无尚光荣的事业-邹时炎同志在全国高校图工委常委会暨图书馆工作座谈会上的发言(1991.5.23)

<正> 这次会议开得很及时,总结了过去几年图工委和高校图书馆的工作,交流了经验,研究了今后一个时期如何加强高校图书馆的工作,也对国家教委提出了很好的建议和要求。这次会议时间虽然不长,但内容比较结合我们的实际,讨论、研究比较认真,会议比预期的效果还要好。刚才与图工委的几位常委谈了一会儿,大家对我提了一些要求,有的要求我要带回去向党组和东昌同志汇报,有的工作就要由高炳章同志他们来努力了。当然还有些工作你们还要带回去,依靠学校的校长、书记帮助解决。     

论学校体育新课程教学中的建构主义理论思想

建构主义学习理论已经渗透到学校体育新课程教学的各个层面，就建构主义理论在学校体育新课程教学中所体现出的价值意义，对学校体育新课程的具体实施具有的积极作用做了阐述。     

Fostering Analogical Reasoning Through Creating Robotic Models of Biological Systems

This article considers student analogical reasoning associated with learning practice in creating bio-inspired robots. The study was in the framework of an outreach course for middle school students. Fifty eighth and ninth graders performed inquiries into behavior and locomotion of snakes and designed robotic models using the BIOLOID robot construction kit. We analyzed the interdomain analogies between biological and robotic systems elaborated by the students and evaluated the contribution of the analogies to the integrated learning of biology and robotics. The analogies expressed by the students at different stages of the course were collected and categorized, and their use in knowledge construction was traced. The study indicated that students’ reasoning evolved with learning, towards an increased share of deeper analogies at the end of the course. We found that analogical reasoning helped students to construct knowledge and guided their inquiry and design activities. In the proposed framework, the students learn to inquire into biological systems, generate analogies, and use them for developing and improving robotic systems.

     

图书馆网络环境建设

随着计算机和网络技术的发展，图书馆数字化进程方兴未艾，作者信息基础设施的图书馆网络环境的建设显得至关重要。醉对图书馆网络建设过程中的网络技术选型、网络系统结构以及系统安全等方面的问题进行了探讨。     

Microanalytical identification of Pb-Sb-Sn yellow pigment in historical European paintings and its differentiation from lead tin and Naples yellows

The work is focused on identification of lead tin yellow types I and II, Naples yellow, and also on discrimination of a less common, distinct yellow pigment, the ternary Pb-Sb-Sn oxide.The knowledge about all those Pb-based yellows was in fact forgotten after introduction of modern synthetic yellows in 19th century. As late as in the last decade of the 20th century, the existence of Pb-Sb-Sn yellow and its production have been rediscovered, and only then it has been identified in colour layer of artworks.Pb-Sb-Sn yellow has recently been identified in colour layer of 17th century Italian paintings by Sandalinas and Ruiz-Moreno [C. Sandalinas, S. Ruiz-Moreno, Lead tin-antimony yellow, historical manufacture, molecular characterization and identification in seventeenth-century Italian paintings, Stud. Conserv. 49 (2003) 41–52], and here we report the finding of this pigment in Mid-European painting of the 18th and 19th centuries. Lead tin yellows, lead antimony yellow (Naples yellow), and lead antimony tin yellow were synthesized in laboratory following historical recipes, their colour was analyzed, and their structure was confirmed to provide a basis for their routine identification in microsamples of artworks by X-ray microdiffraction. Unequivocal identification of Pb-based yellows could help in authentication of traditional European paintings, because their use was temporally and also geographically specific. Combination of elemental microanalysis (X-ray fluorescence electron microanalysis) and X-ray powder microdiffraction were found very efficient in the microanalysis of colour layers of artworks with Pb-based yellows and their unequivocal identification.     

Design of non-parametric process-specific optimal tuning rules for PID control of flow loops

The problem of designing optimal process-specific rules for non-parametric tuning is undertaken in the paper. It is shown that producing non-parametric process-specific optimal tuning rules for PID controllers leads to the problem that can be characterized as optimization under uncertainty. This happens due to the fact that tuning rules, unlike tuning constants, are produced not for a particular process or plant model but for a set of models from a certain domain. The novelty of the proposed approach is that the problem of obtaining optimal tuning rules for a flow process is formulated and solved as a problem of optimization of an integral performance criterion parametrized through values that define the domain of available process models. The considered non-parametric tuning assumes the use of the modified relay feedback test (MRFT) recently proposed in the literature. It allows one to tune the PID controller satisfying the requirements to gain or phase margins that is achieved through coordinated selection of tuning rules and test parameters. This approach constitutes a holistic approach to tuning. In the present paper, optimal tuning rules coupled with MRFT, for flow loops, are proposed. Final results are presented in the form of tables containing coefficients of optimal tuning rules for the PI controller, obtained for a number of specified gain margins. The produced non-parametric tuning rules well agree with the practice of loop tuning.     

三值电流型CMOS极性变换电路的设计

从电流型CMOS电路的特点出发,提出了混合开关理论,并将该理论应用于三值电流型CMOS电路的设计.此外,对所设计的极性变换电路利用SPICE程序进行了计算机模拟.