规整填料塔在蒸馏工业中的节能意义

将高效规整填料塔应用于蒸馏过程能取得良好的节能效果。本文介绍了该塔型的节能原理和一些应用实例。     

提高炼油厂经济效益的途径

通过对锦州炼油厂生产状况的详细分析，提出了通过重油和渣油深度加工，液化气综合利用，加强管理等方法来提高炼油厂的经济效益．     

金属／溶液界面氧化还原反应的量化处理初探

对金属腐蚀体系中界面反应进行综合量子化学处理还是一个探索性的工作,本文用简化势垒模型的方法,把问题适当简化后进行量化计算,给出了微观参数与界面反应速率的半定量关系式,并同电化学测量结果相比较,证明了该计算所给出的半定量判断与实验事实相等。     

基于运动信息的快速局部遮挡人脸检测

针对人脸部分被遮挡后检测率较低的问题,提出一种基于运动信息的快速局部遮挡人脸检测方法。该方法在训练阶段采用快速抽取关键样本算法减少训练时间,并初始化训练样本权值,在检测阶段首先分析视频帧间的运动信息估计人脸的大概位置,然后通过瀑布型快速人脸检测器进行进一步精确定位。实验结果表明,该方法在人脸局部遮挡情况下,相对于传统的Adaboost算法检测率有了明显提高,同时具有较快的检测速度。     

圆片级IC测试中脱机打点的一种实现方法

讨论了ICT测试中的脱机打点及其使用现状,介绍了一种基于C和C++ Builder实现的脱机打点方案,并对方案中各关键部分的实现流程进行了详细说明,最后得出了该方案可行的结论.     

Photopolymerization and initiating mechanism of Michael addition oligomers without photoinitiator

A series of acrylic oligomer which can undergo self-initiation under UV irradiation were synthesized by Michael addition of acetylacetone (acac) with multi-functional acrylates using diazabicycloundecene as catalyst. GC-MS and proton NMR were employed to study the photolysis mechanism of model molecule which was prepared from acac and ethyl acrylate. The β-diketone moiety attached to a fully substituted carbon atom was photoscissile and prone to produce alkyl free radicals by losing acetyl free radical. Polymerization of the acrylated β-diketone-containing oligomers can be thus efficiently triggered regardless of solely irradiated under UV light or blended with pure trimethylolpropane triacrylate. As determined with photo-DSC, the acrylated β-diketone-containing oligomers photopolymerized more slowly than the traditional system of trimethylolpropane triacrylate containing Darocur 1173 at the early stage, but reached a higher final conversion. The rheology measurement showed that the synthesized acrylated β-diketone-containing oligomers exhibited shear thinning property. POLYM. ENG. SCI., 47:1082–1090, 2007. © 2007 Society of Plastics Engineers     

Morphology, rheology and crystallization behavior of polylactide composites prepared through addition of five-armed star polylactide grafted multiwalled carbon nanotubes

Functionalized multiwalled carbon nanotubes (F-MWNTs) were prepared by covalent grafting of five-armed star polylactide (fa-PLA), and were characterized by thermogravimetric analysis (TGA), nuclear magnetic resonance (NMR) spectroscopy and Raman spectroscopy. A series of polylactide (PLA)/F-MWNTs composites was prepared via coagulation method. Several techniques were applied to investigate the effects of F-MWNTs on the morphology, melt rheology, and crystallization and melting behaviors of the PLA composites. The optical microscope (OM), field-emission scanning electron microscope (FE-SEM) and transmission electron microscopy (TEM) observations demonstrated that, in comparison with the case of PLA filled with pristine MWNTs, F-MWNTs case showed improved dispersion and interfacial adhesion. Oscillatory frequency sweep measurements showed that addition of about 2.0 wt% F-MWNTs led to a solidlike response where a percolated network structure formed, and the composites exhibited remarkable improvement of rheological properties in the melt state as compared with that of neat PLA. DSC measurements showed that F-MWNTs acted as a nucleating agent to enhance crystallization when below the percolation concentration, while also acted as a hindrance to retard crystallization above the percolation concentration. The double melting peaks on the DSC curves were attributed to melting of the crystals formed in the cold crystallization stage and the melting-recrystallization-remelting (mrr) event during heating, respectively.     

刮膜蒸发器在热固性酚醛树脂生产中的应用

在国内首次采用刮膜蒸发器对热固性酚醛树脂进行脱水。试验考察了分离过程真空度、进料速度、进料温度、刮膜蒸发器加热温度对分离效果的影响,探索了刮膜蒸发器应用于酚醛树脂脱水工艺条件,并成功应用于酚醛树脂工业生产。     

基于LMBP神经网络的MCM布局电磁场预测模型

通信微波多芯片组件(MCM)内不合理的芯片布局将会导致电磁干扰加剧。对具有不同布局的MCM多层布线基板的电磁场进行了仿真分析,并以仿真分析结果作为样本数据,建立了基于LMBP神经网络的MCM布局电磁场预测模型,然后用该模型对两种单面芯片布局下的MCM的坡印廷矢量数值进行了预测。结果显示,MCM电磁场的仿真与模型预测差值分别为0.332e–7W/m2和0.263e–7W/m2,证明了该预测模型的可用性。     

SAN多协议路由器流控机制的设计与实现

为了保障SAN多协议路由器高速稳定的运行并提高系统的兼容性,提出一种存储区域网络下的流控机制。SAN多协议路由器底层与上层软件间采用基于门阈的流控,进行速率匹配,使系统能够正常运行。与连接的设备间采用基于credi(t接收缓冲区数量)的流控以保证SAN路由器系统与连接设备间速率相匹配。实验结果表明引入流控机制后SAN路由器能与各种磁盘阵列及hba卡等设备正常通信,具备很好的兼容性,并能保证在最高2Gbps高速情况下稳定运行。