pcg 中文意思是什麼

The engineering bacterium which carried bcih i - chi and i - glu cdna was pcg - ii. two methods of agrobacterium - mediated and gene gun were used to transformate long ya lillium. the results of pcr analysis and southern dot blotting hybridization demonstrated that the chi a nd glu cdna have been intergrated into host genome. at the same time ; compared agrabactenum - mediated method with gene gun method, the transformation frequency of the former was 16. 7 %, while the latter was 50 %, so gene gun transformation method was suitable for long ya liiliwn

用攜帶有幾丁質酶基因和- 1 、 3葡聚糖酶基因的工程菌，通過農桿菌介導法和基因槍轉化法轉化龍牙百合，經pcr和點雜交檢測證明外源基因已經整合到植物染色體中。同時對農桿菌介導法和基因槍法進行比較，發現農桿菌介導法的轉化率為16 . 7 ，基因槍法的轉化率為50 ，因此可能基因槍轉化法更適于龍牙百合的遺傳轉化。

One of its most important applications is to improve the optimization algorithms by evaluating the relevant derivatives information efficiently the aim of the work includes : to establish and study new algorithms - - cf - pcg algorithrns with ad ; to establish and study the extended cf - pcg algorithm ( ecfpcg ). cf - pcg algorithms with ad is proposed on the basis of cf - pcg algorithms with sd, in addition to replace sd with ad, there are other significant modification to the algorithms. the results by theoretical analysis and numerical experiments implicate that cf - pcg algo - rithm with ad is an improvement to newton method with ad

論文首次將自動微分應用於牛頓- pcg型演算法，構造了新演算法，並從理論上比較了新演算法與牛頓法的效率，證明了新演算法的效率嚴格大於牛頓法的效率，而且新演算法與牛頓法的效率比分別是問題維數n和目標函數復雜性的嚴格單調遞增函數，當n趨于無窮大時，這個效率比的下界以ln （ n ） ln2的速率趨于無窮大。

As a steel product of higher additional value, seamless steel pipes are often impacted by raw material supply and macroeconomic environment just as other industrial products and investment projects. the constant domestic economic growth in the coming five years as well as national enlarged investment in energy projects offers pcg a very good opportunity for growth in seamless steel pipes

無縫鋼管是鋼鐵產品中一項附加值較高的產品，作為工業品和資本項目投資的原材料受宏觀經濟環境影響較大，未來五年內國內的宏觀經濟持續好轉及國家對能源項目的大力度投入給無縫鋼管這一產品的發展創造了一個良好機遇。

For solving nonlinear optimization problems, newton method is one of the most efficient methods. as modification to newton method, inexact newton methods are popular for solving the middle and large scale noniinear optimization problems. among them, cf - pcg ( newton - pcg ) method is an efficient improvement to newton method

在非線性最優化的研究中，牛頓法是二階演算法，對牛頓法的改進，一直是人們關注的問題，近年來，用共軛梯度法對它進行改進，即研究牛頓- pcg型方法是國內外的一個研究熱點。

Such an enhanced standard of special pipes can help to dodge the direct competition of substitute products ; 2, while readjusting the varieties of products, pcg should practice forecast of annual profit and control of the production process to establish marketing price system through cost behavior analysis of varying ; 3, pcg should perfect and reinforce sub - marketing channels to set up customer supply chain of powerful competitiveness ; 4, pcg should also offer quality customer service to further promote the additional values of products

運用變動成本法理論按成本習性建立營銷價格體系。 3 、完善和強化公司的分銷渠道，建立具有核心競爭力的客戶供應鏈。 4 、作好服務，提升產品附加值，挖掘產品的期望層和附加層價值，在增加顧客總價值的基礎上降低總顧客成本。

Steihaug has shown that an approximate solution of the trust region problem may be found by the pcg method

共軛梯度法由於不需要矩陣計算和存貯，成了解大型問題的首選方法。

Application of ssor - pcg in engineering

的工程應用

In chapter 4, some examples are given to illustrate that the convergence of saor - al - pcg method is better than the classical iterative method ( such as jacobi. gauss ? seidel. sor ) and the traditional cg method as well as ssor - pcg

第四章用實例證明了這種預條件共軛梯度法的收斂速度比古典的迭代法（如jacobi ， gs ， sor ）和傳統的cg以及ssor - pcg要快一些。

Pias1, a protein that was also located in test ' s specifically was got pdz domain protein tight junction protein 2 and pcg ( polycomb group ) family ring1 and polycomb 2 were included

3kbp （ kyotbindingpotcin ）功能的研究： kbp是我們通過酵母雙雜交獲得的與kyo 』 fz相互作用的一種新分子。

Mr alex arena, chief executive officer of pcc, issued a letter to mr donald tsang, financial secretary ( fs ), on pcg s rationale as to why a private treaty grant would be warranted for the cyberport project

Pcc的行政總裁alexarena先生致函財政司司長曾蔭權先生，闡釋盈科認為需要以私人協約方式批地供發展數碼港計劃的理據。

It is proposed on the basis of the analysis on newton method and the preconditioned conjugate gradient method ( pcg method ). numerical derivatives can be evaluated by symbolic differ - entiation ( sd ), finite difference approximation and automatic differelltiation ( ad ). ad has significant advantages over other two approaches

自動微分是一種新的能精確而有效地計算導數的方法，它優越于傳統的微分方法，例如它比符號微分和差分方法的計算成本低，又比差分方法計算精確，自動微分在近幾年發展迅速，應用廣泛。

Ecg and pcg data automatic analyzer

心電和心音圖自動分析儀

Mr kam chui of pcg issued a letter to ms eva cheng, ds ( itb ), to follow up the issues raised in mr richard li s letter dated 15. 2. 99

盈科的kamchui先生致函資訊科技及廣播局副局長鄭汝樺女士，跟進李澤楷先生1999年2月15日函件所述事項。

For the first time in china the ebe - pcg and ebe - bictstab algorithin have been got by combining ebe technology with pcg and bicgstab, and precondition matrix on the basis of ebe has been attained

本文首次將ebe技術與pcg和bicgstab迭代法結合起來，得到并行的ebe - pcg演算法和ebe - bicgstab演算法，選取了基於ebe的預處理矩陣。

And it is indicated in " efe " matrix analysis that pcg maintain an average status in employing external opportunities and reducing the external threats

公司目前的efe矩陣分析結果顯示公司利用外部機會和迴避外部威脅方面處于中等水平。

Application of pcg - 400 torch lighting system

400火炬點火系統的應用

For the parallel analysis, several interfaces have been developed, on one hand, in order to parallelize the existing serial fea codes and make the system practical, some parallel solver library has been integrated into ooparafea ; on the other hand, ooparafea can also integrate self - developed module into its analysis kernel, in fact, it has already integrated parallel cg solver and parallel pcg solver up to now. in webfea, just like other parts in netfeaf, the class hierarchy ( including two dimension fea class library, three dimension fea class library, internet based fem computer aided instruction and so on ) is introduced first, and the control center which integrated httpserver ( used for building internet project web site ) and computingserver ( dealing with different computing tasks ) takes charge of the whole system. netgrawcad is the application of netfeaf in civil engineering, which offers civil engineers a network based works

論文還開發了全新用途的網路服務中心，包括http服務器、計算服務器，以及各種用途的計算客戶端：利用java語言的網路通信、界面處理能力結合集群的密集并行計算能力一起完成特定的計算任務，從而使集群計算與web計算很好的集成在一起； webfea作為一種應用客戶端，配合netfeaf集成系統的各個計算組成部分，可以實現一個比較全面的有限元分析方法的計算機輔助課件；當前基於web的各種應用越來越廣泛，但將基於網路的工程設計與有限元分析系統的面向對象構建其引入有限元分析以及土木工程設計領域還不多，基於netfeaf系統，作者又利用面向對象的方法實現了基於網路的重力式碼頭cad集成系統，以從根本上改變傳統的工程分析設計軟體的運行思路，使網路變成土木工程師的日常工作中心，系統部分成果通過鑒定（文通部鑒定為「國內領先，可以大大提高設計效率，建議在水運行業內盡快推廣使用」 ）推出后的良好試用效果，使面向對象的方法在土木工程分析設計軟體系統研製中的優勢得到進一步驗證。

So, as the worst case when the computation cost of the objective function is negligible, the improvement is strictly increasing with respect to n and tends to + oc approximately at a rate lnn / ln2 when n - + oo. the results also show that the im - provement of cf - pcg algorithin with ad over newton method with ad is much greater than the improvement of cf - pcg algorithm witll sd over newton method with sd

本文也對不同的微分方法下牛頓- pcg演算法與牛頓法的效率比進行了比較，得出：在一般的假設下，使用自動微分下的效率比嚴格大於使用符號微分下的效率比，而且它們的比值隨問題維數n趨于無窮，即應用自動微分的牛頓- pcg演算法對牛頓法有進一步的改進。

Making use of the computing model and technique above described, these pem parallel computer prograrns for calculation of 2d and 3d turbulent flow have been coded by ebe - pcg and ebe - bicgstab

利用上述的計算模型和處理技巧，結合ebe - pcg演算法和ebe - bicgstab演算法，編制了二維和三維紊態流場的有限元并行計算程序。

Abstract : a new preconditioner is proposed in the preconditioned conjugate gradient method ( pcg ) for solving the problem arising from image restoration. the condition number of the new preconditioned system is proved to be much less than the original one. numerical results show that the new method is better than the classical pcg

文摘:在圖像恢復實際模型的預條件共軛梯度法中，提出了一種新的預處理運算元.將新的預處理運算元應用於原來的系統，證明了其條件數得到大大的改善.實驗結果表明，新的預處理運算元具有很大優越性，比傳統的預處理運算元具有更快的收斂速度