首次近似 的英文怎麼說

中文拼音 [shǒucìjìnsì]
首次近似 英文
first approximallon
  • 首 : Ⅰ名詞1 （頭） head 2 （首領） leader; head; chief 3 （表示方位） aspect 4 （姓氏） a surname Ⅱ動...
  • 次 : Ⅰ名詞1 （次序; 等第） order; sequence 2 [書面語] （出外遠行時停留的處所） stopping place on a jou...
  • 近 : Ⅰ形容詞1 （空間或時間距離短） near; close 2 （接近） approaching; approximately; close to 3 （親...
  • 首次 : for the first time; first
  • 近似 : approximate; similar; approach; approximation; roughness; propinquity
  1. Characteristics of heat balance parameters of arctic ocean drifting ice and open sea are presented based on the profile - flux method and the data obtained by the first chinese national arctic research expedition during aug. 19 24, 1999

    利用中國首次北極考察隊於1999年8月19日24日在北冰洋浮冰區獲得的大氣近地層垂直廓線和輻射等資料，依據相似理論方法，對比分析了北冰洋無冰海面和冰面上熱平衡參數的變化特徵。
  2. ( 4 ) on the efficient method for the dynamical core of the new generation multi - scale forecasting model i ) we present a new multi - level sparse approximate inverse preconditnioner for the complicated 3 - d helmholtz equations in the new generation weather forecasting model. as a result, the new sparse approximate inverse preconditioned gcr and gmres algorithms are given and successfully applied in the dynamical core. numerical tests show that the new algorithms perform very efficiently, and can greatly improve the efficiency of numerical model

    對此，本文提出了一種基於逐層門限技術的近似逆矩陣稀疏模式預選方法，並構造了相應的稀疏近似逆預條件子，結合gcr演算法和g州[ r衛s演算法，首次將逐層門限稀疏近似逆預條件子應用於新一代多尺度預報模式動力內核的實際計算，數值實驗表明這里給出的方法可以大大提高數值模式的計算效率。
  3. First, the nonlinear ls problem without constraint is converted to that subjected to inequality constraints by putting constraints on the do as of the received signals and toas of the first arrived signal with geometrically based single - bounce ( gbsb ) statistical channel model and cost - 207 model. then, a penalty function is used in the estimation of ms position

    首先，用基於幾何結構的單次反射圓模型和cost - 207模型，對期望定位用戶的各條多徑信號的波達方向和最先到達多徑信號的時間進行約束，將傳統的解無約束的非線性最小二乘定位問題或近似線性最小二乘定位問題轉化為解不等式約束的非線性最小二乘定位問題；然後，用內點罰函數法估計移動臺的位置。
  4. For the first time, the unified " hot " dispersion equation which can be used to analyze structures with different groove profiles is obtained by means of an approximate self - consistent field - theory

    採用近似自洽場論的方法，首次得到了適用於分析不同螺旋槽結構的統一的「熱」色散方程。
  5. ( 2 ) based on the propagation equation of fgbs passing through unapertured paraxial abcd optical systems, the similar transformation conditions are obtained for the first time, which is expressed as that two fgbs with the same beam order have similar intensity distributions at the two positions of equal generalized fresnel number when they propagate through two ajb, cjdi ( i = l, 2 ) systems. furthermore, a comparison between a fob and a sgb of the same beam a ^ - factor but different waist widths is performed for the first time

    （ 2 ）通過對作為整體的平頂高斯光束在無光闌限制近軸abcd光學系統中傳輸公式的分析，首次得到了平頂高斯光束的相似變換條件，即階數相同的平頂高斯光束在傳輸矩陣為a _ ib _ ic _ id _ i （ i = 1 ， 2 ）的兩個光學系統中傳輸時，在菲涅爾數相等的兩個面上具有相似的光強分佈。
  6. For the first time we investigate detailedly on the theory of the conductor - centered arbitrarily - shaped helical groove structure. we divide the arbitrarily - shaped helical groove into many consecutive small rectangle area to approximate the original groove. the recurrence relation of the admittance is obtained

    首次對具有中心導體軸的任意槽形螺旋槽結構的普遍理論進行了研究，通過以多層矩形階梯來近似代替任意形狀槽的邊界的方法，同時對導納的遞推關系進行了詳細的推導。
  7. The error analysis model of sampling system was set up for the first time, by combining the saddlepoint approximation analysis and numerical arithmetic, which greatly increased the potential of further application and improved the reliability of the error approximation of the optical sampling histogram

    論文首次建立了採用鞍點近似法與數值演算法相結合的取樣系統誤差分析模型，大大擴展了鞍點近似演算法的適用范圍，提高了誤碼率估算的可靠性。論文提出了基於時分取樣方法的光子模數轉換。
  8. Firstly part of quadratic term of taylor series is chosen ; a low - dimension surface is used to approximate limit state surface ; and the modified reliability formula is derived

    首次選取泰勒級數的部分二次項，用一個距原點最近點處擬合的超低維曲面近似極限狀態面。
  9. It ' s the first time clearly and systematically to present the concepts of restraint influence coefficient of steel to strain increment, to curvature increment and to deflection increment due to creep which are different each other. theoretical formulae are established, and approximate formulae are also obtained while considering the characteristics of common - used concrete and ambient condition of real bridges in china. so, an approximate restraint influence coefficient method to analyze the effect due to creep and shrinkage in pc bridges is put forward, and the equations to estimate second - force due to creep considering influence of steel in system - transferred continuous pc bridges is also established

    本文首次清晰而系統地提出了鋼筋對徐變的不同效應（徐變應變、徐變曲率、徐變上拱）約束影響系數的概念，建立了相應的計算式；結合我國普遍採用的混凝土的徐變特性和橋梁的構造特點及工作中南大學博士學位論文摘要環境特徵，給出了具有較高計算精度的實用計算式;在此基礎上，建立了橋梁徐變效應近似分析的鋼筋約束影響系數法，並推導出了考慮鋼筋影響的超靜定梁徐變次內力的近似計算式，可方便地應用於橋梁研究和設計中。
  10. Based on 16 230th dating ages and 1187 data of stable isotopic compositions as well as annual laminated sequences of the stalagmites, the author firstly presents the climate records of the past 2000 years in shennongjia region. by comparing the stalagmite record with historical records, lake sediments and pollen data, the author analyzes comparability and differences of climate change in east asia monsoon area and preliminarily investigates driven forces of climate change

    基於16個~ （ 230 ） th年齡、 1187個氧碳同位素數據分析和顯微巖相研究，首次建立了神農架高海拔地區近2000年氣候演化序列，通過與歷史記錄、湖泊沉積、孢粉資料對比分析了東亞季風區不同地區氣候演化的相似性和差異性。
  11. Based on a large amount of experimental data, nonlinear analysis, such as complexity theory, and approximate entropy ( apen ) which is adopted systematically in the fluidization research the first time, are implemented in the time series analysis of pressure fluctuation and particle concentration in gas - solid fluidized beds, and the nonlinear characteristics of fluidized beds are discussed comprehensively

    本文在大量實驗數據基礎上，將非線性方法，包括復雜性理論，以及首次被系統引入流態化研究的近似熵，應用到氣固流化床壓力及顆粒濃度脈動時間序列分析中，較為系統地探討了流化床的非線性特徵。
  12. The exact express of the intersection and union of the fuzzy sets defined by the rough membership function is given. two extension model of rst are introduced and their characters are discussed. we also discover the changes of the upper ( lower ) approximation after the attributes were added to or removed from the original attribution set

    首先得到了由粗糙隸屬函數所定義模糊集的交與並的確切表達，改進了以往文獻的結果；其次，提出了兩種粗糙集的擴展模型，並對這兩種模型的性質進行了討論；最後，得出了屬性集增加或刪除屬性後集合的上下近似的變化關系。
  13. The acceleration is first evaluated from governing equation, secondly, the formulae of displacement and velocity are developed basing on some assumptions, and then the discrete expressions of the response mean square value are deduced

    首先，直接從控制方程出發計算加速度，其次，給出了位移和速度的一種近似計算公式，最後，推導出響應均方值的離散計算表達式。
  14. Chapter 5 directly sets out from the green formulae of velocity potential due to the existence of lifting force, adopts an approximate kutta condition and firstly calculates the maneuvering hydrodynamics of a wigley ship with an attack angle using the present method of b spline

    由於有升力的存在，第5章直接從速度勢格林公式出發，並採用了一種近似的kutta條件，首次採用b樣條邊界元方法對作斜航船武漢理} _人學博十學位論文體的操縱水動力開展了數值計豹
  15. For the coupling between the laser diode and the tapered single - mode fiber, the overlap integral is used to compute the coupling efficiency on the basis that the laser diode outputting mode field and the fiber eigenmode field is approximated to basic - mode gauss field. and based on the same approximation, the coupling efficiency between the semi - tapered fiber and the laser diode is calculated by using the ray - traced method. the parameters are analyzed for the effect on the coupling efficiency and give the theory foundation to optimize the design of the tapered fiber coupling system

    首先通過對半導體激光器輸出模式場和光纖本徵模式場的高斯基模近似，利用交疊積分計算了錐形單模光纖與激光器的耦合效率問題；其次依據以上近似，利用光線跡蹤法計算了半錐形多模光纖與激光器的耦合效率問題，給出各個參數對耦合效率的影響和作用，為優化設計錐形光纖耦合系統提供了理論依據。
  16. In this part, inner and outer approximate boundaries are presented for the first time and their properties and processing idea are studied. and then we generalize the conceptions of inner and outer approximately definable sets. next, chapter 3 puts forward a new data filtering method based on both binary information system and degree of rough membership

    在此基礎之上，第二章討論了粗糙邊界問題? ?一類不可區分性不確定問題? ?的近似處理，首次提出了內外近似邊界的概念，並進行了相應的性質討論，然後給出了近似精確問題的三種近似處理思想，最後將內外近似精確集的概念推廣到程度近似精確集。
  17. Firstly, the concept of limited extended dominance relation is presented, secondly, the rough approximations of knowledge are obtained by limited extended dominance relation and decision rules of classification are acquired, thirdly, new method proves to be better than old one by contrast analysis, finally, the feasibility and effectiveness of new method are demonstrated by a real example

    首先提出了有限擴展優勢關系的概念；其次在有限擴展優勢關系下得到知識的粗糙近似，給出了分類決策規則；第三，通過對比分析，證明了新方法的性能優于現有方法；最後通過一個實例驗證新方法的可行性和有效性。
  18. The effectivity of the approximation of rayleigh wave in semi - infinite media to the plane mode in the stator transducer of saw motor with finite thickness ( much bigger than the wavelength of the saw ) is evaluated first time by us

    首次探討了用瑞利波近似表面彈性波馬達定子換能器（厚度遠大於表面彈性波波長）平板振動模式的有效性。
  19. ( 3 ) by means of expanding the aperture function into a finite sum of complex gaussian functions, the propagation of fgbs through a paraxial optical abcd system with hard - edged aperture is studied, and the approximate closed - form equations of apertured fgbs are obtained for the first time. the results obtained by using the approximate closed - form equation and collins formula are compared, and the condition under which the approximate closed - form equation is applicable is analyzed

    （ 3 ）利用光闌函數的復高斯函數展開法對截斷平頂高斯光束的傳輸作了研究，首次得到了截斷平頂高斯光束在近軸abcd光學系統中傳輸時的近似解析傳輸公式，通過比較用近似傳物公式和colhns公式直接數值積分所得的結果，得出了近似公式的適用范圍。
  20. Second, the issue of approximate aggregation query on the data streams is discussed. meanwhile, the approximate query theories based on the histogram synopsis is proposed, and the autosuited histogram synopsis method and the histogram synopsis synchronization method are provided. third, the problem of predictive aggregate queries on the continuous data streams is researched, and a new predictive aggregate query method based on basic window synopsis and predictive equation is given

    本文圍繞連續數據流上的聚集查詢展開討論，首先針對數據流上的精確聚集查詢問題，提出3種改進的基於滑動窗口的精確聚集查詢演算法，這三種演算法可以在消耗很少內存的情況下提供高效準確的查詢結果;其次討論了連續數據流上的近似聚集查詢問題，給出了基於數據流滑動窗口的直方圖大綱理論，並提出了適用於滑動窗口的自適應直方圖大綱生成演算法和大綱同步策略;最後討論了連續數據流上的預測聚集查詢問題，提出了一種基於基本窗口及預測方程方法的預測聚集查詢演算法。
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