加拿大TESL和EAP与中国大学英语比较研究     

杨金良  戚建平  李青山 《教育与职业》2007,(11):60-62

本文在考察研究加拿大汉伯学院英语培训项目(TESL和EAP)的基础上,以现代语言教学理论为指导,从师资素质、教学模式、课程大纲、课堂管理、学生评估等方面比较分析了该院TESL和EAP项目与我国大学英语教学的异同.  相似文献   

Modeling of D-STATCOM in distribution systems load flow   总被引：1，自引：0，他引：1  

HOSSEINI Mehdi SHAYANFAR Heidar Ali FOTUHI-FIRUZABAD Mahmud 《浙江大学学报(A卷英文版)》2007,8(10):1532-1542

This paper presents modeling of Distribution STATCOM (D-STATCOM) in load flow calculations for the steady- state voltage compensation. An accurate model for D-STATCOM is derived to use in load flow calculations. The rating of this device as well as the direction of required reactive power injection for voltage compensation in the desired value (1 p.u.) is de- rived and discussed analytically and mathematically by the phasor diagram method. Furthermore, an efficient method for node and line identification used in load flow calculations is presented. The validity of the proposed model is examined by using two standard distribution systems consisting of 33 and 69 nodes, respectively. The best location of D-STATCOM for under voltage problem mitigation approach in the distribution networks is determined. The results validate the proposed model for D- STATCOM in large distribution systems.  相似文献   

减少不确定性与含糊交际理论在交际中的运用     

胡洋 《四川职业技术学院学报》2007,17(3):5-47

语言交际是一种复杂的人类言语行为,交际者根据交际目的、环境,对象以及各种随机因素的交互作用而作出言语决策.语言交际策略的使用不但要遵循顺应理论的原则,而且还受元语言意识的影响.减少不确定性和含糊交际,作为大家经常使用的交际策略,它们的最终目的都是实现信息的交换,满足交际者的需求,顺利完成交际任务.  相似文献   

Equivalent Kelvin Impact Model for Seismic Pounding Analysis of Bridges     

DING Yang  YUE Fuqing  LI Zhongxian 《天津大学学报(英文版)》2006,12(Z1)

Based on Hertz contact theory, a method to determine the parameters of Kelvin impact model for seismic pounding analysis of bridges is proposed. The impact stiffness of Kelvin model is determined by the ratio of maximum impact force to maximum contact deformation, which is calculated based on Hertz contact theory with considering the vibration effect. The restitution coefficient which has great influence on the damping coefficient of Kelvin impact model is investigated by numerical analysis. Numerical results indicate that the impact stiffness of Kelvin impact model increases with the increment of the Hertz contact stiffness, approaching velocity or the length ratio of short to long girders. Vibration effect has remarkable influence on the impact stiffness and cannot be neglected. The restitution coefficient decreases when approaching velocity increases or the length ratio of short girder to long girder decreasing. The practical ranges of impact stiffness and restitution coefficient are obtained as 3×108-6×108 N/m and 0.6-0.95 respectively.  相似文献   

虚空与隔离——论《色·戒》的主题     

何锡章  温啸 《华中科技大学学报(社会科学版)》2002,16(6):69-72

《色·戒》是张爱玲后期创作中最精彩的一部小说。本文通过对《色·戒》一题中“色”、“戒”的分析解读 ,指出该小说的主题是“虚空”与“隔离”。其中“色”喻指美人计 ,“色”亦是“幻”——幻觉与引起幻觉的美人计中所呈现出的种种外在“色相”;“戒”实指钻戒 ,虚指人心隔防。“虚空”与“隔离”有着内在联系 ,佳芝的命运提醒人们外在“色相”不过是一种虚空 ,温柔的表相之下实则隐藏着人心隔防、猜忌的人生真实。这一主题亦体现了张爱玲对人生的体味  相似文献   

素质教育与教师的语言素质     

王林海  杨瑞勇 《继续教育研究》2003,(3):86-87

素质教育要以教师的高素质为前提，语言素质是教师优化课堂教学、培养学生素质的重要条件，历以教师语言应以规范性、准确性、清晰性为基础；以通俗性、简洁性、生动性为灵魂；以教育性、针对性、逻辑性为特色。  相似文献   

超大规模互联网教育组织的核心要素研究——在线教育有效支撑“停课不停学”案例分析     

黄荣怀  张慕华  沈阳  田阳  曾海军 《电化教育研究》2020,(3):10-19

我国有各级各类学校51.88万所、专任教师1672.85万人、在校生2.76亿人,教育系统在疫情防控期间面向全国亿万学生开展大规模在线教育是历史上从未有过的创举,在全球也属首次。我们可能正在经历一个全球最大的信息化基础设施升级改造工程和一个师生信息素养提升培训工程,一次全球最大的信息化教学社会实验和一次开放教育资源运动。面对新型冠状病毒疫情防控期间各级各类学校在线教学开展中遇到的各种难题,基于网络研讨会的专家观点和校长、教师和局长对一线在线教育实施情况、困难、经验和建议的分析,本文从超大规模互联网教育组织的视角出发,围绕流畅的通信平台、适切的数字资源、便利的学习工具、多样的学习方式、灵活的教学组织、有效的支持服务、密切的政企校协同七个要素,论述了在线教育如何有效支撑“停课不停学”,以期为政府及各级各类学校制定相关政策方针提供理论依据,为一线教师和学生开展在线教学提供操作指南,为相关企业、家庭、社会等多方参与和支持在线教学提供思路和方法。  相似文献   

Multi-frequency proportional-resonant （MFPR） current controller for PWM VSC under unbalanced supply conditions   总被引：1，自引：0，他引：1  

HU Jia-bing HE Yi-kang 《浙江大学学报(A卷英文版)》2007,8(10):1527-1531

This letter presents a multi-frequency proportional-resonant （MFPR） current controller developed for PWM voltage source converter （VSC） under the unbalanced supply voltage conditions. The delta operator is used in place of the shift operator for the implementation of MFPR by using a low-cost fixed-point DSE The experimental results with an alternative control strategy validated the feasibility of the proposed MFPR current controller for the PWM VSC during voltage unbalance.  相似文献   

Proteomic analysis of human umbilical vein endothelial cells exposed to PM<Subscript>2.5</Subscript>     

Ji Zhu  Lin-wen-si Zhu  Jin-huan Yang  Ying-ling Xu  Cui Wang  Zhuo-yu Li  Wei Mao  De-zhao Lu 《Journal of Zhejiang University. Science. B》2018,19(6):458-470

Exposure to fine ambient particulate matter (PM_2.5) is known to be associated with cardiovascular disease. To uncover the molecular mechanisms involved in cardiovascular toxicity of PM_2.5, we investigated alterations in the protein profile of human umbilical vein endothelial cells (HUVECs) treated with PM_2.5 using two-dimensional electrophoresis in conjunction with mass spectrometry (MS). A total of 31 protein spots were selected as differentially expressed proteins and identified by matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) MS. The results demonstrated that DNA damage and cell apoptosis are important factors contributing to PM_2.5-mediated toxicity in HUVECs. It is further proposed that PM_2.5 can inhibit superoxide dismutase (SOD) activity and increase reactive oxygen species (ROS) and malonaldehyde (MDA) production in a concentration-dependent manner. Induction of apoptosis and DNA damage through oxidative stress pathways may be one of the key toxicological events occurring in HUVECs under PM_2.5 stress. These results indicated that the toxic mechanisms of PM_2.5 on cardiovascular disease are related to endothelial dysfunction.  相似文献   

贵州月亮湖放牧式养殖胭脂鱼营养成分分析     

田超  王秀龙  罗安洪  何小梅  姚俊杰 《铜仁学院学报》2016,(4):5-9

月亮湖是贵州省赤水市的天然水域,通过投入鱼种进行放牧式养殖。为了解月亮湖中放牧式养殖条件下胭脂鱼(Myxocyprinus asiaticus)的营养特点,采用常规营养方法测定了胭脂鱼的营养成分和氨基酸含量。结果显示:胭脂鱼肌肉中水分含量为(69.40±0.29)%,粗蛋白含量为(16.66±0.69)%,粗脂肪含量为(0.76±0.02)%,粗灰分含量为(2.50±0.18)%。共检测到17种氨基酸,其总量为(84.59±2.955)%,其中7种必需氨酸(不含色氨酸)总量为(33.14±1.22)%,占氨基酸总量的39.18%。4种鲜味氨基酸总量为(33.35±1.09)%,占氨基酸总量的39.43%,必需氨基酸与非必需氨基酸的比例为64.41%。研究结果表明放牧式养殖胭脂鱼的肌肉具有水分含量较低,蛋白含量适中,脂肪含量低,灰分含量较高,氨基酸含量适中的特点。  相似文献