極端向量 的英文怎麼說
中文拼音 [jíduānxiàngliáng]
極端向量
英文
extremal vector-
All - solid - state laser is an advantage lamp - house. it has many important applications and potential commercial value in many fields, such as industry, scientific research, military. so it ' s always the research focus of laser field. diode end - pumped solid - state laser has many merits. including high efficiency, long lifetime, high frequency stability, narrow line width, compact configuration, convenient for use et al, which made her a necessity in many high level quantum optics experiments. in this thesis, a series of experiment research was done with regard to blue laser, green laser and infrared laser
激光二極體端面泵浦的固體激光器具有效率高、譜線窄、壽命長、結構簡單、使用方便等優點，特別是採用環行諧振腔內加光學單向器構成的單頻激光器，由於頻率穩定，使其成為許多高水平量子光學實驗的主要光源。本論文圍繞全固態單頻藍，綠，紅外激光器進行了一系列實驗研究工作。If the upwelling is strong enough, the top of the poloidal loop is expelled from the core [ see box on this page ]
如果涌升流夠強，極向磁場環圈的頂端會被排出到地核之外（見本頁反向通量斑塊） 。The goal of a low sodium diet is to " push " this regulation system toward one end of its range, without pushing it to the limit when body sodium starts falling
低鈉飲食的目標是將此調整系統「推向」鈉攝入量允許范圍的一端，而不是在體鈉開始喪失時將其推到極限。The technical breakthroughs in growth of nd : cngg had been made. in particular, continuous laser operation was achieved from nd : cngg pumped by ld. when the crystal wafer was end - pumped by one bar of ld with 807nm wavelength, the cw laser output power of 123. 1 mw was obtained with slope efficiency of 22. 3 %
本論文用自動化熔體提拉技術成功生長出< 111 >方向的直徑25mm以上，長度80mm以上的平界面無核心nd : cngg單晶，確定了晶體結構和物相，測量了晶體的光譜性能，晶體消光比達到34db ，晶體生長技術有新的突破，實現了連續激光運轉，用單支807nm半導體激光二極體端面泵浦該晶體片子，在國內首次獲得123 . 1mw的1 . 062 m連續激光輸出，斜效率達22 . 3 % 。Because mathematics philosophy is largely the core of the philosophy of mathematics education, we briefly consider the essence of mathematics combined with the constructivism ernest creates the social constructive philosophy of mathematics going with the theory of mathematics pattern, we point out the development of mathematics is a constructive process of quantification pattern its accuracy should be identified by the mathematics community concepts, formulas, theorems and methods are all patterns the study of current philosophy reveals the definite philosophy of mathematics has turned into empirical and quasi - empirical philosophy the philosophy determines there are not only observing and proof, but understanding, analyzing, guessing, cooperation and communication in the learning community in the progress of mathematics development
由於建構主義受到了多種哲學思潮的影響，我們必須堅持辯證唯物主義的觀點，對它進行批判與分析，否則就容易走向極端，導致相對主義和唯心主義。由於數學哲學的研究在很大程度上占據著數學教育哲學的核心位置，我們結合建構主義對數學本質作了簡單的考察。英國學者歐內斯特創立了社會建構主義數學哲學，結合數學模式論，我們指出數學的發展是量化模式的動態建構過程，它的準確性要經過數學共同體的認同。As the application of distributed computing is used much more widely ， distributed database becomes a significant part of information management it avoids a lot of disadvantages of conventional centralized database ， and is applicable to many situations distributed database is a set of data which is the unity logic ， but in fact these data is located on different sites it is of high availability ， easy expansibility ， high concurrency ， high efficiency and etc in distributed system ， data redundancy is a method to improve the speed of query and the availability of system distributed query should shield the lower level details of data redundancy from end users ， distributed transaction should ensure data from disaccord this paper introduces basic conceptions of distributed database firstly ， discusses distributed transaction and concurrent control ， describes the development prototype mysql ’ s characters ， architecture and executive mechanism ， then shows the skeleton model of dpsql and exposes the strategy and algorithm of distributed query and distributed transaction ， at last analyzes the extra expenses and response delay of distributed processes this paper exposes the implementation mechanism of distributed query and distributed transaction emphatically distributed query uses the strategy of “ read one ， write a11 ” s0 in such a system if user ’ s requests are read - - only for the most part and the distribution of data redundancy is plausible ， efficiency is very high distributed transaction uses two - 。 phase commit protocol to ensure the consistency of global data ， which has less communication overhead
分散式查詢需要向用戶屏蔽數據冗餘分散的底層細節，分散式事務處理要保證全局數據完整，這都是傳統集中式數據庫不曾面臨的問題。本文首先介紹了分散式數據庫的概念性問題；接著討論了分散式事務涉及的定義及演算法；然後描述了dpsql的原型mysql的特性、結構和執行機制；繼而給出了dpsql的梗概模型，闡述了實現分散式查詢和分散式事務處理的策略及演算法；最後分析了進行分散式處理給系統增加的額外開銷和客戶端的額外響應延遲。本文重點描述了分散式查詢和分散式事務處理的實現機制，分散式查詢採用」讀一個寫全部」的本地優先策略，在讀操作頻繁的系統中，只要庫的分佈合理，單機效率極高，幾乎無任何附加開銷和延遲，而以整個系統的角度看來，吞吐量就更是優于單機系統；分散式事務處理採用兩階段提交協議，通信次數較少並能確實保證副本一致。分享友人