软件开发中的资源共享研究     

查先进 《中国图书馆学报》2001,27(2)

ActiveX、OLEDB、ODBC、ADO等技术 ,在软件开发中具有明显的资源共享意义。通过它们 ,共享思想可以在软件资源开发中得到应用。OSS的涌现 ,为软件开发中的资源共享开辟了新纪元 ,可避免重复开发造成的浪费 ,提高用户二次开发能力 ,有利于软件人员提高技术水平 ,等等。参考文献 6。图 1。  相似文献   

多媒体技术及其在图书馆信息服务中的应用   总被引：5，自引：1，他引：4  

查先进  严冠湘 《现代图书情报技术》1997,13(5):53-56

文章概述了多媒体技术, 分析了多媒体技术应用于图书馆信息服务的必要性和可能性, 指出了多媒体技术在图书馆信息服务中的主要应用领域。  相似文献   

“3级5步”教学模式及其实践探索——以成都七中万达学校历史教学为例     

马云飞 《教育与教学研究》2017,31(6)

有效课堂中有许多任务,而任务可以分解为三级不同层次的问题,不同层次的问题可采取三级不同的对话来解决,对话中有激烈冲突,冲突中有精彩生成,生成中有愉快体验,体验中有知识形成和能力生成.有效完成教学任务,实现课堂教学目标,往往都要通过“问题式导入、原生态表达、多维对话、创生性对话、反思性追问”五步.为此,成都七中万达学校提出了“3级5步”教学模式.该模式在全校初步实施后,对历史学科的教学产生了重要作用,教师的教学和学生的学习方式出现了双重转变.  相似文献   

国家高新区自主创新环境建设情况     

王云霏 《中国科技论坛》2007,(8):16-18

本文通过对南京、苏州、无锡、常州4个国家高新区的案例,对全国高新区发展情况中的经验、做法、问题作一分析,并提出了相应的政策建议。  相似文献   

Output feedback control of electro-hydraulic asymmetric cylinder system with disturbances rejection     

Yunfei Wang  Jiyun Zhao  Haigang Ding  He Zhang 《Journal of The Franklin Institute》2021,358(3):1839-1859

To achieve accurate position control of electro-hydraulic asymmetric cylinder system with only available displacement signal, an output feedback controller is proposed in this paper. The dynamic model of the system is expressed as a Brunovsky form, which helps to estimate the system states and simplify the controller structure. Then Levant differentiator is introduced to estimate the position, velocity and acceleration of the asymmetric cylinder system based on the output signal, which can reduce the impact of measurement noise compared to the means of calculating the time derivative of the displacement signal directly. Besides, a high gain disturbance observer is designed to reject the lumped disturbance rejection of the system including parameter uncertainty, modelling error and external disturbance. Moreover, a sliding mode surface is introduced to the controller design and a robust item with continuous function is applied to compensate for estimation errors. According to Lyapunov theory, the developed output controller is pledged to be stable that can realize disturbance rejection control as well as backstepping-free control. Furthermore, a large-size asymmetric cylinder experimental rig is set up to simulate practical applications environment. Comparative experimental results reveal the validity and potential practical meaning of the developed control approach.  相似文献   

中国职业男女网球成绩现状对比分析     

胡云飞  周江勇 《搏击·武术科学》2011,(4):75-76,89

根据目前中国男女网球成绩在世界的排名对比,从训练学与社会学相关角度来分析中国男子竞技水平落后的原因,指出培养体质不完善、人才的断层、比赛与训练的脱轨、中国网球教练员的执教能力有待提高。中国男网可以借鉴女子的成功经验,让中国网球平衡发展,从而带动中国大众网球的发展。  相似文献   

电子商务环境下退货逆向物流系统性能评价指标及实证研究     

倪明  查玉莹 《图书情报工作》2011,55(8):135-74

由于电子商务自身交易的局限性,会产生企业无法避免的退货问题。在分析电子商务环境下退货逆向物流产生的原因以及系统特征的基础上,从退货回收处理成本、时间以及服务三方面衡量电子商务环境下退货逆向物流系统的性能。通过实证研究,验证指标的实用性。  相似文献   

基于信息技术的多学科融合研究     

杨漾  查先进 《中国科技资源导刊》2011,43(1)

首先分析关键信息技术及其对学科交叉融合的影响,然后以中国知网为平台,搜集各关键信息技术的论文发布数量.在数据分析中,先结合关注度和融合度进行了基本的统计分析,再利用相关分析,对基于信息技术的多学科融合趋势进行探讨.  相似文献   

浅谈高校动画原理与设计的教学问题及相应策略     

查诚 《科教文汇》2011,(33):54-55

近年来,动漫产业的迅速发展对动画专业人才提出了数量与质量的更高要求。如何培养高素质的动画专业人才,是每个高校必须认真思考与探索的一个问题。本文从当前动画教学中的问题出发,探讨在动画原理与设计实际的教学过程中出现的问题及解决策略。  相似文献   

Untangling the contributions of meteorological conditions and human mobility to tropospheric NO2 in Chinese mainland during the COVID-19 pandemic in early 2020     

Yuxiang Zhang  Haixu Bo  Zhe Jiang  Yu Wang  Yunfei Fu  Bingwei Cao  Xuewen Wang  Jiaqi Chen  Rui Li 《国家科学评论(英文版)》2021,8(11)

In early 2020, unprecedented lockdowns and travel bans were implemented in Chinese mainland to fight COVID-19, which led to a large reduction in anthropogenic emissions. This provided a unique opportunity to isolate the effects from emission and meteorology on tropospheric nitrogen dioxide (NO₂). Comparing the atmospheric NO₂ in 2020 with that in 2017, we found the changes of emission have led to a 49.3 ± 23.5% reduction, which was ∼12% more than satellite-observed reduction of 37.8 ± 16.3%. The discrepancy was mainly a result of changes of meteorology, which have contributed to an 8.1 ± 14.2% increase of NO₂. We also revealed that the emission-induced reduction of NO₂ has significantly negative correlations to human mobility, particularly that inside the city. The intra-city migration index derived from Baidu Location-Based-Service can explain 40.4% ± 17.7% variance of the emission-induced reduction of NO₂ in 29 megacities, each of which has a population of over 8 million in Chinese mainland.  相似文献