汽车覆盖件冲压材料流入量调试浅析

探讨了汽车覆盖件冲压材料流入量的调试方法,从前期工艺设定、模具厂外调试、模具厂内恢复等分阶段分享材料流入量的管控与调试经验,通过对冲压成形过程中材料流入量的管控、调整及恢复,提高了冲压件的外观品质、单品精度的稳定性.     

Detection of water ingress in composite sandwich structures: a magnetic resonance approach

Water ingress inside honeycomb sandwich panels during service has been linked to in-flight failure in some aircraft. There is an ongoing effort to develop nondestructive testing methods to detect the presence of water within the panels. Magnetic resonance (MR) represents an attractive approach in that it is sensitive to moisture. Using a unilateral MR sensor, testing can be applied directly to the surface of the panel. The viability of MR is demonstrated through laboratory imaging of both water within sandwich panels, as well as the adhesive itself. The detection of water using a one-sided handheld MR sensor is presented. It is shown that simple detection, as well as spatial localization of water within sandwich panels is possible.     

西门子OP170B操作面板在重型车床上的应用

介绍了西门子(SIEMENS)的SIMATICHMI(人机界面)操作面板OP170B的主要特性和使用方法以及在CC61250×160重型车床大修及电气改造上的应用。     

翼缘扩大型节点与传统节点的受力性能对比分析

为了研究翼缘扩大型节点的力学性能,对比分析其与塞板焊接节点及传统钢结构梁柱连接节点的受力性能差异,设计了一种翼缘扩大型梁柱连接节点.采用ABAQUS分析软件对三种节点在单调荷载下的受力性能进行分析,研究翼缘扩大型节点在实际结构中应用的可行性,并对比分析三种节点的性能差异.结果表明,翼缘扩大型节点能够有效改善节点的受力状态,改善节点区域应力分布问题,使节点梁端的塑性铰出现区域向跨中转移;与塞板焊接节点以及传统节点相比,翼缘扩大型节点承载力较高,且节点域柱与梁端应力分布较为均匀.     

Friction stir welding of aircraft wings

ABSTRACT

To reduce the weight of the wings of the TU-204SM aircraft, investigations were carried out to design the upper wing panel made of the V-1469 high-strength aluminium–lithium alloy of the third generation. The technology of friction stir welding was developed and fragments of the welded panel produced. The tests of the stability under compression showed that the application of the welded panels reduces the weight of the wing by up to ~10% and increases the stability and load carrying capacity by up to ~30%.     

带波纹隔板的平板式光生物反应器流动特性

在传统平板式光生物反应器中加入波纹形隔板,以其导流作用强化液体循环和气液传质,建立了新型带波纹隔板的平板式光生物反应器. 利用计算流体动力学(CFD)模拟及实验考察了该反应器的流动与传质特性及其影响因素. 结果表明,CFD模拟结果与实验测量值吻合良好,液体在上升区和下降区之间形成了良好的循环,随通气比增加,液相速度、平均气含率和溶氧体积传质系数均近似线性增加. 单位体积能量输入与平均液相体积传质系数之间有良好的线性关系. 综合各相关参数得到优化结构为：下降区/上升区截面积为1.62,隔板顶端到液面的距离为260 mm,隔板底端到反应器底部的距离为20 mm.     

安装板注射模设计

讨论了安装板塑件注射模设计的方法和步骤,介绍了在传统的模具设计基础上,采用MoldFlow、UG等相关模具软件更加科学地进行浇口位置选择、浇道、冷却系统等设计,并通过对不同方案进行分析、对比,选择较好的方案进行优化,得到最少气穴、熔接痕等缺陷的塑件,使注射成型过程在设计时就充分克服了工艺缺陷。     

基于Pro/E插座面板注射3D模设计

本文介绍了以Pro/E软件作为开发平台设计插座面板的全过程,叙述了对模具进行结构自动化设计、仿真充型和运动仿真的过程,着重阐述了模具中斜销机构的分型与抽芯设计。实现了智能软件与实际设计的结合,提高了模具设计的效率及塑料制品的生产率。     

银盐法制备透明导电膜的研究与应用

本文研究了银盐法制备透明导电膜的方法。该方法是通过对特制的银盐感光胶片进行曝光和显影加工,在聚酯片基上形成由金属银构成的网格图案,再经化学镀处理,制得透明导电膜。该透明导电膜的透光率可达80%,根据不同用途,其表面电阻在0.1~1000Ω/□宽广范围内可调控。该方法可用于制造PDP电视的透明电磁波屏蔽(EMI)膜;也可用于制造触摸屏的导电膜、聚合物和染料敏化太阳能电池的阳极,以替代ITO膜。此外,该方法还可延伸到制作RFID电子标签超高频天线等,具有广泛的应用前景。     

Cytotoxic Potential of a-Azepano- and 3-Amino-3,4-SeCo-Triterpenoids

Semi-synthetic triterpenoids, holding an amino substituted seven-membered A-ring (azepano-ring), which could be synthesized from triterpenic oximes through a Beckmann type rearrangement followed by a reduction of lactame fragment, are considered to be novel promising agents exhibiting anti-microbial, alpha-glucosidase, and butyrylcholinesterase inhibitory activities. In this study, in an attempt to develop new antitumor candidates, a series of A-ring azepano- and 3-amino-3,4-seco-derivatives of betulin, oleanolic, ursolic, and glycyrrhetinic acids were evaluated for their cytotoxic activity against five human cancer cell lines and non-malignant mouse fibroblasts by means of a colorimetric sulforhodamine assay. Azepanoallobetulinic acid amide derivative 11 was the most cytotoxic compound of this series but showed little selectivity between the different human tumor cell lines. Flow cytometry experiments showed compound 11 to act mainly by apoptosis (44.3%) and late apoptosis (21.4%). The compounds were further screened at the National Cancer Institute towards a panel of 60 cancer cell lines. It was found that compounds 3, 4, 7, 8, 9, 11, 15, 16, 19, and 20 showed growth inhibitory (GI₅₀) against the most sensitive cell lines at submicromolar concentrations (0.20–0.94 μM), and their cytotoxic activity (LC₅₀) was also high (1–6 μM). Derivatives 3, 8, 11, 15, and 16 demonstrated a certain selectivity profile at GI₅₀ level from 5.16 to 9.56 towards K-562, CCRF-CEM, HL-60(TB), and RPMI-8226 (Leukemia), HT29 (Colon cancer), and OVCAR-4 (Ovarian cancer) cell lines. Selectivity indexes of azepanoerythrodiol 3 at TGI level ranged from 5.93 (CNS cancer cell lines SF-539, SNB-19 and SNB-75) to 14.89 for HCT-116 (colon cancer) with SI 9.56 at GI₅₀ level for the leukemia cell line K-562. The present study highlighted the importance of A-azepano-ring in the triterpenic core for the development of novel antitumor agents, and a future aim to increase the selectivity profile will thus lie in the area of modifications of azepano-triterpenic acids at their carboxyl group.