金浩茶油密召事件引发对完善我国食品召回制度的思考

金浩荼油密召事件使一起质量个案演化成了一场公众信用危机.本文从食品召回的现状与不足着手,结合我国有关食品召回的最新立法,对我国食品召回制度提出了一些完善建议.     

煤矿安全技术培训工作的着眼点

煤矿生产主要是井下作业。由于作业场所受地质条件和气候的影响,并且有顶板、水、火、瓦斯、煤尘等自然灾害威胁等特殊性,因此,煤矿员工都必须进行安全技术培训,以适应煤矿生产的局限性和特殊性。 煤炭企业的领导要树立"科学技术是第一生产力"的观念。煤矿安全生产在市场经济条件下也应引入竞争机制,强调安全就是最大效益,切实把煤矿安全技术培训提到重要的议事日程上来,并把煤炭企业领导是否重视员工安全技术培训作为考核和任免领导的条件之一。     

次氯酸钠化学品的研究及应用

对次氯酸钠的制备、化学品性状、重要无机化学反应以及在水处理等方面的应用进行了综述。     

功利道德和情感道德的劝善——18世纪英国感伤主义小说的文学伦理学批评

在18世纪经济迅猛发展的英国,对物质的过度追求影响到社会伦理道德体系的构建,感伤主义思潮随之出现。感伤主义文学注重人物内心情感的刻画,作家理查生和斯特恩深受当时诸多哲学家、伦理学家道德伦理观念的影响,在其代表作中或树立伦理道德典范,或剖析传递伦理道德观,劝善读者,成就了现代小说的经典之作。     

Skills for Independence for Children with Cerebral Palsy: a comparative longitudinal study

Thirty‐six children with cerebral palsy, aged 3.5 to 4.5 years were compared on their skills for independence. Of the 36 boys and girls, 19 children were enrolled in a Conductive Education Program in Birmingham and 17 were enrolled in British special education programs in the Greater Manchester area. Skills for independence were measured with the Vineland Adaptive Behavior Scales via teachers’ responses, once a year on three occasions. Parents were interviewed using the Developmental Profile 2, once a year on three occasions. The results of two‐way ANOVA with one repeated measure on both teachers’ and parents’ responses indicate that there was no significant difference between the two groups in their skills for independence. However, both groups performed significantly better as they were getting older. Despite the strong emphasis on independence in Conductive Education, the children's level of independence was no different from their counterparts. Thus, the claim for the effectiveness of Conductive Education is not supported by the study.     

Simple Preparation of Spherical Activated Carbon with Mesoporous Structure from Phenolic Resol and Associated Catalytic Performance in Isobutane Dehydrogenation

This study provides a detailed report on the synthesis of spherical activated carbon with mesoporous structure using a soluble low molecular weight phenolic resol precursor through an ammonium alginate assisted sol–gel method. The effects of calcinating temperature and the addition of CaCO_3 as a pore-enlarging agent on texture structure and catalytic performance in isobutane dehydrogenation to isobutene were investigated. Characterization of N_2 sorption,mechanical strength tests,and optical photographs confirmed that the obtained carbon materials had high mechanical strength,a good degree of sphericity,and a large surface area. Introducing CaCO_3 as a pore-enlarging agent during the preparation process promoted the formation of a mesoporous structure of carbon spheres and evidently increased the surface area and oxygen content,which can improve isobutane conversion and isobutene selectivity of these carbon spheres. The conversion of isobutane reached up to 28% for this spherical activated carbon,and the selectivity of isobutene reached up to 96%. Isobutane conversion increased with an increase in calcination temperature due to an increase in the oxygen content,whereas the selectivity of isobutene decreased due to the slight decrease in the specific surface area.     

Learning science through technological design

In the course of a decade of research on learning in technology‐centered classrooms, my research group has gained considerable understanding of why and how students learn science by designing technology. In this article I briefly review two dimensions in which science and technology share fundamental similarities: (a) the production and transformation of representations and (b∥ the action‐oriented language describing the two domains. Because it is fundamentally problematic to derive what ought to happen in science classrooms from other dimensions, I provide three episodes to illustrate what and how students know and learn science during technological design activities. Episodes and analyses embody the two dimensions previously outlined. Because these episodes are representative of the database established during an extensive research program, I suggest there is sufficient ground for using and investigating science‐through‐technology curricula. © 2001 John Wiley & Sons, Inc. J Res Sci Teach 38: 768–790, 2001     

Why Do We Want to Change Teachers’ Beliefs and How Could We Support These Changes? The Case of Conceptions of Learning

The theoretical part of this paper argues for an embedding of the question of stability and change of teachers’ conceptions of learning into the researchers epistemological standpoint. The empirical part illustrates this statement by showing how changes in a teacher's conception of learning could be understood from a constructivist perspective. According to this perspective, conceptions are related to other relational and environmental variables that form a meaningful configuration. Thus, although conceptions of learning appear as relatively stable cognitive structures, they are also related to environmental variables to be managed by the teachers’ educators. This research result determines the discussion of the basic questions addressed in the title of this paper: why do we want to change teachers beliefs and how could we, as teachers’ educators, support these changes.     

论员工职业生涯及其管理

员工职业生涯的管理是任何一个组织用人、育人、留人的重要措施。组织应更新员工管理的观念，在人本管理的指导思想下，明确职业对人的意义和影响职业生涯的因素，并进一步了解不同年龄阶段与职业决策之间的关系，为员工的职业生涯承担一定的职责，使员工与组织的目标一致，在为组织贡献的过程中实现自己的职业生涯目标，达到组织与员工个人双赢。     

对农村居民医疗保障问题的思考

农村居民的医疗保障存在不少问题 ,应采取必要的一些政策性措施 :加强对农村的医疗卫生投入和预防保健 ,完善合作医疗 ,以及其他形式的农村医疗保障形式。