铀合金动态力学性能的研究

本文利用分离式霍布金生压杆研究了四种国产铀合金的动态力学性能,给出了这些材料随应变率和环境温度变化的本构关系。实验结果表明,国产铀合金具有与钨合金相当的动态强度,是钨穿甲弹中弹芯材料的极好替代物。     

四氮杂大环铜(Ⅱ)参与的新型振荡反应实验研究

本文报道了以 5,7,1 2 ,1 4 -四乙基 - 7,1 4 -二甲基 - 1 ,4,8,1 1 -四氮杂环十四 - 4 ,1 1 -二烯铜 ( )配合物为催化剂 ,Na Br O3 为氧化剂 ,丙酮酸为有机底物 ,稀硫酸为介质的振荡反应新体系。对该体系的振荡特性进行了描述 ,并研究了 Ag 、Hg2 ,还原性物质 ,自由基抑制剂 ,四氯化碳以及温度对振荡反应的影响。     

固载于硅胶上的两种N-乙酸取代大环与Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)的配位性能研究

将两种N-乙酸取代氮氧杂大环固载(键合)于硅胶上,制得了硅胶固载大环(SGBMC)。研究了它们与Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)的配位性能、容量、选择性以及SGBMC的再生。结果表明它们对Cu(Ⅱ)有良好的配位选择性,且配位后的金属离子易为稀盐酸洗脱,SGBMC至少可重复使用5次。     

功率超声对酶促反应的影响

本文评述了功率超声在水溶液和有机中对酶促反应的影响,对固定化酶的影响,同时探讨了功率超声影响酶促反应的可能机理,并并评价功能超声作为一种工业生物化学反应促进手段的可能性。     

SO2在吸收池内的稳定性研究

在室温条件下,以Xe灯为光源,利用SO2的紫外吸收光谱,研究了SO2的浓度随时间连续变化规律.实验中考虑了温度和充垫气体N2对SO2的浓度变化的影响.实验结果表明:SO2的浓度基本上是随时间线性变化的;同时,SO2的浓度变化率与光照时间有关.     

OSA-UCS模型在色空间检测中的应用

采用Newton-Raphson算法建立了美国光学学会均匀颜色标尺系统的反向模型,对反向模型算法的精度进行了验证.结果表明,反向模型能够满足实际生产的精度要求.反向转换模型的建立弥补了均匀颜色标尺系统的不足,同时在Matlab环境下,对CIELAB,CIELUV,CIECAM97s,IPT 和 CIECAM02等5个常见颜色空间的视觉均匀性作了比较分析.研究表明,IPT 和CIECAM02颜色空间在颜色视觉均匀性方面具有优良的性能.这对于颜色复制工业中色貌模型的正确选择有着重要的意义.     

A NEW ITERATIVE METHOD FOR FINDING COMMON SOLUTIONS OF GENERALIZED EQUILIBRIUM PROBLEM, FIXED POINT PROBLEM OF INFINITE k-STRICT PSEUDO-CONTRACTIVE MAPPINGS, AND QUASI-VARIATIONAL INCLUSION PROBLEM

In this article,we introduce a hybrid iterative scheme for finding a common element of the set of solutions for a generalized equilibrium problems,the set of common fixed point for a family of infinite...     

Aging properties and mechanism of the modified asphalt by packaging waste polyethylene and waste rubber powder

For the consideration of the environmental and economic issues, retrieved packaging waste polyethylene and waste rubber powder were selected as modifiers to modify the ordinary oil asphalt, and the rotating film oven test was adopted to study the aging process of the modified asphalt. The results showed that the performance of the modified asphalt deteriorated, as indicated by the increase in the softening point and the reduced ductility and penetration. However, compared with nonmodified asphalt, the rangeability of the performance indicators of the modified asphalt before and after aging became narrow, indicating that the aging properties of the modified asphalt were improved. In the modified asphalt system, the swelling of the polymer modifiers was caused by the absorption of the light components of the asphalt, thereby reducing the formation of asphaltenes in the aging process. The polymer modifiers absorb the light oil of the asphalt, which can reduce the content of free radicals and improve the aging properties of the asphalt. In addition, the waste rubber power containing antioxidants and anti‐ozone agents effectively improves the antiaging properties of the asphalt. Copyright © 2012 John Wiley & Sons, Ltd.     

On the Transient Behavior of the M/M/1 and M/M/1/M Queues

This paper gives a transient analysis of the classic M/M/1 and M/M/1/K queues. Our results are asymptotic as time and queue length become simultaneously large for the infinite capacity queue, and as the system’s storage capacity K becomes large for the finite capacity queue. We give asymptotic expansions for p_n(t), which is the probability that the system contains n customers at time t. We treat several cases of initial conditions and different traffic intensities. The results are based on (i) asymptotic expansion of an exact integral representation for p_n(t) and (ii) applying the ray method to a scaled form of the forward Kolmogorov equation which describes the time evolution of p_n(t).