Experimental and thermal stress investigation on side wall deformation at the pendent convective pass in a utility boiler

An experimental investigation is performed on side wall deformation at the pendant convective pass （PCP） in a 300 MW and a 600 MW utility boiler. The temperature distributions are measured on the side wall areas of the water-cooled wall, the PCP and the horizontal convective pass （HCP） in the two utility boilers. These experiments show that there are great temperature differences in the side wall areas during the startup process in both utility boilers. These temperature differences can reach 80-150 ~C with the side wall temperature in the PCP area higher than those in the water-cooled wall and the HCP. The highest temperature in the PCP is close to the flue gas side temperature at the same position in the horizontal flue gas pass. Thermal stress analyses are conducted in the side wall areas in the water-cooled wall, the PCP and the HCP with the software ANSYS. The results show that, at great temperature differences, the PCP side wall undergoes negative thermal stresses that exceed the yield strength causing deformation in the PCP side wall.     

健康人格:高校教师专业化的理想

高校教师的学科专业化和教育专业化造就了各具特色的专业化教师。专家或专业化教师的本质特征是其独特性或"不可替代性"。每一个高校教师的专业化过程就是其形成独特个性或人格的过程。"人格"理论从"扮演角色"的角度提出了高校教师专业化的社会理想与个性化设计思想。高校教师专业化应该通过宽松的"台前",由高校教师自我实现人格的塑造。     

大学英语写作教学中的纠错反馈研究

文章讨论了大学英语写作教学中有关纠错反馈的理论基础——输入输出假说以及纠错反馈的研究进展。认为教师应重视自己在纠错反馈中的角色,教师应知道纠正什么、何时纠错和如何纠错;还应重视学生在纠错反馈中的角色,了解学生的喜好和愿望,重视和引导学生进行自我纠正和同辈反馈。     

唐蕃关系与唐代鄯州的历史地位

在唐与吐蕃的关系中,唐王朝在今青海东部设置鄯州是青海历史上的重要事件。鄯州由乎特殊的地理位置,凸现出其在唐王朝政治经济体系中的重要地位,这种重要地位不仅在政治关系中发挥了巨大的作用也极大地推动了这一地区的经济开发。     

色彩在现代体育运动中的作用

文章运用文献资料法、对比分析法、专家访谈法,根据色彩学原埋,论述了在体育的教学、训练、比赛中色彩对运动效果的影响,认为颜色与体育运动效果和运动成绩有着密切的关系,应加强色彩运用的深入研究．     

高等学校公共体育教师工作压力与组织承诺关系研究——基于西安市高校的实证分析

运用"组织承诺"有关理论,以西安市普通高等学校公共体育课教师为研究对象,对工作压力与组织承诺之间的关系这一问题进行了研究,建立了公共体育教师的工作压力与组织承诺的关系的模型,通过实证研究发现了公共体育教师工作压力的大小会对其组织信任和对组织公平性的认识有显著正向影响。表明公共体育教师组织信任的提升、公共体育教师对组织公平性的认识的增强有利于公共体育教师组织承诺的增加。     

行政决策听证的理性论辩特征及程序要求——基于商谈理论的视角

重大行政决策的听证主要包括政策类、规划类和项目类听证。它们的共同特征在于,以理性论辩的方式确认体现公共利益的公共目标,以此限制行政决策权的恣意。在听证程序设计中,需将理性论辩的要求渗透到相应的程序规定中,即,有利于广泛参与的程序准入规定;有利于充分论辩的程序权利规定;有利于认真反思的程序角色规定;有利于结论自治的程序终结规定。     

三网融合时期河北省舆论宣传对策探究

随着三网融合的深入开展,开创了一个自媒体时代,媒介环境、新闻样式、传播者角色、受众角色都发生了变化。河北省三网融合时期舆论宣传工作可以从以下四方面入手,通过整合媒介资源,构建良好宣传环境;作为政府应加强引导,应对传播变化;作为媒体应转换角色,提供话语平台;作为公众,应努力提高媒介素养,强化自媒体把关人。     

大学教师的公仆型领导角色研究

"教师成为公仆型领导者"是美国新兴的教育理念。在大学教学中引入公仆型领导理念,符合当前我国大学教育的需要。大学教师应把领导者和服务者的双重身份合而为一,并以服务先行。本项研究结果表明,教师的公仆型领导行为有助于提高学生对课程的满意程度、学习意愿和信心,并有助于提升教师在学生中的声誉。研究结果为在我国大学教育中贯彻公仆型领导理念提供了实证支持。     

Athletic performance and recovery–stress factors in cycling: An ever changing balance

Abstract

We sought to examine whether the relationship between recovery–stress factors and performance would differ at the beginning (Stage 1) and the end (Final Stage) of a multi-stage cycling competition. Sixty-seven cyclists with a mean age of 21.90 years (SD?=?1.60) and extensive international experience participated in the study. The cyclists responded to the Recovery–Stress Questionnaire for Athletes (RESTQ-Sport) and rated their performance (1?=?extremely poor to 10?=?excellent) in respect to the first and last stage. Two step-down multiple regression models were used to estimate the relationship among recovery (nine factors; e.g. Physical Recovery, Sleep Quality) and stress factors (10 factors; e.g. Lack of Energy, Physical Complaints), as assessed by the RESTQ-Sport and in relation to performance. Model 1 pertained to Stage 1, whereas Model 2 used data from the Final Stage. The final Model 1 revealed that Physical Recovery (β?=?.46, p?=?.01), Injury (β?=??.31, p?=?.01) and General Well-being (β?=??.26, p?=?.04) predicted performance in Stage 1 (R²?=?.21). The final Model 2 revealed a different relationship between recovery–stress factors and performance. Specifically, being a climber (β?=?.28, p?=?.01), Conflicts/Pressure (β?=?.33, p?=?.01), and Lack of Energy (β?=??.37, p?=?.01) were associated with performance at the Final Stage (R²?=?.19). Collectively, these results suggest that the relationship among recovery and stress factors changes greatly over a relatively short period of time, and dynamically influences performance in multi-stage competitions.