不对称性定量化的三元系热力学模型

本文提出了一个由二元系推算三元系热力学性质的新模型，此模型能自动用热力学准则来检查各二元系的对称性，并根据不对称程度来构筑权重函数，由于不需要事先选择不对称组元，消除了计算过程中的人为干扰。此模型的适用范围有所拓宽。     

筛分技术在城市河道疏浚污泥处置中的应用研究

对筛分技术应用于城市河道污泥进行探索研究,在对城市河道污泥的工程特性分析的基础上,对不同的筛分设备用于城市河道污泥进行全面分析,并将筛分技术应用于工程实践中,取得了良好的效果,为城市河道污泥预处置中遇到的难题提供了良好借鉴。     

Predictive control of an activated sludge process: An application to the Viikinmäki wastewater treatment plant

In this work, we discuss the application of multivariable predictive control for the activated sludge process in a full-scale municipal wastewater treatment plant. Emphasis is given to the selection of a control configuration that contributes to minimising the economic costs while improving the removal efficiency of the nitrogen compounds. For this task, a simple dynamic matrix control algorithm is favoured for controlling the nitrogen concentrations at the end of the biological process. The behaviour of the activated sludge process is reproduced in a commercial simulator that acts as a real-time testing platform and that is also used for identifying the multivariable input–output models for the predictive controller. For demonstrating the effectiveness of the proposed approach, different control configurations are considered and compared against the aeration control strategies currently used at the plant. Based on the simulation results, this work shows the potentiality of the dynamic matrix control which is able to decrease the energy consumption costs and, at the same time, reduce the ammonia peaks and nitrate concentration in the effluent.     

基于超熵产生的河型稳定判别式

基于非平衡态热力学理论中的超熵产生研究河型的稳定性,对河型是否有可能转化做出定量判别分析。选择河流系统的广义力和广义流,构造出河流的超熵产生以及超能耗率,根据超能耗率推导出河型稳定判别式。应用该判别式分析了黄河下游5个河段3种不同河型的稳定性,计算结果表明这5个河段的河型是稳定的,近期没有发生河型转化的可能性,与实际情况相符。利用该河型稳定判别式,不仅可判别河型的稳定性,还可以预测河流调整方向,为河流整治工程提供科学依据。     

Superconductivity in the tetragonal phase of La1.9Bi0.1CuO4+δ annealed under high oxygen pressure

We have investigated the relation between the crystal structure and superconductivity in La_1.9Bi_0.1CuO₄₊ , in which the phase separation observed in La₂CuO₄₊ is suppressed. A phase diagram in theT– plane is given for La_1.9Bi_0.1CuO₄₊ with excess oxygen. For very small values, the crystal structure is orthorhombic, and an orthorhombic-tetragonal phase transition occurs markedly at 0.03 in the measured temperature range between 13 and 293 K. Superconductivity is observed in the range of 0.04<<0.11. This is clear evidence thathigh-T _c superconductivity also appears in the tetragonal phase.     

国外污泥处置技术

污泥处置是一个引入注目的问题,本文就区盟及其成员国的污泥产量,质量,污泥处置方式的现状及可能的发展趋势进行了综述与讨论。     

Viscosity and Density at High Pressures in an Associative Ternary

The dynamic viscosity and the density of the associative ternary mixture water+diacetone alcohol+2-propanol have been measured as a function of temperature T (303.15, 323.15, and 343.15 K) and pressure P (100 MPa). The experimental results correspond to 698 values of and . With reference to the 54 values previously published on pure substances and 486 values for three corresponding binaries, the system is globally described by 1188 experimental values for various values of P, T and composition. The results for are discussed in terms of excess activation energy of viscous flow.     

Excess volumes and excess viscosities of binary mixtures of 1-bromo-2-methylpropane + an isomer of butanol at 298.15 and 313.15 K

Excess volumesV ^E, excess viscosities ^E, and excess free energies of activation of flow G^*E at 298.15 and 313.15 K are reported for binary mixtures of 1-bronw-2-methypropane and each of the alcoholic isomers of I-butanol. The results were obtained from density and viscosity measurements and show positive values forV ⁴ and negative for both ^E andG ^*E for all mixtures over the entire composition range.     

Excess volumes and excess viscosities of binary mixtures of some cyclic ethers + bromocyclohexane at 298.15 and 313.15 K

Excess Volumes,V ^E, and excess viscosities, ^E, at 293.15 and 313.15 K are reported for binary mixtures of some cyclic ethers (tetrahydrofuran, tetrahydropyran, 2-methyltetrahydrofuran and 2,5-dimethyltetrahydrofuran) + bromocyclohexane. These properties were obtained from density and viscosity measurements. ^E and ^E show negatives values for all the mixtures.     

A/O系统中活性污泥组成细菌的分离与鉴定

通过菌胶团破碎、混合细菌分离纯化、单一菌种生理生化特性研究等工作，从厌氧／好氧(Anoxic／Oxic，简称A／O)工艺活性污泥系统中分离出8种细菌并分别鉴定出其属别，其中普通细菌3种、亚硝化细菌4种和硝化细菌1种。在A／O工艺进水水质出现波动和需要调节出水质量的情况下，参照各种细菌的固有特性，调节和控制生产工艺参数，可迅速而有效地保证和提高A／O工艺处理化工生产废水的效果。