An easy and fast way to determine the enantiomeric purity of substituted cyclanones

The determination of the enantiomeric purity of 2 or 3-substituted cyclanones, particularly cyclohexanones, is conveniently achieved by derivatisation into cyclic aminals with commercially available (R, R)-1,2-diphenylethylenediamine. The derivatisation procedure is directly done into the NMR tube, instantaneously, and ¹³C NMR allows an accurate measure of the ee.     

键座渗流与稀磁体系的相变

本文首先将键渗流和座渗流中的普适关系加以推广,建立了键座渗流的相界关系;接着研究了稀磁体系的相变问题,应用Potts模型,推出稀磁体系的铁磁-顺磁和反铁磁-顺磁相交的相界关系。与已往文献中处理这类问题所采用的级数法、有限集团近似、数值模拟和重整化群等方法相比,本文所给出的解析式具有使用方便、简单、物理概念清晰,且较为精确等优点.     

高浓度多链体系链动力学的Monte Carlo模拟——键长涨落模型和空穴扩散算法

本文在Larson的“键长涨落模型”的基础上提出了模拟高浓度多链体系的新算法。本算法具有如下特征:(1)除通常的微松弛模式外,还直接引入了链的Reptation运动;(2)提出了空穴扩散算法使体系随时间演化。由于本算法的这些新特征,克服了前人的算法不能运用于两维体系以及高浓度多链体系的缺点,同时也大大缩短了计算耗时。应用本文的算法,在44×44的元胞中模拟了链长为21,浓度为0.9545的体系的动力学行为。所得结果与Rouse理论的预言相符合。     

Monte Carlo Hamiltonian: Linear Potentials

We further study the validity of the Monte Carlo Hamiltonian method. The advantage of the method,in comparison with the standard Monte Carlo Lagrangian approach, is its capability to study the excited states. Weconsider two quantum mechanical models: a symmetric one V(x) = |x|/2; and an asymmetric one V(x) = ∞, forx ＜ 0 and V(x) = x, for x ≥ 0. The results for the spectrum, wave functions and thermodynamical observables are inagreement with the analytical or Runge-Kutta calculations.     

格值型Hahn-Dieudonné-Tong插入定理与层次结构

本文将关于半连续函数的Hahn-Dieudoné-Tong插入定理推广到值域为格L的惰形。我们是对格值半连续映射全体形成的拓扑进行考察,将这个问题归结为诱导空间的某种分离性问题来解决的。作为附产品,对相当广大一类格L,证明了诱导空间为正规当且仅当底空间是正规的。反例说明了对乙的限制的必要性。这些结果与反例说明诱导空间的正规性以及格值插入定理成立与值域乙的特征有密切关系。古典的插入定理的证明是分析式的且富有技巧性。与之相比,这里使用的称之为层次结构的新方法则相当朴素而自然。这方法基于对层次之间的拓扑关系有深入的认识。希望这种归纳地给出层次然后定出映射的方法还会得到进一步的应用。     

因子分析在企业竞争力评价中的应用

根据因子分析原理,建立了企业竞争力的规模因子、效益因子和成长因子得分模型。通过现实竞争力和潜在竞争力分析,实现了企业竞争力和可持续发展的评价。     

Multicommuted fluorometric multiparameter sensor for simultaneous determination of naproxen and salicylic acid in biological fluids.

A combined approach based on solid-phase optosensing and multicommutation principles has been applied to develop a method for the simultaneous analysis of two pharmaceuticals (naproxen and salicylic acid) in biological fluids. The multicommuted flow-through optosensor was based on direct native fluorescence measurements of both analgesics using a non-polar sorbent (C18 silica gel) as a solid sensing zone. The flow system was controlled by Java-written home-made software and designed using three-way solenoid valves for an independent automated manipulation of sample and carrier solutions. Using an optimized sampling time, the method was calibrated in the range of 1 - 25 and 5 - 200 ng mL(-1). The obtained detection limits were 0.3 and 1.3 ng mL(-1) for naproxen and salicylic acid, respectively, with RSD (%) values of better than 2% for both analytes. The proposed methodology was successfully applied to urine, serum and pharmaceutical preparations. Recovery percentages ranging from 96.1 to 104% were obtained for both analytes.     

集值映射的切导数与向量优化问题的最优性条件

利用集值映射切导数与半可微概念，给出了无约束与具约束的集值向量优化问题局部真有效解与局部强有效解的最优性条件。     

Rough隶属函数关于集合并与交的一种高精度计算方法

近些年来，许多处理近似问题的方法陆续被提出，其中利用Rough集理论计算两个集合的并和交的Rough隶属函数方法是被用较多的一种方法，但毕竟该方法精度较差。为此，介绍了一种精度较高的计算两个集合的并和交的Rough隶属函数方法，它克服了前者利用Rough集理论计算Rough隶属函数的复杂性，而迎来了简单和高精度的特点。