The flow of an air curtain mounted above a doorway in which was placed a mannequinwas studied using stereo particle image velocimetry. The study revealed that the interferenceof the air curtain flow was limited to a region near the doorway. The air curtain flow stagnatesaround the top surfaces of the mannequin. A high level of turbulence also existed in thisregion. The turbulence diminished rapidly past the mannequin and increased in a thin regionnear the floor as the flow entered the floor vents
利用LaVision公司的软件平台DaVis10.0.5中加载的双脉冲双帧抖盒子算法(Shake The Box with Double Pulse-Double Frame algorithm (STB DP-DF)和新近研制的机器人型体视PIV速度矢量场测量系统,对风洞中骑自行车的假人腿部造成的阻力危机现象进行了实验研究。
A novel technique to increase the accuracy of multiplicative algebraic reconstructiontechnique (MART) reconstruction from tomographic particle image velocimetry (PIV)recordings at higher seeding density than currently possible is presented. The motion trackingenhancement (MTE) method is based on the combined utilization of images from two or moreexposures to enhance the reconstruction of individual intensity fields. The working principle isfirst introduced qualitatively, and the mathematical background is given that explains how theMART reconstruction can be improved on the basis of an improved first guess object obtainedfrom the combination of non-simultaneous views reduced to the same time instant deformingthe 3D objects by an estimate of the particle motion field. The performances of MTE arequantitatively evaluated by numerical simulation of the imaging, reconstruction and imagecorrelation processes. The cases of two or more exposures obtained from time-resolvedexperiments are considered. The iterative application of MTE appears to significantly improvethe reconstruction quality, first by decreasing the intensity of the ghost images and second, byincreasing the intensity and the reconstruction precision for the actual particles. Based oncomputer simulations, the maximum imaged seeding density that can be dealt with is tripledwith respect to the MART analysis applied to a single exposure.
赛默飞哈克Viscotest iQ 智能流变仪是一款简洁紧凑的仪器,并将灵敏度及测试能力完美结合,通过控制速率和控制应力的方法在很宽的范围内来进行各种样品的质控测试。对于乳液化妆品,平行板是非常有效的测试夹具,一来可以减少样品的用量,二来可以有效降低样品在加样过程中的破坏,并且减少温度平衡时间及样品清理时间。本报告中高质量的测试结果提供了一个很好的数据平台,以便通过不同的方法及模型来进行数据分析。
Tomographic PIV as a full volume 3D-3C flow field measurement technique can also be appliedto thin sheets used in standard PIV. Tomographic PIV and Stereo PIV are compared with experimental datafrom an impinging jet in water. The field of view is 60 mm x 40 mm, the light sheet thickness is varied from8 to 55 pixel. Images have been recorded with 4 cameras to gain results from two independent Stereo PIVsystems and from Tomographic PIV using 2-4 cameras. Different error sources for both techniques arequantified. It is shown that instantaneous flow fields from Tomographic PIV deviate less from each of thetwo stereo systems, than the two stereo systems deviate from each other. A systematic error pattern isidentified for the two stereo systems, which is not present for Tomographic PIV. Thin volume TomographicPIV allows the calculation of multiple vector planes. Two planes can be calculated even for the thinnest lightsheet (8 pixel) providing the full 3x3 strain-tensor. Thicker sheets with up to twelve vector planes allow thevisualization of the small vortex structures in this experiment.
近年来,单克隆抗体(mAb) 已成为可满足多种疾病治疗需求的主要生物制药产品。这些经特别设计的抗体具有特定基因构成,能够更好地靶向病原。在这些抗体的开发过程中,Protein A 和Protein G 分析型亲和色谱柱可用于测定各种细胞培养上清液中的抗体滴度或浓度,以选出高产量的克隆。惰性聚合物Monolith 可用作Protein A 和Protein G 色谱柱的担体。两种色谱柱都对抗体具有较高亲和性,因此它们能够仅结合细胞培养上清液中的抗体。本应用简报主要介绍Agilent Bio-Monolith Protein G 色谱柱。该色谱柱专为获得高速、高载样量而设计。文中给出的数据表明它同时具备线性与特异性。线性分析结果表明色谱柱在细胞培养上清液mAb 准确定量分析中的超高性能。此外,使用寿命分析数据能够反映色谱柱具有高重现性、较长寿命以及出色的稳定性与低反压。Bio-Monolith Protein G 色谱柱是Bio-Monolith Protein A 色谱柱的补充产品,可为单克隆抗体滴度测定提供更多选择。
集成在LabSpec 6中的ProtectionPlus模块可以为用户提供电子记录和电子签名等高级工具,以满足FDA 21CFR Part 11法规的需求。对于拉曼光谱仪来说,电子记录是指在电脑上以数字形式创建、修改或存档的数据。法规用于确保数据在使用期内一直有效,可以跟踪数据是如何获取和修改以及记录哪些用户对此类操作进行负责。电子签名则可以使用户对数据进行电子认证,使数据的有效性具有法律约束力。
We investigated the effect of burstmode with nanosecond (ns) time delay between subpulses on sodalime glass volume machining. We observed in tight focusing configuration that the use of burstmode with ns time delay between subpulses does not increase the absorption efficiency and does not bring a significant effect on the heat affected zone diameter with respect to single pulse mode. On the contrary in loose focusing configuration the use of burst mode allows increasing the aspect ratio of the heat affected zone without extra energy absorption. This effect is highly interesting for filamentation glass cutting applications.