阅读,是英语学习中不可缺少的重要手段之一。切实搞好阅读有助于扩大词汇量,丰富语言知识,提高运用语言的能力。阅读的目的是理解和吸收书面的信息,而阅读的速度和理解的准确性则能反映出一个人的阅读能力。在英语教学中我发现学生的英...阅读,是英语学习中不可缺少的重要手段之一。切实搞好阅读有助于扩大词汇量,丰富语言知识,提高运用语言的能力。阅读的目的是理解和吸收书面的信息,而阅读的速度和理解的准确性则能反映出一个人的阅读能力。在英语教学中我发现学生的英语速读能力较弱。他们过于偏重英语语言知识的学习而忽视阅读能力的培养。看文章时总喜欢逐字逐句地阅读,注意力过多集中在句子的语法和结构上。碰到生词舍不得丢开,非要查阅词典不可,似乎看文章就是为了学习句型和掌握新的单词等,否则就会感到没有收获,浪费时间。这种精读式的学习方法固然有可取的一面,但决非学习英语的唯一方法。英国哲学家培根说:“Some books are tobe tasted,others to be swallowed,and some few to be chewed and digested.”意思是说,有些书浅尝即可,另一些书要大口吞下,而少数则必需细细咀嚼和消化。展开更多
Three types of expression in the dark-soliton perturbation theory based on squared Jost solutions are invesgigaged in ghis paper. It is shown that there are three formally different results about the effects of pertur...Three types of expression in the dark-soliton perturbation theory based on squared Jost solutions are invesgigaged in ghis paper. It is shown that there are three formally different results about the effects of perturbagion on a dark soliton, and it is proved by means of a transformation between two integral variables that they are essentially equivalent.展开更多
A parallel hybrid linear solver based on the Schur complement method has the potential to balance the robustness of direct solvers with the efficiency of preconditioned iterative solvers.However,when solving large-sca...A parallel hybrid linear solver based on the Schur complement method has the potential to balance the robustness of direct solvers with the efficiency of preconditioned iterative solvers.However,when solving large-scale highly-indefinite linear systems,this hybrid solver often suffers from either slow convergence or large memory requirements to solve the Schur complement systems.To overcome this challenge,we in this paper discuss techniques to preprocess the Schur complement systems in parallel. Numerical results of solving large-scale highly-indefinite linear systems from various applications demonstrate that these techniques improve the reliability and performance of the hybrid solver and enable efficient solutions of these linear systems on hundreds of processors,which was previously infeasible using existing state-of-the-art solvers.展开更多
文摘阅读,是英语学习中不可缺少的重要手段之一。切实搞好阅读有助于扩大词汇量,丰富语言知识,提高运用语言的能力。阅读的目的是理解和吸收书面的信息,而阅读的速度和理解的准确性则能反映出一个人的阅读能力。在英语教学中我发现学生的英语速读能力较弱。他们过于偏重英语语言知识的学习而忽视阅读能力的培养。看文章时总喜欢逐字逐句地阅读,注意力过多集中在句子的语法和结构上。碰到生词舍不得丢开,非要查阅词典不可,似乎看文章就是为了学习句型和掌握新的单词等,否则就会感到没有收获,浪费时间。这种精读式的学习方法固然有可取的一面,但决非学习英语的唯一方法。英国哲学家培根说:“Some books are tobe tasted,others to be swallowed,and some few to be chewed and digested.”意思是说,有些书浅尝即可,另一些书要大口吞下,而少数则必需细细咀嚼和消化。
基金The project supported by National Natural Science Foundation of China under Grant No. 10375022 and the Scientific Research Fund of the Education Department of Hunan Province of China under Grant No. 05C414
文摘Three types of expression in the dark-soliton perturbation theory based on squared Jost solutions are invesgigaged in ghis paper. It is shown that there are three formally different results about the effects of perturbagion on a dark soliton, and it is proved by means of a transformation between two integral variables that they are essentially equivalent.
基金supported in part by the Director,Office of Science,Office of Advanced Scientific Computing Research,of the U.S.Department of Energy under Contract No.DE-AC02-05CH11231.
文摘A parallel hybrid linear solver based on the Schur complement method has the potential to balance the robustness of direct solvers with the efficiency of preconditioned iterative solvers.However,when solving large-scale highly-indefinite linear systems,this hybrid solver often suffers from either slow convergence or large memory requirements to solve the Schur complement systems.To overcome this challenge,we in this paper discuss techniques to preprocess the Schur complement systems in parallel. Numerical results of solving large-scale highly-indefinite linear systems from various applications demonstrate that these techniques improve the reliability and performance of the hybrid solver and enable efficient solutions of these linear systems on hundreds of processors,which was previously infeasible using existing state-of-the-art solvers.
