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1,059 Matching Results

Start Over Year 2005 Day 26th Language English

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(open access)

4th-International Symposium on Ultrafast Surface Science - Final Report

The 4-th International Symposium on Ultrafast Surface Dynamics (UDS4) was held at the Telluride Summer Research Center on June 22-27, 2003. The International Organizing Committee consisting of Hrvoje Petek (USA), Xiaoyang Zhu (USA), Pedro Echenique (Spain) and Maki Kawai (Japan) brought together a total of 51 participants 16 of whom were from Europe, 10 from Japan, and 25 from the USA. The focus of the conference was on ultrafast electron or light induced processes at well-defined surfaces. Ultrafast surface dynamics concerns the transfer of charge and energy at solid surfaces on the femtosecond time scale. These processes govern rates of fundamental steps in surface reactions, interfacial electron transfer in molecular electronics, and relaxation in spin transport. Recent developments in femtosecond laser technology make it possible to measure by a variety of nonlinear optical techniques directly in the time domain the microscopic rates underlying these interfacial processes. Parallel progress in scanning probe microscopy makes it possible at a single molecular level to perform the vibrational and electronic spectroscopy measurements, to induce reactions with tunneling electrons, and to observe their outcome. There is no doubt that successful development in the field of ultrafast surface dynamics will contribute to many important disciplines.

Date: January 26, 2005

Creator: Petek, Hrvoje

Object Type: Report

System: The UNT Digital Library

(open access)

An Agent that can Prohibit Microbial Development and Infection

We have developed a process that makes use of double-stranded DNA:RNA hybrids to inhibit specific, targeted genetic activity completely within a cell. This process can be used in both human and bacterial cells. The agent that produces this effect can be inserted into a cell and remain quiescent for a considerable period of time without affecting cellular processes, until the gene against which it is targeted is induced. At this time the agent becomes effective, silencing the genetic response without affecting the host cell in any other way. When given as an anti-infective, this process may have significant use as an anti-bacterial, anti-viral agent. Our objective with this proposal is to develop the siHybrid concept sufficiently that it can be used as both an antibiotic and an antiviral agent.

Date: January 26, 2005

Creator: Christian, A

Object Type: Report

System: The UNT Digital Library

(open access)

Altus Times (Altus, Okla.), Vol. 106, No. 250, Ed. 1 Wednesday, January 26, 2005

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Andrews, Mike

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, January 26, 2005

Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Schwind, Jim & Looby, Edward

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Archer Advocate (Holliday, Tex.), Vol. 2, No. 43, Ed. 1 Wednesday, January 26, 2005

Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Thomas, John

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Baytown Sun (Baytown, Tex.), Vol. 84, No. 53, Ed. 1 Wednesday, January 26, 2005

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Cash, Wanda Garner

Object Type: Newspaper

System: The Portal to Texas History

(open access)

THE BNL SUPER NEUTRINO BEAM PROJECT.

BNL plans to create a very long base line super neutrino beam facility by upgrading the AGS from the current 0.14 MW to 1.0 MW and beyond. The proposed facility consists of three major components. First is a 1.5 GeV superconducting linac to replace the booster as injector for the AGS, second is the performance upgrade of the AGS itself for higher intensity and repetition rate, and finally is the target and horn system for the neutrino production. The major contribution for the higher power is from the increase of the repetition rate of the AGS from 0.3 Hz to 2.5 Hz, with moderate increase from the intensity. The accelerator design considerations to achieve high intensity and low losses for the new linac and the AGS will be presented. The target and horn design for high power operation and easy maintenance will also be covered.

Date: January 26, 2005

Creator: Raparia, D.

Object Type: Article

System: The UNT Digital Library

(open access)

Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 49, Ed. 1 Wednesday, January 26, 2005

Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.

Date: January 26, 2005

Creator: Whitehead, Marie

Object Type: Newspaper

System: The Portal to Texas History

(open access)

CO2 Capture by Absorption with Potassium Carbonate

The objective of this work is to improve the process for CO{sub 2} capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous K{sub 2}CO{sub 3} promoted by piperazine. In Campaign 3 of the pilot plant, the overall mass transfer coefficient for the stripper with 7 m MEA decreased from 0.06 to 0.01 mol/(m{sup 3}.s.kPa) as the rich loading increased from 0.45 to 0.6 mol CO{sub 2}/mol MEA. Anion chromatography has demonstrated that nitrate and nitrite are major degradation products of MEA and PZ with pure oxygen. In measurements with the high temperature FTIR in 7 m MEA the MEA vapor pressure varied from 2 to 20 Pa at 35 to 70 C. In 2.5 m PZ the PZ vapor pressure varied from 0.2 to 1 Pa from 37 to 70 C.

Date: January 26, 2005

Creator: Rochelle, Gary T.; Hilliard, Marcus; Chen, Eric; Oyenekan, Babatunde; Dugas, Ross; McLees, John et al.

Object Type: Report

System: The UNT Digital Library

(open access)

The Colony Courier-Leader (The Colony, Tex.), Vol. 23, No. 51, Ed. 1 Wednesday, January 26, 2005

Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Sorter, Dave

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Complete Solution of Elastica for a Clamped-Hinged Beam, and Its Applications to a Carbon Nanotube

This paper treats an exact elastica solution for a clamped-hinged beam, and its application to a carbon nanotube. Although the elastica has a long history, and the exact post-buckling solution for the Euler buckling problem has been known for at least 150 years, it seems that the elastica solution obtained in this paper constitutes an addition to the existing family of elastica solutions. As an application of the results, a post-buckling analysis of a single wall carbon nanotube is studied. Also, a potential use of the posting-buckling analysis of the carbon nanotube for the determination of its Young's modulus has been indicated.

Date: January 26, 2005

Creator: Mikata, Y

Object Type: Article

System: The UNT Digital Library

(open access)

The Cuero Record (Cuero, Tex.), Vol. 111, No. 4, Ed. 1 Wednesday, January 26, 2005

Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Rea, Glenn

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Detecting and Attributing External Influences on the Climate System: A Review of Recent Advances

We review recent research that assesses evidence for the detection of anthropogenic and natural external influences on the climate. Externally driven climate change has been detected by a number of investigators in independent data covering many parts of the climate system, including surface temperature on global and large regional scales, ocean-heat content, atmospheric circulation, and variables of the free atmosphere, such as atmospheric temperature and tropopause height. The influence of external forcing is also clearly discernible in reconstructions of hemispheric scale temperature of the last millennium. These observed climate changes are very unlikely to be due only to natural internal climate variability, and they are consistent with the responses to anthropogenic and natural external forcing of the climate system that are simulated with climate models. The evidence indicates that natural drivers such as solar variability and volcanic activity are at most partially responsible for the large-scale temperature changes observed over the past century, and that a large fraction of the warming over the last 50 years can be attributed to greenhouse gas increases. Thus the recent research supports and strengthens the IPCC Third Assessment Report conclusion that ''most of the global warming over the past 50 years is likely due …

Date: January 26, 2005

Creator: Barnett, T.; Zwiers, F.; Hegerl, G.; Allen, M.; Crowley, T.; Gillett, N. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Effect of Stress Mitigation on Precipitation Kinetics of Alloy 22 Welds

Understanding the phase stability of Alloy 22 (N06022) is important since the precipitation of tetrahedrally close-packed (TCP) phases over time has been known to adversely affect corrosion and mechanical properties. Prior observations have shown that these phases precipitate during the welding process. After welding, residual stresses due to the solidification and cooling from temperature remain. When the weld cannot be stress-relieved by solution annealing, the application of commercially available stress-mitigation processes such as low plasticity burnishing (LPB) and laser shock peening (LSP) may be used to produce near-surface compressive stresses. This study involved examination of cross-sectional samples of aged 1.25 inch thick welds of Alloy 22 plates using electron backscatter diffraction (EBSD) for TCP identification and micrograph analysis for TCP quantification. Precipitation in both the as-welded and LSP weld was observed primarily in inter-dendritic regions whilst precipitation in the LPB weld was in both inter- and intra-dendritic regions.

Date: January 26, 2005

Creator: El-Dasher, B S & Torres, S G

Object Type: Article

System: The UNT Digital Library

(open access)

Experimental Measurements of Delayed Fission Product Gamma-Ray Transmission Through Low Enriched UO2 Fuel Pin Lattices in Air

Experimental measurements of delayed fission-product gamma-ray transmission through low-enriched UO{sub 2} fuel pin lattices in an air medium were conducted at the Rensselaer Polytechnic Institute Reactor Critical Facility (RCF). The RCF core consists of excess Special Power Excursion Reactor Test (SPERT) fuel pins, enriched to 4.81 weight percent {sup 235}U, clad in stainless steel. An experimental apparatus was constructed to hold various arrangements of fuel pin lattices. The arrangements consisted of a single activated source pin taken from the reactor core surrounded by inactive fuel pins in an air medium. A sodium-iodide detector and gamma-ray spectroscopy system was used to generate a pulse-height spectrum of the gamma-ray radiation for detector positions outside the lattice. The change in radiation intensity as the detector is rotated about the vertical axis of the lattice, the ''channeling effect,'' was measured. Experimental measurements of the channeling effect were performed for six arrangements; 3 x 3, 5 x 5, and 7 x 7 lattices, with both the comer position and center position containing the activated pin. The results of the measurements demonstrate that the gamma-ray radiation intensity can vary widely, as a function of angle, relative to the vertical axis of the lattice.

Date: January 26, 2005

Creator: Trumbull, T & Harris, D

Object Type: Article

System: The UNT Digital Library

(open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, January 26, 2005

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.

Date: January 26, 2005

Creator: Bush, Kent

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

Federal Procurement: International Agreements Result in Waivers of Some U.S. Domestic Source Restrictions

A letter report issued by the Government Accountability Office with an abstract that begins "Over the years, Congress has enacted a variety of laws designed to encourage federal agencies to purchase U.S. supplies and services. These laws are commonly referred to as domestic preference laws or domestic source restrictions. Perhaps the best known of these laws is the Buy American Act, a 1933 law that established a statutory preference for U.S. supplies and construction materials. At the same time, Congress has approved a number of international agreements that open certain government procurements to goods and services from countries that are parties to those agreements. In addition, the Department of Defense (DOD) has entered into reciprocal procurement memoranda of understanding (MOUs) with some of its foreign counterparts, under which DOD may procure goods and services from those countries. Congress asked us to determine the effect of international agreements on the applicability of U.S. domestic source restrictions. In response, this report (1) identifies the current international trade agreements to which the U.S. is a party that contain government procurement provisions, as well as the reciprocal defense procurement MOUs, and (2) describes how these trade agreements and MOUs affect the applicability of selected …

Date: January 26, 2005

Creator: United States. Government Accountability Office.

Object Type: Report

System: The UNT Digital Library

(open access)

Fruits, Vegetables, and Other Specialty Crops: A Primer on Government Programs

U.S. farmers grow more than 250 types of fruit, vegetable, tree nut, flower, ornamental nursery, and turfgrass crops in addition to the major bulk commodity crops. Although specialty crops are ineligible for the federal commodity price and income support programs, they are eligible for other types of U.S. Department of Agriculture (USDA) support, such as crop insurance, disaster assistance, and, under certain conditions, ad hoc market loss assistance payments. This report describes the federal programs of importance to the specialty crop sector, and provides the most recent funding information available for them.

Date: January 26, 2005

Creator: Rawson, Jean M.

Object Type: Report

System: The UNT Digital Library

(open access)

Gasoline Prices: New Legislation and Proposals

This report discusses policy options for Congress regarding gas prices. The high price of gasoline was an important consideration during the debate on major energy legislation, which ended August 8 as the President signed the Energy Policy Act of 2005, H.R. 6 (P.L. 109-58). However, prices continued to surge, spiking at the end of August when Hurricane Katrina shut down refining operations in the Gulf of Mexico. The continuing crisis renewed attention to some issues that were dropped or compromised in the debate over P.L. 109-58. A large number of factors combined to put pressure on gasoline prices, including increased world demand for crude oil and U.S. refinery capacity inadequate to supply gasoline to a recovering national economy. The war and continued violence in Iraq added uncertainty and a threat of supply disruption that added pressure particularly to the commodity futures markets.

Date: January 26, 2005

Creator: Behrens, Carl E. & Glover, Carol

Object Type: Report

System: The UNT Digital Library