Hydrodynamic effects on erosion-enhanced corrosion of stainless steel in aqueous slurries

This paper studies the hydrodynamic effects of erosive slurry on corrosion of passive target (type 304 stainless steel). The transient current response to disruption of passive film is investigated using the single particle impingement technique. The transient current density over the damaged surface is approximately independent of the hydrodynamics of fluid when the flowing velocity is in range of 5-10 m/s. It is characterized by a sharp rise caused by disruption of passive film and a slow decay due to repassivation. Therefore, the difference in transient current response is a result of different damaged surface area produced by solid particle impingement. After the kinetic parameters of repassivation are determined, the hydrodynamic effects on average corrosion rates of the passive target are quantitatively predictable with aid of the physical model developed by Lu and Luo.     

北京亦庄线商用通信无线覆盖技术

介绍了使用移动通信运营网络在地下空间进行无线通信的技术。利用无线传播技术完成地铁组网方案,将地面商用移动信号引入北京地铁亦庄线地下空间,以满足移动运营商公共无线信号在地铁内的延伸和覆盖,为乘客、工作人员提供高质量的公用移动通信的服务。     

Study of the visible light curing of vinyl ester resins using in situ Raman spectroscopy

In-situ Raman spectroscopy was used for providing the direct measurement of the C = C molar concentration of typical visible light curing vinyl ester resin. Using cyclohexyl ring stretching mode at 748 cm^-1 as reference, the back scattering configuration relative Raman cross section for epoxy vinyl ester resin of vinyl ester resins C = C stretching mode at 1,630 cm^-1 and aromatic ring stretching mode at 1,602 cm^-1 were obtained. The molar concentration of C = C during the curing process was monitored under three different powers. It was found that with the laser power increasing, the molar concentration change rising with time steadily, and visible light curing rate gradually speeding up. The residue C = C molar concentration after long curing process was quantified. This value may be useful for future design of visible light curing resins.     

新媒体和电视台制作环境资源结合的探讨

本文对数字电视、CMMB、互联网络、楼宇电视等新兴媒体进行技术和运营前景分析,讨论其所面临的困难,探讨如何利用电视台优势资源,解决新媒体所普遍面临的制作问题,本文通过传统电视台制作环境的分析,通过对编码方式的探讨,提出利用现有电视台制作环境为新媒体提供内容的可行性分析,并给出了实际技术运行方案。     

关于地下室混凝土防裂施工技术的探讨

本文从工程实例出发,从混凝土配合比设、生产过程控制等各个方面对混凝土防裂技术进行了阐述和总结,提出了具体的意见。     

Oxidation of Lead Frame Copper Alloys with Different Compositions and Its Effect on Oxide Film Adhesion

Oxidation of four typical lead frame copper alloys was investigated. The oxidation rate and adhesion strength of oxide films to copper alloy substrates were studied by measuring the thickness and carrying out peel tests. The results show that, although copper alloys C5191 and C7025 have thinner oxide films, a lower adhesion strength and a higher proportion of CuO were obtained than in the other copper alloys EFTEC64T and C194. The adhesion strength is mainly influenced by the structure of the oxide film of the copper alloys, especially the CuO/Cu₂O ratio in the film. The highest adhesion strength is obtained for the copper oxide film with a basic structure of CuO/Cu₂O/Cu and a CuO/Cu₂O ratio of about 0.1. The segregation of additional elements in the copper alloy plays an important role in the oxide film structure.     

Femtocell在中小企业的应用

主要探讨Femtocell在3G时代的价值,分析Femtocell在中小企业的应用,以及其在满足中小企业应用所应进一步增强的各种能力建设。     

Physicochemical characterisation,digestibility and anticonstipation activity of some high‐resistant untraditional starches from zingiberaceae plants

To find new starch sources with particular characteristics, five untraditional starches from zingiberaceae plants were studied about their physicochemical properties, digestibility and anticonstipation activity and compared with starches from traditional sources (potato and corn). All the five starches presented the shape of triangular, with visible thin sheet, which were significantly different from conventional sources. The crystal type of these five starches was B‐type pattern. Swelling power at 75 °C was negatively correlated with crystallinity. There was no significant difference in amylose content between starches from rhizome and tuber of Curcuma phaeocaulis Val., while they displayed significant variability in RS content. Starches from rhizome of Curcuma kwangsiensis, Curcuma wenyujin, Curcuma phaeocaulis Val. and Curcuma longa L. possessed much higher resistant starch content (range from 87.06% to 95.40%) and could better prevent constipation than potato and corn starches, which made them potential for managing diabetes and improving defecation conditions.