检索结果-南通市图书馆

在线全文

cnki会议

学校读者我要写书评

暂无评论

利用工控软件开发DCS仿真系统的新思路

计算机工程与应用 2003年第24期39卷 5-7页

作者：王宇红黄德先高东杰金以慧清华大学自动化系北京100084 中国科学院自动化研究所北京100080

提出了利用工控软件开发DCS仿真系统的新思路,并介绍了该思路的具体实现方法。仿真界面可以用工控软件组态实现。对DCS调节面板、趋势等画面可以通过定制ActiveX控件来完成。仿真操作界面和模型软件之间数据通讯通过DDE、OPC技术实现。... 详细信息

提出了利用工控软件开发DCS仿真系统的新思路,并介绍了该思路的具体实现方法。仿真界面可以用工控软件组态实现。对DCS调节面板、趋势等画面可以通过定制ActiveX控件来完成。仿真操作界面和模型软件之间数据通讯通过DDE、OPC技术实现。新的DCS仿真系统开发方法充分利用了工控软件的强大功能和DCOM、OPC、DDE、ActiveX先进技术,使得利用一种通用平台可以开发不同的DCS仿真系统,其体系结构具有良好的通用性。这极大加快了DCS仿真系统的开发速度。

关键词： DCS仿真器 OPC DCOM Activex 工控软件

Study on a harvester navigation and yield analysis system

在线全文

学校读者我要写书评

暂无评论

Study on a harvester navigation and yield analysis system

The First International Conference on Computers and Computing Technologies in Agriculture

作者： YUAN YANWEI ZHANG XIAOCHAO~* HU XIAOAN Institute of Mechatronics Technology and Application chinese academy of Agricultural Mechanisation sciences Box 25 No.1 Beishatan Dewai St beijing 100083 PR china

＜正＞A system attached to a small harvester and able to navigate was studied to analyse distribution information on wheat yield while *** this system,a balance-based yield flowmeter was built to detect the weight of moving *** transform methods were employed to reduce errors. GPS receivers and GIS technology were used to report coordinates and the corresponding yield data, based on which a yield map could be displayed synchronously,and the harvester track could be displayed on a digital map drawn by the system.A meter was programmed to accumulate and display the reaped area on a screen with data from a GPS receiver and header *** showed that the system can detect wheat weight with an error less than 3.5%,and it can create a digital map rapidly and display the harvester’s track as it *** reaped area was synchronously shown with errors less than 2.4%.

关键词： coordinate transform digital maps GIS GPS harvester meter harvester track yield map

Heat-inducible Expression of β-glucuronidase Gene in Tobacco

在线全文

cnki会议

学校读者我要写书评

暂无评论

Heat-inducible Expression of β-glucuronidase Gene in Tobacc...

2003年全国作物遗传育种学术研讨会

作者： CHEN Ming1 WANG Li-Xia2 PENG Xiang-Lei2 ZHONG Jin2 XU Hui-Jun1 LIN Zhong-Ping2* (1. Ministry Key Lab for Crop Genetics and Breeding, Institute of Crop Breeding and Cultivation of chinese academy of Agricultural sciences, beijing 100081, P.R.china 2. State Key Laboratory of Protein Engineering & Plant Genetic Engineering, Peking university, beijing 100871, P.R.china)

The expression of β-D-glucuronidase (Gus) gene under the control of soybean heat shock protein (HSP) promoter Gmhsp17.5C was investigated in transgenic Nicotiana plumbaginifolia plants after heat shoc

关键词： Tobacco promoter heat shock inducible

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于有线电视网的股票接收系统设计和实现

计算机工程与应用 2003年第3期39卷 201-203,232页

作者：张书台李锦涛巴力登新疆大学电气工程学院乌鲁木齐830008 中国科学院计算所数字化室北京100080

随着经济的发展,股票的接收和在线交易越来越受到人们的关注。该文充分利用现有的有线电视网的资源,设计出了适用于智能化家庭信息平台的可移植股票接收系统,并且使用计算机对股票信息进行实时接收,并提出了在线交易的解决方案。

关键词：有线电视网股票接收系统设计股票行情股票信息股票宽带广播系统传输流分组原始流 DVB

Research on the expansion characteristics of Mengzi remolded expansive soil

在线全文

学校读者我要写书评

暂无评论

Research on the expansion characteristics of Mengzi remolded...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Zhi-qing Li Institute of Geology and Geophysics,Key laboratory of Engineering Ge(?)chanics, chinese academy of sciences.beijing,china Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai university,Nanjing,china Li-chao Wang china Institute of Geo-Environment Monitoring,beijing,china Ru-jiao Tan Tianjin Municipal Engineering Design & Research Institute,Tianjin,china

Swelling tests of Mengzi remolded expansive soil immersed with water were carried out using simple *** characteristics of the expansive soil under different initial conditions were *** Dose Response model was used to fit the rules of swelling time intervals for expansive soil with water *** quantitative relationship between the swelling and overburden pressure,initial water content and initial dry density was attained using three dimensional regression *** important index obtamed could be provided for use in engineering design,construction and stability evaluations of expansive soil slopes.

关键词：

Towards the purely semiconducting boron and nitrogen co-doped single-walled carbon nanotubes

在线全文

cnki会议

学校读者我要写书评

暂无评论

Towards the purely semiconducting boron and nitrogen co-dope...

2011中国材料研讨会

作者： Wenlong Wang,Zhi Xu,Muhong Wu,Xuedong Bai,and Enge Wang,beijing National Laboratory for Condensed Matter Physics,Institute of Physics,chinese academy of sciences School of Physics,Peking university

＜正＞Ever since their discovery,carbon nanotubes（CNTs）,and single-walled carbonnanotubes（C-SWNTs）in particular,have taken a leading position in nanoscienceresearch owing to their well-known

关键词：

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于数据仓库的EIS数据管理体系结构

计算机工程与应用 2003年第19期39卷 17-20页

作者：王锁柱孙玉芳中国科学院软件研究所山西师范大学数学与计算机学院临汾041004

该文采用数据仓库的思想构建了EIS的数据管理体系结构,以满足EIS的数据分布性、格式多样性和结构复杂性的要求,克服了现有EIS响应速度低、可用性差等方面的缺陷。在该体系结构中,分别设置了硬信息获取、软信息挖掘模块和硬软信息集成、... 详细信息

该文采用数据仓库的思想构建了EIS的数据管理体系结构,以满足EIS的数据分布性、格式多样性和结构复杂性的要求,克服了现有EIS响应速度低、可用性差等方面的缺陷。在该体系结构中,分别设置了硬信息获取、软信息挖掘模块和硬软信息集成、链接模块,并就实现的关键技术提出了解决方式。

关键词：高层管理信息系统数据管理数据仓库

Research of Massive Heterogeneous Data Integration Based on Lucene and XQuery

在线全文

学校读者我要写书评

暂无评论

Research of Massive Heterogeneous Data Integration Based on ...

2010 IEEE 2nd Symposium on Web Society

作者： Liu Tianyuan~1,Song Meina~2,Zhang Xiaoqi~3 School of Computer,beijing university of Posts and Telecommunications beijing,china

＜正＞This paper proposes a model of massive heterogeneous data integration system based on Lucene and *** model shields distribution and heterogeneity of resources and achieves transparent access using materialized view of *** query efficiency is increased due to the highly effective categorization algorithm to segment data as an index with open source tool Lucene. Further,the model makes full use of the advantage of XQuery,which can process not only structured data but also non-structured data so as to solve the significant difference among various data sources as well as the efficiency of massive data access.

关键词： Massive Heterogeneous Data Lucene XQuery

在线全文

cnki会议

学校读者我要写书评

暂无评论

在NGC1068附近发现的一个新的类星体

天文学报 2001年第3期42卷 240-242页

作者：朱杏芬张昊彤褚耀泉中国科学技术大学天体物理中心中国科学院国家天文台北京100012

This letter shows that one X ray source close to classical Seyfert galaxy NGC1068 is identified as a quasar with redshift z=0.63. The very high surface density of quasars around NGC1068 suggests that these quasars may... 详细信息

关键词：类星体塞佛特星系 NGC1068 X射线源光谱图