自由場發射 的英文怎麼說
中文拼音 [zìyóuchǎngfāshè]
自由場發射
英文
free field emission-
Since the discovery of cnt ’ s and find that cnts have small diameter and high length diameter ratio and can be look as one - demission material, it can be used as emission emitter of fed. especially, the aligned cnts array can be seen innumerable single cathodes which are lined regularly and form array. so growing aligned cnts array in selective area is the key technology to product cnts fed, which is also the necessary condition of cnts micro - electronics device
自碳納米管發現以來，由於碳納米管的直徑很小、長徑比大，故可視為準一維納米材料，可作為場發射平板顯示的尖端發射體，特別是定向碳納米管陣列可看成是無數根單尖陰極規則的排列起來形成陣列式，是理想的場發射平板顯示器的尖端發射體。In the absence of an appreciable magnetic field, the ensemble of nebular electrons interacts with ions to emit weak continuous radiation by free-free and free-bound transitions.
在不存在可觀的磁場時，星雲中的電子系綜與離子相互作用可通過自由-自由和自由-束縛躍遷而發射弱連續輻射。The shadow mask is the critical component of the colour picture tube and the important component for the choice of colour, its function concentrates on the limitation of electronics bound diameter and the screening direction, the electronics bound which is sent by the electronics gun goes scanning, during the scanning process, we should guarantee every bound gathering into the small holes situated on the screen, then these bounds will point to the regularized position through the small holes on the flat mask, and then three basic colours will be produced, at the same time, those useless electronics will be blocked by the mask board
平板蔭罩是彩色顯像管的關鍵部件之一，是一個重要選色元件，其作用是限制電子束直徑和上屏方向，由電子槍發射的電子束在偏轉磁場的作用下進行掃描，掃描過程中必須使每個電子束只能射中熒光屏上的為該束指定的那些小孔上會聚，並通過蔭罩上諸多的小孔分別打到各自對應的熒光質點上，發出三種基色（紅，綠，藍） ，而無用的電子則被蔭罩板截獲。( 2 ) the maximum of input - output ratio is strikingly promoted by the level of technical developing and unrestraint of resourses. and at the same time, it ’ s positively and distinctly influenced by the factors of natural resourses amount, techological support, govenment policies, labor supply, public foundation, intermediary service, maket overlay ( from high influence to low )
（ 2 ）集群的資金產出率的峰值（最大值）受到集群的自然資源非限制性、技術發展水平的影響顯著;同時也受到外部環境因素的明顯影響，由影響程度從高到低排序如下:自然資源、技術支撐、政府政策、勞動力供給、公共基礎、中介服務、市場輻射的提供能力。In the two - photon resonance case, part of the input pulse energy is transformed into higher and lower frequency components through amplified spontaneous emission and four - wave mixing, and the medium shows strong optical power limiting effect
在雙光子共振情況下，即入射脈沖頻率等於1 、 3能級之間的共振頻率的一半，由於介質中放大的自發輻射和四波混頻的作用，部分入射脈沖能量轉化為高頻和低頻電場成分的能量，分子介質表現出了很強的光功率限幅特性。We obtain a new quark potential from the effective dilaton - gluon - coupling inspired by superstring theory, and by using this static potential, we explore the mechanism of quark confinement through calculations of the spin - average energy levels, the widths of the leptonic decays and radiative transitions for heavy quarkonium. the obtained results are compared with that of the cornell potenial
由規范場理論的超弦理論所激發的伸縮子一膠子有效藕合，給出了一個新的靜態夸克一反夸克勢，討論了此勢模型下重介子的自旋平均能譜、輕子衰變和輻射躍遷寬度，並與cdrn叭勢模型所得到的相應結果作了比較Abstract : we have studied the spontaneous emission from a three - level atom with an external - driving field in a photonic crystal. as a result of quantum interference and photon localization, the population in the two upper levels displays quasi - oscillatory oroscillatory behavior. this depends on the initial atomic state and the relative positions of the two upper levels from the forbidden gap. the intensity and the phase of the external field can affect spontaneous emission from the atom. the properties are different from a three - level atom either in vacuum or in aphotonic crystal without an external driving field
文摘:討論了在雙光子驅動場作用下，三能級原子在光子晶體中的自發發射問題.由於量子干涉和光的局域化作用，兩個上能級中的占據數將具有周期振蕩或準周期振蕩的性質，這不僅依賴于兩個上能級與禁帶的相對位置，同時也依賴于原子的初始狀態，而且還與驅動場的強度、驅動場的入射位相有關.這些性質既與真空中帶有驅動場的原子的自發發射性質不同，也有別于無驅動場作用下光子晶體中三能級原子的自發發射性質The photo - induced phase transition of the different light intensities, photo - energies and directions of the polarized light is investigated. it suggested that the photo excites the down spin eg electrons and destroys the spin order system of the thin films. the relation between the he - ne laser reflectivity of the thin film, applied current and resistance was analyzed by the optics theory of solid state physics
光子通過激發e _ g向下電子的躍遷，從而改變材料自旋極化方向，影響體系的輸運行為；首次研究了cmr薄膜的激光反射率和偏置電流的關系，並用固體光學理論對其定性分析，表明反射率的變化是由於電場引起材料的晶格畸變，改變了極化率，從而導致材料的折射率和反射率發生改變。At present, the gas supply system is easily operated and controlled but not convenient for fault diagnosis and problem solving, and also not in favor of improving the reliability and safety of launch control because of lacking the working status and data from the automatic record equipment
目前發射場配氣系統採用手動控制方式，這種方式雖然簡單易實現，但由於沒有自動記錄設備的運行狀態和數據，不利於故障的定位和排除，也不利於提高發射控制的可靠性和安全性。The main work of the thesis is as follows : we design a novel omni - mirror more applicable in robocup, which is made up of an isomeric horizontal mirror and an isomeric vertical mirror and can make the resolution of the imaging of the objects near the robot on the field constant and make the distortion of the imaging of the objects far from the robot small in vertical direction ; we select a 1394 digital color camera and complete the development of its software program for data acquisition ; we design a image processing algorithm for the panoramic image, which can segment the image by color, extract the features of image fast and effectively and complete the recognization of target ; according the character of the imaging, we design a new fast hough transform algorithm for line detection, which can detect the white mark lines of the field realtimely, and then design a robot ’ s self - localization method based the mark lines, which only uses the information of omni - vision system ; finally we design a monte carlo localization method based on the information of omni - vision system and odometry, and present the localization results of two localization methods and analyze the experiment results and get the conclusions
本論文的主要工作如下:設計了一種新的更適用於機器人足球賽的全向反射鏡面，該鏡面由水平等比鏡面和垂直等比鏡面組合而成，能夠使機器人近處一定范圍內水平場地上的物體成像解析度不變，遠處物體成像高度上變形較小;選擇了一款基於1394介面的數字攝像機，並完成其數據採集程序開發;針對全景圖像設計了圖像處理演算法，能夠快速有效的實現圖像顏色分割和圖像特徵提取，完成目標識別;根據全景圖像的成像特性，設計了一種新的用於直線檢測的快速hough變換演算法，能夠實時的提取出場地的白色標志線，並在此基礎上設計了完全利用全向視覺信息的基於標志線的機器人自定位方法;最後設計了一種基於全向視覺信息和里程計信息的montecarlo定位方法，給出兩種方法的定位結果，並分析實驗結果，給出結論。The bigger the diameter, the high the heat efficiency, but the weak the temperature increasing ability, length has less effect on the heat efficiency, tilt angle has less effect on the flow field and temperature field while it is larger than 30 degree, vacuum degree and emissivity have great effect on the flow field and temperature field while there is a great temperature difference between the liquid in the tube and the surroundings, the furring has less effect on the heat transfer but should be cleaned up in 3 - 5 years because of poor water quality, the higher the solar flux or the more the temperature difference between the liquid and the surrounding, the more the heat loss and the lower the heat efficiency
分析了各種因素對太陽能真空集熱管流場和溫度場的影響。直徑越大，熱效率越高，但升溫能力弱；長度對熱效率影響不大；傾斜角度大於30后，自然對流已經能夠充分進行，考慮以能夠吸收到最大太陽輻射為主；真空度和發射率對熱效率和溫度場影響很大，尤其是在介質溫度與環境溫度差異比較大時；水垢對傳熱影響較小但由於水質的問題應該被3 5年清洗一次；太陽輻射強度越大，介質溫度與環境溫度差異越大，熱損失越大，效率越低； 4In large rotating machinery using filmatic bearing ( turbogenerator, air compressor, etc. ) there is a potential trouble from impefect installation or running conditions, a metals " contact between rotors and shells. the trouble is usully called rubbing. the advantage of ae technologe in the rubbing diagnosis and early detection is showed. instead of classical ae characteristic parameters ( counts, amplitude, energy, duration and the other ones ) a new feature extraction by frequency analysis of ae envelop signals is discussed. both research of ae process and field experements indicate that periodic components in the envelop spectrum related to rotational speed increase evidently at the beginning of rubbing production, hence are highly sensitive to the rubbing fault diagnosis. according to the new design an acoustic emission equipment for the rubbing diagnosis named buaa ae testing system is developed and described
汽輪發電機、空氣壓縮機等採用油膜支撐的大型轉動機械，由於安裝或運行中的原因，在轉子旋轉過程中，可能和器壁發生輕微的摩擦和碰擊，簡稱碰摩.聲發射技術在碰摩發生特別是故障早期診斷上有優越性.本系統的特點是沒有沿用傳統的計數、幅度、能量和持續時間等聲發射特性參數，而是在聲發射包絡信號的頻率分析中進行特徵提取.聲發射發生的過程分析和現場試驗都表明這種方法對碰摩檢測很敏感，在碰摩發生的起始階段，包絡譜中與轉速同步的周期性分量顯著增加.根據這種新的設計思想自行研製了buaa碰摩聲發射檢測儀並對此作了介紹As barium titanium is a typical ferroelectrics medium, in which the variation of the polarization intensity with the field strength is nonlinear under the external electric field. the behavior of microwave propagation in batio3 er fluids was also studied when considering the microwave propagation in a direction perpendicular and parallel to the particle chains, respectively. the microwave transmittance in the fluids could be adjusted by the electric field
考慮到batio _ 3是一種非線性介質，在外電場作用下自身介電行為變化的特殊性，對batio _ 3電流變液微波透射行為進行了研究，分別考慮微波傳播方向與電流變液顆粒鏈相垂直和平行的情況，發現batio _ 3電流變液微波透射率亦可由外電場調控。分享友人