Impact fatigue behavior of ZrN/Zr-N/Zr coatings on H13 steel by CFUBMSIP

ZrN/Zr-N/Zr coatings were deposited on H13 steel by close field unbalanced magnetron sputtering ion plating （CFUBMSIP） technique. The effect of two main parameters such as OEM and bias voltage for the CFUBMSIP process on the microstructure, mechanical properties and impact fatigue behavior of the coatings was investigated. The results indicate that with OEM increasing from 55% to 65% the surface particles size of the coatings increases while it remains almost similar when the bias voltage changes from 60 to 75 V. An aggregation of the particles occurs on the coatings surface, with further increasing the OEM and bias voltage to 75% and 90 V, respectively. The coatings show a columnar grain structure and are mainly composed of two phases of ZrN and Zr. The coating hardness decreases with OEM value increasing and both the coating hardness and modulus go up with bias voltage. The coating deposited under OEM of 65% and bias voltage of 75 V shows the best impact fatigue property.     

用于电脑调色的基础乳胶漆配方设计

分析了乳液体系、增稠体系对调色基础漆展色性的影响,并且探讨了调色基础乳胶漆中PVC与钛白含量的设计。     

渣油催化裂化液态烃的深度利用

介绍了渣油催化裂化副产液态烃的综合利用方法，着重阐述了碳四通过催化脱硫并运用萃取精馏、催化精馏和超精密精馏的方法生产1-丁烯和甲基叔丁基醚的试验和实施。     

无机热致变色材料的研究及应用进展

无机热致变色材料是一类新型的无机功能材料,介绍了无机温致变色材料的变色机理,制备方法,同时对无机温致变色材料发展趋势和应用做了具体的讨论和分析。     

掺半导体玻璃波导光栅耦合器及其功率限制作用

本文报导了在掺半导体玻璃波导上用离子刻蚀的方法制备出了表面刻蚀光栅耦合器。观察到了光栅耦合器的耦合效率随着输入激光功率增加而下降的功率限制作用。     

Prediction of reinforcement corrosion based on electrochemical equivalent under loading

Experiment was carried out to simulate different loading level elements under coupling of stray current and 5% chlorine salt solution. When calculating corrosion of reinforcement, the influence of loading should be considered based on the first law of Faraday electrolysis. The current density of the corrosion was measured by the linear polarization resistance method. The function of corrosion current density was obtained by nonlinear fitting method, and the influence coefficient of loading level to electrochemical equivalent was obtained base on the function of corrosion current density. The experimental results show that the corrosion current density increases with stress ratio of concrete structures. The reinforcement corrosion weight can be calculated through the influence coefficients of electrochemical equivalent and the result is in line with the actual situation.     

落叶松浓胶及甲醛含量对落叶松单宁胶粘剂粘度的影响

通过对不同配比的液体落叶松单宁胶粘剂粘度及干燥后的粉状落叶松单宁胶粘剂粘度进行测定，探明了液体落叶松单宁胶粘剂与粉状落叶松单宁胶粘剂粘度之间的关系，为制定合理的生产工艺参数提供了可靠的理论依据。     

Clifford分析中三正则函数的线性边值问题

讨论Clifford分析中三正则函数的两类线性边值问题,运用积分方程的方法和压缩映射原理,得到了该问题A的解的积分表达式,并给出问题A'的另一种解法.     

Minimizing total weighted completion time with an unexpected machine unavailable interval

In the past two decades, scheduling with machine availability constraints has received considerable attention. Until recently most research has focused on the setting where all machine unavailability information is known at the beginning of the scheduling horizon. In reality, this is not practical in some cases. The machine may become unavailable to process jobs due to a machine breakdown or an occurrence of an emergent job that has to be processed immediately. In both cases, the start time of the unavailable interval is unknown beforehand, and the length of the interval may not be known until the end of the interval. In this article, we consider the situation in which the scheduler has to make scheduling decisions without any knowledge of the machine unavailable intervals. Of particular interest is the problem of minimizing total weighted completion time. When there are two or more unavailable intervals on a single machine, Fu et al. (2009) have shown that the problem is exponentially inapproximable even when jobs’ weights are equal to their processing times and one has full knowledge of unavailability. So in this paper we consider the scheduling problem on a single machine with a single unavailable period. And, we assume that every job has a weight proportional to its processing time. Based on whether the unavailable interval is due to a breakdown or an emergent job, we have the breakdown model and the emergent job model. First we show that no $\tfrac{\sqrt{5}+1}{2}$ -competitive online algorithm exists for the breakdown model, and no $\tfrac{11-\sqrt{2}}{7}$ -competitive online algorithm exists for the emergent job model. Next, we show that the simple LPT rule can give a 2- and a $\tfrac{9}{5}$ -competitive ratio for the breakdown model and the emergent job model, respectively. Further, we show that the ratios are tight by examples. For the offline case, we show that the First Fit LPT (FF-LPT) rule can give a tight approximation ratio of 2 and 4/3 for the breakdown model and the emergent job model, respectively. Finally, our experimental results show that, in practice, both LPT and FF-LPT perform very well and the performance improves when the number of jobs $n$ increases. In both models, when $n \ge 50$ , the worst case error ratio is much better than the theoretical bounds.     

Effect of cooling parameters on the microstructure and properties of Mobearing and Cr-bearing steels

To develop low-cost low carbon bainitic steel,Mo-bearing and Cr-bearing steels were melted in a vacuum induction furnace and were researched by thermal simulation and hot rolling at the laboratory.As the cooling rate increases from 0.2 to 50℃/s,the transformation temperatures of two steels lie between 650 and 400℃,and the final microstructures of them change from quasi-polygonal ferrite and granular bainite to lath bainite.Compared with cooling in air or by interrupted cooling,Mo-bearing and Cr-bearing steel plates cooled by sprayed water boast higher strength and superior toughness,for large-size islands are responsible for the poor mechanical properties.Compared to Mo,Cr is effective to isolate the bainitic reaction in low carbon steel,and the bainitic microstructure can also be obtained in Cr-bearing steel cooled at a wide range of cooling rate.