Potassium dichromate (K2Cr2O7) is one of the most toxic elements to which man can be exposed at work or in the environment. The purpose of the current work is to compare the effect of K2Cr2O7 using variations in the dose, route of administration and duration of exposure in male and female Wistar albino rats with a special focus on biochemical parameters. K2Cr2O7 was subcutaneously administered alone (10, 50 and 100 mg/kg body weight) to female Wistar albino rats. Male rats received in their drinking water K2Cr2O7 30 mg/L/day) for 20 consecutive days. The Biochemical parameters were evaluated on days 3, 6 and 21 after subcutaneous (sc.) treatment in female rats and on days 10 and 20 after oral administration in male rats. The subcutaneous (s.c.) administration of 25 mg/kg of K2Cr2O7 to Wistar albino rats induced a slight change in plasma glucose levels during the experiment period. On the contrary, a significant decrease in plasma glucose levels was observed with 50 mg/kg mainly on days 3 (-26%) and 21 (-48%) after treatment compared to controls females rats. On the other hand, the higher dose provoked a significant increase in plasma glucose concentrations on days 6 (+31%) and 21 (+60%). similarly, the lower dose of chromium had no effect on the plasma urea levels. Conversely, a significant increase (122%) in this parameter was obtained during the first three days after treatment. In addition, a significant decrease in plasma glucose levels was observed with 50 mg/kg mainly on days 3 (-26%) and 21 (-48%) after treatment. On the other hand, the higher dose provoked a significant increase in plasma glucose concentrations on days 6 (+31%) and 21 (+60%). similarly, the lower dose of chromium had no effect on the plasma urea levels. Conversely, a significant increase in this parameter (122%) was obtained during the first three days after treatment. In addition, administration of 100 mg/kg of K2Cr2O7 by s.c markedly augmented the levels of plasma urea on days 3 (62%) and 6 (121%). Administration of 30 mg/L/day of K2Cr2O7 in the drinking water induced a significant augmentation in both of plasma glucose (27%) and urea (126%) during the first ten days of treatment. These results suggested that K2Cr2O7 administered subcutaneously or in the drinking water may induce harmful effects on biochemical parameters. Keywords : glucose, potassium dichromate, Wistar albino rat, urea.

This paper presents a full-wave method to calculate the resonant characteristics of rectangular microstrip antenna with and without dielectric cover, to explain the difference of performance with temperature between superconducting and normal conducting antenna. Especially the characteristics of high temperature superconducting (HTS) antenna were almost ideal around the critical temperature (Tc). The dyadic Green’s functions of the considered structure are efficiently determined in the vector Fourier transform domain. The effect of the superconductivity of the patch is taken into account using the concept of the complex resistive boundary condition. The computed results are found to be in good agreement with results obtained using other methods. Also, the effects of the superstrate on the resonant frequency and bandwidth of rectangular microstrip patch in a substrate–superstrate configuration are investigated. This type of configuration can be used for wider bandwidth by proper selection of superstrate thickness and its dielectric constants.

This paper presents a full-wave method to calculate the resonant characteristics of rectangular microstrip antenna with and without dielectric cover, to explain the difference of performance with temperature between superconducting and normal conducting antenna. Especially the characteristics of high temperature superconducting (HTS) antenna were almost ideal around the critical temperature (Tc). The dyadic Green’s functions of the considered structure are efficiently determined in the vector Fourier transform domain. The effect of the superconductivity of the patch is taken into account using the concept of the complex resistive boundary condition. The computed results are found to be in good agreement with results obtained using other methods. Also, the effects of the superstrate on the resonant frequency and bandwidth of rectangular microstrip patch in a substrate–superstrate configuration are investigated. This type of configuration can be used for wider bandwidth by proper selection of superstrate thickness and its dielectric constants.

  The numerical homogenization technique is used in order to compute the effective elastic properties of heterogeneous random 2-phase composites.Differents microstructures are considered with different volume fraction.microstructure with random distribution of identical non-overlapping phases inclusions based on the Poisson process.(PBC), boundary conditions are applied on the representati ve volume element, RVE, of microstructures, for elastic modeling by finite element method. The aim of the work was to examine how spatial distribution and particles volume fraction influences the elastic  propertiesof the composite material. The results were compared to various analytical model

  The numerical homogenization technique is used in order to compute the effective elastic properties of heterogeneous random 2-phase composites.Differents microstructures are considered with different volume fraction.microstructure with random distribution of identical non-overlapping phases inclusions based on the Poisson process.(PBC), boundary conditions are applied on the representati ve volume element, RVE, of microstructures, for elastic modeling by finite element method. The aim of the work was to examine how spatial distribution and particles volume fraction influences the elastic  propertiesof the composite material. The results were compared to various analytical model

  The numerical homogenization technique is used in order to compute the effective elastic properties of heterogeneous random 2-phase composites.Differents microstructures are considered with different volume fraction.microstructure with random distribution of identical non-overlapping phases inclusions based on the Poisson process.(PBC), boundary conditions are applied on the representati ve volume element, RVE, of microstructures, for elastic modeling by finite element method. The aim of the work was to examine how spatial distribution and particles volume fraction influences the elastic  propertiesof the composite material. The results were compared to various analytical model

  The numerical homogenization technique is used in order to compute the effective elastic properties of heterogeneous random 2-phase composites.Differents microstructures are considered with different volume fraction.microstructure with random distribution of identical non-overlapping phases inclusions based on the Poisson process.(PBC), boundary conditions are applied on the representati ve volume element, RVE, of microstructures, for elastic modeling by finite element method. The aim of the work was to examine how spatial distribution and particles volume fraction influences the elastic  propertiesof the composite material. The results were compared to various analytical model

The paper proposes a new reliable fault-tolerant scheduling algorithm for real-time embedded systems. The proposed algorithm is based on static scheduling that allows to include the dependencies and the execution cost of tasks and data dependencies in its scheduling decisions. Our scheduling algorithm is dedicated to multi-bus heterogeneous architectures with multiple processors linked by several shared buses. This scheduling algorithm is considering only one bus fault caused by hardware faults and compensated by software redundancy solutions. The proposed algorithm is based on both active and passive backup copies to minimize the scheduling length of data on buses. In the experiments, the proposed methods are evaluated in terms of data scheduling length for a set of DSP benchmarks. The experimental results show the effectiveness of our technique.