نتایج جستجو برای: effective atomic number and electron density
تعداد نتایج: 17027639 فیلتر نتایج به سال:
Atomic partial charges appear in the Coulomb term of many force-field models and can be derived from electronic structure calculations with a myriad of atoms-in-molecules (AIM) methods. More advanced models have also been proposed, using the distributed nature of the electron cloud and atomic multipoles. In this work, an electrostatic force field is defined through a concise approximation of th...
abstract biometric access control is an automatic system that intelligently provides the access of special actions to predefined individuals. it may use one or more unique features of humans, like fingerprint, iris, gesture, 2d and 3d face images. 2d face image is one of the important features with useful and reliable information for recognition of individuals and systems based on this ...
the community dynamics of aquatic coleoptera(insecta)in one of the spring-stream habitats of bammo national park in fars province called cheshmeh-ye-ghanbari is studied as a pilot project and model for acquaintance with and furthering the biodiversity studies on fauna of iran. sixteen species-populations out of nineteen of this community were already identified for their taxonomy and for thei...
the present thesis is going to investigate the theme of despair, darkness and pesimism in philip larkins poetry. larkin is a british poet whose poems were composed in the dark and gloomy years of postwar. so, his poetry contains and reflects the same darkness and despair of his age. a good number of poems form different collections of his poetry are chosen and will be analyzed in the light of t...
The aim of this study is to calculate the experimental and theoretical mass attenuation coefficient some Br compounds by using transmission method. Also these values were determined total electronic section, atomic effective number, electron density Kerma. We performed calculations in direct excitation geometry. cross sections halogene measured a narrow beam good geometry high resolution Si(Li)...
An analytical relationship between the densities of the Shannon entropy and Fisher information for atomic and molecular systems has been established in this work. Two equivalent forms of the Fisher information density are introduced as well. It is found that for electron densities of atoms and molecules the Shannon entropy density is intrinsically related to the electron density and the two for...
In this paper, the nucleation and growth of diamond/diamond-like coatings on austenitic (AISI 316) and ferritic (AISI 430) stainless steel substrates have been investigated using torch technique. The effects of substrate surface preparation has also been studied. The quality of coatings produced has been examined using optical and scanning electron microscopy, X-ray diffraction, Raman spectros...
Measurements of radiation near the 670.8 nm atomic spectral line of Lithium as a 30 GeV electron beam propagates through a long, high density heat pipe oven (∼ 1 meter, neutral density ∼ 1015cm−3) have been performed. Practical considerations in the use of Cerenkov radiation as an automatically synchronized diagnostic of the plasma source properties are investigated. Parametric scans of the Cer...
A local hydrogen-like upper bound for the spherically averaged electron momentum density is studied within the Hartree–Fock framework for 103 neutral atoms, 54 singly charged atomic cations and 43 anions in their ground state. The maximum value of the electron momentum density is bounded analytically by means of some global properties of the system.
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