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121.
We report the twin-coupled multi-oriented domain structures in the epitaxial BZT20 (20%Zr) films grown on the (001) MgO substrate using pulsed-laser deposition. Transmission electron microscopy shows that the film consists of an epitaxial layer of pseudo-cubic perovskite structure and a nanopillar layer of multi-oriented twin domain structures near the surface. Four types of the twin domains were formed in the nanopillar layers by coherently joining their {111} with the epilayer and aligning their ?110? directions parallel to the ?110? axes of the epilayer. A non-uniform polarization switching behavior was observed due to the formation of such complex structure in the BZT20 films. 相似文献
122.
Yusuke Iguchi Zoltán Erdélyi Gábor A. Langer Eisuke Magome Kazushi Sumitani Attila Csik 《Philosophical Magazine Letters》2013,93(12):697-702
Amorphous Si/Ge multilayers containing diffuse interfaces have been prepared, heated in an ultra-centrifuge and subsequent interface structure modifications observed by X-ray reflectivity. The thickness of the Si/Ge and Ge/Si interface zones became asymmetrical owing to various effects occurring on the different atoms parallel to the direction of gravity-induced diffusion. The technique could prove useful for tuning physical (electronic, magnetic or optical) properties of layered structures. 相似文献
123.
A theoretical debate in artificial grammar learning (AGL) regards the learnability of hierarchical structures. Recent studies using an AnBn grammar draw conflicting conclusions (Bahlmann and Friederici, 2006 and
[De Vries et al., 2008]
). We argue that 2 conditions crucially affect learning AnBn structures: sufficient exposure to zero-level-of-embedding (0-LoE) exemplars and a staged-input. In 2 AGL experiments, learning was observed only when the training set was staged and contained 0-LoE exemplars. Our results might help understanding how natural complex structures are learned from exemplars. 相似文献
124.
Scholars in the field of community psychology have called for a closer examination of the mediating role that religious congregations serve in society, especially in relation to the promotion of social justice. The current study provides such an examination, offering a multilevel examination of religious individuals (n = 5,123) nested within religious congregations (n = 62) with a particular focus on how individual and congregational level variables (i.e. theological orientation, frequency of religious attendance, bonding and bridging social capital) predict individual prioritization of and participation in congregational social justice activities. Findings indicated that individual level theological orientation was associated with prioritization, and demographics and social capital bonding were associated with prioritization and participation. Furthermore, congregational bridging social capital was associated with the prioritization of justice, whereas congregational theological orientation moderated the associations between frequency of religious participation for both prioritization of and participation in congregational justice activities. These findings show that specific aspects of the congregational setting (i.e., congregational theological orientation) are important to the individual prioritization of and participation in social justice activities. These findings provide support for the role of religious congregations as mediating structures for social justice. Implications for future research are also discussed. 相似文献
125.
Alexis Papazoglou 《Metaphilosophy》2012,43(1-2):2-19
This article offers the motivation for organising a conference on philosophy as it is practised across several faculties and departments at the University of Cambridge. It also offers an overview of the main themes that emerge in the essays collected in this issue of Metaphilosophy, which derive from the aforementioned conference. In particular it focuses on the risk of scholasticism and dogmatism that philosophy faces when it divorces itself from its own history, other disciplines, and real life. It then discusses the potential problems that can arise from the practice of philosophy in close conjunction with other disciplines, such as the natural sciences and the history of philosophy. Finally, it briefly comments on how institutional/academic structures have an influence on the way philosophy is practised. 相似文献
126.
自我神经基础的探讨常基于自我相关加工的研究, 涉及皮质中线结构各个脑区甚至全脑协同作用。内侧前额叶皮质及其次成分在自我相关加工中发挥重要作用:腹内侧前额叶皮质较多支持默认模式下的自我加工、自我信息的觉察和“在线”自我加工, 背内侧前额叶皮质主要参与有意识的自我参照加工、自我信息的评价和“主导的”自我加工。在自我-他人表征中, 自我-他人表征的情感性、认知性和文化性因素均调节内侧前额叶皮质及次成分的活动。未来在动态的时间和人际背景中解析自我加工的神经机制是重要的研究方向。 相似文献
127.
Latent variable modeling in heterogeneous populations 总被引:20,自引:0,他引:20
Bengt O. Muthén 《Psychometrika》1989,54(4):557-585
Common applications of latent variable analysis fail to recognize that data may be obtained from several populations with different sets of parameter values. This article describes the problem and gives an overview of methodology that can address heterogeneity. Artificial examples of mixtures are given, where if the mixture is not recognized, strongly distorted results occur. MIMIC structural modeling is shown to be a useful method for detecting and describing heterogeneity that cannot be handled in regular multiple-group analysis. Other useful methods instead take a random effects approach, describing heterogeneity in terms of random parameter variation across groups. These random effects models connect with emerging methodology for multilevel structural equation modeling of hierarchical data. Examples are drawn from educational achievement testing, psychopathology, and sociology of education. Estimation is carried out by the LISCOMP program.Presidential address delivered at the Psychometric Society meetings in Los Angeles, USA and Leuven, Belgium, July 1989. The research was supported by Grant No. SES-8821668 from the National Science Foundation and by Grant No. OERI-G-86-003 from the Office for Educational Research and Improvement, Department of Education. I thank Leigh Burstein, Mike Hollis, Linda Muthén, and Albert Satorra for helpful discussions and Tammy Tam, Jin-Wen Yang, Suk-Woo Kim, and Lynn Short for computational assistance. Designs were created by Arlette Collier, Rita Ling and Jennifer Edic-Bryant. 相似文献
128.
Sample size and bentler and Bonett's nonnormed fit index 总被引:4,自引:0,他引:4
Kenneth A. Bollen 《Psychometrika》1986,51(3):375-377
Bentler and Bonett's nonnormed fit index is a widely used measure of goodness of fit for the analysis of covariance structures. This note shows that contrary to what has been claimed the nonnormed fit index is dependent on sample size. Specifically for a constant value of a fitting function, the nonnormed index is inversely related to sample size. A simple alternative fit measure is proposed that removes this dependency. In addition, it is shown that this new measure as well as the old nonnormed fit index can be applied to any fitting function that measures the deviation of the observed covariance matrix from the covariance matrix implied by the parameter estimates for a model. 相似文献
129.
Linear structural equations with latent variables 总被引:2,自引:0,他引:2
An interdependent multivariate linear relations model based on manifest, measured variables as well as unmeasured and unmeasurable latent variables is developed. The latent variables include primary or residual common factors of any order as well as unique factors. The model has a simpler parametric structure than previous models, but it is designed to accommodate a wider range of applications via its structural equations, mean structure, covariance structure, and constraints on parameters. The parameters of the model may be estimated by gradient and quasi-Newton methods, or a Gauss-Newton algorithm that obtains least-squares, generalized least-squares, or maximum likelihood estimates. Large sample standard errors and goodness of fit tests are provided. The approach is illustrated by a test theory model and a longitudinal study of intelligence.This investigation was supported in part by a Research Scientist Development Award (KO2-DA00017) and a research grant (DA01070) from the U. S. Public Health Service. 相似文献
130.
This paper shows how LISREL may be used to estimate simplex models which impose constraints on the variances of endogenous variables. This technique allows us to estimate both the parameters and the standard errors of the correlated measurement error model proposed by Wiley and Wiley (1974).We would like to thank Jim Wiley for his many helpful comments and suggestions on an earlier draft. We are grateful also to an anonymous reviewer for supplying the EQS program presented in Figure 4. 相似文献