电力放线施工采用动力伞技术及经验

动力伞放线具有较高的抗风性和稳定性，它的主要功能是由自身携带专用牵引绳进行飞行作业，然后再由地面人员使用专业施工机具对牵引绳进行进行二次牵引，从而解决了放线作业的“瓶颈”问题。     

分散控制系统的配置策略

随着分散控制系统 (DCS)的可操作性、可靠性和易维护性的提高 ,DCS的应用越来越广。但在具体到DCS配置时 ,由于不同的观念形成了两种不同的配置策略。即按DCS常规功能分类的配置策略 (简称常规策略 )和按工艺系统管理原则的配置策略 (简称一体化策略 )。该文仅就此两种配置策略进行初步的探讨。图 2     

热压冲头失效分析

利用宏观检验、硬度测试及金相检验等方法,对热压冲头失效原因进行分析.结果表明,原材料中严重的非金属夹杂物和回火温度偏低是造成热压冲头疲劳剥落的主要原因.     

流变铸造AZ91-Sn合金的组织演化、拉伸行为及磨损性能

研究了不同Sn含量流变铸造AZ91合金的组织演化、拉伸行为及磨损性能。结果表明：Sn的合金化改变了Al在镁基体中的固溶度,并且显著细化了微观组织。加入0.8%（质量分数,下同）的Sn后,合金平均晶粒尺寸从105.0 μm降至42.1 μm。高熔点的金属间化合物为析出相提供了异质形核点,这些弥散析出的第二相在流变凝固过程中有效地细化了镁基体。弥散分布的第二相抑制了枝晶组织生长,从而进一步提升了合金的力学性能。随着Sn含量的增加,合金磨损率显著降低,磨粒磨损逐渐消失。3.0%Sn合金化的流变铸造AZ91合金具有最高的抗拉伸强度以及最好的耐磨损性能。     

回火温度对M50钢组织及摩擦磨损性能影响

采用X射线衍射仪、扫描电镜、洛氏硬度计、摩擦磨损试验机等研究了不同温度(160、300和540℃)回火处理对淬火态M50钢的微观组织、硬度及摩擦磨损性能的影响.结果 表明:经1090℃淬火后M50钢显微组织由马氏体、碳化物及残留奥氏体组成,硬度为64.5 HRC,残留奥氏体含量为18％;回火处理使M50钢组织中马氏体转变为回火马氏体,随着回火温度的升高,试验钢硬度先降低再升高,其中,300℃回火时试验钢的硬度较低,540℃回火出现二次硬化现象,硬度值较大,残留奥氏体含量较低约4％.摩擦磨损试验结果表明:540℃回火处理可以有效降低试验钢的摩擦系数和磨损率,其磨损机制为轻微磨粒磨损伴随粘着磨损.     

大学计算机专业基于网络的交互式平台设计与实现

文章针对困扰教师的课堂出勤统计、学生知识点掌握程度、学生综合评价和历届学生综合能力比较等难题,通过搭建基于网络的交互式教学辅助平台,从不同角度对数据进行分析统计和可视化展示。该平台对教师及时掌握学生状况,进而进行教学方法的改进和培养学生学习兴趣起到重要的作用,将会成为教师课堂教学的有力助手。     

摄影后期处理中计算机技术的结合应用

为分析摄影后期与计算机技术的结合使用,通过分析摄影后期处理中存在的问题,论述摄影后期处理中计算机技术的结合应用,详细分析计算机技术在重新构图、修补图像等中的应用,发现采用计算机软件技术在摄像后期处理中能够非常精确的调节摄影色调,修饰图像中的缺陷,在处理中需要根据实际情况和需求来进行处理。     

Drop printing of pharmaceuticals: Effect of molecular weight on PEG coated‐naproxen/PEG 3350 solid dispersions

Solid dispersions have been used to enhance the bioavailability of poorly water‐soluble active pharmaceutical ingredients (APIs). However, the solid‐state phase, compositional uniformity, and scale‐up problems are issues that need to be addressed. To allow for highly controllable products, the drop printing (DP) technique can provide precise dosages and predictable compositional uniformity of APIs in two‐/three‐dimensional structures. DP was used to prepare naproxen (NAP)/polyethylene glycol 3350 (PEG 3350) solid dispersions with PEG coatings of different molecular weights (MWs). A comparison of moisture‐accelerated crystallization inhibition by different PEG coatings was assessed. Scanning electron microscopy, second harmonic generation microscopy, and differential scanning calorimetry analysis were performed to characterize the morphology and quantify the apparent crystallinity of NAP within the solid dispersions. Thermogravimetric analysis was employed to measure the water content within each sample. The results suggest that the moisture‐accelerated crystallization inhibition capability of the PEG coatings increased with increasing MW of the PEG coating. Besides, to demonstrate the flexibility of DP technology on manufacturing formulation, multilayer tablets with different PEG serving as barrier layers were also constructed, and their dissolution behavior was examined. By applying DP and appropriate materials, it is possible to design various carrier devices used to control the release dynamics of the API. © 2015 American Institute of Chemical Engineers AIChE J, 61: 4502–4508, 2015     

Biological Self‐Arrangement of Fiber Like Aragonite and Its Effect on Mechanical Behavior of Veined rapa whelk Shell

The microstructures of Veined rapa whelk shell were characterized, and a series of compression tests were carried out on the shell with the compressive loading direction making different angles (0°, 30°, 60° and 90°) with the shell spiral lines. Weibull analysis of the experiment results shows that the compressive strength is generally the highest for the sample with 0°‐orientation but the lowest for that with 60°‐orientation, which means that the strength shows an obvious anisotropy and the strongest orientation represents the direction parallel to the spiral lines of the shell. Such a phenomenon is closely related to the distinctive microscopic arrangements of different‐order aragonite lamellae. The interfaces of different‐level lamellae in the adjacent macro‐layers yield effects on the mechanical behavior of the shell in a coordinated fashion.     

Recent Advances in Counter Electrodes for Thiolate-mediated Dye-sensitized Solar Cells

Dye-sensitized solar cells (DSSCs) based on disulfide/thiolate (T₂/T⁻) redox couples have attracted remarkable attention due to their high efficiency and low cost. As an indispensible part of DSSCs, counter electrode (CE) design plays a crucial role in high efficiency DSSCs. This mini-review paper selectively reviews the recent advances in T-mediated DSSCs using novel CE (namely cathode) materials, mainly including noble metal platinum (Pt), carbon materials, transition metal compounds (TMCs), polymers, and hybrids, thus highlighting the merits and demerits of alternative Pt catalysts, and the prospects and challenges of Pt-free CEs for the development of high-performance and low-cost DSSCs.