Recently Debates about Energy and the issue of global warming have led to the use of new energy. One of the best options for this purpose is the use of a new hybrid system of power, heating and refrigeration, with its thermal source of solar and geothermal energy. In the present study, used a combined cooling, heating and power system based on the organic Rankine cycle and the Ejector Refrigera...

The overall thermal performance of a Parabolic Trough Collector (PTC) depends on its optical performance, particularly the uniformity of the irradiance distribution and the resultant optical efficiency of the collector. Local Concentration Ratio (LCR), optical efficiency and average light concentration are three fundamental parameters of the optical performance of a PTC. These parameters are af...

This paper presents several microwave power ampl~ier designs that promise high power and broad bandwidth, while meeting the eficiency and linearity requirements of advanced radar and communication systems. Power amplifiers are designed based on an ultra-high f~u~ (>450 GHz) selective buried sub-collector (SBSC) HBT technology [1]. SBSC HBTs are fabricated on prepatterned sub-collector mesas. Th...

In a context of energy abundance for industrial applications, systems are exploited with minimal attention to their actual consumption requirements meet the loads imposed on them. As result, most them used at maximal capacity, regardless varying operational conditions. First, paper studies pneumatic conveying and thoroughly reviews previously published work. Then, we overview simulations operat...

At the Royal Botanic Garden Edinburgh (RBGE) the use of Optical Character Recognition (OCR) to aid the digitisation process has been investigated. This was tested using a herbarium specimen digitisation process with two stages of data entry. Records were initially batch-processed to add data extracted from the OCR text prior to being sorted based on Collector and/or Country. Using images of the...

Submitted: May 2, 2013; Accepted: Jun 13, 2013; Published: Jul 28, 2013 Abstract: Despite the recent interest of Saudi Arabia in the solar energy as a renewable source of energy, no effort yet has been directed towards the Parabolic Trough Concentrator (PTC) technology which considers being one of the cheapest and most effective technologies for solar power. In the present paper, the performanc...