基于角色的飞机远程协同诊断并发控制技术研究

为了克服传统远程故障协同诊断存在的缺陷,在以往飞机远程故障诊断模型研究基础上,引入了协同合作机制。通过对协作过程中协作主体与任务之间相互关系的分析以及各协作主体在协作环境中空间位置关系研究,提出了基于角色的飞机远程协同诊断并发控制模型。该模型能够动态地组建协作群体（虚拟工作组）,在虚拟工作组内进行范围更大的交互和协作;通过对各角色和任务间动态考察,采用加锁机制来协调各角色之间的关系,从而有效地避免了各角色之间的冲突,实现了各角色之间的高效协同和数据的实时传输,并且使得诊断结果更加准确完整。     

对我国六种抗震设计规范中液化判别规定的综述和建议

讨论了工程设计对砂性土液化研究的要求及我国现有六种抗震设计规范对液化问题的规定，并对各抗震设计规范的规定作了扼要对比与评述、对制订《工程抗震场地划分等级标准》中有关液化规定的条文提出了若干建议。     

220kV六氟化硫组合开关无气隙提升杆的研制

一、前言采用真空压力浸渍固化工艺(简称VPIG)制造元气隙制品,国外于六十年代初就已经发展起来了,例如,瑞士Ciba-Geigy公司在应用VPIG工艺制造环氧玻璃     

不同边界条件下非饱和土地基中的Rayleigh波传播

地球表面绝大部分土层并非处于完全饱和状态,故采用传统的饱和土两相介质理论进行动力学分析时,计算结果往往与实际情况不符。针对这一客观问题,以非饱和土为研究对象,在三相孔隙介质波动理论的基础上开展了非饱和土体半空间中Rayleigh波的弥散特性研究。分别考虑了两种不同的边界条件:(a)不透水不透气地基边界;(b)透水透气地基边界。根据边界条件及相关的本构关系式,推导出相应Rayleigh波的弥散方程,再通过Newton-Raphson法进行数值求解。最后讨论了在不同边界条件下,非饱和土地基表面附近Rayleigh波的弥散特性受到地基土饱和度、频率以及土体固有渗透系数的影响。计算结果表明:在两种边界条件下Rayleigh波的传播均受到地基土饱和度变化的影响。并且,频率及渗透系数在不同边界条件下对Rayleigh波特性的影响明显不同。     

国家发改委对铬盐产业调整动真格

10月31日，在京召开的全国铬盐行业管理工作会议上，国家发改委工业司副巡视员陈世海表示，国家将采取严厉措施促进铬盐产业的结构调整，要求2004年7月1日以后建设、没有获得国家发改委行政许可审批的铬化合物项目立刻停产、停建；2006年底淘汰单线1万吨／年以下有钙焙烧生产线，没有回旋的余地：推进无钙焙烧和液相氧化清洁工艺示范工程和工业化的开发。     

3月份全国农药进出口统计

目前，已经启动的新一轮农药结构升级正在有序推进。此次升级的主要内容是逐步削减和淘汰甲胺磷、久效磷、对硫磷、甲基对硫磷和磷胺等5种高毒有机磷杀虫剂。     

基于精细积分算法的结构地震反应计算方法

对于结构地震反应的计算问题,数值计算方法的使用非常重要,根据钟万勰提出的精细积分算法思想,对基于精细积分算法的结构地震反应计算方法进行了严密的推导并对它作了一些改进,给出了地震运动作用下计算结构速度和加速度反应的显式递推公式,对其进行了编程实现,以一个简单的框架结构地震反应分析为例,与常用的Wilson-θ法的计算结果进行了对比,验证了该精细积分算法在结构地震反应计算中的可行性和精确性。     

Vibration pore water pressure characteristics of saturated fine sand under partially drained condition

Vibration pore water pressure characteristics of saturated fine sand under partially drained condition were investigated through stress-controlled cyclic triaxial tests employed varied fine content of samples and loading frequency. In order to simulate the partially drained condition, one-way drainage for sample was implemented when cyclic loading was applied. The results show that the vibration pore water pressure’s response leads the axial stress and axial strain responses, and is lagged behind or simultaneous with axial strain-rate’s response for all samples in this research. In addition, the satisfactory linear relationship between vibration pore water pressure amplitude and axial strain-rate amplitude is also obtained. It means that the direct cause of vibration pore water pressure generation under partially drained conditions is not the axial stress or axial strain but the axial strain-rate. The lag-phase between pore water pressure and axial strain-rate increases with the increase of the fine content or the loading frequency.     

Undrained dynamical behavior of Nanjing flake-shaped fine sand under cyclic loading

A series of dynamic behavior tests on Nanjing flake-shaped fine sand were performed by using the WFI cyclic triaxial apparatus made in England. The dynamic behaviors of Nanjing flake-shaped fine sand under different static deviator stress levels and cyclic stress ratios were studied. Through comparing the effective stress path under cyclic loading with static loading, the processes of liquefaction of saturated Nanjing flake-shaped fine sand with development of dynamic pore-water pressure, including the initial compact state, compression state and dilative state, were investigated. The variation of the shear stiffness with the number of cycles and cyclic strain was investigated by analyzing the secant shear modulus in each unload-reload loop of dynamic stress-strain relationship. And by means of the exponential function, the empirical equations of the relationship between secant shear modulus Gsec, shear modulus ratio Gsec/Gmax and cyclic strain ε were established based on series of test results. The results show that according to different combinations of static deviator stress and cyclic stress, two kinds of failure patterns with deviator stress reversal or no deviator stress reversal are observed in the samples tested in this series, including cyclic mobility and the failure of accumulation residual strain. In addition, the degradation of dynamic shear modulus is due to the development of vibration pore-water pressure and it is observed that the shear modulus reduces with the progressive number of cycles.     

南京红层软岩流变特性试验研究

通过对南京红层软岩的流变试验 ,发现红层软岩存在显著的流变性 ,符合 Burgers本构模型 ,并得到 4种典型软岩的模型参数。试验得出长期强度约是其单轴抗压强度的 6 3%～ 70 %。