DISCUSSION OF CRITICAL LOAD IN NONLINEAR STABILITY ANALYSIS AND SUGGESTION OF VARIATIONAL PRINCIPLE OF SOLVING CRITICAL LOADS

In this paper, a set of variational formulas of solving nonlinear instability critical loads are established from the viewpoint of variational principle. The paper shows that it is very convenient to solve nonlinear instability critical load by using the variational formulas suggested in this paper.

Analysis and Research on the Thermal Environment of Subway Stations in Wuhan

With the rapid advancement of urban construction,urban subway construction in China has entered an advanced development stage and the thermal environment of subway stations has become a key factor affecting passengers'thermal comfort.To further understand the actual situation of the thermal environment of subway stations,field measurement and CFD simulation were carried out on a subway station hall in Wuhan from July to August 2021,and the thermal environment changes and influencing factors during subway operation were compared and analyzed.The present situation of the thermal environment in subway stations was analyzed,and some suggestions and measures for improving the thermal environment were put forward.

高中生物理问题解决中错误类型及成因的实证研究

分析学生物理问题解决过程中的错误类型及成因有助于改进物理问题解决教学、提高学生物理问题解决能力.学生在解决物理问题时主要的错误类型可分为理解性错误、思维性错误和数学性错误3类,运用自制《学生物理错题错因反思单》展开的实证研究表明,学生的主要错因依次为“不理解概念、规律”“运算错误”“不理解题意”“缺乏解题方法”等,且不同分数段的学生错因分布特点不同.因此,教学中要及时了解学情,科学进行学法指导;重视过程,扎实搞好物理概念、规律教学;深度研讨,切实进行审题方法训练;数理结合,灵活培养数理逻辑思维能力.

中日税制结构的比较分析

本文对中日两国的税制结构进行比较分析，找出我国目前税制结构中存在的缺陷和问题，并提出改善的意见和建议。