Helioseismology with PICARD

PICARD is a CNES micro-satellite launched in June 2010 (Thuillier at al. 2006). Its main goal is to measure the solar shape, total and spectral irradiance during the ascending phase of the activity cycle. The SODISM telescope onboard PICARD also allows us to conduct a program for helioseismology in intensity at 535.7 nm (Corbard et al. 2008). One-minute cadence low-resolution full images are available for a so-called medium-$l$ program, and high-resolution images of the limb recorded every 2 minutes are used to study mode amplification near the limb in the perspective of g-mode search. First analyses and results from these two programs are presented here.Comment: 6 pages, 6 figures, Eclipse on the Coral Sea: Cycle 24 Ascending, GONG 2012 / LWS/SDO-5 / SOHO 27, November 12 - 16, 2012, Palm Cove, Queensland. Accepted for publication in Journal of Physics Conference Series on March 1st 201

Analytical Study of Multipass Laminar Counterflow Mass Exchangers through a Parallel-Plate Channel

[[abstract]].A multipass mass exchanger through a parallel-plate channel by inserting three permeable barriers with uniform wall concentration was designed and the mathematical formulation was investigated for solving such a conjugated Graetz problem by using an orthogonal expansion technique. Considerable improvement in the mass-transfer efficiency is obtainable by such multipass operations with suitable adjustment of the permeable-barrier locations. Comparisons of analytical results have shown that the multipass device can enhance the mass-transfer efficiency compared with those of the single-pass (without permeable barrier inserted) and double-pass operations of the same size in the previous work. The ratio of the improvement of transfer efficiency to the increment of power consumption has been determined to make good economic sense.[[notice]]補正完畢[[incitationindex]]SCI[[incitationindex]]E