Institution
Aoyama Gakuin University
Education•Tokyo, Japan•
About: Aoyama Gakuin University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Superconductivity & Thin film. The organization has 3494 authors who have published 6419 publications receiving 115648 citations. The organization is also known as: Aoyama gakuin daigaku.
Papers published on a yearly basis
Papers
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TL;DR: In this article, it was shown that, under some generic assumptions, shocks cannot accelerate particles unless the overall shock Mach number exceeds a critical value M > sqrt(5), i.e., the work done to compress the flow in a particle precursor requires more enthalpy flux than the system can sustain.
Abstract: It is shown that, under some generic assumptions, shocks cannot accelerate particles unless the overall shock Mach number exceeds a critical value M > sqrt(5). The reason is that for M <= sqrt(5) the work done to compress the flow in a particle precursor requires more enthalpy flux than the system can sustain. This lower limit applies to situations without significant magnetic field pressure. In case that the magnetic field pressure dominates the pressure in the unshocked medium, i.e. for low plasma beta, the resistivity of the magnetic field makes it even more difficult to fulfil the energetic requirements for the formation of shock with an accelerated particle precursor and associated compression of the upstream plasma. We illustrate the effects of magnetic fields for the extreme situation of a purely perpendicular magnetic field configuration with plasma beta = 0, which gives a minimum Mach number of M = 5/2. The situation becomes more complex, if we incorporate the effects of pre-existing cosmic rays, indicating that the additional degree of freedom allows for less strict Mach number limits on acceleration. We discuss the implications of this result for low Mach number shock acceleration as found in solar system shocks, and shocks in clusters of galaxies.
40 citations
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TL;DR: This study examines high-dimensional forecasting and variable selection via folded-concave penalized regressions using the mixed data sampling (MIDAS) framework with penalization and shows that a penalized regression provides remarkable results in terms of forecasting performance andVariable selection.
Abstract: SummaryThis study examines high-dimensional forecasting and variable selection via folded-concave penalized regressions. The penalized regression approach leads to sparse estimates of the regression coefficients and allows the dimensionality of the model to be much larger than the sample size. First, we discuss the theoretical aspects of a penalized regression in a time series setting. Specifically, we show the oracle inequality with ultra-high-dimensional time-dependent regressors. Then we show the validity of the penalized regression using two empirical applications. First, we forecast quarterly US gross domestic product data using a high-dimensional monthly data set and the mixed data sampling (MIDAS) framework with penalization. Second, we examine how well the penalized regression screens a hidden portfolio based on a large New York Stock Exchange stock price data set. Both applications show that a penalized regression provides remarkable results in terms of forecasting performance and variable selection.
40 citations
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Mälardalen University College1, Stockholm University2, University of Maryland, College Park3, Chinese Academy of Sciences4, University of South Carolina5, University of Ghana6, Satbayev University7, Linköping University8, National Research Council9, Trinity College, Dublin10, Koç University11, Shahid Beheshti University12, Collegio Carlo Alberto13, Alliant International University14, Kazakh-British Technical University15, National Scientific and Technical Research Council16, National University of Cordoba17, Sunway University18, Pontifical Catholic University of Peru19, University of Social Sciences and Humanities20, University of Innsbruck21, Moscow State University22, Hanoi National University of Education23, University of Los Andes24, University of Banja Luka25, Sungkyunkwan University26, Universidad Autónoma Metropolitana27, University of Lisbon28, Brunel University London29, University of Colombo30, University of Cologne31, National Autonomous University of Mexico32, University of Amsterdam33, University of Minnesota34, York University35, Max Planck Society36, New York University37, Eötvös Loránd University38, University of Iceland39, Academy of Sciences of the Czech Republic40, Yerevan State University41, Saint Petersburg State University42, Slovak Academy of Sciences43, Singapore Management University44, University of Kent45, Daugavpils University46, International Institute of Minnesota47, Aoyama Gakuin University48, University of Trnava49, National Economics University50, University of Melbourne51, Nagoya University52, University of Western Ontario53, Tallinn University54, American University of Sharjah55, Eduardo Mondlane University56, Chulalongkorn University57, Islamic University58, Open University of Israel59, University of Trinidad and Tobago60, University of Haifa61, University of Nigeria, Nsukka62, University of Patras63, Diego Portales University64, University of Botswana65, University of Helsinki66, Queen's University67, ISCTE – University Institute of Lisbon68, University of Turin69, Universidad San Francisco de Quito70, University of Eastern Finland71, University of Navarra72, Kwansei Gakuin University73, Johannes Kepler University of Linz74, Shiga University75, Université Félix Houphouët-Boigny76, Mackenzie Presbyterian University77, The Chinese University of Hong Kong78, National and Kapodistrian University of Athens79, Airlangga University80, Guangzhou Higher Education Mega Center81, VU University Amsterdam82
TL;DR: In this article, the authors measured perceptions of the appropriateness of various responses to a violation of a cooperative norm and to atypical social behaviors, including confrontation, social ostracism and gossip.
Abstract: Norm enforcement may be important for resolving conflicts and promoting cooperation. However, little is known about how preferred responses to norm violations vary across cultures and across domains. In a preregistered study of 57 countries (using convenience samples of 22,863 students and non-students), we measured perceptions of the appropriateness of various responses to a violation of a cooperative norm and to atypical social behaviors. Our findings highlight both cultural universals and cultural variation. We find a universal negative relation between appropriateness ratings of norm violations and appropriateness ratings of responses in the form of confrontation, social ostracism and gossip. Moreover, we find the country variation in the appropriateness of sanctions to be consistent across different norm violations but not across different sanctions. Specifically, in those countries where use of physical confrontation and social ostracism is rated as less appropriate, gossip is rated as more appropriate.
40 citations
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TL;DR: The authors argue that cross-cultural dialogue on ethics can lead to the creation of synergetic "third cultures" which integrate positive aspects of each of the original cultures in novel ways, and examine the concept of integration at three different levels: (1) the individual/psychological level; (2) the interpersonal/intercultural level; and (3) the formal level.
40 citations
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TL;DR: The propagation phenomena of guided waves in a bended pipe were investigated using a wideband laser ultrasonic system and indicated the amplitude of the F(1,1) mode converted from the L(0, 1) mode increased with the increase of the bending angle.
40 citations
Authors
Showing all 3525 results
Name | H-index | Papers | Citations |
---|---|---|---|
Katsuhiko Mikoshiba | 120 | 866 | 62394 |
Tadayuki Takahashi | 112 | 932 | 57501 |
Takaaki Tanaka | 105 | 321 | 41804 |
Yasunobu Uchiyama | 105 | 373 | 39610 |
Sang-Wook Cheong | 79 | 645 | 37338 |
T. Sakamoto | 65 | 523 | 17443 |
Yutaka Saito | 64 | 516 | 17729 |
Nakao Iwata | 64 | 548 | 24469 |
Ryo Yamazaki | 59 | 317 | 16782 |
Takeshi Go Tsuru | 59 | 405 | 13507 |
Masahiro Yamashita | 58 | 573 | 15371 |
Toshio Yamagishi | 52 | 152 | 12998 |
Jun Akimitsu | 52 | 608 | 11035 |
Kazutaka Yamaoka | 51 | 372 | 11846 |
Aya Bamba | 50 | 306 | 13253 |