The nanocomposites were characterized for the morphology, mechanical, crystallization, and thermal properties through field emission transmission electron microscopy (FETEM), tensile testing, differential scanning calorimeter (DSC), and thermogravimetric analysis (TGA). FETEM analysis showed that MWNTs were homogeneously dispersed in MCPA6 matrix. The initial tensile strengths and tensile modulus of the nanocomposite with 1.5 wt % loading of MWNTs were enhanced by about 16 and 13%, KPT-8602 respectively, compared with the corresponding
values for neat MCPA6. DSC analysis indicated that the crystallization temperature of the nanocomposites was increased by 8 degrees C by adding 1.5 wt % MWNTs compared with pure MCPA6. Besides, it was found that the thermal stability of MCPA6 was improved by the addition of the MWNTs. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 3620-3626, 2009″
“For isovalent impurities such as Be, Mg, Ca, Sr, and SBC-115076 in vitro Cd and group-I element such as Na in ZnO, first-principles local-density-functional calculations show that the interstitial position of H depends on the type of impurities, either occupying a bond center (BC) site or an antibonding (AB) site adjacent to the impurity atom. The AB site is more favorable in the vicinity of Na, Ca, Sr, and Cd, while the stable position is the BC site in the case of Be. We find that both electronegativity
and atomic size play a role in switching the H interstitial position between the BC and AB sites. Previous studies have suggested that two infrared lines observed at 3611 and 3326 cm(-1) result from hydrogen atoms positioned at BC and AB sites, respectively. The results for the H bonding sites ACY-1215 ic50 and defect concentrations suggest that Ca is the most probable impurity as the origin of the infrared line at 3326 cm(-1). However, for impurities around which H is positioned at the AB site,
the calculated local vibrational frequencies are found to be similar to within 30 cm(-1), making it difficult to determine the specific impurity responsible for the 3326 cm(-1) line.”
“Background: The true incidence and primary predictors of foot compartment syndrome remain controversial. Our aim was to better define the overall incidence of foot compartment syndrome in relation to the frequency and location of various foot injuries. We hypothesized that (1) the incidence would increase in proportion to the number of anatomic locations of injury, (2) the incidence would be higher in association with hindfoot and crush injuries compared with any other injury categories, and (3) not only would the incidence associated with calcaneal fractures be lower than the often quoted 10% but foot compartment syndrome would also be fairly uncommon after such fractures.
Methods: The National Trauma Data Bank was used to identify. patients who had undergone a fasciotomy for the treatment of isolated foot compartment syndrome.