Frequency locking of propagating wave fronts in reaction - diffusion systems 反應(yīng)擴(kuò)散系統(tǒng)中波傳播的鎖頻現(xiàn)象
Summing up time harmonic propagated waves of all frequency gives the pulse propagation along the line 加總所有頻率成份弦波之時(shí)域傳播即得時(shí)域脈波之傳播。
Least fig . 3 be interpreted as the signature of zonally propagating waves , it is worth recalling what is said in the preceding chapter 為了使圖3不被解釋成緯向傳播的波的特征,有必要回顧一下前一章所論述的。
Based on the scalar diffraction theory and the boundary condition of rayleigh - sommerfeld , the accurate on - axis propagating wave function of plane wave diffracted by small circular band is obtained by solving the first integral of rayleigh - sommerfeld 摘要從標(biāo)量衍射理論出發(fā),采用瑞利索末菲衍射邊界條件,通過求解第一類瑞利索末菲衍射積分得到平面波經(jīng)圓環(huán)衍射后軸上的波函數(shù),進(jìn)而分析軸上的光強(qiáng)特性以及光強(qiáng)極值數(shù)量、位置和大小與衍射圓環(huán)內(nèi)外孔徑的關(guān)系。
It shows that the coaxial disk cylindrical waveguide with longitudinal ribs , which is one of large diameter , all - metal structure and allows for high average power capability , can improve the propagating wave ' s characteristics and gain a relative broad bandwidth by means of modifying the geometrical dimensions of the circuits 結(jié)果表明:脊加載盤荷波導(dǎo)是一種尺寸大,功率容量大的全金屬結(jié)構(gòu),在加脊后可以改善導(dǎo)波特性,提高帶寬。二、對(duì)脊加載盤荷波導(dǎo)注波互作用的線性理論進(jìn)行了研究。
The key components in laser gyro is he - ne ring laser , and the reciprocal action theory between light and medium is the base in studying the ring laser , use the lamb half classical theory , and on the base of density matrix theory , the optical brounch equation was established , which described the movement of amplifying medium atom in the ring syntonic cavity , and according to the medium polarize theory the self consistent equations was deduced , which describe the light intensity and phasic of the counter - propagating wave . on the basis of this equations , adopted the simulation software matlab and virtual instrument programming language labwindows / cvi , we can do some simulated experiments in study the phenomenas such as amplify and dispersive characteristic of medium , mode pushing effection , burned hole effection and pattern competition , lock - in of frequency and the characteristic of light intensity and phasic of the counter - propagating wave in laser gyro 激光陀螺的核心部件為he - ne環(huán)形激光器,而掌握光與介質(zhì)的相互作用理論是研究激光器的關(guān)鍵,采用拉姆半經(jīng)典理論為主,在密度矩陣?yán)碚摰幕A(chǔ)上,推導(dǎo)環(huán)形諧振腔中描述he - ne氣體增益介質(zhì)原子運(yùn)動(dòng)的光學(xué)布洛赫方程,運(yùn)用介質(zhì)極化理論得出描述激光陀螺反向行波的光強(qiáng)、位相所滿足的自洽場(chǎng)方程組,在此基礎(chǔ)上,運(yùn)用matlab仿真軟件和虛擬儀器編程語言labwindows / cvi ,對(duì)激光陀螺中的介質(zhì)增益色散特性、頻率牽引效應(yīng)、燒孔效應(yīng)及模競(jìng)爭(zhēng)、閉鎖效應(yīng)及環(huán)激光的光強(qiáng)和相位特性進(jìn)行仿真試驗(yàn)研究,并且運(yùn)用全量子理論,對(duì)激光工作原理進(jìn)行分析,得出二能級(jí)系統(tǒng)單模輻射場(chǎng)的光子數(shù)密度分布,得出激光場(chǎng)的光子統(tǒng)計(jì)分布,仿真激光場(chǎng)的動(dòng)態(tài)建立過程。
Multiple activation is that several piezodielectric ceramics are used as excitation sources , the neighboring piezoelectric discs used as sensors to record the propagating waves , and one piezodielectric ceramic act as both excitation source and response source , which can be used alternatively to form multipoint excitations and multipoint responses 多激勵(lì)是指用多個(gè)壓電陶瓷做為激勵(lì)源,而且每一個(gè)壓電陶瓷都可以同時(shí)作為激勵(lì)和響應(yīng),可以輪換使用,因此是多點(diǎn)激勵(lì),多點(diǎn)響應(yīng)。