求解辐射传递方程的离散坐标法

阐述了含吸收散射性介质三维空腔内辐射传递方程的离散坐标解法。讨论了入射散射项积分格式的选取,以及假散射和射线效应对解精度的影响。对三维矩形炉膛内辐射传递过程进行了数值模拟,并与区域法和离散传递法进行比较。比较结果表明离散坐标法具有较好的精度,是目前燃烧室内辐射传热过程数值模拟的一种较好的方法。     

二极管泵浦高能激光研究进展和展望

高能激光广泛应用于材料加工、科学研究、空间碎片清除、军事应用等领域。二极管泵浦高能激光具有结构紧凑,系统简单、全电驱无限弹仓的特点,近年来,各类二极管泵浦高能激光围绕着同时实现高功率、高效率、高光束质量这一总目标发展迅速。详细综述了国内外高平均功率块状固体激光、高功率可见光波段激光、高峰值功率激光、高功率光纤激光、碱金属蒸气激光等二极管泵浦高能激光的研究进展,并对其发展趋势进行了展望。     

啁啾高斯脉冲经啁啾光纤光栅反射后的传输特性

在考虑侈阶和高阶色散的情况下,给出了啁啾高斯光脉冲被啁啾光纤光栅反射后在光纤中传输时脉冲展宽的解析析式,。讨论了啁啾光栅脉减压缩和色散补偿中的几个重要问题。以线性啁啾光纤光栅为实例进行了数值计算,发现了脉冲殿宽的对称性质,最后提出一种新颖的可用于估算脉冲受光纤光栅作用后脉宽展宽的简单办法。     

Soliton interactions of integrable models

The solution of integrable (n+1)-dimensional KdV system in bilinear form yields a dromion solution that is localized in all directions. The interactions between two dromions are studied both in analytical and in numerical for three (n+1)-dimensional KdV-type equations (n=1, 2, 3). The same interactive properties between two dromions (solitons) are revealed for these models. The interactions between two dromions (solitons) may be elastic or inelastic for different form of solutions.     

新疆6种红景天属植物中微量元素和氨基酸含量分析

测定新疆6种红景天属植物的根及根茎中微量元素Na,K,Mg,Ca,Mn,Fe,Cu,Zn,Se和20种氨基酸含量,结果表明,9种微量元素在6种红景天根及根茎中含量中不同,6种红景天根及根茎中分别含有8－18种氨基酸,其中人体必需氨基酸3－7种。     

Cross-section measurement for the ~(93)Nb(n,2n)~(92g)Nb reaction at the neutron energy of 14.6 MeV by the AMS method

The cross-section for the~(93)Nb(n,2n)~(92g)Nb reaction has been measured at the neutron energy of 14.6 Me V using neutron activation and accelerator mass spectrometry(AMS)determination of the long-lived product nuclide~(92g)Nb.The neutron energy was generated from the D+T neutron source at the China Institute of Atomic Energy(CIAE).The neutron flux was monitored by measuring the activity of~(92m)Nb produced in the competing reaction channel of~(93)Nb(n,2n)~(92m)Nb.At the neutron energy of 14.6 MeV,the~(93)Nb(n,2n)~(92g)Nb reaction cross-section of(736±220)mb was obtained for the first time.     

基于缺陷接地结构的太赫兹双频微带天线

提出了一种工作在太赫兹频段的双频微带天线。在普通矩形微带天线的基础上,在辐射贴片上加载45°和135°的矩形贴片增大辐射面积,增大高频谐振点处阻抗带宽。通过引入缺陷接地结构使得天线在接地板处的电流路径改变,并与辐射贴片相互耦合,从而实现双频特性。为提高天线增益,在辐射贴片边缘加载若干寄生矩形贴片,并增加了寄生贴片处的基板厚度。该款天线可以同时在520 GHz(508~532 GHz)和680 GHz(581~766 GHz)的频段下工作,其中高频段的相对带宽达到了27.5%,最大增益达到了3.54 dB和4.11 dB。该双频天线结构相对简单,各项性能指标稳定,对于工作在太赫兹频段上的通信系统和无线传输系统具有一定的应用价值。     

Detection of the potential tumor marker of AFP using surface‐enhanced Raman scattering‐based immunoassay

The development of rapid, highly sensitive detection methods for α‐fetoprotein (AFP) is very important. As hepatocellular carcinoma is closely related to the level of AFP in the blood, it is necessary to maintain an AFP concentration below the safety limit. In this paper, we propose a universal, rapid, sensitive, and highly specific immunoassay system utilizing gold nanoparticles (AuNPs) and surface‐enhanced Raman scattering (SERS). This new system features a sandwich structure combining mercaptobenzoic acid‐labeled immunogold nanoparticles with the antigen and the antibody atop a pre‐designed substrate made of a glass slide modified with AuNPs. This SERS‐based immunoassay can detect AFP concentrations as low as 100 pg/ml, which is a significant improvement on the capabilities of the enzyme‐linked immunosorbent assay method. A good linear relationship between the SERS peak intensity and the logarithm of antigen concentrations (from 1 ng/ml to 100 ng/ml) was observed. This technique provides an effective model for the detection of biomarkers in medical diagnostics, criminal investigation, and other fields. Copyright © 2013 John Wiley & Sons, Ltd.     

非链式脉冲DF化学激光器反应动力学模型

依据非链式脉冲氟化氘(DF)激光器的反应机理, 采用速率方程理论, 综合考虑了基态DF分子、D₂分子、D原子、F原子对激发态DF分子的消激发作用, 建立了非链式脉冲DF激光器反应动力学模型. 运用Runge-Kutta法对该模型进行数值计算, 得到了增益区内各组分粒子数密度随时间的变化关系. 进而运用该模型研究了工作气体配比和输出镜反射率对DF激光器腔内光子数密度、 单脉冲能量、脉冲宽度和输出功率的影响, 得到了最佳气体配比和最佳输出镜反射率参数. 采用放电引发方式对非链式DF激光器进行了实验研究, 实验测得脉冲波形及单脉冲能量与速率方程理论模型计算结果基本一致. 本文的研究结果可为非链式脉冲DF激光器的优化设计提供理论参考. 关键词： 脉冲DF激光器 动力学模型 速率方程 数值计算     

High stability supercontinuum generation in lead silicate SF57 photonic crystal fibers

We report supercontinuum (SC) generation in a lead silicate SF57 photonic crystal fiber by using a 1550 nm pump source. The effective nonlinear coefficient of the SF57 fiber is simulated to be 111.5 W-1 ·km-1 at 1550 nm. The fiber also shows ultraflat dispersion from 1700 nm to 2100 nm. Our results reveal that with an increase of the average power of the incident pulse from 10 mW to 90 mW, the SC of the SF57 photonic crystal fiber is generated from 1300 nm to 1900 nm with high stability and without significant change in spectral broadening.