集中常數 的英文怎麼說

中文拼音 [jízhōngchángshǔ]
集中常數 英文
centralized constant
  • 集 : gatherassemblecollect
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 集中 : concentratecentralizefocusamassgroupmassingput togather
  1. Second, the starting and stopping behaviors under disturbed condition are analyzed and calculated by using the dynamic concentrative parameter model, which gives some advice to better prescribe refrigeration system and set theoretic foundation for carrying out automatic control of refrigeration system. third, the normal running process is analyzed and calculated by means of rational matching theory, which gives some advice on how to better understand the parameter change under steady state and the affection of inlet - parameter on evaporator. fourth, the simulation software with dynamic characteristic is designed, which can be applied to calculate thernio - parameter of cryogen, air humidity and frost thickness under different initial and boundary conditions, and to carry out dynamic simulation under conditions of dryness, wetness and frostiness, at the same time, to achieve detection and simulation at any stage from starting to stopping

    本文的主要內容如下： 1 ）對翅片管蒸發器結構特點進行分析，選取適當的微元控制體，就干、濕和霜工況下對每個微元分別進行傳熱傳質分析，基於經驗關系式確定霜的有關參數，對于霜工況下的霜生長建立模型，經適當假設，運用質量守恆、能量守恆和動量守恆方程建立適合動態模擬的蒸發器數學模型，為系統模擬奠定基礎； 2 ）對蒸發在大擾動下的開、停機過程，運用動態集中參數模型進行分析和計算，為更好地描述製冷系統運行的全過程奠定基礎，同時也為製冷系統實現自動控制提供一定的理論基礎； 3 ）對蒸發器正常運行過程，運用動態分佈參數和參數間定量耦合的觀點來分析和計算，為更好地了解穩態工況下各點參數的變化情況及各入口參數對蒸發器動態特性的影響即蒸發器性能對各參數變化的敏感性； 4 ）編寫翅片管蒸發器動態特性模擬計算程序，可以計算不同邊界條件和初始條件下的製冷劑熱力參數、空氣溫濕度和霜厚度分佈場，實現對翅片管蒸發器在干、濕和霜工況下的動態模擬。
  2. The important meaning in which this direction studied has lain in establishing the connection between the material science of concrete and civil engineering, analyse the strength in terms of material microcosmic or the mesoscopic, have important meaning to understanding, know the essential law of the strength of concrete. this text divides six chapters altogether. chapter one reviewed the pore structure in nowadays domestic and international research current situation, including the concrete examines research, research of the pore structure model and the research current situations of pore structure and strength relation of the pore method, have introduced some most important achievements of structure research of pore ; chapter two narrated much yardstick of the material mesoscopic structure of concrete and principle of examining pore technology of material of concrete, and the commonly used sign parameter in discussedding the pore and material pore of quito of cement and analyse, have explained that the influence factor of mip to the result of study of pore, has pointed out the limitation in mip in the pore structure ; analyse porosity and strength relation development course of model emphatically, and has carried on comparative analysis to the existing model, has pointed out the weak point of the original model ; on the basis of " ing integrate synthetically ", propose concrete pore structure compound body model and pore physical model of systemlex body ; chapter five carried on the corresponding test data to compares to the model parameter appearing in model of chapter four with and analyses, have received k value of the characteristic of strength of matrices of reflecting according to the method to return to analysis, and calculate the influence produced on the strength of concrete in revision that can probed into the content of cement, elastic mould and surface energy, exactness of the inspection model ; chapter six is the conclusion, according to studying the survey this text to some research conclusions of the pore structure and making corresponding prospect to the structure development of pore

    第一章回顧了孔結構在當今國內外的研究現狀，包括混凝土測孔方法的研究、孔結構模型的研究及孔結構與強度關系的研究現狀，介紹了孔結構研究方面的一些最重要的成果；第二章敘述了混凝土材料細觀結構的多尺度性及混凝土材料測孔技術的原理，並討論了水泥基多孔材料孔隙分析中常用的表徵參數，也說明了壓汞法測孔對研究結果的影響因素，指出了壓汞法在孔結構研究中的局限性；第三章是著重分析了孔隙率與強度關系模型的發展歷程，並對已有的模型進行了比較分析，指出了原有模型的不足之處；第四章在「綜合集成」的基礎上，提出了混凝土孔結構復合體模型和孔系統的物理模型，並模擬了該模型下由各單體並聯形成的復合體的斷裂過程，最後根據所建模型編制了相應的計算程序，可根據輸入的孔徑分佈與水泥含量等參數，實現混凝土理論強度的計算；第五章對第四章模型中出現的模型參數進行了相應的試驗數據對比分析，根據回歸分析的方法得到了反映基體強度特徵的k值，並從理論上探討了水泥含量、彈性模量和表面能的修正對混凝土強度計算產生的影響，檢驗模型的正確性；第六章是結論與展望，根據研究綜述了本文對孔結構的一些研究結論並對孔結構發展作了相應的展望。
  3. When the electric interlocking apparatus at station do not work, we can exactly and promptly obtain, the states of switch in route, display in notebook computer by white strip light plainly, and thus increase the safety coefficient enormously and train working efficiency

    系統自成體系，當車站電氣集中設備停用后，使用該系統能夠及時、準確地反映進路上的道岔狀態，並將所排進路以白光帶的形式直觀地在筆記本電腦上顯示出來，大大提高了非正常情況下接發列車作業的安全系數和作業效率。
  4. In fact there are few people are familiar with fem and in generic department usually only uses fem to analyse several aptotic problems. so when we analyse a problem only need to change the size of model and magnitude of force. we can use existing fem software and program language to build new system

    在實際的有限元軟體使用過程中，對具體行業而言，分析的問題都集中在具體的一部分問題，在對某一具體問題的分析中，需要用戶進行調整的參數往往是比較固定的，所以對具體問題的分析模塊進行參數化資源共享對實際應用中提高有限元軟體的使用效率是非常有效的。
  5. Scientific research and design institute of cscec in guizhou cooperate with prof. peng xiaoqin, and research the bond technology of the new and old concrete. which are researched to four points as follows : 1. several major methods evaluating the degree of roughness were analyzed, and their advantages and disadvantages were analyzed

    貴州中建建築科研設計院與重慶大學材料學院彭小芹教授合作，主要對新舊混凝土粘結技術進行了研究，主要集中在以下幾個方面: 1 .分析目前常用的幾種評價粗糙度的方法，並對每種方法的優缺點進行評述;提出一種簡便易行的測量粗糙度的方法，克服目前常用方法的缺點，並通過多組數據和灌砂法進行相關性分析，得出兩者之間的關系。
  6. The second aspect is the study and application of fitting method after introducing curve fitting method, we will study least - squares procedure used frequently in engineering fields. in addition, we will encode according to item requirement and least - squares procedure algorithm, then using the data picked from image processing to fit the equation we needed

    在介紹了曲線擬合方法之後，主要研究工程設計中常用的最小二乘法，根據課題要求以及最小二乘法的演算法要求編寫源碼，將圖像處理后採集來的數據擬合成所需要的方程。
  7. The data in data warehouses and data marts is usually updated frequently, and the data loads are typically very large

    數據倉庫和數據集市中的數據通常會頻繁更新，因此數據加載量通常會很大。
  8. Lots of concrete examples are (, ) - metrics. and one of fundamental problems in finsler geometry is to find and study finsler metrics with constant ( flag ) curvature. on the basic, we majarly study the following problems in present paper : ( a ) to the property of a class of (, ) - metrics in which is parallel with respect to riemann metric a and riemann metric a is of constant curvature, we obtain the following theorem4. 3 let f (, ) be a positive definite metric on the manifold m ( dimm > 3 )

    在finsler幾何中，我們現在已知的finsler度量已經很多了，但大多數具體的例子主要都集中在（ ， ） ?度量中，又在finsler幾何中一個基本的問題就是去發現和研究具有常曲率的finsler度量，基於這些本文主要研究了以下一些問題： （ a ）一類關於是平行的並且riemann度量具有常曲率的（ ， ） ?度量的特殊性質，得到了如下的定理4
  9. To detect both known and unknown intrusion patterns, the system introduces a blended frame that makes use of both misuse detection approach and anomaly detection approach. the one of the highlight of the architecture is introduction of data mining technique, and the other is introduction of genetic algorithms. the ids uses data mining algorithms to abstract key features of system runtime status from security audit data, and it uses genetic algorithm to select the feature subset to reduce the amount of data that must be obtained from running processes and classified

    本文陳述了所研究系統的主要特點和技術：將智能體（ agent ）技術應用於入侵檢測系統，解決了傳統入侵檢測系統的集中式解決方案的弊病，充分利用網路資源協同完成入侵檢測任務；利用基於主機和基於網路的數據源，形成一種完整的混合型的結構，從而能收集到更加全面的信息；使用了異常檢測技術和誤用檢測技術，採用一種混合型的結構，既能檢測已知的攻擊模式，又能發現新的攻擊模式。
  10. The digital television set - top - box reflects the advanced level focalization on multimedia computer and communication technology

    摘要數字電視機頂盒的技術含量非常高，它集中反映了多媒體、計算機、通信技術和網路技術的發展水平。
  11. Growth factor methods : these involve scaling an existing matrix by applying multiplicative factors ( often derived from predicted productions and / or attractions ) to matrix cells

    增長率法：通過對現有的矩陣（通常來源於預測的發生集中）乘以系數。
  12. Numerical simulation results indicate that, for low temperature dust particles, dust particles mainly exist in the area near the column center and their charge - number can be considered as a constant, while in the area where there are no dust particles, ion and electrons are in ambipolar diffusion ; for high temperature dust particles, both the distribution regions of dust particle and high ion density are expanded and dust charge - number is increasing with the distance from the center

    計算結果表明：當塵埃粒子的溫度較低時，塵埃粒子主要集中在圓柱形放電器的中心很小的區域，塵埃粒子攜帶的電荷幾乎是一個常數，受塵埃粒子空間電荷的影響，離子在該區域的密度最高。在遠離中心區域，離子和電子呈現雙及擴散特點；當塵埃粒子的溫度較高時，塵埃粒子分佈的區域和高離子密度區域擴大，塵埃粒子離放電器中心越遠，攜帶的負電荷越多。
  13. Through interview and investigation to the audiences and the principles from 6 volleyball clubs in 2005 - 2006 national league matches ’ season, the results indicate that most of the clubs don ’ t have a unified criterion in ticket layout designing. since the advertisement is usually combined with the ticket, it is not convenient for the consumers to get the relative information ; most of the clubs grade the tickets, but the price is usually above audiences ’ expectation which generally is concentrated in 20bmb and 30 ? 50 rmb ; the booking channel is not sufficiently unobstructed in some degree, and 37. 29 % of the interviewed audiences felt inconvenient, 3. 32 % met difficulty buying the ticket. those who consider convenient account for 59. 39 % ; advertisement is taken by most of the clubs as the common promotion strategy, while another promotion way that is to utilize public relation doesn ’ t get enough recognition ; most of the clubs don ’ t launch any market investigation before they make ticket marketing strategy and what ’ s more 4ps strategy unit lacks scientific theoretical basis

    通過對2005 - 2006賽季全國排球聯賽6個排球俱樂部的門票經營負責人員和現場觀眾進行訪問、調查，結果表明:大部分俱樂部的門票版面設計不科學、不合理，缺乏統一的標準，門票和廣告多為聯體型，消費者不易從中獲取信息;大部分俱樂部都制定了不同檔次的門票，門票定價不盡合理，有些偏高，現場觀眾願意接受的全國排球聯賽門票價格集中在20元左右;售票渠道還不夠通暢，在購買門票時仍有37 . 29 %的消費者感到不方便，有3 . 32 %的消費者感到非常難，感到購買門票方便的消費者佔59 . 39 % ;在選擇門票促銷方式時，廣告已經成為大多數俱樂部普遍採用的促銷方式，利用公共關系進行促銷還沒有得到各俱樂部的足夠重視;大部分俱樂部在制定門票市場營銷策略時都沒有經過市場調研， 4ps策略還缺乏科學的理論指導。
  14. Data is typically stored in many different data storage systems, and extracting data from all sources and merging the data into a single, consistent dataset is challenging

    數據通常存儲在很多個不同的數據存儲系統中，從所有源中提取數據並將其合併到單個一致的數據集中確實有一定的難度。
  15. Complex programmable logic device ( cpld ), usually used to develop asic, is widely used in digital system to accomplish complex combinational and sequential logic

    復雜的可編程邏輯器件（ cpld ）廣泛地用於數字系統中，常用作設計自己的專用集成電路，可實現復雜的組合邏輯和時序邏輯。
  16. It can acquire the voltage on the test appliance and current in the circuit. and it can see these electrical signals as its input and calculates based on the data and gives the parameters and waveform that user needed. the parameters we can get through calculation include power factor, joule ' s integral, available value, maximal value, minimum value, time constant etc. recently, there are many scholar is studying the algorithm that calculate the parameter using test data, but many of them adopt the heuristic method, not using the test data directly

    本課題研製一套電器試驗參數高速採集系統，能夠檢測試驗迴路中試品上的電壓信號和迴路中的電流信號，並根據這些電信號的數值利用計算機進行在線計算，並給出用戶需要的各種電參數值和用戶需要的波形圖，通過計算得到的電器參數有功率因數、焦耳積分、有效值、最大最小值、時間常數等。
  17. Abstract : it is well - known that the sampling period of some da ta acquisition syst ems ( das ), if not short enough, may limit the evaluation of their transient perfo rm ance

    文摘:數據採集系統的采樣周期是有下限的，即其採集速率不可能無限高，這在實際應用中常常限制了其瞬態響應特性的獲得。
  18. Because of that there is a lowest limit of the sampling rates of each data acquisition system, that is the sampling rate can not be at any value ( especially it can " t be at any high enough ), one can " t get the transient performance of das sometimes, and it may limits the evaluation of their transient performance

    由於采樣周期是有下限的，即採集速率不可能無限高，這在實際應用中常常限制了其瞬態響應特性的獲得，因而也限制了其傳遞函數的辨識和評價。
  19. Abstract : fatigue cracks in ship hull structures are most likely to occur in the highly stressed structural details. the conventional fatigue analysis is largely dependent on the determination of stress concentration factors ( scfs ) at the locations considered. this paper is concerned with the stress concentration of cutout in transverse web for longitudinal stiffener. a series of finite element models is carried out for the stress analysis of predefined structural details. the tabulated scfs of typical cutouts ( abs tanker rules ) in transverse web for longitudinal stiffeners are presented based on the finite element analysis ( fea ) results

    文摘:疲勞裂紋往往發生在船舶結構的局部高應力區，而疲勞分析結果通常取決于任何準確確定結構的應力集中系數.本文研究為鋪設縱骨而在艙壁板上開孔的應力集中，採用有限元方法對預先給定的結構進行應力分析，基於有限元計算結果給出了艙壁板典型開孔（參見abs油船規范）的應力集中系數表
  20. Lumped parameter systems are described by ordinary differential equations ; while distributed parameter systems are described by partial differential equations

    集中參數系統用常微分方程描述，而分佈參數系統用偏微分方程描述。
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