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Guo Yanlong,Wang Hui 大田大學校 大學院 2018 大田大學校 大學院 論文集 Vol.20 No.1
The classic capital asset pricing model theory assumes that the market is valid and that the company's idiosyncratic volatility can be effectively decomposed by constructing the portfolio, and the idiosyncratic volatility of the firm is independent of the expected return and does not require additional compensation. However, more and more scholars have found that there is a clear negative correlation between the company' idiosyncratic volatility and the expected return, contrary to the traditional capital asset pricing theory. So far, there is no definite theory can completely explain this negative correlation. This paper selected the daily and monthly data of China's stock market from January 1, 2016 to December 31, 2016, and used the Fama-French 3-factor model to measure the monthly volatility of each stock on the GEM market. Using univariate combination analysis and bivariate combination analysis to study what the effect of idiosyncratic volatility is acting on expected returns.
Influence of δ' Phase with GP‑I Zones Fillings on Slip Behavior and Cold Rolling Texture in AA2099
Xusheng Yang,Weijiu Huang,Xianghui Zhu,Fei Guo,Yanlong Ma,Linjiang Chai,Ran Zhang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
The cold rolling texture of AA2099 sheets was strongly influenced by the prior heat treatment. Two typical heat treatments,including solid solution (T4) and underaging (T6) were utilized to control slip behavior by different precipitates during coldrolling. A much weaker texture with an orientation scatter towards higher Φ angles was found in the as-rolled T6 specimen(T6R). Slip behavior was analyzed using geometry necessary boundaries distribution. Results show that the T6R specimenexperienced a strong co-planar slip compared to the as-rolled T4 specimen. Prosperity of co-planar slips and limitation ofco-direction slips were main reasons for the weakening of Copper texture component in the T6R specimen. The distinguishslip behavior was caused by existence of δ' phase with GP-I zones fillings in the T6 specimen. This phase could be easilysheared by dislocations and then promoted co-planar slips in further deformation.
He, Qubo,Pan, Fusheng,Wang, Dongzhe,Liu, Haiding,Guo, Fei,Wang, Zhongwei,Ma, Yanlong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1
The microstructure and texture of three 316L foils of 25 ㎛ thickness, which were subjected to different manufacturing process, were systematically characterized using advance analytical techniques. Then, the electrochemical property of the 316L foils in simulated pressurized water reactor (PWR) solution was analyzed using potentiodynamic polarization. The results showed that final rolling strain and annealing temperature had evident effect on grain size, fraction of recrystallization, grain boundary type and texture distribution. It was suggested that large final rolling strain could transfer Brass texture to Copper texture; low annealing temperature could limit the formation of preferable orientations in the rolling process to reduce anisotropy. Potentiodynamic polarization test showed that all samples exhibited good corrosion performance in the simulated primary PWR solution.