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第十三届全国计算机辅助教育(CBE)学术年会征文通知
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《中国电化教育》 CSSCI 北大核心 2007年第12期59-59,共1页
第十三届全国计算机辅助教育(CBE)学术年会定于2008年5月下旬在东北师范大学召开。本届学术年会的主题为'计算机与教育:应用促进学与教创新',旨在推进计算机在信息化学与教环境构建中的有效开发与应用,促进我国教育信息化的深... 第十三届全国计算机辅助教育(CBE)学术年会定于2008年5月下旬在东北师范大学召开。本届学术年会的主题为'计算机与教育:应用促进学与教创新',旨在推进计算机在信息化学与教环境构建中的有效开发与应用,促进我国教育信息化的深入发展。会议接受论文并将通过审查的论文集结正式出版(不收版面费等任何费用,部分论文可以在会议上报告)。现就有关会议征文工作具体通知如下: 展开更多
关键词 计算机辅助教育 东北师范大学软件学院 CBE 学术年会
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基于PLC控制伺服电机实现全自动同步升降重物双闭环控制系统
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作者 朱涛 《自动化应用》 2024年第13期126-128,133,共4页
利用PLC较强的控制稳定性和伺服电机的闭环控制技术,针对大型重物的升降工艺要求,使用工业现场总线作为通信协议,设计一种基于PLC控制伺服电机实现全自动同步升降重物的双闭环控制系统,详细阐述了控制系统的硬件组成、组件选型及程序设... 利用PLC较强的控制稳定性和伺服电机的闭环控制技术,针对大型重物的升降工艺要求,使用工业现场总线作为通信协议,设计一种基于PLC控制伺服电机实现全自动同步升降重物的双闭环控制系统,详细阐述了控制系统的硬件组成、组件选型及程序设计。经过多个工程应用证明,本控制系统的性能稳定、精度高、稳定性强。 展开更多
关键词 伺服控制 伺服电机 双闭环控制
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镍合金的窄间隙焊接工艺 被引量:11
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作者 胡义良 杨晓成 《电焊机》 2008年第3期65-66,共2页
通过分析镍基合金性能和焊接性,在少量焊接试验的基础上,确定了焊接方法和工艺参数,焊接接头质量优良,完成了设备验收的焊接工艺试验,解决了镍基合金窄间隙焊接的技术难题。为CBE-LIBURDI的NG系统在核电应用条件下的工艺开发奠定了基础。
关键词 镍基合金 窄间隙焊接 焊接试验 焊接工艺
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附着式振动器模具在隧道管片预制中的应用 被引量:2
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作者 张弛 石卫 《混凝土世界》 2017年第7期94-97,共4页
1982年,法国CBE集团研发成功附着式振动管片模具。这项技术于2006年随铁道部北京铁路直径线隧道使用CBE管片模具而传入中国。十年来,附着式振动管片模具已在国内得到广泛的推广,目前国内在用的CBE附着式振动器模具约有5000多块,分布... 1982年,法国CBE集团研发成功附着式振动管片模具。这项技术于2006年随铁道部北京铁路直径线隧道使用CBE管片模具而传入中国。十年来,附着式振动管片模具已在国内得到广泛的推广,目前国内在用的CBE附着式振动器模具约有5000多块,分布在29座城市的地铁隧道中,并且以每年约1200块的速度增长。由于附着式振动模具拥有巨大的应用优势,近两年其仿制产品也在不断增加。 展开更多
关键词 隧道管片 振动器 附着式 模具 应用 预制 CBE 地铁隧道
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基于CFD的水电站厂房水力振源模拟研究
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作者 万晓丹 耿聃 秦净净 《水电能源科学》 北大核心 2019年第9期74-77,154,共5页
传统的水力振源特性研究主要依赖于模型试验,计算方法亦过于简化。通过建立水轮机全流道模型,基于CFD计算软件,对正常工况下的厂房进行了流体计算,总结了蜗壳壁面压力脉动的变化、分布规律及数值大小,进而根据CFD计算结果拟定了5种水力... 传统的水力振源特性研究主要依赖于模型试验,计算方法亦过于简化。通过建立水轮机全流道模型,基于CFD计算软件,对正常工况下的厂房进行了流体计算,总结了蜗壳壁面压力脉动的变化、分布规律及数值大小,进而根据CFD计算结果拟定了5种水力振源施加方案,并利用谐响应算法计算了厂房楼板、机墩、风罩等薄弱部位的振动响应情况,认为可根据流体计算结果在蜗壳内壁不同部位施加相应简谐荷载;且在流体计算结果中提取厂房蜗壳壁面各点的压力脉动数值,采用时程分析法施加于蜗壳对应节点,观察厂房结构振动响应情况,给出了水电站厂房水力振源更加精确、合理的模拟与施加方式。 展开更多
关键词 水力振源 蜗壳 厂房振动 CFD
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基于AVR单片机的电子节气门实验控制系统研制 被引量:1
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作者 周秀珍 杨家富 +1 位作者 朱荣生 陈勇 《机械制造与自动化》 2018年第1期204-207,共4页
电子节气门是现代汽车发动机管理系统中的重要部件,也是汽车发动机教学仪器的组成核心。以ATmega128为主控芯片,以电子节气门为研究对象,基于PID控制算法,设计并实现了电子节气门实验控制系统。试验表明,该系统可以直观地展示节气门开... 电子节气门是现代汽车发动机管理系统中的重要部件,也是汽车发动机教学仪器的组成核心。以ATmega128为主控芯片,以电子节气门为研究对象,基于PID控制算法,设计并实现了电子节气门实验控制系统。试验表明,该系统可以直观地展示节气门开度对踏板位置信号的响应,满足汽车发动机电子节气门教学仪器的使用要求。 展开更多
关键词 电子节气门 单片机控制系统 PID控制 汽车教学仪器
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超疏水纳米复合涂层表面机械稳定性研究进展 被引量:6
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作者 任猛 李永升 +1 位作者 胡歆 唐昶宇 《塑料工业》 CAS CSCD 北大核心 2019年第3期8-13,共6页
超疏水涂层因其特有的性质在国防和民用领域有广阔的应用前景,但由于超疏水涂层脆弱的机械稳定性限制了其在实际生活中的应用。简要介绍了提高超疏水涂层机械稳定性的必要性以及失效的原因和机制,强调了聚合物和功能高分子材料在刚性和... 超疏水涂层因其特有的性质在国防和民用领域有广阔的应用前景,但由于超疏水涂层脆弱的机械稳定性限制了其在实际生活中的应用。简要介绍了提高超疏水涂层机械稳定性的必要性以及失效的原因和机制,强调了聚合物和功能高分子材料在刚性和柔性两类基底构建超疏水涂层中的作用,并综述了近年来国内外科研工作者为提高机械稳定性取得的成果,进一步展望了超疏水涂层的发展方向。 展开更多
关键词 超疏水涂层 稳定性 聚合物 应用
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SIMAD:Secure Intelligent Method for IoT-Fog Environments Attacks Detection
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作者 Wided Ben Daoud Sami Mahfoudhi 《Computers, Materials & Continua》 SCIE EI 2022年第2期2727-2742,共16页
The Internet of Thing IoT paradigm has emerged in numerous domains and it has achieved an exponential progress.Nevertheless,alongside this advancement,IoT networks are facing an ever-increasing rate of security risks ... The Internet of Thing IoT paradigm has emerged in numerous domains and it has achieved an exponential progress.Nevertheless,alongside this advancement,IoT networks are facing an ever-increasing rate of security risks because of the continuous and rapid changes in network environments.In order to overcome these security challenges,the fog system has delivered a powerful environment that provides additional resources for a more improved data security.However,because of the emerging of various breaches,several attacks are ceaselessly emerging in IoT and Fog environment.Consequently,the new emerging applications in IoT-Fog environment still require novel,distributed,and intelligent security models,controls,and decisions.In addition,the ever-evolving hacking techniques and methods and the expanded risks surfaces have demonstrated the importance of attacks detection systems.This proves that even advanced solutions face difficulties in discovering and recognizing these small variations of attacks.In fact,to address the above problems,Artificial Intelligence(AI)methods could be applied on the millions of terabytes of collected information to enhance and optimize the processes of IoT and fog systems.In this respect,this research is designed to adopt a new security scheme supported by an advanced machine learning algorithm to ensure an intelligent distributed attacks detection and a monitoring process that detects malicious attacks and updates threats signature databases in IoTFog environments.We evaluated the performance of our distributed approach with the application of certain machine learningmechanisms.The experiments show that the proposed scheme,applied with the Random Forest(RF)is more efficient and provides better accuracy(99.50%),better scalability,and lower false alert rates.In this regard,the distribution character of our method brings about faster detection and better learning. 展开更多
关键词 Attack detection FOG IoT network machine learning distributed mechanism
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Special issue on carbon capture in the context of carbon capture, utilisation and storage (CCUS)
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作者 Meihong Wang Eni Oko 《International Journal of Coal Science & Technology》 EI 2017年第1期1-4,共4页
With global energy demand predicted to rise as the world population increases, there is a serious challenge to ensure energy security and also to reduce CO2 emissions. Atmo- spheric CO2 levels will reach about 800 ppm... With global energy demand predicted to rise as the world population increases, there is a serious challenge to ensure energy security and also to reduce CO2 emissions. Atmo- spheric CO2 levels will reach about 800 ppm by 2100 resulting in about 4 ℃ rise in the earth surface temperature if no action is taken (CO2 Earth 2017). At the 21st Con- ference of Parties (COP21) to the United Nations Frame- work Convention on Climate Change (UNFCCC) held in Paris, France from 30th November to 12th December 2015, 195 nations historically agreed to "combat climate change and unleash actions and investment towards a low carbon, resilient and sustainable future" with the aim to ensure global temperature rise is kept well below 2℃ (UNFCCC 2015). To achieve this aim, a portfolio of technologies have been proposed, one of which is carbon capture, utilization and storage (CCUS) (Dixon 2016). 展开更多
关键词 二氧化碳排放量 联合国气候变化框架公约 捕获 大气CO2浓度 上下文 存储 捕捉 温度上升
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An Overview of Information and Communication Technology (ICT) in Jordan: Review the Literature of Usage, Benefits and Barriers
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作者 Anas Al Bakri 《International Journal of Internet and Distributed Systems》 2013年第2期9-15,共7页
This paper presented a background of the extent of the ICT, IT, and EC-B2B in Jordan. It was mentioned that the development of the ICT in Jordan brings benefits to the enterprises and their TPs. In this paper the EC-B... This paper presented a background of the extent of the ICT, IT, and EC-B2B in Jordan. It was mentioned that the development of the ICT in Jordan brings benefits to the enterprises and their TPs. In this paper the EC-B2B systems’ readiness in Jordan is defined as the degree of preparation of a nation or community to participate in and benefits from ICT development. The government in Jordan has taken forceful measures towards adoption IT and IS applications and Internet awareness. In 2010, it was reported from the DOS in Jordanthat the percentage of individual Internet usage did not exceed 4.7 percent of the population inJordan[1]. This paper highlighted through subsections on the benefits and risks faced EC-B2B system adoption in Jordan. Based on the recent studies and reports in Jordan, the EC-B2B system adoption was mainly adopted by large enterprises in the supply chain rather than by SMEs. The study concluded that the main two barriers of ICT development and adoption inJordanare organizational readiness including lack of new education methods, and lack of information and knowledge. 展开更多
关键词 Information Technology ELECTRONIC COMMERCE ELECTRONIC GOVERNMENT
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The Internet-EDI Systems Adoption by Enterprises in Jordan: Descriptive analysis of Adoption, Strategies and Benefits
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作者 Anas Al Bakri 《International Journal of Internet and Distributed Systems》 2013年第3期18-24,共7页
This paper reviewed and explored the current extent of the Internet Electronic Data Interchange systems adoption in Jordan particularly in the SME sector. Also the paper presented the benefits of IEDI adoption and sho... This paper reviewed and explored the current extent of the Internet Electronic Data Interchange systems adoption in Jordan particularly in the SME sector. Also the paper presented the benefits of IEDI adoption and showed the main obstacles facing the SME in Jordan to adopt. This paper used the descriptive and theoretical analysis approaches for collecting and analysis the historical and archived data. The literature showed that Jordan, as a developing country, has achieved forward steps in introducing the Internet to the different sectors of life. The adoption of the electronic tools in business became a governmental target in recent years to make it possible for SMEs to be able to continue to achieve success in their business [1]. Most of Jordanian SMEs have little or no competitive pressure to use I-EDI systems, since most suppliers, customers and other competitors do not seem to promote I-EDI systems. The study concluded that SMEs in Jordan could grow and become larger companies, and supporting national economy. Thus it is very important to develop and grow Jordanian SMEs by doing more research. 展开更多
关键词 Internet-EDI Technology ADOPTION I-EDI STRATEGIES
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Assessment of the effect of modern transformation on the traditional settlement 'Ksar' of Ouargla in southern Algeria 被引量:6
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作者 Moufida Sebti Djamel Alkama Ammar Bouchair 《Frontiers of Architectural Research》 CSCD 2013年第3期322-337,共16页
The architecture of the Ouargla Ksar has long been recognized as an example of adaptation to harsh climate in the deep desert of AlgeHao Over the last few decades, it has undergone some changes in its initial urban st... The architecture of the Ouargla Ksar has long been recognized as an example of adaptation to harsh climate in the deep desert of AlgeHao Over the last few decades, it has undergone some changes in its initial urban structure, due to accelerated and uncontrolled modern urbanization, that had negative implications and devaluation of its thermal characteristics. This article tries to understand the bioclimatic concept of adaptation of this Ksar and assess to what extent its morphological transformation has impacted its microclimatic conditions. This assessment is made through a comparative study between two different areas: one untransformed and the other transformed. A referential weather station situated in the suburbs was also exploited for consolidation of comparison. The investigation was undertaken using site measurements and observations. 展开更多
关键词 Ksar Traditional settle-ment Ouargla DESERT Transformed COMFORT
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长跑冠军
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作者 吴紫怡 《少先队小干部(综合版)》 2002年第9期51-51,共1页
大森林里的动物王国要举行长跑比赛,公开选拔长跑冠军。 狮子想:我可不能报名参加比赛。大家都知道我的奔跑速度快,但他们不知道有时候我是跑不过一只羚羊的。倘若我参加比赛得不了第一,岂不有损我百兽之王的盛名。 羚羊想:我是不能... 大森林里的动物王国要举行长跑比赛,公开选拔长跑冠军。 狮子想:我可不能报名参加比赛。大家都知道我的奔跑速度快,但他们不知道有时候我是跑不过一只羚羊的。倘若我参加比赛得不了第一,岂不有损我百兽之王的盛名。 羚羊想:我是不能参加比赛的。六家都知道我跑得快。可那是在大戈壁上。现在换了场地,我可没有得冠军的把握。万一跑不过其它选手,太没面子了。 猎豹想…… 展开更多
关键词 比赛 长跑 冠军 奔跑速度 大森林 羚羊 动物 狮子 报名 王国
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《格拉斯-斯蒂格尔法案》的废除:神话与现实(上)
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作者 乌娜.麦克唐纳 朱芳琳 《金融市场研究》 2017年第1期123-135,共13页
格拉斯-斯蒂格尔法案颁布于1933年,旨在应对20世纪二三十年代的银行危机,将投资银行和商业银行业务严格划分开。1999年生效的格雷姆-里奇-比利雷法案废除了上述法案的部分条款。此后,金融危机爆发,一些人继而将危机的部分原因归咎于该... 格拉斯-斯蒂格尔法案颁布于1933年,旨在应对20世纪二三十年代的银行危机,将投资银行和商业银行业务严格划分开。1999年生效的格雷姆-里奇-比利雷法案废除了上述法案的部分条款。此后,金融危机爆发,一些人继而将危机的部分原因归咎于该法案的废除。然而事实证明并非如此。 展开更多
关键词 格拉斯-斯蒂格尔法案格雷姆-里奇-比利雷法案金融危机 美国联邦储备委员会
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