This paper is aimed at calculating corona current-voltage characteristics of a new design of an electrostatic motor with a cylindrical rotor made from aluminium foil and multi stator copper electrodes. The stator electrodes are alternately stressed positively and negatively. The corona currents emitted from positively and negatively-stressed electrodes are calculated being dependent on the applied voltage and motor geometry. The method of calculation is based on simultaneous solution of Poisson’s equation, current density equation and continuity equation for current density. This calls at first for calculation of the spatial distribution of electric field within the motor volume using the accurate charge simulation technique. The calculated current-voltage characteristics of the motor agreed reasonably with those measured experimentally for three motors built-in the laboratory.

This paper is aimed at calculating corona current-voltage characteristics of a new design of an electrostatic motor with a cylindrical rotor made from aluminium foil and multi stator copper electrodes. The stator electrodes are alternately stressed positively and negatively. The corona currents emitted from positively and negatively-stressed electrodes are calculated being dependent on the applied voltage and motor geometry. The method of calculation is based on simultaneous solution of Poisson’s equation, current density equation and continuity equation for current density. This calls at first for calculation of the spatial distribution of electric field within the motor volume using the accurate charge simulation technique. The calculated current-voltage characteristics of the motor agreed reasonably with those measured experimentally for three motors built-in the laboratory.

closed bus routes. Transit passengers, in many cases, deal with overlapping bus routes with some routes sharing common sections and stops. Passenger assignment problem is a major task in frequency setting of bus service which aims to minimize passengers and operator costs. In this work, mixed integer mathematical formulation based on passenger choice problem is developed to track each proportion of passengers’ in selecting bus routes for -0- and -1- trips transfer. The proposed model would help for a given transit network and total bus fleet size to minimize network total travel time. It would optimally distribute frequency among bus routes, regarding passengers’ interests in selecting bus routes. It differs from traditional models, since it helps in tracking different users while they are moving on the network. Numerical examples are given to clarify the proposed mathematical formulation. Circular bus routes operational performance is tested using Mandl’s network benchmark problem. Genetic Algorithm has been implemented with Matlab language in solution procedure. Comparing results with previous work indicates that circular bus routes manage in minimizing average user travel time for the same operator cost. The results from this study would help in further work to optimize transit vehicle size and stops distances along each single bus route.

closed bus routes. Transit passengers, in many cases, deal with overlapping bus routes with some routes sharing common sections and stops. Passenger assignment problem is a major task in frequency setting of bus service which aims to minimize passengers and operator costs. In this work, mixed integer mathematical formulation based on passenger choice problem is developed to track each proportion of passengers’ in selecting bus routes for -0- and -1- trips transfer. The proposed model would help for a given transit network and total bus fleet size to minimize network total travel time. It would optimally distribute frequency among bus routes, regarding passengers’ interests in selecting bus routes. It differs from traditional models, since it helps in tracking different users while they are moving on the network. Numerical examples are given to clarify the proposed mathematical formulation. Circular bus routes operational performance is tested using Mandl’s network benchmark problem. Genetic Algorithm has been implemented with Matlab language in solution procedure. Comparing results with previous work indicates that circular bus routes manage in minimizing average user travel time for the same operator cost. The results from this study would help in further work to optimize transit vehicle size and stops distances along each single bus route.

closed bus routes. Transit passengers, in many cases, deal with overlapping bus routes with some routes sharing common sections and stops. Passenger assignment problem is a major task in frequency setting of bus service which aims to minimize passengers and operator costs. In this work, mixed integer mathematical formulation based on passenger choice problem is developed to track each proportion of passengers’ in selecting bus routes for -0- and -1- trips transfer. The proposed model would help for a given transit network and total bus fleet size to minimize network total travel time. It would optimally distribute frequency among bus routes, regarding passengers’ interests in selecting bus routes. It differs from traditional models, since it helps in tracking different users while they are moving on the network. Numerical examples are given to clarify the proposed mathematical formulation. Circular bus routes operational performance is tested using Mandl’s network benchmark problem. Genetic Algorithm has been implemented with Matlab language in solution procedure. Comparing results with previous work indicates that circular bus routes manage in minimizing average user travel time for the same operator cost. The results from this study would help in further work to optimize transit vehicle size and stops distances along each single bus route.

Expansive soil is found in many regions in Egypt, especially in the new desert cities including New Sohag City(town in upper Egypt). In this study, The soil samples were taken from the place of the Faculty of Veterinary Medicine at New Sohag University from a depth of 5 meters and it’s used in the experimental program. The physical and mechanical properties of the natural soil were obtained. Then the soil was treated with chemical additives (Addicrete P and Addicrete BV) 0.5%, 1% and 2% by dry weight of soil. After treatment of soil the properties of the samples were investigated. The natural soil properties were used as control points for comparison purposes. The main results show that with increase of Addicrete P the plastic limit increases and liquid limit decreases, hence decreases plasticity index and it is revealed that a change of expansive soil texture takes place when Addicrete P are mixed with expansive soil. While Addicrete BV does not effect on the Atterberg limits or the soil texture of the soil. As the amount of “Addicrete P and Addicrete BV” is increased, there are an apparent reduction in optimum moisture content ,unconfined compressive strength, free swell, swelling potential and swelling pressure, and a corresponding increase in maximum dry density. The paper contains many important test results and these results were analyzed to establish optimum dosage levels for each of the treated additives. Based on the results obtained, it can be concluded that the expansive soil can be successfully improved by Addicrete P and Addicrete BV.

Expansive soil is found in many regions in Egypt, especially in the new desert cities including New Sohag City(town in upper Egypt). In this study, The soil samples were taken from the place of the Faculty of Veterinary Medicine at New Sohag University from a depth of 5 meters and it’s used in the experimental program. The physical and mechanical properties of the natural soil were obtained. Then the soil was treated with chemical additives (Addicrete P and Addicrete BV) 0.5%, 1% and 2% by dry weight of soil. After treatment of soil the properties of the samples were investigated. The natural soil properties were used as control points for comparison purposes. The main results show that with increase of Addicrete P the plastic limit increases and liquid limit decreases, hence decreases plasticity index and it is revealed that a change of expansive soil texture takes place when Addicrete P are mixed with expansive soil. While Addicrete BV does not effect on the Atterberg limits or the soil texture of the soil. As the amount of “Addicrete P and Addicrete BV” is increased, there are an apparent reduction in optimum moisture content ,unconfined compressive strength, free swell, swelling potential and swelling pressure, and a corresponding increase in maximum dry density. The paper contains many important test results and these results were analyzed to establish optimum dosage levels for each of the treated additives. Based on the results obtained, it can be concluded that the expansive soil can be successfully improved by Addicrete P and Addicrete BV.

he main aim of the present study is to present a comparison between the static shear behavior of high strength concrete beams and normal strength concrete beams. The concrete compressive strength of the beams ranged from 250 to 700 kg/ . Sixty reinforced concrete beams were analyzed under two point static loads. The variables were the compressive strength of concrete, shear span-to-depth ratio and shear reinforcement ratio (stirrup spacing S). The effect of each variable on the behavior of the beams is studied separately. The details of the beam specimens, material properties, and instrumentation are described in this paper. The results are presented and discussed and the influence of each design parameter is investigated. Analysis of the results is also compared with different existing approaches.

he main aim of the present study is to present a comparison between the static shear behavior of high strength concrete beams and normal strength concrete beams. The concrete compressive strength of the beams ranged from 250 to 700 kg/ . Sixty reinforced concrete beams were analyzed under two point static loads. The variables were the compressive strength of concrete, shear span-to-depth ratio and shear reinforcement ratio (stirrup spacing S). The effect of each variable on the behavior of the beams is studied separately. The details of the beam specimens, material properties, and instrumentation are described in this paper. The results are presented and discussed and the influence of each design parameter is investigated. Analysis of the results is also compared with different existing approaches.

This research presents an investigation through a numerical study on the effect of two parameters; stiffness of columns and number of stories on both base shear force and top displacement of buildings. In this study, two dimensional models were used with varying number of stories (6, 12, 20 and 30) and varying column cross sections. The results proved that these two parameters have significant impact on both base shear and top displacements. Results show a difference between actual seismic behavior and the resulted seismic behavior from traditional code method, which reflects on economic designs of such structures.