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209288 documents, page 1 of 20929

Critical Behavior at the Chiral Phase Transition

Bernard, C.; Blum, T.; DeTar, C. E.; Heller, U. M.; Gottlieb, S.; Hetrick, J. E.; Jegerlehner, Beat; Rummukainen, K.; Sugar, R. L.; Toussaint, D.; Wingate, M. (1997)
Quantum chromodynamics with two zero mass flavors is expected to exhibit a phase transition with O(4) critical behavior. Fixing the universality class is important for phenomenology and for facilitating the extrapolation of simulation data to physical quark mass values. At Lattice '96 the Tsukuba and Bielefeld groups reported results from new simulations with dynamical staggered quarks at $N_t = 4$, which suggested a departure from the expected critical behavior. We report observations of sim...

Charge-localized p-phenylenedihydrazine radical cations: ESR and optical studies of intramolecular electron transfer rates

Nelsen, Stephen F.; Ismagilov, Rustem F.; Powell, Douglas R. (1997)
1,4-Bis(2-tert-butyl-2,3-diazabicyclo[2.2.2]oct-3-yl)benzene-1,4-diyl (2) its 2,5-dimethyl and 2,3,5,6-tetramethyl derivatives (3 and 4), their radical cations, and bis-radical dications are studied. Crystal structures including those of 2^+BPh_4^-, 3^(2+)(BPh_4^-)_2, 4^+BPh_4^-, and 4^(2+)(BPh_4^-)_2 establish that ring methylation causes more N-lone pair, aryl π twist without changing the NAr,NAr distance significantly and that both 2^+ and 4^+ have the charge localized in one hydrazine uni...

An Analysis of the Statistics of the Hubble Space Telescope Kuiper Belt Object Search

Brown, Michael E.; Kulkarni, Shrinivas R.; Liggett, Timothy J. (1997)
We calculate statistical limits to the detection of Kuiper belt objects in the Hubble Space Telescope (HST) data of Cochran et al., in which they report the discovery of a population of Halley-sized objects in Pluto-like orbits. Detection of a population of faint objects in these data is limited by the number of false objects that appear owing only to random noise; the number of real objects must exceed the uncertainty in the number of these false objects for the population to be observable. ...

Études de cristaux scintillants de tungstate de plomb et de prototypes de calorimètre électromagnétique pour le projet CMS au LHC

Gautheron, F (1997)
The CMS detector which will be installed on the LHC is equiped with an electromagnetic calorimeter made of about 110.000 lead tungstate crystals (PbWO4) read out by avalanche photodiodes. The choice of such photodetectors with gain is dictated by the low level of light yield from the scintillation and by the presence of a high magnetic field. This thesis reports on the work done on the crystal in order to improve its characteristics in view of the construction for a high performance calorimet...

Chemotaxonomic analysis of phytoplankton distribution in the Indian sector of the Southern Ocean during late austral summer

Cailliau, C; Claustre, H; Giannino, S (1997)
An analysis of chlorophyll alpha and of taxon-specific pigments, as measured by High Performance Liquid Chromatography (HPLC), revealed the abundance, composition and fate of phytoplankton in the Indian sector of the Southern Ocean, during the late austral summer of 1994 (ANTARES 2 cruise). In the study area (49 degrees S-67 degrees S, 62 degrees E), four different sub-systems are presented from south to north: the Coastal and Continental Shelf Zone (CCSZ), the Seasonal Ice Zone (SIZ), includ...

Temporal variabilities in benthic activity and biomass on the western European continental margin

Soltwedel, T (1997)
Temporal variations in activity and biomass of the smaller benthic biota (size range: bacteria up to small meiofaunal organisms) were investigated on the Goban Spur continental margin (NE Atlantic) within the framework of the multidisciplinary research programme OMEX (''Ocean Margin Exchange'') sponsored by the European Union. Activities and biomasses were estimated analysing a series of biogenic sediment compounds (enzymes, adenylates, DNA, phospho-lipids, particulate proteins). In contrast ...

Quantum state manipulation of trapped atomic ions

Wineland, D. J.; Monroe, C.; Meekhof, D. M.; King, B. E.; Leibfried, D.; Itano, W. M.; Bergquist, J. C.; Berkeland, D.; Bollinger, J. J.; Miller, J. (1997)
A single laser-cooled and trapped 9Be+ ion is used to investigate methods of coherent quantum-state synthesis and quantum logic. We create and characterize nonclassical states of motion including "Schroedinger-cat" states. A fundamental quantum logic gate is realized which uses two states of the quantized ion motion and two ion internal states as qubits. We explore some of the applications for, and problems in realizing, quantum computation based on multiple trapped ions.

Clubs

(1997)

Art of the Fugue

Chaloupka, V (1997)