Abstract We propose a simple model for distributed query processing based on the concept of array . Such an has fields some data type whose values can be stored different machines. It offers operations to manipulate all in parallel within algebra The arrays considered are one-dimensional and just serve partitioned set. Distributed rest given set types called basic implemented by piece software ...

this paper presents a control strategy for fuel cell/energy storage power generation system during voltage sag conditions. the hybrid dc power sources are connected to grid using power electronic converters include dc-dc converter and grid connected voltage source inverter. the power from hybrid power sources is controlled during voltage sag by designing of control strategy for dc-dc converter....

today, due to qualitative growth and scientific advances, energy, especially electricity is increasingly needed by human society. one of the almost endless and pure energy which have been paid attention over the years is the solar energy. solar cells directly convert solar energy into electrical energy and are one of the main blocks of photovoltaic systems. significant improvement has been made...