对光谱快速定量分析的探讨

通过固定光谱校准曲线,压缩光谱谱带间隙,可降低测试成本,工作效率提高1.5倍,分析质量准确可靠.     

荧光光纤光栅传感特性的实验研究

在载氢掺铒光纤上写入Bragg光纤光栅,得到新型光子学器件-荧光光纤光栅.分别对其Bragg波长（λB）及荧光寿命（τ）的温度（T）及应变（ε）响应特性进行了实验研究,并且给出了λB和τ分别关于（T,ε）的拟合方程.实验结果表明：荧光光纤光栅的λB对T和ε的响应具备一般Bragg光纤光栅的优良特性,测得温度灵敏度为11.1pm /℃,应变灵敏度为1.19pm/με;而且τ对T和ε的响应也具有良好的线性关系,温度灵敏度为0.59 μs/℃,应变灵敏度为6.16 ns/με.实验结论为解决温度应力交叉敏感、实现温度应力的同时监测提供一条新颖的途径.     

两性霉素B与鞘磷脂单分子层的相互作用

选取哺乳动物生物膜中的重要脂质分子鞘磷脂(SM)作为单分子膜的基本组分, 采用Langmuir-Blodgett(LB)膜技术研究了不同比例的两性霉素B/鞘磷脂单层膜的表面压力-平均分子面积(π-A)曲线以及基于π-A曲线的混合性分析, 同时通过原子力显微镜(AFM)研究了其表面形态的变化. 结果表明, 组分间的摩尔比和表面压力对混合单层膜稳定性、混合性以及分子间相互作用具有重要影响.     

热重分析技术及其在高分子表征中的应用

热重分析技术(TGA)是在程序控制温度和设定气氛下表征材料受热过程中的质量随温度或时间变化的高精度研究工具,具有重复性好、灵敏度高和热过程控制精准等优点.近年来,TGA技术在高分子材料领域得到了广泛应用,促进了高分子材料热稳定性、组成分析以及热分解机理等材料细观热响应特性的深入研究.本文分别从热重分析基本原理、仪器校准...     

内积在溶液浓度测定中的应用

提出内积的溶液浓度测定方法。该方法计算已知浓度溶液透光率曲线与0号溶液（浓度最低的溶液）透光率曲线的内积ρ,确定溶液的ρ-C曲线,然后测定未知溶液的透光率曲线,计算其与0号溶液透光率曲线的内积,并利用已建立好的ρ-C曲线进行插值以估计溶液浓度。由于该方法利用了透光率曲线的全部信息,因此对溶液浓度的估计精度较高。对K2Cr2O7溶液浓度的测定实验结果表明,该方法对溶液浓度的估计相对误差小于1.00%。     

Application of trilinear SLICING to analyse a single relaxation curve

Determining the time constants and amplitudes of exponential decays from relaxation data is a common task in LF-NMR. In this communication, we present an application of the SLICING algorithm to evaluate its possibilities for solving this problem. The method, originally introduced to compare different samples, is applied here to analyse a single relaxation curve, using the embedding technique. To test this procedure, we acquired data sets from samples of liquids properly separated, and characterized by different relaxation times. The results show a good estimation of parameters, comparable with those obtained applying Marquardt's algorithm, when the components have sufficiently different relaxation times.     

Chromatographic impulse response technique with curve fitting to measure binary diffusion coefficients and retention factors using polymer-coated capillary columns

The theoretical basis of a Gaussian-like approximate solution was applied to a chromatographic impulse response technique with curve fitting for measuring binary diffusion coefficients and retention factors using a polymer-coated capillary column. The formulae were derived for evaluating both the accuracy of the approximate solution and the sensitivity of the parameters. The validity of the solution also was confirmed experimentally for pulse injection of phenol in acetone into supercritical carbon dioxide flowing at 313.15 K and 11.6-28.6 MPa. Potential sources for experimental errors of the method are discussed.     

Plane quartics with Jacobians isomorphic to a hyperelliptic Jacobian

We show how for every integer one can explicitly construct distinct plane quartics and one hyperelliptic curve over all of whose Jacobians are isomorphic to one another as abelian varieties without polarization. When we say that the curves can be constructed ``explicitly', we mean that the coefficients of the defining equations of the curves are simple rational expressions in algebraic numbers in whose minimal polynomials over can be given exactly and whose decimal approximations can be given to as many places as is necessary to distinguish them from their conjugates. We also prove a simply-stated theorem that allows one to decide whether or not two plane quartics over , each with a pair of commuting involutions, are isomorphic to one another.

     

Meromorphic solutions of equations over non-Archimedean fields

In this paper, we give some conditions to assure that the equation P(X)=Q(Y) has no meromorphic solutions in all K, where P and Q are polynomials over an algebraically closed field K of characteristic zero, complete with respect to a non-Archimedean valuation. In particular, if P and Q satisfy the hypothesis (F) introduced by H. Fujimoto, a necessary and sufficient condition is obtained when deg P=deg Q. The results are presented in terms of parametrization of a projective curve by three entire functions. In this way we also obtain similar results for unbounded analytic functions inside an open disk.      

CS-800红外碳硫分析仪测定合金钢中的碳和硫

研究了碳硫分析在不同钨助熔剂加入量及不同分析时间的条件下所得碳、硫元素含量,首次结合分析曲线验证最佳条件,并对碳、硫分析可能存在的误差进行浅析.