We study complex eigenvalues of the Wishart model for nonsymmetric correlation matrices. The model is defined for two statistically equivalent but different Gaussian real matrices, as C = AB/T , where B is the transpose of B and both matrices A and B are of dimensions N × T . If A and B are uncorrelated, or equivalently if C vanishes on average, it is known that at large matrix dimension the do...

We compare the statistical properties of structures normal and transverse to the line of sight which appear in theoretical N-body simulations of structure formation, and seem also to be present in observational data from redshift surveys. We present a statistic which can quantify this effect in a conceptually different way from standard analyses of distortions of the power-spectrum or correlati...

We compare the statistical properties of structures normal and transverse to the line of sight which appear in theoretical N-body simulations of structure formation, and seem also to be present in observational data from redshift surveys. We present a statistic which can quantify this effect in a conceptually different way from standard analyses of distortions of the power-spectrum or correlati...

We calculate the spectral function A ρ of the ρ meson in nuclear matter. The calculation is performed in the low density approximation , where the in-medium self energy Σ med is completely determined by the vacuum ρ N forward scattering amplitude. This amplitude is derived from a relativistic resonance model. In comparison to previous non-relativistic calculations we find a much weaker momentum...

We calculate the spin density matrix of the hadron h created via quark fragmentation in the process e − e + → q ¯ q → h + X. In the case of h = Λ the experimental data could possibly elucidate the problem of s-quark contribution to the spin of the Λ-hyperon, to be compared with the case of the proton (" spin crisis "). Generally we find that for hadrons with spin 1/2 the parton description, usi...

We calculate the spectral function A ρ of the ρ meson in nuclear matter. The calculation is performed in the low density approximation , where the in-medium self energy Σ med is completely determined by the vacuum ρ N forward scattering amplitude. This amplitude is derived from a relativistic resonance model. In comparison to previous non-relativistic calculations we find a much weaker momentum...

We study theoretically the spin response functions using the relativistic many body theory. The spin response functions in the relativistic theory are reduced largely from the ones of the non-relativistic theory. This happens particularly to the longitudinal spin responses. This fact is able to remove the difficulty in reproducing the ratio of the longitudinal and transverse response functions ...

Suppose we want to estimate a density at a point where we know the values of its first or higher order derivatives. In this case a given kernel estimator of the density can be modified by adding appropriately weighted kernel estimators of these derivatives. We give conditions under which the modified estimators are asymptotically normal. We also determine the optimal weights. When the highest d...

A general procedure is presented for computing the gas phase heats of formation of a wide variety of organic compounds. AE for the formation of the molecule from its elements at 0°K is obtained from density functional calculations (Gaussian 92/DFT) for optimized geometries. This result is converted to AH at 298*K by assuming ideal behavior and adding the translational, rotational and vibrationa...

at first, in order to define acute toxicity of diazinon insecticide and butachlor herbicide, acute toxicity tests (lc5096h) were done, based on standard method (1989) o.e.c.d. in static way and for 96 hours. and the amount of acute toxicity (lc5096h) of diazinon and butachlor in 1 to 2 gram vimba vimba persa fry larva was determined to be 0.09 and 0.61 respectively. in order to do histology stu...