【摘 要】
：
Don trained many Ph.D.students over the～5 decades of his career,at least 45 were advised or co-advised according to a Caltech account.A large number were international students including a high percentage of Chinese students.The contributors to this artic
【机 构】
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Institute of Theoretical and Applied Geophysics,School of Earth and Space Sciences,Peking University
论文部分内容阅读
Don trained many Ph.D.students over the～5 decades of his career,at least 45 were advised or co-advised according to a Caltech account.A large number were international students including a high percentage of Chinese students.The contributors to this article graduated over a time span of 26 years,and we are now distributed in 6 countries across 14 time zones,yet we represent only a small fraction of his former students and postdocs.
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习作是语文课程的重要组成部分,习作水平的高低是语文核心素养水平的重要体现.《义务教育语文课程标准》明确指出:“写作教学应让学生易于动笔,乐于表达;写作教学应抓住取材、立意、构思、起草、加工等环节,指导学生在实践中学会写作;应重视引导学生在自我修改和相互修改中提高写作能力.”如何让学生乐于写作、积极参与写作实践,掌握修改习作的方法,提高习作水平,笔者认为恰当使用评价策略不仅可以激发学生的写作兴趣,而且可以有效指导学生修改习作,达到提高习作水平的目的.
课堂是教学的“主阵地”,课堂中的重点、难点就是这阵地中的“堡垒”,攻克“堡垒”的方法是教学成功的关键.选择恰当的方法突破重难点,可以使学生更容易理解与掌握知识,学生的思维会更活跃,课堂会令人眼前一亮.
在初中体育课堂教学中需要落实生本教学理念,根据学生的学习兴趣设计教学环节是体现生本理念及提升体育有效性的重要途径.因此,教师一定要认识到明确学生兴趣因素的重要意义.本文从学生自身因素、教师教学因素及家长因素三个方面对影响学生兴趣的内因与外因进行了分析,希望能给初中体育教学有益启示与参考.
When I received the shocking news on August 13,2020 that our beloved Don passed away,I was deeply saddened.The feeling was worsened by the COVID-19 pandemic that essentially locked down everything so most of us were not able to attend his memorial ceremon
It has been more than a year since Don left us.He left us so suddenly.We planned to have a phone call after he settled down at his new house.However,it never happened.Although he had some medical issues persi-stently in his last year,he had been so dedica
It has been more than a year since Don passed away suddenly.Thinking about it still makes my heart hurt.I did not know Don Helmberger or any other famous geophysicists before joining the Seismological Laboratory at Caltech in 1989.In fact,I had barely hea
Seismic waveform modeling is one of the most powerful tools for understanding Earth\'s structure,since it allows waveforms to be quantitatively predicted using physical source representations and a velocity model.In the late 1960s,Don Helmberger develop
My first exposure to Don Helmberger\'s work was during a seismology class in my 2nd year in college where several students,including myself,were to present on Grand and Helmberger(1984).It was over my head,but seeing the beauty of the seismograms,tracki