Stimulated Growth of Aerobic Microbes Using Calcium Peroxide

The dissolved oxygen (DO) level in groundwateris a key parameter forin situbioremediation of con-taminated groundwater. However, due to the poorcontent of DO in groundwater, aerobic microbial deg-radation is difficult to occur in natural condition. Ear-ly work on enhancedin situbioremediation deliveredoxygen to the contaminated aquiferbyspargingairin awell, but the low solubility of oxygen increased thedifficulty and expense of maintaining aerobic condi-tions in groundwater[1]. This problem …     

修正α—亏量及满亏量问题

本文讨论超亚纯函数的修正α-亏量,得到亏量关系:并解决了一个满亏量问题:若则f(z)的级是整数。     

拉瓦锡与近代化学革命

分析了18世纪化学革命产生的背景，阐述了燃烧氧化学说的伟大意义及其在化学发展史上的地位，并探讨了拉瓦锡的科学思想和研究方法。     

氯化亚汞声光器件换能器五层结构设计

提出用环氧树脂聚合物作为缓冲层 ,设计氯化亚汞声光器件的换能器。从器件的布喇格带宽出发 ,设计了五层结构的换能器 ,计算了以Ag为电极 ,ln或pb粘接层时 ,其五层的各自厚度 ,并确保了换能器倍频程带宽     

关于有限环的若干结果

环是近世代数的重要概念之一。本文主要讨论有限环是域的若干充分必要条件,揭示了这些条件可以作为有限整环、除环、域等重要概念的刻划。这将有助于我们进一步了解和研究有限环的构造。     

复函数在代数基本定理证明中的应用

应用复变函数的知识，从复变函数的解析性出发，分别利用最大模、最小模原理和复积分的有关定理中的柯西积分定理、平均值定理对代数学基本定理给出了几种证明的方法，并进一步指出复变函数中儒歇定理和残数定理在解决根的存在性问题及在实函数中某些广义积分的应用。     

S_1~4中具有零Gauss-Kronecker曲率的极大超曲面

构造了de Sitter空间S1中的一类具有零Gauss-Kronecker曲率的极大超曲面,它们是双曲空间H4中一类极小浸入曲面ξ:V→H 4的"Polar Map"像。     

CoCl_2掺杂聚苯胺修饰电极测定水中的溶解氧

制备了可溶性聚苯胺掺杂CoCl2修饰玻碳电极,并用循环伏安法测定水中的溶解氧.研究表明:阴极峰电流ipc与水中的溶解氧浓度具有良好的线性关系.将测定结果与碘量法相比较,误差<±3%.另外该法操作简便、快速,所用电极性能稳定,为化学修饰电极用于分析水中溶解氧提供了一种新的途径.     

Effects of zinc on cadmium uptake by spring wheat （Triticum aestivum, L.）： long-time hydroponic study and short-time ^109Cd tracing study

To investigate effects of Zn on Cd uptake by spring wheat (Triticum aestivum, L.) in solution culture, long-time hydroponic experiment (1 month) (Experiment 1) and short-time Cd isotope (109Cd) tracing experiment (24 h) (Experiment 2) were conducted. In Experiment 1, spring wheat (cv. Brookton) was grown in nutrient solution at uniform cadmium concentration of 20μ mol/L and 10 zinc concentrations (0, 1, 5, 10, 20, 100, 200, 500, 1000, 2000 μ mol/L). In Experiment 2, spring wheat seedlings,pre-cultivated in complete nutrient solution, were treated with 109Cd of uniform activity and the same series of Zn concentrations as those in Experiment 1 for 24 h. Cd concentrations in shoots and roots in Experiment 1 increased marginally but not consistently with Zn increasing at Zn rates of 1～200 μmol/L, and then decreased significantly at high rates (＞200 μ mol/L). In Experiment 2, the response of 109Cd activities in shoots and roots to increasing Zn was greatly similar to the response of Cd concentrations to Zn increasing in Experiment 1. The results of the two experiments indicated that the short-time and long-time exposure of spring wheat to Zn had similar effects on Cd accumulation.     

求解最大流问题的"构造式"算法

在前向推进最大流算法的基础上作了改进，提出一种求解最大流问题的“构造式”算法。该算法应用图的深度优先搜索原理，摒弃前向推进最大流算法的并行控制而着眼于每一支流的依次增广，逐步构造中间过程“构造图”的结构并最终得到网络最大流。该方法增强了算法的直观性和可控性，易于实现。