Their density can be reduced by growth conditions such as migration enhanced epitaxy that permit high quality overgrowths at temperatures as low as similar IWR-1-endo to 350 degrees C. Nevertheless, the ultimate performance
limitation of thick MQD based devices resides in the ability to realize low density of the deep levels relative to the density of SAQDs. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3359704]“
“Polyurethane rigid nanocomposite foams were synthesized by in situ-polymerization using both pristine and organically modified layered silicates. The effect of synthesis conditions, in particular the effect of different dispersing techniques, on morphology and mechanical properties of polyurethane nanocomposite foams was studied. To promote dispersion, clays were dispersed either in polyols or isocyanate and were subjected to a well known dispersion method, like ultrasonication, but also to a new dispersion method, based on microwaving. The morphological characterization Cl-amidine of the foams, carried on using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, proved that the technology
based on microwave processing is able to provide very good silicates dispersion and requires very short application time to be effective. Further confirmations of the importance of the clay organo-modifier are still present. Mechanical characterization of foams show that clay interferes with H-bond formation and then the overall compressive performance of PU nanocomposite foams depends on the competition between the positive reinforcing effect of clay and the negative effect on H-bond formation. (C) 2009 Wiley Periodicals, Inc. J Appl
Polym Sci 115: 3667-3674, 2010″
“Root fractures in nonendodontically treated teeth have been reported to occur primarily in Chinese. Two representative cases of vertical root fractures in nonendodontically treated teeth are presented. In the first case, there were vertical fractures in both mesial and distal roots of the mandibular right first R406 molar. In the second case, there were vertical fractures in the mesial roots of both the mandibular left and right first molars. Their radiographic features were obtained. Both had clinically intact crowns with no or minimal restorations and periodontal defects. Diagnosis could be obtained with the use of radiographic examination. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107: e39-e42)”
“Purpose: Evidence suggests that patients who gain knowledge perform better self-care, cope better and are more satisfied. Today, up-to-date and valid instruments for evaluating patient knowledge on chemotherapy are unavailable.