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Measurement of the gamma gamma* to eta_c transition form factor

Description: The authors study the reaction e{sup +}e{sup -} {yields} e{sup +}e{sup -} {eta}{sub c}, {eta}{sub c} {yields} K{sub S}K{sup {+-}}{pi}{sup {-+}} and obtain {eta}{sub c} mass and width values 2982.2 {+-} 0.4 {+-} 1.6 MeV/c{sup 2} and 31.7 {+-} 1.2 {+-} 0.8 MeV, respectively. They find {Lambda}({eta}{sub c} {yields} {gamma}{gamma}){Beta}({eta}{sub c} {yields} K{bar K}{pi}) = 0.374 {+-} 0.009 {+-} 0.031 keV, and measure the {gamma}{gamma}* {yields} {eta}{sub c} transition form factor in the momentu… more
Date: April 28, 2010
Creator: Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J.; Grauges, E. et al.
Partner: UNT Libraries Government Documents Department
open access

Robocasting of Ceramics and Composites Using Fine Particle Suspensions

Description: Solid freeform fabrication is the near-net-shape manufacturing of components by sequentially stacking thin layers of material until complicated three dimensional shapes are produced. The operation is computer controlled and requires no molds. This exciting new field of technology provides engineers with the ability to rapidly produce prototype parts directly from CAD drawings and oftentimes little or no machining is necessary after fabrication. Techniques for freeform fabrication with several t… more
Date: October 28, 1999
Creator: Cesarano, Joseph, III
Partner: UNT Libraries Government Documents Department
open access

Performance of the Diagnostics for NSLS-II LINAC Commissioning

Description: The National Synchrotron Light Source II (NSLS-II) is a state of the art 3-GeV third generation light source currently under construction at Brookhaven National Laboratory. The NSLS-II injection system consists of a 200 MeV linac, a 3-GeV booster synchrotron and associated transfer lines. The transfer lines not only provide a means to deliver the beam from one machine to another, they also provide a suite of diagnostics and utilities to measure the properties of the beam to be delivered. In thi… more
Date: March 28, 2011
Creator: Fliller, R. P., III; Padrazo, D.; Wang, G. M.; Heese, R.; Hseuh, H. C.; Johanson, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Simulations of Transverse Stacking in the NSLS-II Booster

Description: The NSLS-II injection system consists of a 200 MeV linac and a 3 GeV booster. The linac needs to deliver 15 nC in 80 - 150 bunches to the booster every minute to achieve current stability goals in the storage ring. This is a very stringent requirement that has not been demonstrated at an operating light source. We have developed a scheme to transversely stack two bunch trains in the NSLS-II booster in order to alleviate the charge requirements on the linac. This scheme has been outlined previou… more
Date: March 28, 2011
Creator: Fliller, R., III & Shaftan, T.
Partner: UNT Libraries Government Documents Department
open access

Design of the NSLS-II Linac Front End Test Stand

Description: The NSLS-II operational parameters place very stringent requirements on the injection system. Among these are the charge per bunch train at low emittance that is required from the linac along with the uniformity of the charge per bunch along the train. The NSLS-II linac is a 200 MeV linac produced by Research Instruments Gmbh. Part of the strategy for understanding to operation of the injectors is to test the front end of the linac prior to its installation in the facility. The linac front end … more
Date: March 28, 2011
Creator: Fliller, R., III; Johanson, M.; Lucas, M.; Rose, J. & Shaftan, T.
Partner: UNT Libraries Government Documents Department
open access

Monitoring Neutron Generator Output in a Mixed Neutron-Gamma Field Using a Plastic Scintillator.

Description: Quantitative neutron-induced gamma-ray spectroscopy employing neutron generators (NGs) entails monitoring them for possible fluctuations in their neutron output. We accomplished this using a plastic scintillator and recording a spectrum from which we selected a neutron region-of-interest (nROI) to discriminate between neutrons and the accompanying high-energy gamma-rays. We show that the selected nROI is insensitive to changes in the gamma-ray background, thus allowing satisfactory normalizatio… more
Date: October 28, 2007
Creator: Mitra, S. & Wielopolski, L.
Partner: UNT Libraries Government Documents Department
open access

Stable, free-standing Ge nanocrystals

Description: Free-standing Ge nanocrystals that are stable under ambient conditions have been synthesized in a two-step process. First, nanocrystals with a mean diameter of 5 nm are grown in amorphous SiO{sub 2} by ion implantation followed by thermal annealing. The oxide matrix is then removed by selective etching in diluted HF to obtain free-standing nanocrystals on a Si wafer. After etching, nanocrystals are retained on the surface and the size distribution is not significantly altered. Free-standing nan… more
Date: January 28, 2005
Creator: Sharp, I. D.; Xu, Q.; Liao, C. Y.; Yi, D. O.; Beeman, J. W.; Liliental-Weber, Z. et al.
Partner: UNT Libraries Government Documents Department
open access

Materials Education: Opportunities over a Lifetime

Description: A report, in the form of abbreviated notes, of the 17th Biennial Conference on National Materials Policy ''Materials Education: Opportunities over a Lifetime'' held May 20-21, 2002 in College Park, MD, sponsored by the Federation of Materials Societies and the University Materials Council.
Date: October 28, 2003
Creator: Anderson, Iver E.; Schwartz, Lyle H.; Faber, Katherine T.; Cargill, G. Slade, III & Houston, Betsy
Partner: UNT Libraries Government Documents Department
open access

Measurement and Prediction of H2O Outgassing Kinetics from Silica-Filled Polydimethylsiloxane TR55 and S5370

Description: The isoconversional technique was employed for the measurement and prediction of H2O outgassing kinetics from silica-filled polydimethylsiloxane TR55 and S5370 in a vacuum or dry environment. Isoconversional analysis indicates that the energy barrier for H2O release from TR55 and S5370 is an increasing function of the fractional H2O release. This can be interpreted as the release of H2O from physisorbed water and then chemisorbed water with decreasing OH density from the surfaces of the embedde… more
Date: August 28, 2006
Creator: Dinh, L. N.; Burnham, A. K.; Schildbach, M. A.; Smith, R. A.; Maxwell, R. S.; Balazs, B. et al.
Partner: UNT Libraries Government Documents Department
open access

Surface Engineering of Silicon and Carbon by Pulsed-Laser Ablation

Description: Experiments are described in which a focused pulsed-excimer laser beam is used either to ablate a graphite target and deposit hydrogen-free amorphous carbon films, or to directly texture a silicon surface and produce arrays of high-aspect-ratio silicon microcolumns. In the first case, diamond-like carbon (or tetrahedral amorphous carbon, ta-C) films were deposited with the experimental conditions selected so that the masses and kinetic energies of incident carbon species were reasonably well co… more
Date: February 28, 1999
Creator: Fowlkes, J.D.; Geohegan, D.B.; Jellison, G. E., Jr.; Lowndes, D.H.; Merkulov, V.I.; Pedraza, A.J. et al.
Partner: UNT Libraries Government Documents Department
open access

First Results for a Superconducting Imaging-Surface Sensor Array for Magnetocardiography

Description: The authors have completed fabrication and preliminary testing of a 12-channel SQUID array using the superconducting image-surface gradiometer concept. Sensor response to point dipole magnetic sources, and uniform fields used to simulate ambient magnetic fields followed predicted values to high precision. Edge effects were not observed for sources, within 5cm of the center of the imaging surface independent of whether the source is close or far from the surface. The superconducting imaging-surf… more
Date: August 28, 1998
Creator: Kraus, R. H., Jr.; Flynn, E. R.; Espy, M. A.; Matlachov, A.; Overton, W.; Wood, C. C. et al.
Partner: UNT Libraries Government Documents Department
open access

3D finite-difference frequency-domain code for electromagnetic induction tomography

Description: The effect of shrapnel on target chamber components and experiments at large lasers such as the National Ignition Facility at LLNL and the Megajoule Laser at CESTA in France is an important issue in fielding targets and exposure samples. Modeling calculations are likely to be an important component of this effort. Some work in this area has been performed by French workers, who are collaborating with the LLNL on many issues relating to target chamber, experiment-component, and diagnostics survi… more
Date: July 28, 1999
Creator: Berryman, J. G.; Champagne, N. J., II & Buettner, H. M.
Partner: UNT Libraries Government Documents Department
open access

Did Anything Good Come Out of the Pandemic? COVID-19-Stress Induced Self-Regulatory Sustainable Apparel Consumption among the Millennials in the U.S.

Description: Authors of the article proposed and tested a conceptual model delineating the relationships between COVID-19 stress, commitment to the environment, and intentions for sustainable apparel consumption in terms of intentions for purchasing sustainable apparel and divesting apparel. The authors recommend the sustainable apparel brands and marketers promote how sustainable apparel consumption can protect the environment to make the environment and human beings less susceptible to the future outbreak… more
Date: April 28, 2023
Creator: Chakraborty, Swagata & Sadachar, Amrut
Partner: University of North Texas
open access

Analyzing influence of COVID-19 on crypto & financial markets and sentiment analysis using deep ensemble model

Description: Article describes how COVID-19 affected the world's economy severely and increased the inflation rate in both developed and developing countries. This study performs an analysis of the impact of COVID-19 on public opinion and sentiments regarding the financial markets and crypto markets.
Date: September 28, 2023
Creator: Washington, Patrick Bernard; Gali, Pradeep; Rustam, Furqan & Ashraf, Imran
Partner: UNT College of Engineering
open access

A multiscale approach reveals elaborate circulatory system and intermittent heartbeat in velvet worms (Onychophora)

Description: Article describes how an antagonistic hemolymph-muscular system is essential for soft-bodied invertebrates. The authors analyzed the entire circulatory system of the peripatopsid Euperipatoides rowelli and claimed they discovered a surprisingly elaborate organization.
Date: April 28, 2023
Creator: Jahn, Henry; Hammel, Jörg U.; Göpel, Torben; Wirkner, Christian S. & Mayer, Georg
Partner: UNT College of Science
open access

District Office Leadership Supporting Site-Level Teacher Collaborative Teams

Description: Article describes how previous researchers examining professional learning communities (PLCs) claim that effective building-level PLCs improve teacher collaboration and student achievement. Using an online survey, the authors investigated the claim that district office support enhances the success of site-level PLCs.
Date: October 28, 2023
Creator: Voelkel Jr., Robert H.; Johnson, Christie W. & Nadeem, Fiaz
Partner: UNT College of Education
open access

Complexity Synchronization of Organ Networks

Description: Article describes how the transdisciplinary nature of science as a whole became evident as the necessity for the complex nature of phenomena to explain social and life science, along with the physical sciences, blossomed into complexity theory and most recently into complexitysynchronization. The authors use the scaling of empirical datasets from the brain, cardiovascular and respiratory networks to support the hypothesis that complexity synchronization occurs between scaling indices or equival… more
Date: September 28, 2023
Creator: West, Bruce J.; Grigolini, Paolo; Kerick, Scott E.; Franaszczuk, Piotr J. & Mahmoodi, Korosh
Partner: UNT College of Science
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