Recovering information of tunneling spectrum from Weakly Isolated Horizon

In this paper we investigate the properties of tunneling spectrum from weakly isolated horizon(WIH). We find that there are correlations among Hawking radiations from weakly isolated horizon, the information can be carried out in terms of correlations between sequential emissions, and the radiation is an entropy conservation process. We generalize Refs.[11-13]' results to a more general spacetime. Through revisiting the calculation of tunneling spectrum of weakly isolated horizon, we find that Ref.[12]'s requirement that radiating particles have the same angular momenta of unit mass as that of black hole is not needed, and the energy and angular momenta of emitting particles are very arbitrary which should be restricted only by keeping the cosmic censorship of black hole

Understanding Investment – the Effects of Language

Investment, as a major part of business activities, has always been a popular topic of business research. Economic and financial scientists have identified a lot of financial factors that have been publicly recognized as investment influencers. However, there are relatively few researchers trying to identify behavioral factors that have an impact on investment. Having a business and psychology background, I am interested in exploring people’s investment behaviors from a behavioral-finance standpoint. Previous research has shown that languages differ in whether they require speakers to mark future events using grammatical markers, and this difference actually affects people’s saving behaviors. Considered the fact that savings and investment are highly correlated with each other, the purpose of my research is to see whether there is a similar relationship between languages and investment behaviors. I gather information of 23 languages representing 37 countries as well as the domestic stock market participation rates and foreign equity holding rates of these countries. These two types of rates serve as my indicators of people’s investment behaviors. The main method used in my study is regression analysis. Current progress shows that although other major investment influencers have been controlled in the regression, languages do not seem to have a statistically significant impact on investment. This result is not consistent with the finding of the previous research that languages affect savings. Therefore, besides helping people know more about the underlying mechanism of their investment behaviors, my study provides evidence to question the methods and the finding of the previous research.No embargoAcademic Major: Financ

セルラ分散MU-MIMO通信システムの干渉制御

Tohoku University博士（工学）thesi

Design, construction and characterization of a wind tunnel

The wind tunnel is the most fundamental test equipment for aircraft testing and studying aerodynamics. Because of the complexity of the test-subject\u27s geometry, it is difficult to study the aerodynamic pattern simply based on theoretical calculations. Most of the aerodynamics experiments still use wind tunnels. The progress of the wind tunnel is highly related to the advancements in air crafts. Aircraft manufacturing has pushed the wind tunnel technology forward. Wind tunnels can be categorized by the wind speed limit differences, which are controlled by the mechanism of the driving methods, structure applications, etc. In this case, we built a small scale wood based wind tunnel for future testing of “Magnetic Augmented Rotational System (MARS)”. This thesis discusses the low speed wind tunnel, subsonic wind tunnel, transonic wind tunnel, supersonic wind tunnel, hypersonic wind tunnel, high enthalpy hypersonic wind tunnel, and puts the focus on low speed wind tunnel. The characteristics of the low speed wind tunnel and the related data will be presented along with its advantages and shortcomings