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MBE Growth and Characterization of MgS-Rich Zinc-Blende ZnxMg1−xS1−ySey Alloys
Richard T. Moug,Christine Bradford,Damien Thuau,Arran Curran,Richard J. Warburton,Kevin A. Prior 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Samples containing ZnMgSSe alloy were grown by using molecular beam epitaxy at 240 ℃ and were analyzed by using X-ray interference. The alloy composition was found to be Zn0.20Mg0.80S0.64Se0.36. The surfaces of these layers were found to be extremely flat, unlike MgS layers of similar thickness grown under identical conditions, which show pronounced ridges. Structures with Zn0.20Mg0.80S0.64Se0.36 barriers were grown with ZnSe quantum wells and showed good quantum confinement with a sharp PL peak. Calculations of the phase stability of ZnMgSSe alloys suggest that an alloy of this composition should phase separate. However, samples with this composition are demonstrably single phase, and the discrepancy with the calculation can be removed if the enthalpy of formation of zinc-blende MgS is reduced by less than 2 % to −231 kJ mol−1.
Surface Reconstructions of Zincblende MgS (100) Observed by Using RHEED
Richard T. Moug,Christine Bradford,Kevin A. Prior 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
RHEED patterns from zincblende MgS (100) surfaces have been observed during growth, during annealing, and both before and after irradiation of the surface with an Mg flux. The c(2×2) pattern is observed during growth and is stable during annealing, but a Mg flux removes it permanently. Exposing the surface to Mg at temperatures above 310 ℃ creates a rough 1×1 surface. Below that temperature, the surface is flatter, and a 4×1 reconstruction is observed with Mg irradiation, becoming a 2×1 reconstruction after annealing in vacuo. These results are compatable with a c(2×2) surface being formed from a ZnMgS alloy, which converts to a pure MgS 4×1 surface on Zn irradiation. The conversion from a 4×1 to a 2×1 surface results from the evaporation of excess Mg.
Troy Li,Akiro H. Duey,Christopher A. White,Amit Pujari,Akshar V. Patel,Bashar Zaidat,Christine S. Williams,Alexis Williams,Carl M. Cirino,Dave Shukla,Bradford O. Parsons,Evan L. Flatow,Paul J. Cagle 대한견주관절의학회 2023 대한견주관절의학회지 Vol.26 No.3
Background: In the past decade, the number of anatomic total shoulder arthroplasty (aTSA) procedures has steadily increased. Patients over 65 years of age comprise the vast majority of recipients, and outcomes have been well documented; however, patients are opting for definitive surgical treatment at younger ages.We aim to report on the effects of age on the long-term clinical outcomes following aTSA. Methods: Among the patients who underwent TSA, 119 shoulders were retrospectively analyzed. Preoperative and postoperative clinical outcome data were collected. Linear regression analysis (univariate and multivariate) was conducted to evaluate the associations of clinical outcomes with age. Kaplan-Meier curves and Cox regression analyses were performed to evaluate implant survival. Results: At final follow-up, patients of all ages undergoing aTSA experienced significant and sustained improvements in all primary outcome measures compared with preoperative values. Based on multivariate analysis, age at the time of surgery was a significant predictor of postoperative outcomes. Excellent implant survival was observed over the course of this study, and Cox regression survival analysis indicated age and sex to not be associated with an increased risk of implant failure. Conclusions: When controlling for sex and follow-up duration, older age was associated with significantly better patient-reported outcome measures. Despite this difference, we noted no significant effects on range of motion or implant survival.