FPGA口袋实验室在数字电子技术实验中的应用

针对数字电子技术实验教学现状,将FPGA口袋实验室与全开放、自主学习的实验教学模式相结合,应用到数字电子技术实验课程中。实现了数字电子技术理论课程与实验课程的贯通,推动了实验教学内容的改革,促进了实验教学资源建设。应用实践结果表明,FPGA口袋实验室有利于培养学生的自主学习能力、动手实践能力和创新精神,为后续工程应用奠定了坚实基础。     

基于PCR及电泳技术,开展高中生物研究性学习

以“利用DNA条形码调查校园昆虫多样性”课题为例,叙述了如何利用PCR及电泳技术开展高中生物研究性学习的具体实施方案.     

Some aspects of science education in Britain: a comparative study

This article gives a broad picture of science education in Britain, starting with school pupils of about 11 years of age and concluding at the Ph.D. level. In the main it considers the education system from the point of view of students preparing for professional scientific work in basic and applied research as well as those who will leave the system at first degree level for a variety of occupations, ranging from school teaching to development and marketing posts in industry. The article is not directly concerned with the education and training of engineers and technologists. The British system is compared briefly with the educational patterns of several western European countries and the USA.     

Walsh Operational Matrices for Fractional Calculus and Their Application to Distributed Systems

The Walsh operational matrix for performing integration and solving state equations is generalized to fractional calculus for investigating distributed systems. A new set of orthogonal functions is derived from Walsh functions. By using the new functions, the generalized Walsh operational matrices corresponding to √s, √(s²+ 1), e^-s and e^-√s etc. are established. Several distributed parameter problems are solved by the new approach.     

论土地资源的定价方法

本文阐述了土地的经济、自然和社会主义市场经济体制中，土地使用权限的转让已进入市场。但土地价格的扭曲现象普遍存在，导致对土地资源的浪费或滥用。消除价格扭曲现象，要将马克思的地租理论作为确定土地价格的理论依据，从实际使用价值、选择价值、存在价值三方面对土地资土地资源、土地价格、定价方法     

External quality assessment for the RIA of thyroid related hormones: Second phase

An external quality assessment was conducted to assess the performance of various laboratories for RIA of thhyroid related hormones in two phases. In the first phase thirty five laboratories participated. At the end of first phase a meeting cum workshop was organised to discuss the results of first phase, difficultires faced by the participants and pinpoint the short oming. A second phase was then initiated with an objective of improvement in the performance, if any, where twelve samples from four pools were distributed to twenty four laboratories who participated for the second phase. The overall return of the results increased significantly from 71.8% (1586/2208) for the first phase to 92.4% (732/792) for the second phase. The inter laboratory %CV for T₃, T₄ and TSH were lower during the second phase (30.6%, 19.0% and 31.6% respectively) as compared to those observed during first phase (36.3%, 22.7% and 52.8% respectively). Similarly, there was an improvement in reproducibility of ALTM as %CV for T₃, T₄ and TSH decreased from 6.0%, 9.8% and 13.4% respectively to 4.5%, 4.6% and 8.5% respectively. The individual performances of the participating laboratories viz. bias, variability of bias and imprecision also showed a trend towards improvement as percent laboratories having desirable or acceptable results for T₃, T₄ and TSH increased from 10.7%, 60.7% and 0.0% respectively to 20.8%, 66.7% and 22.2% respectively. External quality assessment thus appears to be beneficial in assessing the performane of a laboratory in comfparison with other laboratories and indeed helps in improving the performance.