Mechanical and corrosion properties of low-carbon steel prepared by friction stir processing

Low-carbon steel plates were successfully subjected to normal friction stir processing(NFSP) in air and submerged friction stir processing(SFSP) under water, and the microstructure, mechanical properties, and corrosion behavior of the NFSP and SFSP samples were investigated. Phase transformation and dynamic recrystallization resulted in fine-grained ferrite and martensite in the processed zone. The SFSP samples had smaller ferrites(5.1 μm), finer martensite laths(557 nm), and more uniform distribution of martensite compared to the NFSP samples. Compared to the base material(BM), the microhardness of the NFSP and SFSP samples increased by 19.8% and 27.1%, respectively because of the combined strengthening effects of grain refinement, phase transformation, and dislocation. The ultimate tensile strengths(UTSs) of the NFSP and SFSP samples increased by 27.1% and 38.7%, respectively. Grain refinement and martensite transformation also improved the electrochemical corrosion properties of the low-carbon steel. Overall, the SFSP samples had better mechanical properties and electrochemical corrosion resistance than the NFSP samples.     

Uncoupled PID Control of Coupled Multi-Agent Nonlinear Uncertain systems

In this paper, PID (proportional-integral-derivative) controllers will be designed to solve the tracking problem for a class of coupled multi-agent systems, where each agent is described by a second-order high-dimensional nonlinear uncertain dynamical system, which only has access to its own tracking error information and does not need to communicate with others. This paper will show that a 3-dimensional manifold can be constructed based on the information about the Lipschitz constants of the system nonlinear dynamics, such that whenever the three parameters of each PID controller are chosen from the manifold, the whole multi-agent system can be stabilized globally and the tracking error of each agent approaches to zero asymptotically. For a class of coupled first-order multi-agent nonlinear uncertain systems, a PI controller will be designed to stabilize the whole system.     

多发多收SAR波形设计与高分辨成像技术综述

多发多收合成孔径雷达(multi input multi output synthetic aperture radar, MIMO SAR)作为一种新雷达体制,通过多天线的收发可以获得比实际收发天线数目多的等效观测通道,相比传统SAR体制的约束,MIMO SAR在实现高分辨率宽测绘带遥感、慢速运动目标检测、三维成像等方面具有很大优势。该文对近年来MIMO SAR波形设计与高分辨成像技术的国内外研究现状进行了综述,重点总结了正交波形设计、方位向无模糊成像和提高距离向分辨率3个关键技术,最后指出了MIMO-SAR波形设计与成像技术在未来发展中需重点解决和关注的若干问题。     

Bounding the inefficiency of the C-logit stochastic user equilibrium assignment

Compared with standard logit-based stochastic user equilibrium assignment model, the C-logit model describes route choice behavior in a more realistic way by considering the overlapping effect between routes. This paper investigates the inefficiency upper bounds of this model against the deterministic system optimum and the C-logit stochastic system optimum in terms of the total network travel time. It is found that the commonality factor of overlapping routes significantly affects the inefficiency bound, besides link congestion degree, total demand and the number of feasible routes. If the commonality factor is not considered, the efficiency loss resulting from selfishly stochastic travel behavior will be to large extent underestimated.     

改进的支持向量机低分辨雷达目标分类算法

针对雷达目标识别系统中存在库外目标、各特征属性分类性能不一致,低分辨雷达不同类别目标特征值分布区间混叠的问题。文中基于支持向量机分类算法,对目标样本特征值进行置信度分析,获得置信区间,利用代价函数确定拒识门限,对库外目标以及混叠区域目标进行拒识分析;并根据训练样本先验识别率使用注水原理分配特征属性权重;在此基础上利用支持向量机进行目标识别。雷达实测数据实验结果表明,引入置信拒识分析与注水分配加权后,分类器性能得到了有效改善。     

动力电池用纳米LiCoPO_4正极材料的合成与电化学性能

研究了动力电池用5V纳米正极材料磷酸钴锂(LiCoPO4)的喷雾裂解合成技术及其电化学性能.研究中使用喷雾干燥法获得前驱体,通过高温裂解等一系列手段获得LiCoPO4纳米正极材料,使用X射线衍射仪(XRD)、扫描电子显微镜(SEM)等分析手段对LiCoPO4样品进行分析表征和性能测试.结果发现,裂解温度是影响LiCoPO4合成的主要因素,650℃以上温度煅烧获得纯相LiCoPO4.纯相LiCoPO4的电化学性能不甚理想,而掺杂Fe元素部分取代Co能够提高LiCoPO4的初始容量和循环性能,使得该材料具有很好的应用前景.     

后喻时代大学教师的核心能力分析

后喻时代的根本特征是文化传递方式的改变,由晚辈向前辈学习发展为前辈反过来向晚辈学习。以互联网为代表的现代科技使学习呈现开放化、终身化、碎片化和显性化的特征,大学教师的角色也应随之发生转换,主要体现在:从先生向同学,从授业向传道,从教书向育人进行转变。要实现这一角色的转变,教师需要具备的核心能力为终身学习能力、学术探索能力、思考批判和沟通合作能力。     

Tyrosine 842 in the activation loop is required for full transformation by the oncogenic mutant FLT3-ITD

The type III receptor tyrosine kinase FLT3 is frequently mutated in acute myeloid leukemia. Oncogenic FLT3 mutants display constitutive activity leading to aberrant cell proliferation and survival. Phosphorylation on several critical tyrosine residues is known to be essential for FLT3 signaling. Among these tyrosine residues, Y842 is located in the so-called activation loop. The position of this tyrosine residue is well conserved in all receptor tyrosine kinases. It has been reported that phosphorylation of the activation loop tyrosine is critical for catalytic activity for some but not all receptor tyrosine kinases. The role of Y842 residue in FLT3 signaling has not yet been studied. In this report, we show that Y842 is not important for FLT3 activation or ubiquitination but plays a critical role in regulating signaling downstream of the receptor as well as controlling receptor stability. We found that mutation of Y842 in the FLT3-ITD oncogenic mutant background reduced cell viability and increased apoptosis. Furthermore, the introduction of the Y842 mutation in the FLT3-ITD background led to a dramatic reduction in in vitro colony forming capacity. Additionally, mice injected with cells expressing FLT3-ITD/Y842F displayed a significant delay in tumor formation, compared to FLT3-ITD expressing cells. Microarray analysis comparing gene expression regulated by FLT3-ITD versus FLT3-ITD/Y842F demonstrated that mutation of Y842 causes suppression of anti-apoptotic genes. Furthermore, we showed that cells expressing FLT3-ITD/Y842F display impaired activity of the RAS/ERK pathway due to reduced interaction between FLT3 and SHP2 leading to reduced SHP2 activation. Thus, we suggest that Y842 is critical for FLT3-mediated RAS/ERK signaling and cellular transformation.