摘要：With the increasing complexity of industrial processes, the high-dimensional industrial data exhibit a strong nonlinearity, bringing considerable challenges to the fault diagnosis of industrial processes. To efficiently extract deep meaningful features that are crucial for fault diagnosis, a sparse Gaussian feature extractor(SGFE) is designed to learn a nonlinear mapping that projects the raw data into the feature space with the fault label dimension. The feature space is described by the one-hot encoding of the fault category label as an orthogonal basis. In this way, the deep sparse Gaussian features related to fault categories can be gradually learned from the raw data by SGFE. In the feature space,the sparse Gaussian(SG) loss function is designed to constrain the distribution of features to multiple sparse multivariate Gaussian distributions. The sparse Gaussian features are linearly separable in the feature space, which is conducive to improving the accuracy of the downstream fault classification task. The feasibility and practical utility of the proposed SGFE are verified by the handwritten digits MNIST benchmark and Tennessee-Eastman(TE) benchmark process,respectively.

摘要：在北宋后期的篆书书家中,最值得一提的就是米芾了。米芾的篆书艺术创作,在结体和用笔上几乎打破了以往篆书书写的所有既定规范,别开生面,有强烈的个人艺术风格。并且,米芾的印章数量之多、内容之丰富,开启了文人篆刻之先河。

摘要：针对一类具有采样周期一定的线性时不变采样控制系统,先给出系统范数的定义,然后利用自定义的系统范数对系统同时进行范数不变变形离散化和阶跃不变变形离散化,得到系统的离散形式模型.考虑H_/H∞,H2/H∞和H∞/H∞故障检测问题,给出离散系统的最优滤波器的形式;基于该离散系统的最优滤波器的设计思想和设计方法,给出系统的故障估计观测器设计方法和设计形式,构造Lyapunov函数得到误差方程渐近稳定的必要条件,通过Matlab LMI工具箱得到故障估计自适应权重矩阵Γ和参数θ.最后通过数值算例证明了该方法的有效性.

摘要：参考规范要求及德国FRMⅡ反应堆的设计经验,并根据各房间的污染程度和人员停留情况,经辐射防护计算,综合确定了反应堆厂房各工艺间通风换气次数。厂房通风系统采用了直流式,系统按层划分,每层设一套通风及空气净化系统。在穿过操作大厅密封边界的通风管道上冗余设置密闭式快速隔离阀,保证在厂房密封性试验压力(12.5kPa)作用下其内外泄漏率均为0,以确保在反应堆事故工况下,放射性物质不致通过通风系统贯穿件泄漏到外部空间。系统设计采用了钢制直连式(或联轴器)风机以及不锈钢整体式空气净化装置。

摘要：在面向装配的设计中,很少考虑装配工艺参数,在一定程度上削弱了面向装配的设计思想对装配过程的指导作用。对此,提出了一种面向自动化装配设计的圆柱轴孔装配工艺参数优化算法。该算法以装配成本为边界条件,建立了解析几何求解模型,能帮助设计者选择合理的工艺参数,如配合零件的尺寸公差、自动化装配设备的定位精度和转角精度等。最后,编制了相应的程序优化装配工艺参数。

摘要：Crimping is widely adopted in the production of large-diameter submerged-arc welding pipes. Traditionally, designers obtain the technical parameters for crimping from experience or by trial and error through experiments and the finite element(FE) method. However, it is difficult to achieve ideal crimping quality by these approaches. To resolve this issue, crimping parameter design was investigated by multi-objective optimization. Crimping was simulated using the FE code ABAQUS and the FE model was validated experimentally. A welding pipe made of X80 high-strength pipeline steel was considered as a target object and the optimization problem for its crimping was formulated as a mathematical model and crimping was optimized. A response surface method based on the radial basis function was used to construct a surrogate model; the genetic algorithm NSGA-II was adopted to search for Pareto solutions; grey relational analysis was used to determine the most satisfactory solution from the Pareto solutions. The obtained optimal design of parameters shows good agreement with the initial design and remarkably improves the crimping quality. Thus, the results provide an effective approach for improving crimping quality and reducing design times.

摘要：地动仪复原模型的造型设计是科学复原的一个重要部分,既是实现仪器功能的需要,也是展现汉代文化和艺术的一种方式,涉及到结构造型和艺术造型两方面的研究。文章回顾了史料和考古研究的新进展,介绍了筒状、钟状和卵状三类现有的造型。基于中国地震局和国家文物局专家组所完成的新复原模型,分析了结构基形、悬挂点位置、调整结构和仪器稳定性等结构问题,对新模型的造型设计和研究思路做了具体介绍。

摘要：目的针对以往腋拐存在的问题,设计一款结构简单、外形美观、科学合理的实用性腋拐。方法从人体生物力学、人机工程学、工业设计等方面出发,利用模块设计、柔性设计的方法对腋拐进行创新设计。结果经力学分析、有限元分析、样机质量检验、初步临床试用,验证了设计的可行性和临床适用性。结论本次新型腋拐的研究和设计具有极大的临床意义,其可有效减小使用者手腕和腋窝的受力,进而降低二次伤害的发生机率。同时,也可以为类似的拐杖设计提供参考。

摘要：作为传统音乐与现代音乐相结合的一种新音乐形式,中国"新民乐"受到社会各界人士的广泛关注。它的出现,在一定程度上顺应了社会发展的某种客观规律,其是非曲直应放在社会文化背景下去讨论和探究。中国"新民乐"在自身发展的同时,应注意对本民族文化信息的传递,符合民族文化发展的长远利益。"新民乐"的发展尚有待于进一步完善,以及文化界和音乐理论界的关注与指导。

摘要：为了配合在PC机上运行的软PLC编辑开发系统,使PC机完成相应的控制功能,研究和设计了软PLC运行系统．论文简述了软PLC的体系结构及运行系统的功能,详细介绍了软PLC运行系统的硬件结构和开发过程,给出了硬件系统的PCB电路板图．在设计过程中对整个电路采取了电磁兼容性处理,减小了信号间及外部干扰源的干扰．实验表明,设计的下位机能很好地实现通信与控制功能．