PZT溶胶液静电雾化雾场模拟

通过对商用计算流体力学软件FLUENT进行功能扩展，实现了空气流场、空间电场和离散雾场多场耦合过程的数值模拟．由实验数据确定雾滴的滴径和电量，采用拉格朗日模型计算雾滴在重力、空气阻力、外部电场力及雾滴间相互库伦排斥力作用下的运动轨迹，并得到雾滴的速度与其空间分布密度，由此计算雾滴在衬底上的沉积通量．     

浅析商务英语中的某些翻译误区及其原因

随着我国加入世界贸易组织，商务英语作为对外经济交流的工具，其作用日见重要。本文就商务英语翻译中由于语法理解错误，英语一词多义，专业知识模糊等原因所造成的翻译误区进行归纳分析。     

Influence of rarefaction wave on premixed flame structure and propagation behavior

To explore the influence of rarefaction wave on the structure and propagation behavior of the premixed propane/air flame in a rectangle combustion pipe, the techniques of high speed Schlieren photograph method, pressure measurement and so on are used to study the interaction processes between rarefaction wave and flame. Two cases of rarefaction wave-flame interaction were performed in the experiment. The experimental result shows that both the rarefaction waves can cause the flame transition from laminar to turbulent combustion quickly. The cowflow rarefaction wave decreases the flame speed, while the counterflow rarefaction wave leads the flame propagation speed to increasing on the whole, accompanied with sharp vibration.     

A rapid and accurate 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide colorimetric assay for quantification of bacteriocins with nisin as an example

The objective of this study is to propose a more accurate and faster MTT [3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide] colorimetric assay (MCA) for quantitative measurement of polypeptide bacteriocins in solutions with nisin as an example. After an initial incubation of nisin and indicator bacterium Micrococcus luteus NCIB 8166 in tubes, MTT was added for another incubation period. After that, nisin was quantified by estimating the number of viable bacteria based on measuring the amount of purple formazan produced by cleavage of yellow tetrazolium salt MTT. Then MCA was compared to a standard agar diffusion assay (ADA). The results suggested a high correlation coefficient (r ²=0.975±0.004) between optical density (OD) and the inhibitory effect of nisin on a bacterial strain Micrococcus luteus NCIB 8166 at a range of 0.125~32 IU/ml. The MCA described in this study was very quick. Quantification of nisin took only 7~8 h and the detection limit was at the level of 0.125 IU/ml when compared to 12 IU/ml and 24~28 h for ADA. The MCA provides an accurate and rapid method for quantification of nisin in solutions and is expected to be used for quantification of other antimicrobial substances.     

G105线颍河大桥的维修与加固

针对阜阳市颍河大桥的主要病害,进行了病害原因分析,从提高桥梁整体刚度入手,提出了维修加固方案。详细介绍了桥面凿除、横梁加强等细节处理问题,并简要介绍了施工中采用的新材料、新工艺,对桁架拱桥的维修加固具有较好的借鉴作用。     

三种群捕食-食饵离散系统的持久性

研究了具有第Ⅱ类功能性反应的三种群捕食-食饵离散系统，得到了保证该系统持久性的充分条件．     

浅论医疗事业单位固定资产的规范化管理

剖析了医疗事业单位固定资产管理工作中存在的问题及其产生的原因,提出了医疗事业单位加强对固定资产进行规范化管理的若干建议。     

东露天铁路专线采空区治理对策研究

针对东露天铁路专线所经过的采空区特点,分析了典型采空区上覆岩层的稳定性和上覆岩层移动形式,提出该地区采空区的治理措施。     

ARP欺骗攻击的整网解决方案研究

随着各种病毒与木马程序的泛滥,ARP欺骗攻击在校园网中已经成为危害网络正常稳定运行的主要问题.本文在对ARP协议进行深入分析的基础上,提出一种全网设备联动实现整体防御ARP欺骗的可行方案.     

ADC的结构及其应用

介绍了目前流行的ADC的4种结构及其性能特点。并从其电路实现的复杂程度、采样速度和应用领域等方面进行了对比研究．