Adaptive Observer-Based Fault Estimate for Nonlinear Systems     

宗群  刘文静刘利 《天津大学学报(英文版)》2006,12(6):425-428

In recent years, fault detection and isolation(FDI) technologies have been developing rapidly.Among them the observer-based fault detection andisolation technology for nonlinear systems are the mostattractive research areas, and lots of promising resultscan be found in survey papers[1]. Generally, thereare several kinds of strategies for observer-based FDIin nonlinearsystems such as unknown inputs observer-based FDI[2], and adaptive observer-based FDI[3]. Insome cases, fault accommodation…  相似文献   

Building the field’s knowledge of teaching and learning: Centering the socio-cultural contexts of observation systems to ensure valid score interpretation     

《Studies in Educational Evaluation》2023

The articles in a special issue of this journal, Merits and Limitations of Researching Teaching Quality More Synergistically, grapple with the assertion that the field does not share a common language or structural decomposition of teaching and that the current range of frameworks and observation systems used by researchers jeopardizes the accumulation of knowledge in the field. We analyze these arguments from a socio-cultural perspective, theorizing that teaching and the improvement of teaching occur in socially situated contexts that give meaning to all research frameworks and measurement tools. Rather than asking whether a common framework of teaching might be useful, we ask when such a framework might be useful, when can such efforts be limiting, and why? Building on contemporary validity theory, we bring the role of context back into the current conversation. We suggest that while there are important affordances of a unified framework of teaching quality, such a framework will be unable to fully address some of the issues identified in this special issue. For practical, theoretical, empirical, and socio-cultural reasons, researchers will require multiple frameworks and associated observation systems to support the study and improvement of teaching across contexts.  相似文献   

Study of CNG/diesel dual fuel engine's emissions by means of RBF neural network     

刘震涛  费少梅 《浙江大学学报(A卷英文版)》2004,5(8):960-965

Great efforts have been made to resolve the serious environmental pollution and inevitable declining of energy resources. A review of Chinese fuel reserves and engine technology showed that compressed natural gas (CNG)/diesel dual fuel engine (DFE) was one of the best solutions for the above problems at present. In order to study and improve the emission performance of CNG/diesel DFE, an emission model for DFE based on radial basis function (RBF) neural network was developed which was a black-box input-output training data model not require priori knowledge. The RBF centers and the connected weights could be selected automatically according to the distribution of the training data in input-output space and the given approximating error. Studies showed that the predicted results accorded well with the experimental data over a large range of operating conditions from low load to high load. The developed emissions model based on the RBF neural network could be used to successfully predict and optimize the emissions performance of DFE. And the effect of the DFE main performance parameters, such as rotation speed, load, pilot quantity and injection timing, were also predicted by means of this model. In resume, an emission prediction model for CNG/diesel DFE based on RBF neural network was built for analyzing the effect of the main performance parameters on the CO, NOx emissions of DFE. The predicted results agreed quite well with the traditional emissions model, which indicated that the model had certain application value, although it still has some limitations, because of its high dependence on the quantity of the experimental sample data.  相似文献   

图书馆知识管理的内容和实施策略   总被引：2，自引：0，他引：2  

安月玲 《河北职业技术学院学报》2004,4(4):69-70

知识管理是图书馆面临的一个新课题。阐述图书馆知识管理的内容，并提出图书馆知识管理的实施策略。  相似文献   

企业绩效评价指标体系中存在的问题及改进建议   总被引：5，自引：0，他引：5  

彭晓洁 《商丘职业技术学院学报》2006,5(4):24-25

企业绩效评价就是按照企业目标设计相应的评价指标体系,对企业一定经营期间的经营业绩做出客观、公正和准确的综合判断。通过分析我国现行企业绩效评价指标体系中存在的问题,提出了相应的改进建议。  相似文献   

价值与价值评价：主客体关系的深层思考   总被引：1，自引：0，他引：1  

朱志君 《辽宁师范大学学报(社会科学版)》2003,26(1):1-6

价值是属于主客体之间深层关系的范畴，它所揭示的是主体需要与客体属性之间的一种特定关系。价值评价是价值主体对客体属性能否和在多大程度上满足自身需要的一种肯定或否定的判断。价值与价值评价，从更深层意义上反映着主客体之间的关系，也是价值哲学研究的重要基础理论问题。建立科学的价值与价值评价观，是建立马克思主义价值哲学体系的重要前提。  相似文献   

Numerical investigation of microtexturing rings’ structure on the friction performance of bearing cells     

PENG Yun-feng  KANG Shuang-yang  SU Xing 《重庆大学学报(英文版)》2017,16(3):98-112

We presented a numerical examination of the effect of microtexturing negative rings’ structure on the tribological performance of parallel bearing couples’ cell. Three mcirotexturing rings, which are circle, square and ellipse, were chosen and the analysis model were established. We used the Reynolds equation coupled with finite difference method and successive over relaxation Gauss-Seidel iterative method to solve the Newtonian flow’s hydrodynamics within a bearing couple. The effect of texture density and radius ratio (thickness) of the microtexturing rings were investigated on the tribological performance under the similar operating conditions. The numerical simulation reveals that: 1) The microtexturing rings’ structure can homogenize the local pressure much uniformly within the bearing cell. 2) The tribological performance is determined mainly by the microtexturing rings’ geometry and texture density, and the thickness of the rings’ structure can help to change the quantitative values. 3) The square and circle rings’s microtexturing surface can slightly improve the frictional performance with the bearing cells’ gap, while the ellipse ring’s surface may decrease the frictional performance. 4) The ellipse rings’ microtexturing surface can achieve the minimum spacing gap but the maximum friction coefficient of the bearing couple, and then the circle and square rings’ structure take the second and third place, respectively  相似文献   

昆明大学2002～2006年发表论文的计量分析   总被引：1，自引：0，他引：1  

徐燕  杨茂泉 《昆明大学学报》2008,19(4):112-114

运用文献计量学方法,以《中国期刊全文数据库》为数据源,对昆明大学2002—2006年在国内公开刊物上发表的学术论文进行定量和定性研究,提供各项数量和质量指标统计数据和测评结果,为客观评价学院科研实力和学术水平,为昆明学院下一步教学、科研建设及人才培养,提供客观依据和决策参考。  相似文献   

简论创新教学的教学设计     

何文茜 《石家庄学院学报》2001,3(4):74-76

培养学生的创新素质必须实施创新教学,进行创新教学的教学设计是实施创新教学的重要保证,搞好教学评价是优化创新教学的重要环节.  相似文献   

司法裁判视域中的利益衡量论略     

朱良好 《辽宁师范大学学报(社会科学版)》2008,31(4):26-29

利益衡量应当是法律适用中的普遍方法。其基本的思维路向和操作模式是贯通事实与规范以及在规范事实与案件事实之间进行比较。尽管可能带有不确定性,但确定性只是人们对司法抱持的价值期待,而不是司法的本真属性。裁判的妥当性和个案公正,既是可欲的,也恰恰是利益衡量所追求的。  相似文献