未定常數 的英文怎麼說

中文拼音 [wèidìngchángshǔ]
未定常數 英文
undetermined constant
  • 未 : Ⅰ副詞1 （沒） did not; have not 2 （不） not Ⅱ名詞1 （地支的第八位） the eighth of the twelve ear...
  • 定 : Ⅰ形容詞1 （平靜; 穩定） calm; stable 2 （已經確定的; 不改變的） fixed; settled; established Ⅱ動詞...
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 未定 : uncertain; undecided; undefined
  1. These should be four undetermined constants in the displacement function.

    位移函數中應有四個未定常數。
  2. On account of the uncertainty existing in the nonlinear ship responded model, we design a dynamic adaptive ship steering controller by using adaptive backstepping. after deducing the update law of the unknown constant, we choose the controller gains to guarantee the closed loop system and the control signal global boundedness

    由於船舶非線性響應模型中含有未知常參數的不確定項，因此採用自適應backstepping的方法，選擇參數自適應調節律，設計動態的船舶航向控制器，實現在線控制。
  3. In the current criteria, the principal parameters are given from linear elasticity analysis. the effects of cumulation in elasto - plastic working stage is hardly analysis. the stiffness calculation of current eccentric compression member is not specialy stipulated, with the result that the calculation of internal forces are crude

    指出《規范》公式中的主要參數均基於線性（彈性工作階段）分析，對結構實際工作階段（包括彈塑性、塑性工作階段）由於損傷累積而引起結構性能的變化涉及較少，對常見的偏壓構件的剛度計算也未作專門規定，這使得以往內力計算較為粗糙。
  4. 9. the extraction of nitric acid with tibopda and tbopda causes great shifts for the absorption peaks of both carboxyl group and ether group of the complex compound in ir spectrum. for the complex compound of eu, u and th, graet shift occurs only in the wave range of carboxyl group. the ethe

    本工作中求出的np （ v ）在低酸下歧化平衡常數未見文獻報道，對iaf料液中的鋒在調價後用加入尿素的辦法將其穩定在不易被草取的五價，在
  5. Results demonstrate that with the succession going on from herbosa shrubs coniferous forest theropencedrymion evergreen broad - leaved forest, abundance and diversity index of species, biomass and productivity of vegetation all show a rising trend prior to the formation of a mature and stable biotic climax

    結果表明：隨著草叢灌叢針葉林針闊混交林次生常綠闊葉林正向演替的進行，在未形成成熟而穩定的頂極群落之前，物種豐富度、物種多樣性指數、植被生物量及生產力都呈增大趨勢。
  6. 2. nonlinear source term identification problem about a quasilinear parabolic heat equation is investigated. for the given function determined, the existence and the uniqueness of the solution of the state equation are proved and the dependence of the solution of the state equation on the identification parameter is discussed ; then the identifiability is verified ; through choosing suitable basic functions, the above identification problem can be transformed into a constant coefficients identification problem ; and an practical iterative algorithm for solving the identification problem is presented, the feasibility and validity of the algorithm is verified by the numerical experiments

    2 、研究一擬線性拋物型熱傳導方程非線性未知源項的識別問題；對于給定識別函數，論證了狀態方程解的存在惟一性、方程解與識別函數的依賴關系和可識別性；通過選取適當的基函數，把對非線性源項的識別轉化成常系數識別問題；給出了實現非線性源項識別的迭代演算法，通過數值實驗證明了演算法的有效性。
  7. We could attempt to get around this difficulty by initially assigning the arbitrary value to another of the unknowns rather than to xn.

    開頭對另一個而不是Xn的未知數指定為任意常數，能試圖避免這個困難。
  8. Unlike the normal two stages estimate method ( the usual nonparametric weighted method combined with the least square estimate ), considering the characteristics of this model, this paper uses the least square estimate combining with the usual nonparametric weighted method and defines the estimators and n2 for the unknown parameter, the unkown fuction g ( ) and the unknown variance of errors 2

    與通常採用的兩階段估計方法即非參數權函數法結合最小二乘法不同，考慮到此模型本身的特性，本文採用最小二乘法結合一般非參數權函數估計方法，定義了未知待估參數和未知函數g （ ? ）及誤差方差~ 2的估計量（ ? ） _ n ， （ ? ） _ n （ ? ）和（
  9. The conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness. the requirement creates an over - conservative controller and enlarges chattering. the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay. the reaching law approach is used to get the conditions and band of quasi - sliding mode. the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions

    常規變結構控制用於不確定系統，須利用不確定性界確保系統的魯棒性，控制器過于保守且抖振變大.本文把未知干擾和參數不確定性的影響等效為名義系統的外界干擾，利用時延技術對干擾進行在線估計，並將估計值引入到變結構控制中，從而抵消掉系統中的慢變不確定性，利用離散趨近律法，推出了準滑動模態的存在條件及其帶寬.該方法克服了以往控制方法中須已知不確定性界的限制，且不必滿足匹配條件，用較低的控制增益保證了系統的魯棒性，降低了準滑動模態帶即削弱了抖振
  10. Abstract : the conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness. the requirement creates an over - conservative controller and enlarges chattering. the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay. the reaching law approach is used to get the conditions and band of quasi - sliding mode. the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions

    文摘:常規變結構控制用於不確定系統，須利用不確定性界確保系統的魯棒性，控制器過于保守且抖振變大.本文把未知干擾和參數不確定性的影響等效為名義系統的外界干擾，利用時延技術對干擾進行在線估計，並將估計值引入到變結構控制中，從而抵消掉系統中的慢變不確定性，利用離散趨近律法，推出了準滑動模態的存在條件及其帶寬.該方法克服了以往控制方法中須已知不確定性界的限制，且不必滿足匹配條件，用較低的控制增益保證了系統的魯棒性，降低了準滑動模態帶即削弱了抖振
  11. All this is to be done through actuarial science takes probability theory and mathematical statistics as its standing point, evaluates the outcome of risky events, the future financial balance as well as debt level for various economic programs. in this way, the actuarial science can help us put these programs onto a safety financial basis for future development

    精算科學是現代保險業和社會保障事業建立和正常運作的數理基礎，它以概率論與數理統計為基礎，與人口、社會、經濟有關科學相結合，對風險事件進行評價，對各種經濟安全方案的未來財務收支和債務水平進行估計，使經濟安全方案建立在穩定發展的財務基礎上。
  12. In this paper, chroma dc coefficients are selected as the carrier data because chroma dc coefficients are robust. also, alterable steps are used to select one part of the coefficients, so the watermark is imperceptible ; before watermark embedding, the watermark is divided into many parts, every part is individually embedded into one gop of the video, even if a gop is destroyed, the watermark can be extracted correctly, this methods promotes the robustness of the watermark ; in addition, in order to promote the security of the watermark, the user ' s id and password are used to generate chaos sequence by the chaos system which is created in this paper, later, watermark is mixed by the chaos sequence. also, the embedding position of the watermark bit is modified by one chaos sequence, so, unauthorized person can not extract or remove the watermark, since the embedding position is unknown

    本文認為，色度dc系數是魯棒性非常好的參數，因而選擇色度dc系數作為水印信息載體，同時，採用可變的步長選擇部分系數，保證了水印的隱形性；在嵌入水印時，本文採用水印信息「網格劃分」 、各子塊獨立嵌入視頻的方案，由於水印信息子塊是相對獨立的嵌入視頻中的每一相對獨立的圖組當中，即使某一圖組收到一定破壞，也能夠恢復水印信息，使水印的健壯性得到提高；此外，為了提高水印信息的安全性，在嵌入水印信息時，根據用戶輸入的id號和密碼，利用本文構造的混沌系統產生的混沌序列對水印信息進行變換，同時，對每一水印信息比特的嵌入位置也採用了偽隨機序列進行調整，這樣，未授權用戶不能提取水印信息，也難以擦除其中的水印信息，因為嵌入的位置是未知的。
  13. Assume you are in an unit to did not make any agreements with respect to salary and you, so, the monthly wages that the computational base of your overwork salary should be normal be out on duty 2300 yuan 70, namely 1610 yuan, divide again with every mean monthly system man - day counts 20. 92 days, be equal to 76. 96 yuan, accordingly, your " 51 " festal overtime should be 230. 88 yuan

    假設你所在單位未就工資與你做任何約定，那麼，你的加班工資的計算基數就應該是正常出勤的月工資2300元的70 ，即1610元，再除以每月平均制度工作天數20 . 92天，等於76 . 96元，據此，你的「五一」節日加班費應為230 . 88元。
  14. The future of the universe is mainly determined by the mean density of mass - energy and the space - time curvature, while cosmological constant does not carry any weight among popular cosmological theories

    現在流行的宇宙論都不考慮宇宙常數，宇宙的未來完全由質量能量的平均密度及宇宙的時空曲率來決定。
  15. A letter or symbol that represents a particular constant or number, known or unknown, and is not programmer - defined

    文字代表一特定常量或數字的可知或未知的字母或符號，非編程者所規定
  16. The notion of strictly passive is proposed for discrete singular systems. this paper concerns the robust passive control problem for discrete singular systems with uncertain parameters under bounded energy exogenous inputs

    最後研究具有未知定常不確定參數的離散廣義系統在有界外部輸入作用下的魯棒無源控制問題。
  17. We could attempt to get around this difficulty by initially assigning the arbitrary value to another of the unknowns rather than to xn

    開頭對另一個而不是xn的未知數指定為任意常數，能試圖避免這個困難。
  18. Common faults picked up by these pragmas are ambiguous references and de - references, use of undefined values, and some help identifying typos for unused or undefined functions

    這些標記引起的常見錯誤是：不正確的引用和取消引用，使用未定義的值，以及幫助判斷輸入錯誤，例如未使用的值或未定義的函數。
  19. Specifies that the certificate has an undefined name constant

    指定證書具有一個未定義的名稱常數。
  20. This means that the value of a local constant is undefined until the constant declaration statement is reached and that a local variable is undefined until the variable is assigned to in the function

    這就意味著在到達常數聲明語句前局部常數值是未定義的，在函數中分配變量前局部變量是未定義的。
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