The degenerative changes in the cervical spine seem to be related to these velocity changes in the subgroup of patients who are also affected with vertigo. The pretransverse segment of the VA provides valuable measurements as well as transverse segment of the VA, and it can be used as an appropriate
segment for CDUS examination in cervical spondylosis and associated vertigo.”
“To extend the application of a carbon dioxide sourced environmental friendly polymer: poly (propylene carbonate) (PPC), a small amount of maleic anhydride (MA) was melt blended to end-cap with PPC to improve its thermal stability and mechanical properties. Thermal and mechanical properties of end-capped PPC were investigated by TGA, GPC, mechanical test, and DMA. TGA and titration results demonstrate that PPC can be easily end-capped with MA through simple melt Cytoskeletal Signaling inhibitor blending. TGA results show that the thermal degradation temperature of PPC could be improved by around 140 degrees C by adding MA. GPC measurement Tariquidar purchase indicates that the molecular weight of PPC can be maintained
after blending with MA, where pure PPC experiences a dramatic degradation in molecular weight during melt process. More importantly, the tensile strength of PPC after blending with MA was found to be nearly eight times higher than that of pure PPC. It has approached the mechanical properties of polyolefin polymers, indicating selleck products the possibility of replacing polyolefin polymers with PPC for low temperature applications. The method described here could be used to extend the applications of PPC and fight against the well
known global warming problem. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 120: 3565-3573, 2011″
“Synthesis of microcrystalline-ultrananocrystalline composite diamond (MCD-UNCD) films, which exhibit marvelous electron field emission (EFE) properties, was reported. The EFE of MCD-UNCD composite diamond film can be turned on at a low field as 6.5 V/mu m and attain large EFE current density about 1.0 mA/cm(2) at 30 V/mu m applied field, which is better than the EFE behavior of the nondoped planar diamond films ever reported. The MCD-UNCD films were grown by a two-step microwave plasma enhanced chemical vapor deposition (MPECVD) process, including forming an UNCD layer in CH(4)/Ar plasma that contains no extra H(2), followed by growing MCD layer using CH(4)/H(2)/Ar plasma that contains large proportion of H(2). Microstructure examinations using high resolution transmission electron microscopy shows that the secondary MPECVD process modifies the granular structure of the UNCD layer, instead of forming a large grain diamond layer on top of UNCD films. The MCD-UNCD composite diamond films consist of numerous ultrasmall grains (similar to 5 nm in size), surrounding large grains about hundreds of nanometer in size.