大学物理实验教改浅谈

本文结合教学实践．对大学物理实验的教改进行了论述，认为在教学改革过程中，注重学生基本技能，培养兴趣，以及物理实验与各专业相结合的必要性，并着重介绍了在教学改革中的成功经验。     

新工科背景下湖南大学应用化学专业的改革与建设

It is necessary to develop new engineering-directed applied chemistry major on the basis of chemistry major and to remodel the current applied chemistry education according to the concept of emerging engineering. Herein, emendation in 2020 version of applied chemistry education plan and researches on teaching renovations for applied chemistry major in Hunan University is introduced. Through the adjustments of education goals, course systems, teaching contents and teaching models, we wish to highlight the central status of the educations that integrates morality and ability. In addition to the inheritance of the specialty in corrosion and protection, it is expected to further satisfy the need of graduates for the industries such as new materials, new energy, high-tech production, environmental protection, and new generation of information technique. At last, future trends and perspectives in emerging engineering applied chemistry is proposed.     

Existence of optimal strategies in Markov games with incomplete information

The existence of a value and optimal strategies is proved for the class of two-person repeated games where the state follows a Markov chain independently of players’ actions and at the beginning of each stage only Player 1 is informed about the state. The results apply to the case of standard signaling where players’ stage actions are observable, as well as to the model with general signals provided that Player 1 has a nonrevealing repeated game strategy. The proofs reduce the analysis of these repeated games to that of classical repeated games with incomplete information on one side. This research was supported in part by Israeli Science Foundation grants 382/98, 263/03, and 1123/06, and by the Zvi Hermann Shapira Research Fund.     

Building bridges within mathematics education: Teaching, research, and instructional design

Within mathematics education, classroom teachers, educational researchers, and instructional designers share the common goals of understanding and improving the teaching and learning of mathematics. Teachers work to help students learn; researchers study how people learn and teach mathematics; and designers develop instructional materials to support teachers and students. Each community (of teachers, of researchers, and of designers) develops its own perspectives, methods, and expertise. Too seldom, however, do practitioners have the opportunity to share their knowledge across communities. This first-person, retrospective case study speaks to the challenges and rewards of building bridges among these three communities by charting the evolution of an instructional activity (using graphing software to explore slope) through four cycles of teaching, research, and design. Initially separate, the three perspectives of teacher, researcher, and designer begin to interact as the worksite moves from the university laboratory to the author's classroom and then to other teachers’ classrooms. Many of these interactions are fruitful, resulting in new insights and strategies that strengthen the final product and inform the practitioner. At the same time, some tensions arise, particularly between teaching and research, highlighting fundamental differences between these fields. Lessons from this case study suggest implications for collaborations among teachers, researchers, and designers.     

脉冲微分方程的两度量实用稳定性

利用向量Lyapunov函数,研究了脉冲微分方程的两度量实用稳定性问题,通过实例对得到的稳定性的结论给予了验证.     

SOME PROBLEMS AND THEIR SOLUTIONS IN MECHANICS EDUCATION

当前,力学教育迫切需要加强学生的基础科学素养,提升创新能力。虽然我国力学教育界对此已有共识,但在实践中仍有若干尚待解决的问题。本文基于人才成长规律、认知学习规律、实践创新规律,对课程体系优化、力学教材建设、实践创新拓展等三个问题进行分析,提出若干思考和建议。部分建议已经过实践,可望作为解决问题的方案。     

Production and properties of polyacenaphthylene

Summary To produce standards for GPC calibration, oligomers of polyacenaphthylene were fractionated by the method of repeated sample injection in an analytical GPC unit (-styragel-columns, eluent THF). It is possible to separate about 2 g polymers in 24 hours into fractions with good uniformity.First communication: Jürgen Springer, Tin Win, Die Darstellung von Oligoacenaphthylenen mit funktionellen Endgruppen, Makromol. Chem.179, 29 (1978).     

Effect of Age, Gender, and Repeated Measures on Intraoral Air Pressure in Normal Adults

The effect of age, gender, and repeated measures on intraoral air pressure (P0) was examined. Sixty adults comprised of 10 males and 10 females in each of three age groups (i.e., 20-39, 40-59, and 60-83 years) participated. P0 was assessed during voiceless stop plosive /p/ productions in repeated vowel/consonant syllables. The three medial plosives of a seven-syllable train were averaged to comprise a token. Five tokens were obtained and averaged for each of three trials. Thus each participant contributed 105 syllables and a subsequent three P0s for analyses. There was no statistically significant difference in P0 as a function of age or gender (P > 0.05). These findings support the conception that P0 remains stable throughout adulthood and is not dependent on gender. Differences in repeated measures of P0 attained statistical significance (P = 0.03), however the mean differences between trials (0.23 cm H20) were negligible and deemed to be clinically insignificant. Thus, across a short sampling session, P0 is a relatively stable measurement and does not change as a function of age or gender.     

三本高等数学教学方法的探索和实践

针对三类本科高等数学教学质量难以提高的困难,结合作者长期从事三本高数教学的经验,分析了三本高等数学教学的几个制约因素,探索了三本高等数学教学实践中可行的新方法,给出了相关实施建议.