带电粒子在均匀电磁场中运动的普遍规律

本文通过适当选择坐标系，导出了非相对论情况下带电粒子在均匀电磁场中运动的普遍规律。由此推出的某些特殊情况下带电粒子的运动规律与有关文献给出的结果是一致的。     

Numerical simulation of bubble chaotic motion in a cavitating water jet

~~00002RKRSr= (6) If 0tKt=, Eqs. (2),(3) and (4) change into the following equation that is applied to simulations using the MathCAD software. ddd(,,)dd1dxyygxyzzttt=== (7) where 11251(,,)()(1)gxyzABCyxaaaa=++-+, 2132131145678222124531678831(1),23(1)[(1sin],[3cos()] AyyByxxyxzCxyxyxyxzggaaaaaaaaaaaaagaaaa-------=--=++---+=+-- (8) 5g00pK6g0p…     

Investigating Greek Students' Ideas about Forces and Motion

Educational research has shown that high school and university students also follow the Aristotelian idea about motion; for example, a continuous action of a force is necessary to keep an object in motion. The survey presented in this article aims at a deeper investigation of secondary education students' ideas about the forces involved in objects moving under the sole influence of gravity. The main objectives are: (1) to investigate other ideas or difficulties, which intervene and determine students' mental models about motion and force, and (2) to reveal how the students in the sample are grouped according to their alternative conceptions. Our study has been mainly determined by the revision in Science Curriculum established in Greece three years ago. A survey has been administered to a total of 146 students (15–16 years old) attending six typical public high schools in Greece. The results presented show that the traditional instruction is pertinent while the approaches of the New Physics Curriculum have not been effectively expanded to the schools. The majority of the students exhibited the idea that the original force is continuously exerted to the ball during its motion. On the other hand, multivariate analysis has identified three discernible groups of students which have exhibited a persistent and rather consistent approach: (1) An extended group of students having the above misconception, (2) a second group of students which, generally, responded correctly to the tasks, and (3) a third group of students, which ignored the presence of the gravitational force and/or believe that the action-reaction forces are both exerted to the ball during its motion.     

中国大学生职业成熟度量表的信度与效度

本研究调查了375名北京大学的本科生，尝试修订韩国版的学生职业成熟度量表（Career Maturity Inventory），探讨它针对中国大学生群体的适应性。结果表明：（1）修订后的中国版大学生职业成熟度量表具有一定的文化特点，它由34个项目构成，这些项目组成六个不同的因素——职业目标、职业自信、职业价值、职业自主、亲友依赖、职业参照；（2）该量表的一致性系数、分半信度、重测信度比较高，具有良好的信度；（3）该量表具有较好的效度，如职业成熟度得分与大学生的自尊、幸福感、内控分呈显著的正相关；职业成熟度与专业满意度、未来打算的确定性、职业选择的信心等呈显著的正相关；职业成熟度越高的大学生上网时间越少，而且即使上网也主要用于辅助学业或便利生活。     

双曲抛物面与平面束截迹的研究

对双曲抛物面与各种位置平面束的截交线所形成的图形作了详细的论述.揭示了双曲抛物面图形中隐含的特性,拓宽了二次曲面所研究的内容.*     

带有运动附件的航天器混沌姿态运动

研究自旋航天器处于无力矩状态，运动附件作为摄动项对其姿态的影响．利用Melnikov方法预测航天器受微小扰动存在混沌运动。并在高维空间进行数值模拟验证此结论的正确性．     

基于三维软件的《机械设计基础》课程改革与资源开发

针对高职院校《机械设计基础》课程传统教学方法的弊端,文章分析了课程内容与知识特点,提出基于三维软件应用的课程项目化教学设计与课程资源开发模式,对机械类专业基础课程的项目化教学改革与资源开发具有一定的参考价值。     

相对运动与参考系的选择

在解决运动学问题中,选择适当的参考系会收到事半功倍之效.     

匀速圆周运动的归类导析

圆周运动按运动物体所受力的种类,可分为:1.在万有引力作用下的匀速圆周运动,2.在电场中的匀速圆周运动,3.在磁场中的匀速圆周运动,4.在复合场中的圆周运动。文章以近年高考题为例对此进行讨论。     

动点和动系的选取原则和方法

正确恰当地选取动点和动系是研究点的合成运动的关键.介绍了选取动点和动系的一般原则,把点的合成运动做了分类,同时给出了动点和动系的选取方法.