JSTAMP/NV在汽车管材液压成形数值模拟中的应用

为有效预测管材液压成形过程中存在的制品在外侧过度减薄和内侧起皱等问题,用JSTAMP/NV对汽车副车架成形的弯曲、预成形和管材液压成形工序分别进行有限元分析,得出各工序的成形极限云图和壁厚分布.应用逆向求解器HYSTAMP仅需直接指定管坯的尺寸参数、材料和弯曲工艺参数即可自动执行弯曲仿真并可在几秒内获取弯曲仿真的结果.设定液压成形工序的液压加载曲线和方向以及轴向进给位移,应用LS-DYNA执行预成形和液压成形工序仿真.JSTAMP/NV能有效模拟管材液压成形工艺过程,并预测和消除成形过程中在变形区出现的屈曲、起皱和破裂等缺陷.     

JSTAMP/NV自动报告书功能详解及其应用

为使冲压仿真工程师高效地整理仿真结果并生成仿真报告,介绍JSTAMP/NV软件的自动报告书功能及其操作流程;以自动生成汽车翼子板的拉深工序的仿真报告为例,详细说明JSTAMP/NV自动报告书功能的使用.该功能可显著减少制作仿真报告的工作量.     

Comparison of two low-hazard organic solvents as individual and cosolvents for the fabrication of polysulfone membranes

Petroleum-derived solvents commonly used in membrane fabrication are often hazardous and toxic, so the investigation of safer alternatives is important. In this study, two low-hazard solvents, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodiasolv® PolarClean) and gamma-valerolactone (GVL), were investigated as sole solvents and as cosolvents to cast polysulfone membranes via nonsolvent induced phase inversion. Normalized viscosity was introduced as an indicator of dope solution homogeneity and was used to compare the required time of mixing to achieve full dissolution of the polymer in the different solvents/solvent mixtures. All dope solutions made with low-hazard solvents were found to be more viscous than those made with traditional solvents, which meant additional mixing time was needed, and that fabricated membranes were morphologically different. With respect to operation, membranes cast from dope solutions containing equal amounts of PolarClean and GVL displayed the most similar flux curves and solute rejection to those made using the traditional solvent tested.     

Elektronenstrahlschweißen an Atmosphäre – von der Entwicklung bis zum industriellen Einsatz

Non vacuum electron beam welding – from development to industrial application Attributable to the increasing degree of standardisation in many fields of industrial manufacturing, the saving of resources and thus the demand for light weight constructions and also the rapid development on the material sector have made joining tasks increasingly complex. This involves the joining method which must meet the metallurgical demands of the base materials to be welded and also the method’s profitability. In this connection, electron beam welding in atmosphere – NV‐EBW ‐ as a joining method is getting more and more important and is, from the side of the industry, becoming increasingly popular. NV‐EBW combines the many, well‐known advantages of electron beam welding in vacuum with the possibility to work under normal ambient pressure. With an equipment efficiency of more than 50 % and very high, achievable welding speeds of up to 60 m/min for aluminium materials, the electron beam in atmosphere is an efficient and profitable tool for welding. Under the direction of Professor U. Dilthey, the ISF has for many years and in close contact with industrial partners carried out research work in the field of the NV‐EBW technology. At that, elementary contribution to the development of rotationally‐symmetrical orifice assemblies and also to the testing and optimization of the method with regard to respective welding tasks has been carried out.     

Android手机系统中基带NV数据保存方案

设计了一种Android手机系统框架下的基带NV数据保存方案。主要包括方案的总体框架、AP侧数据接收和保存流程、CP侧NV数据发送流程、扩展的ⅡC通信机制的设计,以及方案验证与结果分析等。在由Cortex A9核心的四核AP芯片和ARM9核心的单核CP芯片组成的手机硬件系统上实现和测试了该方案。验证结果表明,该基带NV数据导出方案具有良好的可靠性和可行性,可以应用于实际的商业产品中。     

钣金冲压仿真软件JSTAMP/NV的最新进展

介绍了JSTAMP/NV最新进展,包括支持使用实体单元进行拉伸仿真分析、吉田-上森模型材料数据库、高级修边有限元网格、增强的回弹补偿功能、便于应用的再计算功能、三维后处理结果加速浏览器和热成形仿真功能。     

基于Jstamp/NV的数值模拟技术在汽车车身件成形中的应用

数值模拟技术作为一种重要的有限元技术,广泛应用与各种工业领域,在汽车制造业中显得由为重要。介绍了基于Jstamp/NV的数值模拟技术在汽车制造业中的重要地位及应用情况,并以行李箱盖内板、横梁、挡泥板和B-柱为实例,分别概述了Jstamp/NV高精度的回弹预测功能、回弹补偿功能和油石仿真功能的应用。利用Jstamp/NV,通过对几种典型汽车车身件的仿真分析,证实了数值模拟技术能够准确地预测汽车车身件在冲压成形过程中经常出现的回弹及凹坑等缺陷,并指出数值模拟技术在冲压成形中正发挥着越来越重要的作用。     

Cell-Permeable Succinate Rescues Mitochondrial Respiration in Cellular Models of Statin Toxicity

Statins are the cornerstone of lipid-lowering therapy. Although generally well tolerated, statin-associated muscle symptoms (SAMS) represent the main reason for treatment discontinuation. Mitochondrial dysfunction of complex I has been implicated in the pathophysiology of SAMS. The present study proposed to assess the concentration-dependent ex vivo effects of three statins on mitochondrial respiration in viable human platelets and to investigate whether a cell-permeable prodrug of succinate (complex II substrate) can compensate for statin-induced mitochondrial dysfunction. Mitochondrial respiration was assessed by high-resolution respirometry in human platelets, acutely exposed to statins in the presence/absence of the prodrug NV118. Statins concentration-dependently inhibited mitochondrial respiration in both intact and permeabilized cells. Further, statins caused an increase in non-ATP generating oxygen consumption (uncoupling), severely limiting the OXPHOS coupling efficiency, a measure of the ATP generating capacity. Cerivastatin (commercially withdrawn due to muscle toxicity) displayed a similar inhibitory capacity compared with the widely prescribed and tolerable atorvastatin, but did not elicit direct complex I inhibition. NV118 increased succinate-supported mitochondrial oxygen consumption in atorvastatin/cerivastatin-exposed platelets leading to normalization of coupled (ATP generating) respiration. The results acquired in isolated human platelets were validated in a limited set of experiments using atorvastatin in HepG2 cells, reinforcing the generalizability of the findings.     

金刚石氮空位色心自旋传感技术

金刚石氮空位(NV)色心具有优异的室温量子特性、长相干时间、兼容微纳加工等优势,成为芯片化高精度传感器技术领域发展的新方向。基于金刚石NV色心量子效应的磁、电、温、角速度等多种物理量传感灵敏度已逐渐突破现有传感测量技术极限,在航空航天、深空探测、生命科学等学科领域应用越来越深入。本综述主要介绍金刚石NV色心量子传感机理、不同物理量传感器研究进展及未来发展趋势。     

全轴激发提升系综金刚石NV色心磁灵敏度

金刚石中系综氮空位（NV）中心作为高灵敏度磁强计得到了广泛的研究,并且在许多领域得到了应用。为解决传统的测量方式中仅利用了单个轴向的NV色心进行激发与检测使得荧光信号对比度较低以及磁检测灵敏度受限制的问题,本文使用了一种双频微波进行全轴激发的方法,通过特定[111]晶向的偏置磁场使得光探测磁共振谱线呈现出两对共振峰,并将对应的双频微波进行叠加完成同步调控。经过一系列实验验证,得到拉比振荡信号与自旋回波信号的荧光对比度分别比传统方法提高2.83倍和3.81倍,系统的极限磁噪声灵敏度提升了约14.3倍达到了0.76nT/√Hz,最终证明全轴激发对提升系统磁灵敏度的可行性。