NECESSARY AND SUFFICIENT CONDITION FOR GLOBAL CONTROLLABILITY OF A CLASS OF AFFINE NONLINEAR SYSTEMS

In this paper, we investigate the global controllability of a class of n-dimensional affine nonlinear systems with n- 1 controls and constant control matrix. A necessary and sufficient condition for its global controllability has been obtained by using the methods recently developed. Furthermore, we generalize the above result to a class of affine nonlinear systems with a block-triangular-like structure. Finally, we will give three examples to show the applications of our results.     

On functional decomposition of multivariate polynomials with differentiation and homogenization

This paper gives a theoretical analysis for the algorithms to compute functional decomposition for multivariate polynomials based on differentiation and homogenization which were proposed by Ye,Dai,and Lam(1999) and were developed by Faugere,Perret(2006,2008,2009).The authors show that a degree proper functional decomposition for a set of randomly decomposable quartic homogenous polynomials can be computed using the algorithm with high probability.This solves a conjecture proposed by Ye,Dai,and Lam(1999).The authors also propose a conjecture which asserts that the decomposition for a set of polynomials can be computed from that of its homogenization and show that the conjecture is valid with high probability for quartic polynomials.Finally,the authors prove that the right decomposition factors for a set of polynomials can be computed from its right decomposition factor space.     

考虑蒙皮效应的高层结构有限元分析

文章将蒙皮效应引入高层钢结构的计算分析中 ,对结构各组成部分进行有限元分析。在分析过程中将压型钢板等价为正交各向异性平板 ,并对其引入壳体概念。在推导单元刚度矩阵时 ,着重阐述了压型钢板等效剪切模量的形成。最后通过算例 ,将计算结果与参考结果相比较 ,充分验证了蒙皮效应在高层结构中可有效控制建筑物的侧移     

鲁西陆表海高分辨层序地层及海平面变动控制

依据钻孔岩芯和测进资料，对钽西陆表海盆地含煤地层进行了高分辨率层序划分，研究了高分辨率层序地层特点及其控制因素。研究表明，鲁西表海沉积序列中不同级次旋回相互叠加，具有特征的低频（Ⅱ～Ⅲ级）和高频（Ⅳ～Ⅵ级）层序叠加样式；这种相互叠加的旋回结构受控于相互叠置的海平面变化周期，即复合海平面变化。海平面变化周期表现出非对称式突发性上升到缓慢回落的节律性，形成了不对称的旋回记录。     

岳阳市南湖水体富营养化趋势研究

本文监测了湖南岳阳市南湖水体富营养化指标和纳污状况,分析了南湖水体富营养化趋势,探讨了人工水产养殖对南湖水体富营养化的影响.研究结果表明南湖已处于富营养化的边缘.     

高效液相色谱法测定血浆中小蘖硷浓度(英)

研究了心衰病人口服小蘖硷后的吸收性，血浆样品用甲醇预处理以沉淀其蛋白质，小蘖硷测定条件为：μBondapakC18柱（10μm，300×3．9mmi．d．）乙腈和0．02mol／L磷酸混合液（45：55．v／v）为流动相，紫外鉴定器设定在波长为346nm处，进样量为50μl时，最小检测极限为8ng／ml。小蘖硷平均回收率为92．5％，结果表明本试验建立的方法和血浆中黄连素浓度监测有利于指导治疗心衰。     

MULTIPLE CRITERIA DECISION MAKING： DISCORDANT PREFERENCES AND PROBLEM DESCRIPTION

There are many practical decision problems where decision makers＇ preferences may be inconsistent and contradictory. In this paper, new methods for ordering and classifying multi-attribute objects by discordant collective preferences are suggested. These methods are based on the theory of multiset metric spaces. The proposed techniques are applied to ranking companies and a competitive selection of projects, which are estimated by several experts upon multiple qualitative criteria.     

液相色谱智能化——多段梯度洗脱满意分离条件之启发式自动搜索

本文为高性能液相色谱作定量分析,提供一种新颍方法,自动求得峰形分离良好的色谱图,并由此对于仪表之智能化前景作一展望。利用多段梯度洗脱法来改进分离,会引起搜索该条件之复杂化。为此,启发微机来搜索满意的分离条件,而不去搜索最优分离条件,较为合理而且方便。用本法分析人体血液中21种主要氨基酸组分,获得成功。     

An approximate analytical solution to the ultrafiltration profile in a hemodialysis process between parallel porous plates

In a hemodialysis process, the blood that runs through straight channels exchanges substances with the dialysate through a semi-permeable membrane. The waste products, such as urea and creatinine, are therefore removed from the plasma by the membrane. In the analysis of this process, determination of the ultra-filtration profile along the porous membrane surface remains a difficult problem. In this work, an analytical solution to the derivation of such a profile was detailed, and the feasibility of this solution was discussed. The ultra-filtration profile was found to be in a cosine shape.     

A Contact and Non-Contact Hybrid Profilometer with Large Range

A novel hybrid instrument of contact and non-contact measurement with large range is developed, and both measurement systems are based on a Linnik interference microscope and on white-light interference measuring techniques. The ambiguity presented in conventional monochromatic interferometers is not present in the contact and non-contact measurement, and they have a virtually unlimited unambiguous range. For the contact measurement, the vertical measuring range is ±5 mm with a resolution of 1 nm and the horizontal measuring range is ±25 mm in x-range and y-range with a resolution of 1.25 μm; for the non-contact measurement, the vertical measuring range is ~5 mm with a resolution of 1 nm and the horizontal resolution better than 0.5 urn.