Cu:KNSBN晶体中复色光自泵浦相位共轭猝灭实验及其理论解释

当用５１４.５ｎｍＡｒ^＋激光束入射到掺Ｃｕ的ＫＮＳＢＮ晶体中时，观察到典型的猫型自泵浦相位共轭，而当用５１４.５和４８８ｎｍＡｒ^＋激光束共线入射到该晶体中时，观察到自泵浦相位共轭猝灭现象．对这一现象给出了一个理论解释 关键词：     

Numerical anatomy of lock-release gravity current

IntroductionGravity currents, which are primarily horizonta1 flows and generated by a density differenceof only a few percent, are recognzed by rnore and more scientists fqr its importance in envi-ronmental and industrial flo.s[i]. NIany interesting'fiows such as sea water intrusion, turbiditycurrents. sandstorms, avalanches and pollutant outfalls can be tegarded as gravity currents\:.. ~ l'Lock.release gravity current, the most typical gravit1' current. is considered in this paper, as'a conti…     

Topological Analysis on Intermolecular Interaction of Two Ferromagnetic Organic Radical Compound

Electron density studies of two organic radical species, para-nitronyl-4-benzylideneamino-2,2,6,6-tetramethylpiperidin-1-oxyl, 1, and para-bromide-4-benzylideneamino-2,2,6,6-tetramethylpiperidin-1-oxyl, 2, have been carefully investigated by X-ray diffraction method at low temperature( 125 K and 100 K). They crystallized in the space group of Pnma and P21/c respectively. No phase transition is detected at the temperature range studied. Electron density distribution based on Multipole model will be presented. Electron density accumulation and the delocalized □-character found at C-C bonds of the benzene ring.     

Applied Physics A 52, no. 5 (1991)

Applied Physics A 52, no. 5 (1991)     

费米子Regge轨迹的解析性和阈行为

从π介子核子散射振幅出发,根据Mandelstam表示和么正条件,对于奇异量子数为零、重子数为1的费米子Regge轨迹,求得了下列结果:(1)位置参数α(s)的解析性,只有右方物理割而无左方动力割,但是左方有从s=0到-∞的运动学割。(2)当s<0时α(s)取复数值,并且还有一条同它成复共轭(在s<0范围内)的Regge轨迹。这一对轨迹它们的J-宇称相同,但是空间宇称相反。02时,α(s)为实数。不同宇称的轨迹对s的依赖不同。(3)讨论了费米子Regge迹在阈能(W₀=M+μ)附近的行为。凡是与共振态、束缚态有关的Regge轨迹,α(W₀)≠0。求得了在阈附近的表示,定性方面同玻色子轨迹相同。(4)还有一大类Regge轨迹,它们同共振态、束缚态无关,α(W₀)=0。这类轨迹在能量趋近阈能时,有无穷多个极点趋于ReJ=0(即我们在费米子情况下得到Gribov-Pomeranchuk极点凝聚现象),这类轨迹当能量由阈下趋于阈时,从J平面左半平面共轭成对趋于ReJ=0;当能量从阈上趋于阈时,成对地从第一和第三象限趋于ReJ=0。所有这些极点实数部分Reα→0比虚数部分Imα→0快一或二个数量级。J平面原点是一个凝聚点,这类“非动力”的Regge轨迹阈行为,无论对玻色子、费米子,以至非相对论势散射,定性都相似(只是凝聚的轴线和点不同)。它们实际上是s矩阵在阈的普遍性质的反映。