this paper presents the results of a study on the radiation characteristics of a plasma triangular antenna in the vhf band (30-300mhz) applying the method of moment. deriving the current distribution of the antenna, it shows the relationship between radiation characteristics of the plasma antenna and the plasma parameters. both theoretical and numerical results indicate that if the plasma frequ...

To ensure safety during coal mining, the DC electric method is frequently used for advanced detection of concealed water-rich abnormal geological bodies located ahead a drivage roadway. However, to some extent, accuracy influenced by roadway cavity, resulting in deviation from actual location anomaly. investigate this phenomenon, principle based on spheroidal physical model was analyzed via “co...

The spark advance determines the efficiency of spark-ignited (SI) engines by positioning the combustion in relation to the piston motion. Today’s spark-advance controllers are open-loop systems that measure parameters that effect the sparkadvance setting and compensate for their effects. Several parameters influence the best spark-advance setting but it would be too expensive to measure and acc...

in this research, the steady-state flow filed around a 3d body and rotor configuration of the robin helicopter is simulated. the rotor is modeled by an actuator disk. for this purpose, an annular computational domain replaces the rotor and some modeled source terms are added to the momentum equations. this modeling of rotor considerably speed up computational time. the flow field over this heli...

by approval of building advance-sale act in 2010, it is permitted to sell in advance the buildings to be built in future. in this act, certain rights and obligations are provided for the advance-sellers and advance-buyers. the approval of the said act is a development in the law of sale of buildings. amongst them are the requirement for official registration of any building advance-sale, statut...

As a potential method for improving the resource utility, advance reservations is crucial for brokering computational resource in a predictable and efficient way. However, Conducting Advance Reservation efficiently in grid environment is not easy due to the insufficient support of the current grid architecture and the dynamic feature of grid resources. Based on a grid middleware Migol, this pap...