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737 Matching Results
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Active RF Pulse Compression Using An Electrically Controlled Semiconductor Switch
First we review the theory of active pulse compression systems using resonant delay lines. Then we describe the design of an electrically controlled semiconductor active switch. The switch comprises an active window and an overmoded waveguide three-port network. The active window is based on a four-inch silicon wafer which has 960 PIN diodes. These are spatially combined in an overmoded waveguide. We describe the philosophy and design methodology for the three-port network and the active window. We then present the results of using this device to compress 11.4 GHz RF signals with high compression ratios. We show how the system can be used with amplifier like sources, in which one can change the phase of the source by manipulating the input to the source. We also show how the active switch can be used to compress a pulse from an oscillator like sources, which is not possible with passive pulse compression systems.
Date:
January 10, 2007
Creator:
Guo, Jiquan & Tantawi, Sami
Object Type:
Article
System:
The UNT Digital Library
Advanced Communication and Control Solutions of Distributed Energy Resources (DER)
This report covers work performed in Phase II of a two phase project whose objective was to demonstrate the aggregation of multiple Distributed Energy Resources (DERs) and to offer them into the energy market. The Phase I work (DE-FC36-03CH11161) created an integrated, but distributed, system and procedures to monitor and control multiple DERs from numerous manufacturers connected to the electric distribution system. Procedures were created which protect the distribution network and personnel that may be working on the network. Using the web as the communication medium for control and monitoring of the DERs, the integration of information and security was accomplished through the use of industry standard protocols such as secure SSL,VPN and ICCP. The primary objective of Phase II was to develop the procedures for marketing the power of the Phase I aggregated DERs in the energy market, increase the number of DER units, and implement the marketing procedures (interface with ISOs) for the DER generated power. The team partnered with the Midwest Independent System Operator (MISO), the local ISO, to address the energy market and demonstrate the economic dispatch of DERs in response to market signals. The selection of standards-based communication technologies offers the ability of the system …
Date:
January 10, 2007
Creator:
Asgeirsson, Haukur; Seguin, Richard; Sherding, Cameron; de Bruet, Andre, G.; Broadwater, Robert & Dilek, Murat
Object Type:
Report
System:
The UNT Digital Library
Afro-Latinos in Latin America and Considerations for U.S. Policy
This report reviews and analyzes the situation, concerns, and activities of Afro-descendants in the Spanish- and Portuguese-speaking nations of Latin America. It then discusses current U.S. foreign aid programs, as well as multilateral initiatives, that have directly or indirectly assisted Afro-Latinos. The report concludes with a discussion of potential policy options that have been proposed should the United States elect to provide further support for Afro-Latinos.
Date:
January 10, 2007
Creator:
Ribando, Clare M.
Object Type:
Report
System:
The UNT Digital Library
The Alternative Minimum Tax for Individuals: Legislative Initiatives in the 110th Congress
This report discusses the alternative minimum tax (AMT) for individuals that was originally enacted to ensure that all taxpayers, especially high-income taxpayers, pay at least a minimum amount of federal taxes.
Date:
January 10, 2007
Creator:
Esenwein, Gregg A.
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 108, No. 244, Ed. 1 Wednesday, January 10, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 10, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Aluminum Rayleigh Taylor Strength Measurements and Calculations
A traditional approach to the study of material strength has been revitalized at the Russian Federal Nuclear Center (VNIIEF). Rayleigh Taylor strength experiments have long been utilized to measure the material response of metals at high pressure and strain rates. A modulated (sinusoidal or sawtooth perturbation) surface is shocklessly (quasi-isentropically) accelerated by a high explosive (HE) driver, and radiography is used to measure the perturbation amplitude as a function of time. The Aluminum T-6061 targets are designed with several sets of two-dimensional sawtooth perturbations machined on the loading surface. The HE driver was designed to reach peak pressures in the range of 200 to 300 kbar and strain rates in the range of 10{sup 4} - 10{sup 6} s{sup -1}. The standard constitutive strength models, Steinberg-Guinan (SG) [1], Steinberg-Lund (SL) [2], Preston-Tonks-Wallace (PTW) [3], Johnson-Cooke (JC) [4], and Mechanical Threshold Stress (MTS) [5], have been calibrated by traditional techniques: (Hopkinson-Bar, Taylor impact, flyer plate/shock-driven experiments). The VNIIEF experimental series accesses a strain rate regime not attainable using traditional methods. We have performed a detailed numerical study with a two-dimensional Arbitrary Lagrangian Eulerian hydrodynamics computer code containing several constitutive strength models to predict the perturbation growth. Results show that the capabilities …
Date:
January 10, 2007
Creator:
Lindquist, M. J.; Cavallo, R. M.; Lorenz, K. T.; Pollaine, S. M.; Remington, B. A. & Raevsky, V. A.
Object Type:
Article
System:
The UNT Digital Library
Assessment of gradient-diffusion closures for modeling Rayleigh-Taylor and Richtmyer-Meshkov instability-induced mixing
The validity of gradient-diffusion closures for modeling turbulent transport in multi-mode Rayleigh-Taylor and reshocked Richtmyer-Meshkov instability-induced mixing is investigated using data from three-dimensional spectral/tenth-order compact difference and ninth-order weighted essentially non-oscillatory simulations, respectively. Details on the numerical methods, initial and boundary conditions, and validation of the results are discussed elsewhere [2, 3]. First, mean and fluctuating fields are constructed using spatial averaging in the two periodic flow directions. Then, quantities entering eddy viscosity-type gradient-diffusion closures, such as the turbulent kinetic energy and its dissipation rate (or turbulent frequency), and the turbulent viscosity are constructed. The magnitudes of the terms in the turbulent kinetic energy transport equation are examined to identify the dominant processes. It is shown that the buoyancy (or shock) production term is the dominant term in the transport equation, and that the shear production term is relatively small for both the Rayleigh-Taylor and Richtmyer-Meshkov cases. Finally, a priori tests of gradient-diffusion closures of the unclosed terms in the turbulent kinetic energy transport equation are performed by comparing the terms constructed directly using the data to the modeled term. A simple method for estimating the turbulent Schmidt numbers appearing in the closures is proposed. Using these turbulent Schmidt numbers, …
Date:
January 10, 2007
Creator:
Schilling, O; Mueschke, N & Latini, M
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 45, Ed. 1 Wednesday, January 10, 2007
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 10, 2007
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Catalytic Synthesis of Arylisocyanates from Nitroaromatics. A Computational Study
Article discussing a computational study on the catalytic synthesis of arylisocyanates from nitroaromatics.
Date:
January 10, 2007
Creator:
Kazi, Abul B.; Cundari, Thomas R., 1964-; Baba, Eduard; DeYonker, Nathan J.; Dinescu, Adriana & Spaine, Lloyd
Object Type:
Article
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 157, No. 47, Ed. 1 Wednesday, January 10, 2007
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
January 10, 2007
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 112, No. 2, Ed. 1 Wednesday, January 10, 2007
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
January 10, 2007
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 25, No. 49, Ed. 1 Wednesday, January 10, 2007
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
January 10, 2007
Creator:
Crimmins, Blaine
Object Type:
Newspaper
System:
The Portal to Texas History
The Columbia River Protection Supplemental Technologies Quality Assurance Project Plan
The U.S. Department of Energy (DOE) has conducted interim groundwater remedial activities on the Hanford Site since the mid-1990s for several groundwater contamination plumes. DOE established the Columbia River Protection Supplemental Technologies Project (Technologies Project) in 2006 to evaluate alternative treatment technologies. The objectives for the technology project are as follows: develop a 300 Area polyphosphate treatability test to immobilize uranium, design and test infiltration of a phosphate/apatite technology for Sr-90 at 100-N, perform carbon tetrachloride and chloroform attenuation parameter studies, perform vadose zone chromium characterization and geochemistry studies, perform in situ biostimulation of chromium studies for a reducing barrier at 100-D, and perform a treatability test for phytoremediation for Sr-90 at 100-N. This document provides the quality assurance guidelines that will be followed by the Technologies Project. This Quality Assurance Project Plan is based on the quality assurance requirements of DOE Order 414.1C, Quality Assurance, and 10 CFR 830, Subpart A--Quality Assurance Requirements as delineated in Pacific Northwest National Laboratory’s Standards-Based Management System. In addition, the technology project is subject to the Environmental Protection Agency (EPA) Requirements for Quality Assurance Project Plans (EPA/240/B-01/003, QA/R-5). The Hanford Analytical Services Quality Assurance Requirements Documents (HASQARD, DOE/RL-96-68) apply to portions of this …
Date:
January 10, 2007
Creator:
Fix, N. J.
Object Type:
Report
System:
The UNT Digital Library
Comparison of multiple ecogenomics methods for determining ecosystem function in uranium-contaminated environments
Background: Bioremediation may offer the only feasiblestrategy for the nearly intractable problem of metal and radionuclidecontamination of soil and groundwater. To understand bioremediation incontaminated environments, it is critical to determine the organismspresent in these environments, analyze their responses to stressconditions, and elucidate functional position in the environment.Methods: We used multiple molecular techniques on both sediment andgroundwater to develop a better understanding of the functionalcapability and stress level within the microbial community inrelationship to over one hundred geochemical parameters. Due to the lowpH (3.5-4.5) and high contaminant levels (e.g., uranium) microbialdensities and activities were low. We used a phage polymeraseamplification system to construct large and small insert DNA libraries,performed metagenome sequencing, constructed clonal libraries of selectfunctional genes (SSU rRNA gene, nirK, nirS, amoA, pmoA, and dsrAB), useda SSU rDNA Phylochip microarray (9,000 taxa), and a functional gene array(23K genes). A complete comparison for community differences andsimilarities between the different techniques was assessed using severalbioinformatics techniques. Results: SSU rDNA analysis revealed thepresence of distinct bacterial phyla, including proteobacteria,acidobacteria, and planctomycetes along the contaminant gradient.Metagenome analysis identified many of the same organisms, and diversitywas lower in water than sediment. Analysis with functional gene arrays,phylochip, and specific probes for genes and organisms involved inbiogeochemical …
Date:
January 10, 2007
Creator:
Hazen, T. C.; Dehal, P.; Arkin, A. P.; Fields, M. W.; Keller, M.; Zhou, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Creating a New Generation of Software Development Environments, Compilers, and Algorithms for High-Performance Computing, Networks, and Data Management
None
Date:
January 10, 2007
Creator:
Engelen, Robert A. van
Object Type:
Report
System:
The UNT Digital Library
Designing a Multi-Petabyte Database for LSST
The 3.2 giga-pixel LSST camera will produce approximately half a petabyte of archive images every month. These data need to be reduced in under a minute to produce real-time transient alerts, and then added to the cumulative catalog for further analysis. The catalog is expected to grow about three hundred terabytes per year. The data volume, the real-time transient alerting requirements of the LSST, and its spatio-temporal aspects require innovative techniques to build an efficient data access system at reasonable cost. As currently envisioned, the system will rely on a database for catalogs and metadata. Several database systems are being evaluated to understand how they perform at these data rates, data volumes, and access patterns. This paper describes the LSST requirements, the challenges they impose, the data access philosophy, results to date from evaluating available database technologies against LSST requirements, and the proposed database architecture to meet the data challenges.
Date:
January 10, 2007
Creator:
Becla, Jacek; Hanushevsky, Andrew; Nikolaev, Sergei; Abdulla, Ghaleb; Szalay, Alex; Nieto-Santisteban, Maria et al.
Object Type:
Article
System:
The UNT Digital Library
Desorption Behavior of Trichloroethene and Tetrachloroethene in u.s. Department of Energy Savannah River Site Unconfined Aquifer Sediments
Sorption is governed by the physico-chemical processes that partition solutes between the aqueous and solid phases in aquifers. For environmental systems, a linear equilibrium relationship between the amount of contaminant in the alternative phases is often assumed. In this traditional approach, the distribution coefficient, or K{sub d}, is a ratio of contaminant associated with the solid phase to the contaminant in the water phase. Recent scientific literature has documented time-dependant behaviors in which more contaminant mass is held in the solid phase than predicted by the standard model. Depending on the specific conceptualization, this has been referred to as nonlinear sorption, time-variable sorption, or ''irreversible sorption''. The potential impact of time-variable sorption may be beneficial or detrimental depending on the specific conditions and remediation goals. Researchers at the Pacific Northwest National Laboratory (PNNL) have been studying this process to evaluate how various soil types will affect this process for sites contaminated with chlorinated solvents. The results described in this report evaluate sorption-desorption of trichloroethylene (TCE) and tetrachloroethylene (PCE) in Savannah River Site (SRS) soils. The results of this study will be combined with ongoing PNNL research to provide a more comprehensive look at this process and its impact on contaminant …
Date:
January 10, 2007
Creator:
Vangelas, K.; Robert G.; Riley, R.; James E.; Szecsody, J.; Mitroshkov, A. V. et al.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, January 10, 2007
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 10, 2007
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Federal Lands Managed by the Bureau of Land Management (BLM) and the Forest Service: Issues for the 110th Congress
None
Date:
January 10, 2007
Creator:
Gorte, Ross W.; Vincent, Carol Hardy & Humphries, Marc
Object Type:
Report
System:
The UNT Digital Library
Field Theory On the World Sheet: Mean Field Expansion And Cutoff Dependence
Continuing earlier work, we apply the mean field method to the world sheet representation of a simple field theory. In particular, we study the higher order terms in the mean field expansion, and show that their cutoff dependence can be absorbed into a running coupling constant. The coupling constant runs towards zero in the infrared, and the model tends towards a free string. One cannot fully reach this limit because of infrared problems, however, one can still apply the mean field method to the high energy limit (high mass states) of the string.
Date:
January 10, 2007
Creator:
Bardakci, Korkut
Object Type:
Report
System:
The UNT Digital Library
Final Technical Report: Revised
Revised Final Report, requested by Sharon L. Donaldson, Contract Specialist.
Date:
January 10, 2007
Creator:
Mitchell Woodring, PhD & James Christian, PhD
Object Type:
Report
System:
The UNT Digital Library
Focal Plane Metrology for the LSST Camera
Meeting the science goals for the Large Synoptic Survey Telescope (LSST) translates into a demanding set of imaging performance requirements for the optical system over a wide (3.5{sup o}) field of view. In turn, meeting those imaging requirements necessitates maintaining precise control of the focal plane surface (10 {micro}m P-V) over the entire field of view (640 mm diameter) at the operating temperature (T {approx} -100 C) and over the operational elevation angle range. We briefly describe the hierarchical design approach for the LSST Camera focal plane and the baseline design for assembling the flat focal plane at room temperature. Preliminary results of gravity load and thermal distortion calculations are provided, and early metrological verification of candidate materials under cold thermal conditions are presented. A detailed, generalized method for stitching together sparse metrology data originating from differential, non-contact metrological data acquisition spanning multiple (non-continuous) sensor surfaces making up the focal plane, is described and demonstrated. Finally, we describe some in situ alignment verification alternatives, some of which may be integrated into the camera's focal plane.
Date:
January 10, 2007
Creator:
A Rasmussen, Andrew P.; Hale, Layton; Kim, Peter; Lee, Eric; Perl, Martin; Schindler, Rafe et al.
Object Type:
Article
System:
The UNT Digital Library
Framework for Interactive Parallel Dataset Analysis on the Grid
We present a framework for use at a typical Grid site to facilitate custom interactive parallel dataset analysis targeting terabyte-scale datasets of the type typically produced by large multi-institutional science experiments. We summarize the needs for interactive analysis and show a prototype solution that satisfies those needs. The solution consists of desktop client tool and a set of Web Services that allow scientists to sign onto a Grid site, compose analysis script code to carry out physics analysis on datasets, distribute the code and datasets to worker nodes, collect the results back to the client, and to construct professional-quality visualizations of the results.
Date:
January 10, 2007
Creator:
Alexander, David A.; Ananthan, Balamurali; Johnson, Tony & Serbo, Victor
Object Type:
Article
System:
The UNT Digital Library
[Funeral Program for Elsie Lorraine Lewis, January 10, 2007]
Funeral program for Elsie Lorraine Lewis, born March 24, 1932 and died January 5, 2007. The funeral was held Wednesday, January 10, 2007 at New Covenant Missionary Baptist Church, officiated by Dr. Paul D. Stevens, Pastor. Funeral arrangements were made through Lewis Funeral Home.
Date:
January 10, 2007
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History