Coupled Optical Solitons for Pulse Propagation in Multi-Level Media

We investigate the shape-preserving propagation of N optical pulses in an （N ＋ 1）-level medium. We solve Maxwell-Schroedinger equations exactly and provide several types of explicit coupled soliton solutions, which are temporally amplitude- and group-velocity-matched multi-mode slow-optical pulses of the system.     

非线性传输线中的包络孤波

本文应用多重尺度微扰方法研究了双线或同轴传输线中传播波的非线性调制,导出了波振幅所满足的非线性schrodinger方程,并给出了包络孤波解,这对于电力传输问题的研究是有帮助的。     

激光热稳定腔的分析与设计

基于激光腔本征方程,分析了稳定腔的动态特性,提出热稳定腔的设计方法,给出满意的实验结果.     

THE SECOND HARMONIC RESONANCE FOR THE SHALLOW WATER SURFACE-WAVE IN A RECTANGULAR TROUGH

By using the perturbation method of multiple scales, this paper deals with the phenomenon of the second harmonic resonance for shallow water surface-wave in a rectangular trough. The results show that the envelope of the wave only depends on slowvariables of time. Eqs. of wave envelope are strictly solved and the results are discussed.     

N阶完全图K_N的t边着色

本文讨论的图都是简单图,即有限阶无圈、无重边的无向图.N阶完全图记为K_N,其顶点集合记为V(K_N),边集合记为E(K_N).设B、DV(K_N),B∩D=Φ.所有连接B的顶点与D的顶点的边的集合记为B×D,或D×B.设t是正整数,E_1,…,E_t是E(K_N)的一个分划.c_1,…,c_t表示t种不同颜色.把E_i中每条边都着以颜色     

ENUMERATION ON EXACTLY K-REDUCIBLE N-TOURNAMENTS

The formula for the number r~+(n,k)of all isomorphism classes ofexactly k-reducible n-tournamens and the formula on the number r(n,2)of allisomorphism classes of 2-reducible n-tournaments are obtained.By using theseresults,another formula on the number s(n)of all isomorphism classes of strongn-touruaments is established,which is represented by recurrence relations.     

一维更键Heisenberg铁磁链间隙非线性元激发

对于一维更键铁磁链Heisenberg模型，在一级近似下：1）存在磁间隙孤子（振动频率位于磁频谱间隙内）和响应扭结（振动频率位于磁频谱内）；2）内禀局域模（振动频率位于所有磁频谱带上方）是不可能存在的． 关键词：     

（2＋1）—Dimensional Envelope Solitons in a Disk—Shaped Bose—Einstein Condensate

We show that, due to the nonlinear coupling between a wavepacket superposed by short-wavelength collective modes and a long-wavelength mean field generated by the self-interaction of the wavepacket, the (2 1)-dimensional envelope solitons decaying in all spatial directions, i.e., dromions, are possible nonlinear excitations in a disk-shaped Bose-Einstein condensate with a repulsive interatomic interaction.     

漩涡辅助液液微萃取-气相色谱法测定水样中痕量多环芳烃

建立了漩涡辅助分散液液微萃取(VAEDLLME)结合气相色谱测定环境水样中12种多环芳烃的方法。对萃取剂种类和体积、漩涡时间以及盐浓度的影响等参数进行优化。实验结果表明,方法线性范围为0.1~5.0μg/L,相关系数r≥0.9851,检出限为0.001~0.01μg/L,加标回收率为95.0%~124.4%,相对标准偏差(RSD)为1.4%~27%。方法适用于环境水样中12种多环芳烃的分析检测。     

新型QuEChERS结合固相萃取-高效液相色谱法测定水产品中6种麻醉剂

建立了新型QuEChERS结合固相萃取-高效液相色谱法同时测定水产品中普鲁卡因、利多卡因、布比卡因、3-氨基苯甲酸乙酯甲基磺酸盐(MS-222)、苯佐卡因、丁卡因等6种麻醉剂的检测方法。样品用磷酸盐缓冲液(pH4.4)-乙腈溶液提取,增强型脂质去除净化剂(EMR-Lipid)净化,再经HLB固相萃取柱净化,高效液相色谱-二极管阵列检测器测定,外标法定量。结果表明,6种卡因类麻醉剂在0.20~10.00μg/mL范围内呈良好的线性关系,相关系数(R2)均大于0.9998;方法检出限(LODs)均为0.06 mg/kg,方法定量限(LOQs)均为0.20 mg/kg。3种不同添加水平下的样品加标平均回收率为71.8%~95.3%,相对标准偏差(RSDs)为2.3%~8.1%。