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284 research data, page 1 of 29

W pair production cross-section and W branching fractions in e+ e- interactions at 189-GeV

CERN-LEP. Measurement of the W+ W- pair production cross sections in E+ E- interactions at c.m. energy of 189 GeV. The data have an integrated luminosity of 155 pb-1. Cross sections are presented for the all hadron, semileptonic and fully leptonic final states as well as the total.

The Low-Lying Excited States of Pyridine

Cai, Zheng-Li; Reimers, Jeffrey R. (2000)
Publisher: Figshare
We assign the observed phosphorescence and high-resolution singlet-to-triplet absorption spectra of pyridine, performing large model vibronic coupling calculations involving six active modes and three near-degenerate electronic states, 3A1, (2)3A1, and 3B1. Vibronic coupling primarily through ν8a between 3A1 and (2)3A1 results in the breakdown of the pseudo-parity selection rule:  the lower surface has a double minimum, with each well corresponding to a diabatic single-determinant...

Inclusive photoproduction of neutral pions in the photon hemisphere at HERA

DESY-HERA. Measurement of the inclusive cross section for photoproduction of PI0s as a function of PT, rapidity and Feyman X. The data have an average photon-proton centre of mass energy of 208 GeV and photon virtuality below Q**2 = 0.01 GeV**2. Two data samples were used in the analysis. 1) The & apos;minimum bias& apos; sample, collected in 1997 which has an integrated luminosity of 300 nb-1, and. 2) the & apos;SpaCal& apos; sample collected in 1997 which has an integrated luminosity of 4.3...

Chemistry of Metal-Bound Anion Radicals. A Family of Mono- and Bis(azopyridine) Chelates of Bivalent Ruthenium

The reaction of the dihydride [RuII(H)2(CO)(PPh3)3], 3, with excess azo-2,2‘-bipyridine (abp) in boiling dry benzene has afforded the diradical bischelate [RuII(abp•-)2(CO)(PPh3)], 4, and the hydridic monochelate monoradical [RuII(abp•-)(H)(CO)(PPh3)2], 5. A similar reaction between 3 and 2-(p-chlorophenylazo)pyridine (Clpap) did not yield a bischelate, but the hydridic monoradical [RuII(Clpap•-)(H)(CO)(PPh3)2], 6, has been isolated. Upon treatment of 4−6 with NH4PF6 in a wet dich...

Three-Dimensional Transmission Electron Microscopy:  A Novel Imaging and Characterization Technique with Nanometer Scale Resolution for Materials Science

Three-dimensional transmission electron microscopy (3D-TEM), effectuated by multiple imaging of a sample combined with image analysis, offers a new approach in materials science to obtain 3D information of complex solid materials. Here we report first-of-its-kind results that have been obtained with zeolite materials. Virtual cross-sections and volume rendering of the 3D reconstruction of a metal/zeolite crystal (Ag/NaY) give unequivocal information on the location of the silver p...

Search for CP violation in D0 and D+ decays

Fermilab-Tevatron. Search for violation in D0 and D+ decays.. Beam photons obtained by means of bremsstrahlung of electron and positron beams (with tipically 300 GeV endpoint energy), with a beryllium oxide target. More than 6.3*10**9 triggers were collected from which more than 1 millioncharmed particles have been reconstructed.

Model-based formfinding processes: free forms in structural and architectural design

Wendland, David (2000)
Publisher: Universität Stuttgart
Embargo end date: 2016/03/31
The problem of form generation and of the transmission of production instructions is discussed, introducing the concept of form process. Examples for instructions is discussed, introducing the concept of form process. Examples for architectural motivations are presented. In structural design, physical models have been used to determine the figure of equilibrium for structures resistant by form, such as tents, tensile structures or shell structures. For structural design as well as for archite...