Previously polyethylene had to be made by a process requiring pressures of about 1,000 atmospheres, and polypropylene of useful properties was not commercially important.
The DRA polymer is much more difficult to dissolve in ethane, however, requiring pressures of more than 20 MPa.
The suits said the fraternity had a long tradition of "requiring, pressuring, encouraging and forcing" pledge members to jump off bridges over the lake and swim to shore.
Convex and hydrofoil shape designs showed significant reduction in the required pumping power as well as the maximum required pressure.
More restrictive heat exchangers often require pressure rises unattainable with conventional axial-flow fans.
In fact, to succeed, innovation usually requires pressure, necessity, and even adversity: the fear of loss often proves more powerful than the hope of gain.
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.
Why is this? A. To prevent the computer's accidentally shutting down if the power button is bumped, some machines have a power button that requires pressure for a longer period of time than just a quick tap.
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.
Complete elimination of arterial bleeding requires pressure that exceeds the systemic blood pressure.
