Parametric pumping continuous

The adsorbent particles in pressure-swing parametric pumping are substantially smaller than those in PSA and produce rapidly fluctuating pressure profiles in the bed during a cycle. These profiles and the cycle times which influence them are responsible for the continuous product flow, the high productivities and the high product purities which can be attained in the process. 

Batch parametric pumping in a closed system was studied in the context of an equilibrium nondispersive model in Section 7.1.4.1. Continuous open parametric pumps have been modeled by a number of investigators (Gregory and Sweed, 1970 Chen and Hill, 1971). A number of experimental systems have been studied. These include pH based operations (Sabadell and Sweed, 1970 Chen et al, 1979, 1980) and pressure based gas separation operations (Keller and Kuo, 1982). 

A useful source of continuously tunable radiation from the near UV to the near-IR with unexplored potential in fluorescence studies is the optical parametric oscillator (OPO). These devices have been around since the 1960s(73) and have received a lot of coverage recently in laser and optoelectronic journals/74 This resurgence of interest in OPOs has been brought about by recent improvements in nonlinear crystals and the development of all-solid-state pump-laser sources with the required levels of coherence and intensity. 

The process of spontaneous parametric downconversion has been studied extensively [79,80] for cw (continuous-wave) pump lasers over the last decades. A great deal of attention has been paid to the process of spontaneous parametric... 

M.J. McCarthy and D.C. Hanna, Continuous-Wave Mode-Locked Singly Resonant Optical Parametric Oscillator Synchronously Pumped by a Laser-Diode-Pumped Nd-.YLF Laser , Opt. Lett. 17, 402 (1992). 

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