From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先從一般的等效電路模型出發(fā)，根據(jù)Bloch周期性理論對該結(jié)構(gòu)的相移国产3p一区二区三区视频、衰減和阻抗特性進行了分析三级黄色一级视频,黄色一级视频，結(jié)果表明該新結(jié)構(gòu)具有類似帶通濾波器的特性：通帶內(nèi)衰減常數(shù)為零黄色一区二区三区网站，特性阻抗為實數(shù)并隨頻率連續(xù)平滑分布农村老熟女乱子视频，具有可任意指定的阻抗匹配帶寬看大黄片国产精品；帶外特性阻抗為純虛數(shù)，電磁波傳播受到抑制亚洲精品无码AV一二三四区。

The successful development of phase-shifting device provides a new method for the precise measurement of length, and especially for the measurement of single crystal silicon sphere's diameter which is under the application background of Avogadro Constant research.

該相移裝置的研制成功為精密長度特別是以阿伏伽德羅常數(shù)研究為應用背景的單晶硅球直徑的精密測量提供了一種新方法黄片在线播放中文。

The constant-NVT canonical ensemble Monte Carlo method has been used to simulate the phase equilibrium of linear molecule in this text.

本文用恒NVT正則系綜Monte Carlo方法模擬線性分子的相平衡特性。

In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

針對 Viswanathan K為消除普通BOOST DC／DC變換器的非最小相位特性而提出的三態(tài)Boost DC／DC變換器欧美性色欧美A在线播放秒播，為進一步提高這種電路拓撲的性能最新欧美精品免费A片在线播放，在建立了變換器狀態(tài)空間平均模型的基礎上，針對其多變量岛国艹在线、非線性特點，采用輸入輸出線性化將其轉(zhuǎn)化為一個完全可控的線性系統(tǒng)91手机91视频，在此基礎上應用現(xiàn)有成熟的線性控制策略進行了控制系統(tǒng)的設計黄色视频毛片在线看，并且采用MATLAB進行仿真驗證，結(jié)果表明：這種非線性控制策略可以確保輸出電壓在大范圍內(nèi)恒定可調(diào)日本特級片，且即使存在大范圍擾動(輸入電壓和負載變化均較大)的情況下ri99av，系統(tǒng)也可以確保穩(wěn)定性和良好的動態(tài)性能一级毛片,黄片。

This phase is performed at constant pressure and temperature; it produces significant work on the crankshaft.

這一階段是在不斷進行壓力和溫度；它產(chǎn)生顯著的工作曲軸国家一级无码黄片。

The effect of size and distribution of σ-Ni_3Nb phase on the fatiguefracture behaviour of Inconel 718 under constant controlled cyclic strain at 650℃has been studied.

本文研究了δ-Ni_3Nb相的尺寸及分布對Inconel718合金在650℃欧美性人妖XXXXⅩ极品，恒應變控制循環(huán)應變作用下斷裂行為的影響。

Recent experiments on the Si (111)(7×7)-(1×1) phase transition showed that when the temperature is raised above the critical temperature, a 7×7 island decays to zero at a constant area decay rate which increases with the size of the initial area.

近期Si(111)(7×7)-(1×1)相變的實驗研究發(fā)現(xiàn)亚洲免费人成视频观看，將溫度升高到相變溫度以上時国产人人夜夜，7×7島面積以恒定的衰減速率隨時間減小至零，且初始面積越大的島這個衰減速率就越大91久久精品无码一区二区毛片。

Using first order plug-flow reactor model, BOD5 removal rate constants of the whole wetland system were estimated to be 0.50 1/day (at 24℃) and 0.76 1/day (at 24℃) in the start-up and stable phase, respectively. These values were comparable to or even higher than the value of deoxygenation rate constant, 0.23 1/day (at 20℃), that is normally used in the river water-quality model.

由一階柱塞流反應器模式(first order plug-flow reactor model)估算人工濕地系統(tǒng)啟動階段及穩(wěn)定操作階段的BOD5去除速率常數(shù)平均分別為0.50 1/day(24℃)及0.76 1/day(24℃)A片在线观看网站免费不卡色欲，相當於或甚至高於一般河川水質(zhì)自凈模式中的BOD5脫氧速率常數(shù)的0.232 1/day(20℃)。

The diffraction efficiency of a phase grating is compared with that of an amplitude grating with same grating constant.

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Bonded joint was obtained by diffusion bonding at constant temperature and pressure, phase transformation superplastic diffusion bonding and diffusion bonding under pulsatile pressure. The strength of welding joint was tested and metallography of welding joint was observed.

采用恒溫恒壓擴散焊、相變超塑性擴散焊和脈沖加壓擴散焊實現(xiàn)了鈦合金和不銹鋼的焊接无码人妻精品一区二区不卡，測試了焊接接頭的強度二级黄A毛片免费视频观看，并對接頭進行了金相觀察。