聲子發射 的英文怎麼說
中文拼音 [shēngzifāshè]
聲子發射
英文
phonon emission-
The acoustic emission also shows a decreasing rate, following the drop in stress-intensity factor.
隨著應力強度因子的下降，聲發射也隨著減少。For micro - cavity semiconductor laser, station model is proposed in this paper and its steady - state and instantaneous characteristics when the coupling efficiency of spontaneous emission into a lasing mode is equal to 1 are analysised. for current noise, sp noise, noise, p noise, as well as current modulation, sp modulation, modulation and p modulation, using small - signal approximation, we derive the laser ' s corresponding transfer functions. and we calculate their signal - to - noise ratio ( snr ) gain in various parameters through frequency domain analysis in the premiss of large input snr
本文對于微腔半導體激光器，提出站模型，能夠較直觀簡潔地分析微腔半導體激光器的穩態和瞬態特性，利用此模型對具有重要實用價值的= 1的微腔半導體激光器進行了討論；對于電流i噪聲、自發發射壽命_ （ sp ）噪聲、自發發射因子噪聲、光子壽命_ p噪聲，以及電流調制、 _ （ sp ）調制、調制、 _ p調制，在小信號近似下，得到了相應的激光器的傳遞函數；在大信噪比的前提下，對激光器進行了頻域分析，分別計算了它們在不同參數下的信噪比增益，分析了其抗噪聲性能。Blackbird produces a pistol in reaction to my movement and fires several shots. the sounds the bullets make as they rip the air next to my ear give away the identity of his ammunition. cop - killers
山鳥類生產對我的運動反應的一把手槍而且點火一些注射。聲音當他們撕開緊鄰我的耳朵空氣的時候，子彈發出分送他的軍火身份。警官-凶手。Zno film is a novel - direct compound semiconductor with wide band gap energy of 3. 37ev and a exciton binding energy 60mev at room temperature. due to its the prerequisite for visible or ultraviolet light emission at room temperature, it has the tremendous potential applications for ultraviolet detectors, leds, lds. zno thin film is used widely and effectively in the fields of surface acoustic wave devices, solar cell, gas sensors, varistors and so on because of its excellent piezoelectrical performance
室溫下禁帶寬度為3 . 37ev ，激子束縛能為60mev ，具備了室溫下發射紫外光的必要條件，在紫外探測器、 led 、 ld等領域有著巨大的發展潛力； zno薄膜以其優良的壓電性能、透明導電性能等使其在太陽能電池、壓電器件、表面聲波器件、氣敏元件等諸多領域得到廣泛應用。The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker, and establishes a radar signal simulation model, including radar emitting signal model, receiving signal model, receiving echo signal model, clutter model, noise model, sum channel directional pattern of antenna model, difference channel directional pattern of antenna model, sheltering model, rcs model, glint noise model, etc. the second section studies signal processing of pulse doppler radar seeker, and establishes radar signal processing mathematical model and data processing mathematical model for simulation, including windowing, doppler filtering, envelope demodulation, pdi, cfar, centering, velocity tracking, angle tracking, a - b filtering, etc. the third section studies the modeling of modified proportion guiding, and establishes guiding model, then dynamic simulation results is provided
論文的主要工作包括四部分：第一部分研究了脈沖多普勒雷達導引頭的信號建模問題，建立了雷達信號模型，主要包括：發射信號模型、接收信號模型、目標回波信號模型、雜波模型、噪聲模型、和差通道天線方向圖模型、遮擋因子模型、接收機噪聲模型、目標雷達截面積統計性模型、目標角閃爍模型等。第二部分研究了脈沖多普勒雷達導引頭的信號處理模式，建立了信號和數據處理模型，主要包括：加窗和多普勒濾波、包絡檢波、檢波后積累、頻域cfar處理、速度定心、速度跟蹤、角跟蹤、 ?濾波等，然後給出了信號處理流程。Ae signals released from different lay - ups composite specimens were acquired by a wideband transducer, and fracture surfaces of the specimens were observed by scanning electron microscope ( sem )
寬帶傳感器記錄了不同角度纖維鋪層的復合材料試樣在拉伸破壞過程中的聲發射信號，用掃描電子顯微鏡（ sem ）觀察了試樣的幾種典型的損傷破壞斷面，對比分析了不同類型的損傷機制。Theory of semiconductor 、 absorption 、 direct transition 、 indirect transition 、 emission 、 radiation recombination 、 iradiation recombination 、 donor 、 acceptor 、 exciton 、 phonon 、 photon 、 polarition
半導體基本原理、吸收、直接躍遷、間接躍遷、輻射、發光復合、非發光復合、施子、受子、激子、聲子、光子、恆化子。Aiming at the problems in the orientation, evaluation anj the testing system, in order to develop the ae source orientation technology, research the testing system fitting to the situation of our country, we carry out the study of new type of acoustic emission testing and technology of ae sources orientation with advanced electronics and computer technology, at the same time, carrying out the research of aptitude evaluation technique, get realization of convenience and visibility of ae technology
針對目前檢測系統存在的差距和定位、評定技術的問題，本文結合先進的屯子技術及計算機技術，以期研究出符合本國國情的聲發射檢測系統，並改進聲發射定位方法、模式，同時開展智能評價技術研究，真止實現聲發射檢測的方便性利可視性。因此，開展新型聲發射檢測系統與定位技術研究只有重要的理論意義與實用價值。He shot another arrow, and this time the ape didn ' t dodge - - it snatched the arrow out of the air ! then it sniffed the arrow contemptuously before breaking it in two
他又射了一箭，這次猿猴沒有躲，他在空中接住了箭！它輕蔑地用鼻子發出嗤嗤聲，然後將箭折成兩段。According to the raman selection rule and the pl measurement, it is reasonable to evaluate the quality of galnp / algalnp mqw by analyzing the relative intensity ratio of a1p - lo / to. ( 4 ) a new modified random element isodisplacement ( mrei ) model is set up to calculate the dependence between the long - wavelength optical phonon frequencies and the composition of iii - v - type ab1 - xcx mixed crystals. the second neighbor force constants are still assumed to be a linear variation with the composition, but the two first neighbor force constants can be evaluated to be a negative exponent variation with the composition, using the overlapped repulsive potential of the ion crystal combination
通過實驗我們找到了在這些結構參數上生產gainp algainpmqw的較理想的結果； （ 3 ）首次用喇曼（ raman ）散射方法研究了常溫下的gainp algainp多量子阱結構，除了指認出喇曼光譜中各光學聲子模外，還結合樣品光致發光譜的測量結果，分析發現喇曼光譜中alp - lo to的相對強度比可以在一定程度上評定晶體gainp algainpmqw的生長質量； （ 4 ）在修正的隨機元素等位移? mrei模型的基礎上建立了一個新模型，計算了ab _ （ 1 - x ） c _ x型?族半導體混晶的長波長光學聲子模頻率的組分變化關系。The installation method of the inputting type ultrasonic is flexible. the vibrator can be installed on the bottom of the channel to make the ultrasonic wave radiate upward ； it aslo can be installedon the side of launch ultrasonic wave towards the sides. when the standard type ultrasonic washer is not able to reach the washing reault, the inputting type ultrasonic vibrator can be adopted to make washer which can meet different washing demands
投入式超聲波振子安裝方式靈活，振子可以安裝于槽底，使超聲波向上輻射，也可以安裝于側面向側面發射超聲波，當標準型的清洗機不能達到清洗要求時，就可採用投入式超聲波振子，製造能適應各種不同清洗要求的清洗機。The installation method of the inputting type ultrasonic is flexible. the vibrator can be installed on the bottom of the channel to make the ultrasonic wave radiate upward ; it aslo can be installedon the side of launch ultrasonic wave towards the sides. when the standard type ultrasonic washer is not able to reach the washing reault, the inputting type ultrasonic vibrator can be adopted to make washer which can meet different washing demands
產品說明:投入式超聲波振子安裝方式靈活，振子可以安裝于槽底，使超聲波向上輻射，也可以安裝于側面向側面發射超聲波，當標準型的清洗機不能達到清洗要求時，就可採用投入式超聲波振子，製造能適應各種不同清洗要求的清洗機。A unified theoretical model was given considering thermal activation, phonon - assisted absorption and nonradiative energy transfer processes. ( 6 ) the relationship between the fluorescence and the composition in niobate - silicate and niobate - phosphate glasses was studied
考慮熱激活、聲子輔助吸收過程與溫度猝滅建立了穩態動力學方程並對樣品熒光發射強度隨溫度的變化關系進行了量化解釋。If it is possible, the rooms for gc, icp, icp - ms should have a buffer area for gas cylinder cabinet and noisy compressor storage ; thereby the buffer room will keep the inner area of the room clean
建議有條件的情況下，氣相色譜、等離子體發射光譜、等離子體質譜也應建立緩沖間，緩沖間用來放置安全氣瓶櫃和有噪聲的壓縮機以及保持清潔） 。It has broad application prospect in the following fields such as microelectronics, photoelectronic devices, large screen flat panel display, field emitter array, acoustic surface wave device, photon crystal, light waveguide array, holographic honeycomb lens and micro - optical element array, micro - structure manufacture, fabrication of large area grating and grid of high resolution, photoresist performance testing, profile measurement and metrology, etc. the paper only involves the primary research of interferometric lithography
在微電子、光電子器件、大屏幕平板顯示器、場發射器陣列、表面聲波器件、光子晶體、光波導陣列、全息透鏡和微光學元件陣列、微結構製造，高分辨、大面積光柵和網格製造，在抗蝕劑性能測試、面形測量和計量等領域，干涉光刻技術都具有廣闊的應用前景。As result, a new method is presented by using the acoustic emission ( ae ) signal from stem of individual plant as its demand information. based on virtual instruments technique, which is becoming a popular tool in measurement and automation fields international, a computer - based detecting system is developed for the fast, real - time measurement. take tomato crops for testing example in greenhouse, the relation between ae and transpiration, environmental factors has been studied
因此，從植物本身出發，本文在國內首次採用了以植株莖部聲發射信號作為農作物需水信息的新方法，運用目前在測控領域國際流行的虛擬儀器技術，建立了對作物植株莖部聲發射信息進行實時、快速測量的微機檢測系統，並以溫室盆栽番茄為對象，研究了聲發射信息同植物蒸騰以及環境因子間的關系。Company produce the high quality remote controls and also produce other electronic products such as amplifier, filter, usb remote and receiver set, telephone amplifier, video transceiver and so on. the factory adopts a high standard control management and is supported by a world - class research team
除萬能遙控器外本公司也生產多項電子產品：擴大機電視訊號濾波器聲音無線傳輸電話擴音器電子安定器人體感應器發射接收器設計製造生產等。According to the seismic convolution model, a kind of matched filters in time - scale domain is designed for echo signal detection of ground penetrating radar ( gpr ) and implemented in this paper, which is applied to detect the location and amplitude of single reflection wavelet in receiving signal through continuous wavelet transform
摘要根據地震褶積模型，設計並實現了應用於探地雷達回波信號檢測的時間尺度域匹配濾波器，利用小波變換的時間定位性和尺度伸縮性，檢測出雷達接收信號中單個反射子波的位置與強弱信息，利用已知的雷達發射子波模型還原回波信號，達到了濾除噪聲、最佳接收的目的。The sounds and images are converted into electrical signals by a microphone ( sounds ) or video camera ( images ), amplified, and used to modulate a carrier wave that has been generated by an oscillator circuit in a transmitter
聲音合圖像由話筒（聲音）或攝像機（圖像）轉換為電子信號，經過放大后，用來調制發射器中一個振蕩器產生的負載電波。In 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分享友人