The direct radiative effect of absorbing aerosols consists of absorption-induced atmospheric heating together with scatteringand absorption-induced surface cooling. It is thus important to understand whether some of the reported climate impacts of anthropogenic absorbing aerosols are mainly due to the coexistence of these two opposite effects and to what extent the nonlinearity raised from such...

Combined systems for power production and thermally activated cooling have a high potential improving the efficiency utilisation of thermal systems. In this regard, various configurations been proposed are comprehensively reviewed. They primarily based on absorption implementation multiple levels complexity flexibility. The configuration combined cycle herein has wide commercial applicability o...

A novel method of ground-state laser cooling of trapped atoms utilizes the absorption profile of a three(or multi-) level system that is tailored by a quantum interference. With cooling rates comparable to conventional sideband cooling, lower final temperatures may be achieved. The method was experimentally implemented to cool a single Ca+ ion to its vibrational ground state. Since a broad band...

An updraft tower cooling system is assessed for elimination of water use associated with power plant heat rejection. Heat rejected from the power plant condenser is used to warm the air at the base of an updraft tower; buoyancy-driven air flows through a recuperative turbine inside the tower. The secondary loop, which couples the power plant condenser to a heat exchanger at the tower base, can ...

A high T, d.c. SQUID based magnetometer for magnetocardiography is currently under development at the University of Twente. Since such a magnetometer should be simple to use, the cooling of the system can be realized most practically by means of a cryocooler. A closed-cycle gas flow cooling system incorporating such a cooler has been designed, constructed and tested. The aimed resolution of the...

Electricity production in Lebanon stands at around 1.5 GW while the demand exceeds 2.5 GW at peak times and peak cooling demands, resulting in rationing cuts from between 3 to 20 hours a day which is the worst performance in the Middle East. Due to the country energy shortfall, a large number of small-scale backup generators is installed to address the electric and cooling needs. The proliferat...

To generate electricity, Gas Turbine Power Plants are extensively used around the world but their efficiency is negatively affected on hot days by ambient air temperatures. and output power will decrease 2% 12.5% respectively at temperature 40°C due to lower density resulting increase in compressor specific work. 
 Ordinarily, cooling down intake of gas turbine facilitated employing a vari...