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排序方式: 共有690条查询结果,搜索用时 15 毫秒
41.
The purpose of this article is to explore in details the theoretical and numerical aspects of the behavior of spatial trusses, undergoing large elastic and/or elastoplastic strains. Two nonlocal formulations are proposed in order to regularize the problem, avoiding the mesh dependence of the numerical response. The classical example of a simple bar in tension is chosen to explore the various features of the proposed models and to highlight the interplay between material and geometrical nonlinearity in the localization.Aknowledgement The financial support of FAPESP, a Brazilian research funding agency and of the italian miur, project prin 2003082105, are greatly appreciated. 相似文献
42.
Sun Guolin Guo Wei 《电子科学学刊(英文版)》2006,23(3):413-416
This paper studies the relationship between mobility, navigation and localization in the context of wireless sensor networks with mobile beacons. It is observed that mobility can aid in network node localization and that once localized, the network nodes can localize and track a mobile object and guide its navigation. A distributed kernel-based algorithm is proposed that enables the nodes to establish confident position estimates in the presence of ranging inaccuracies. The proposed approach features robustness with respect to range measurement inaccuracies, low complexity and distributed implementation, using only local information. Simulation validates our approach viable. 相似文献
43.
This paper describes a method for absolute localization and environment recognition for an autonomous, sonar-equipped robot. The addition of an auto-associative memory to previously developed non-neural map making software results in a system that is capable of recognizing its environment and its position within the environment using remembered features and room geometry. In the prior system the robot used sonar to construct a metric map of an environment, but the map information had to be reconstructed each time the robot returned to an environment. We evaluated the system with a task that requires memory of the position of a goal that is not directly detectable by sonar. 相似文献
44.
Ignacio Garcia 《Machine Translation》2007,21(1):55-68
Web-based translation memory (TM) is a recent and little-studied development that is changing the way localisation projects
are conducted. This article looks at the technology that allows for the sharing of TM databases over the internet to find
out how it shapes the translator’s working environment. It shows that so-called pre-translation—until now the standard way
for clients to manage translation tasks with freelancers—is giving way to web-interactive translation. Thus, rather than interacting
with their own desktop databases as before, translators now interface with each other through server-based translation memories,
so that a newly entered term or segment can be retrieved moments later by another translator working at a remote site. The
study finds that, while the interests of most stakeholders in the localisation process are well served by this web-based arrangement,
it can involve drawbacks for freelancers. Once an added value, technical expertise becomes less of a determining factor in
employability, while translators lose autonomy through an inability to retain the linguistic assets they generate. Web-based
TM is, therefore, seen to risk disempowering and de-skilling freelancers, relegating them from valued localisation partners
to mere servants of the new technology. 相似文献
45.
40000m~3/h空分设备主换热器的设计及制造 总被引:1,自引:0,他引:1
通过对进口 4 0 0 0 0m3 /h空分设备主换热器进行结构分析及对比模拟计算 ,用国产传热翅片进行设计、采用真空钎焊工艺制造的主换热器 ,经并网运行 ,设计指标优于原空分设备 ,为今后成套大型空分设备板翅式换热器国产化设计、制造创造了条件。 相似文献
46.
鼻咽癌药物我成像定位仪的光学设计 总被引:9,自引:1,他引:8
对药物荧光鼻咽癌定位的光学系统进行理论分析,给出了该系统的光学设计方法和设计结果。光学系统设计包括,激光器出射光束与光纤高效率耦合技术,同光轴非接触两光纤间的光束耦合技术以及获得较好的像清晰度和衬度的技术。 相似文献
47.
浅谈大型苯酐顺酐装置反应器包国产化 总被引:1,自引:0,他引:1
介绍引进大型苯酐顺酐装置固定床反应器包的两种结构;简述该反应器包在设计、材料、制造方面的关键问题;分析反复引进技术的利弊;通过论证认为,该大型反应器包国产化是完全可行的,并指出尚需解决的技术问题。 相似文献
48.
49.
The degradation of urethane topcoat/epoxy primer systems used for military aircraft and industrial applications were monitored using the electrochemical noise method and measured with embedded electrodes. The degradation was induced by the ac-dc-ac method. The trend in the noise resistance parameter was consistent with the trend in the low frequency impedance modulus obtained from electrochemical impedance spectroscopy experiments. The localization index was not informative about the corrosion mechanism. However, the two shot noise parameters, average charge of event and event frequency, were able to characterize the corrosion process beneath the coating. There was a change from uniform corrosion to localized corrosion on the metal substrate associated with the aircraft coating as indicated by the decrease in frequency event as this coating failed. There was an increase in the charge per corrosion event of the substrate of the industrial coating indicating that the uniform corrosion occurring became more severe as the coating failed. 相似文献
50.
A study of mechanical shear bands in liquids at high pressure 总被引:2,自引:2,他引:0