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为避免误踩油门当刹车,利用电磁感应设计了智能识别系统,该系统利用单片机和传感器对误踩和正常踩油门踏板情况进行了判别,进而对车辆进行了控制,有效地降低了由此引发的事故率. 相似文献
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传统的可穿戴式健康监护终端多采用恒定的无线发射电平,普遍存在较为严重的功耗问题。研制了以MSP430F149微控制器和低功耗蓝牙通信为核心的人体监护终端,能在不同环境下无创、实时监测和记录人体心电、血氧、血压等特征数据;采用改进的无线功率调控方案优化无线通信和数据传输,以最优服务质量QoS、信号强度RSSI和最小误包率PER为指标,优化监护终端的功率消耗。测试结果表明,监护终端功耗差别不超过1.58mW时,改进的无线功率调控方案具有更强的信号强度RSSI和更小的误包率PER。 相似文献
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提出一种系统探测的逻辑控制方案.该方案以FPGA设计技术为核心,基于模块化编程思想,实现整个系统的逻辑控制功能.通过计算机仿真和实际电路测试,给出ens、ad_elk、oe、hbe等关键信号的逻辑时序仿真和测试波形.信号处理通道转换、电路延时、功耗等指标分析与测试表明,设计具有实时性、高集成度、高可靠性、低功耗和灵活性等特点. 相似文献
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为了有效地减少由可燃气泄漏导致的损失和加强对可燃气使用的安全监测,提出了一种基于无线传感网络的可燃气监测系统;该系统主要由可燃气体无线监测节点和移动监控终端构成,其中无线监测节点是以8位超低功耗微处理芯片ATmega1281、2.4 GHz射频芯片AT86RF230和通用可燃气体传感器MQ-2为核心器件,基于tinyos2.0平台利用nesC语言设计完成节点感知程序;移动监控终端选用ARM处理器S5PV210,并基于安卓4.2平台设计实现实时报警、移动监控、动态显示等功能;试验结果表明,该系统具有布设简单、测量精度高、功耗低等优点,误警率不超过0.5%并可持续工作180天。 相似文献
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对于汽车电子油门踏板利用可编程霍尔传感器将踏板的位置变化转换为线性模拟电压输出,具有产品一致性好、寿命长等优点正越来越获得广泛应用;针对踏板磁钢片位置布局不良容易导致的传感器校准异常和输出非线性等问题,进行了踏板旋转件永磁磁路分析,并用ANSYS软件进行了磁场有限元建模仿真,分析了踏板旋转角度和传感器位置安装之间的影响因素,并在电子油门性能检测平台上进行了实验验证;实验结果表明,双路输出式电子油门踏板的输出线性度达到1.45%,同步度指标为0.12%,符合产品技术标准。 相似文献
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A. H. Taub 《General Relativity and Gravitation》1979,10(12):1009-1009
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Ugeda MM Fernández-Torre D Brihuega I Pou P Martínez-Galera AJ Pérez R Gómez-Rodríguez JM 《Physical review letters》2011,107(11):116803
Understanding the coupling of graphene with its local environment is critical to be able to integrate it in tomorrow's electronic devices. Here we show how the presence of a metallic substrate affects the properties of an atomically tailored graphene layer. We have deliberately introduced single carbon vacancies on a graphene monolayer grown on a Pt(111) surface and investigated its impact in the electronic, structural, and magnetic properties of the graphene layer. Our low temperature scanning tunneling microscopy studies, complemented by density functional theory, show the existence of a broad electronic resonance above the Fermi energy associated with the vacancies. Vacancy sites become reactive leading to an increase of the coupling between the graphene layer and the metal substrate at these points; this gives rise to a rapid decay of the localized state and the quenching of the magnetic moment associated with carbon vacancies in freestanding graphene layers. 相似文献
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We study the relation between the centro-affine geometry of star-shaped planar curves and the projective geometry of parametrized maps into RP1. We show that projectivization induces a map between differential invariants and a bi-Poisson map between Hamiltonian structures. We also show that a Hamiltonian evolution equation for closed star-shaped planar curves, discovered by Pinkall, has the Schwarzian KdV equation as its projectivization. (For both flows, the curvature evolves by the KdV equation.) Using algebro-geometric methods and the relation of group-based moving frames to AKNS-type representations, we construct examples of closed solutions of Pinkall’s flow associated with periodic finite-gap KdV potentials. 相似文献
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《Surface science》1986,171(1):103-110
Cl2 layers adsorbed on Grafoil have been investigated by X-ray diffraction between 78 and 285 K. Mono- and submonolayers crystallize in a parallelogram lauttce, incommensurate with the (001) graphite surfaces, the molecules oriented almost perpendicular to the surface. The structure is closely related to that of the (001) planes of three-dimensional solid chlorine. For coverages above the monolayer completion bulk crystalization sets in. 相似文献
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In this note we use some of the results of [3] to derive a general duality theorem for the cohomologies of foliated structures on a manifold. The result is applied to the special case of a symplectic manifold M on which the foliation is given by a complex polarization F in the sense of geometric quantization. We obtain, for example, a rigorous proof of the fact that for a smooth function ƒ on M whose Hamiltonian vector field leaves F invariant, the spectrum of the corresponding prequantization operator v(ƒ) coincides with the spectrum of its transpose, under the above duality. This latter result was obtained by Simms in [12] under certain hypotheses. Proofs of the validity of those hypotheses are now available in the literature; cf. [3] and [7]. 相似文献
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Valfells A. Verboncoeur J.P. Lau Y.Y. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2000,28(3):529-536
Analyzes the effects of space charge shielding on the steady state of a multipactor discharge on a dielectric. Analytic methods are used to obtain an exact function for the potential in the discharge, assuming a Maxwellian distribution of emitted electrons. An equation for the amount of power deposited on the dielectric by the multipactoring electrons, for a given saturation level, is given. A simple method for obtaining the saturation level, for a given material, is obtained 相似文献