ZL114铝合金激光--龟弧的复合焊接

设计了一种激光-电弧复合热源焊接ZL114合金的新工艺，并对焊后的试件进行了X光检测、抗拉强度和全相组织等实验。结果表明，该种新工艺对铝合全有良好的适应性和可行性，是焊接领域的一个趋势。     

液压伺服疲劳试验机的H∞混合灵敏度控制研究

针对液压伺服疲劳试验机系统的不确定性，为获得良好的控制效果，采用了H∞鲁棒控制算法。首先，通过理论分析建立系统数学模型，讨论了该模型的不确定性及参数摄动性；然后，详细阐述了加权函数选取的一般规律；最后，应用混合灵敏度方法设计了H∞鲁棒控制器。仿真结果表明，即使被测试件刚度及系统参数在较大范围内摄动，该控制器依然具有很好的鲁棒稳定性以及良好的动态品质，较常规PID控制器更为优良。     

Wear-resistance and anti-scuffing of multi-arc ion plating molybdenum films

The multi-arc ion plating technology was employed to prepare the molybdenum films with thickness of 3 μm on the AISI 1045 steel. The wear and scuffing tests were carried out on the ball-on-disc tester. AFM and SEM equipped with EDS were adopted to observe and analyze the morphologies and element compositions of surface,cross-section and worn scar of the Mo film. The phase structure was studied by XRD and the bonding strength between Mo film and substrate was measured by scratching tester. The tribological experiments show that the Mo film possesses a good wear-resistance and an excellent anti-scuffing property. The failure mechanism of Mo film under extreme condition is flaking off.     

Performance of positive and negative electrodes in amorphous manganese oxide supercapacitor

Using potassium permanganate and acetic manganese as the reactants, amorphous manganese oxide was prepared with mechanochemical method. XRD was used for microstructure characterization, while cyclic voltammetry and constant current charge-discharge were used for electrochemical performance testing. The positive electrode （PE） and negative electrode （NE） were investigated respectively in amorphous manganese oxide supercapacitor, aiming to find their different performances in charging-discharging. The results show that the crystalline structure is destroyed in both the PE and NE material during charge-discharge process. Thereinto, the NE suffers a bit more seriously. When cycling, the PE potential scope diminishes while the NE potential scope enlarges. The increased inner resistance makes the NE curves almost bended to be a right angle, but not the PE curves. The cell＇s equivalent series resistance （ESR） is more dependent on the NE, and the capacitance is mainly determined by the rapid descent of the NE potential range. The capacitances of the NE are highly rate-dependent, decreasing from 121.3 to 53.1 F/g, by 56.2%, over the range of 5-25 mV/s. However, the PE appears to be weakly dependent and its capacitance is only dropped by 22.1%.     

机械镀锌过程中先导金属的研究

通过多次试验观察，借助于扫描电子显微镜，结合物理化学、电化学的基础理论知识，对机械镀锌过程中先导金属进行了研究。分析了先导金属在镀层中的分布以及先导金属对机械镀锌形层过程的影响。结果表明机械镀锌过程中的确有先导金属存在，在机械镀锌过程的不同阶段，有着不同的金属起着先导金属的作用。先导金属可以促进机械镀锌镀层的结合强度。     

控冷处理对中高碳Si-Mn无碳化物贝氏体钢的组织与性能的影响

探索了控制冷却热处理工艺对中高碳Si-Mn无碳化物贝氏体钢的组织和力学性能的影响。结果表明，中高碳Si-Mn钢经控冷工艺处理后在很宽的工艺参数范围内能够获得无碳化物贝氏体组织；随着试样在油中冷却时间的延长，块状残留奥氏体量不断减少，残留奥氏体薄膜含量不断增加；材料的强度、塑性和韧性随着油冷时间的延长而不断增加。材料经油中冷却7s～8s后在空气炉中360℃保温3600s～5400s处理具有最好的强度、塑性和韧性。这主要归因于残留奥氏体薄膜良好的机械稳定性和热稳定性及在机械载荷作用下的TRIP效应。     

卷取机动态补偿力矩的计算及在系统中的实现

详细论述了卷取机动态力矩的数学模型及在控制系统中的实现问题,最后给出了采用CAD计算动态力矩和动态电流、确定相关工艺参数的方法.     

数据中心计算环境应用承载能力评价

随着新型计算服务模式在数据中心的普及,针对如何有效评价其承载能力的问题,提出一种新的应用承载能力评价体系和评价模型,具体分析了网络、计算资源对服务环境的影响度,并给出了实例分析。实例分析结果表明,新的评价体系和评价模型可以有效评估计算服务模式对各类信息服务系统部署运行的应用承载能力,进而提升信息服务保障整体效益。     

Zipf定律与网络信息计量学

作为文献计量学重要定律的Zipf定律已在许多领域得到较广泛的应用,网络信息计量学伴随着网络信息的激增而受到人们越来越大的关注。该文结合搜索结果数量的分布情况,提出了在网络信息计量学中仍然存在Zipf定律的猜想,并采用公开的词语集在几个代表性的搜索引擎中进行实验验证,证实了搜索结果数目近似服从Zipf定律的结论,其中Baidu与So搜索结果的Zipf指数为0.003。