As long as eq. (4) is satisfied we can then perform a gauge transformation to set to 0 some components of h̄μν . Note that this would not be possible if Tμν 6= 0 (it would appear on the right hand side of eq. (1)), as ξ and h̄μν would then satisfy different equations. Let us thus choose a specific ξ to impose 4 conditions on h̄μν . In particular h̄→ h̄′ = h̄+ ξ ,μ μ so one can choose ξ0, say, to set ...

Some of the difficulties and misunderstandings that happen in accounting theory, practice, regulation and education are grounded in language and linguistics. As an illustration of this the Persian equivalent of 'accounting' is linguistically analysed to reveal how a mistranslation may cause difficulties in understanding and improving Iranian Accounting. This paper shows how Hesaabdaaree is not ...

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We prove that if T = T eq is a stable theory (without the finite cover property), then the theory TP of “beautiful pairs” eliminates imaginaries if and only if no infinite group is definable in a model of T .

An efficient, simple and convenient route is described for the synthesis of biscoumarin (3,3'-(arylmethylene) bis (4-hydroxy-2H-chromen-2-one)) by using of recyclable catalyst TiO2@KSF. In this Method, we synthesis biscoumarin derivatives via 3multi-component reactions (3MCRs) of two equivalent 4-hydroxycoumarin with one equivalent of aromatic aldehydes using 20 mg nano TiO2@KSF as homogeneous ...

Background: The activity concentrations of natural radionuclides in soil around a coal-fired thermal power plant of northwest China were investigated for assessing the radioactivity level. Materials and Methods: Soil samples were collected around the coal-fired thermal power plant and their radioactivity levels were determined using gamma ray spectrometry. Radiation hazards were assessed by rad...

Photon ambient dose equivalent buildup factors were calculated for point and plaque isotropic cobalt-60 and cesium-137 radioactive sources irradiating a finite slab shield materials of ordinary concrete, barite concrete, lead, lead glass and water using MCNP5 code. Studied shield thickness ranged from 1 to 15 mean free paths (mfp). A variance reduction technique available in the code was used t...

AbstructThe equivalent circuit and the scattering parameters of the orthogonal microstrip crossover discontinuity are determined by assuming that the conducting strips are embedded in a multilayered substrate which may contain both anisotropic dielectrics and materials with a nonnegligible conductivity. The equivalent circuit of the crossover is obtained in terms of the complex excess charge de...