Facile and efficient one-pot synthesis of 2-arylbenzoxazoles using hydrogen tetrachloroaurate as catalyst under oxygen atmosphere

In this paper, we presented a novel method for the facile and efficient one-pot synthesis of 2-arylbenzoxazoles, which oxygen atmosphere with anhydrous tetrahydrofuran (THF) as solvent or in solvent-free condition. The results show that this method could bring excellent yields as high as 96%. THF was proven to be the best choice among several solvents screened and the reaction was tolerated with a variety of aromatic aldehydes possessing electron-donating or withdrawing groups. The advantages of the present method lie in catalytic process using economic and environmentally benign dioxygen as oxidant.     

步兵分队敌火下运动的呼吸方法初探

步兵分队敌火下运动，体力消耗明显增大。运用合理的呼吸方法是降低体力消耗，充分发挥人体机能能力，保持旺盛体力，提高攻击分队战斗力的一个十分重要因素。只要将合理的呼吸方法应用于步兵分队敌火下 运动中，就能使战斗人员摄取最大氧量，提高有机体最大摄氧量的利用率，降低我分队的体力消耗，充分发挥体能优势，夺取进攻战斗的胜利。     

Finding the missing Einsteins: Expanding the breadth of cognitive and noncognitive measures used in academic services

Education researchers, policymakers, and practitioners are concerned with identifying and developing talent for students with fewer opportunities, especially students from historically marginalized groups. An emerging body of research suggests “universally screening” or testing all students, then matching those students with appropriate educational challenges, is effective in helping marginalized students. However, most tests have focused on two areas: math and verbal reasoning. We leverage three nationally representative samples of the U.S. population at different time points that include both novel cognitive measures (e.g., spatial, mechanical, and abstract reasoning) and non-cognitive measures (e.g., conscientiousness, creativity or word fluency, leadership skill, and artistic skill) to uncover which measures would improve proportional representation of marginalized groups in talent identification procedures. We find that adding spatial reasoning measures in particular—as well as other non-cognitive measures such as conscientiousness, leadership, and creativity—are worthwhile to consider for universal screening procedures for students to narrow achievement gaps at every level of education, including for gifted students. By showing that these nontraditional measures both improve proportional representation of underrepresented groups and have reasonable predictive validity, we also broaden the definition of what it means to be “gifted” and expand opportunities for students from historically marginalized groups.     

Assessment in special schools: national early assessment procedures and pupils attending special schools in England

An implicit assumption that fostering inclusion means having shared systems encompassing the needs of all children is evident in many aspects of policy development over the past decade. Reflecting this, the implementation of ‘baseline assessment’ schemes (i.e. testing at around age 5 years) is a statutory requirement on all state-maintained special and mainstream schools in England since 1998. Our argument is that the enthusiasm for commonality has obscured the need to question the value and validity of baseline assessment schemes for children with special educational needs (and possibly some others such as children having English as an additional language). We illustrate this position with reference to data from our recent study on baseline assessment in England. The study encompassed survey data from a national sample of 982 schools, of which 107 were special schools. Between them, these special schools used 42 different baseline assessment schemes. Comparisons between our mainstream and special school respondents indicated that there were similarities in the nature and perceived value of the schemes used. However, special schools were less satisfied with their schemes. We suggest that a reappraisal of the nature and purpose of baseline assessment for pupils with special educational needs warrants greater critical debate. Without this, there is a danger that a stress on commonality, veiling an inclusion orthodoxy, will ultimately be counterproductive.     

指数场合下定时截尾竞争失效产品步加试验的优化设计

对指数场合下定时截尾竞争失效产品步加试验的优化设计进行了研究，并得到了优化设计的方案。推广了D.S.Bai,Y.R.Chun(1991)的结果。     

论发声生理与歌唱

从发声生理学方面，论述了歌唱的声源，呼吸与共鸣，阐明了掌握一定生理声学知识，对我们科学，合理地使用发声器官，避免发生喉病，有一定的理论指导意义。     

在大学入学考试中增加心理测试的构想

考试在中国有着悠久的历史渊源。随着中国历史的变迁,从两千多年前“考试”一词的出现,经历了多少次的变化,直到今天的考试制度的建立。今天的考试制度,就以有代表性的高等学校入学资格考试而论,当然不能认为是尽善尽美的,但它却承担着为国家选拔专业人才和评价教育质量的重任,并且也在不断地改革完善中。考试是工具、是方法,工具是无可指责的,关键在于怎样用它。我们希望它能发挥更积极更广泛的作用,提出了在高等学校入学考试中增加心理测验的构想。     

Hydrogenation properties of mechanically milled Mg2Nio.8Cr0.2-CoO/Al2O3 composites

Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al2O3 catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under H2 pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg2Ni0.8Cr0.2 alloy surface was promoted by addition of CoO/Al2O3 catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg2Ni-based alloys.     

Degradation of chlorophenol by in-situ electrochemically generated oxidant

INTRODUCTION With the development of industry, more and more pollutants are discharged into environment, among them, phenolic wastes are typical contami-nants considered to be hazardous and top priority toxic pollutants listed by the USEPA. They are toxic even at low concentration. Due to their biorefractory, bioaccumulation and carcinogenic potential, the treatment of these contaminants is very important in environmental protection. Various technologies and processes have been tried …