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789 Matching Results
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Slow Nonradiative Decay for Rare Earths in KPb2Br5 and RbPb2Br5
We report on spectroscopic investigations of Nd{sup 3+}- and Tb{sup 3+}- doped low phonon energy, moisture-resistant host crystals, KPb{sub 2}Br{sub 5} and RbPb{sub 2}Br{sub 5}, and their potential to serve as new solid state laser materials at new wavelengths, especially in the long wavelength infrared region. This includes emission spectra, emission lifetime measurements, Raman scattering spectra as well as calculations of the multiphonon decay rate, radiative lifetimes and quantum efficiencies for relevant (laser) transitions in these crystals.
Date:
February 27, 2004
Creator:
Rademaker, K.; Petermann, K.; Huber, G.; Krupke, W.; Page, R.; Payne, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Food and Drug Administration: Selected Funding and Policy Issues
This report discusses funding and policy issues regarding the Food and Drug Administration (FDA), which is responsible for ensuring the safety of foods, drugs, medical devices, cosmetics, and other products.
Date:
February 27, 2001
Creator:
Vogt, Donna U.
Object Type:
Report
System:
The UNT Digital Library
Oil and Gas Tax Subsidies: Current Status and Analysis
None
Date:
February 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Surface Figure Metrology for CELT Primary Mirror Segments
The University of California and California Institute of Technology are currently studying the feasibility of building a 30-m segmented ground based optical telescope called the California Extremely Large Telescope (CELT). The early ideas for this telescope were first described by Nelson and Mast and more recently refined by Nelson. In parallel, concepts for the fabrication of the primary segments were proposed by Mast, Nelson and Sommargren where high risk technologies were identified. One of these was the surface figure metrology needed for fabricating the aspheric mirror segments. This report addresses the advanced interferometry that will be needed to achieve 15nm rms accuracy for mirror segments with aspheric departures as large as 35mm peak-to-valley. For reasons of cost, size, measurement consistency and ease of operation we believe it is desirable to have a single interferometer that can be universally applied to each and every mirror segment. Such an instrument is described in this report.
Date:
February 27, 2001
Creator:
Sommargren, G; Phillion, D; Seppala, L & Lerner, S
Object Type:
Report
System:
The UNT Digital Library
Health Professions Programs in Title VII and Title VIII of the Public Health Service Act: Appropriations History (FY2002-FY2009)
The health professions programs in Titles VII and VIII of the Public Health Service Act provides grants, scholarships, and loans to support institutions and individuals in the education and training of health professional and the nursing workforce. This report contains information on Title VII Health Professional Education Appropriations, Title VIII Nursing Workforce Development Appropriations, and related information.
Date:
February 27, 2008
Creator:
Reyes-Akinbileje, Bernice & Wright, Mary Vennetta
Object Type:
Report
System:
The UNT Digital Library
Millennium Challenge Account
None
Date:
February 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
FY2007 Budget Documents: Internet Access and GPO Availability
This report provides brief descriptions of the budget volumes and related documents, together with internet addresses, Government Printing Office (GPO) stock numbers, and prices to obtain these publications. It also tells how to find locations of government depository libraries, which can provide both printed copies for reference use and internet access to the text.
Date:
February 27, 2006
Creator:
Teefy, Jennifer
Object Type:
Report
System:
The UNT Digital Library
Congressional Gold Medals, 1776-2003
This report responds to congressional inquiries concerning this process, and includes a historical examination and chronological list of these awards.
Date:
February 27, 2004
Creator:
Stathis, Stephen W.
Object Type:
Report
System:
The UNT Digital Library
Kosovo and U.S. Policy: Background and Current Issues
None
Date:
February 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Using Femtosecond Laser Subcellular Surgery as a Tool to Study Cell Biology
Research on cellular function and regulation would be greatly advanced by new instrumentation using methods to alter cellular processes with spatial discrimination on the nanometer-scale. We present a novel technique for targeting submicrometer sized organelles or other biologically important regions in living cells using femtosecond laser pulses. By tightly focusing these pulses beneath the cell membrane, we can vaporize cellular material inside the cell through nonlinear optical processes. This technique enables non-invasive manipulation of the physical structure of a cell with sub-micrometer resolution. We propose to study the role mitochondria play in cell proliferation and apoptosis. Our technique provides a unique tool for the study of cell biology.
Date:
February 27, 2007
Creator:
Shen, N; Colvin, M E & Huser, T
Object Type:
Report
System:
The UNT Digital Library
[Four, Bright Idea Awards 2008]
Four Texas Daily Newspaper Associations' Bright Ideas Award for 2008 labeled "Outstanding In-Paper Newspaper Promotion Campaigns." The awards will be presented to four newspapers, The Facts, the Austin American Statesman, Sequin Gazette Enterprise, and the Waco Tribune-Herald.
Date:
February 27, 2009
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
[Invoice and check statement]
An invoice and check statement from FedEx Kinko's to Mike McCue of $9.74 made on February 28, 2009.
Date:
February 27, 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Houston Area Stonewall Democrats Invoice]
An invoice from Texas Stonewall Democratic Caucus to Houston Area Stonewall Democrats of $15.00 on February 27, 2009.
Date:
February 27, 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Students reading a textbook]
Image of two students seated at a wooden table in a room, reading a textbook that is open in front of them. The one in pink is holding a highlighter and the one in brown is pointing to the text in the book. There is a large window behind them that is letting in light.
Date:
February 27, 2006
Creator:
University of North Texas. University Relations, Communications and Marketing.
Object Type:
Photograph
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 127, No. 38, Ed. 1 Thursday, February 27, 2003
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
February 27, 2003
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 41, Ed. 1 Wednesday, February 27, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 27, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 47, Ed. 1 Friday, February 27, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
February 27, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 31, No. 323, Ed. 1 Wednesday, February 27, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 27, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Development of a High Resolution X-Ray Imaging Crystal Spectrometer for Measurement of Ion-Temperature and Rotation-Velocity Profiles in Fusion Energy Research Plasmas
A new imaging high resolution x-ray crystal spectrometer (XCS) has been developed to measure continuous profiles of ion temperature and rotation velocity in fusion plasmas. Following proof-of-principle tests on the Alcator C-Mod tokamak and the NSTX spherical tokamak, and successful testing of a new silicon, pixilated detector with 1MHz count rate capability per pixel, an imaging XCS is being designed to measure full profiles of Ti and vφ on C-Mod. The imaging XCS design has also been adopted for ITER. Ion-temperature uncertainty and minimum measurable rotation velocity are calculated for the C-Mod spectrometer. The affects of x-ray and nuclear-radiation background on the measurement uncertainties are calculated to predict performance on ITER.
Date:
February 27, 2008
Creator:
Hill, K. W.; Broennimann, Ch; Eikenberry, E. F.; Ince-Cushman, A.; Lee, S. G.; Rice, J. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Environment, Safety, and Health Self-Assessment Report, Fiscal Year 2008
Lawrence Berkeley National Laboratory's Environment, Safety, and Health (ES&H) Self-Assessment Program ensures that Integrated Safety Management (ISM) is implemented institutionally and by all divisions. The Self-Assessment Program, managed by the Office of Contract Assurance (OCA), provides for an internal evaluation of all ES&H programs and systems at LBNL. The functions of the program are to ensure that work is conducted safely, and with minimal negative impact to workers, the public, and the environment. The Self-Assessment Program is also the mechanism used to institute continuous improvements to the Laboratory's ES&H programs. The program is described in LBNL/PUB 5344, Environment, Safety, and Health Self-Assessment Program and is composed of four distinct assessments: the Division Self-Assessment, the Management of Environment, Safety, and Health (MESH) review, ES&H Technical Assurance, and the Appendix B Self-Assessment. The Division Self-Assessment uses the five core functions and seven guiding principles of ISM as the basis of evaluation. Metrics are created to measure performance in fulfilling ISM core functions and guiding principles, as well as promoting compliance with applicable regulations. The five core functions of ISM are as follows: (1) Define the Scope of Work; (2) Identify and Analyze Hazards; (3) Control the Hazards; (4) Perform the Work; and …
Date:
February 27, 2009
Creator:
Chernowski, John
Object Type:
Report
System:
The UNT Digital Library
Aza Cope Rearrangement of Propargyl Enammonium Cations Catalyzed By a Self-Assembled `Nanozyme
The tetrahedral [Ga{sub 4}L{sub 6}]{sup 12-} assembly (L = N,N-bis(2,3-dihydroxybenzoyl)-1,5-diaminonaphthalene) encapsulates a variety of cations, including propargyl enammonium cations capable of undergoing the aza Cope rearrangement. For propargyl enammonium substrates that are encapsulated in the [Ga{sub 4}L{sub 6}]{sup 12-} assembly, rate accelerations of up to 184 are observed when compared to the background reaction. After rearrangement, the product iminium ion is released into solution and hydrolyzed allowing for catalytic turnover. The activation parameters for the catalyzed and uncatalyzed reaction were determined, revealing that a lowered entropy of activation is responsible for the observed rate enhancements. The catalyzed reaction exhibits saturation kinetics; the rate data obey the Michaelis-Menten model of enzyme kinetics, and competitive inhibition using a non-reactive guest has been demonstrated.
Date:
February 27, 2008
Creator:
Hastings, Courntey J.; Fiedler, Dorothea; Bergman, Robert G. & Raymond, Kenneth N.
Object Type:
Article
System:
The UNT Digital Library
First Quarter Hanford Seismic Report for Fiscal Year 2001
Hanford Seismic Monitoring provides an uninterrupted collection of high-quality raw and processed seismic data from the Hanford Seismic Network (HSN) for the U.S. Department of Energy and its contractors. Hanford Seismic Monitoring also locates and identifies sources of seismic activity and monitors changes in the historical pattern of seismic activity at the Hanford Site. The data are compiled, archived, and published for use by the Hanford Site for waste management, Natural Phenomena Hazards assessments, and engineering design and construction. In addition, the seismic monitoring organization works with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant earthquake on the Hanford Site. The HSN and the Eastern Washington Regional Network (EWRN) consist of 41 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic Monitoring staff. For the HSN, there were 477 triggers during the first quarter of fiscal year (FY) 2001 on the data acquisition system. Of these triggers, 176 were earthquakes. Forty-five earthquakes were located in the HSN area; 1 earthquake occurred in the Columbia River Basalt Group, 43 were earthquakes in the pre-basalt sediments, and 1 was earthquakes in the crystalline basement. Geographically, 44 earthquakes occurred in swarm areas, …
Date:
February 27, 2001
Creator:
Hartshorn, Donald C.; Reidel, Stephen P.; Rohay, Alan C. & Valenta, Michelle M.
Object Type:
Report
System:
The UNT Digital Library
FY08 LDRD Final Report LOCAL: Locality-Optimizing Caching Algorithms and Layouts
This project investigated layout and compression techniques for large, unstructured simulation data to reduce bandwidth requirements and latency in simulation I/O and subsequent post-processing, e.g. data analysis and visualization. The main goal was to eliminate the data-transfer bottleneck - for example, from disk to memory and from central processing unit to graphics processing unit - through coherent data access and by trading underutilized compute power for effective bandwidth and storage. This was accomplished by (1) designing algorithms that both enforce and exploit compactness and locality in unstructured data, and (2) adapting offline computations to a novel stream processing framework that supports pipelining and low-latency sequential access to compressed data. This report summarizes the techniques developed and results achieved, and includes references to publications that elaborate on the technical details of these methods.
Date:
February 27, 2009
Creator:
Lindstrom, P
Object Type:
Report
System:
The UNT Digital Library
Photoelectron Spectroscopy under Ambient Pressure and Temperature Conditions
We describe the development and applications of novel instrumentation for photoemission spectroscopy of solid or liquid surfaces in the presence of gases under ambient conditions or pressure and temperature. The new instrument overcomes the strong scattering of electrons in gases by the use of an aperture close to the surface followed by a differentially-pumped electrostatic lens system. In addition to the scattering problem, experiments in the presence of condensed water or other liquids require the development of special sample holders to provide localized cooling. We discuss the first two generations of Ambient Pressure PhotoEmission Spectroscopy (APPES) instruments developed at synchrotron light sources (ALS in Berkeley and BESSY in Berlin), with special focus on the Berkeley instruments. Applications to environmental science and catalytic chemical research are illustrated in two examples.
Date:
February 27, 2009
Creator:
Ogletree, D. Frank; Bluhm, Hendrik; Hebenstreit, Eleonore B. & Salmeron, Miquel
Object Type:
Article
System:
The UNT Digital Library