校正变换矩阵法用于多组分染色剂的同时测定研究

将校正变换矩阵法(CTM)与可见分光光度法相结合,对藏红、荧光桃红、曙红三种染色剂进行不经分离同时测定.使用交叉验证法选择主因子数建立了校正模型,预测结果令人满意.在相同条件下,将校正变换矩阵法与偏最小二乘(PLS)回归的结果进行了比较,结果表明两种方法的预测准确性没有显著性差异.     

Stolz定理及其推广

Stolz定理是证明数列和函数极限存在性的重要定理，文中给出了Stolz定理的数列情形，函数情形，级数情形，并用函数论方法，将这几种情形加以推广，得出更广泛意义的结论。     

Exact Computation of Parallel Robot＇s Generalized Inertia Matrix

According to the definition of the new hypothetical states which have obvious physical significance and are termed as no-gravity static and accelerated states, a method for exact computation of the parallel robot＇s generalized inertia matrix is presented. Based on the matrix theory, the generalized inertia matrix of the parallel robot can be computed on the assumption that the robot is in these new hypothetical states respectively. The approach is demonstrated by the Delta robot as an example. Based on the principle of the virtual work, the inverse dynamics model of the robot is formulized after the kinematics analysis. Finally, a numerical example is given and the element distribution of the Delta robot＇s inertia matrix in the workspace is studied. The method has computationa＇, advantage of numerical accuracy for the Delta robot and can be parallelized easily.     

关于二阶分块矩阵的结构化预处理子的构造和分析

For the large sparse block two-by-two real nonsingular matrices, we establish a general framework of structured preconditioners through matrix transformation and matrix approximations. For the specific versions such as modified block Jacobi-type, modified block Gauss-Seidel-type, and modified block unsymmetric (symmetric) Gauss-Seidel-type preconditioners, we precisely describe their concrete expressions and deliberately analyze eigenvalue distributions and positive definiteness of the preconditioned matrices.Also, we show that when these structured preconditioners are employed to precondition the Krylov subspace methods such as GMRES and restarted GMRES, fast and effective iteration solvers can be obtained for the large sparse systems of linear equations with block two-by-two coefficient matrices. In particular, these structured preconditioners can lead to high-quality preconditioning matrices for some typical matrices from the real-world applications.     

整系数线性方程组的整数解的判定

文章主要研究求整系数线性方程组的整数解的一般方法.借助于整系数线性方程组的简化形及其系数矩阵和增广矩阵的行列式因子,建立了整系数线性方程组有整数解的两种判定方法,并利用第二种判定方法证明了多元一次方程有整数解的充要条件.     

Assessment in higher education: drivers,barriers and directions for change in the UK

Assessment is fundamental to student learning and achievement. However, whilst research consistently emphasises the role of assessment in supporting the development of the learner, the reality of assessment processes and practices in higher education is frequently indicated to fall someway short. This article aims to contribute to a shared understanding of the discourse surrounding assessment in higher education in the UK, and presents a synopsis of the role of assessment in curriculum change. Key drivers for change, the inhibitory role of the dominant discourse of assessment and suggestions for future development towards an assessment for learning culture, are considered as a means of giving greater prioritisation to assessment than is currently afforded.     

地役权制度浅析

当今社会发展日新月异，新的物之利用形式层出不穷，伴随而来的相邻不动产纠纷层出不穷，在理论和实践中设立地役权制度是十分必要的。本文从地役权的概念入手，通过分析地役权与相邻关系的关系，提出相邻权是不能够替代地役权的，只有在我国的物权法制度中分别建构相邻关系和地役权制度，才能更好地体现和保护当事人的权益。     

规范项目管理加强实验室建设

阐述了实验室建设采用项目管理的必要性,在分析实验室建设项目特殊性基础上,对如何做好实验室建设项目管理、提高投资效益提出了若干措施。     

矩阵求逆问题的条件数

利用线性方程组和向量、矩阵的范数,推导出矩阵求逆问题的条件数。而此条件数是矩阵求逆对该矩阵变动的敏感性的一个度量。用以度量计算结果逆矩阵的相对误差的比值可以用已知矩阵的相对误差来估计。     

关于正定矩阵的二个充要条件

本文给出二个判定正定矩阵的新方法。