手性负折射率材料的最新进展

阐述了手性负折射率现象的产生机制;总结了近几年国内外手性负折射率材料在仿真模拟和实验制备方面的研究进展;分析了手性负折射率材料的旋光性、手性参数、损耗等;介绍了手性负折射率材料在各个领域的应用。分析认为,探索手性负折射率材料的新机制、新方法和新材料,从而在可见光波段实现负折射率是未来手性负折射率材料的重要发展方向之一。     

提高双参量光纤传感器精度的一种方法

分析了光纤传感器进行双参量测量时，系数矩阵的态性对待测量精度的影响，提出采用对系数矩阵进行预处理的方法，使得处理后的矩阵由病态变成良态。用方法对文献「４」和文献「５」给出的系数矩阵分别进行了处理。处理后，文献「４」系数矩阵的条件数从３４２降低到４，文献「５」系数矩阵的条件数从１６１降低到３，传感器输出不确定主降低了两个数量级。     

A General Theory of Non-Abelian Electrodynamics

The general theory of gauge fields is used to develop a theory of electrodynamics in which the fundamental structure is non-Abelian and in which the internal gauge field symmetry is O(3), based on the existence of circular polarization and the third Stokes parameter. The theory is used to provide an explanation for the Sagnac effect with platform at rest and in motion. The Sagnac formula is obtained by considering the platform in motion to be a gauge transformation. The topological phases can be described straightforwardly with non Abelian electrodynamics, which produces a novel magnetic field component for all types of radiation, a component which is proportional to the third Stokes parameter. The theory provides a natural explanation for the inverse Faraday effect without phenomenology.     

参数不确定的分数阶混沌系统广义错位延时投影同步

为进一步增强通信系统中保密通信的安全性,结合广义错位投影同步和延时投影同步,提出了广义错位延时投影同步.以分数阶Chen系统和Lü系统为例,针对两系统参数都不确定,基于分数阶稳定性理论与自适应控制方法,设计了非线性控制器和参数自适应律,实现了广义错位延时同步,并辨识出驱动系统和响应系统中所有不确定参数.理论分析和数值仿真验证了该方法的可行性与有效性.     

高含量氯化铷ICP-OES法分析测定

目前电感耦合等离子体发射光谱法(ICP-OES)常用于痕量或微量铷元素的分析, 针对常量组分铷的分析未见文献报道。通过样品用容量法连续稀释的方法测定常量组分铷离子含量时, 会引进较大的误差。本研究通过质量稀释和优化仪器参数的方法, 采用ICP-OES直接测定氯化铷溶液中的高含量铷, 减少了稀释次数和稀释引进的误差, 提高了分析结果的准确度。实验对铷离子的三条检测谱线的灵敏度、线性相关系数和测定结果的相对偏差进行分析, 确定铷的合适检测谱线为780.023 nm。实验发现ICP-OES仪器参数(雾化器流量、分析泵速和高频功率)对高含量铷的测定结果影响较大, 这是由于仪器参数影响雾化效率和谱线的发射强度, 进而影响铷的测定结果。通过正交试验分析各仪器参数对铷测定的影响顺序, 进一步依靠单因素试验确定较优的仪器参数。优化的仪器参数组合为雾化器流量0.60 L·min-1、分析泵速60 r·min-1、高频功率1 150 W。在优化的仪器参数条件下进行间隔一周的重复实验, 结果发现当RbCl浓度在0.09%～0.18%范围内时, 测定结果的相对偏差＜0.5%, 可以保证较高的准确度。当RbCl浓度为0.06%时, 测定结果的相对偏差为-1.7%。实验比较了高浓度氯化锂、氯化钾和氯化铷溶液ICP-OES法的分析测定, 在相近的仪器参数条件下氯化锂的测定结果优于氯化钾和氯化铷。本研究的ICP-OES方法操作简便且快速, 适合于含铷体系的相化学研究以及高含量铷产品的分析。     

中温沥青超声萃取物的热解特性与分子结构间关联性的FTIR解析

沥青分子结构和沥青热转化行为的调控是制备高品质沥青基炭材料的关键.为进一步明晰沥青热解行为与沥青分子结构间的关联性,选用8种有机溶剂对中温沥青(AGM P)在常温下进行超声萃取处理得到8种萃取物.利用PeakFit v4.12软件对各种萃取物的红外光谱吸收峰700～900,1000～1800,2800～3000和300...     

基于荧光动力学技术的黄渤海初级生产力快速测量

浮游植物初级生产作为海洋生态系统的重要起点,是海洋食物网的基础,是衡量海水质量的重要指标.为了准确测量、监测和预测浮游植物初级生产力的时空变化及其对外部环境条件的动力学响应,研究了一种基于叶绿素荧光动力学的测量技术,研制出响应时间为1.6 min、精度为4.86％ 的快速测量仪器.仪器测得的浮游植物初级生产力与液相氧电...     

On πd elastic scattering using aligned deuteron targets

A theoretical study is made of the advantages to be gained in polarizing a deuteron target by applying an external electric quadrupole field with non-zero asymmetry parameter for carrying outd(π, π)d experiments, in order to determine empirically the helicity amplitudes A, B, C, D characterizing the scattering, without any phase ambiguities.     

The pure rotational spectrum of ZnS (XΣ)

The pure rotational spectrum of ZnS (X¹Σ⁺) has been measured using direct-absorption millimeter/sub-millimeter techniques in the frequency range 372-471 GHz. This study is the first spectroscopic investigation of this molecule. Spectra originating in four zinc isotopologues (⁶⁴ZnS, ⁶⁶ZnS, ⁶⁸ZnS, and ⁶⁷ZnS) were recorded in natural abundance in the ground vibrational state, and data from the v = 1 state were also measured for the two most abundant zinc species. Spectroscopic constants have been subsequently determined, and equilibrium parameters have been estimated. The equilibrium bond length was calculated to be r_e ∼ 2.0464 Å, which agrees well with theoretical predictions. In contrast, the dissociation energy of D_E ∼ 3.12 eV calculated for ZnS, assuming a Morse potential, was significantly higher than past experimental and theoretical estimates, suggesting diabatic interaction with other potentials that lower the effective dissociation energy. Although ZnS is isovalent with ZnO, there appear to be subtle differences in bonding between the two species, as suggested by their respective force constants and bond length trends in the 3d series.     

内嵌富勒烯[M@C_(70)](M=Li,Na,K,Be,Mg,Ca)与[Mg(H_2O)_6]~(2+)相互作用的密度泛函理论研究

使用密度泛函理论方法,对内嵌多种碱金属及碱土金属原子(M=Li,Na,K,Be,Mg,Ca)的富勒烯C70与水合Mg(II)离子之间的相互作用进行了理论研究.首先对各原子(M=Li,Na,K,Be,Mg,Ca)嵌入C70后的形成能进行了讨论,之后计算了[M@C70]各体系与[Mg(H_2O)6]2~+的相互作用能,并采用自然键轨道理论(NBO)研究了电荷转移的情况,最后进行了电子密度拓扑分析.结果表明,内嵌原子半径越大,[M@C70]各体系的热力学稳定性就越高,转移至[Mg(H_2O)6]2~+的电荷也随之增加,二者之间的相互作用属于闭壳层相互作用及共价作用.