EWB仿真技术在受控电路中的应用

将EWB仿真技术应用到电子技术类课程教学中,学习者能够更好地了解电子电路的各种性质。利用该技术可以将传统上在实验室利用真实元器件进行的试验转换为计算机虚拟仿真技术进行,真实的再现电路工作过程。该技术也是一种对学生实际能力培养的有效工具。     

用转移法求解含受控源的电路

对于含有受控源的电路,其分析、计算方法常常将受控源作为独立电源看待．但是,受控源是非独立电源,它的电流或电压受电路中其它支路的电流或电压控制．当控制电流或电压发生变化时,受控源的电流或电压也要相应变化．因此,含受控源电路的分析和计算有其特殊性,往往比较复杂,不易掌握．若能对受控源或受控源的控制量进行适当的转换,则可使电路简化．1受控源的转移1．1受控电压源的平移先看下面的例题．例1求图1所示电路中的电流I1该电路是含受控电压源的复杂电路,用一般的解法如支路电流法、节点电压法、回路电流法等来解,都比较复…     

广义Thervenin-Norton定理

通过对含有受控源的线性电路的分析,提出了广义Thevenin-Norton定理.     

受控核聚变的一种新途径：—低能注入式磁盖势阱约束法受控核聚变

提出了磁盖势阱（MLPW）－一种静电装置,该装置是在球形静电热阱的外围加上磁盖而构成的,可用于受控核聚变,通过建立磁盖势阱中带电粒子的运动方程并取单粒子谐振子近似以及运用自治场的统计方法,球形聚变炉内大量带电粒子的集体行为被计算机所研究和模拟,由于使用了电场与磁场的联合约束,与单独的磁约束或惯性约束受控核聚变相比,所需达到的技术指标将有所改善,工程技术上的难度也会有所降低。     

戴维南定理在分析低频放大器中的应用

本文从教学角度出发,介绍用戴维南定理在晶体管低频放大器电路分析中的应用,通过用两种方法分析放大器的输出电阻,指出在应用戴维南定理分析含有受控电源的二端网络应注意的地方.     

戴维南定量在分析低频放大器中的应用

本文从教学角度出发,介绍用戴维南定理在晶体管低频放大器电路分析中的应用,通过用两种方法分析放大器的输出电阻,指出在应用戴维南定理分析含有受控电源的二端网络应注意的地方。     

质量受控学科信息门户研究

对质量受控学科信息门户(Quality-controlled Subject Information Gateway以下简称QSIG)进行研究，有利于我们认识QSIG的重要作用，接受QSIG高质量、系统化的信息服务理念；同时，可将之作为在我国大规模建设QSIG的理论与实践参考。     

索引图像的几个问题(续)

7　基于概念的索引通过应用一个受控词表选词描述图像所包含的概念 ,进而索引图像 ,使用一个自然语言对图像进行描述来索引图像 ,或使用视觉词典链接图像到原形图像来索引图像。概念索引一直是人类的一个功用。除非在非常狭窄的领域 ,在一个图像中识别对象一直是难以自动实现的。　　 7.1　基于概念索引的受控词表( 1 )肖像类别 ( ICONCLASS)。在艺术史范围内作为一个主要研究领域的肖像画开发 ,刺激了用于描述肖像画主题词表的需要。肖像类别是由WAAL开发的 ,始创于《低级乡村艺术的十进制索引 ( Decimal Index of the Art of the L…     

尽快将“敏感信息”从国家秘密中分离出来

中、美都有敏感信息,但具体管理方式差别很大,最突出的是美国有独立的敏感信息管理制度,而我国的敏感信息大多按照国家秘密管理,应该尽快将敏感信息从国家秘密中分离出来,建立独立规范的敏感信息管理制度。     

The Controlled Digital Lending Model by Libraries in the Digital Transformation北大核心

Controlled Digital Lending(CDL) is a new model by which libraries digitize materials in their collection and make them available for controlled lending. CDL was initially introduced 10 years ago and has been developed quickly after 2020. This paper sorts out the concept and development of CDL, and divides the process of CDL into embryonic stage(2011-2017), exploratory stage(2018-2019) and development stage (2020 to present). In the embryonic stage, although there were related research and attempts, the specific concept of CDL had not been formed and the practice was not enough. In the exploratory stage, the concept and core principles of CDL had been defined and received plenty of attention in the American library community. During the development stage, the COVID-19 pandemic has brought opportunities for CDL to globalize, and CDL is supported by the library circle around the world. This paper analyzes the feasibility of CDL according to the relevant laws and regulations in the United States, Europe and the international community. In the United States, CDL is mainly based on the principle of first sale doctrine and fair use; in Europe, CDL is mainly related to relevant directives and copyright restrictions and exceptions; among the international community, CDL basically complies with the relevant provisions of the three-step test. This paper summarizes the status quo and specific operation mode of CDL practice abroad, in the hope of providing suggestions for the specific practice of CDL in Chinese university libraries. The authors sort out the official website documents of well-known foreign library organizations and CDL tool development institutions, summarize foreign practical cases of CDL, and analyze related application cases in foreign university libraries and CDL tool. This paper discusses the legal possibility of implementing CDL in China. A further review of relevant domestic laws has found that, although the Copyright Law of the People’s Republic of China only stipulates 12 acts that can use works without permission and remuneration, the court can still determine that the mode of CDL constitutes fair use based on the general provisions of the fair use in dealing with cases related to CDL. Lastly, this paper points out that China’s libraries, especially university libraries, shall limit the books types, reasonably apply CDL tools, actively cooperate with publisher, and build the platform of digital lending resources sharing to promote the digital services transformation of physical library in CDL way. 38 refs. © 2023, Editorial Office of Journal of Library Science in China. All rights reserved.