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420 Matching Results
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U.S. Department of Energy (DOE) Technical Assistance to Beichuan Reconstruction: Creating and Designing Low- to Zero-carbon Communities in New Beichuan, Sichuan Province
Beichuan county, located in north of Sichuan Province, was the most severely damaged township in last May's Sichuan earthquake. Reconstruction of a new Beichuan is a high-profiled project by the governments. In addition to constructing structurally-sound, quake-safe buildings in the new development, rebuilding Beichuan presents an opportunity for constructing new low- to zero-carbon communities in the region. In fact, building up greener communities in the reconstruction has become a top priority for the county, which, at an estimated 7 square km, is expected to have 50,000 residents in 2015 and 70,000 in 2020. The recent focus of construction projects is on the east side of the river, while land on its west bank will be reserved for development in the mid- to long-term. In the near term, a number of new public buildings are scheduled to be constructed starting in November 2009. As indicated by the deputy county chief, Mr. He Wang, the construction timeframe is unusually tight. Many buildings, although in various stages of planning and design, will be constructed starting in November 2009. Timely expert advice on design improvement and planning considerations will benefit the integration of energy efficiency and environmental benign elements in Beichuan's reconstruction, and will …
Date:
October 29, 2009
Creator:
Xu, Tengfang; Wang, Chuang; Hong, Tianzhen & Levine, Mark
Object Type:
Report
System:
The UNT Digital Library
Wind Power Development in the United States: Current Progress, Future Trends
The U.S. wind power industry is in an era of substantial growth, with the U.S. and China likely to vie for largest-market status for years to come. With the market evolving at such a rapid pace, keeping up with current trends in the marketplace has become increasingly difficult. At the same time, limits to future growth are uncertain. This paper summarizes major trends in the U.S. wind market, and explores the technical and economic feasibility of achieving much greater levels of wind penetration. China would be well served to conduct similar analyses of the feasibility, benefits, challenges, and policy needs associated with much higher levels of wind power generation than currently expressed in national targets.
Date:
October 29, 2008
Creator:
Wiser, Ryan H
Object Type:
Article
System:
The UNT Digital Library
Performance-Driven Robust Identification and Control of Uncertain Dynamical Systems
The grant DEFG02-97ER13939 from the Department of Energy has supported our research program on robust identification and control of uncertain dynamical systems, initially for the three-year period June 15, 1997-June 14, 2000, which was then extended on a no-cost basis for another year until June 14, 2001. This final report provides an overview of our research conducted during this period, along with a complete list of publications supported by the Grant. Within the scope of this project, we have studied fundamental issues that arise in modeling, identification, filtering, control, stabilization, control-based model reduction, decomposition and aggregation, and optimization of uncertain systems. The mathematical framework we have worked in has allowed the system dynamics to be only partially known (with the uncertainties being of both parametric or structural nature), and further the dynamics to be perturbed by unknown dynamic disturbances. Our research over these four years has generated a substantial body of new knowledge, and has led to new major developments in theory, applications, and computational algorithms. These have all been documented in various journal articles and book chapters, and have been presented at leading conferences, as to be described. A brief description of the results we have obtained within the …
Date:
October 29, 2001
Creator:
Basar, Tamer
Object Type:
Report
System:
The UNT Digital Library
Development of Durable, Low-Cost, High-Performance Pt Alloy Electrocatalysts for H2/Air Fuel Cell Application
None
Date:
October 29, 2006
Creator:
Sun, Yipeng
Object Type:
Presentation
System:
The UNT Digital Library
Readout System for Arrays of Frisch-Ring CdZnTe Detectors.
Frisch-ring CdZnTe detectors have demonstrated good energy resolution for identifying isotopes, <1% FWHM at 662 keV, and good efficiency for detecting gamma rays. We will fabricate and test at Brookhaven National Laboratory an integrated module of a 64-element array of 6 x 6 x 12 mm{sup 3} Frisch-ring detectors, coupled with a readout electronics system. It supports 64 readout channels, and includes front-end electronics, signal processing circuit, USB interface and high-voltage power supply. The data-acquisition software is used to process the data stream, which includes amplitude and timing information for each detected event. This paper describes the design and assembly of the detector modules, readout electronics, and a conceptual prototype system. Some test results are also reported.
Date:
October 29, 2006
Creator:
Cui, Y.; Bolotnikov, A. E.; Camarda, G. S.; De Geronimo, G.; O'Connor, P.; James, R. B. et al.
Object Type:
Article
System:
The UNT Digital Library
Observations of Ferrite/Austenite Transformations in the Heat Affected Zone of 2205 Duplex Stainless Steel Spot Welds Using Time Resolved X-Ray Diffraction
Time Resolved X-Ray Diffraction (TRXRD) measurements are made in the Heat Affected Zone (HAZ) of 2205 Duplex Stainless Steel (DSS) spot welds. Both the {gamma} {yields} {delta} and {delta} {yields} {gamma} transformations are monitored as a function of time during the rapid spot weld heating and cooling cycles. These observations are then correlated with calculated thermal cycles. Where the peak temperatures are highest ({approx}1342 C), the {gamma} {yields} {delta} transformation proceeds to completion, leaving a ferritic microstructure at the end of heating. With lower peak temperatures, the {gamma} {yields} {delta} transformation proceeds to only partial completion, resulting in a microstructure containing both transformed and untransformed austenite. Further analyses of the individual diffraction patterns show shifts in the peak positions and peak widths as a function of both time and temperature. In addition, these changes in the peak characteristics are correlated with measured changes in the ferrite volume fraction. Such changes in the peak positions and widths during the {gamma} {yields} {delta} transformation provide an indication of changes occurring in each phase. These changes in peak properties can be correlated with the diffusion of nitrogen and other substitutional alloying elements, which are recognized as the primary mechanisms for this transformation. Upon …
Date:
October 29, 2003
Creator:
Palmer, T.; Elmer, J. & Babu, S.
Object Type:
Article
System:
The UNT Digital Library
Optical Cluster-Finding with an Adaptive Matched-Filter Technique: Algorithm and Comparison with Simulations
We present a modified adaptive matched filter algorithm designed to identify clusters of galaxies in wide-field imaging surveys such as the Sloan Digital Sky Survey. The cluster-finding technique is fully adaptive to imaging surveys with spectroscopic coverage, multicolor photometric redshifts, no redshift information at all, and any combination of these within one survey. It works with high efficiency in multi-band imaging surveys where photometric redshifts can be estimated with well-understood error distributions. Tests of the algorithm on realistic mock SDSS catalogs suggest that the detected sample is {approx} 85% complete and over 90% pure for clusters with masses above 1.0 x 10{sup 14}h{sup -1} M and redshifts up to z = 0.45. The errors of estimated cluster redshifts from maximum likelihood method are shown to be small (typically less that 0.01) over the whole redshift range with photometric redshift errors typical of those found in the Sloan survey. Inside the spherical radius corresponding to a galaxy overdensity of {Delta} = 200, we find the derived cluster richness {Lambda}{sub 200} a roughly linear indicator of its virial mass M{sub 200}, which well recovers the relation between total luminosity and cluster mass of the input simulation.
Date:
October 29, 2007
Creator:
Dong, Feng; Pierpaoli, Elena; Gunn, James E. & Wechsler, Risa H.
Object Type:
Article
System:
The UNT Digital Library
SARC: Development and Support of a Sarcoma Research Consortium Infrastructure
SARC is a non-for-profit organization whose mission and vision is to advocate for the collaboration on the design of clinical trials on sarcoma, to further the knowledge regarding the diagnosis and treatment of sarcoma and provide accurate and up to date information to physicians, patients and families. The objectives are to assist in the development of the infrastructure for the continued growth and spectrum of clinical research, to facilitate biannual meeting of investigators, and to develop a preclinical research base that would design and conduct research that would improve the process of drug treatments selected for clinical research trials.
Date:
October 29, 2007
Creator:
Arkison, Jim
Object Type:
Report
System:
The UNT Digital Library
Performance-Limiting Defects in CdZnTe Detectors.
We studied the effects of small, <20 {micro}m, Te inclusions on the energy resolution of CdZnTe gamma-ray detectors using a highly collimated X-ray beam and gamma-rays, and modeled them via a simplified geometrical approach. Previous reports demonstrated that Te inclusions of about a few microns in diameter degraded the charge-transport properties and uniformity of CdZnTe detectors. The goal of this work was to understand the extent to which randomly distributed Te-rich inclusions affect the energy resolution of CZT detectors, and to define new steps to overcome their deleterious effects. We used a phenomenological model, which depends on several adjustable parameters, to reproduce the experimentally measured effects of inclusions on energy resolution. We also were able to hound the materials-related problem and predict the enhancement in performance expected by reducing the size and number of Te inclusions within the crystals.
Date:
October 29, 2006
Creator:
Bolotnikov, A. E.; Camarda, G. S.; Cui, Y.; Kohman, K. T.; Li, L.; Salomon, M. B. et al.
Object Type:
Article
System:
The UNT Digital Library
Suzaku Observations of AGN and Synergy with GLAST
In next five years, dramatic progress is anticipated for the AGN studies, as we have two important missions to observe celestial sources in the high energy regime: GLAST and Suzaku. Suzaku is the 5th Japanese X-ray astronomy satellite which was successfully launched in July 2005. It carries four X-ray sensitive imaging CCD cameras (0.2-12 keV) located in the focal planes of X-ray telescope, and a non-imaging, collimated hard X-ray detector, which extends the bandpass of the observatory to include the 10-600 keV range. Simultaneous monitoring observations by the two instruments (GLAST and Suzaku) will be particularly valuable for variable radio-loud AGN, allowing the cross-correlations of time series as well as detailed modeling of the spectral evolution between the X-ray and gamma-ray energy bands. In this paper, we show early highlights from Suzaku observations of radio-loud AGNs, and discuss what we can do with GLAST in forthcoming years.
Date:
October 29, 2007
Creator:
Kataoka, Jun; Takahashi, Tad & Madejski, Greg
Object Type:
Article
System:
The UNT Digital Library
Supermassive Black Hole Growth and Merger Rates from Cosmological N-body Simulations
Understanding how seed black holes grow into intermediate and supermassive black holes (IMBHs and SMBHs, respectively) has important implications for the duty-cycle of active galactic nuclei (AGN), galaxy evolution, and gravitational wave astronomy. Most studies of the cosmological growth and merger history of black holes have used semianalytic models and have concentrated on SMBH growth in luminous galaxies. Using high resolution cosmological N-body simulations, we track the assembly of black holes over a large range of final masses - from seed black holes to SMBHs - over widely varying dynamical histories. We used the dynamics of dark matter halos to track the evolution of seed black holes in three different gas accretion scenarios. We have found that growth of a Sagittarius A* - size SMBH reaches its maximum mass M{sub SMBH}={approx}10{sup 6}M{sub {circle_dot}} at z{approx}6 through early gaseous accretion episodes, after which it stays at near constant mass. At the same redshift, the duty-cycle of the host AGN ends, hence redshift z=6 marks the transition from an AGN to a starburst galaxy which eventually becomes the Milky Way. By tracking black hole growth as a function of time and mass, we estimate that the IMBH merger rate reaches a maximum …
Date:
October 29, 2007
Creator:
Micic, Miroslav; Holley-Bockelmann, Kelly; Sigurdsson, Steinn & Abel, Tom
Object Type:
Report
System:
The UNT Digital Library
RP-5 Renewable Energy Efficiency Project
None
Date:
October 29, 2003
Creator:
Clifton, Neil; Whitman, Eliza Jane & Zughbi, Jamal A.
Object Type:
Report
System:
The UNT Digital Library
Design of a Large-Area Fast Neutron Directional Detector.
A large-area fast-neutron double-scatter directional detector and spectrometer is being constructed using l-meter-long plastic scintillator paddles with photomultiplier tubes at both ends. The scintillators detect fast neutrons by proton recoil and also gamma rays by Compton scattering. The paddles are arranged in two parallel planes so that neutrons can be distinguished from muons and gamma rays by time of flight between the planes. The signal pulses are digitized with a time resolution of one gigasample per second. The location of an event along each paddle can be determined from the relative amplitudes or timing of the signals at the ends. The angle of deflection of a neutron in the first plane can be estimated from the energy deposited by the recoil proton, combined with the scattered neutron time-of-flight energy. Each scattering angle can be back-projected as a cone, and many intersecting cones define the incident neutron direction from a distant point source. Moreover, the total energy of each neutron can be obtained, allowing some regions of a fission source spectrum to be distinguished from background generated by cosmic rays. Monte Carlo calculations will be compared with measurements.
Date:
October 29, 2006
Creator:
Vanier, P. E.
Object Type:
Article
System:
The UNT Digital Library
Design, Fabrication, and Test of a 5-kWh/100-kW Flywheel Energy Storage Utilizing a High-Temperature Superconducting Bearing
None
Date:
October 29, 2007
Creator:
Dr. Michael Strasik, Philip E Johnson; Day, A. C.; Mittleider, J.; Higgins, M. D.; Edwards, J.; Schindler, J. R. et al.
Object Type:
Article
System:
The UNT Digital Library
Scale-Up, Production, and Procurement of PEP Simulants
Pacific Northwest National Laboratory has been tasked by Bechtel National Inc. on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility. The Pretreatment Engineering Platform (PEP) was designed, constructed, and operated as part of a plan to respond to issue M12, “Undemonstrated Leaching Processes.” The PEP is a 1/4.5-scale test platform designed to simulate the WTP pretreatment caustic leaching, oxidative leaching, ultrafiltration solids concentration, and slurry washing processes. The PEP replicates the WTP leaching processes using prototypic equipment and control strategies. This report provides the lessons learned regarding the manufacture and delivery of simulated feeds for PEP testing.
Date:
October 29, 2009
Creator:
Scheele, Randall D.; Brown, Garrett N. & Kurath, Dean E.
Object Type:
Report
System:
The UNT Digital Library
Seminole Sentinel (Seminole, Tex.), Vol. 98, No. 6, Ed. 1 Sunday, October 29, 2006
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 29, 2006
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 115, No. 21, Ed. 1 Tuesday, October 29, 2002
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 2002
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 94, No. 4, Ed. 1 Sunday, October 29, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 79, No. 8, Ed. 1 Friday, October 29, 2004
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
October 29, 2004
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 124, No. 87, Ed. 1 Sunday, October 29, 2006
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
October 29, 2006
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 108, No. 87, Ed. 1 Wednesday, October 29, 2003
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 2003
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 118, No. 85, Ed. 1 Sunday, October 29, 2000
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
October 29, 2000
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 44, Ed. 1 Wednesday, October 29, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Time-step Considerations in Particle Simulation Algorithms for Coulomb Collisions in Plasmas
The accuracy of first-order Euler and higher-order time-integration algorithms for grid-based Langevin equations collision models in a specific relaxation test problem is assessed. We show that statistical noise errors can overshadow time-step errors and argue that statistical noise errors can be conflated with time-step effects. Using a higher-order integration scheme may not achieve any benefit in accuracy for examples of practical interest. We also investigate the collisional relaxation of an initial electron-ion relative drift and the collisional relaxation to a resistive steady-state in which a quasi-steady current is driven by a constant applied electric field, as functions of the time step used to resolve the collision processes using binary and grid-based, test-particle Langevin equations models. We compare results from two grid-based Langevin equations collision algorithms to results from a binary collision algorithm for modeling electronion collisions. Some guidance is provided regarding how large a time step can be used compared to the inverse of the characteristic collision frequency for specific relaxation processes.
Date:
October 29, 2009
Creator:
Cohen, B. I.; Dimits, A.; Friedman, A. & Caflisch, R.
Object Type:
Article
System:
The UNT Digital Library