1) heterogeneous data
异质数据
1.
This article introduces the exchange of heterogeneous data combining Java and XML technology and the knowledge representation of XML.
在校园网环境下,采用XML文档作为底层的信息交换载体并给出XML的知识表示,通过Java Servlet创建异质数据互换的中间件,实现异质数据的互换。
2) heterogeneous data
heterogeneous data
3) Heterogeneous data
异构数据
1.
Design of quality control model about enterprise products based on heterogeneous database;
基于异构数据库的企业产品质量控制模型设计
2.
Intergrated platform of distributed heterogeneous data based on XML;
基于XML的分布异构数据集成平台
3.
The management method and integration study of heterogeneous data and the source;
异构数据的管理方法及异构数据源的集成研究
4) heterogeneous data sources
异构数据源
1.
Study and realization of data transformation approach between heterogeneous data sources based on IEC 61970;
基于IEC61970标准的异构数据源间数据转换方法的研究与实现
2.
An approach and realization of data transformation between heterogeneous data sources;
异构数据源间数据转换方法的研究与实现
3.
An Integration Scheme of Heterogeneous Data Sources based on XML;
一种基于XML的异构数据源集成方案
5) heterogeneous data source
异构数据源
1.
The Implementation of Heterogeneous Data Source Access Middleware Based on CORBA;
基于CORBA的异构数据源访问中间件的实现
2.
Design and Implementation of Heterogeneous Data Source Unified Search System Based on SOA;
基于SOA的异构数据源统一检索系统的设计与实现
3.
Design and Implementation of Heterogeneous Data Source Integration and Transformation System Based on ETL;
基于ETL的异构数据源集成和转换系统的设计与实现
6) heterogeneous data integration
异构数据集成
1.
Research of multi-plant-based heterogeneous data integration framework for manufacturing execution system;
基于多厂制造执行系统异构数据集成架构的研究
2.
Research on heterogeneous data integration model based on mediator;
基于协作者的异构数据集成模型研究
3.
Application study of PostgreSQL in heterogeneous data integration middleware;
PostgreSQL在异构数据集成中间件中的应用研究
参考词条
heterogeneous data sources
heterogeneous data integration
heterogeneous data integration technology
heterogeneous data integration system
heterogeneous data processing
heterogeneous data sources integration
distributed heterogeneous data
heterogeneous data exchange
heterogeneous data integration model
Heterogeneous data models
data communication of heterogeneous systems
Heterogeneous marine gravity data
Distributed heterogeneous data integration
exchange techniques of heterogeneous data
heterogeneous spatial data
heterogeneous data acquirement
heterogeneous data transmission
heterogeneous spatial data
Heterogeneous data flows
heterogeneous data retrieval
heterogeneous data warehouse
distributed heterogeneous data sources
二次编码
白毛藤多糖注射剂
补充资料:孪生质数
数学上把相差为2的两个质数叫做“孪生质数”。
孪生质数并不少见,3和5,5和7,11和13,17和19,29和31,都是孪生质数,再大一
点的有101和103,10016957和10016959,还有1000000007和1000000009。人们已经
知道:
小于100000的自然数中有1224对孪生质数
小于1000000的自然数中有8164对孪生质数
小于33000000的自然数中有152892对孪生质数
目前所知道的最大的孪生质数对是:
1000000009649和1000000009651
那么,孪生质数会不会有无穷多对?这个问题至今没有解决。早有人猜想孪生质
数有无穷多对,但是至今没有人证明出来。
解:
已知质数有无限个
设2,3,5,7,11,13......n个质数的积为m
m为n个质数的积
则m可以被已知的所有质数整除
而m-1和m+1不能被已知的任何质数整除
所以m-1和m+1都为质数
m-1和m+1的差为2
所以m-1和m+1是质数对
因为n有无限个
所以m也有无限个
m-1和m+1也有无限个
结论:
质数对有无穷多对
说明:补充资料仅用于学习参考,请勿用于其它任何用途。