土木结构试验网络化方法的研究和实现

文章介绍了土木结构试验液压伺服系统,并且实现一种基于SOCKET的客户端、服务端和控制器端的网络化改造方法,通过该方法改造后的系统不但可以实现土木结构抗震性能伪静力、拟动力试验,还可以进行NetSlab平台下的大型网络协同远程拟动力试验,实现了土木结构大型试验设备共享和远程教学的目的.     

桑塔纳汽车鼓风机调速电阻的技术改进

鼓风机调速电阻是汽车空调冷热循环系统中的功能部件。由于设计缺陷,原调速电阻器未能实现在鼓风机发生故障时的应急处理。本文介绍对桑坦纳2000型轿车空调调速电阻电路与结构设计的改进,使之在风机发生堵转等故障时能够迅速切断电路,从而不会对其它零部件造成损坏。通过大量的实验,证明这种改进能够有效的对汽车空调系统进行保护,提高汽车的安全性。     

高校开放实验室信息管理系统

主要描述了应用Delphi开发的高校开放实验室信息管理系统,给出了基于C/S模式的三层系统结构的程序设计原理,详细阐述了高校开放实验室信息管理系统的设计。阐述MTS/COM 概念和特点,并通过开发实例,对基于MTS/COM 三层系统结构进行分析。     

基于MTS/COM+中间件的开发与应用

本文通过分布式出版MIS系统开发实例，对基于Client/Server两层和N层模式进行分析，并着重介绍MTS／COM＋中间件的系统架构和提供的事务管理功能，最后以Delphi5.0为开发平台，成功实现了基于MTS／COM＋中间件的分布式出版系统。     

An alternative method for fire smoke toxicity assessment using human lung cells

An alternative method for fire smoke toxicity testing using human lung cells has been investigated. A laboratory-scale vertical tube furnace was used for the generation of combustion products. Experiments were conducted under isothermal oxidative non-flaming conditions. A range of building and train interiors including polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyvinyl chloride (PVC), fiberglass reinforced polymer (FRP), and melamine-faced plywood (MFP) were studied. The exposure of combustion toxicants to human lung cells (A549) at the air/liquid interface was acquired using a Harvard Navicyte Chamber. Cytotoxic effects on human cells were assessed based on cell viability using the MTS assay (Promega). Cytotoxicity results were expressed as NOAEC (No Observable Adverse Effect Concentration), IC₁₀ (10% inhibitory concentration), IC₅₀ (50% inhibitory concentration) and total lethal concentration (TLC) values (mg/L). These cytotoxicity results were compared to published combustion toxicity data. Mass loss data and toxic product yield were also determined. The following toxicity ranking was observed from the most toxic to the least toxic: PVC>PE>PP> FRP-10>PC> FRP-16>MFP. The method described here could potentially be an alternative to current fire toxicity standard test methods.     

基于MTS试验机的磁流变阻尼器性能研究

分析了磁流变阻尼器的工作原理和理论计算模型。利MTS810试验机对MRD-60型磁流变阻尼器进行了力学性能试验,研究了在不同的控制电流、激振频率、振幅条件下,磁流变阻尼器的阻尼力与活塞杆位移、速度的特性关系,分析了外界激振力与阻尼力的响应试验,验证了力学特性的相关理论问题。采用MATLAB软件对试验数据进行了分析处理,研究了性能试验曲线中的一些特殊理论和技术问题,为磁流变阻尼器的研制和工程应用提供了重要参考依据。     

Fatigue crack propagation behavior in STS304 under mixed-mode loading

The use of fracture mechanics has traditionally concentrated on crack growth under an opening mechanism. However, many service failures occur from cracks subjected to mixed-mode loading. Hence, it is necessary to evaluate the fatigue behavior under mixed-mode loading. Under mixed-mode loading, not only the fatigue crack propagation rate is of importance, but also the crack propagation direction. In modified range 0.3≤a/W≤0.5, the stress intensity factors (SIFs) of mode I and mode II for the compact tension shear (CTS) specimen were calculated by using elastic finite element analysis. The propagation behavior of the fatigue cracks of cold rolled stainless steels (STS304) under mixed-mode conditions was evaluated by using K_I and K_II(SIFs of mode I and mode II). The maximum tangential stress (MTS) criterion and stress intensity factor were applied to predict the crack propagation direction and the propagation behavior of fatigue cracks.     

STORAGETEK2925磁带机子系统的工作原理

目前，ＳＴＯＲＡＧＥＴＥＫ２９２５磁带机广泛地用于野外地震采集系统中，由于在使用过程中故障率较高，文中通过介绍磁带机子系统的框图，分析ＭＴＳ及构成系统各板的工作原理，功能和作用及ＣＰ板在系统工作时的作用，来及时诊断和排除故障。     

Mixed mode brittle fracture in epoxy/multi-walled carbon nanotube nanocomposites

The effects of multi-walled carbon nanotubes (MWNTs) on fracture behavior of epoxy under mixed mode I/II loading have been studied. A number of test specimens based on different contents of MWNTs were prepared and the fracture tests were carried out. The increase in fracture resistance of the nanocomposite depended on the mode mixity. To find the reason, the fracture mechanisms in different modes of fracture were studied by examination of the fracture surfaces. It was found that in addition to the mechanisms, which contribute in mode I fracture, some extra mechanisms participate in mixed mode and mode II loading.     

Vaginal suppositories containing Lactobacillus acidophilus: development and characterization

Objective: The aim of this study was to develop and characterize suppositories for vaginal delivery of Lactobacillus acidophilus.

Methods: Formulations were performed in order to select suitable excipients based on suppository formation feasibility and cytotoxicity. Solid body and hollow-type suppositories were prepared by melting and molding using poly(ethylene glycol) (PEG) 400 and 4000 or Witepsol (WIT) H12 as excipients. L. acidophilus was incorporated in the molten mass before molding solid body suppositories or added as suspension into the cavity of hollow-type suppositories and sealed molten excipients. Cytotoxicity of the selected excipients was evaluated by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium and lactate dehydrogenase assays against VK2/E6E7, HEC-1-A and HeLa cells. Suppositories were characterized regarding organoleptic characteristics, mass uniformity, disintegration, breaking strength and L. acidophilus in vitro release.

Results: PEG 400, PEG 4000 and WIT H12 showed the absence of toxicity when tested using three different vaginal cell lines. Obtained vaginal suppositories presented uniform and mild texture, a content of about 1?×?10⁸ colony-forming units, completely disintegrated in simulated vaginal environment in less than 60?min and provided sustained in vitro release of L. acidophilus. Release studies further demonstrated that incorporation of freeze-dried bacteria did not result in significant loss of viable bacteria, thus supporting that vaginal suppositories may possess good properties to promote the replacement of the vaginal flora in situations of urinary tract infection.

Conclusion: Hollow-type suppositories showed to be promising delivery vehicles for vaginal delivery of probiotics.