正交投影目标因子分析法及其在光度分析中的应用——稀土元素多组分混合物同时测定的研究

本文将奇异值分解法引入因子分析,较好地解决了由于矩阵亏秩引起的困难;并采用正交投影矩阵法实现目标转换,以相似性系数Q_ta作为新的目标检验判据,使计算结果得到改善.用本法测定并计算了La、Sm、Tm混合物的合成样品,获得满意的结果.     

用改进的因子分析-光度法同时测定含有锗钼钨锡的混合物体系

本文通过模拟纯谱及非零截距的引入,改进了因子分析-光度法。用该法探讨了以对硝基苯基荧光酮及溴代十六烷基三甲铵作为试剂的多元络合物体系同时测定锗、钼、钨、锡的最佳条件。实验证实用该法测定合成样品及钢样,结果满意。     

氨基酸原子电距矢量表达与核磁共振碳谱模拟

提出以原子电性距离矢量(VAED)描述20种天然氨基酸中不同等价碳原子的化学环境,结合γ效应校正与碳原子类型,建立核磁共振碳谱(¹³CNMR)化学位移(CS)的五参数线性模型.用于氨基酸分子中4类不同的等价碳原子化学位移的估计,复相关系数分别为R=0.9864,0.9513,0.9463,0.9567;均方根误差分别为RMS=0.5544,2.5232,11.3096,4.9098ppm经交互校验,模型稳定性较好.并综合几种处理方法,找到一种较好的建模方法,将它用于4个外部样本化学位移的定量预测,结果良好.     

图的1-因子、f-因子和(g,f)-因子

设G是一个图且有一个1-因子F,g和f是定义在V（G）上的非负整数值函数且对每个X∈V(G)有g（X）＜f(X)≤dG（x）,且f(v(G))为偶数．（i）若对每个xy∈F有f(x)=f(y)且G－{x,y}有一个（g,f)-因子,则G有一个（g,f)-因子;（ii）若对每个xy∈F有f(X）=f（y）且G-{X,y}有f-因子,则G有f-因子.     

Spin Factors as Generalized Hermitian Algebras

We relate so-called spin factors and generalized Hermitian (GH-) algebras, both of which are partially ordered special Jordan algebras. Our main theorem states that positive-definite spin factors of dimension greater than one are mathematically equivalent to generalized Hermitian algebras of rank two. S. Pulmannová was supported by Research and Development Support Agency under the contract No. APVV-0071-06, grant VEGA 2/0032/09 and Center of Excellence SAS, CEPI I/2/2005.     

Dynamic switching between binding sites in the complexation of macrocyclic ‘push-pull’ chromophores to lanthanides

The introduction of a 1,3-diacetylpyridine moiety, as an additional binding niche in a macrocyclic receptor ligand containing a conjugated, push-pull malonate functionality, leads to, in addition to the 1:1 binding stoichiometry, the equilibrium formation of multiple complexes, specifically 1:2, 2:1, and 3:1 ligand:metal complexes with lanthanide trications. Various binding modes elicit distinctive responses in the visible region, which enhance the potential recognition of lanthanide ions. This paper also highlights the usefulness of a full factor analysis in the elucidation of complex binding phenomena.     

Source Apportionment of Ambient PM10 in the Urban Area of Longyan City,China: a Comparative Study Based on Chemical Mass Balance Model and Factor Analysis Method

In order to identify the day and night pollution sources of PM10 in ambient air in Longyan City,the authors analyzed the elemental composition of respirable particulate matters in the day and night amb...     

并联交错PFC技术在磁体电源中的应用

并联交错功率因数校正(powerfactorcorrection,PFC)具有能减小输入电流纹波,减小电感磁芯尺寸,减小输出电容纹波、功率因数高等优点．针对其优点,考虑将该变换器应用到强磁场中心的超导磁体电源的备用方案中,以弥补现在运行电源体积过大的不足．本文主要介绍了并联交错PFC的工作原理,对其参数进行设计和选型,分析了控制方法,利用SiC器件,搭建了１kW 的实验样机,实验验证了方案的可行性,为下一步超导磁体电源的升级改造提供了理论和工程经验。