有限線寬 的英文怎麼說
中文拼音 [yǒuxiànxiànkuān]
有限線寬
英文
finite linewidth-
The signal we named it fundamental wave ; according to the fundamental wave, coefficients of the fundamental wave can be lined in a sequence. when the unique of the dissolve of the fundamental wave can be confirmed, the sequence of the coefficients can be regarded as one of representation forms of the signal itself ; theory of dissolvable signal shows that when order of the matrix of fundamental wave sampling equals to number of fundamental waves, the sequence of the sampling values from sampling points must be matched one by one with the sequence of the coefficients of fundamental waves. the sampling composed by sequences of the sampling values must be full sampling ; the relevant deductions of the theory of dissolvable signal shows that when sampling the signal, sampling frequency must be lager than the ratio of the number of fundamental waves to the occupation time of the fundamental waves ; to band - limited signals, when the fundamental wave is a sine signal, the results from the relevant deductions of theory of dissolvable signal is coherent to the classic sampling theory
本文通過分析認為，當信號集中的任一信號可表示為一系列已知信號的線性代數和時，信號集便構成可分解信號集，已知信號稱為基波信號；對可分解信號而言，基波系數構成一序列，當對指定的基波信號集分解唯一確定時，系數序列本身便是信號的一個表示；可分解信號采樣定理指出當基波樣值矩陣的秩等於基波數時，則由采樣點處的采樣樣構成的樣值序列必與基波系數序列一一對應，從而由該樣值序列構成的采樣必為完全采樣；可分解信號采樣定理中的推論指出，對信號集進行采樣，采樣頻率必須大於其信號分解的基波數與其對應時長之比；對有限帶寬信號，若基波信號為正弦信號時，由可分解信號采樣定理推論給出的結論與經典采樣定理一致。Implementation of the protocol overcomes the limitation of wireless bandwidth and high mobility, impro ves the performance and the destruction resisting capacity of the network
協議的實現充分考慮了無線通道的有限帶寬和移動性，提高了網路性能和抗毀性。For the reason of the restriction of the indefiniteness of network topology and the limitation of wireless medium bandwidth, the research in router protocols in manet is important and significant
由於網路拓撲結構的不確定性、無線介質帶寬有限等因素的制約， manet中的路由協議是其研究的一個熱點和難點。Emerson network power co., ltd. uses its industry - leading network power technologies, r & d, manufacturing, global marketing and service platforms, to supply the world with the most comprehensive end - to - end network power total solution
艾默生網路能源有限公司擁有業界最寬、最完整的網路能源產品線，擁有業界領先的網路能源技術、研發、產品製造及服務平臺。Adsl, is the most cost - effective technology recently, because it can utilize the existing loop line of pstn. lt is also the most popular one of the rbb ( residential broadband network ) technologies. the paper provides a scheme for user - side adsl access - - - - - - embedded adsl gateway
目前有著多種寬帶接入技術和方案可供選擇，其中adsl技術可以在不改變現有接入線路的情況下達到寬帶接入的目的，可以最大限度的利用現有的線路資源，是目前居民寬帶接入最受歡迎的一種。Through the analysis we found that the effect will become more obviously with the increase of thickness or width of superstratum and the decrease of the coefficient of foundation bed ; ( 3 ) anisotropy and nonlinear elastic f. e. m. model has been established and the effect of stress dispersion in compound two - layer foundation was analyzed on the base of the model. from the analysis we can conclude that the coefficient of subsidiary stress dispersion will amplify with the increase of thickness or width or stiffness of back - up coat ; ( 4 ) the formula which can be used in conventional calculation has been deduced for calculating the coefficient of subsidiary stress dispersion and it also has been affirmed to be reasonable through the checking calculation ; the whole theory of compound two - layer foundation has been brought forward in this paper and it ' ll enrich the theory of composite foundation
針對以上問題本文做了以下一些工作並得到若干結論： （ 1 ）提出了「復合雙層地基」的概念，並通過工程實例證明此概念的提出有其合理性和必要性； （ 2 ）用彈性地基梁理論證實了復合雙層地基確有應力擴散效應，且擴散效應隨上覆硬層厚度、剛度的增加而增大，隨下臥層基床系數的增大而減小； （ 3 ）建立了非線彈性、各向異性有限元模型，並以此為基礎分析了復合雙層地基的應力擴散效應，得到附加應力系數隨加固層厚度、寬度、剛度的增加而增大的結論； （ 4 ）推導了可用於常規計算的復合雙層地基應力擴散系數公式，並代入工程實例進行了驗證。Shenzhen advanced video info - tech co., ltd. ( avit ) established in year 2000, is a non - governmental, fast growing high - tech enterprise based in shenzhen
深圳市佳創視訊技術有限公司始終致力於有線寬帶網路的產品研發和集成。Though wide - band has been used widely, it ' s not wide enough to watch high - quality real - time video. futhermore, wiless communicaton has become a hot technology, it has limited band and unstable communication channel which result in high percentage of errorness in this situation, if people want to watch realtime video, it has high demand that video producer compress the video as small as possible when quality is good enough and receiver have ability of error resilience
另外，無線通信已經成為當前it領域的一個大熱點，對無線通信來說，帶寬就更加有限，並且傳輸線路不穩定，錯誤率高，在這種情況下，如果想通過無線網路在線觀看視頻，必然需要視頻發送端在保證質量的情況下對視頻進行盡可能的壓縮，同時提供強大的糾錯和抗錯能力。In february march 2000, ofta issued licences for the provision of local fixed networks using wireless technology to five companies, namely, hong kong broadband network limited, smartone broadband services limited, cct - teligent company limited, eastar technology limited and psinet wireless hong kong limited
電訊局在二零零零年二月三月發出牌照予5家公司，即香港寬頻網路有限公司數碼通寬頻服務有限公司cct - teligent company limited裕基科技有限公司和psinet wireless hong kong limited ，讓他們利用無線技術提供本地固定網路。In februarymarch 2000, ofta issued licences for the provision of local fixed networks using wireless technology to five companies, namely, hong kong broadband network limited, smartone broadband services limited, cct - teligent company limited, eastar technology limited and psinet wireless hong kong limited
電訊局在二零零零年二月三月發出牌照予5家公司，即香港寬頻網路有限公司、數碼通寬頻服務有限公司、 cct - teligentcompanylimited 、裕基科技有限公司和psinetwirelesshongkonglimited ，讓他們利用無線技術提供本地固定網路。In the terms of interpolation, the image reconstructed from nearest interpolation or linear interpolation has good edge but serious noise ; reconstruction from 4 * 4cubic interpolation or three b - spline or three - order lagrange interpolations has better local character. 2 x 2cubic interpolations which has both better edge and local character is the ideal interpolation, the following is the basic principle during reconstruction : ( 1 ) the more width of interpolation, the more number of summation and the more order of interpolation polynomial, the higher of density resolution ; ( 2 ) the more of interpolation polynomial and width of interpolation, the more of reconstruction time simultaneously, aimed at eliminating the effects of noise contained in projection data, in this paper, author analysis cause and effects of common artifacts. importantly, discusses convolution back - projection reconstruction algorithm with a shift axis of rotation has been derived for correcting images that acquired with a divergence axis of rotation using the fan beam geometry with an angle - equaled detector
在ct圖像重建時，選擇有限帶寬窗有較好的空間解析度，三角形窗有較好的密度解析度，選擇餘弦窗則使得空間解析度與密度解析度的折衷；從窗函數的頻譜角度來講，可以用於圖像重建的一個良好的卷積窗函數應該具備以下條件： （ ? ）小的3db帶寬b ，即最小的主瓣寬度； （ ? ）最小的旁瓣最大峰值a ； （ ? ）最大的旁瓣峰值衰減速度d ；就內插函數而言，臨近點內插與線性內插重建圖像噪聲大，但有較好的邊緣與細節； 4 4三次內插、三次b -樣條與四次拉格朗日多項式內插圖像平滑，局部特性較好。As an essential fitting for the suspended ceiling. the aluminum rim angle can be used as an omamental plece on the top of the ceiling. the product styles ronge from wood line, broad wood line, l shape, perforation type, and conventional type, to wshope, theapplication of rim angle ensures the uniform color of the ceiling and the leg of angle
鋁質邊角是天花吊頂配件的必備配件，也可以作為吊頂頂部的配飾。有木線，寬木線型， l型，打孔型，普通型w型等不同風格，並備有多種顏色可供選擇。盡最大限度確保天花與收角邊顏色一致。The system is stabilized against external disturbances. this means that the los is really pointing most of the time into a circle around the aim point because of stabilization loop finite bandwidth. the diameter of this circle represents stabilization accuracy
這是因為系統在抑制外來干擾而實現穩定時，由於穩定環有限帶寬的存在，瞄準線實質上是瞄準在目標中心點周圍一定的圓域內，該圓域的直徑反映了系統的穩定精度。Thousands of users must share the limited bandwidth on the same trunk line, which to the contrary also produces serious accumulated noises. in the worst case, even the analog phone service could not be offered
原因很簡單，成千上萬個用戶必須分享同一干線上的有限帶寬，同時在干線上還將產生嚴重的噪聲積累；嚴重情況下，甚至連模擬電話業務也難以提供。To the primary contradiction of real - time interactive visual simulation, limited bandwidth of network and real time transmitting parameter of relative to move sight, the control mechanism of 3 - d visual object is discussed, under the direction of hla idea, the visual federal object model vfom is established to describe the visual data distributing ; the author designed a grammar of vfom context and a turing conversion mechanism, it will support exploitation of visual simulation in different field ; the author analyses and apply opengl to design a method of implement real - time interactive visual simulation on pc, in additional with object - oriented program technique network communication technique multithreading technique, implement pc - virsp. there are 7 chapters in this thesis. in chapter 1, the developments of virtual simulation is looked back, the aim and significance and the main search content is put forward
論文針對實時交互視景模擬的主要矛盾，即網路有限帶寬與視景運動交互參數實時傳輸矛盾，探討了三維視體運動控制機理，結合hla思想，建立視景聯邦對象模型（ vfom - visualfederalobjectmodel ）來描述視景數據分佈；並設計了模擬實體鏈描述文本文法及其存儲轉換機制，有效支持多領域視景模擬系統開發；分析並應用圖形介面標準opengl ，設計了基於pc機的實時互操作視景生成方法；針對網路分佈環境下視景模擬實時交互需求，設計視景運動同步控制方案；並綜合應用了面向對象編程技術、網路通信技術、多線程技術，實現了基於pc機的視景實時互操作支撐平臺（ pc - vrisp ? real - timeinteractivesupportingplatformforvirtualsimulationbasedonpersonalcomputer ） 。The thesis analyzed the effects, associated with the propagation of laser in plasma channel, such as diffraction, plasma defocusing, the third - order intensity - dependent nonlinearity, the relativistic self - focusing, the focusing and defocusing of the plasma channel, and the absorbtion in the collision plasma and the finite pulse length effect
文中用哈密頓-雅可比方程方法和源展開方法分別對激光在等離子體隧道中傳輸所涉及的衍射效應、等離子體散焦效應、三階強度非線性、相對論自聚焦、等離子體隧道的聚焦和散焦效應、碰撞等離子體中的吸收效應、有限脈寬效應等等做了基本的闡述。Chapter 3 : the source - dependent expansion ( sde ) method for analyzing the wave equation is introduced, which is an effective method for solving the paraxial wave equation with nonlinear source terms. two examples have been given to explain this method, which are the propagation of the ultrashort intense laser pulses propagation in the partially stripped plasma in which the collisions of plasma electrons are taken into account, and the propagation including the finite pulse length effect
第三章：本章介紹了求解有非線性源項的傍軸方程的有效方法-源展開方法，並給出了兩個具體的例子，即考慮等離子體電子間碰撞的隧道傳輸的求解和考慮激光脈沖的有限脈寬效應的隧道傳輸求解。The analytical solutions of the gain, dispersion and population difference in the steady state of an open ladder lasing without inversion ( lwi ) system are at first given when the phase fluctuation of the driving field is considered. then the effects of the driving field phase fluctuation on the gain, dispersion and population difference are analyzed by the numerical results from the analytical solutions. our research shows that the phase fluctuation of the driving field will results in a finite line width ; with the line width increasing, the gain decreases monotonously, however, variation of the dispersion isn ? t monotonous, it has a maximum value when the line width takes some value ; the line width varying can ? t lead to change lasing from without to with population inversion
給出了有驅動場位相漲落的開放的梯型無粒子數反轉激光（ lwi ）系統增益、色散和布居數差的定態解析解，進而用得到的數值計算結果分析了驅動場位相漲落對增益、色散和布居數差的影響.研究結果表明，驅動場位相漲落將導致有限線寬;隨著線寬的增加，系統增益單調地減小，但系統色散的變化並不是單調的，當線寬取某個值時，色散有極大值;線寬的變化不能導致無反轉激光向反轉激光的轉變The technology of digital beamforming ( dbf ) can dramatically increase array antenna performances. these performances include fast adaptive pattern nulling, ultra - low sidelobes, closely spaced multiple beams, adaptive space - time processing, high resolution direction fiding ( df ) and increased capacity for band - limited communications systems
數字波束形成（ dbf ）技術可顯著提高陣列天線的性能，這些性能包括：快速自適應波束置零、超低副瓣、密集多波束、自適應空時處理、高分辨測向和大容量有限帶寬通信等等。Chapter 1 introduces the important role of mobile communication in communication field, and points out the significance for promoting the research work of guaranteeing qos ( quality of service ) using modern radio resource management techniques with limited bandwidth
第一章介紹了移動通信在通信領域的重要位置及其發展過程，以及移動通信中無線資源管理涉及的各項技術在有限帶寬條件下為盡可能多的用戶提供業務質量保障的重要意義。分享友人