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31.
介绍了轿车车内空腔声学模态,对实车的声模态进行了测试与分析,获得了车内空腔的声学共鸣频率和模态形状;提出了利用LMSTest_lab对轿车车内空腔声学模态进行测试的试验方法,为车内空腔的低频噪声研究提供了参考。 相似文献
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结合实例,利用ANSYS有限元软件,采用三维空间有限元模型,对钢筋混凝土框架结构、门式刚架及加层后的整体结构进行了模态分析和谱分析,获得了结构的动力特性和地震作用效应的变化规律,为轻钢加层厂房的应用提供了一定参考。 相似文献
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Curtindale Lori; Laurie-Rose Cynthia; Bennett-Murphy Laura; Hull Sarah 《Canadian Metallurgical Quarterly》2007,43(3):576
Applying optimal stimulation theory, the present study explored the development of sustained attention as a dynamic process. It examined the interaction of modality and temperament over time in children and adults. Second-grade children and college-aged adults performed auditory and visual vigilance tasks. Using the Carey temperament questionnaires (S. C. McDevitt & W. B. Carey, 1995), the authors classified participants according to temperament composites of reactivity and task orientation. In a preliminary study, tasks were equated across age and modality using d= matching procedures. In the main experiment, 48 children and 48 adults performed these calibrated tasks. The auditory task proved more difficult for both children and adults. Intermodal relations changed with age: Performance across modality was significantly correlated for children but not for adults. Although temperament did not significantly predict performance in adults, it did for children. The temperament effects observed in children-specifically in those with the composite of reactivity-occurred in connection with the auditory task and in a manner consistent with theoretical predictions derived from optimal stimulation theory. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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This paper proposes an adaptive multimodal in‐vehicle information system for safe driving. The proposed system filters input information based on both the priority assigned to the information and the given driving situation, to effectively manage input information and intelligently provide information to the driver. It then interacts with the driver using an adaptive multimodal interface by considering both the driving workload and the driver's cognitive reaction to the information it provides. It is shown experimentally that the proposed system can promote driver safety and enhance a driver's understanding of the information it provides by filtering the input information. In addition, the system can reduce a driver's workload by selecting an appropriate modality and corresponding level with which to communicate. An analysis of subjective questionnaires regarding the proposed system reveals that more than 85% of the respondents are satisfied with it. The proposed system is expected to provide prioritized information through an easily understood modality. 相似文献
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标准化形式的理论谱系创建 总被引:1,自引:0,他引:1
本文对标准化形式的确定所面临的困惑进行了讨论,应用标准化的理性概念和标准化公理,推论和演绎出了20种标准化的理想形态,并对4个标准化公理进行分析,用两个标准化公理的4种关系和20种标准化理想形态,构建了标准化形态的理论谱系矩阵。应用标准化的理论形态对“简化”、“统一化”、“通用化”、“系列化”、“组合化”、“模块化”、“互换性”等原认为的标准化形态进行了理论验证,应用标准化形式的理论谱系对语言、文字、信息传输的标准化关系进行了解释。 相似文献
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Barbara G. Delano Marianna S. Markell Frieda Wolf Ejiro Ugova Eli A. Friedman Moro O. Salifu 《Hemodialysis international. International Symposium on Home Hemodialysis》2002,6(1):54-57
There is limited use of home renal replacement therapies in the U.S.A. One percent of dialysis patients are on home hemodialysis (HHD) and only 9% undergo peritoneal dialysis (PD). In an effort to better understand this, 161 satellite hemodialysis patients in 6 units in Brooklyn were surveyed. Forty‐eight percent of patients were women, 86% were black, 5% white, 8% Hispanic, and 1% other. Mean age was 49.4 years (range 22 – 69 years). Etiology of renal disease was hypertension (41%), diabetes mellitus (31%), polycystic kidney disease (3%), systemic lupus erythematosus (4%), and other or unknown (21%). Patients were queried about knowledge of and attitudes toward home therapies. Seventy‐nine percent of patients knew of home dialysis. The source of this information was the nephrologist (59%), the social worker (14%), a nurse (8%), other patients (4%), and other sources (15%). Only 10% of patients had ever considered HHD. Fifty‐four percent were afraid to do self‐care at home and 35% were not interested. Surprisingly, only 3% felt they had no reliable helper and 8% felt that their housing was not suitable. Similarly, 78% of patients had been spoken to about PD, but only 11% had considered it. Forty‐one percent were afraid of doing self‐care on PD, and 45% were not interested. We conclude that, although the majority of patients in six inner‐city dialysis units had heard of home dialysis, only a small number ever considered it. As many patients were afraid of doing home therapy, better education about the risks and benefits needs to be disseminated. 相似文献
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For oil production fields, there is a need for downhole measurements of the gas/water/oil multiphase flow. In extreme conditions a relatively simple, robust, and non-intrusive system will be appropriate. A measurement setup that combines multiple gamma beam (MGB) and dual modality densitometry (DMD) measurements, would be able to determine the gas volume fraction (GVF) independently of the flow pattern, and monitor changes in water salinity. MGB measurements of gamma-ray transmission along multiple sections across the oil pipe will provide information on the flow pattern. Whereas the DMD principle will give information on changes in salinity from a combination of transmission and scattering gamma-radiation measurements. In this work we present the results from MGB and DMD measurements of a multiphase flow with high-speed gamma-ray tomograph measurements as reference for the flow pattern. The MGB measurements should enable us to distinguish between stratified or wavy/slug and annular or slug flow. Flow patterns with several minor components distributed evenly over the measurement cross section, like bubble flow, will be interpreted as homogeneous flow. The DMD measurements can be used to monitor salinity changes of the water component for intervals where the GVF is low and the water cut of the liquid is high. Combined with other gauges for water cut measurements, the MGB and DMD measurement setup should improve the multiphase flow measurements, and enable increased oil/gas recovery and production water monitoring. 相似文献