17 Matching Results

Search Results

Results: 1 - 17
open access

Experimental evidence of a dynamic Jahn-Teller effect in C-60(+)

Description: Detailed analysis of the HOMO bandshape in the photoelectron spectrum of gaseous C60 reveals a dynamic Jahn-Teller effect in the ground state of C60+. The direct observation of three tunneling states asserts a D3d geometry for the isolated cation, originating from a strong vibronic coupling. These results show that the ionic motion of the ions plays an important role in the electron-phonon interaction.
Date: May 20, 2002
Creator: Canton, S.E.; Yencha, A.J.; Kukk, E.; Bozek, J.D.; Lopes, M.C.A.; Snell, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

[Press release: The Black Academy of Arts and Letters Celebrates Black Music Month with the U.S. and Dallas Premiere of "Wild Women Blues" June 4th-9th Starring Linda Hopkins]

Description: Press release from the Black Academy of Arts and Letters discussing a blues music performance produced by the Academy to be performed June 4-9, 2002, at the Naomi Bruton Theater.
Date: May 20, 2002
Creator: Black Academy of Arts and Letters
Item Type: Refine your search to only Text
Partner: UNT Libraries Special Collections
open access

Identification of Non-Pertechnetate Species in Hanford Tank Waste, Their Synthesis, Characterization, and Fundamental Chemistry

Description: Technetium, as pertechnetate (TcO4 -), is a mobile species in the environment. This characteristic, along with its long half-life, (99Tc, t1/2 = 213,000 a) makes technetium a major contributor to the long-term hazard associated with low level waste (LLW) disposal. Technetium partitioning from the nuclear waste at DOE sites will be required so that the LLW forms meet DOE performance assessment criteria. Technetium separations assume that technetium exists as TcO4 - in the waste. However, years o… more
Date: May 20, 2002
Creator: Schroeder, Norman C.; Olivares, Jose A. & Ashley, Kenneth R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Heavy ion physics at RHIC and in CMS and the participation of the US nuclear physicists in CMS

Description: The field of relativistic heavy ion physics entered a new era with the start of the physics program at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory on Long Island, New York. This dedicated facility allows extensive studies of the nuclear matter phase diagram at the highest temperatures so far available in the laboratory. The goal of the program is to conclusively establish the existence of the deconfined state of nuclear matter predicted by QCD, the Quark Gluon P… more
Date: May 20, 2002
Creator: Vogt, Ramona; Wyslouch, Bolek & Yepes, Pablo
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Earth Systems Questions in Experimental Climate Change Science: Pressing Questions and Necessary Facilities

Description: Sixty-four scientists from universities, national laboratories, and other research institutions worldwide met to evaluate the feasibility and potential of the Biosphere2 Laboratory (B2L) as an inclusive multi-user scientific facility (i.e., a facility open to researchers from all institutions, according to agreed principles of access) for earth system studies and engineering research, education, and training relevant to the mission of the United States Department of Energy (DOE).
Date: May 20, 2002
Creator: Osmond, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The distant type Ia supernova rate

Description: We present a measurement of the rate of distant Type Ia supernovae derived using 4 large subsets of data from the Supernova Cosmology Project. Within this fiducial sample,which surveyed about 12 square degrees, thirty-eight supernovae were detected at redshifts 0.25--0.85. In a spatially flat cosmological model consistent with the results obtained by the Supernova Cosmology Project, we derive a rest-frame Type Ia supernova rate at a mean red shift z {approx_equal} 0.55 of 1.53 {sub -0.25}{sub -… more
Date: May 20, 2002
Creator: Pain, R.; Fabbro, S.; Sullivan, M.; Ellis, R. S.; Aldering, G.; Astier, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Market leadership by example: Government sector energy efficiency in developing countries

Description: Government facilities and services are often the largest energy users and major purchasers of energy-using equipment within a country. In developing as well as industrial countries, government ''leadership by example'' can be a powerful force to shift the market toward energy efficiency, complementing other elements of a national energy efficiency strategy. Benefits from more efficient energy management in government facilities and operations include lower government energy bills, reduced green… more
Date: May 20, 2002
Creator: Van Wie McGrory, Laura; Harris, Jeffrey; Breceda, Miguel; Campbell, Stephanie; Sachu, Constantine; della Cava, Mirka et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Use of projectional phase space data to infer a 4D particle distribution

Description: We consider beams which are described by a 4D transverse distribution f(x,y,x{prime},y{prime}), where x{prime} {triple_bond} p{sub x}/p{sub z} and z is the axial coordinate. A two-slit scanner is commonly employed to measure, over a sequence of shots, a 2D projection of such a beam's phase space, e.g., f(x,x{prime}). Another scanner might yield f(y,y{prime}) or, using crossed slits, f(x,y). A small set of such 2D scans does not uniquely specify f(x,y,x{prime},y{prime}). We have developed ''tomo… more
Date: May 20, 2002
Creator: Friedman, A.; Grote, D. P.; Celata, C. M. & Staples, J. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A 1.8 Mev K+ injector for the high current beam transport experiment fusion

Description: For the High Current Beam Transport Experiment (HCX) at LBNL, an injector is required to deliver up to 1.8 MV of 0.6 A K{sup +} beam with an emittance of {approx}1 p-mm-mrad. We have successfully operated a 10-cm diameter surface ionization source together with an electrostatic quadrupole (ESQ) accelerator to meet these requirements. The pulse length is {approx}4 {micro}s, firing at once every 10-15 seconds. By optimizing the extraction diode and the ESQ voltages, we have obtained an output bea… more
Date: May 20, 2002
Creator: Kwan, J. W.; Bieniosek, F. M.; Henestroza, E.; Prost, L. & Seidl, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

RAD/COMM ''Cricket'' Test Report

Description: A series of tests were performed at Oak Ridge National Laboratory (ORNL) to evaluate and characterize the radiological response of a ''Cricket'' radiation detection system. The ''Cricket'' is manufactured by RAD/COMM Systems Corp., which is located in Ontario, Canada. The system is designed to detect radioactive material that may be contained in scrap metal. The Cricket's detection unit is mounted to the base of a grappler and monitors material, while the grappler's tines hold the material. It … more
Date: May 20, 2002
Creator: Chiaro, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Monitoring microbe-induced physical property changes using high-frequency acoustic waveform data: Toward the development of a microbial megascope

Description: A laboratory investigation was undertaken to determine the effect of microbe generated gas bubbles in controlled, saturated sediment columns utilizing a novel technique involving acoustic wave propagation. Specifically, the effect of denitrifying bacteria on saturated flow conditions was evaluated in light of the stimulated production of N{sub 2} gas and the resulting plugging of the pore throats. The propagation of high frequency acoustic waves through the sediment columns was used to locate t… more
Date: May 20, 2002
Creator: Williams, Kenneth Hurst
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Klystron 'efficiency loop' for the ALS storage ring RF system

Description: The recent energy crisis in California has led us to investigate the high power RF systems at the Advanced Light Source (ALS) in order to decrease the energy consumption and power costs. We found the Storage Ring Klystron Power Amplifier system operating as designed but with significant power waste. A simple proportional-integrator (PI) analog loop, which controls the klystron collector beam current, as a function of the output RF power, has been designed and installed. The design consideration… more
Date: May 20, 2002
Creator: Kwiatkowski, Slawomir; Julian, Jim & Baptiste, Kenneth
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Studies of grain boundaries in melt textured YBa{sub 2}Cu{sub 3}O{sub x}.

Description: [001] tilt grain boundaries were studied in bi-crystal samples of melt textured YBa{sub 2}Cu{sub 3}O{sub x}. Grain boundary critical current densities J{sub CB} were obtained from SQUID magnetization measurements on ring samples that contain the grain boundary. The dependence of J{sub CB} on oxygen stoichiometry and oxygen ordering were investigated and preliminary studies of grain boundary doping with selected cations, including Ca, Sr, and Bi were undertaken.
Date: May 20, 2002
Creator: Veal, B. W.; Claus, H.; Chen, L. & Paulikas, A. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Afghanistan: Current Issues and U.S. Policy Concerns

Description: The United States and its allies are helping Afghanistan emerging from more than 22 years of warfare, although substantial risk to Afghan stability remains. Before the U.S. military campaign against the orthodox Islamist Taliban movement began on October 7, 2001, Afghanistan had been mired in conflict since the Soviet invasion of Afghanistan in 1979. The defeat of the Taliban has enabled the United States and its coalition partners to send forces throughout Afghanistan to search for Taliban and… more
Date: May 20, 2002
Creator: Katzman, Kenneth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Former Soviet Union and U.S. Foreign Assistance

Description: Report covering support to Russia to support a transition to democracy and free market economics in the states of the former Soviet Union (FSU).Tthe United States, since December 1991, has offered roughly $8.2 billion in grants for economic and technical assistance to the region. Most of the grant assistance has been provided through the Agency for International Development (USAID). In addition, $4.8 billion has been provided in food aid through the Department of Agriculture, and $2.9 billion … more
Date: May 20, 2002
Creator: Tarnoff, Curt
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen