小学语文群文阅读教学策略浅析

群文阅读是对传统语文阅读教学方式的有效补充和重要创新,它在发展学生的高阶思维能力和阅读能力等方面有着重要作用,其最终目的是在学生学会阅读的基础上,落实学科核心素养。本文在对群文阅读进行理论分析的基础上,对小学语文教学中开展群文阅读的教学策略进行浅析。     

The convolution theorem for estimating linear functionals in indirect nonparametric regression models

Nonparametric regression—directly or indirectly observed—is one of the important statistical models. On one hand it contains two infinite dimensional parameters (the regression function and the error density), and on the other it is of rather simple structure. Therefore, it may serve as an interesting paradigm for illustrating or developing abstract statistical theory for non-Euclidean parameters. In this paper estimation of a linear functional of the indirectly observed regression function is considered, when a deterministic design is used. It should be noted that any Fourier coefficient of an expansion of the regression function in an orthonormal basis is such a functional. Because the design is deterministic the observables are independent but not identically distributed. Local asymptotic normality is established and applied to prove Hájek's convolution theorem for this functional. Pertinent references are Beran [1977. Robust location estimates. Ann. Statist. 5, 431–444] and McNeney and Wellner [2000. Application of convolution theorems in semiparametric models with non-i.i.d. data. J. Statist. Plann. Inference 91, 441–480]. For purposes explained above, however, the paper is kept self-contained and full proofs are provided.     

A note on replacement policy comparisons from NBUC lifetime of the unit

Age and block replacement policies are commonly used in order to reduce the number of in-service failures when the systems are functioning indefinitely. In reliability theory, the lifetime of a system can be modeled by means of the NBUC aging class that is characterized throughout comparisons of the residual lives in the sense of the icx order. The purpose of this paper is to establish stochastic comparisons between the age (block) replacement policy and a renewal process with no planned replacements when the lifetime of the unit is NBUC. Supported by Ministerio de Ciencia y Tecnología under grant BFM2000-0362     

Market reactions to acquisition announcements: The importance of signaling ‘why’ and ‘where’

Acquisitions are risky events but not all acquisitions involve the same levels of risk. We suggest that the announced acquisition motive – the ‘why’ of the acquisition – is an important risk signal. We categorize acquisition motives and distinguish between acquisitions with ‘pure explore’ and ‘pure exploit’ motives. Recognizing that most acquisitions have multiple motives, we identify acquisitions with ‘ambidextrous’ motives – that is different combinations of explorative and exploitative motives – too. Then, building on recent contributions to signaling theory, we argue that the ‘why’ will matter more, if the ‘where’ pertains to a high-risk setting. We measure this using target-to-acquirer industry relatedness. We find that the market reacts more positively to pure acquisitions, aimed at exploration or exploitation, compared to ambidextrous acquisitions. We show that the market reacts more positively to ambidextrous acquisitions orientated towards exploitation than ambidextrous acquisitions orientated toward exploration. Finally, we find that relatedness moderates this relationship, in that the market is more willing to tolerate exploration in a related industry. Our core contribution is to the literatures on acquisition motives and ambidexterity. We provide new insights into the incidence of specific motives, the ways in which they are mixed, and the market's reaction to their announcement. In addition, we contribute to the emerging literature that takes on behavioral perspective of market reactions by showing that the ‘why’ and ‘where’ of an acquisition matter.     

JEEA‐FBBVA LECTURE 2013: THE NEW EMPIRICAL ECONOMICS OF MANAGEMENT

Over the last decade the World Management Survey (WMS) has collected firm‐level management practices data across multiple sectors and countries. We developed the survey to try to explain the large and persistent total factor productivity (TFP) differences across firms and countries. This review paper discusses what has been learned empirically and theoretically from the WMS and other recent work on management practices. Our preliminary results suggest that about a quarter of cross‐country and within‐country TFP gaps can be accounted for by management practices. Management seems to matter both qualitatively and quantitatively for performance at the level of the firm and the nation. Competition, governance, human capital, and informational frictions help account for the variation in management. We make some suggestions for both policy and future research.     

Assimilation of immigrants: Implications for human capital accumulation of the second generation

Immigrants assimilate in various dimensions at different rates. Moreover, in each of these dimensions they assimilate at rates that may differ from those of their children. The purpose of this paper is to examine how the pace of assimilation of immigrants in various dimensions affects the rate of human capital accumulation of immigrant children. It is argued that rapid assimilation in certain dimensions serves to increase the rate of human capital accumulation of the second generation, while in other dimensions it may have the opposite effect.I thank Christoph Schmidt, Peter Schaeffer, and two anonymous referees for helpful comments. Responsible editor: Christoph M. Schmidt.     

方法论的运用与法哲学的定位

本文从方法论的角度对法哲学这门学科的性质作了科学的分析 ,从而使我们在自觉的基础上建设法哲学学科     

Trust in humans and robots: Economically similar but emotionally different

Trust-based interactions with robots are increasingly common in the marketplace, workplace, on the road, and in the home. However, a valid concern is that people may not trust robots as they do humans. While trust in fellow humans has been studied extensively, little is known about how people extend trust to robots. Here we compare trust-based investments and self-reported emotions from across three nearly identical economic games: human-human trust games, human-robot trust games, and human-robot trust games where the robot decision impacts another human. Robots in our experiment mimic humans: they are programmed to make reciprocity decisions based on previously observed behaviors by humans in analogous situations. We find that people invest similarly in humans and robots. By contrast the social emotions (i.e., gratitude, anger, pride, guilt) elicited by the interactions (but not the non-social emotions) differed across human and robot trust games. Emotional reactions depended on the trust game interaction, and how another person was affected.