Intellect and selection

Trainee teachers' ideas about links between vehicle emissions and global environmental issues were studied using a 'graphic' questionnaire. Most respondents understood that cars contribute to global warming; two thirds identified carbon dioxide as being responsible. Half thought that heat from car exhausts causes the greenhouse effect. Two thirds realised that cars contribute to Acid Rain, but the unorthodox idea that carbon dioxide was culpable was predominant. Two thirds of the students thought, erroneously, that cars damage the ozone layer. It is suggested that students' thinking is over-generalised, and that misinterpretation of diagrams, errors in logic and non-specific language may contribute to their misperceptions. There is a possibility that misconceptions about this issue will be perpetuated in the classroom. Although there may not be room in students' curricula for more teaching about environmental issues, the environmental impact of cars could provide metaphors to illustrate general principles of learning and teaching.     

语义选择与成份选择研究

语义选择与成份选择是两种重要而基本的句法依赖.每个句子都有特定的构成成份,而这在很大程度上是由语义选择与成份选择决定的.     

钢筋混凝士构件裂缝产生的原因及处理

钢筋混凝土构件产生裂缝的主要原因有设计有误、原材料不符合要求、施工质量不达标、养护不当等．根据建筑工程设计、施工技术原理和施工经验。钢筋混凝土构件裂缝处理方法主要有表面处理法、注入法、充填法、钢锚栓法等．     

Toy safety and selection

Toys can be used to promote children's cognitive, physical, motor, language, social, and emotional development. Safety and developmental appropriateness are of the utmost importance when selecting children's toys. Parents and teachers and other helping professionals need to teach children the safe use of toys to prevent toy-related accidents. Obtain additional information regarding toy safety by calling the U.S. Consumer Product Safety Commission at 1(800)638-CPSC.     

钢筋混凝土楼面裂缝的分析和控制

钢筋混凝土楼面的裂缝控制问题一直是建筑工程中很重要的问题之一。尤其是现在普遍采用泵送商品混凝土进行浇筑，裂缝的控制更加困难了。在经过大量的设计实践和现场实践研究的基础上，分析了裂缝产生的原因，从设计和施工的角度提出了加强、改善、保护等综合技术措施。     

钢筋混凝土桥梁的耐久性分析

对我国桥梁耐久性现状进行总结,分析了钢筋混凝土桥梁失效的主要模式,指出桥梁防水失效是导致桥梁病害发生的最直接诱因,提出设计要贯彻整体性防水的理念,重视结构的细部防水,从选材、设计与施工、维护各个环节着手来提高钢筋混凝土桥梁的耐久性.     

钢纤维混凝土的性能及应用

钢纤维混凝土具有优良的抗拉、抗弯、抗剪、阻裂、耐疲劳、高韧性等性能，在建筑、路桥、水利等工程领域应用广泛。     

钢筋混凝土桥梁的耐久性分析

对我国桥梁耐久性现状进行总结,分析了钢筋混凝土桥梁失效的主要模式,指出桥梁防水失效是导致桥梁病害发生的最直接诱因,提出设计要贯彻整体性防水的理念,重视结构的细部防水,从选材、设计与施工、维护各个环节着手来提高钢筋混凝土桥梁的耐久性。     

社会流动与教育选择

There is a close interactive relationship between social mobility and educational selection. On one side, the character, direction, speed, level, methods and trends of social mobility affect the aims, goals, functions, scope, strategy, content and methods of choice in education. On the other side, the goals, basis and means of choosing education promote inter-generational social mobility, competitive mobility and structural optimization. In recent years, social mobility and educational selection are increasingly coming into contact in China, but there are still a lot of mutual constraints. In order to promote a coordinated operation and positive interaction between them, society should strive to create a stable democratic political environment, sustained and balanced economic growth, and an open and orderly employment system. Moreover, we need to open up the education system, balance the allocation of resources, strengthen the function of choice and enable education to play a more value-oriented role.     

Stimulus variation and dimensional contrast

In two experiments, a maintained generalization procedure was employed to examine stimulus control of pigeons’ responses to a visual wavelength continuum. For both experiments, pigeons’ responses were periodically reinforced during wavelength values from one end of a continuum, while responses during other stimulus values were extinguished. In Experiment 1, the set of positive stimulus values remained constant, while the spacing of the set of negative stimuli varied. In Experiment 2, the set of negative stimulus values remained constant, while the spacing of positive stimuli varied. Positive dimensional contrast effects were obtained in both experiments. In general, the results indicated that variation in the spacing of negative stimuli had little effect on positive dimensional contrast. However, variation in the spacing of positive stimuli produced changes in the peak of the dimensional contrast gradient, without apparent change in the magnitude of the effect.     

纤维混凝土的研究及应用

针对普通混凝土中存在的问题,提出采用复合化的方式解决这些问题,并讨论了纤维在混凝土中的作用问题。     

思想政治课教学应加强情感教育

思想政治教学中的情感因素具有两极性、情境性、感染性和迁移性的特征；情感教育具有信号作用、动力作用及协调人际关系的作用；加强思想政治课情感教育要采取的原则和方法有：坚持激发和培育中学生积极情感的原则；发挥政治课教师在情感教育中的特殊作用；开展生动活泼的教学活动，促进学生情感的发展。     

加筋水泥土锚桩支护构造与施工研究

加筋水泥土门字型锚桩支护结构具有很好的基坑坑壁变形控制能力、结构的整体稳定性。文章研究了加筋水泥土门字型锚桩支护结构的构造组成、工法及施工过程,对深基坑支护研究具有重要参考价值。     

软土固化增强复合外掺料研究

采用水泥、外加剂和复合外掺料对温州软土进行固化试验，研究结果表明，在水泥中掺适当的工业废料及外加剂做加固土的固化剂，不仅较显地增加加固土的强度，而且可以节约工程造价．本从试验及机理两方面对此作了探讨．     

钢筋混凝土梁的合理纵向配筋率

钢筋混凝土受弯构件纵向配筋率ρ的取值，现行混凝土设计规范(GB50010—2002)允许的范围是比较大的，然而在实际工程中，钢筋混凝土受弯构件内纵向配筋率ρ的大小对建筑工程质量、耐久性、经济性等方面都有很大影响。该文仅从有屈服点钢筋在钢筋混凝土梁内纵向配筋率入手，通过理论分析、经济比较，研究确定钢筋混凝土受弯构件-梁的合理纵向配筋率。     

钢筋混凝土楼面裂缝的成因与防治措施

钢筋混凝土楼板因其造价较低、整体性好,在现代建筑中被大量使用。现浇板裂缝是妨碍钢筋混凝土楼面发展的重要因素。混凝土楼面裂缝形成的原因多种多样,主要有材料、施工、设计等方面的因素。在目前的施工技术条件下,只有对参与建设的各个环节加以控制,才能减少裂缝的产生。     

水泥混凝土路面常见危害与防治对策

通过实际调查,总结施工经验,分析了混凝土路面错台、裂缝、断裂等方面常见病害及产生病害的原因。从设计和构造及材料选择、施工及养护、水泥混凝土路面运营养护与维修等方面提出了防治与维修的对策。