关于含有未知输入的广义时滞系统的函数观测器设计(英文)

针对含有不确定输入的广义时滞系统,研究输出函数观测器的设计方法。首先给出系统存在输出函数观测器的充分条件,其次通过线性矩阵不等式的方法求解观测器的各个参数,最后得出输出函数观测器设计的具体步骤。两个数值例子可以说明该方法的简单、有效性。     

一类非凸多目标规划问题的组合同伦内点法

对一类非凸域上的多目标规划问题通过减弱非凸可行域的边界条件,在其满足伪锥条件下,利用组合同伦内点法证明几乎对可行域的任一内点,均产生一条光滑、有界的同伦路径,并证明了该方法是整体收敛于多目标优化问题的K-K-T点,从而扩大了组合同伦内点法的应用范围,为求解非凸多目标优化问题的最小弱有效解或其他意义下的最优解提供了一种新的方法。     

蕴含（K_4-e）＋K_3可图序列的刻划

对于给定的图H,称π是蕴含H可图的,如果π有一个实现包含H作为子图.K k,C k,Pk分别表示k阶完全图,圈长为k的圈和路长为k的路.本文刻划了当n≥6时,蕴含（K 4-e）＋K3的可图序列,其中,（K 4-e）＋K3如下图所示.     

面向公交车辆优化调度的运行服务质量评测分析

将人工智能方法引入公交车辆运营调度管理,调度管理人员可根据具体运营状况,运用快速、便捷的智能调度算法,制订出符合实际情况的运营调度方案,有效提高公交车辆运营效率。利用遗传算法（genetic algorithm,GA）的智能化特征,针对北京市公交车辆运营管理问题进行了优化调度研究。仿真实验表明,利用GA的公交车辆优化调度,实现了公交车辆调度的智能化,并在基础上利用排队论推导了乘客等待时间模式,进行了优化调度结果评测分析,从而验证了利用智能调度方法能够有效地改善公交车辆运营效率的合理性和可行性。     

若干广义Petersen图的关联色数

证明了当n≡0(mod 4)时,对于k为奇数, k=2和k=4的广义Petersen图P(n,k)的关联色数。     

Scratch behavior of high speed steels for hot rolls

The scratch behaviors of two high speed steels (HSS) for hot rolls were studied by a Micro-combi Tester, and the emphasis was placed on researching the relations between the microstructure and the scratch resistance property of different HSS. The experimental results indicate that during the scratch process, the carbides are embedded into the matrix, the penetration depth of different HSS is closely related with the matrix hardness, i.e., the higher the matrix hardness, the better the scratch resistance property; and in the matrix, the fine, dispersive carbides are beneficial to form steady friction between the indenter and the scratched materials, but the coarser carbides are easier to fall into pieces.     

Precipitation characteristic of high strength steels microalloyed with titanium produced by compact strip production

Transmission electron microscopy (TEM) and physics-chemical phase analysis were employed to investigate the precipitates in high strength steels microalloyed with Ti produced by compact strip production (CSP). It was seen that precipitates in Ti microalloyed steels mainly included TiN, Ti₄C₂S₂, and TiC. The size of TiN particles varied from 50 to 500 nm, and they could precipitate during or before soaking. The Ti₄C₂S₂ with the size of 40-100 nm might precipitate before rolling, and the TiC particles with the size of 5-50 nm precipitated heterogeneously. High Ti content would lead to the presence of bigger TiC particles that precipitated in austenite, and by contrast, TiC particles that precipitated in ferrite and the transformation of austenite to ferrite was smaller. They were less than 30 nm and mainly responsible for precipitate strengthening. It should be noted that the TiC particles in higher Ti content were generally smaller than those in the steel with a lower Ti content.     

Relationship between texture and residual macro-strain in CVD diamond films based on phenomenological analysis

The relationship between texture and elastic properties of chemical vapor deposition (CVD) diamond films was analyzed based on the phenomenological theory, which reveals the influence of crystalline orientation and texture on the residual macro-strain and macro-stress. The phenomenological calculations indicated that the difference in Young's modulus could be 15% in single diamond crystals and 5% in diamond films with homogeneously distributed strong fiber texture. The experimentally measured residual strains of free-standing CVD diamond films were in good agreement with the correspondingly calculated Young's modulus in connection with the multi-fiber textures in the films, though the difference in Young's modulus induced by texture was only around 1%. It is believed that texture should be one of the important factors influencing the residual stress and strain of CVD diamond films.     

Effect of zirconium addition on the austenite grain coarsening behavior and mechanical properties of 900 Mpa low carbon bainite steel

The ultra-fine bainitic microstructure of a 900 MPa low carbon bainitic Cu-Ni-Mo-B steel was obtained by a newly developed relaxation precipitation control (RPC) phase transformation processing. In a pan-cake like prior-austenite grain, the micro- structure consisted of lath bainite, a little of abnormal granular bainite, and acicular ferrite. The effect of zirconium carbonitrides on the austenite graincoarsening behavior was studied by transmission electron microscopy (TEM). The results show that, the lath is narrower with increasing cooling rate. The ratio of all kinds of bainitic microstructure is proper with the intermediate cooling rate; and Zr-containing precipitates distribute uniformly, which restrains austenite grain growing in heat-affected welding zone.     

水杨酸对烟草GRPs基因表达的影响

通过RT-PCR得到富含甘氨酸RNA结合蛋白（GRPs）基因片段,利用northern杂交技术对水杨酸诱导不同时间不同烟草GRPs基因的表达模式进行研究.结果表明：水杨酸能诱导烟草GRPs基因上调表达,3 h达到最高,然后开始下降;但3个TMV抗性不同的供试烟草增加幅度不同,基因表达幅度与抗性有一定关系,抗性强的红花大金元表达增幅大于抗性较弱的云烟85.本研究明确了水杨酸诱导下烟草该基因的表达谱,揭示了SA诱导烟草不同抗性的品种的幅度不同,并且发现诱导后3 h为关键点,表明GRPs基因可作为烟草水杨酸代谢途径中的一个标记基因研究其途径对逆境的应答.