微漏状态下含硫循环水治理试验研究

对炼油装置泄漏物进入循环水中造成设备严重腐蚀的机理进行了分析与研究.通过实验与筛选,开发出一种处理微漏状态下含硫循环水的新工艺.该工艺采用在投加常规药剂基础上适当提高碱度,并添加一定量的缓蚀阻垢增效剂RP-49,可以较好地解决含硫泄漏物质对碳钢的腐蚀.RP-49主要是抑制硫化物进入缓蚀膜,从而保证磷酸盐和锌盐在碳钢表面形成完整的保护膜.能有效延缓碳钢设备在微漏状态下含硫循环水中的腐蚀速度.     

基于PCI9054的PCI主模式板卡的设计

PCI 总线广泛应用于现代电子测试测量领域,然而当前基于 PCI 总线的测试设备主要为应用 PCI 从模式的设备,这很大程度限制了测试设备的性能。本文首先介绍了 PCI 总线主模式的工作原理,然后通过 PLX 公司的PCI9054接口芯片与 FPGA 相结合的方式实现了测试设备的 PCI 主模式的功能。该设计可以有效提高测试设备之间数据交互的实时性,并可以应用于测试设备与专用存储设备之间的连接。最后,本文给出了基于 PCI 主模式设计的设备间数据交互实例,充分验证了该设计的可行性。     

除盐水制备技术进展

介绍了几种水除盐技术(蒸馏、离子交换、电渗析、反渗透、电去离子和电吸附)的原理、发展及应用现状,分析了水除盐技术发展的整体脉络,并预测了发展前景.     

Mechanism and Inhibition of Grain Coarsening of Al-Mg-Si Alloy in Hot Forming

A high-Ti 6061 alloy was rolled with strains up to 0.8-2.0 and at 350-550 ℃. Microstructures that developed during deformation and subsequent solution heat treatment (SHT) were observed by using optical and transmission electron microscopy. Microstructure evolution during SHT depends mainly on the initial rolling temperature, and it was found that the higher this temperature is, the coarser the grains are. After rolling at 400 ℃, well-defined cells and subgrains were formed, which induced further sites for recrystallization nucleation during subsequent SHT. The recrystallization mechanism was found to be subgrain rotation, with a final grain size smaller than 200 μm. Increasing the rolling temperature to 500 ℃ results in a low density of dislocations distributed uniformly in the deformed matrix and fewer nucleation sites during subsequent SHT. The recrystallization mechanism is grain boundary bulging, while the final grain size approaches several millimeters. Finally, a hot forming process of high-Ti 6061 alloy for inhibiting grain coarsening was proposed, and verified by experiments.     

队列行驶车辆的空气动力特性

为了研究队列行驶时,车辆前后间距对队列行驶车辆气动特性的影响以及队列中车辆数目对气动阻力系数的影响,采用数值模拟方法分别对智能交通系统中队列行驶车辆11种不同情况下车辆的气动特性分别进行了研究。结果表明:队列行驶车辆随车间距离的缩短,阻力值降低。在固定间距下,随着队列中车辆数目的增加,平均阻力系数可降低20%—30%,阻力最低的车大致处于车队的中心位置。     

粗铜冶炼电收尘烟灰的湿法处理

粗铜冶炼电收尘烟灰按原理设计经过配料、湿捏,返回炼铜炉熔炼,不仅不经济,也给炼铜生产带来危害。本文寻求水浸处理该烟灰的湿法封闭流程,既可合理回收烟灰中有价金属,做到无废水排放,又能在低投资下获得明显经济效益。     

Q420qD宽厚钢板焊后探伤不合格原因分析

以焊后探伤不合格100 mm(厚)×2300 mm(宽)Q420qD钢板为研究对象,借助金相显微镜、扫描电镜等手段,对探伤不合格部位进行分析,确定探伤不合格原因.结果 表明:钢板母材厚度1/2处存在严重的中心偏析、疏松及微裂纹缺陷,是造成Q420qD宽厚板焊后探伤不合格的原因.结合现场实际,通过对连铸拉速、二冷水量和轻...     

Overexpression of an F-box Protein Gene Reduces Abiotic Stress Tolerance and Promotes Root Growth in Rice

As one of the largest gene families, F-box domain proteins have important roles in regulating various developmental processes and stress responses. In this study, we have investigated a rice F-box domain gene, MAIF1. The MAIF1protein is mainly localized in the plasma membrane and nucleus. MAIF1 expression is induced rapidly and strongly by abscisic acid (ABA) and abiotic stresses. MAIM expression is also induced in root tips by sucrose, independent of its hydrolytic hexose products, glucose and fructose, and the plant hormones auxin and cytokinin. Overexpression of MAIF1 reduces rice ABA sensitivity and abiotic stress tolerance and promotes rice root growth. These results suggest that MAIF1 is involved in multiple signaling pathways in regulating root growth. Growth restraint in plants is an acclimatization strategy against abiotic stress. Our results also suggest that MAIF1 plays the negative role in response to abiotic stress possibly by regulating root growth.     

基于 Solidworks 的万向接轴断裂事故的技术分析

对万向接轴的断裂事故进行了分析。重点是对专用万向接轴叉头做了有限元分析,求得了它的应力分布及最大应力值。还对轧辊在咬入急停而造成的冲击性动力载荷作了具体计算,计算了在可能情况下最大的实际载荷和最大应力,从而解释了万向接轴叉头部件断裂的起因,提出了设备设计和使用方面的改进意见。