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green hand
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     With the constant development of society,it has become a common tendency in education in the world to cultivate expert teachers. The article begins with researching of the expert teachers and green hand teachers,inquired into the essential differences of them. It attains to the purpose of analyzing the four basic features,automation,dealing with the basic teaching issue,knowledge construction,high-level self-efficacy and self-domination by considering the expert teachers themselves.
     随着社会的不断发展,培养专家型教师已成为世界教育发展的共同趋势,文章从专家型与新手型教师的研究入手,探讨两者的本质差异,通过对专家型教师的主动反思、对基本教学问题的处理达到自动化、知识结构化、高水平的自我效能感与自我监控能力等四个基本特征的分析,阐述了其对教师成长与发展的启示。
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     Green
     “青”春野绿
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     Green
     绿色情思
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     Hand.
     Hand.
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     Hand.
     Hand .
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     Hand in Hand to Create Green China Ministers Plant Trees in Beijing
     共建绿色中国 百名部长植树北京
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Up to present, the design method for TWT is still those founded in the fifties and sixties of this century. In designing the TWT, it usually starts from selecting the value of γa in the range of 1.2-1.6, then calculates the related internal working parameters and the dimensions of the tube until the performances of the tube are satisfied. In such kind of design method, it can not bring the internal working parameters and the dimensions of the TWT in the suitable working region in the first run calculation. It...

Up to present, the design method for TWT is still those founded in the fifties and sixties of this century. In designing the TWT, it usually starts from selecting the value of γa in the range of 1.2-1.6, then calculates the related internal working parameters and the dimensions of the tube until the performances of the tube are satisfied. In such kind of design method, it can not bring the internal working parameters and the dimensions of the TWT in the suitable working region in the first run calculation. It needs the way of cut and try, and has some blindness in mind for a green hand designer.In this paper it gives out a new procedure in the design method. In this new design procedure, it starts from the small signal gain parameter working region diagram(2), selecting a suitable working region, setting out a working point at the center of the frequency band and obtain the working point value of b, QC and x1, and then calculating the dynamic working curve of the whole frequency band. From this dynamic working curve, we can see clearly on the region diagram whether the working region fixed is satisfied or not. And on this region diagram, we can judge whether there is any possibility of performance improvements of the TWT, and if necessary, see how to move the working point to a better region. Such kind of selection and fixing on the region diagram method makes the designer's mind clear and avoids blindness.This new procedure can be used for design of small signal gain TWT, of high efficiency and high power tube, and of super wide band TWT.

本文提出一个行波管设计的新步骤。从行波管小信号增益参数工作区域图着手,在图上首先选择合宜的工作区域和定出中心频率下的工作点,然后求出整个频带范围的动态工作曲线。这样就可在图上明显地看出所选行波管内部工作参数的情况是否合宜,并明确了为进一步提高管子性能是否还有潜力或应向什么方向移动工作点。这种按图索骥的步骤既可使心中有数,也避免了盲目性。该设计步骤不论是对小信号增益行波管或高效率行波管或是超宽频带行波管均适用。

With the constant development of society,it has become a common tendency in education in the world to cultivate expert teachers.The article begins with researching of the expert teachers and green hand teachers,inquired into the essential differences of them.It attains to the purpose of analyzing the four basic features,automation,dealing with the basic teaching issue,knowledge construction,high-level self-efficacy and self-domination by considering the expert teachers themselves.At the same time,it expounds...

With the constant development of society,it has become a common tendency in education in the world to cultivate expert teachers.The article begins with researching of the expert teachers and green hand teachers,inquired into the essential differences of them.It attains to the purpose of analyzing the four basic features,automation,dealing with the basic teaching issue,knowledge construction,high-level self-efficacy and self-domination by considering the expert teachers themselves.At the same time,it expounds the enlightenment that acts on the growing and developing of the teachers.

随着社会的不断发展,培养专家型教师已成为世界教育发展的共同趋势,文章从专家型与新手型教师的研究入手,探讨两者的本质差异,通过对专家型教师的主动反思、对基本教学问题的处理达到自动化、知识结构化、高水平的自我效能感与自我监控能力等四个基本特征的分析,阐述了其对教师成长与发展的启示。

Expert knowledge was a hot topic researched in the new learning science. Experts could discern the informational characters that green hand could not pay attention to. Experts made up their own knowledge according to core concepts and big ideas. Experts could draw conditional information swimmingly in their knowledge storehouse. It produced instructional adaptability that expert knowledge was thoroughly acquainted with knowledge of education and teaching. The characteristics of expert knowledge offered...

Expert knowledge was a hot topic researched in the new learning science. Experts could discern the informational characters that green hand could not pay attention to. Experts made up their own knowledge according to core concepts and big ideas. Experts could draw conditional information swimmingly in their knowledge storehouse. It produced instructional adaptability that expert knowledge was thoroughly acquainted with knowledge of education and teaching. The characteristics of expert knowledge offered beneficial enlightenment to mathematics teaching which could improve students’ pattern-recognition, knowledge organization, recollect swimmingly and meta-cognition controlling.

专家知识是新的学习科学所重点研究的问题,专家能够识别新手注意不到的信息特征,专家按照核心概念和大观点组织知识,专家能够顺畅提取知识库中条件化信息,以及与教育教学知识融会贯通而具有教学的适应性.专家知识的特征为数学教学提供了改善学生模式识别、知识组织、顺畅提取和元认知监控的有益启示.

 
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