Corrosion behavior of copper in extremely harsh marine atmosphere in Nansha Islands,China

The corrosion behavior of pure copper exposed to the atmosphere of Nansha Islands for 21 months was studied by mass loss method, composition analysis, morphology observation and electrochemical measurements. The results showed that the average corrosion rate of copper exposed for one year was approximately 7.85 μm/a, implying that Nansha Islands was classified as a corrosion category of CX. The structure and properties of the corrosion product layer generated on the front and back sides of the exposed sample differed significantly. The inner corrosion product layer (Cu₂O) on the front side was relatively thick and dense, whereas the outer product layer (Cu₂Cl(OH)₃) was extremely thin. However, the outer product layer on the back side was thicker than the inner layer. Electrochemical measurements indicated that the protection afforded by the corrosion product layer on the front side was improved gradually, while that on the back side was deteriorated.     

Comprehensiveness and uniqueness of commercial databases and open access systems

Scientometrics - In this study, scholarly communication systems provided by commercial services and open access systems are examined on the basis of the comprehensiveness and uniqueness of their...     

Q235B带钢边裂分析

通过对带钢Q235B边裂缺陷进行检验和分析,认为造成此次带钢边裂的主要原因是铸坯边部细小裂纹、深振痕、皮下气泡、针孔以及轧钢划伤引起的,通过采取措施减少铸坯边部缺陷和划伤,可以减少边裂缺陷。     

几种不同来源食用明胶的蛋白二级结构分析及安全性能比较

用傅里叶变换红外光谱仪和圆二色谱仪对四种不同来源食用明胶的蛋白二级结构组成、重金属含量进行了分析。结果表明,四种食用明胶的二级结构均以β-sheet为主,且含有β-turn结构,其中鱼鳞明胶和猪皮明胶还含有大量的310-helix结构,鱼皮明胶和猪皮明胶含有α-helix结构,鱼鳞明胶和牛骨明胶的无序结构含量较高。四个明胶样品的重金属指标均符合国内相关标准,其中牛骨明胶的重金属含量最低,安全性最高。     

辱虐管理对建筑工人流动意愿的影响——基于情绪耗竭和传统性作用

建筑工人职业流动率较高,建筑工人频繁的职业流动不利于建筑产品供给效率的提高。本文基于资源保存理论和情感事件理论,构建了建设项目组织情境下辱虐管理影响建筑工人流动意愿的被调节的中介效应模型。研究结果发现,辱虐管理显著正向影响建筑工人的流动意愿,情绪耗竭部分中介辱虐管理和建筑工人流动意愿之间的关系,建筑工人传统性反向调节辱虐管理和建筑工人流动意愿之间的关系以及情绪耗竭的中介效应。建筑工人传统性越高,辱虐管理和建筑工人流动意愿之间的正向联系就越弱,情绪耗竭的中介效应也越弱。     

压型钢板复合楼板的施工技术

结合沈阳儿童活动中心,介绍了压型钢板强度和变形验算方法,阐述了压型钢板施工前的准备工作,施工工艺及主要施工方法,验证了采用压型钢板复合楼板的优点,取得了较好的效益。     

H2 S 对油气管材的腐蚀及防护研究综述

随着石油天然气工业的迅速发展,酸性气体引起的油气管材腐蚀问题日益突出,尤其是H2S引起的腐蚀广泛存在,严重影响着油气开采及输送管道和炼制加工设备的使用寿命。综述了H2S对油气管材腐蚀的机理、影响因素及防护方法,探讨了温度、H2S分压、p H值、流速、Cl-浓度、CO2分压及管材材质等因素对H2S腐蚀的影响,建立了H2S腐蚀速率预测模型并对其进行了相关分析,对H2S腐蚀防护方法进行了评述。最后,简述了H2S腐蚀的研究现状及发展趋势。     

液压支架电液控制系统测试装置的研制

介绍了目前液压支架电液控制系统测试装置无法进行系统整体性能检测的现状,提出国内首套液压支架电液控制系统性能测试及元部件性能测试装置,利用液压支架、采煤机、刮板输送机三机配套模型模拟煤矿井下综采工作面工况,在高低温、潮湿、电磁干扰等恶劣环境下考核电液控制系统及元部件的系统功能、技术参数、安全性、可靠性、抗干扰性等性能指标。     

基于Matlab矿井提升机盘式制动系统可靠性分析

分析了矿井提升机盘式制动系统的可靠性功能及故障模式,通过建立可靠性框图,构造了矿井提升机盘式制动系统的可靠性数学模型,并运用Matlab软件,分别分析了实际运行环境及盘闸的数目对矿井提升机盘式制动系统可靠性的影响。对于矿井提升机制动系统的安全运转有着重要的现实意义。     

Dual-core photonic crystal fiber polarization splitter based on lead silicate glass

Integral imaging is a three dimensional(3D)display technology without any additional equipment.A new system is proposed in this paper which consists of the elemental images of real images in real mode(RIRM)and the ones of virtual images in real mode(VIRM).The real images in real mode are the same as the conventional integral images.The virtual images in real mode are obtained by changing the coordinates of the corresponding points in elemental images which can be reconstructed by the lens array in virtual space.In order to reduce the spot size of the reconstructed images,the diffuser in conventional integral imaging is given up in the proposed method.Then the spot size is nearly1/20 of that in the conventional system.And an optical integral imaging system is constructed to confirm that our proposed method opens a new way for the application of the passive 3D display technology.