以网络百科为平台发展学生在物理化学课程学习中的批判性思维

文章探索了一种大学生批判性思维的培养模式。讨论了批判性思维的重要意义、介绍了利用网络百科实施课堂教学的方法和步骤、对反馈结果进行分析。实践结果表明教学效果良好。     

"Cognitive-neuropsychological function in chronic physical aggression and hyperactivity": Correction to Séguin et al. (2004).

Reports an error in "Cognitive-Neuropsychological Function in Chronic Physical Aggression and Hyperactivity" by Jean R. Séguin, Daniel Nagin, Jean-Marc Assaad and Richard E. Tremblay (Journal of Abnormal Psychology, 2004[Nov], Vol 113[4], 603-613). The use of a weighted procedure within SAS PROC GLM inflated F statistics and underestimated standard errors that affected only conclusions from secondary analyses that were drawn about the specificity of working memory effects to physical aggression and hyperactivity. The corrected conclusions are presented in the erratum. The last two sentences of the abstract also needed to be corrected in order to reflect the new conclusions. The corrected sentences appear in the erratum as well. (The following abstract of the original article appeared in record 2004-20178-011.) Histories of violence and of hyperactivity are both characterized by poor cognitive-neuropsychological function. However, researchers do not know whether these histories combine in additive or interactive ways. The authors tested 303 male young adults from a community sample whose trajectories of teacher-rated physical aggression and motoric hyperactivity from kindergarten to age 15 were well defined. No significant interaction was found. In a 1st model, both histories of problem behavior were independently associated with cognitive-neuropsychological function in most domains. In a 2nd model controlling for IQ, general memory, and test motivation, the 3 working-memory tests (relevant to executive function) remained associated with physical aggression, and 1 remained associated with hyperactivity. These results support an additive model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Determination of nutrients and volatile constituents of Agaricus bisporus (brown) at different stages

BACKGROUND: The physical properties, proximate composition, mineral and vitamin contents, and estimated volatile components of Portobello mushroom, Agaricus bisporus (brown), were analyzed in three flushes and at two different harvest times. The results showed different trends in the flushes and harvest terms studied. RESULTS: The mean values of texture, diameter, and protein of the harvested produce were 1.78–1.97 kg mm^?2, 4.67–5.02 cm, and 4.18–3.31% wet weight basis (wb), respectively. The mean Zn, Fe, P, Mg, K, Na, and Ca contents of both harvests (mg kg^?1 wb) were 8.15–7.07, 7.40–7.96, 1180.93–1038.69, 88.05–76.29, 213.29–238.82, 2652.0–2500.89, and 534.2–554.80, respectively. In terms of vitamin C, folic acid, thiamin, riboflavin, and niacin, the mean contents (mg kg^?1 wb) were 6.75–3.97, 0.09–0.08, 0.085–0.09, 0.27–0.29, and 3.62–2.94, respectively. The estimated volatile components comprised 18‐ or 16‐carbon compounds such as octadecanoic acid, hexadecanoic acid derivatives, and other important volatiles like dl‐limonene, n‐nonane, benzendicarboxylic acid, and cis‐linoleic acid esters. CONCLUSION: Nutritive contents and estimated volatiles of Portobello mushroom were evaluated in detail at different stages. Copyright © 2009 Society of Chemical Industry     

基于道路生态设计的长江口细砂路用性能分析

长兴岛土地资源欠缺,而砂极为丰富,从环境可持续发展的思想出发,考虑将长江口细砂作为高等级公路的路基材料。通过建试验路段开展了长江口细砂的物理特性、力学特性的研究,表明单纯长江口细砂在CBR值等方面不能满足高等级公路的要求。为此通过添加混合料来改善细砂性能。试验结果选用:石灰∶粉煤灰∶细砂为4∶8∶88和3∶6∶91(体积比)的混合料作为试验段实铺路基材料。     

A Study on the Formation and Removing Mechanisms of a Gas Hydrate Slug in Gas Pipelines

Most of the existing hydrate prediction models cannot describe the formation process of hydrate slug in gas pipelines. The authors developed the physical model of hydrate formation state in gas pipelines, and the corresponding mathematical model is proposed by utilizing the theories of heat transfer, multiphase flow, and phase equilibrium. The formation process of hydrate slug is described by simulation, and the removing mechanism of hydrate slug using depressurization is analyzed. The change of related parameters is obtained. which can effectively provide theoretical guidance for preventing and removing the hydrate slug.     

An edge-based platform for dynamic Smart City applications

A Smart City is a cyber–physical system improving urban behavior and capabilities by providing ICT-based functionalities. An infrastructure for Smart City has to be geographically and functionally extensible, as it requires both to grow up with the physical environment and to meet the increasing in needs and demands of city users/inhabitants. In this paper, we propose iSapiens, an IoT-based platform for the development of general cyber–physical systems suitable for the design and implementation of smart city services and applications. As distinguishing features, the iSapiens platform implements the edge computing paradigm through both the exploitation of the agent metaphor and a distributed network of computing nodes directly scattered in the urban environment. The platform promotes the dynamic deployment of new computing nodes as well as software agents for addressing geographical and functional extensibility. iSapiens provides a set of abstractions suitable to hide the heterogeneity of the physical sensing/actuator devices embedded in the system, and to support the development of complex applications. The paper also furnishes a set of methodological guidelines exploitable for the design and implementation of smart city applications by properly using iSapiens. As a significant case study, the design and implementation of a real Smart Street in the city of Cosenza (Italy) are shown, which provides decentralized urban intelligence services to citizens.     

两个自旋为1/2粒子在纠缠量子系统中的Berry几何相位

研究了两个自旋为1/2的粒子在自旋相互作用情况下的Berry几何相位纠缠依赖，分别计算了两个自旋为1/2的纠缠粒子之间在存在自旋相互作用和无相互作用下的Berry几何相位，并得到在纠缠消失时几何相位的计算表达式.而且我们还讨论了两个粒子中只有一个粒子受到外磁场作用时的几何相位.结果发现其几何相位并不等于单个粒子在受到外磁场作用时的几何相位，而是与影响自旋纠缠强度作用的 有关,同时还得到了几何相位依赖于纠缠的的普遍公式.     

湮没算符k次幂本征态的Wigner函数及其非经典特性

利用Fock态表象下的Wigner函数表达式，重构了湮没算符k次幂本征态的Wigner函数，并依据Wigner函数在相空间的分布规律，讨论了湮没算符k次幂本征态的非经典特性．数值结果表明：湮没算符k次幂本征态的Wigner函数的分布与复参数α的取值有关；湮没算符1次幂的本征态(即相干态)为准经典态(其Wigner函数值总是非负的)，而湮没算符大于或等于2次幂的本征态则都具有明显的非经典特性(它们的Wigner函数均出现了负值).