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Light-Front Holography and Novel Effects in QCD

Description: The correspondence between theories in anti-de Sitter space and conformal field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. We identify the AdS coordinate z with an invariant light-front coordin… more
Date: December 18, 2008
Creator: Brodsky, Stanley J. & de Teramond, Guy F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coherent x-ray lasers for applications

Description: Many of the projected applications of x-ray lasers require high quality output radiation with properties such as short wavelength, high power, good focusability, short pulse, and high degree of coherence. We discuss the requirements of an x-ray laser for the application of holography of biological samples. We present ideas for achieving these properties. Given that population inversions can be established to provide laser gain, we discuss how the propagation and amplification of x-rays within t… more
Date: December 1, 1990
Creator: London, R. A.; Amendt, P.; Rosen, M. D.; Feit, M. D.; Fleck, J. A. (Lawrence Livermore National Lab., CA (USA)) & Strauss, M. (Negev Nuclear Research Centre, Beersheba (Israel))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A survey of potential low-cost concentrator concepts for use in low-temperature water detoxification

Description: Several different concentrator concepts have been considered for use in the detoxification of chemically contaminated water. The reactions of interest are predominantly photocatalytic in nature and are driven by low concentrations (between 1 and 50 suns) of UV radiation in the 300- to 385-nm wavelength range. Optical performance characteristics of these concentrators are thus somewhat different compared to concentrators developed for industrial process heat and electrical energy production. Rel… more
Date: December 1, 1991
Creator: Wendelin, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress and Prospects in Soft X-Ray Holographic Microscopy

Description: We report some of the latest developments in x-ray holography experiments and make some speculations about the limits of performance of the approaches currently in use. We also make some suggestions about where the technique can (and cannot) go in the future. 32 refs., 5 figs., 1 tab.
Date: December 1987
Creator: Howells, M. R.; Jacobsen, C.; Kirz, J.; McQuaid, K. & Rothman, S. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam line for experiments with coherent soft x-rays

Description: The advantages of coherent soft x-rays for three-dimensional imaging of biological specimens are discussed, the x-ray source requirements are described, and the general design of the beam line and its optical system are given. (WHK)
Date: December 1, 1982
Creator: Howells, M.R.; Kirz, J. & Krinsky, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coherent optical methods for metallography

Description: Numerous methods based on coherent optical techniques have been developed over the past two decades for nondestructive evaluation, vibration analysis and experimental mechanics. These methods have a great deal of potential for the enhancement of metallographic evaluations and for materials characterization in general. One such technique described in this paper is the determination of the material damping factors in metals. Damping loss factors as low as 10-5 were measured on bronze and aluminum… more
Date: December 31, 1991
Creator: Pechersky, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Genome sequencing by direct imaging x-ray color holography. Appendix A

Description: Currently available techniques for sequencing DNA are inadequate for oligonucleotides of length greater than 600 nucleotides and are most effective in the 300 nucleotide range. Automated sequencers are now available which use, basically, the Sanger dideoxy termination method. The sequencing rates of these conventional methods are extremely low and involve very labor intensive procedures, requiring on the order of two man-years of effort for the determination of the sequence of a single 100 kilo… more
Date: December 31, 1989
Creator: Haddad, W.; Boyer, K.; Solem, J. C.; Rhodes, C. K. & Moriarty, R. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Light-Front Holography, AdS/QCD, and Hadronic Phenomena

Description: AdS/QCD, the correspondence between theories in a modified five-dimensional anti-de Sitter space and confining field theories in physical space-time, provides a remarkable semiclassical model for hadron physics. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. We identify the AdS coordinate z with … more
Date: December 9, 2009
Creator: Brodsky, Stanley J. & de Teramond, Guy F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Holographic Protection of Chronology in Universes of the Godel Type

Description: We analyze the structure of supersymmetric Godel-like cosmological solutions of string theory. Just as the original four-dimensional Godel universe, these solutions represent rotating, topologically trivial cosmologies with a homogeneous metric and closed timelike curves. First we focus on"phenomenological" aspects of holography, and identify the preferred holographic screens associated with inertial comoving observers in Godel universes. We find that holography can serve as a chronol… more
Date: December 7, 2002
Creator: Boyda, Edward; Ganguli, Surya; Horava, Petr & Varadarajan, Uday
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Light-Front Holography and Non-Perturbative QCD

Description: The combination of Anti-de Sitter space (AdS) methods with light-front holography leads to a semi-classical first approximation to the spectrum and wavefunctions of meson and baryon light-quark bound states. Starting from the bound-state Hamiltonian equation of motion in QCD, we derive relativistic light-front wave equations in terms of an invariant impact variable {zeta} which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. These equat… more
Date: December 9, 2009
Creator: Brodsky, Stanley J. & de Teramond, Guy F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hamiltonian Light-front Field Theory Within an AdS/QCD Basis

Description: Non-perturbative Hamiltonian light-front quantum field theory presents opportunities and challenges that bridge particle physics and nuclear physics. Fundamental theories, such as Quantum Chromodynamics (QCD) and Quantum Electrodynamics (QED) offer the promise of great predictive power spanning phenomena on all scales from the microscopic to cosmic scales, but new tools that do not rely exclusively on perturbation theory are required to make connection from one scale to the next. We outline rec… more
Date: December 16, 2009
Creator: Vary, J.P.; Honkanen, H.; Li, Jun; Maris, P.; U., /Iowa State; Brodsky, S.J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Light-Front Holography and Gauge/Gravity Duality: The Light Meson and Baryon Spectra

Description: Starting from the bound state Hamiltonian equation of motion in QCD, we derive relativistic light-front wave equations in terms of an invariant impact variable {zeta} which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. These equations of motion in physical space-time are equivalent to the equations of motion which describe the propagation of spin-J modes in anti-de Sitter (AdS) space. Its eigenvalues give the hadronic spectrum, and it… more
Date: December 9, 2009
Creator: de Teramond, Guy F.; U., /Costa Rica & Brodsky, Stanley J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Generation of low-divergence laser beams

Description: This invention is comprised of an apparatus for transforming a conventional beam of coherent light, having a Gaussian energy distribution and relatively high divergence, into a beam in which the energy distribution approximates a single, non-zero-order Bessel function and which therefore has much lower divergence. The apparatus comprises a zone plate having transmitting and reflecting zones defined by the pattern of light interference produced by the combination of a beam of coherent light with… more
Date: December 1992
Creator: Kronberg, J. W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Experimental demonstration of high resolution three-dimensional x-ray holography

Description: Tomographic x-ray holography may make possible the imaging of biological objects at high resolution in three dimensions. We performed a demonstration experiment with soft x-rays to explore the feasibility of this technique. Coherent 3.2-nm undulator radiation was used to record Fourier transform holograms of a microfabricated test object from various illumination angles. The holograms were numerically reconstructed according to the principles of diffraction tomography, yielding images of the ob… more
Date: December 1, 1992
Creator: McNulty, I.; Trebes, J. E.; Brase, J. M.; Yorkey, T. J.; Levesque, R.; Szoke, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Millimeter wave, high-resolution, holographic surveillance system

Description: Millimeter wave holographic imaging systems capable of imaging through clothing to detect contraband, metal, plastic, or ceramic weapons may provided a practical solution to personnel inspection needs in mass transportation centers. Traditional inspection systems, such as metal detectors and x-ray imaging systems, have limitations for the detection of concealed weapons. metal detectors are limited because they cannot detect plastic weapons and x-ray imaging systems are limited in use due to rad… more
Date: December 1, 1993
Creator: McMakin, D. L.; Sheen, D. M.; Collins, H. D.; Hall, T. E.; Smith, R. R. & Droppo, J. G. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Establishment of the Center for Biomedical Technology Innovation

Description: The report discussed the following topics: (1) Orthopedic Devices; (2) Hybrid Vector and Method Resulting in Protein Overproduction by Eukaryotic Cells; (3) Surgical Simulator; (4) CBTI (Center for Biomedical Technology Innovation) as an Incubator for Start-up Companies; (5) Voice-activated, computer-assisted surgical robotics; (6) Through transmission ultrasonic 3-D holography for diagnostic imaging; (7) CBTI's Scibermed{trademark} Virtual Institute (SVI); and (8) Laser Oxygenation Tomography.
Date: December 15, 2001
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High temperature metallic diffraction gratings and process of manufacturing same

Description: This invention is comprised of a method of applying diffraction gratings or images directly to the surface of a substrate wherein the gratings or images are capable of withstanding high temperatures, pressures, humidity and other such conditions related to materials testing. The method includes coating the surface of the substrate with an uniform layer of metal which is then overlaid with a layer of photo-resist material. Next, after contacting the photo-resist material with a master image cont… more
Date: December 31, 1993
Creator: Deason, V. A.; Hsu, Karen M. & Miller, R. L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Effect of Fracture Surface Roughness on Shear Crack Growth. Progress Report, August 1, 1991--May 31, 1992

Description: A model of fracture surface interference for Mode I fatigue crack profiles was developed and evaluated. Force required to open the crack faces is estimated from point contact expressions for Mode I stress intensity factor. Force transfer across contacting asperities is estimated and used to calculate Mode II resistance stress intensity factor (applied factor is sum of effective and resistance factors). Electro-optic holographic interferometry was used to measure 3-D displacement field around a … more
Date: December 1, 1992
Creator: Gross, Todd S.; Watt, David W. & Mendelsohn, Daniel A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Fracture Surface Roughness on Shear Crack Growth

Description: A model of fracture surface interference for Mode I fatigue crack profiles was developed and evaluated. Force required to open the crack faces is estimated from point contact expressions for Mode I stress intensity factor. Force transfer across contacting asperities is estimated and used to calculate Mode II resistance stress intensity factor (applied factor is sum of effective and resistance factors). Electro-optic holographic interferometry was used to measure 3-D displacement field around a … more
Date: December 1, 1992
Creator: Gross, Todd.S.; Watt, David W. & Mendelsohn, Daniel A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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