JSTAMP/NV在外覆盖件表面质量分析中的应用

针对汽车外覆盖件在冲压成形中出现的表面质量问题,本文介绍了Jstamp/nv软件的解决方案--油石仿真模块.油石仿真模块可以在零件成形仿真计算的结果或产品三维扫描数据上,再现在板料表面使用油石打磨的过程,它可以准确地预测外覆盖件表面上凹坑等缺陷产生的位置和程度.此外,本文还以某汽车翼子板为研究对象,介绍了该模块的操作过程.     

酚醛复合材料在汽车业中的应用

本文介绍了一个世界顶级酚醛树脂供应公司(比利时Vyncolit NV)，两种增强酚醛汽车构件(发动机机体和进气歧管)，两种增强酚醛汽车构件的成型工艺(RTM熔芯成型、模压)和小结。     

Radiometric calibration of single photon detectors by a single photon source based on NV-centers in diamond

A widespread use of various relative calibration techniques is established in order to realize reliable and low uncertainty measurements of the detection efficiency, which is one key parameter characterizing single photon detectors. In the following paper we will present an approach to evaluate the relative detection efficiency of single photon avalanche photo diode (SPAD) detectors compared to a standard detector. This calibration technique is based upon the fiber-coupled relative efficiency calibration of analogue detectors, used in fiber-optic communication. For the first time, to our knowledge, an intrinsic single photon source based on the nitrogen-vacancy center in diamond was used for this purpose. Furthermore, the possible influence of different photon statistics, arising from different irradiation sources like thermal sources or lasers on the calibration results for the fiber exchange method has been theoretically studied.     

基于归一化向量的文本分类算法

基于归一化思想和矩阵投影运算提出一种文本分类算法。该算法综合考虑单个类别内的文档频率和词频,用于进行矩阵投影运算。将训练样例中表示文本特征的三维空间投影到二维空间上,得到归一化的特征向量,可有效地达到降低特征空间维数、提高分类效率和精度的目的。与kNN算法的对比实验表明,该算法在时间性能和精度上都有较大提高。     

基于JSTAMP／NV的汽车B柱热冲压仿真

介绍了热成形的技术原理,并以2008年国际板材成形数值模拟会议（Numisheet’2008）上提出的汽车B柱热成形仿真的考题为例,分析了应用JSTAMP／NV进行热成形案例热力耦合仿真分析的应用过程,并将仿真结果与实验结果进行比较,结果表明仿真结果与实验结果吻合良好,精确地预测出该制件成形过程中的板料温度及厚度分布。     

多频道播控系统切换架构设计

本文通过对电视播出不同系统分控切换架构的分析,结合温州广播电视总台硬盘自动播控系统改造要求,设计了基于NV5128-MC矩阵／多通道播出切换台的多频道播控系统切换构架方案,并对方案特性进行了论述。     

平底简形件板材液压成形的数值模拟

针对传统板材冲压成形中存在的成形极限低、模具凹模复杂及零件表面品质差等缺点,发展了板料液压成形技术。通过数值模拟方法,采用钣金成形专用分析软件JSTMPA／NV对5754铝合金平底筒形件的板料液压成形过程进行了研究,以最终成形零件的壁厚分布为评定标准,对成形过程中零件可能出现的缺陷进行预测和分析,研究工艺参数包括充液室压力、凸凹模单边间隙和凹模圆角半径对零件成形性的影响,并对工艺参数进行了优化。研究表明：采用20MPa的液室压力、1．1mm的凸凹模单边间隙和5mm的凹模圆角半径时,获得的铝合金平底筒形件的     

汽车覆盖件修边模设计要点

汽车覆盖件修边模就是特殊的冲裁模,与一般的冲孔,落料模不同。本文主要介绍了汽车覆盖件修边模设计相关要点,希望对模具设计者有所帮助。     

Nanodiamonds and Their Applications in Cells

Diamonds owe their fame to a unique set of outstanding properties. They combine a high refractive index, hardness, great stability and inertness, and low electrical but high thermal conductivity. Diamond defects have recently attracted a lot of attention. Given this unique list of properties, it is not surprising that diamond nanoparticles are utilized for numerous applications. Due to their hardness, they are routinely used as abrasives. Their small and uniform size qualifies them as attractive carriers for drug delivery. The stable fluorescence of diamond defects allows their use as stable single photon sources or biolabels. The magnetic properties of the defects make them stable spin qubits in quantum information. This property also allows their use as a sensor for temperature, magnetic fields, electric fields, or strain. This Review focuses on applications in cells. Different diamond materials and the special requirements for the respective applications are discussed. Methods to chemically modify the surface of diamonds and the different hurdles one has to overcome when working with cells, such as entering the cells and biocompatibility, are described. Finally, the recent developments and applications in labeling, sensing, drug delivery, theranostics, antibiotics, and tissue engineering are critically discussed.