However, it has been reported that compositions of LTG grown by the Czochralski method deviates from the ideal stoichiometry to Ta-poor and Ga-rich material. In this work, to elucidate the energetic
stability of defects and their influences on electronic properties, defect formation energies, and electronic properties were calculated for perfect and defective LTG crystals by using first-principles calculations. The results with oxygen-rich assumption showed that Ga substitution on Ta site and Ta vacancy were the most energetically stable defects among various acceptor-like defects under low and high Fermi energy region, respectively. The most stable AZD3965 mouse cation vacancy V””’(Ta) could affect the electronic and optical properties of the LTG crystal, as the band gap of a crystal with V””’(Ta) has a smaller gap than other defects. (C) 2010 American Institute of Physics. [doi:10.1063/1.3514008]“
“Purpose: To evaluate the efficacy of susceptibility-weighted (SW) magnetic resonance (MR) imaging for the see more assessment of the post-treatment change
in oxygen saturation in the draining vein in patients with spinal arteriovenous malformation (AVM).
Materials and Methods: The study protocol was approved by the institutional review board, and written informed consent was obtained from all subjects. SW imaging was performed in 11 patients with spinal AVM before and after surgical or endovascular treatment. Eleven healthy subjects were included as a control group. A four-grade response scale was used for the visual assessment of the anterior spinal vein (ASV). For quantitative analysis, the phase value of the ASV was measured and oxygen saturation was calculated. Nonparametric multigroup comparison for visual assessment and one-way analysis of variance for quantitative
measurement of oxygen saturation were used as statistical tests for comparison among three groups (pretreatment patients, posttreatment patients, and control subjects).
Results: Complete shunt occlusion in all patients was confirmed by using conventional angiography. For visual assessment, the average score of the pretreatment group was significantly less than that P005091 clinical trial of the posttreatment and control groups. For quantitative analysis, the average oxygen saturation of the pretreatment group was significantly higher than that of the posttreatment and control groups, while no significant difference was observed between the posttreatment and control groups.
Conclusion: After treatment, normalization of increased oxygen saturation was noninvasively observed by using SW imaging in patients with spinal AVM. SW imaging can be a useful tool for the assessment of treatment efficacy in patients with spinal AVM. (C)RSNA, 2010″
“Vanadium dioxide exhibits a well-known insulator-to-metal transition during which several of its physical properties change significantly.