Aeroservoelastic model based active control for large civil aircraft

A modeling and control approach for an advanced configured large civil aircraft with aeroservoelasticity via the LQG method and control allocation is presented.Mathematical models and implementation issues for the multi-input/multi-output(MIMO) aeroservoelastic system simulation developed for a flexible wing with multi control surfaces are described.A fuzzy logic based optimization approach is employed to solve the constrained control allocation problem via intelligently adjusting the components of output v...     

微波炉用磁控管碳化钍钨阴极断裂失效分析

本文采用扫描电镜、X射线残余应力分析仪、金相显微镜等工具分析了微波炉用磁控管碳化钍钨阴极的断裂失效机理，碳化后钍钨阴极较粗大的晶粒与内应力是其断裂的主要原因。     

烷基多胺醚GE-609浮选含铁硅酸盐碧玉的研究

以烷基多胺醚GE-609作为反浮选捕收剂,对酒钢铁矿碧玉进行了浮选试验和机理研究。研究表明:GE-609对碧玉有较好的选择分离效果,闭路试验获得了铁精矿产率82.53%、品位62.15%和回收率94.13%的良好指标。测试和溶液化学分析结果表明,在4.6相似文献   

Identification of microglial signal transduction pathways mediating a neurotoxic response to amyloidogenic fragments of beta-amyloid and prion proteins

Microglial interaction with amyloid fibrils in the brains of Alzheimer's and prion disease patients results in the inflammatory activation of these cells. We observed that primary microglial cultures and the THP-1 monocytic cell line are stimulated by fibrillar beta-amyloid and prion peptides to activate identical tyrosine kinase-dependent inflammatory signal transduction cascades. The tyrosine kinases Lyn and Syk are activated by the fibrillar peptides and initiate a signaling cascade resulting in a transient release of intracellular calcium that results in the activation of classical PKC and the recently described calcium-sensitive tyrosine kinase PYK2. Activation of the MAP kinases ERK1 and ERK2 follows as a subsequent downstream signaling event. We demonstrate that PYK2 is positioned downstream of Lyn, Syk, and PKC. PKC is a necessary intermediate required for ERK activation. Importantly, the signaling response elicited by beta-amyloid and prion fibrils leads to the production of neurotoxic products. We have demonstrated in a tissue culture model that conditioned media from beta-amyloid- and prion-stimulated microglia or from THP-1 monocytes are neurotoxic to mouse cortical neurons. This toxicity can be ameliorated by treating THP-1 cells with specific enzyme inhibitors that target various components of the signal transduction pathway linked to the inflammatory responses.     

sol-gel法制备镉掺杂铁酸镧气敏材料

研究了气敏材料的制备条件、相组成、电导和气敏性能。结果表明:固溶体La1–xCdxFeO3(0≤x≤0.15)呈典型的p型半导体。270℃操作温度下,掺杂x(Cd2+)为25%的LaFeO3材料(700℃下热处理4h)对浓度为4.5×10–5mol·dm–3的C2H5OH的灵敏度达81.5。有望开发为一类新型的酒敏传感器。     

生产系统瓶颈指数及瓶颈漂移问题研究

从静态和动态两个方面分析生产系统中的瓶颈问题.在静态方面主要通过在瓶颈识别过程中引入订单延迟成本这一重要的绩效指标.在动态方面详细分析瓶颈漂移产生的原因及形成机理,并在此基础上提出相应的预测方案.     

花瓶墩的计算分析及工程应用

基于花瓶墩的受力特点,研究柱式花瓶墩和实体花瓶墩的设计计算方法和要点,依托宁波绕城高速公路东段工程进行该结构的工程应用,验证花瓶墩计算方法的工程适用性并积累一定的实践经验。     

图形点阵LCD在手提式多元素X荧光仪中的应用

基于T6963C的图形点阵液晶显示器,功能低、与微机适配接口电路简单、显示方式灵活。介绍了该显示器在电致冷半导体探头手提式多元素X荧光仪应用中,汉字、下接菜单、能谱曲线等显示的编程技巧,及其与嵌入式PC104工控机的实用接口电路。     

结合平衡控制的动作过渡算法

为了有效地利用运动捕获数据来驱动虚拟人物,研究了动作过渡中的约束求解问题,该运动学约束求解可由解析的IK算法快速完成,但对每帧附加约束,以保证解的连续性,同时,为了使生成的动作更加真实,提出了一种在动作过渡的关键点求取平衡姿势的方法,并通过构造偏移映射,将其叠加到已生成的动作过渡序列图象上,从而较好地模拟了动态平衡过程。