469 research outputs found
Corrections to Hadronic and Electromagnetic Decays of Heavy Quarkonium
We study corrections to decays of heavy quarkonium
into light hadrons and two photons within the framework of nonrelativistic QCD,
and find these corrections to have significant contributions
especially for the decay into light hadrons. With these new results,
experimental measurements of the hadronic width and the width of
can be described more consistently. By fitting experimental data, we
find the long-distance matrix elements of to be
and . Moreover, is also
discussed and the decay width is predicted to be
.Comment: Version published in PRD, 22 pages, 7 figures, references adde
Effect of low intensity white light irradiation on the retinas of mice
AIM: To investigate the effect of low intensity white light irradiation on the retinas of mice.<p>METHODS: Thirty C57BL/6J mice were randomly divided into two groups. The number of the mice in each group was 15. The mice in experimental group received dark adaptation from 5:00p.m. to 6:00p.m.,and then exposed to LED white light from 6:00p.m. to 7:00p.m. everyday for a month. At 1, 3, 7, 14 and 30d after the beginning, we examed the histology of mice retinas, calculated the thickness of outer nuclear layer(ONL),inner nuclear layer(INL)and analyzed electrophysiology of mice.<p>RESULTS:One month after experiment, compared to the control group, the latency of Rod-R a wave of the mice in experimental group significantly prolonged, the amplitude of Cone-R b wave of the mice in experimental group significantly decreased and the latency of b wave of the mice in experimental group significantly prolonged(<i>P</i><0.05).There are no significant difference in the histology of retina, ONL and INL thicknesses.<p>CONCLUSION: 100lux low intensity white light could give rise to the impairment of the retinal functions in dark-adapted mice
A Multi-Agent-Based System for eProcurement
E-procurement has become an important function of enterprise information systems. The process of e-procurement includes automatic definition of product requirements, search and selection for suppliers, negotiation and contracting with suppliers. In this paper, we propose a novel agentbased architecture for e-procurement system, in which various agents take such responsibilities as negotiating and contracting. Moreover, the architecture that we propose can monitor transaction status and enhance the flexibility to handle unexpected exceptions, thus leading to agile procurement management
Poly[diaquaÂtris(μ4-isophthalato)dilanthanum(III)]
In the title coordination polymer, [La2(C8H4O4)3(H2O)2]n, there are two independent LaIII atoms which are coordinated differently in slightly distorted pentaÂgonal-bipyramidal and slightly disorted bicapped trigonal-prismatic environments. The LaIII ions are bridged by μ4-isophthalate ligands, forming two-dimensional layers. In the crystal structure, these layers are connected by interÂmolecular O—H⋯O hydrogen bonds into a three-dimensional network
(2,2′-Bipyridine-κ2 N,N′)iodido(pyrrolÂidine-1-dithioÂcarboxylÂato-κ2 S,S′)copper(II)
In the title compound, [Cu(C5H8NS2)I(C10H8N2)], the CuII ion is coordinated by one iodide ion, two N atoms of the bipyridine ligand and two S atoms from the pyrrolidine-1-dithioÂcarboxylÂate ligand in a distorted square-pyramidal environment
- …