High double excitation of two-electron atoms has been investigated using hyperpherical coordinates within a modified adiabatic expansion technique. This modification creates a novel fictitious force leading to a spontaneous exchange symmetry breaking at high double excitation. The Pauli principle must therefore be regarded as approximation valid only at low excitation energy. Threshold electron...

ahmad matar – iraqi satirical poet – attempted to save the arabic governments from imperialistic yoke who tried to arrogate nations’ freedom. his poetic language has sensible characteristics which the poet applies them in order to invite people to freedom and liberty. norm breaking is one of his poetry’s features. the present article tries to survey the vocal norm breaking – including rhyme, rh...

Abstract Complementing previous theoretical and experimental work, we explore new types of short-range modifications to Newtonian gravity arising from spacetime-symmetry breaking. The first non-perturbative, i.e. all orders in coefficients for Lorentz-symmetry breaking, are constructed the limit. We make use generic symmetry-breaking terms modifying sector examine isotropic coefficient results ...

We compute the critical coupling constant for the dynamical chiralsymmetry breaking in a model of quantum chromodynamics, solving numerically the quark self-energy using infrared finite gluon propagators found as solutions of the Schwinger-Dyson equation for the gluon, and one gluon propagator determined in numerical lattice simulations. The gluon mass scale screens the force responsible for th...

This study was conducted to investigate the hair production and fleece characteristics of hair goats in Fars province. The material of the study included a total data of 84 hair goats, which were between kids and adult in male and female goats, respectively. The overall average for fleece weight, fiber length, staple lengths, washing yield, hair fiber diameter, of fiber diameter, breaking force...

crust breaking of saffron is an important operation at the first stage of growth that should be accuratly operated as in this period sprouts of saffron rise up to near the soil surface. after primary irrigation, farmers soften the soil surface by means of different cultivation implements, which enables saffron flowers arise from subsurfarce. this research was conducted to compare tillage implem...