共查询到20条相似文献，搜索用时 250 毫秒
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为解决光纤传感器易损、测量结果易受外界因素干扰以及布设存活率较低等问题，文章依据布里渊散射原理，基于BOTDA传感技术，通过不锈钢管封装紧皮光纤，自行研制具有监测距离长、精度高、全分布式、耐久性强等优点的不锈钢管智能筋。不锈钢管智能筋具有制备快捷的优点。通过标定不锈钢管智能筋和FRP智能筋的温度和应变灵敏系数进行分析，发现两种智能筋具有良好的温度与应变感知性能；解析试验梁应变监测数据，进行对比分析发现自制不锈钢管智能筋与FRP智能筋的应变监测精度相同，且不锈钢管智能筋的应变监测稳定性优于FRP智能筋。试验结果表明自行研制的不锈钢管智能筋能够解决光纤在粗狂式监测环境中易损的问题，同时具有监测精度高、稳定性好等优点，可对钢筋混凝土结构进行全尺度大范围的监测。 相似文献
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本文论述了布喇格光栅传感枝术在结构安全监测中的研究与应用；并以应变和温度检测为对象分析介绍光纤光栅传感技术的检测原理，方法、参数选择与最新研究成果，文章最后指出工程应用中应注意的一些问题。 相似文献
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光纤光栅传感技术及其应用研究 总被引：1，自引：0，他引：1
文章介绍了目前最先进的一种光纤传感器——光纤光栅传感器的性能、传感的原理及其应用,分析了光纤光栅传感技术应用中存在的缺陷及未来的研究方向 相似文献
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无论是结构的健康监测还是智能结构控制,对结构当前状态的实时测量都是其中必不可少的关键一环,光纤传感器由于其突出的优点而成为智能系统的首选传感器。本文分析了光纤光栅传感器的特点,指出了光纤光栅传感器的工作原理,并总结了光纤光栅传感器在各个领域的应用。 相似文献
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光纤光栅传感器技术应用研究 总被引：2，自引：0，他引：2
传感器作为感知各种结构系统状态变化、获取结构系统信息的重要工具之一,在生产自动化控制、科学技术测试、安全监测、计量贸易等领域发挥着非常重要的作用。传统力学测试、位移测试及温度测试等传感技术多采用电阻应变方法来实现,这种采用电信号测试的方法最大缺点在于易受干扰。进入21世纪,随着高科技的不断发展,国内外正在努力研究一种新的传感技术-光纤光栅传感技术,这种传感技术具有长期稳定性好,干扰小,可测量结构物内部物理量等优点。本文将从光纤光栅定义、光纤光栅传感原理及光纤光栅传感技术应用等方面对这种这种新的传感技术进行研究。 相似文献
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无线传感网络不仅能够为智能实验室的通信提供技术支持,还能够通过Zigbee技术,使智能实验室系统实现对各传感器、探测器设备的管控与监测,从而大大提高了实验室智能管理系统的功能。本设计主要为基于CC2530的无线传感网络,无线传感网络的形状为网状结构,使用了CC2530芯片、CC2591等硬件,然后在构建起硬件的基础之上,使用串口测试工具对所建立的网络进行了测试。 相似文献
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《科技通报》2016,(6)
考虑到在用于对大型结构和工程机械健康监控的系统中,需要对传感器网络的布置进行优化以提高传感器网络精度、可靠性,降低传感网络的成本等问题。本文主要针对光纤光栅传感器网络布置优化问题进行研究,研究传感器布置角度对监测结果的影响,并使用GA算法对传感器布置角度进行优化。常规的GA算法通常存在算法早熟以及局部寻优能力弱等问题。本文提出一种改进型GA算法,通过引入自适应对偶种群、自适应终止规则以及新的生成子代规则来保证种群在迭代过程中的多样性以解决算法早熟问题,并且要提高算法的搜索效率以提高算法对局部寻优的能力。最后通过实验验证本文提出基于改进型GA算法的光纤光栅传感器网布的优化布置方法的有效性。 相似文献
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A novel technique for optimal placement of piezoelectric actuators on smart structures 总被引：3，自引：0，他引：3
The problem of positioning of actuators and sensors on smart materials has been a point of interest in recent years. This is due to the fact that in many practical applications there are limitations in space, weight, etc. of the smart structures, which make the problem of positioning more complex. In addition, it is required that the actuators/sensors have the best possible performance. The development of smart structures technology in recent years has provided numerous opportunities for vibration control applications. The use of piezoelectric ceramics or polymers has shown great promise in the development of this technology. The employment of piezoelectric material as actuators in vibration control is beneficial because these actuators only excite the elastic modes of the structures without exciting the rigid-body modes. This is important since very often only elastic motions of the structures are needed to be controlled. The purpose of this paper is to introduce a novel approach developed for optimizing the location of piezoelectric actuators for vibration suppression of flexible structures. A flexible fin with bonded piezoelectric actuators is considered in this study. The frequency response function (FRF) of the system is then recorded and maximization of the FRF peaks is considered as the objective function of the optimization algorithm to find the optimal placement of the piezoelectric actuators on the smart fin. Three multi-layer perceptron neural networks are employed to perform surface fitting to the discrete data generated by the finite element method (FEM). Invasive weed optimization (IWO), a novel numerical stochastic optimization algorithm, is then employed to maximize the weighted summation of FRF peaks. Results indicate an accurate surface fitting for the FRF peak data and an optimal placement of the piezoelectric actuators for vibration suppression is achieved. 相似文献
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中国遥感卫星地面站是国家重大科技基础设施之一,具备完整的卫星数据接收、传输、存档、处理、分发体系,是我国对地观测领域的核心基础设施之一。地面站的数据接收范围覆盖全国及亚洲的70%疆土。地面站的数据接收系统由天馈伺分系统、跟踪接收分系统、测试分系统、记录与快视分系统、故障诊断分系统、站监控管理分系统、技术支持分系统组成,性能和指标居于世界同类地面站前列。地面站拥有一批国际先进的卫星数据处理与产品生产系统,其产品质量、规格与全球数据产品一致。地面站一系列重要的装置改造和自主创新项目的完成,使卫星数据的接收、处理、存储、检索等系统能力有了显著的提升,可以保证以近实时的速度为用户提供数据产品。地面站运行20余年来,所接收、处理和分发的国内外对地观测卫星数据广泛应用于我国的遥感应用各领域,其中突出的范例有国家重大灾害的监测与评估、全国生态环境质量评价、西部测图、海洋环境近实时监测等国家重大重点项目等。 相似文献
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With the deployment of fifth-generation (5G) wireless networks worldwide, research on sixth-generation (6G) wireless communications has commenced. It is expected that 6G networks can accommodate numerous heterogeneous devices and infrastructures with enhanced efficiency and security over diverse, e.g. spectrum, computing and storage, resources. However, this goal is impeded by a number of trust-related issues that are often neglected in network designs. Blockchain, as an innovative and revolutionary technology that has arisen in the recent decade, provides a promising solution. Building on its nature of decentralization, transparency, anonymity, immutability, traceability and resiliency, blockchain can establish cooperative trust among separate network entities and facilitate, e.g. efficient resource sharing, trusted data interaction, secure access control, privacy protection, and tracing, certification and supervision functionalities for wireless networks, thus presenting a new paradigm towards 6G. This paper is dedicated to blockchain-enabled wireless communication technologies. We first provide a brief introduction to the fundamentals of blockchain, and then we conduct a comprehensive investigation of the most recent efforts in incorporating blockchain into wireless communications from several aspects. Importantly, we further propose a unified framework of the blockchain radio access network (B-RAN) as a trustworthy and secure paradigm for 6G networking by utilizing blockchain technologies with enhanced efficiency and security. The critical elements of B-RAN, such as consensus mechanisms, smart contract, trustworthy access, mathematical modeling, cross-network sharing, data tracking and auditing and intelligent networking, are elaborated. We also provide the prototype design of B-RAN along with the latest experimental results. 相似文献
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[目的/意义] 研究国内外智慧图书馆的知识脉络和未来发展趋势,旨在为我国智慧图书馆发展研究提供参考。[方法/过程] 以CSSCI和Web of Science数据库中有关智慧图书馆研究的文献为数据来源,运用文献内容分析法和知识图谱可视化方法,通过研究国内外智慧图书馆的发展路径、核心作者、关键词共现网络,对关键词聚类知识图谱进行分析,梳理智慧图书馆的知识脉络、研究热点和未来研究趋势。［结果/结论］研究发现,智慧图书馆的研究热点集中在云计算、人工智能技术在图书馆的应用、智慧服务策略探索以及在智慧图书馆的具体实践。未来的研究将围绕技术的融合、智慧服务效能提升、以及智慧图书馆的具体实践3个层面展开。 相似文献
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以大数据应用技术和能源-经济-环境协调发展理论为基础,融合大数据和能源-经济-环境三位一体两种思维,提出能源-经济-环境(3E)大数据平台的框架构想和运营模式,为大数据背景下分析能源、经济、环境复杂系统,挖掘大数据背后所隐藏的关联规则,将不规则、散乱的数据变成政府、企业、研究机构等各类组织的信息资源提供数据支撑、工具支撑、方法论支撑等研究平台。 相似文献
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《International Journal of Information Management》2016,36(5):748-758
The expansion of big data and the evolution of Internet of Things (IoT) technologies have played an important role in the feasibility of smart city initiatives. Big data offer the potential for cities to obtain valuable insights from a large amount of data collected through various sources, and the IoT allows the integration of sensors, radio-frequency identification, and Bluetooth in the real-world environment using highly networked services. The combination of the IoT and big data is an unexplored research area that has brought new and interesting challenges for achieving the goal of future smart cities. These new challenges focus primarily on problems related to business and technology that enable cities to actualize the vision, principles, and requirements of the applications of smart cities by realizing the main smart environment characteristics. In this paper, we describe the state-of-the-art communication technologies and smart-based applications used within the context of smart cities. The visions of big data analytics to support smart cities are discussed by focusing on how big data can fundamentally change urban populations at different levels. Moreover, a future business model of big data for smart cities is proposed, and the business and technological research challenges are identified. This study can serve as a benchmark for researchers and industries for the future progress and development of smart cities in the context of big data. 相似文献
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中国电力资源结构及空间布局优化研究 总被引：12，自引：0，他引：12
电力资源是我国的重要能源,对于维持经济快速发展和改善人民生活水平具有重要的保障作用。从世界其它国家发展看,发电用能源占一次能源比重呈不断上升趋势,在新世纪,我国发电用能源占一次能源比重也将不断上升。我国电力生产始终保持了较高的增长速度,并形成了以火电为主的发电结构,电网互联初规模。但是,与发电资源禀赋结构特点相比,我国电力资源在结构和空间布局上面临一系列问题：如电源结构不合理、水电发展滞后、水能资源空间分布和开发力度不匹配以及电网互连进展缓慢等,特别是水电资源丰富的优势还没有充分发挥出来,电力资源结构和空间布局亟待调整优化。针对上述问题,该文提出了电力资源结构和空间布局调整优化对策：优化电源结构,加大对西南地区水电资源开发力度、积极拓宽水电建设融资渠道和促进电网互联,这对于促进我国电力资源优化配置和生态环境改善都具有十分重要的意义。 相似文献
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Yunmeng Jiang Yanhua Cheng Shunjie Liu Haoke Zhang Xiaoyan Zheng Ming Chen Michidmaa Khorloo Hengxue Xiang Ben Zhong Tang Meifang Zhu 《国家科学评论(英文版)》2021,8(4)
One striking feature of molecular rotors is their ability to change conformation with detectable optical signals through molecular motion when stimulated. However, due to the strong intermolecular interactions, synthetic molecular rotors have often relied on fluid environments. Here, we take advantage of the solid-state intramolecular motion of aggregation-induced emission (AIE) molecular rotors and one-dimensional fibers, developing highly sensitive optical fiber sensors that respond to ambient humidity rapidly and reversibly with observable chromatic fluorescence change. Moisture environments induce the swelling of the polymer fibers, activating intramolecular motions of AIE molecules to result in red-shifted fluorescence and linear response to ambient humidity. In this case, polymer fiber provides a process-friendly architecture and a physically tunable medium for the embedded AIE molecules to manipulate their fluorescence response characteristics. Assembly of sensor fibers could be built into hierarchical structures, which are adaptive to diverse-configuration for spatial-temporal humidity mapping, and suitable for device integration to build light-emitting sensors as well as touchless positioning interfaces for intelligence systems. 相似文献
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While there are several partial solutions to model some aspects of cities (e.g. transportation or energy), there is no framework allowing modelling of a complex system such as a city. This paper aims on providing a solution that can be used by practitioners to model impact of different scenarios and smart city projects encapsulating different subsystems, such as transportation, energetics or, for example, eGovernment. The term “smart cities” is classified into Systems Theory, particularly focusing on Cyber-Physical Systems. This classification is further elaborated to define a new term, so-called Smart City Agent (SCA). The SCA is considered as the main building block for modelling smart cities. The approach within this paper however stresses the interconnection of different systems within a city. Its’ strength is in better exchange of data and among heterogeneous agents. This information management approach is the missing key in the growing market of partial smart city solutions as it will allow simulation of solutions in complex systems such as a city. The suitability of usefulness of the proposed approach is demonstrated on a use case dealing with charging of electrical vehicles. The results show that the approach is suitable for modelling of dynamic behaviour. 相似文献
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中国农业政策对农业支持水平的评估 总被引：6，自引：0，他引：6
本文运用OECD政策评价方法对我国1994—2003年农业支持水平进行了评估。结果表明，我国农业支持水平总体呈上升趋势。20世纪90年代后期农业基础设施投资的大量增加、粮食保护价收购政策的实施使得农业生产者支持水平从2000年起由负值向正值转变。但是与世界发达国家相比，我国的农业支持水平依然很低，政府应进一步加强对农业的支持和保护力度。 相似文献