满足左正则性条件的IC富足半群

一个有限半群是满足左正则性条件的IC富足半群当且仅当它是一个幂等元形成左正则带的纯整超富足半群,但满足左正则性条件的无限IC富足半群不都是幂等元形成左正则带的纯整超富足半群.     

半群分次范畴上的模范畴,Galois盖与Smash积

设S为有单位元的可消半群.引入半群S对C-Mod的作用及半群S分次C-模范畴的概念,证明了当C为B的Galois盖时,B-模范畴与C的不动点满子范畴是一致的.对半群S分次B-模范畴,Smash积C#S-模范畴与半群S分次B-模范畴是一致的;同时还讨论了半群S分次模的Smash积,刻画了Smash积函子#与(-)*之间的关系.     

关于左正则序半群的若干注记

研究了左正则序半群的一些性质,并给出了左正则序半群的若干刻画.作为应用,这些结论在一般半群(不含序)中都成立.     

闽江某河段河蚬组织中多环芳烃和有机氯农药的蓄积特征

用GC／MS和GC-μECD测定了闽江某河段河蚬体内多环芳烃（PAHs）和有机氯农药（OCPs）的含量，并分析了河蚬各器官组织中的蓄积特征．结果表明：河蚬体内鳃、肌肉以及内脏团中检测到的PAHs的总量分别为1322．03，397．24，951．04ng／g干重，河蚬易累积低分子量的PAHs，主要是3环PAHS，鳃、肌肉和内脏团中检测到的3环芳烃的比率分别为62．23％，47．04％和36．96％；河蚬对OCPs的蓄积种类主要是DDT类和HCH类农药，OCPs在河蚬鳃、肌肉以及内脏团中的总含量相差不大，分别为19．73，25．46，23．06ng／g干重，河蚬肌肉和内脏团中OCPs的含量与整体中OCPs的含量相关性较好（R^2=0．98和R^2=0．98），肌肉中含量与整体有机氯的含量相关系数为R^2=0．19．     

Impact of dissolved humic acid on the bioavailability of acenaphthene and chrysene assessed by membrane-based passive samplers

Dissolved organic carbon (DOC) is known to reduce the bioavailability of hydrophobic organic compounds (HOCs) in aqueous environments. This reduction occurs as a result of adsorption to DOC, apparently reducing the freely dissolved concentration of HOCs. In the present study, triolein-embedded cellulose acetate membrane (TECAM) and Japanese medaka (Oryzias latipes) were used to measure the uptake of acenaphthene and chrysene in the presence of commercial humic acid (HA) at different concentrations (0―15 mg C·L-1) under controlled laboratory conditions. Apparent uptake rate constants for PAHs in TECAM and medaka were compared and DOC-water partition coefficients (KDOCs) of two PAHs were calculated with different sampling methods by model fit. Results showed that HA present in water significantly reduced the uptake of PAHs in TECAM and medaka. The obtained values of log KDOC of acenaphthene and chrysene measured by TECAM were 4.63 and 5.83, respectively, whereas biologically determined values were 4.52 and 5.76, respectively. These log KDOC values were comparable to earlier published KDOCs toward commercial HA, thereby indicating that TECAM accumulated only the freely dissolved fraction of chemicals and uptake PAHs in a manner similar to that of fish. All these results suggested that the TECAM method can provide a good means for assessing the impact of DOC on bioavailability of PAHs in the aqueous environment.     

Banach空间弱伪压缩半群公共不动点的收敛性

在Banach空间中,给出了弱伪压缩半群定义,讨论了它的某类隐迭代序列的收敛性,改进和推广了现有文献的一些相应结果.     

非太阳自反Banach空间控制系统的可控性

研究了非太阳自反Ｂａｎａｃｈ空间下控制系统的可控性，得出了一些重要的结论。     

格序半群的一些性质

主要利用格序羊群的对偶同构这一工具，研究格序半群的一些性质，并给出格半群构成格序群的一个充分必要条件．     

群和线性半群的准完备性

本文提出了群完备和准完备的充要条件。同时,还较详尽地讨论了线性半群中的完备性问题。定出其所有的准完备类(即极大封闭集)     

OPTIMAL CONTROL OF A CLASS OF DISTRIBUTED PARAMETER DELAY SYSTEMS

1.IntroductionManyphysicalsystems,suchajsthemodynamics,electrodynamics,populationbiology,aregovernedbydifferentialequations,integrodifferentialequationsormoregenerallyfunctionaldifferentialevolutionequationsonBanachspace.Associatedoptimalcontrolprobl...