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排序方式: 共有113条查询结果,搜索用时 31 毫秒
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V. M. García A. Vidal V. E. Boria A. M. Vidal 《International journal for numerical methods in engineering》2006,65(11):1773-1788
In this paper, a special purpose algorithm for solving large eigenvalue problems based on the Lanczos method is successfully applied to an engineering problem: the electromagnetic analysis and design of passive waveguide devices. For dealing with such complex problems, the boundary integral‐resonant mode expansion (BI‐RME) technique has been recently proposed. This technique solves integral equations (IEs) through the well‐known method of moments (MoM), thus leading to structured eigenvalue problems. These problems frequently become very large when solving complex arbitrary geometries with high accuracy. In such cases, the eigenvalue problem cannot be efficiently solved with standard methods by means of personal computers, essentially due to CPU time and memory allocation requirements. In this paper, we propose an alternative technique, based on the Lanczos method, for the fast and accurate solution of large BI‐RME generalized eigenvalue problems. The novel theoretical aspects of this approach, as well as the impacton the original BI‐RME formulation, are described. Comparative benchmarks are also successfully presented for the full‐wave analysis and design of real passive microwave devices. Copyright © 2005 John Wiley Sons, Ltd. 相似文献
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介绍了集"日常管理"、"水平评估"、"决策规划"三位于一体的数字校园设计方案。通过规范基础数据,采用ESB整合各业务子系统,解决"信息孤岛"问题,并为状态数据采集提供便利。利用BI软件进行数据挖据,为管理者进行科学规划和决策提供数据支持。系统采用单点登录,个性化的门户展现满足了各类用户对资源和服务的需求。 相似文献
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汪永松 《电脑编程技巧与维护》2011,(5):43-47
详细介绍了在商业智能(BI)业务的ETL环节中,高效地提取单机系统中的DBF数据库的实践过程。不仅可以了解将单机系统改造成数据中心平台的实践过程,而且能掌握商业智能业务中ETL环节的实施模式和技巧。 相似文献
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本文从"CI"与"VI"的涵义、高职院校进行视觉形象设计的必要性及高职院校视觉形象设计的构思三方面入手进行了详细地论述,旨在说明高职院校视觉形象设计对挖掘学校的精神、办学理念,提高校园的文化格调,塑造学校良好形象的重要性和时代意义。 相似文献
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基于Philips公司的一体化芯片SAA7130HL,提出一种以其为核心的CPCI接口视频采集卡的设计方法。此视频采集卡采用8块一体化芯片SAA7130HL,通过PCI-to-PCI桥芯片PCI2050BI扩展成8路设备,实现了8路视频采集,可在恶劣条件下工作。 相似文献
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ERP—实现制造企业资源信息化管理的有效途径 总被引:1,自引:1,他引:1
介绍了ERP(企业资源计划管理 )的概念 ,分析了制造企业实施ERP的必要性。对制造企业ERP的系统功能组成和实施模式进行了详细论述 ,最后分析了其发展趋势 相似文献
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Lutein Prevents High Fat Diet‐Induced Atherosclerosis in ApoE‐Deficient Mice by Inhibiting NADPH Oxidase and Increasing PPAR Expression
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Hao Han Wei Cui Linzhi Wang Yufang Xiong Liegang Liu Xiufa Sun Liping Hao 《Lipids》2015,50(3):261-273
Epidemiological and experimental studies provide supportive evidence that lutein, a major carotenoid, may act as a chemopreventive agent against atherosclerosis, although the underlying molecular mechanisms are not well understood. The main aim of this study was to investigate the effects of lutein on the alleviation of atherosclerosis and its molecular mechanisms involved in oxidative stress and lipid metabolism. Male apolipoprotein E knockout mice (n = 55) were fed either a normal chow diet or a high fat diet (HFD) supplemented with or without lutein for 24 weeks. The results showed that a HFD induced atherosclerosis formation, lipid metabolism disorders and oxidative stress, but noticeable improvements were observed in the lutein treated group. Additionally, lutein supplementation reversed the decreased protein expression of aortic heme oxygenase‐1 and increased the mRNA and protein expressions of aortic nicotinamide‐adenine dinucleotide phosphate oxidase stimulated by a HFD. Furthermore, the decreased mRNA and protein expression levels of hepatic peroxisome proliferator‐activated receptor‐α, carnitine palmitoyltransferase 1A, acyl CoA oxidase 1, low density lipoprotein receptors and scavenger receptor class B type I observed in mice with atherosclerosis were markedly enhanced after treatment with lutein. Taken together, these data add new evidence supporting the anti‐atherogenic properties of lutein and describing its mechanisms of action in atherosclerosis prevention, including oxidative stress and lipid metabolism improvements. 相似文献