波象差 的英文怎麼說

中文拼音 [xiàngchā]
波象差 英文
wave aberration
  • : Ⅰ名詞1 (波浪) wave 2 [物理學] (振動傳播的過程) wave 3 (意外變化) an unexpected turn of even...
  • : 差Ⅰ名詞1 (不相同; 不相合) difference; dissimilarity 2 (差錯) mistake 3 [數學] (差數) differ...
  1. And understanding and studying the spectral features and variation rules of geo - targets in the experimental area, raising that it is the basis of geo - targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo - targets, realizing that in a great extent spectral - integrated - form - based classification method can remove the phenomenon of " different spectrum with same objects " resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo - target with similar spectral forms and much different values of whole reflection ratio. it is suggested that " red edge " range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel - based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. the remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed

    研究結果如下:首先針對荒漠化地區的地物特徵,對高光譜數據不同段的數據質量、段組合進行了評價,提出了適用於荒漠化監測的基本段選擇集;初步了解和掌握了研究地區的地物光譜特性及變異規律,進一步明確了掌握地物光譜特徵和變異規律是用成像光譜儀數據提取地物信息的基礎;發現了基於光譜整體形狀的分類方法在很大程度上能夠消除由於傳感器、地物目標觀測方向之間的角度變化引起的反射率曲線整體平移的「同物異譜」現,對于譜形相似而整體反射率的值相較大的兩類地物,通過引入均值和方圖像參與分類得到解決;研究還表明在植被「紅邊」范圍內的段是進行荒漠化監測的主要特徵段,這些段與植被生物量和蓋度都有密切的關系,是開展精細植被分類研究和植被定量反演的重要基礎;像元的導數光譜分析可以消除土壤背景的影響,是進行植被生物量和蓋度定量反演的有力工具;建立了荒漠化監測主要評價因子的定量反演模型,並分析了模型的適用性。
  2. Firstly, chromatism analysis and wavelet transform are used for color image compression coding. in this method, one of the three color components of a color image ( for example the g component of a rgb color image ) is coded using wavelet transform, and the chromatism between g and other two color components rg = r - g, bg = b - g is coded respectively using chromatism analysis. during decoding, g ~ is first reconstructed using wavelet inverse transform and inverse quantisation, and rg, bg are reconstructed using chromatism analysis inverse transform ; then r, b are calculated by r = g + rg and b = g + bg respectively

    其一是應用色分析和小變換對彩色圖進行壓縮編碼,該方法是對彩色圖的三個色彩分量之一,如rgb圖的g進行小變換編碼,而對g與另兩個色彩分量的值(即rg = r - g和bg = b - g )進行色分析編碼,解碼則是通過反量化和小逆變換得到g ^ ,通過色分析的逆變換得到兩個重構的色rg ^和bg ^ ,再算出r ^ = g ^ + rg ^ 、 b ^ = g ^ + bg ^ ,最後由r ^ 、 g ^ 、 b ^重構圖
  3. According to the research mentioned above, this paper analyzes the bbk trust model whose critical attribute is binary, and indicates its disadvantages : trust failure punishment equals to that of success, which deviates reality ; malicious recommendation and unfair phenomenon is serious ; trust value fluctuates due to simple arithmetical average algorithm and computation lasts long

    基於以上工作,分析了關鍵屬性為二元屬性的bbk信任計算模型,指出其存在的問題:信任理解與現實存在偏?信任失敗的懲罰尺度等於成功信任尺度;存在嚴重的惡意推薦現和不公平現;採用簡單的算術平均計算信任值可能導致動很大;計算時延較大。
  4. The main work is as follows : 1. an error resilient algorithm to collaborate multiple description coding ( mdc ) and error concealment ( ecn ) is presented. the strategy of this method is to reconstruct the low quality image followed by recovering the lost wavelet tree with error concealment method when end - user receives few descriptions

    在誤碼環境下,要保證解碼端重構圖的質量,就要綜合採用多種抗誤碼方法,本文對錯復原技術的綜合應用進行了研究,具體內容如下: 1 、提出了圖多描述編碼與錯隱藏相結合的錯復原演算法,在接收端接收到的描述較少時,首先根據接收到的若干描述重構低質量的圖,然後採用錯隱藏方法恢復丟失的子樹。
  5. The algorithm can not only eliminate the influence of the cumulative errors of the photoelectric code recorder, but also it can satisfy the requirement of the real - time control. a direct inverse model controller of fuzzy neural network with changeable structure based on takagi - sugeno inference is presented and it is used to the motion control of mobile robot. in order to avoid the obstacles successfully, detection results from ccd and ultrasonic sensors are fused by a fuzzy neural network, which acts as an avoidance controller

    包括移動機器人的融合自定位問題:移動機器人利用光電編碼器進行自定位,同時用擴展卡爾曼濾器融合多個超聲傳感器的測量值,採用回朔演算法將融合值用於復位光電編碼器,消除了光電編碼器累積誤的影響,並能滿足實時控制的要求:並提出一種基於takagi - sugeno模型的變結構模糊神經網路直接逆模型控制器,並應用於移動機器人的運動控制;利用模糊神經網路避障控制器融合ccd攝機與超聲傳感器探測到的環境信息,以實現機器人的安全避障。
  6. The object of the paper is wavefront aberrometer produced by nanjing university of aeronautics and astronautics and su zhou 66 vision - tech co., ltd. the principle of aberrometer are detailedly introduced, image processing and automatic track techniques are also researched. according to research result, relevant control software has been developed in this paper, the conceptions of aberration are firstly described, synchronously, image processing and automatic track system are analyzed

    論文以南京航空航天大學與蘇州六六視覺科技股份有限公司合作研製開發的人眼前像儀為研究對,系統論述了人眼前像儀原理,重點對其中的關鍵技術? ?圖像處理與自動跟蹤進行了詳細研究,並開發出了相應的系統控制軟體。
  7. The microwave magnetic sintering can not only lower the sintering temperature and shorten the sintering time, but also decrease the micro - grain size of magnets and make intergranular phase and grain boundary of main phase distributed well. the abnormal grain growth was found in conventional sintered ndfeb magnets, which may be due to the greater particle size and uneven distribution of powder, and higher sintering temperature and longer sintering time. of course, the abnormal grain growth would deteriorate the magnetic properties

    磁場燒結的不但降低燒結溫度,縮短燒結時間,而且使磁體整體加熱,受熱更均勻,因而磁體晶粒更細小,並且主相晶粒邊界趨于規則化,晶間相的分佈更均勻;在常規燒結的磁體中則出現了晶粒異常長大現,造成這一現的原因,一方面可能是燒結溫度過高或燒結時間過長,另一方面可能是磨製的粉體均勻性較,存在的大顆粒被許多細小顆粒包圍,在燒結過程中,大顆粒不斷吞併小顆粒,逐漸長大,而異常長大的晶粒自然會導致磁體性能的惡化。
  8. Making use of the time series exhibitions of the fluctuation - rate datum, we make our study for the following two purposes : one is to observe whether the preannouncing companies " temporal - condition variance of the series of the return rate conforms to the demand of sta bility ; the other is to decide whether the preannouncing companies " stocks have asymmetrical - information adjustment, this is to say, to decide how the companies response to good or bad news

    為了進一步檢驗盈餘預告新規則實施效果,我們考慮從動性入手對股票市場的穩定性進行系統分析。我們嘗試利用動率數值的時間序列表現進行研究,力圖了解:預告公司股票日收益率序列的時變條件方是否滿足穩定性要求。預告公司股票是否存在信息非對稱性調整現,即對利好利空消息分別做出何種反應。
  9. These topologies of inverters are composed of two bi - boost dc / dc converters, they are symmetry. so whole circuit turn into four - quadrant converters, we can control every power mosfet on or off. then we can get sine wave with direct current polarization at the left, at the same we also can get sine wave with direct current polarization phase contrast 180 compared of the left at the right

    這類逆變器由左右二個雙向boostdc / dc變換器構成,左右二邊是對稱的,所以整個電路構成了一個四限變換器,我們可以恰當控制各功率管的開、關,使左邊的兩限dc / dc變換器輸出一個帶直流偏置的正弦,使右邊的兩限dc / dc變換器輸出一個相180度帶同樣直流偏置的正弦形,這樣,負載zl上的電壓是左、右兩個dc / dc變換器電壓的動輸出,正好可以消掉直流偏置,最終在負載r1上得到的就是正弦
  10. The tests of e - o applications by our flux ktp has been realized, the results showed : optical waveguides fabricated by using an ion - exchange process, which have an exchange - ion concentration depth profile and refractive - index profile, is close to a complementary error - function distribution, optical homogeneity and device thermal stability is much better. amplitude modulation switch formed by our flux ktp has the contrast ratio of 150 : 1 and insert loss is 2. 5 % at 1064 nm. high quality optical pulse with 1 ns width was cut successfully by using an e - o modulator from a laser pulse with 50 ns width, this modulator had run for three years, and the crystal did n ' t blackened, it showed our low conductivity flux ktp can endure high modulation voltage for a very long time

    Ktp晶體的電光應用試驗表明:用離子交換法製作的電光導,其離子交換濃度、折射率變化符合餘弦誤函數,光學均勻性以及器件的溫度穩定性較好;製作的強度調制電光開關,消光比為150 : 1 ,對1064nm激光的插入損耗為2 . 5 ;製作的電光調制器用於激光脈沖整形試驗,從脈沖寬度50ns的激光脈沖削出脈寬1ns的高質量光脈沖,該電光開關經過長達三年多的使用,沒有出現晶體變黑現,說明本實驗的低電導率ktp晶體能夠耐受長時間的調制電壓。
  11. The buckle wavelength of mwcn can be correctly predicted with the present result

    結果很好地解釋了多壁碳納米管的屈曲長與經典預言偏很大的現
  12. Due to the advantages such as short response time, easy operation, and convenient to comprehend the wavefront modes, the hartmann wavefront sensor ( h - wfs ) is widely utilized nowadays in real - time adaptive optics system, turbulence statistical characterization, optical components test, light quality evaluation, laser atmosphere communication, the wavefront correction of ultrahigh power laser pulses, as well as human eye aberrations measurement. the detection accuracy is important to the performance of the whole optical system. considerable efforts have been performed in the investigation of h - wfs wavefront detection techniques in past years

    哈特曼前傳感器具有實時探測,易操作,可以直觀顯示前畸變分佈等優點,被廣泛地用作自適應光學系統的前信息探測和前畸變補償,大氣湍流統計特性表徵,光學元件檢測,光束質量評價,超強激光脈沖前整形,激光大氣通信以及人眼測量等各個領域之中,其探測精度的高低對整個光學系統的工作性能有著極其重要的影響。
  13. According to different water phenomena, we use two different method to produce waves source : the first method is by specifying the boundary conditions and initialization conditions, this method simulate the dam breaking, reflection and diffraction of water waves ; the second method is by specifying disturbance model, this method simulate water droplets, waterfall, waves of ship ; in the first part of this thesis, we discuss the prevalent methods of the simulation of water scenes, in the second part of this thesis, we describe the numerical methods of solving the shallow water equations using the finite difference method and the finite volume method respectively, in the third part of this thesis, we simulate some realistically liquid phenomena such as rain droplets, the waves of ship, dam breaking etc

    產生水首先要有源,設置不同的源便可以得到不同的水流情形,我們用兩種方法來產生源:一種是通過設置邊界條件和初始條件產生,這種方法用於模擬潰壩的反射、折射等現;另一種是通過擾動控制產生,這種方法用於模擬雨滴、瀑布、船等自然現。本論文的第一部分我們討論了目前水動畫模擬常用的幾種方法;在第二部分討論了我們所使用的兩類數值方法:有限分方法和有限體積方法;在第三部分我們模擬了雨滴、船、潰壩等一些水流現
  14. To guard against bias, each participant was identified according to a computer - generated random number, and a single radiologist performed all of the examinations

    為減少研究的誤,參與是次研究的對全部由電腦隨機分配編號,並由同一位超聲醫生負責所有的檢查。
  15. In chapter 2, some statistics models of radar clutters are investigated under the high resolution radar, and some relation between the input and output correlation coefficient of zeros memory nonlinearity ( zmnl ) are analyzed, then the fast numerical method ( called error controlled method ) which utilize calculating input and output correlation coefficient of zmnl is proposed

    第二章以高分辨雷達雜模擬為研究對,以零記憶非線性變換( zmnl )為研究手段,推演了幾種典型雜在zmnl變換前後輸入輸出間非線性變換關系,提出了求解輸入輸出非線性關系式的快速數值求解方法( 「誤控制」法) 。
  16. In general, the upward amplitude curve " curvature is larger, and it changes quicker. on the contrary, the downward is smaller and slower ; because the flare force contains the square of the wave elevation velocity, it results in an difference between the flare force frequence and the associated moving frequence ; the flare force decreases the downward amplitude of heaving oscillations ; the speed of ship has an ignorant effect on the peak values of three calculated values, but there is an obvious effect on the oscillating frequence ; the wave amplitude has an effect on the ship motion, and there is an linear relation between the oscillating amplitude and the wave amplitude on the whole. by the way, there are some experiences and lessons according to the progress calculation : before the calculation of the ship motion, we should checkout the balance in a calm water firstly, namely, the whole displace of ship and the longitudinal position of the center of gravity must be consistent with the draft in calm water, or else, the calculation may show the " floating " phenomenon ; the mixed language programming has a lot of virtues, but it exists a fatal limitation - the debug of dll

    研究表明:在某些頻率范圍內相關水動力系數基本不隨吃水變化,只有超過某一頻率后水動力系數的值才會出現異;在橫搖方向,水動力系數並沒有隨著吃水的變化發生規則變化,而是出現了動現;近船首剖面的水動力系數計算表明,水動力系數的動非常大,並遠遠偏離了平均位置的水動力系數值,值的變化速率也不盡相同,總的看來,上振幅曲線曲率較大,變化較快,下振幅曲線曲率較小,變化較慢;外飄力和面運動的速度的平方項有關,導致其振動頻率和相應運動方向的頻率不同;外飄力使升沉向下運動的幅值減小;船速對三個計算量的峰值影響甚微,但對振動頻率有明顯影響;幅對船舶運動的影響是明顯的,船舶運動的幅值基本上和幅成線性關系。
  17. In this paper, we design the imc controller using zero - pole cancellation method, and tune the controller filter parameter a according to the error e and its first difference a e and acquire the best combination between robust performance and the response speed. the error e is the difference between the reference model output and system output

    本文採用相消法設計內模控制器,用參考模型理想輸出和實際對輸出之e及其變化率e在線模糊調節控制器中濾參數,使系統的性能達到快速性和魯棒性的最佳結合。
  18. It can provide higher speed and alleviate the spectral degradation which usually goes with the existing algorithms, as well as constrain speckle noise of radar images. in respect of image fusion algorithm, the fusion rules and operators are essential. a new set of fusion rules and corresponding operators are given in this thesis

    實驗證明,在融合源圖特性異較大的情況下,該演算法與已有的基於小分析的遙感圖融合演算法相比較性能更優,具有運算速度快、減少光譜退化的特點,並能在一定程度上抑制相干斑噪聲。
  19. To the phenomena of prf - ambiguity, this paper discusses the method of prf - ambiguity resolving by wavelength diversity. simulation is made to analyze this algorithm

    對估計中會出現的模糊現,討論了異法解模糊,並進行了模擬。
  20. ( 5 ) discovered a abnormal law that the sonic velocity was enlarged with increasing of die core porosity in the sandstone reservoir of the haojiagou formation in triassic, and gave a geologic interpretation about the phenomenon. it was helpful to convert the sonic velocity into die porosity correctly in reservoir. ( 6 ) gave a primary reason for producing a little oil and gas in the well ha - 2 and ha - 3 of the sidaogou structure

    通過取心段地層巖性與聲測井速度分析,首次發現郝家溝組儲層段巖芯孔隙度與聲(聲速度)存在反常變化規律,並對這種現進行了較合理的地質解釋;提出了儲層預測中應注意的問題,首次提出在本區按常規方法利用聲換算孔隙度存在陷阱。
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