The rank one mixed μ problem and ‘kharitonov-type’ analysis

The general mixed μ problem has been shown to be NP hard, so that the exact solution of the general problem is computationally intractable, except for small problems. In this paper we consider not the general problem, but a particular special case of this problem, the rank one mixed μ problem. We show that for this case the mixed μ problem is equivalent to its upper bound (which is convex), and it can in fact be computed easily (and exactly). This special case is shown to be equivalent to the so-called ‘affine parameter variation’ problem (for a polynomial with perturbed coefficients) which has been examined in detail in the literature, and for which several celebrated ‘Kharitonov-type’ results have been proven.     

内蒙古煤系高岭土作为FCC催化剂基质的研究

研究两种内蒙古煤系高岭土（1^＃、2^＃）的化学组成、晶体结构并与苏州高岭土进行了比较。对三种高岭土进行酸改性，利用BET、吡啶-TPD和微反测试分别研究改性前后高岭土的性能特点。并将内蒙古高岭土1^＃与苏州高岭土采用半合成方法合成了FCC催化剂，测定了其裂化活性。研究结果表明，内蒙古1^＃具有较良好的晶体结构和化学组成，经酸改性后比表面积大大增加，具有合适的孔径分布，裂化活性较好，可以取代苏州高岭土作为FCC催化剂的基质。     

非理想截面脊形介质光波导导波模式的研究

提出了一种求解任意截面形状脊形光波导的方法，先利用有效折射率的概念解出某种截面形状脊形光波导的等效折射率，再利用转移矩阵的理论求解出波导的模式色散方程。     

Integrated development of CFRP structures for a topless high performance vehicle

When modern saloon cars are re-engineered as convertibles (or roadsters) it is typical for them to lose 50% or more of the body’s torsional rigidity. Consequently the vehicles rarely handle quite as crisply, nor do they ride as well as the coupes from which they derived. This paper highlights the fundamental contributions of advanced composites in achieving the desired value of handling of the Murcièlago Roadster without penalizing the overall weight of the vehicle. To compensate for the absence of the roof structure, the vehicle was strongly redesigned by introducing new structural members and reinforcing existing critical components. A new all-carbon/epoxy composite sub-frame, which spans the entire engine bay, is comprised of elliptical tubular members, and it is the first of its kind in a production vehicle. Engineering of the sub-frame, from preliminary design to manufacturing decisions, is the focus of this paper, and is achieved through a Building Block approach that sets the program within the Integrated Product Development (IPD) strategy that the Advanced Composites Division of Automobili Lamborghini S.p.A. employs for its technology demonstrators. The strategy consists in a concurrent analytical and experimental development of the product, from the initial conceptual design and coupon testing, through the stages of element and subcomponent engineering, to final component manufacturing.     

用于快速P/G网分析的Cholesky分解法图模型

通过对Cholesky分解法求解线性方程组的分析，建立Cholesky分解法三角化对称正定阵的图模型，并基于该模型及Mesh结构P／G网络的自身特点，提出一个P／G网快速分析算法．实验证明，该算法能大大降低Mesh结构P／G网络的分析运算时间和内存占用．     

Effect of Cerium on Expression and Activity of MMP-9 from Human Carcinoma of Bladder Cell Line

Rareearthshaveledtowidespreadinterestsinlifescience ,whilethescientistsdoresearchesdeeplyinmedicalandbiochemicalfields .Rareearthsplaypotentialrolesininhibitingcancer ,andalargenum berofscientistsdedicatethemselvestoit[1] .Thema trixmetalloproteinases (MMPs)areafamilyofatleast1 7humanzinc dependentendopeptidasesthatareca pableofdegradingalmostallextracellularmatrix(ECM)components .Theyareessentialinmanyphys iologicalprocessesandseveralpathologicalconditions ,suchastumorprogression .MMPsare…     

颗粒增强金属基复合材料的干摩擦性能与磨损机理

颗粒增强金属基复合材料(PMMC5)具有优良的耐磨性，在摩擦磨损领域有着广阔的应用前景。本文评述了近年来关于PMMCs干摩擦磨损行为的研究结果，从材料因素和外部条件两个角度分析了各种因素对材料耐磨性、摩擦系数和配偶件磨损的影响，总结了不同条件下复合材料的磨损机制，并提出了设计摩擦磨损性能优良的PMMCs体系的可能途径。     

SiCf/SiC陶瓷复合材料的研究进展

SiCf/SiC陶瓷复合材料具有良好的力学性能、高温抗氧化性和化学稳定性，是航空航天和原子能等领域理想的新一代高温结构材料。本文概述了增强体SiCt的发展状况及存在的问题，对SiCt/SiC材料的制备工艺、界面相的研究状态、材料的损伤破坏机理和目前的应用研究进展做了综述，并分析了SiCf/SiC陶瓷复合材料的研究重点和发展前景。     

视觉诱发脑电波的时变最优滤波估计

本文提出了一个自修正的非平稳信号模型,并设计了时变最优滤波器于视觉诱发脑电波 的估计.估计出的信号与原始信号的各波峰潜伏期严格保持一致,而波峰幅值略有衰减.给 出的仿真与实体试验结果都证明了本方法的有效性.     

Ni的添加对TiB2-CU基复合材料微观组织的影响

利用燃烧合成工艺原位合成了TiB2-Cu基复合材料，为了改善TiB2陶瓷和Cu基体的润湿性，将金属Ni作为合金化元素加入到TiB2-Cu复合材料。通过XRD，SEM，EPMA和TEM等检测手段对金属Ni的添加对TiB2-Cu基复合材料微观组织的影响进行了研究。结果表明，含Ni复合材料的金属粘结相的面间距比不含Ni时Cu的面间距均有不同程度的减小；Ni加入后，TiB2-Cu-Ni复合材料的组织较TiB2-Cu复合材料更加致密，但陶瓷颗粒尺寸却大于TiB2-Cu复合材料的颗粒尺寸；Ni的加入降低了复合材料的导热率和冷却速度，使得部分TiB2陶瓷颗粒有足够的时间长成棒状，同时造成TiB2陶瓷颗粒间形成更多的烧结颈；Ni的加入也改善了陶瓷与金属粘结相之间的润湿性，使陶瓷相与金属粘结相的界面结合牢固，看不到TiB2-Cu复合材料中界面脱开的现象。金属Ni的添加有利于改善TiB2-Cu基复合材料的微观组织，进而利于复合材料的致密化。