数学交流,mathematical communication
1)mathematical communication数学交流
1.Research on Interactal Mathematical Communication in Mathematical Teaching and Learning;数学教与学中互动式数学交流的研究
2.An Investigation into the Strategies of Improving Mathematical Communication in High Schools;促进高中课堂中的数学交流的策略研究
3.The Investigation and Cultivation Strategies of Senior High School Students Ability to Mathematical Communication;高中学生数学交流能力的调查及其培养策略
英文短句/例句
1.On Research of Mathematics Communication in Middle School Mathematics Classroom Teaching;中学数学课堂教学中的数学交流研究
2.Research on Interactal Mathematical Communication in Mathematical Teaching and Learning;数学教与学中互动式数学交流的研究
3.A Survey of the Mathematical Communicative Competence of Senior High School Students;高中学生数学交流能力的调查与分析
4.Survey and Analysis of the Mathematics Exchange among Senior One Students;高一学生数学交流现状的调查与分析
5.The Mathematical Exchange between China and Japan in the Last Phase of Qing and the Modernization of the Mathemtical Education of China清末中日数学交流与中国数学教育的现代化
6.An Investigation into Current Situation of Senior Middle School Students Mathematical Communication and Its Improvement;高中生数学交流现状调查及对策研究
7.Mathematical Communications in High Schools: How to Implement the New Curriculum;新课程下对高中“数学交流”的思考
8.The Research on Strategy and Practice of the Junior High School"s Mathematic Communication under the New Curriculum新课程下高中数学交流策略实践研究
9.Construction of MathML and SVG-based Mathematical Communication Platform基于MathML和SVG的数学交流平台构建
10.The Influence of Mathematics Communication on Enriching Function Concept Map of Nomal School Students;数学交流对丰富师范生函数概念图的影响
11.The Investigation and Cultivation Strategies of Senior High School Students Ability to Mathematical Communication;高中学生数学交流能力的调查及其培养策略
12.An Investigation into the Strategies of Improving Mathematical Communication in High Schools;促进高中课堂中的数学交流的策略研究
13.Normal School Students Mathematical Communication Capacity Training;新课程背景下师范生数学交流能力的培养
14.Mathematical Practice: the Mathematics Variation Analysis of Mathematical Classroom Communication;数学实践:数学课堂交流之数学变化分析
15.Strengthen the Communication on Mathematics Education between Chinese and International Communities:Start from Knowing about International Commission on Mathematical Instruction;加强中外数学教育交流——从了解ICMI开始
16.Investigation and Experimental Studies of the Mathematical Intercommunication in the Classrooms of High School;高中数学课堂交流的调查与实验研究
17.Design and Development on the Information Exchange Platform of Shandong Mathematical Society山东数学会信息交流平台设计与开发
18.The Traffic Flow Model Based on Fluid Dynamics and Numerical Simulation;基于流体动力学的交通流模型及数值模拟
相关短句/例句
mathematics communication数学交流
1.This paper expounded the origin ofmathematics communication, and analysed the instructional significance ofmathematics communication that lies in two important aspects in particular.阐述了数学交流的缘起和功能 ,指出除具有一般的教学功能外 ,数学交流的教学意义特别表现在完善数学思维活动和实现数学教学的社会价值两方面 。
2.The importance ofmathematics communication had been accepted and approved by more and more people of the same occupation.数学交流在学生的数学学习中的重要作用已被越来越多的同行所认可,新课程标准强调要提高学生的数学表达和交流能力。
3.In Curriculum and evaluation standards for school mathematics made by NCTM in 1989,mathematics communication is listed as one of the curriculum objectives, besides, achievingmathematics communication is a symbol of possessing mathematical quality.1989年美国全美数学教师理事会(NCTM)在其制定的《美国学校数学课程与评价标准》中明确地把数学交流作为课程目标之一，把学会数学交流作为“有数学素养”的标志。
3)mathematics intercourse数学交流
1.cu ltivating the ability ofmathematics intercourse must through some ways and depe nd on both teacher subject and student subject.数学交流是时代对数学教育和学习提出的新要求 ,数学交流具有重要的理论和实践意义 ,数学交流能力的培养应从观念的更新、教师主体和学生主体两个层面、多个途径进
4)mathematical exchange数学交流
1.Themathematical exchange between China and other countries was comprehensively restored with the return of the order of education and science to normal at the beginning of the preiod of reform and opening up.在改革开放的新时期,中外数学交流最初在教育科研秩序的回归正轨中得到全面恢复。
5)mathematical exchange consciousness数学交流意识
6)mathematics in USSR中苏数学交流
延伸阅读
交流-交流直接变频调速交流-交流直接变频调速variable frequency AC motor speed control by direct AC-AC converterJ一Qoi一u一J一oollu zh一J旧blonP一nt一oosu交流一交流直接变频调速(variable frequeney给定值相对应的三相基准电压。再经过比较器形成触发晶闸管的触发角，并产生触发脉冲，经放大后触发晶闸管。由于交流一交流变频器中，交流输人侧会产生很大的无功功率，从而降低电源设备利用率;交流输人侧存在着高次谐波电流，将使电源电压的波形发生畸变.如要降低无功功率，可采用中点偏压法、环流控制法、级联法等控制方法。如要降低高次谐波，可采用输出电流波形控制法、两台交流一交流变频器谐调运行等。近来，价格低廉、性能良好的微机控制电路已经产生，从而简化了电路、提高了控制性能。应用交流一交流变频器为一级(直接)换能，效率可高达90%以上;其换流为电源自然换流，不需要辅助换流电路，简化了主电路;直接变频容易实现四象限运行。但由于交流一交流变频器中晶闸管是靠电网电压进行换流，变频器最高输出频率不超过电网频率的1/2~1/3，否则，输出波形将发生严重的畸变和不对称。因此，这种变频调速适于低速大容量的电动机负载，如球磨机、矿井提升机、轧钢机、卷扬机、风洞等传动;或者将中频变为较低频率供电给电动机进行调速，如电动车辆上将I000H:中频发电机的电能转变为400H:以下的电能供给电动机进行调速。如果交流一交流变频器所带负载是容性的，例如在无换向器电动机中，电流超前于电压，或者采用其他措施进行强迫换流，使晶闸管能及时关断，则交流一交流变频器的输出频率将不受限制，甚至可以做到输出颇率高于电源频率，从而可能实现对高速电动机进行调速。AC motor speed eontrol by direet AC一AC eon-verter)采用交流一交流直接变频器实现交流电动机调速的技术。交流电动机的极对数一定时，其同步转速与供电电源频率成正比，改变频率就能调节电机的转速(见变频调速)。交流一交流变频器就是直接将恒压恒频的交流电通过电力变流器变换为变压变频的交流电源，供电给交流电动机进行调速。常用的交流一交流直接变频调速的线路如图1所示，图l(a)为三相零式线路，图1(b)为三相桥式线路，均采用三组晶闸管反并联可逆变流装置构成三相输出。
