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Biased dispersal of Metrioptera bicolor, a wing dimorphic bush-cricket

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A Cultural Dialogue in Red Wing

【摘要】<p>I spent three months in Red Wing, Minnesota in the US in the fallof last year, teaching in six schools with students ranging from preschoolersto senior high school adolescents. I learned a lot about the<br/>American education in a tangible way, and enjoyed my friendshipwith six local families.<br/></p>

《文化交流》 | 2016年4期 | By Li Xiaozhen

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The Story of a Psrrot Who Saved a Baby

【摘要】<p>我们听过忠犬救主人的故事,或是海豚帮助在海上发生危难的人们的故事……但你有听过鸟儿救人的故事吗?就在十年前,一只鹦鹉尽它所能挽救了一个幼小的新生命。<br/></p>

《疯狂英语·初中版》 | 2016年6期 | by Jennifer S. Holland

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A Review of Computational Aeroelasticity of CivilFan Blades

【摘要】<p>The aim of this paper is to present the state- of- the art in computational aeroelasticity methods that areavailable for analyzing fan blades on modern civil aircraft. Fan blades in modern high-bypass aero-engines typicallyproduce around 80% of the thrust. In order to improve specific fuel consumption and reduce the level of noise emittedfrom the engine, civil turbofan engine designs are moving toward even larger fan diameters with lower tip speeds andhence the importance of this component of aero- engine becomes even more prominent. To reduce weight, future fanblades will be made of composite materials and shorter intakes are used. The new designs are highly loaded and will bemore susceptible to aerodynamic and aeroelastic instabilities, and hence computationally efficient aeroelasticmodelling tools for such blades are paramount.</p><p><br/></p>

《风机技术》 | 2018年5期 | M. Vahdati K.B Lee S. Stapelfeldt

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Sisters-A Guide of Psychological Therapy

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《东方教育》 | 2016年3期 | 戴 炜

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A Review of the 30 Years of Cultural Dialogue

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《文化交流》 | 2016年1期 | By Zhu Fengjuan, our special reporter

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COOKING A WAY OUT OF POVERTY

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《中国东盟报道》 | 2019年6期 | ChenWeizan

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A Personal Tragedy The professionalism of Stevens

【摘要】<p>&nbsp;Kazuo Ishiguro (1954- ), known as the Nobel Laureate in 2017, is a distinguished contemporary Japanese- British writer. As Ishiguro’s third novel, The Remains of the Day was awarded The Man Booker Prize for Fiction in 1989 and soon adapted into an award-winning film in 1993. The protagonist Stevens, who is a traditional British butler in the novel, narrates what has happened during the six-day journey and recalls his early life in the form of diary. Quantities of discussions and researches have been made since its publication in 1989. This essay intends to analyze the professionalism, the core of Stevens’ values that overwhelms his other principles briefly, using the methods of text analysis and literature analysis. It is founded that the pursuit of his distorted professionalism makes him become a working machine. We can learn the importance of dealing with ethical value and ethical identity from Steven’s personal tragedy.&nbsp;</p>

《长江丛刊》 | 2018年13期 | 戴晨阳

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Nitrate Removal by a Permeable Reactive Barrier of Fe°: A Model-Based Evaluation

【摘要】<p>Permeable reactive barrier (PRB) filled with zero valent iron (ZVI, Fe°) can be an effective option to remove nitrate from contaminated groundwater. The long-term performance of such PRBs, however, might be compromised by the problem of declining reactivity and permeability, which could cause a decrease in the nitrate removal efficiency. In this study we explored suitable model formulations that allow for a process-based quantification of the passivation effect on denitrification rates and tested the model for a 40 years long operation scenario. The conceptual model underlying our selected formulation assumes the declining reactivity of the ZVI material through the progressing passivation caused by the precipitation of secondary minerals and the successive depletion of the ZVI material. Two model scenarios, i.e., the base model scenario which neglects the explicit consideration of the passivation effect and one performed with the model in which the impact of the passivation effect on denitrification was considered, were compared. The modeling results illustrate that nitrate removal in the model of considered passivation started to be incomplete after 10 years, and the effluent nitrate concentration of PRB rose up to 86% of the injected water concentration after 40 years, in contrast to the base scenario, corresponding well with the field observations of successively declining nitrate removal efficiencies. The model results also showed that the porosity of the PRB increased in both models. In order to improve and recover the reactivity of ZVI, pyrite was added to the PRB, resulting in completely nitrate removal and lower consumption of ZVI.</p><p><br/></p>

《地球科学学刊》 | 2017年3期 | Qinghua Wu

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