نتایج جستجو برای: lattice energy
تعداد نتایج: 746770 فیلتر نتایج به سال:
ar X iv : h ep - p h / 97 11 45 1 v 1 2 4 N ov 1 99 7 A study of hybrid quarkonium using lattice QCD
The hybrid quarkonium states are studied using the Born-Oppenheimer expansion. The first step in this expansion is the determination of the energy levels of the gluons in the presence of a static quark-antiquark pair as a function of the quark-antiquark separation. The spectrum of such gluonic excitations is determined from first principles using lattice QCD.
A systematic search for optimal lattice rules of specified trigonometric degree d over the hypercube [0, 1)s has been undertaken. The search is restricted to a population K(s, δ) of lattice rules Q(Λ). This includes those where the dual lattice Λ⊥ may be generated by s points h for each of which |h| = δ = d+ 1. The underlying theory, which suggests that such a restriction might be helpful, is p...
The Iranian Light Source Facility (ILSF) as a national project is a 3 GeV third generation synchrotron light source facility which provides high energy super bright X-ray for the users. Design of the ILSF storage ring emphasizes an ultra low electron beam emittance (below than 5 nm.rad), beam current of 400 mA, great brightness, stability and reliability which make it competitive in the operati...
fabrication and characterization of visible light active fe-tio2 nanocomposites as nanophotocatalyst
in this research fe-tio2 nanocomposites with different molar ratios of fe/ti were prepared as nano-photocatalyst using a modified sol-gel process at ambient temperature. crystallographic properties of nanocomposites were characterized by x-ray diffraction (xrd). surface morphology and mean particle size of nanocomposites were specified by field emission scanning electron microscopy (fesem) and ...
Finite size effects on the calorimetric cooperatity of the folding-unfolding transition in two-state proteins are considered using the Go lattice models with and without side chains. We show that for models without side chains a dimensionless measure of calorimetric cooperativity κ2 defined as the ratio of the van’t Hoff to calorimetric enthalpy does not depend on the number of amino acids N . ...
We consider nite lattice packings C n + K of n copies of some centrally symmetric convex body K in E d for large n. Assume that C n is a subset of a lattice , and % is at least the covering radius; namely, + %K covers the space. The parametric density (C n ; %) is deened by (C n ; %) = n V (K)=V (conv C n + %K). We show that if (C n ; %) is minimal for n large then the shape of conv C n is appr...
SnO2 nanoparticles have been synthesized via sol-gel method in different annealing temperatures. TEM, FESEM and XRD techniques have been used to investigate the structure and morphology of SnO2 nanoparticles. The XRD pattern analysis shows all samples are single phase. XRD patterns show as the annealing temperature increases, the peaks become sharper which is related to the increase in the crys...
Mn doped ZnO nanocrystals were prepared by co-precipitation route sintered at 450 °C temperature. XRD results indicate that the samples having hexagonal (wurtzite) structure. From X-ray data it is found that the lattice parameters increase with increasing Mn concentration. The X-ray density decreases with increasing Mn concentration of Zn 1-x Mnx O nanocrystals. It indicates that the Mn...
With the H1 detector at the collider HERA, meson production cross sections have been measured in deep inelastic scattering with four-momentum transfers GeV and in photoproduction at energies around GeV and GeV. Next-to-Leading Order QCD calculations are found to describe the differential cross sections within theoretical and experimental uncertainties. Using these calculations, the NLO gluon mo...
First-principles calculations and phenomenological modeling of lattice misfit in Ni-base superalloys
′ An integrated computational approach is proposed for evaluating the lattice misfit between and in Ni-base superalloys by combining rst-principles calculations, existing experimental data and phenomenological modeling. In particular, the lattice misfits in Ni–Al and Ni–Al–Mo lloys were studied. This approach is validated by comparing the calculated lattice misfit with available experimental me...
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