More restrictive heat exchangers often require pressure rises unattainable with conventional axial-flow fans.
However, these lasers have not been exploited fully because these require pressure recovery systems for their operation and as such the practical systems are extremely voluminous and bulky.
Ironically, it may require pressure from low-income aid-recipient countries, rather than powerful western players, to persuade MICs to join Paris-style aid-effectiveness restrictions, but there is little sign of that pressure so far.
Massimo d'Alema, the Italian foreign minister, who will be hosting Wednesday's peace conference, said a deal would require pressure on Syria and Iran, both sponsors of Hizbullah, to achieve a suspension of violence.
This is the work of nations, but such goals require pressure from ordinary citizens if there is to be any hope of bringing them about in the face of opposing political and economic interests.
This work provided a simple route to the production of mats without high pressure processing or irradiation techniques generally used to produce Buckypaper which can require pressure control chambers, argon and hydrogen ion beams and high temperatures.
