山梨酸废水的生化处理

山梨酸生产废水有机浓度高、可生化性好、含盐量高。废水中CODCr为8000-16500mg/L，B/C≥0.5，含盐量≥15g/L。本工程通过淹没式厌氧生物滤池和膜分离活性污泥法处理，CODCr总去除率高达93%-99%，出水CODCr≤300mg/L，达到GB8978-1996《污水综合排放标准》行业二级排放标准，顺利通过当地环保部门的验收。     

基于样本自举的电力变压器状态评估

针对传统数据学习型方法需要大量故障历史实测数据的缺点,提出一种基于数据样本自举的电力变压器状态评估方法．通过对变压器的故障样本数据进行自举扩充,克服了工程中某类样本数据较少的问题,提高了学习型分类器的训练量,从而提高其预测分类的精度．并基于支持向量机分类方法进行变压器故障分类评估,显著提升了评估精度．     

对称密码算法S盒安全性分析

S盒是大多数对称密码算法中唯一的非线性结构,其密码学特性直接决定了密码算法的好坏。该文对美国高级加密标准 AES 算法、韩国对称加密标准SEED算法、欧洲对称加密标准 Camellia算法和中国商用密码标准SMS4算法的S盒密码学性质进行了深入的探讨,研究各种算法中S盒的代数性质和布尔函数性质,分析各种算法抵抗差分密码分析和线性密码分析等攻击的能力。通过对比S盒的优缺点,揭示了各种算法的安全性。     

Angular response of ‘pin-hole’ imaging structure measured by collimated β source

The pitch-angle distribution of energetic particles is important for space physics studies on magnetic storm and particle acceleration.A‘pin-hole’imaging structure is built with the‘pin-hole’technique and a position sensitive detector,which can be used to measure the pitch angle distribution of energetic particles.To calibrate the angular response of the‘pin-hole’imaging structure,special experiment facilities are needed,such as the particle accelerator with special design.The features of this kind of particle accelerator are:1)The energy range of the outgoing particles should be mid-energy particles(tens keV to several hundred keV);2)the particle flux should be consistent in time-scale;3)the directions of the outgoing particles should be the same and 4)the particle number within the spot should be low enough.In this paper,a method to calibrate the angular response of the‘pin-hole’imaging structure by the90Sr/90Y β source with a collimator is introduced and simulated by Geant4 software.The result of the calibration with the collimated β source is in accord with the Geant4 simulations,which verifies the validity of this method.     

Coupling of a Conventional Spectrofluorimeter with Stopped‐Flow Devices

Abstract

Experimental techniques and instruments have emerged profusely to the aid of experimental scientists. The mechanical part of research can be said to have simplified much, with the advent of various instruments for different fields of study. In this paper, we describe a simple idea of coupling two separate instrumental entities to develop a complete set‐up for doing stopped flow fluorescence experiments. The main components in the set‐up are one spectrofluorimeter and stopped‐flow devices, and the interface, being made by using optical fiber bundles. Experimental data are also shown in support of the successful interfacing of the devices to obtain useful results.     

中型山区河流水电站下游的鱼类生态需水量计算

为更好地对河流水电开发后的鱼类进行保护,探讨中型山区河流水电站下游的鱼类生态需水量计算.参照大型河流鱼类水力生境参数标准,根据中型山区河流的特点,得到中型山区河流鱼类水力生境参数的参考标准.选取有代表性的四川中型山区河流杂谷脑河进行鱼类生境原型观测,原型观测结果证实了该参考标准能够满足杂谷脑河鱼类对生境的实际需求.基于所得到的参考标准,应用生态水力学法对杂谷脑河红叶二级、理县以及甘堡3座电站减水河段的鱼类生态需水量进行计算分析,得到3座电站的生态需水量推荐值.通过分析可知,所得到的生态需水量推荐值占年均天然流量以及设计引用流量的比例都不高,在3座电站的运行实践中,具有可操作性.     

输电线路雷击暂态效应仿真分析

为了研究架空输电线路在雷击情况下的暂态特性,提出了一种ATP-EMTP的仿真模型．该模型同时考虑了输电线路参数的频变特性和冲击电晕效应,利用Marti线路模型分析输电线路的频变特性,通过自定义的电晕模块模拟冲击电晕效应．运用镜像法推导了线路几何电容的表达式,并在此基础上计算了发生电晕时线路的动态电容．仿真结果表明,冲击电晕效应对雷电过电压波的衰减和变形作用较参数频变特性严重,而同时考虑输电线路参数的频变特性和冲击电晕效应更符合实际情况．所提出的模型可精确地计算输电线路上可能出现的过电压水平,为线路的绝缘设计和防雷保护等提供可靠的依据．     

The structure and properties of Ag(Nb0.8Ta0.2)O3 ceramic doped with MnNb2O6

The influences of doping of MnNb2O6 on the structure and dielectric properties of Ag(Nb0.8Ta0.2)O3 were illustrated. Ag(Nb0.8Ta0.2)O3 samples doped with different amount of preformed MnNb2O6 (1 mol%, 2 mol%, 3 mol%, 4 mol%, 6 mol%, 8 mol%) were prepared by traditional solid-state reaction method and characterized by XRD, SEM and EDS, and the dielectric properties of samples were compared. The experiment results indicated that when the doping amount of MnNb2O6 was greater than 3 mol%, second phase appeared because of the solid solution limit. The permittivity of the Ag(Nb0.8Ta0.2)O3 samples doped with MnNb2O6 firstly increased and then decreased with the sintering temperature, while the dielectric loss decreased first, and then increased slightly. 1 100 ℃ seems to be the most proper sintering temperature for most of the samples. When the amount of MnNb2O6 is about 3 mol%, the samples have the best dielectric properties, larger permittivity and smaller dielectric loss.     

Preparation and characterization of carboxylterminated poly (butadiene-co-acrylonitrile) -epoxy resin prepolymers for fusion-bonded-epoxy powder coating

Liquid carboxyl-terminated poly(butadiene-co-acrylonitrile)(CTBN)-epoxy resin(EP) prepolymers were prepared with different contents of CTBN.The chemical reactions between EP and CTBN were characterized by Fourier ransform infrared(FTIR) spectroscopy and gel permeation chromatography(GPC).The scanning electron micrograph(SEM) and dynamic mechanical analysis(DMA) of curing films showed phase separation,and the rubber particles were finely dispersed in the epoxy matrix.Mechanical properties analysis of curing films showed that impact strength and elongation at break increased significantly upon the addition of CTBN,indicating good toughness of the modified epoxy resins.Thermogravimetric analysis(TGA) showed that the incorporation of CTBN had little effect on the thermal stability of EP.Fusion-bonded-epoxy(FBE) powder coatings modified with CTBN-EP prepolymers were prepared.The experimental results demonstrate the ability of CTBN-EP prepolymers,toughening technology to dramatically enhance the flexibility and impact resistance of FBE coatings without compromising other key properties such as corrosion protection.     

中空纤维支撑液膜萃取技术及其在药物残留检测中的应用

中空纤维支撑液膜是一种萃取新技术,具有选择性好、重现性好、节省有机溶剂等优点。介绍中空纤维支撑液膜的工作原理、结构以及萃取影响因素,就该技术在药物残留检测方面的应用进行综述。