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316,722 Matching Results

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Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
IN-VIVO DIAGNOSIS OF CHEMICALLY INDUCED MELANOMA IN AN ANIMAL MODEL USING UV-VISIBLE AND NIR ELASTIC SCATTERING SPECTROSCOPY: PRELIMINARY TESTING. (open access)

IN-VIVO DIAGNOSIS OF CHEMICALLY INDUCED MELANOMA IN AN ANIMAL MODEL USING UV-VISIBLE AND NIR ELASTIC SCATTERING SPECTROSCOPY: PRELIMINARY TESTING.

Elastic light scattering spectroscopy (ESS) has the potential to provide spectra that contain both morphological and chromophore information from tissue. We report on a preliminary study of this technique, with the hope of developing a method for diagnosis of highly-pigmented skin lesions, commonly associated with skin cancer. Four opossums were treated with dimethylbenz(a)anthracene to induce both malignant melanoma and benign pigmented lesions. Skin lesions were examined in vivo using both UV-visible and near infrared (NIR) ESS, with wavelength ranges of 330-900 nm and 900-1700 nm, respectively. Both portable systems used identical fiber-optic probe geometry throughout all of the measurements. The core diameters for illuminating and collecting fibers were 400 and 200 {micro}m, respectively, with center-to-center separation of 350 {micro}m. The probe was placed in optical contact with the tissue under investigation. Biopsies from lesions were analyzed by two standard histopathological procedures. Taking into account only the biopsied lesions, UV-visible ESS showed distinct spectral correlation for 11/13 lesions. The NIR-ESS correlated well with 12/13 lesions correctly. The results of these experiments showed that UV-visible and NIR-ESS have the potential to classify benign and malignant skin lesions, with encouraging agreement to that provided by standard histopathological examination. These initial results show potential …
Date: January 1, 2001
Creator: A'AMAR, C.; LEY, R. & AL, ET
Object Type: Article
System: The UNT Digital Library
Development of Advanced Wear and Corrosion Resistant Systems Through Laser Surface Alloying and Materials Processing (open access)

Development of Advanced Wear and Corrosion Resistant Systems Through Laser Surface Alloying and Materials Processing

The stability of tungsten carbide particles in iron-rich and nickel-rich liquid during the laser surface alloying (LSA) process was investigated. Kinetic calculations indicate a rapid dissolution of tungsten carbide particles in iron-rich liquid, as compared with the dissolution rate in nickel-rich liquid. Optical microscopy indicated a heterogeneous microstructure around the tungsten particles that is in agreement with concentration gradients predicted by kinetic calculation. The work demonstrates the applicability of computational thermodynamics and kinetic models for the LSA process.
Date: April 1, 2002
Creator: A, Babu S S Martukanitz R P Parks K D David S
Object Type: Article
System: The UNT Digital Library
Comparison of ICEPEL predictions with single elbow flexible piping system experiment (open access)

Comparison of ICEPEL predictions with single elbow flexible piping system experiment

The ICEPEL Code for coupled hydrodynamic-structural response analysis of piping systems is used to analyze an experiment on the response of flexible piping systems to internal pressure pulses. The piping system consisted of two flexible Nickel-200 pipes connected in series through a 90/sup 0/ thick-walled stainless steel elbow. A tailored pressure pulse generated by a calibrated pulse gun is stabilized in a long thick-walled stainless steel pipe leading to the flexible piping system which ended with a heavy blind flange. The analytical results of pressure and circumferential strain histories are discussed and compared against the experimental data obtained by Stanford Research Institute.
Date: January 1, 1978
Creator: A-Moneim, M.T. & Chang, Y.W.
Object Type: Article
System: The UNT Digital Library
Computer simulation of LMFBR piping systems. [Accident conditions] (open access)

Computer simulation of LMFBR piping systems. [Accident conditions]

Integrity of piping systems is one of the main concerns of the safety issues of Liquid Metal Fast Breeder Reactors (LMFBR). Hypothetical core disruptive accidents (HCDA) and water-sodium interaction are two examples of sources of high pressure pulses that endanger the integrity of the heat transport piping systems of LMFBRs. Although plastic wall deformation attenuates pressure peaks so that only pressures slightly higher than the pipe yield pressure propagate along the system, the interaction of these pulses with the different components of the system, such as elbows, valves, heat exchangers, etc.; and with one another produce a complex system of pressure pulses that cause more plastic deformation and perhaps damage to components. A generalized piping component and a tee branching model are described. An optional tube bundle and interior rigid wall simulation model makes such a generalized component model suited for modelling of valves, reducers, expansions, and heat exchangers. The generalized component and the tee branching junction models are combined with the pipe-elbow loop model so that a more general piping system can be analyzed both hydrodynamically and structurally under the effect of simultaneous pressure pulses.
Date: January 1, 1977
Creator: A-Moneim, M.T.; Chang, Y.W. & Fistedis, S.H.
Object Type: Article
System: The UNT Digital Library
Nuclear physics with a medium-energy Electron-Ion Collider (open access)

Nuclear physics with a medium-energy Electron-Ion Collider

A polarized ep/eA collider (Electron-Ion Collider, or EIC) with variable center-of-mass energy {radical}s {approx} 20-70 GeV and a luminosity {approx}10{sup 34} cm{sup -2} s{sup -1} would be uniquely suited to address several outstanding questions of Quantum Chromodynamics (QCD) and the microscopic structure of hadrons and nuclei: (i) the three-dimensional structure of the nucleon in QCD (sea quark and gluon spatial distributions, orbital motion, polarization, correlations); (ii) the fundamental color fields in nuclei (nuclear parton densities, shadowing, coherence effects, color transparency); (iii) the conversion of color charge to hadrons (fragmentation, parton propagation through matter, in-medium jets). We briefly review the conceptual aspects of these questions and the measurements that would address them, emphasizing the qualitatively new information that could be obtained with the collider. Such a medium-energy EIC could be realized at Jefferson Lab after the 12 GeV Upgrade (MEIC), or at Brookhaven National Lab as the low-energy stage of eRHIC.
Date: June 1, 2012
Creator: A. Accardi, V. Guzey, A. Prokudin, C. Weiss
Object Type: Article
System: The UNT Digital Library
Raising Photoemission Efficiency with Surface Acoustic Waves (open access)

Raising Photoemission Efficiency with Surface Acoustic Waves

We are developing a novel technique that may help increase the efficiency and reduce costs of photoelectron sources used at electron accelerators. The technique is based on the use of Surface Acoustic Waves (SAW) in piezoelectric materials, such as GaAs, that are commonly used as photocathodes. Piezoelectric fields produced by the traveling SAW spatially separate electrons and holes, reducing their probability of recombination, thereby enhancing the photoemission quantum efficiency of the photocathode. Additional advantages could be increased polarization provided by the enhanced mobility of charge carriers that can be controlled by the SAW and the ionization of optically-generated excitons resulting in the creation of additional electron-hole pairs. It is expected that these novel features will reduce the cost of accelerator operation. A theoretical model for photoemission in the presence of SAW has been developed, and experimental tests of the technique are underway.
Date: July 1, 2012
Creator: A. Afanasev, F. Hassani, C.E. Korman, V.G. Dudnikov, R.P. Johnson, M. Poelker, K.E.L. Surles-Law
Object Type: Article
System: The UNT Digital Library
Epicyclic Twin-helix Magnetic Structure for Parametric-resonance Ionization Cooling (open access)

Epicyclic Twin-helix Magnetic Structure for Parametric-resonance Ionization Cooling

Para­met­ric-res­o­nance Ion­iza­tion Cool­ing (PIC) is en­vi­sioned as the final 6D cool­ing stage of a high-lu­mi­nos­i­ty muon col­lid­er. Im­ple­ment­ing PIC im­pos­es strin­gent con­straints on the cool­ing chan­nel's mag­net­ic op­tics de­sign. This paper pre­sents a lin­ear op­tics so­lu­tion com­pat­i­ble with PIC. Our so­lu­tion con­sists of a su­per­po­si­tion of two op­po­site-he­lic­i­ty equal-pe­ri­od and equal-strength he­li­cal dipole har­mon­ics and a straight nor­mal quadrupole. We demon­strate that such a sys­tem can be ad­just­ed to meet all of the PIC lin­ear op­tics re­quire­ments while re­tain­ing large ac­cep­tance.
Date: May 1, 2010
Creator: A. Afanasev, R.P. Johnson, Y.S. Derbenev, V.S. Morozov
Object Type: Article
System: The UNT Digital Library
Quadratic electroweak corrections for polarized Moller scattering (open access)

Quadratic electroweak corrections for polarized Moller scattering

The paper discusses the two-loop (NNLO) electroweak radiative corrections to the parity violating electron-electron scattering asymmetry induced by squaring one-loop diagrams. The calculations are relevant for the ultra-precise 11 GeV MOLLER experiment planned at Jefferson Laboratory and experiments at high-energy future electron colliders. The imaginary parts of the amplitudes are taken into consideration consistently in both the infrared-finite and divergent terms. The size of the obtained partial correction is significant, which indicates a need for a complete study of the two-loop electroweak radiative corrections in order to meet the precision goals of future experiments.
Date: January 1, 2012
Creator: A. Aleksejevs, S. Barkanova, Y. Kolomensky, E. Kuraev, V. Zykunov
Object Type: Article
System: The UNT Digital Library
Production and Testing Experience with the SRF Cavities for the CEBAF 12 GeV Upgrade (open access)

Production and Testing Experience with the SRF Cavities for the CEBAF 12 GeV Upgrade

The CEBAF recirculating CW electron linear accelerator at Jefferson Lab is presently undergoing a major upgrade to 12 GeV. This project includes the fabrication, preparation, and testing of 80 new 7-cell SRF cavities, followed by their incorporation into ten new cryomodules for subsequent testing and installation. In order to maximize the cavity Q over the full operable dynamic range in CEBAF (as high as 25 MV/m), the decision was taken to apply a streamlined preparation process that includes a final light temperature-controlled electropolish of the rf surface over the vendor-provided bulk BCP etch. Cavity processing work began at JLab in September 2010 and will continue through December 2011. The excellent performance results are exceeding project requirements and indicate a fabrication and preparation process that is stable and well controlled. The cavity production and performance experience to date will be summarized and lessons learned reported to the community.
Date: September 1, 2011
Creator: A. Burrill, G.K. Davis, F. Marhauser, C.E. Reece, A.V. Reilly, M. Stirbet
Object Type: Article
System: The UNT Digital Library
The Muon LINAC for the International Design Study of the Neutrino Factory (open access)

The Muon LINAC for the International Design Study of the Neutrino Factory

The first stage of muon acceleration in the Neutrino Factory utilises a superconducting linac to accelerate muons from 244 MeV to 900 MeV. The linac was split into three types of cryomodules with decreasing magnetic fields and increasing amounts of RF voltage but with the design of the superconducting solenoid and RF cavities being the same for all cryomodules. The current status of the muon linac for the International Design Study for the Neutrino Factory will be presented including a final lattice design of the linac and tracking simulations.
Date: September 1, 2011
Creator: A. Kurup, C. Bontoiu, Morteza Aslaninejad, J. Pozimski, A. Bogacz, V.S. Morozov, Y.R. Roblin, K.B. Beard
Object Type: Article
System: The UNT Digital Library
[Invoice for Balance Due to A. Levy, March 1952] (open access)

[Invoice for Balance Due to A. Levy, March 1952]

Invoice for balance due to A. Levy by D. W. Kempner, including amount of $20.1.
Date: March 1, 1952
Creator: A. Levy Wholesale and Retail Dealer
Object Type: Text
System: The Portal to Texas History
Results from an FPIX0 chip bump-bonded to an atlas pixel detector (open access)

Results from an FPIX0 chip bump-bonded to an atlas pixel detector

Results are presented of tests performed on the first pixel detector readout ASIC designed at Fermilab (FPIX0).
Date: October 1, 1998
Creator: A. Mekkaoui, D. Christian, S. Kwan, J Srage and R. Yarema
Object Type: Article
System: The UNT Digital Library
[Brownsville Courthouse and Post Office Foundation]

[Brownsville Courthouse and Post Office Foundation]

Photograph of construction of the foundation of the Brownsville U.S. court house and post office, showing a large building site dug into the ground with another building on the street above in the background. In the foreground there is a large puddle with pieces of lumber scattered around it and part of a crane on the far right. Farther back tho horses are standing and two construction workers are standing in front of the site wall while several other men are sitting on the ground above in front of a large wall. In the background on the right there is a small structure with stairs next to a wooden wall and several trees and a JC Penney building can be seen on the street behind them. A text on the front of the postcard reads: "A. Rogers Photo. 11-1-1931."
Date: October 1, 1931
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Brownsville Courthouse and Post Office From Tenth Street]

[Brownsville Courthouse and Post Office From Tenth Street]

Photograph of the Brownsville Federal Building and post office, a four-story brick building, taken from across the street. In the foreground several automobiles are parked on both sides of the street and part of a store front can be seen on the left. One of the cars in front has a label on the spare tire covering that reads "Clark Electric Shop" and telephone lines and palm trees are also visible in front of the building.
Date: November 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Brownsville Courthouse From Elizabeth Street]

[Brownsville Courthouse From Elizabeth Street]

Photograph from above of the Brownsville U.S. courthouse and post office, a large four-story brick and stone building with four rows of windows, a flagpole on the facade, and three arched entryways in the middle of the first floor. In foreground a ladder and other building materials are visible on the sidewalk in front of the building, there is a shed on the right, and on the far right a crane can be seen in the alleyway next to the post office.
Date: November 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Brownsville Demolition of Courthouse]

[Brownsville Demolition of Courthouse]

Photograph of the demolition of the Brownsville first Federal Courthouse. It was demolished to build the second Federal Courthouse and Post Office. The first floor has an arched doorway in the middle and several arch-shaped windows on either side and the second story has several rectangular windows on both sides. In front of the building a man is standing in front of a pile of lumber and other materials next to a tree. In the foreground there are several large stacks of bricks and on the right another building with two chimneys is partially visible.
Date: October 1, 1931
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Brownsville Federal Building]

[Brownsville Federal Building]

Photograph of the Brownsville Federal Building and post office, a four-story brick building, taken from across the street. In the foreground several automobiles are parked on both sides of the street and part of a store front can be seen on the left. One of the cars in front has a label on the spare tire covering that reads "Clark Electric Shop" and telephone lines and palm trees are also visible in front of the building.
Date: November 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Brownsville Post Office and Courthouse]

[Brownsville Post Office and Courthouse]

Photograph of construction on the Brownsville U.S. courthouse and post office, a building consisting of two incomplete stories and no roof. The left part of the building is only a single floor and has a large pole on top of it while the part on the right has two floors. In front of the building on the left several people are standing in the street in front of the sidewalk, which is covered in debris, and on the right cars are parked on the side of the street. Next to the post office on the right is another building with a sign that reads "Kress Store" and on the left another building and telephone lines are visible. A text on the front of the photograph reads " Rogers Photo 10-01-1931."
Date: October 1, 1931
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Brownsville Post Office North and South Walls]

[Brownsville Post Office North and South Walls]

Photograph of the back of the Brownsville U.S. post office, a multi-story brick building with several rows of windows without glass in them. A man is partially visible through the window on the right and another man is on top of the roof on the far left. In the foreground there are several stacks of bricks and other building materials in front of the building and on the left two parked automobiles can be seen.
Date: June 1, 1926
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Constructing Brownsville U.S. Courthouse and Post Office]

[Constructing Brownsville U.S. Courthouse and Post Office]

Photograph of the construction of the Brownsville U.S. courthouse and post office, consisting of a foundation and support beams for several stories and a roof. In the foreground there is lamppost on the corner and lumber and other building materials on the sidewalk in front of the building.
Date: April 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Construction of Federal Building and Post Office]

[Construction of Federal Building and Post Office]

Photograph of construction of the Brownsville federal building and post office, a multi story building that consists of support beams with no walls or floors. On the right there is a crane and in the foreground there is a long temporary structure running parallel to the road. In the background other buildings and houses are partially visible behind the building.
Date: April 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Construction of Post Office]

[Construction of Post Office]

Photograph of construction of the Brownsville U.S. post office, which consists of two completed stories without a roof. The building has a row of rectangular windows on the second story and arch-shaped windows on the first story. Directly in front of the building a man is standing in front of a pile of lumber next to a tree. In the foreground two workers can be seen behind a stack of bricks and there are several more stacks of bricks on the left and right and house is partially visible in the background.
Date: October 1, 1931
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Construction of Post Office Foundation]

[Construction of Post Office Foundation]

Photograph of construction of the foundation of the Brownsville post office. In the foreground there is a large puddle with lumber and other materials scattered around it and what appears to be a steam-powered machine behind it on the right. In the middle several construction workers are standing space far apart and part of a crane can be seen on the far left. In the background there is wall made of wooden planks and a small building with stairs leading up to it and behind it a large multi-story building and treetops are visible.
Date: January 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History
[Construction of Post Office in Brownsville]

[Construction of Post Office in Brownsville]

Photograph of construction of the Brownsville post office showing work on the foundation. In the foreground there is a large puddle with pieces of lumber in and around it and several construction workers standing next to various piles of lumber in the middle. On the right what appears to be a large machine is visible and in the back there is a long wall on another level and a small building with stairs leading up to it on the left. In the background another large building and trees can be seen.
Date: January 1, 1932
Creator: A. Rogers Studio
Object Type: Photograph
System: The Portal to Texas History