Results 11 to 20 of about 1,559,138 (346)

Dual symmetry and the vacuum energy [PDF]

Physical Review D, 1998
In this work we present a new hidden symmetry in gravity for the scale factor in the FRW model, for $k=0$. This exact symmetry vanishes the cosmological constant.
A. Giveon, A. Messiach, C. Kounnas, C.W. Misner, G.W. Gibbons, J. A. Nieto, J. Hartle, J. J. Rosales, J. Socorro, K. Kikkawa, M.J. Duff, P. Candelas, R. Jackiw, S. Coleman, S. Deser, S. Ferrara, S. Weinberg, T.M. Dunster, T.S. Bunch, V. I. Tkach, V.I. Tkach, V.I. Tkach, V.I. Tkach, V.P. Nair   +23 more
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LAMPF Dual-Energy Operation [PDF]

IEEE Transactions on Nuclear Science, 1981
The Los Alamos Meson Physics Facility (LAMPF) operated with simultaneous H+ and H- beams until June 1980, when a method of providing a variable energy H- beam as well as a full-energy H+ beam was brought into use. The scheme is based on time sharing between H+ and H- beam pulses.
D. C. Hagerman, R. E. Hill, W.T. Hunter, R. Macek, O.B. van Dyck   +4 more
openalex   +4 more sources

[Dual-energy CT]. [PDF]

Ugeskrift for laeger, 2021
Dual-energy CT (DECT) is an emerging imaging technique and has become increasingly available in Danish hospitals in recent years. DECT utilizes data acquired from high and low kV photons. This allows for the separation of materials based on their atomic buildup, which can be visualised and quantified during post-processing.
Xu, Jack Junchi, Hansen, Kristoffer Lindskov, Lönn, Lars, Resch, Timothy, Ulriksen, Peter Sommer   +4 more
openaire   +1 more source

New CBCT Indications in Musculoskeletal Imaging

Journal of the Belgian Society of Radiology, 2021
Cone-beam computed tomography (CBCT) has become increasingly important as a low-radiation imaging technique with high resolution. The current new generation CBCT’s aim to optimize the benefits of CBCT while limiting the traditional disadvantages with ...
Cedric Werbrouck, Mermuys Koen, Jan Casselman   +2 more
doaj   +1 more source

Dual-energy subtraction mammography [PDF]

Journal of Digital Imaging, 1995
Dual-energy subtraction mammography was performed for breast examinations. To obtain a dual-energy subtraction image with a digital radiography unit, high- and low-energy images were obtained at an appropriate time interval under different x-ray exposure conditions.
Taroh Asaga, Chihiro Masuzawa, Hirofumi Matsuura, Akira Yoshida   +3 more
openaire   +3 more sources

Dual Energy X-ray Methods for the Characterization, Quantification and Imaging of Calcification Minerals and Masses in Breast

Crystals, 2020
Dual energy (DE) technique has been used by numerous studies in order to detect breast cancer in early stages. Although mammography is the gold standard, the dual energy technique offers the advantage of the suppression of the contrast between adipose ...
Niki Martini, Vaia Koukou, Christos Michail, George Fountos   +3 more
doaj   +1 more source

Differences in Body Composition Analysis by DEXA, Skinfold and BIA Methods in Young Football Players

Children, 2022
The most widely used method in professional sports for fat percentage assessment is the skinfold method. However, there is the chance of bias and human error.
José Francisco Tornero-Aguilera, Bella Esperanza Villegas-Mora, Vicente Javier Clemente-Suárez   +2 more
doaj   +1 more source

Virtual non-contrast images of detector-based spectral computed tomography in dogs: a promising alternative to true non-contrast images in veterinary medicine

Frontiers in Veterinary Science, 2023
IntroductionIn veterinary medicine, abdominal computer tomographic (CT) examinations regularly require a minimum of two scans, with a native scan (true unenhanced, TUE) as a reference for the subsequent contrast-enhanced CT scan (CECT). Spectral detector
Philipp Lietz, Manon Brüntgens, Adriano Wang-Leandro, Holger Andreas Volk, Sebastian Meller, Kristina Merhof   +5 more
doaj   +1 more source

Open String Thermodynamics and D-Branes [PDF]

, 1996
We study the thermodynamics of open superstrings in the presence of $p$-dimensional D-branes. We get some finite temperature dualities relating the one-loop canonical free energy of open strings to the self-energy of D-branes at dual temperature. For the
Atick, Barbón, Bianchi, Bianchi, Dai, Dolan, Erdelyi, Green, Green, Green, Horava, Horava, Kapusta, Leigh, M.A. Vázquez-Mozo, McClain, O'Brien, Osorio, Polchinski, Polchinski, Polchinski, Polchinski, Rohm, Sagnotti, Witten, Álvarez, Álvarez, Álvarez   +27 more
core   +4 more sources

Self-Dual Chern-Simons Theories [PDF]

, 1994
In these lectures I review classical aspects of the self-dual Chern-Simons systems which describe charged scalar fields in $2+1$ dimensions coupled to a gauge field whose dynamics is provided by a pure Chern-Simons Lagrangian. These self-dual models have
Dunne, Gerald
core   +3 more sources