離散變異 的英文怎麼說

中文拼音 [lísǎnbiànyì]
離散變異 英文
discrete variation
  • 離 : Ⅰ動詞1 （離開） leave; part from; be away from; separate 2 （背離） go against 3 （缺少） dispens...
  • 散 : 散動詞1. （由聚集而分離） break up; disperse 2. （散布） distribute; disseminate; give out 3. （排除） dispel; let out
  • 異 : 形容詞1 （有分別; 不相同） different 2 （奇異; 特別） strange; unusual; extraordinary 3 （另外的;...
  • 離散 : dispersed; scattered about; separated from one another; spread; debunching; straggling; fringing;...
  1. The ionosphere is a complex medium, which is aeolotropy, asymmetry, dispersive and changes randomly with time. in order to improve the communication quality of the shortwave that depends on the ionosphere, we should have aknowledge of the current condition of the ionosphere in real time. the backscatter sounding of high frequency can diagnose the real - time channel characters for shortwave communication or hf radar, which is great assistant to shortwave communication and hf radar

    電離層是隨機時變，各向異性，非均勻、色散的復雜介質。為了保證依賴于電離層進行的短波通信質量，必須了解電離層的實時狀態信息。高頻返回散射探測可以實時監測與短波通信或高頻天波雷達相關的天波傳播通道的狀態，對短波通信和天波雷達工作起了重要的輔助作用。
  2. Chapter nine, ten and eleven develop the discrete methods to price exotic options, in which chapter nine prices exotic options using the shooting target gird method, chapter ten prices the options using improved shooting target gird method when the underlying asset obeys cev process, and chapter eleven prices the double lookback options using five - bifurcation tree method. in the last chapter, application of option pricing theory is studied in executive stock option plan

    第九、十、十一章研究的是用離散方法對變異期權進行定價，其中，第九章是用打靶格法對一列變異期權進行定價；第十章，用改進的打靶格法對標的資產的價格服從cev過程的變異期權進行定價；第十一章用五叉樹模型對雙回望期權進行定價。
  3. Watermarking algorithm for digital image based on dct and svd

    一種基於離散餘弦變換和奇異值分解的數字水印演算法
  4. The method of compond target function variable weighting was adopted for solving compond target optimization problem, and compond target was put into single target

    在計算中，為達到無刷直流電動機全局優化的目的，採用隨機產生離散初始種群及隨機交叉操作和變異操作方法。
  5. Our group has prepared nanometer - scale metal films in layer structures on glassy carbon ( gc ) substrate by cyclic voltammetric deposition. by using co as probe molecule, we have revealed for the first time, abnormal ir effects ( aires ) on these layer nanostructured films. the alres consists of several abnormal ir features including the enhancement of ir absorption, the inversion of ir band direction ( anti - absorption ), and the increase of fwhm ( increase of the number of different adsorption sites )

    本研究小組採用電化學循環伏安電沉積法在gc基底上制備層狀納米結構金屬薄膜，以co作為分子探針，觀察到異常紅外效應（ aires ）光譜特徵，即co等探針分子發生紅外吸收增強、紅外譜峰方向倒反（反吸收）和譜峰變寬（振動能級離散程度增加） 。
  6. The ratio of isopropyl alcohol and pure water and temperature in the process of freezing are considerated in the research of the preparation of the pt / c electrocatalysts with freeze - drying method. the result shows, when we use 300ml pure water to wash the carbon ( 40mg ) in isopropyl alcohol ( 20ml ) to alter the ratio of isopropyl alcohol and pure water, we get the electrocatalysts with high catalytic activity ; the use of the liquid nitrogen ( - 196 ) to freeze the suspension ( carbon and precursor solution ) can make the pt / c electrocatalysts in high dispersion

    採用300ml純水對20ml異丙醇中的40mg碳載體進行洗滌抽濾，來改變預凍液中的醇水比例，通過冷凍乾燥制備pt / c的性能較好;採用液氮對預凍液進行冷凍（預凍溫度為- 196 ）制備的pt / c催化劑性能較好;冷凍乾燥法可以有效地避免加熱乾燥過程中前軀體離子在碳載體表面的脫附和團聚，進而制備載量大、分散性好、粒徑較小的pt / c催化劑。
  7. In dtc system, the concept of space vector is introduced to analyze and control the ac motor, the electromagnetic torque and flux are calculated and controlled in the stationary coordinate, and the optimal pwm gating signals are generated to control the inverter to acquire high dynamic torque according to the output of the bang - bang regulators

    直接轉矩控制採用空間矢量的概念來分析三相異步交流電動機的數學模型和各物理量，直接在靜止坐標系下計算與控制交流電動機轉矩和磁鏈，藉助于離散的兩點式調節產生pwm信號，直接對逆變器的開關狀態進行最佳控制，以獲得轉矩的高動態性能。
  8. Taking account of the corresponding characteristic of the signal singularity and wavelet transform module maximum in multi - scale changing, the discrete wavelet transform is applied to get the featured inflection point of negative pressure wave

    利用信號奇異點與小波變換模極大值在多尺度上變化對應的性質，將離散小波變換應用到獲取壓力波信號序列特徵奇異點中，可以對泄漏點進行定位。
  9. In this paper it is founding that at the aspect of extracting characteristic information of the pulse signals, the usual algorithm of the cwt has better superiority than the algorithm based on the discrete mellin transform

    在分析中發現，在提取吸毒者脈象信號中病變的異常信息方面，連續小波變換的一般演算法比藉助離散梅林變換的演算法具有更好的效果。
  10. We study the design of haar wavelet for scale = a ( a2 ) and present a decomposition and reconstruction algorithm in chapter 3. secondly, in chapter 4 we study the design of orthonormal mutiwavelets of multiplicity r with scale = a ( a2 ). by the factorization theory, we give parametric expressions for orthonormal causal fir multifilter banks of r = 2 and scale = 4, and we found the length of scaling function can be controlled by the parameters. finally, we provide the error analysis between discrete multiwavelet transform coefficients and continue multiwavelet transform coefficients

    由於多小波變換系數的計算是直接與其預濾波方式相聯系的，而在單小波變換系數計算中之所以能由近似表示就是因為尺度函數具有低通特性和平移正交性，由此我們研究了能滿足以上要求的預濾波，並對離散小波變換系數和連續小波變換系數之間的差異作了分析，從誤差分析結果我們可以預見：為了減少誤差我們可以通過對預濾波的進一步設計來控制。
  11. Based on modeling and analyzing the discrete mathematic model of hydraulic turbine governor system, the edge equation of stable domain of the discrete control system is obtained. according to this equation, the stable domain is specified. compared with continuous system, the changing rules and characters of the discrete system are found, which provide the theoretic foundation for researching the control strategy and the parameter adjustment of discrete control system of the hydraulic turbine governor

    在建立水輪機調節系統離散數學模型的基礎上，通過分析，給出離散調節系統的穩定域邊界控制方程，通過穩定域繪制，比較離散與連續系統的差異，找出離散調節系統穩定域的變化規律和特點，從而為研究水輪機離散調節系統的控制策略及調節參數整定提供理論依據。
  12. To increase our understanding of the pattern of the data, we must also measure its dispersion-its spread, or variability.

    為了加深對數據特徵的全面理解，還必須度量它的離散性，即數據的分散程度或變異程度。
  13. Base on the basic principle of continuum mechanics, 2 - d contact type model are derived using circular plate element. mohr - coulomb type failure criteria and failure coefficients related with stress ratio are used in this model to simulate the failure process. the wave propagation in an orthotropic plane under impact loadings was numerically simulated, by using this algorithm

    從連續介質力學的基本原理出發，推導基於圓盤單元的正交各向異性二維連結型離散元計算模型，在模型中採用了mohr - coulomb型破壞準則和與應變率有關的材料破壞系數用以模擬材料的動態損傷和破壞過程。
  14. In dtc system, the concept of space vector is introduced to analyze and control the ac motor, the electromagnetic torque and flux are caculated and controlled in the stator reference frame, and the optimal pwm gating signas are generated to control the inverter according to the output of the bang - bang regulator. in this paper, the dtc system is designed based on dsp. a speed estimation method is derived detailedly and the sensorless speed close - loop control is conducted. in this system, there are some problems, such as flux drift and torque ripple. to resolve these problem, a modified flux caculation method and some measures such as speed lpf, torque slide filtering are adopted. the system performance is enhanced by these mersures

    直接轉矩控制採用空間矢量的概念來分析異步電機的數學模型和控制其各物理量，直接在定子坐標系中計算和控制轉矩和磁通，藉助于離散的兩點式調節（ bang - bang控制）產生pwm信號，直接對逆變器的開關狀態進行優化控制，以獲得轉矩的高動態性能。本文採用dsp設計了直接轉矩控制系統，詳細推導了速度估計方法，進行了無速度傳感器的速度閉環控制。
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