
Neutron logging in partially saturated media
None
Date:
April 22, 1974
Creator:
Hearst, J. R.
Object Type:
Article
System:
The UNT Digital Library
Experimental investigation of the permeability of Kayenta and St. Peter sandstones to hypersaline brine in the temperature interval 70 to 90/sup 0/C at 10. 3-MPa confining pressure
Permeabilities of 10.2 cm in length, 2.5 cm in diameter Kayenta (porosity, 20.7, +- 1.66%) and St. Peter (porosity, 13.6, +- 0.13%) sandstones to Magmamax No. 1 brine containing suspended solids were determined from 70 to 90/sup 0/C at 10.3-MPa confining pressure. Measurements were performed without filters, with one 10-..mu..m filter, and with two 10-..mu..m filters inserted upstream of the core sample. In all cases, there was a dramatic decrease in permeability within the first hour of flow or few hundred pore volumes of flow through the core. Experiments conducted without filters or with one filter yield permeabilities that represent both the rock and the 2- to 3-mm amorphous silica-iron layer on the top face of the core. The experimental results show that if the Salton Sea Geothermal Field (SSGF) were composed of porous, sedimentary formations similar to Kayenta sandstone, long-term injection of unmodified Magmamax brine would not be feasible. In the case of acidified brine, most of the permeability decline may result from the mobilization of calcite.
Date:
December 22, 1977
Creator:
Piwinskii, A.J. & Netherton, R.
Object Type:
Report
System:
The UNT Digital Library
Threshold detection in generalized non-additive signals and noise
The classical theory of optimum (binary-on-off) threshold detection for additive signals and generalized (i.e. nongaussian) noise is extended to the canonical nonadditive threshold situation. In the important (and usual) applications where the noise is sampled independently, a canonical threshold optimum theory is outlined here, which is found formally to parallel the earlier additive theory, including the critical properties of locally optimum Bayes detection algorithms, which are asymptotically normal and optimum as well. The important Class A clutter model provides an explicit example of optimal threshold envelope detection, for the non-additive cases of signal and noise. Various extensions are noted in the concluding section, as are selected references.
Date:
December 22, 1997
Creator:
Middleton, D., LLNL
Object Type:
Report
System:
The UNT Digital Library
A computational study of the enthalpies of formation of halomethylidynes
Article on a computational study of the enthalpies of formation of halomethylidynes.
Date:
January 22, 1999
Creator:
Marshall, Paul; Misra, Ashutosh & Schwartz, Martin
Object Type:
Article
System:
The UNT Digital Library
Cosmic-ray Propagation and Interactions in the Galaxy
We survey the theory and experimental tests for the propagation of cosmic rays in the Galaxy up to energies of 10{sup 15} eV. A guide to the previous reviews and essential literature is given, followed by an exposition of basic principles. The basic ideas of cosmic-ray propagation are described, and the physical origin of its processes are explained. The various techniques for computing the observational consequences of the theory are described and contrasted. These include analytical and numerical techniques. We present the comparison of models with data including direct and indirect--especially gamma-ray--observations, and indicate what we can learn about cosmic-ray propagation. Some particular important topics including electrons and antiparticles are chosen for discussion.
Date:
January 22, 2007
Creator:
Strong, Andrew W.; /Garching, Max Planck Inst., MPE; Moskalenko, Igor V.; /Stanford U., HEPL /KIPAC, Menlo Park; Ptuskin, Vladimir S. & /Troitsk, IZMIRAN
Object Type:
Article
System:
The UNT Digital Library
Experimental And Theoretical High Energy Physics Research At UCLA
This is the final report of the UCLA High Energy Physics DOE Grant No. DE-FG02- 91ER40662. This report covers the last grant project period, namely the three years beginning January 15, 2010, plus extensions through April 30, 2013. The report describes the broad range of our experimental research spanning direct dark matter detection searches using both liquid xenon (XENON) and liquid argon (DARKSIDE); present (ICARUS) and R&D for future (LBNE) neutrino physics; ultra-high-energy neutrino and cosmic ray detection (ANITA); and the highest-energy accelerator-based physics with the CMS experiment and CERN’s Large Hadron Collider. For our theory group, the report describes frontier activities including particle astrophysics and cosmology; neutrino physics; LHC interaction cross section calculations now feasible due to breakthroughs in theoretical techniques; and advances in the formal theory of supergravity.
Date:
July 22, 2013
Creator:
Cousins, Robert D.
Object Type:
Report
System:
The UNT Digital Library
Three-Dimensional Printed, Dual-Band, Dual-Circularly Polarized Antenna Array Using Gap Waveguide Technology
Article proposes a gap waveguide (GW)-based 4 × 4 dual-band, dual-circularly polarized antenna array. The combination of dual-band, dual-circularly polarized capability, high gain, high efficiency, lightweight, low cost and compact size renders the proposed design a potential candidate for commercial millimeter wave communication applications.
Date:
October 22, 2022
Creator:
Wu, Sifan; Li, Jianxing; Cao, Yuanxi; Yan, Sen; Xu, Kaida & Luyen, Hung
Object Type:
Article
System:
The UNT Digital Library
The Optimist (Abilene, Tex.), Vol. 99, No. 10, Ed. 1 Wednesday, September 22, 2010
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
September 22, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Rhonda Love, November 22, 2019
Audio interview with Rhonda Love, a psychology professor, city council member, and environmental activist from Denton, Texas. Love discusses her involvement with the Denton Drilling Advisory Group and the Frack Free Denton campaign, as well as her thoughts on applied democracy, her teaching career, and recent developments on the Denton City Council.
Date:
November 22, 2019
Creator:
Kuplack, Ian & Love, Rhonda
Object Type:
Sound
System:
The UNT Digital Library
Reata (Abilene, Tex.), Spring 1987
Monthly student magazine published by the newspaper staff of Hardin-Simmons University. According to page 2, "Reata is a non-profit newspaper of Hardin-Simmons University, published as a special edition during the long terms. It is published by the HSU Brand under the direction of the Department of Communication, serving as a laboratory project and a forum of student views."
Date:
April 22, 1987
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Harmonic generation of ion waves due to Brillouin backscattering
We report results of simulations of stimulated Brillouin backscatter in which we see the second spatial harmonic of the ion density fluctuation and compare with linear, fluid theory. We also describe examples of the competition between Raman and Brillouin backscatter. 21 refs., 3 figs.
Date:
May 22, 1985
Creator:
Estabrook, K.; Kruer, W. L. & Haines, M. G.
Object Type:
Article
System:
The UNT Digital Library
A Convergence Analysis of Unconstrained and Bound Constrained Evolutionary Pattern Search
The authors present and analyze a class of evolutionary algorithms for unconstrained and bound constrained optimization on R{sup n}: evolutionary pattern search algorithms (EPSAs). EPSAs adaptively modify the step size of the mutation operator in response to the success of previous optimization steps. The design of EPSAs is inspired by recent analyses of pattern search methods. They show that EPSAs can be cast as stochastic pattern search methods, and they use this observation to prove that EpSAs have a probabilistic weak stationary point convergence theory. This work provides the first convergence analysis for a class of evolutionary algorithms that guarantees convergence almost surely to a stationary point of a nonconvex objective function.
Date:
April 22, 1999
Creator:
Hart, W.E.
Object Type:
Article
System:
The UNT Digital Library
Extracting (n,gamma) direct capture cross sections from Coulomb dissociation: application to 14C(n,gamma)15C
A methodology for extracting neutron direct capture rates from Coulomb Dissociation data is developed and applied to the Coulomb dissociation of {sup 15}C on {sup 208}Pb at 68 MeV/nucleon. Full Continuum Discretized Coupled Channel calculations are performed and an asymptotic normalization coefficient is determined from a fit to the breakup data. Direct neutron capture calculations using the extracted asymptotic normalization coefficient provide (n, {gamma}) cross sections consistent with direct measurements. Our results show that the Coulomb Dissociation data can be reliably used for extracting the cross section for {sup 14}C(n,{gamma}){sup 15}C if the appropriate reaction theory is used. The resulting error bars are of comparable magnitude to those from the direct measurement.
Date:
January 22, 2008
Creator:
Summers, N. C. & Nunes, F. M.
Object Type:
Article
System:
The UNT Digital Library
Air toxics from heavy oil production and consumption
This report assesses the potential impact of recent Federal and state regulations for airborne toxic substances on the production and consumption of heavy fuel oils. Emissions of nickel from heavy oil production in California are considered in some detail, in conjunction with California state regulations for toxic emissions. Although the use of thermal energy from heavy crude oils could in theory be impacted by toxic air pollution regulations, recent trends towards the use of natural gas for the required extraction energy appear to provide substantial relief, in addition to reducing emissions of criteria air pollutants. However, the consumption of residual fuel oils containing toxic metals could result in higher population exposures to these substances and their attendant risks may be worthy of more detailed analysis.
Date:
December 22, 1992
Creator:
Lipfert, F. W.; DePhillips, M. P. & Moskowitz, P. D.
Object Type:
Report
System:
The UNT Digital Library
Information Resources in High-Energy Physics: Surveying the Present Landscape and Charting the Future Course
Access to previous results is of paramount importance in the scientific process. Recent progress in information management focuses on building e-infrastructures for the optimization of the research workflow, through both policy-driven and user-pulled dynamics. For decades, High-Energy Physics (HEP) has pioneered innovative solutions in the field of information management and dissemination. In light of a transforming information environment, it is important to assess the current usage of information resources by researchers and HEP provides a unique test-bed for this assessment. A survey of about 10% of practitioners in the field reveals usage trends and information needs. Community-based services, such as the pioneering arXiv and SPIRES systems, largely answer the need of the scientists, with a limited but increasing fraction of younger users relying on Google. Commercial services offered by publishers or database vendors are essentially unused in the field. The survey offers an insight into the most important features that users require to optimize their research workflow. These results inform the future evolution of information management in HEP and, as these researchers are traditionally 'early adopters' of innovation in scholarly communication, can inspire developments of disciplinary repositories serving other communities.
Date:
April 22, 2008
Creator:
Gentil-Beccot, Anne; Mele, Salvatore; Holtkamp, Annette; O'Connell, Heath B. & Brooks, Travis C.
Object Type:
Article
System:
The UNT Digital Library
ICRF heating and current drive in TFTR supershot plasmas: Data analysis and interpretation of ICRF/edge interactions. Research Progress report
The relevance of rf-sheath-plasma interactions to ICRF operation in TFTR has been studied. Screen-screen and screen-limiter rf sheaths have been identified and analyzed for the old and new Bay M geometries on TFIR, including sheath voltages driven by both feeders and the central antenna conductor. Calculations have been carried out to determine the effects of ICRF on edge transport (profile flattening by E {times} B convection), impurity influx ({delta}Z{sub eff}) and edge electron heating (FS glow phenomena) as a function of edge plasma parameters, rf power and antenna phasing. It was found that many of the experimentally observed ICRF-edge plasma interactions on TFIR are consistent with the predictions of rf sheath theory.
Date:
September 22, 1993
Creator:
Aamodt, R. E.; D`Ippolito, D. A. & Myra, J. R.
Object Type:
Report
System:
The UNT Digital Library