Modeling and monitoring of multimode process based on subspace separation

In the paper, a new process monitoring approach is proposed for handling the multimode monitoring problem in the industrial batch processes. Compared to conventional method, the contributions are as follows: a new method of extracting the common subspace of different modes is proposed based on the subspace separation; after that the two different subspaces are separated, the kernel principal component models is built for the common and specific subspace respectively and the monitoring is carried out in subspace. The monitoring is carried out in the subspaces. The corresponding confidence regions are constructed according to their models respectively.     

Introducing dislocations in ceramics by mechanical rolling: A first demonstration using SrTiO3 crystal

It has long been known that dislocations can be used to tune the functional and mechanical properties of ceramics. However, introducing dislocations with controllable networks and densities into ceramics is difficult. In this study, a mechanical rolling technique was proposed to introduce dislocations into ceramics. Using a hard SiC ball with a diameter of 5 mm as a roller, plastic zones and dislocations were successfully produced in a SrTiO₃ (STO) single crystal. The plastic zone area and dislocation densities were determined by the applied force (F) and number of rolling cycles. A force of 10 N produced a scalable plastic zone with an area of 140 µm × 5000 µm without crack formation after 100 rolling cycles. The dislocation density at the center of the plastic deformation zone can reach ∼10¹⁴ m², which is an order of magnitude higher than that achieved previously by others. Increasing the applied force increased the density of the introduced dislocations, for example, ∼2 × 10¹⁴ m⁻² under F = 30 and 35 N, however, lead to crack nucleation in the sample. The dislocations introduced significantly enhanced the mechanical properties of the STO crystal. The measured Vickers’ hardness and fracture toughness increased by 55%–60% and 23%–24%, respectively, compared to the crystal before rolling. This method can serve as a robust technique for engineering dislocations in ceramics, fulfilling the requirements of dislocation-tuned mechanical and functional investigations.     

Multivariate process monitoring and analysis based on multi-scale KPLS

In the paper, a new multi-scale KPLS (MSKPLS) algorithm combining kernel partial least square (KPLS) and wavelet analysis is proposed for investigating the multi-scale nature of nonlinear process. The MSKPLS first decomposes the process measurements into separated multi-scale components using on-line wavelet transform, and then the resultant multi-scale data blocks are modeled in the framework of multi-block KPLS algorithm which can describe the global relationships across the entire scales as well as the localized features within each scale. To demonstrate the feasibility of the MSKPLS method, its process monitoring abilities were tested for a real industrial data set, and compared with the monitoring abilities of the standard KPLS method. The results clearly showed that the MSKPLS was superior to the standard KPLS, especially in that it could provide additional scale-level information about the fault characteristics as well as more sensitive fault detection ability.     

上心盘锻造成形过程的有限元模拟

通过上心盘成形过程的有限元模拟，对其速度场、等效应变、等效应力进行了分析，为上心盘锻造成形的可行性提供了理论依据，并对模具设计具有指导意义。     

纯水液压轴向柱塞泵主要部件的参数化设计

介绍了参数化设计的内容及方法。运用参数化设计手段,对纯水液压轴向柱塞泵的主要部件包括柱塞、滑靴、配流盘等进行了设计。提高了设计效率和设计质量。     

分布式地理信息系统基础研究

地理空间数据是地理信息系统的基础.结合面向对象技术、对象关系数据库技术和索引技术,文章从地理空间数据模型、地理空间数据访问服务器和空间索引等方面对地理空间数据的表示和管理进行了研究和探讨,为分布式地理信息系统的建设提供了良好的基础.     

空间信息合作与并行处理

面向海量空问信息的网络地理信息系统是当前空间信息领域的发展方向，合作和并行是多Agent系统的特点．介绍一个基于Agent的分布式地理信息系统系统Geo-Agents，该系统主要由GuServer，Facilitator，接口Agent，GIS功能Agent等组成．对Geo-Agents系统中的合作和并行模式进行了分析和探讨．合作主要体现在两个方面：接口Agent间的合作以及在接口Agent控制下的合作；并行则主要依靠GIS功能Agent来完成，可以分为三种类型：同构合作并行、异构合作并行以及互斥并行．最后，以空问数据导航和叠加分析作为实例，验证了Geo-Agents系统对空间信息的合作和并行处理。     

唐钢炼铁厂稳定铁水含硅的生产实践

通过提高入炉原燃料质量、优化高炉基本制度、提高职工的质量意识等措施的实施,2007年唐钢南区铁水含硅为0．42％～0．44％,北区铁水含硅为0．48％～0．52％,铁水质量大幅度提高。     

物理老化对高性能热塑树脂酞侧基聚芳醚酮(PEK-C)长期使用行为的影响

物理老化是大多数高分子材料在使用过程中特别是在高温环境中不可避免发生的热力学 过程,其发生的速率快慢和程度大小都直接影响这类材料的使用性能,进而影响其使用寿命．因此 对物理老化过程的预测是这类材料应用的要求．本文用示差扫描量热（ＤＳＣ）技术,通过研究高性能 热塑树脂酞侧基聚芳醚酮（ＰＥＫ－Ｃ）在高温物理老化过程中其玻璃化转变温度（ Ｔｇ）随老化时间的 变化规律,所似模拟了老化初始阶段ＰＥＫ－Ｃ的Ｔｇ与老化温度（ Ｔａ）和老化时间（ｔａ）的关系,并运 用所得的参数预测了ＰＥＫ－Ｃ在正常使用温度下物理老化发生的可能性及程度,为确定这类材料 使用寿命打下了基础．     

Fortran地理模型的拆分与服务化封装

以水文模型SWAT为例,探索了带源代码的Fortran程序向Web Service封装的方法.根据地理模型中传输参数多的特点以及模块内部存在读文件(长期、地理数据量犬)的情况,分别给出了以文件的方式传输数据和传输文件指针参数的解决方案.该封装为实现分布式的地理模型环境打下了基础.