波前寬度 的英文怎麼說

中文拼音 [qiánkuān]
波前寬度 英文
duration of wave front
  • : 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...
  • : Ⅰ名詞1 (在正面的) front 2 (次序在先的) first; top 3 (過去的; 較早的) ago; before; preceding...
  • : 度動詞[書面語] (推測; 估計) surmise; estimate
  1. In all kinds of complicated network, oriented linking and unlinking, communication frequency resource is strained, and bandwith to transmitting audio frequency signal is too restricted, complicated and fluky, while audio frequency data exponential have been increased in the last several years. under the circumstances, based on the research of predecessor, this paper studies wavelet analysis ' s maths gist and practices significance on signal process, and puts forward a optimized wavelet package condensation arithmetic to process audio frequency data, which gives attention to coding efficiency, multirate and compression delay. simulation experiment on the arithmetic has been done by matlab

    針對無連接和面向連接的各種復雜網路環境下,通信頻帶資源緊張,音頻傳輸帶有限且復雜多變,而各種音頻數據又日益增多的局面,本文研究小分析在信號處理方面的數學依據和在數據壓縮方面的實際意義,在人不斷工作的基礎上,提出了一種優化小包變換編碼方案用於音頻數據的壓縮演算法,兼考慮了編碼效率、多碼率和壓縮時延多個方面,並在matlab環境下做了模擬實驗,對各種音頻信號及多種小函數做了模擬結果比較,實驗結果證明該演算法可以在一定計算復雜下可以很好地改進壓縮效果,達到多碼率下實現實時編解碼的過程,在高速dsp晶元等硬體設備支持下,可以有效應用於實際復雜多變信源編碼。
  2. So it is urgent to develop the wavefront engineering, and find a new technology to improve the resolution in photolithography

    因此,有必要拓工程學的研究內容,發展光刻解析增強新技術和新方法。
  3. This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. at first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu - lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band - pass filter, alternating amplifier, phase sensitive demodulatorn, pulse - width modulation, frequency scale circuit, moment current generator. finally, using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system, realized the testing functions

    首先對加速計及其測試技術的發展歷史和現狀,液浮擺式加速計的工作原理和數學模型等作了簡要的介紹,然後確定了以二元調脈沖再平衡測試迴路為設計方案,並從控制理論的角進行了分析,著重研究了系統中各部分的傳遞函數,利用系統開環傳遞函數分析了系統的穩定性,同時設計了系統的校正網路;分析了二元調脈沖再平衡測試迴路的解析、采樣約束以及測試精等基本問題,並按照系統分析的結果設計了包括置放大、帶通濾、交流放大、相敏解調、脈調制、頻標電路以及力矩電流發生器等測試系統各部分硬體電路,驗證了電路的正確性,最後按照測試系統的要求,採用了美國ni公司專為測試領域所開發的虛擬儀器工具? ? labview作為測試軟體開發工具,利用該圖形化編程語言完成了測試系統軟體部分的設計,實現了測試功能。
  4. Secondly, the effects of the crest width of the back - emf waveform to the torque ripple in the 120 ? conduction mode are analyzed, among which the effects of the advance commutation angle to the torque ripple are quantificationally analyzed for the bldcm drives whose back - emf waveform crest width is less than 120 ?,

    其次分析了120導通方式下反電動勢平頂對轉矩脈動的影響,對于平頂小於120電角的非理想梯形反電動勢,定量分析了換相超角對換相轉矩脈動的影響。
  5. The calculated results show that, for low energy protons ( energy less than several decade mev ), the contribution of proton nuclear reaction to energy deposition can be neglected ; while for high energy protons ( energy greater than several hundred mev ), the great difference appears for the above two cases. this gives us an indication that the contribution of proton nuclear reaction to the energy deposition must be concerned for high - energy protons. the propagation process in material of thermal shock wave induced by high - energy intense - current pulsed proton beam irradiation is calculated for several different proton energies

    對于入射能注量為418 ( j cm ~ 2 )脈沖為0 . 1 s的矩形脈沖強流質子束,計算結果表明,由於質子束能量不同,引起的初始熱激( 0 . 1 s時刻的熱激)有單峰結構,也有雙峰結構,不同能量的強流質子束引起的熱激在傳播的過程中都會出現明顯的彈性
  6. Due to the complexity of the structure and control of cycloconverter - type three - phase hf link inverter for soft - switching based on phase - shift - controlled full - bridge mode, a simple and optimized vvvf control strategy is proposed. this control strategy includes : produced pwm by space voltage vector ( svm ) and equivalent carrier frequency fe = 1 / te are introduced into the pdm control of the cycloconverter ; softened equivalent pwm wave is generated at the notches of hf voltage pulses ; the harmonious control between regulating pulse width by phase - shifted angle and regulating voltage of equivalent pwm is to minimize the harmonics content of output voltage of the inverter

    西安理工大學博士學位論文針對這種級移相全橋軟開關周變流型三相高頻鏈逆變器結構和控制的復雜性,提出了一種實現簡單而整體優化的vvvf控制策略:將空間電壓矢量產生p姍的方法svm和等效載頻率fe = 1 / te引入到周變流器的pdm控制;按高頻電壓脈沖後沿軟化等效p翎;用移相調節高頻脈沖和等效p姍調壓協調控制逆變器輸出電壓,在滿足輸出電壓條件下使諧最小。
  7. It has wide frequency width and high frequency relution. the maximum output frequency can get to 80m and the highest frequency relution can get to 1 u hz, the waveform memory is 64k. it has the important reference value for three classical structures - pc bus card, stand alone, vxi module

    該任意形發生器不僅能產生正弦,方,三角等常用的標準信號,還可根據用戶的需要生成任意形,具有頻帶,高的頻率解析等特點,其形最高輸出頻率可達80m ,頻率解析可達1 hz ,形最大存儲深為64k ,對于目三種典型的任意形發生器的結構? pc總線插卡式,獨立儀器, vxi模塊都有重要的參考價值。
  8. Simplicity to use and ease to real - time output etc. the quartz crystai microbaiance based on the response of mass change, is a sensitive mass sensor and very suitable to the detection of biomacromoiecuiar. now it is expected to find widely use in ciinic chemistry, pharmaceutics anaiysis, environmentai detection and so on

    而作為一種很有發展途的傳感器件,壓電體聲傳感器具有高靈敏響應譜、價格低廉、操作簡單及方便適時的輸出等優點;尤其是基於質量效應構制的石英晶體微天平具有很高的質量響應靈敏,特別適合生物大分子的測定而廣泛用於臨床化學,藥物分析,環境質量等諸多領域。
  9. The resort is situated in the center of the yalong bay national resort district, which has an extremely superior geographical position. surrounding the resort are beautiful, pristine ocean beaches along with the hongxia mountain and longtan lake

    酒店地處亞灣國家旅遊假區中心位置,鄰潔白綿延的沙灘和碧萬傾的大海,背依蒼翠欲滴的紅霞嶺和水面闊的潭湖,地理位置十分優越。
  10. Currently there are two typical spot - beam models with equal beamwidth and equal spotarea

    模型和等點束面積模型是兩種常用的點束模型。
  11. Because gyrotron traveling wave tube amplifier ( gyro - twt ) is an important millimeter wave amplifier with the characteristics of the high output power, the broadband width, and good efficiency, which has vast application vistas in many areas such as millimeter radar, communications, electronic countermeasure, and so forth, it has been pay much respect in the world

    迴旋行管是一種大功率、高效率、頻帶放大器,在毫米雷達,通信與電子戰等方面有十分重要的應用景,因而在國際上受到高重視。由俄羅斯人g . denisov等提出的螺旋導是一種比較理想的結構。
  12. 5. otherwise, the applicability of cube comer array in the wide spectrum high power solid - state laser facility was researched as a relatively absolute part in this paper. through simulation, the action of cube corner array to reduce beam ' s focal spot size was testified visibly, and the smoothing effect of beam ' s modulation caused by cube corner array was proved primarily on the wide spectrum condition

    另外,作為一部分相對獨立的內容,本文對頻帶激光傳輸條件下採用角錐棱鏡陣列抑制低頻畸變的設想進行了探索性的研究,通過模擬模擬驗證了角錐棱鏡陣列具有抑制低頻畸變、提高激光焦斑能量集中的顯著作用,並初步驗證了頻帶激光傳輸條件下近場振幅高頻調制的勻滑效應。
  13. The adaptive front - end has the adaptive ability for the magnitude and frequency of input signals. it can prefilter for the input signals, eliminate the useless signals, and improve the dynamic range of receiver system. it can lessen the burden of digital signal processing in the back - end of receiver, and improve the performance of receiver system

    自適應接收機端對輸入信號有自適應能力? ?頻率自適應和幅自適應,這樣的端就可將系統的接收中心頻率和帶自適應到輸入信號的頻率和帶,其實就是對輸入信號進行一次預分選、預濾,剔除對接收系統毫無作用的信號;同時對大信號自動減小增益,對小信號增加增益,提高系統的動態范圍;而且可以對干擾信號進行壓制。
  14. Next, the effects of the electron - beam quality on the characteristics of the vircator are investigated with simulation method. the simulation results show that the front edge of the beam pulse has almost no effect on the saturated microwave output, while good front edges can accelerate the saturation of the virtual cathode oscillation, and beam quality ( except its energy spread ) has almost no effect on microwave frequency, and so on

    結果表明:上凸形束脈沖沿可使虛陰極振蕩器達到飽和振蕩的時間縮短但對微飽和功率基本無影響;束流脈應足夠大,否則虛陰極振蕩器不能達到飽和振蕩(對應本文中的模型,束脈應大於16ns ) ;能散的影響不可忽視,當能散為5時,束轉換效率從單能束時的3 . 8降至1 . 5 ;束流質量(除能散外)對微頻率基本上沒有影響等。
  15. The millimeter has the largest frequency band and the highest velocity of communication, but it has the highest cost and technical defaults : multi - path effect, reflect and scatter caused by cloud, smoke, water - dropping, the buildings, the grounds and its shape, the interference caus ed by the thunder, the complexity of device, difficult maintenance, and so on. now the band of the leakage coaxial line is up to 3ghz, leakage coaxial line has some advantages : good adaptability to cloud, smoke, water - dropping, the buildings, the grounds and its shapes, good steady field, it has some technical defaults : lower resolution for location and measuring velocity, the more complex of its sending - receiving relay devices, weak anti - interference, the strict demand for the hole size in the line, the cleaner work environment and the higher cost

    毫米具有最大的帶和最高的通信速率,但也有最高的成本要求和較難克服的技術問題,即傳播的多徑效應,降水、雲霧、地形、地貌、建築物等的反射散射,打雷時的嚴重干擾,設備復雜,維護困難等等;泄漏同軸電纜的帶已做到3ghz ,具有對地形地貌建築物的適應性強,場強穩定,但它的定位測速精低,它的收發中繼設備較復雜,抗干擾能力低,電纜上的開槽有著嚴格的尺寸要求,工作環境要求清潔,成本較高;傳統無線感應技術具有結構簡單,成本低廉,維護方便,定位精較高的優點,但是,它沒有抗干擾能力。
  16. The results showed that quasi - isentropic compression energy waves were produced after the impact with mg - face of the flier - plate, whose initial velocity jump, peak velocity and front ' s rise - time were all different from the general shock loading wave profiles

    結果表明,梯飛片正向擊靶后產生的是陣面明顯被展的準等熵壓縮,準等熵壓縮的初始速跳躍、速峰值和陣面沿的上升時間都呈現出不同於傳統沖擊陡峭上升形的特徵。
  17. The project is to develop the 100mhz wideband digital storage oscilloscope ( wdso ) , typical performance character : input signal - 3db bandwidth is 100mhz, real time sampling frequency is 20msa / s, equivalent sampling frequency is 10gsa / s, resolution is 8bits, dual signal channel, and delicacy is 5mv 5v div per channel , time sweep velocity is 2. 5ns - - 5s div 。 so the project is provided with higher performance - to - price ratio, stronger competitive capacity in market and widest applied foreground at the area of wdso

    本次課題的具體目標是實現100mhz帶的數字存儲示器正樣機的研製,具體主要性能指標達到最高實時采樣率20msa / s 、等效采樣率10gsa / s 、被觀測信號3db模擬帶達100mhz 、采樣數字解析8bit ;雙通道,幅值靈敏: 5mv 5v div ,掃速2 . 5ns - - 5s div 。該方案具有較高的性價比,較強的市場競爭力和廣闊的應用景。
  18. It is found that : ( 1 ) for linear slope, redistribution of incoming energy flux in modenumber space depends on both the modenumber of incident waves and the ratio of the slope of incident wave ray to slope of topography ; both the transmitted and reflected energy flux ( only for supercritical linear slope ) focus near one or two modenumbers ; for supercritical linear slope, the energy flux scattering to higher modenumbers becomes larger and the energy flux to lower modenumbers becomes smaller as the slope of incident wave ray comes near to slope of topography ; ( 2 ) for convex slope, energy flux is redistributed in wide - range modenumbers and also show peaks on lower - modenubers and higher - modenumbers ; ( 3 ) for concave slope, energy flux is also redistributed in wide - range modenumbers, but does not show peaks on higher - modenumbers as supercritical linear slope and convex slope do ; ( 4 ) the total energy flux scattering to higher modenumbers is approximately equal to the total energy flux to lower modenumbers for internal waves propagating over both convex slope and concave slope, which means the concave slope is the same efficient to convex slope in scattering energy flux to higher modenumbers ; ( 5 ) for convex slope, the wave ray reflected from near - critical topography can extend to deep ocean and shallow shelf, while for concave slope, the wave ray reflected from near - critical topography can only extend to limited distance, then meet the topography and be reflected again ; generally the shear of the internal waves reflected twice from concave slope is not enhanced while the enhanced shear does also appear before second reflection takes place, the enhanced shear can bring about intense mixing, so internal waves reflected from concave slope can also produce marked mixing near critical slope

    3 、內在凹地形上傳播時,能通量在模態上的分佈范圍也比較,但與凸地形和超臨界線性斜坡地形相比,能通量在高模態上的分佈沒有明顯的峰值。 4 、從總的能通量來講,內在凸地形和凹地形上傳播時,向高模態散射的能通量與向低模態散射的能通若十地形下內傳播及內潮生成問題的理論解量近似相等,這意味著二者在向高模態散射能通量方面具有同等效率。 5 、凸地形上臨界點附近的反射,反射射線能夠延伸到深海和陸架,凹地形上臨界點附近的反射,反射射線很快遇到地形發生二次反射,一般來講二次反射后回到深海的動其速剪切並不很強,但是在進行二次反射之的區域,速剪切仍然很強,因而內在凹地形上的反射依然能夠在地形附近區域,產生強的速剪切區,誘發混合。
  19. Realizing the impact of chirp on the effect of carrier phase, some analytical expressions of chirped few - cycle pulses are also calculated, such as frequency gravity, pulse energy, center of gravity of time, effective pulse width, etc. results show that chirp makes the pulse characteristics more sensible to carrier phase, and chirp has greatly increased the pulse width when the carrier phase takes effect

    考慮到啁啾對載相位作用程的影響,導出了啁啾脈沖的頻率重心、脈沖攜帶的能量、脈沖時間重心以及有效等參量的解析表達式,分析表明,啁啾使得載相位比無啁啾的情況提起作用了,即啁啾在很大程上增大了載相位發揮作用所對應的脈范圍。
  20. The structure and character of deformable mirror were analyzed, and the conflict between the deformation band and the pitch of deformable cells was pointed out. the " two - time compensation " wave - front correct mode was introduced to settle that conflict. the method for allocating wave - front aberration and designing static corrector was found, and the " two - time compensation " wave - front correct mode was validated by simulation

    分析了變形鏡的結構特點,初步給出了變形鏡本身驅動單元數與校正量之間的制約關系;引入「二次補償」校正方案,解決了變形鏡校正量有限與高功率固體激光系統誤差起伏量大的矛盾,建立了校正對象優化分配、靜態校正器優化設計等細節過程所需要的方法,通過模擬模擬驗證了「二次補償」校正方案對于降低變形鏡校正量要求和放光學元件加工精的作用; 5
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