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332 Matching Results
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Evaluation of Climate Change Impacts on Wetland Vegetation in the Dunhuang Yangguan National Nature Reserve in Northwest China Using Landsat Derived NDVI
This article uses 41 Landsat images between 1988 and 2016 to calculate the normalized difference vegetation indices (NVDIs) of the wetland vegetation at Xitugou (XTG) and Wowachi (WWC) inside the Dunhuang Yangguan National Nature Reserve in northwest China in order to assess the impacts of climate change on wetland vegetation.
Date:
May 10, 2018
Creator:
Pan, Feifei; Xie, Jianping; Lin, Juming; Zhao, Tingwei; Ji, Yongyuan; Hu, Qi et al.
Object Type:
Article
System:
The UNT Digital Library
Federal Laws Relating to Cybersecurity: Discussion of Proposed Revisions
This report discusses how the current legislative framework for cybersecurity might need to be revised.
Date:
May 10, 2012
Creator:
Fischer, Eric A.
Object Type:
Report
System:
The UNT Digital Library
The Proposed AT&T/T-Mobile Merger: Would It Create a Virtuous Cycle or a Vicious Cycle?
This report discusses the pros and cons of a proposed AT&T and T-Mobile merger. The largest con would be that the merged company would have over 70% of the cell phone market share. The largest pro would be that a merged company would be able to provide better service to its customers. The report also gives a brief overview of the mobile phone industry as a whole.
Date:
May 10, 2011
Creator:
Goldfarb, Charles B.
Object Type:
Report
System:
The UNT Digital Library
The Naples Monitor (Naples, Tex.), Vol. 126, No. 14, Ed. 1 Thursday, May 10, 2012
Weekly newspaper from Naples, Texas that includes local, state and national news along with advertising.
Date:
May 10, 2012
Creator:
Craig, Morris
Object Type:
Newspaper
System:
The Portal to Texas History
Recruiting and Retention: An Overview of FY2011 and FY2012 Results for Active and Reserve Component Enlisted Personnel
None
Date:
May 10, 2013
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Retrocausal Effects as a Consequence of Quantum Mechanics Refined to Accommodate the Principle of Sufficient Reason
The principle of sufficient reason asserts that anything that happens does so for a reason: no definite state of affairs can come into being unless there is a sufficient reason why that particular thing should happen. This principle is usually attributed to Leibniz, although the first recorded Western philosopher to use it was Anaximander of Miletus. The demand that nature be rational, in the sense that it be compatible with the principle of sufficient reason, conflicts with a basic feature of contemporary orthodox physical theory, namely the notion that nature's response to the probing action of an observer is determined by pure chance, and hence on the basis of absolutely no reason at all. This appeal to pure chance can be deemed to have no rational fundamental place in reason-based Western science. It is argued here, on the basis of the other basic principles of quantum physics, that in a world that conforms to the principle of sufficient reason, the usual quantum statistical rules will naturally emerge at the pragmatic level, in cases where the reason behind nature's choice of response is unknown, but that the usual statistics can become biased in an empirically manifest way when the reason for …
Date:
May 10, 2011
Creator:
Stapp, Henry P.
Object Type:
Article
System:
The UNT Digital Library
Collisionality Scaling of Main-ion Toroidal and Poloidal Rotation in Low Torque DIII-D Plasmas
In tokamak plasmas with low levels of toroidal rotation, the radial electric fi eld Er is a combination of pressure gradient and toroidal and poloidal rotation components, all having similar magnitudes. In order to assess the validity of neoclassical poloidal rotation theory for determining the poloidal rotation contribution to Er , Dα emission from neutral beam heated tokamak discharges in DIII-D [J.L. Luxon, Nucl. Fusion 42 , 614 (2002)] has been evaluated in a sequence of low torque (electron cyclotron resonance heating and balanced diagnostic neutral beam pulse) discharges to determine the local deuterium toroidal rotation velocity. By invoking the radial force balance relation the deuterium poloidal rotation can be inferred. It is found that the deuterium poloidal low exceeds the neoclassical value in plasmas with collisionality #23;#3; νi < 0: 1, being more ion diamagnetic, and with a stronger dependence on collisionality than neoclassical theory predicts. At low toroidal rotation, the poloidal rotation contribution to the radial electric fi eld and its shear is signi cant. The eff ect of anomalous levels of poloidal rotation on the radial electric fi eld and cross fi eld heat transport is investigated for ITER parameters.
Date:
May 10, 2013
Creator:
Grierson, B. A.; Burrell, K. H.; Solomon, W. M.; Budny, R. V. & Candy, J.
Object Type:
Report
System:
The UNT Digital Library
Longitudinal Emittance Growth Due to Nonlinear Space Charge Effect
None
Date:
May 10, 2012
Creator:
Lau, Y. Y.; Yu, S. S.; Barnard, J. J. & Seidl, P. A.
Object Type:
Article
System:
The UNT Digital Library
HIGH-RESOLUTION ATMOSPHERIC ENSEMBLE MODELING AT SRNL
The High-Resolution Mid-Atlantic Forecasting Ensemble (HME) is a federated effort to improve operational forecasts related to precipitation, convection and boundary layer evolution, and fire weather utilizing data and computing resources from a diverse group of cooperating institutions in order to create a mesoscale ensemble from independent members. Collaborating organizations involved in the project include universities, National Weather Service offices, and national laboratories, including the Savannah River National Laboratory (SRNL). The ensemble system is produced from an overlapping numerical weather prediction model domain and parameter subsets provided by each contributing member. The coordination, synthesis, and dissemination of the ensemble information are performed by the Renaissance Computing Institute (RENCI) at the University of North Carolina-Chapel Hill. This paper discusses background related to the HME effort, SRNL participation, and example results available from the RENCI website.
Date:
May 10, 2011
Creator:
Buckley, R.; Werth, D.; Chiswell, S. & Etherton, B.
Object Type:
Article
System:
The UNT Digital Library
A COMPREHENSIVE ANALYSIS OF CHLORINE TRANSPORT AND FATE FOLLOWING A LARGE ENVIRONMENTAL RELEASE
A train derailment occurred in Graniteville, South Carolina during the early morning of January 6, 2005, and resulted in the release of a large amount of cryogenic pressurized liquid chlorine to the environment in a short time period. A comprehensive evaluation of the transport and fate of the released chlorine was performed, accounting for dilution, diffusion, transport and deposition into the local environment. This involved the characterization of a three-phased chlorine release, a detailed determination of local atmospheric mechanisms acting on the released chlorine, the establishment of atmospheric-hydrological physical exchange mechanisms, and aquatic dilution and mixing. This presentation will provide an overview of the models used in determining the total air-to-water mass transfer estimated to have occurred as a result of the roughly 60 tons of chlorine released into the atmosphere from the train derailment. The assumptions used in the modeling effort will be addressed, along with a comparison with available observational data to validate the model results. Overall, model-estimated chlorine concentrations in the airborne plume compare well with human and animal exposure data collected in the days after the derailment.
Date:
May 10, 2011
Creator:
Buckley, R.; Hunter, C.; Werth, D.; Chen, K.; Whiteside, M. & Mazzola, C.
Object Type:
Article
System:
The UNT Digital Library
Fuel from Bacteria, CO2, Water, and Solar Energy
Advanced Research Projects Agency-Energy project sheet summarizing general information about a new program to generate liquid fuels from bacteria, carbon dioxide, water, and sunlight (project title "Engineering a Bacterial Reverse Fuel Cell") including critical needs, innovation and advantages, impacts, and contact information. This sheet is the first open solicitation, announcing funding opportunities for involvement in the project.
Date:
May 10, 2012
Creator:
Harvard Medical School. Wyss Institute
Object Type:
Text
System:
The UNT Digital Library
BLENDING ANALYSIS FOR RADIOACTIVE SALT WASTE PROCESSING FACILITY
Savannah River National Laboratory (SRNL) evaluated methods to mix and blend the contents of the blend tanks to ensure the contents are properly blended before they are transferred from the blend tank such as Tank 21 and Tank 24 to the Salt Waste Processing Facility (SWPF) feed tank. The tank contents consist of three forms: dissolved salt solution, other waste salt solutions, and sludge containing settled solids. This paper focuses on developing the computational model and estimating the operation time of submersible slurry pump when the tank contents are adequately blended prior to their transfer to the SWPF facility. A three-dimensional computational fluid dynamics approach was taken by using the full scale configuration of SRS Type-IV tank, Tank 21H. Major solid obstructions such as the tank wall boundary, the transfer pump column, and three slurry pump housings including one active and two inactive pumps were included in the mixing performance model. Basic flow pattern results predicted by the computational model were benchmarked against the SRNL test results and literature data. Tank 21 is a waste tank that is used to prepare batches of salt feed for SWPF. The salt feed must be a homogeneous solution satisfying the acceptance criterion of …
Date:
May 10, 2012
Creator:
Lee, S.
Object Type:
Article
System:
The UNT Digital Library
Mode-Locked Multichromatic X-Rays in a Seeded Free-Electron Laser for Single-Shot X-Ray Spectroscopy
We present the promise of generating gigawatt mode-locked multichromatic x rays in a seeded free-electron laser (FEL). We show that, by using a laser to imprint periodic modulation in electron beam phase space, a single-frequency coherent seed can be amplified and further translated to a mode-locked multichromatic output in an FEL. With this configuration the FEL output consists of a train of mode-locked ultrashort pulses which span a wide frequency gap with a series of equally spaced sharp lines. These gigawatt multichromatic x rays may potentially allow one to explore the structure and dynamics of a large number of atomic states simultaneously. The feasibility of generating mode-locked x rays ranging from carbon K edge ({approx}284 eV) to copper L{sub 3} edge ({approx}931 eV) is confirmed with numerical simulation using the realistic parameters of the linac coherent light source (LCLS) and LCLS-II. We anticipate that the mode-locked multichromatic x rays in FELs may open up new opportunities in x-ray spectroscopy (i.e. resonant inelastic x-ray scattering, time-resolved scattering and spectroscopy, etc.).
Date:
May 10, 2012
Creator:
Xiang, Dao; Ding, Yuantao; Raubenheimer, Tor & Wu, Juhao
Object Type:
Article
System:
The UNT Digital Library
SIMULATION OF THE ICELAND VOLCANIC ERUPTION OF APRIL 2010 USING THE ENSEMBLE SYSTEM
The Eyjafjallajokull volcanic eruption in Iceland in April 2010 disrupted transportation in Europe which ultimately affected travel plans for many on a global basis. The Volcanic Ash Advisory Centre (VAAC) is responsible for providing guidance to the aviation industry of the transport of volcanic ash clouds. There are nine such centers located globally, and the London branch (headed by the United Kingdom Meteorological Office, or UKMet) was responsible for modeling the Iceland volcano. The guidance provided by the VAAC created some controversy due to the burdensome travel restrictions and uncertainty involved in the prediction of ash transport. The Iceland volcanic eruption provides a useful exercise of the European ENSEMBLE program, coordinated by the Joint Research Centre (JRC) in Ispra, Italy. ENSEMBLE, a decision support system for emergency response, uses transport model results from a variety of countries in an effort to better understand the uncertainty involved with a given accident scenario. Model results in the form of airborne concentration and surface deposition are required from each member of the ensemble in a prescribed format that may then be uploaded to a website for manipulation. The Savannah River National Laboratory (SRNL) is the lone regular United States participant throughout the 10-year …
Date:
May 10, 2011
Creator:
Buckley, R.
Object Type:
Article
System:
The UNT Digital Library
Biofuels from E. coli
Advanced Research Projects Agency-Energy project sheet summarizing general information about the Electrofuels program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses the modification of E. coli to consume carbon dioxide and produce liquid fuel as part of the "Engineering E. coli as an Electrofuels Chassis for Isooctane Production" project.
Date:
May 10, 2012
Creator:
Ginkgo Bioworks
Object Type:
Text
System:
The UNT Digital Library
Genetically Modified Bacteria for Fuel Production
Advanced Research Projects Agency-Energy project sheet summarizing general information about the Electrofuels program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses a new program to develop a bacteria that uses electricity to convert carbon dioxide into liquid fuels as part of the "Development of Rhodobacter as a Versatile Platform for Fuels Production" project.
Date:
May 10, 2012
Creator:
Pennsylvania State University
Object Type:
Text
System:
The UNT Digital Library
Scharz Preconditioners for Krylov Methods: Theory and Practice
Several numerical methods were produced and analyzed. The main thrust of the work relates to inexact Krylov subspace methods for the solution of linear systems of equations arising from the discretization of partial di#11;erential equa- tions. These are iterative methods, i.e., where an approximation is obtained and at each step. Usually, a matrix-vector product is needed at each iteration. In the inexact methods, this product (or the application of a preconditioner) can be done inexactly. Schwarz methods, based on domain decompositions, are excellent preconditioners for thise systems. We contributed towards their under- standing from an algebraic point of view, developed new ones, and studied their performance in the inexact setting. We also worked on combinatorial problems to help de#12;ne the algebraic partition of the domains, with the needed overlap, as well as PDE-constraint optimization using the above-mentioned inexact Krylov subspace methods.
Date:
May 10, 2013
Creator:
Szyld, Daniel B.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Daniel Graney to Al Daniels about contact information]
Letter from Daniel Graney to Al Daniels on March 10, 2010, discussing Christopher Forbich's contact information and TSDC convention booth.
Date:
May 10, 2010
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Versatile Transportation Energy Solutions
Advanced Research Projects Agency-Energy project sheet summarizing general information about the 13 projects that are a part of the Electrofuels program including project goals, innovation needs, and potential impacts.
Date:
May 10, 2012
Creator:
United States. Advanced Research Projects Agency-Energy.
Object Type:
Text
System:
The UNT Digital Library
Design of the Energy Partitioning Energy Coupling (EPEC) NIF Experiment
None
Date:
May 10, 2013
Creator:
Kane, J. O.; Brooksby, C. A.; Brown, C. G.; Compton, S. M.; Dunlop, W. H.; Fournier, K. B. et al.
Object Type:
Report
System:
The UNT Digital Library
Extension of the Supercritical Carbon Dioxide Brayton Cycle to Low Reactor Power Operation: Investigations Using the Coupled Anl Plant Dynamics Code-sas4a/Sassys-1 Liquid Metal Reactor Code System.
Significant progress has been made on the development of a control strategy for the supercritical carbon dioxide (S-CO{sub 2}) Brayton cycle enabling removal of power from an autonomous load following Sodium-Cooled Fast Reactor (SFR) down to decay heat levels such that the S-CO{sub 2} cycle can be used to cool the reactor until decay heat can be removed by the normal shutdown heat removal system or a passive decay heat removal system such as Direct Reactor Auxiliary Cooling System (DRACS) loops with DRACS in-vessel heat exchangers. This capability of the new control strategy eliminates the need for use of a separate shutdown heat removal system which might also use supercritical CO{sub 2}. It has been found that this capability can be achieved by introducing a new control mechanism involving shaft speed control for the common shaft joining the turbine and two compressors following reduction of the load demand from the electrical grid to zero. Following disconnection of the generator from the electrical grid, heat is removed from the intermediate sodium circuit through the sodium-to-CO{sub 2} heat exchanger, the turbine solely drives the two compressors, and heat is rejected from the cycle through the CO{sub 2}-to-water cooler. To investigate the effectiveness …
Date:
May 10, 2012
Creator:
Moisseytsev, A. & Sienicki, J. J. (Nuclear Engineering Division)
Object Type:
Report
System:
The UNT Digital Library
LITERATURE REVIEW ON IMPACT OF GLYCOLATE ON THE 2H EVAPORATOR AND THE EFFLUENT TREATMENT FACILITY
Glycolic acid (GA) is being studied as an alternate reductant in the Defense Waste Processing Facility (DWPF) feed preparation process. It will either be a total or partial replacement for the formic acid that is currently used. A literature review has been conducted on the impact of glycolate on two post-DWPF downstream systems - the 2H Evaporator system and the Effluent Treatment Facility (ETF). The DWPF recycle stream serves as a portion of the feed to the 2H Evaporator. Glycolate enters the evaporator system from the glycolate in the recycle stream. The overhead (i.e., condensed phase) from the 2H Evaporator serves as a portion of the feed to the ETF. The literature search revealed that virtually no impact is anticipated for the 2H Evaporator. Glycolate may help reduce scale formation in the evaporator due to its high complexing ability. The drawback of the solubilizing ability is the potential impact on the criticality analysis of the 2H Evaporator system. It is recommended that at least a theoretical evaluation to confirm the finding that no self-propagating violent reactions with nitrate/nitrites will occur should be performed. Similarly, identification of sources of ignition relevant to glycolate and/or update of the composite flammability analysis to …
Date:
May 10, 2012
Creator:
Adu-Wusu, K.
Object Type:
Report
System:
The UNT Digital Library
Texas Register, Volume 38, Number 19, Pages 2807-2920, May 10, 2013
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
May 10, 2013
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Greensheet (Fort Worth, Tex.), Vol. 36, No. 39, Ed. 1 Thursday, May 10, 2012
Free weekly newspaper that includes business and classified advertising.
Date:
May 10, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History