Our electronic technological development organizing devoted to the whole solution of the electronic product and suffused with household appliances , function type electric apparatus , electromechanics products equipment , etc . we offer the whole procedure service for industrial manufacturer . here many professional engineers with brand - new original idea , carry out the speciality of stepping research , has formed a service of following respects 凌錚電子技術(shù)開發(fā)組,主要致力于電子產(chǎn)品的整體解決方案,泛及家庭電器功能應用電器機電類產(chǎn)品大型設備,以及專業(yè)設計軟件cad cae cam等領(lǐng)域,充分的為工業(yè)廠商提供工業(yè)設計全流程服務。
The third part has proposed the model of modified bernstein operators , and defined a new function type on which has discussed the convergence of derivative operators of modified bernstein operators and modified bernstein operator on simplex and achieved the smallest terms which guarantee the convergence 第三部分提出了修正bernstein算子的模型,定義了新的函數(shù)類,在其上討論了修正bernstein算子的導算子和單純形上修正bernstein算子的收斂性,并得到了保證收斂的最小項數(shù)。
Because of the reason of history , a large amount of various different database that constructed exist on the network , in a lot of respects , there are several the following respects mainly in their different constructing nature behavior : 1 ) the constructing differently of system structure of the computer , each database is running in the mainframe , the microcomputer is , in work station , pc or embedded system ; 2 ) the constructing differently of basic operating system , the basic operating system of each database system can be unix , windows nt , linux . etc . ; 3 ) the constructing differently of dmbs itself can be all oracle of the database system of relation type , sql server , etc . , it can be a database of different data models too , such as relation , mode , level , network , target of facing , the database of function type ; 4 ) the structure of the data and sometime are constructed differently , each different databases are used and adopt different data structure and sometime expression way systematically 隨著internet的發(fā)展,網(wǎng)絡上存在著大量多樣異構(gòu)的數(shù)據(jù)庫,它們的異構(gòu)性表現(xiàn)在多個方面,主要有如下幾個方面: 1 )計算機體系結(jié)構(gòu)的異構(gòu),各個數(shù)據(jù)庫運行在大型機,小型機、工作站、 pc或嵌入式系統(tǒng)中; 2 )基礎操作系統(tǒng)的異構(gòu),各個數(shù)據(jù)庫系統(tǒng)的基礎操作系統(tǒng)可以是unix 、 windowsnt 、 linux等; 3 ) dbms本身的異構(gòu),可以是同為關(guān)系型數(shù)據(jù)庫系統(tǒng)的oracle 、 sqlserver等,也可以是不同數(shù)據(jù)模型的數(shù)據(jù)庫,如關(guān)系、模式、層次、網(wǎng)絡、面向?qū)ο?,函?shù)型數(shù)據(jù)庫; 4 )數(shù)據(jù)結(jié)構(gòu)及語義異構(gòu),各個不同的數(shù)據(jù)庫應用系統(tǒng)采用不同的數(shù)據(jù)結(jié)構(gòu)和語義表達方式。
Through the development of more than 40 years , after long - term high produce and steady produce of oil , daqing stride the development stage of mixing the mineral area economy with the city economy , and just develop from the mineral district of singleness mineral type toward the center city of comprehensive function type 經(jīng)過40多年的開發(fā)建設,在原油長期高產(chǎn)穩(wěn)產(chǎn)之后,大慶邁入了礦區(qū)經(jīng)濟與城市經(jīng)濟混存的發(fā)展階段,而且正由單一工礦型礦業(yè)城市朝著綜合功能型的中心城市發(fā)展。