(C) 2008 Wiley Periodicals, Inc. j Appl Polyni Sci 112: 1-8, 2009″
“A single-phased PrCo2B2 compound was prepared by an arc-melting method. The magnetic properties and magnetocaloric effect (MCE) were studied by the magnetization and heat capacity measurement. The compound exhibits a single paramagnetic to ferromagnetic

transition at the Curie temperature T-C of 18 K. A large reversible MCE was observed which is related to a second order magnetic transition from paramagnetic to ferromagnetic state. The values of maximum magnetic entropy change (-Delta S-M(max)) reach 4.9 and click here 9.6 J Kg(-1) K-1 for the field change of 2 and 7 T with no obvious hysteresis loss in the vicinity of the Curie temperature, respectively. The corresponding maximum adiabatic temperature changes (Delta T-ad(max)) are evaluated to be 4.3 and 9.8 K. The magnetic transition and the origin of large MCE in PrCo2B2 were discussed. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3173565]“
“In this work, several beta-zeolite-incorporated

see more polymer composite membranes were fabricated with the solution-casting, method. The zeolite loadings were 10, 20, and 30 wt % respectively. Scanning electron microscopy characterization showed that the zeolite particles could be uniformly distributed in the whole polymer matrix. Gas permeation results demonstrated that after the incorporation of the same beta-zeolite, the polyimide exhibited a significant increase in gas Permeability but a decrease in permselectivity, MCC950 mechanism of action and both were quite pronounced at high zeolite loadings; this resulted from the loose structure that formed. The poly(ether sulfone) composite membranes showed obvious increases in both permeability and selectivity, and the permeability increase Was considerably greater at higher zeolite loadings. The permselectivity increase could possibly be attributed to the pore sieving and preferential adsorption

of beta-zeolite entities for the test gases as the heat treatment may have resulted in the formation of a defect-free microstructure. However, breakthrough of the upper-bound line was not achieved for these composite membranes, as reflected by Robeson plots. Our results suggest that changes in membrane performance not only are attributable to the properties and content of beta-zeolite particles but also depend on the heterogeneous microstructure created by zeolite entities, (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 112: 9-18, 2009″
“Simulation of contrast formation in Auger electron imaging of surfaces is helpful for analyzing scanning Auger microscopy/microanalysis (SAM) images. In this work, we have extended our previous Monte Carlo model and the simulation method for calculation of scanning electron microscopy (SEM) images to SAM images of complex structures. The essentials of the simulation method are as follows.