含萘荧光单体和聚合物的紫外和荧光分析

分别用紫外分光光度法和荧光光谱法对含萘荧光单体2-(甲基丙烯酰氧)-N,N-二甲基-N-(1-萘甲基)乙基氯化铵和相应的聚合物进行检测。在λmax=222nm下测定不同浓度的含萘荧光单体和聚合物的吸光度,线性相关系数均为0.9995。同时在λex=222nm和λem=332nm条件下研究两者的荧光光谱,样品浓度与荧光强度成良好线性关系,相关系数可达0.9998。对比两种分析方法表明,两者的荧光测定检出限相对较低,操作简单快捷,准确性和可行性高,可很好地监测水处理剂中聚合物的含量,从而实现水处理系统在线检测和自动控制。     

基于C~#的大学物理实验数据处理软件的设计

针对大学物理实验中部分实验手工数据处理＂难＂和＂繁＂的问题,利用C#开发设计大学物理实验数据处理专用软件,用于对实验数据进行数值计算和分析。教学实践表明,该软件使得实验数据处理过程简便,大大提高实验效率,实验教学效果良好。     

Cluster projective synchronization of complex networks with nonidentical dynamical nodes

We investigate a new cluster projective synchronization(CPS) scheme in time-varying delay coupled complex dynamical networks with nonidentical nodes.Based on the community structure of the networks,the controllers are designed differently for the nodes in one community,which have direct connections to the nodes in the other communities and the nodes without direct connections to the nodes in the other communities.Some sufficient criteria are derived to ensure the nodes in the same group projectively synchronize and there is also projective synchronization between nodes in different groups.Particularly,the weight configuration matrix is not assumed to be symmetric or irreducible.The numerical simulations are performed to verify the effectiveness of the theoretical results.     

The statistical properties of anisotropic electromagnetic beams passing through the biological tissues

We report the analytic formula of an electromagnetic Gaussian–Schell-model (EGSM) beam propagating through the turbulent biological tissues. With the help of this formula, the changes in characteristics of the beam such as the spectral density, the spectral degree of coherence, the spectral degree of polarization, and the spectral degree of cross-polarization of the EGSM beam passing through the biological tissues are illustrated and compared by numerical examples. The changes in anisotropic and isotropic EGSM beams are indicated. Necessary comparisons and analyses of the beams generated by the anisotropic source and the isotropic source through the turbulent biological tissues are given. Moreover, the influence of the light source and turbulence of tissues on the changes of the spectral degree of cross-polarization of the EGSM beam passing through the biological tissues are compared in the near-field and the far-field.     

Electromagnetic response of a compound plasmonic–dielectric system with coupled-grating-induced transparency

We propose a compound plasmonic–dielectric system consisting of one-dimension metallic gratings made of core–shell membranes and a Si grating waveguide with periodic grooves on one side, to investigate the coupled-grating-induced transparency (CGIT) effect. Both elements of the system can support certain resonant modes respectively, which have almost identical resonant frequencies but highly different quality factors, which are demonstrated by a theory model and the coupled mode theory. The electromagnetic response of the compound plasmonic–dielectric system induces coupling between these two types of gratings resonators and causes a transparency phenomenon due to the destructive interference of the resonant modes. The results show that the CGIT effect is associated with remarkable improvement of the group index corresponding to high transmission efficiency.     

Initial State Dependent Dynamical Behaviors in a Memristor Based Chaotic Circuit

Unlike conventional chaotic systems, a memristor based chaotic circuit has an equilibrium set, whose stability is dependent on the initial state of the memristor. The initial state dependent dynamical behaviors of the memristor based chaotic circuit are investigated both theoretically and numerically.     

Dual-Band Negative-Index Materials with Sandwich Configuration

Dual-band negative-index properties of the silver-SU-8-silver sandwich configuration, perforated with a square array of cross dipole apertures, are simulated and analyzed in the midinfrared region. The first and the second negative-index bands correspond to the （1,0） and （1,1） internal surface plasmon polariton （SPP） modes, respectively. The internal and external SPP modes acquired by the SPP dispersion relation of the metal/dielectric/metal model match well with the simulated transmission peaks. The effective parameters for the two negative-index bands are retrieved using simulated S parameters. The coupling effect between the （1,1） internal SPP mode and the localized resonance mode can be tuned by the arm length of cross dipole, which can weaken or destroy the negative electromagnetic response of the second negative-index band. The electric quadrupole mode of the second negative-index band accounts for its strong dependence on the dielectric loss of the interlayer.     

干旱半干旱地区湖泊周围盐碱土固体表面荧光光谱特征研究

荧光是由具有芳香结构或共轭生色团以及未饱和脂肪链的物质产生的,可以评价土壤腐殖化程度。该技术广泛用于检测土壤腐殖质水溶液荧光,很少用于直接检测土壤固体表面荧光。本文选取乌梁素海周围盐角草、碱蓬、盐爪爪和苦豆子群落的土壤作为研究对象,分别采集0~20,20~40和40~60 cm的12个混合土样,分析土壤固体表面荧光光谱特征,提出一个基于固体表面荧光光谱的土壤腐殖化指数(HIXSSF),并与I400/I360,I465/I399和A4/A1等常规腐殖化指数有显著的线性正相关。盐角草和碱蓬群落的HIXSSF比盐爪爪和苦豆子群落的小,并且随土层深度变化小。腐殖化指数与土壤盐度有显著的线性负相关,土壤腐殖化程度随盐度的减小而增强。HIXSSF不仅表征土壤腐殖化程度,而且表征土壤盐碱化进程。     

基于微控制器数字硬件实现的网格涡卷超混沌系统

基于微控制器(MCU)设计了一个通用的四维混沌系统数字硬件实验电路,由此实现了9×7网格涡卷的混沌和超混沌吸引子的生成.本文基于由Colpitts振荡器模型延伸出的四维多涡卷超混沌系统,通过引入单位锯齿波函数替换原系统中的三角波函数,构建了一个便于MCU数字硬件实现的新的网格涡卷超混沌系统,并对新系统网格涡卷吸引子的形成机理进行了分析和数值仿真.通过采用Euler算法对新系统进行离散化,在实验电路的有效动态范围内可以生成比原系统更多网格涡卷数量的吸引子.实验结果有效验证了本文基于MCU实现的网格涡卷超混沌系统的可行性.     

斯特林制冷机间隙密封冷量损失实验研究

传统的斯特林制冷机回热器使用接触式滑动密封,存在磨损,限制斯特林制冷机的使用寿命。间隙密封的应用则可以在完成密封作用的同时消除接触磨损和因此而产生的污染。但由于间隙内气体的泄漏,引起了冷量损失,使制冷量减少。设计了一套模拟实验装置,通过实验验证了回热器与气缸壁间隙内气体泄漏率及泄漏引起的冷量损失理论分析的正确性。