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2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity (EMC, SI & PI)最新文献

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Basics of Medical EMC 医疗EMC基础知识
D. P. Ray
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引用次数: 0
Numerical Study on MRI RF Heating for Circular External Fixators under 1.5T MRI 1.5T MRI下圆形外固定物MRI射频加热数值研究
Xin Huang, Zhichao Wang, Ji Chen, Jianfeng Zheng
Tissue heating due to radio frequency (RF) energy absorption in human body for patients in a Magnetic Resonance Imaging (MRI) environment is one of the primary concerns about MRI related safety issues for patients, especially with the presence of sizable metal implants such as circular external fixation devices. This paper proposes a novel method to evaluate the MRI RF induced heating effects of circular external fixation devices utilizing an innovative leg phantom. A number of essential geometrical parameters, i.e. number of screws and wires, ring frame diameter, strut length, and insertion angle were numerically investigated to study the RF induced heating mechanism and behaviors of circular external fixation devices. Numerical results suggest that non-wire configuration with fewer screws, large ring frame size, relatively large strut length and the maximum insertion angle pointing outwards may lead to the worst case MRI RF coil induced heating. The peak spatial average specific absorption rate (SAR) over 1 gram can approach 341.3 W/kg with a 2 W/kg whole body SAR.
在磁共振成像(MRI)环境中,由于患者体内射频(RF)能量吸收引起的组织加热是患者MRI相关安全问题的主要关注点之一,特别是存在较大的金属植入物,如圆形外固定装置。本文提出了一种新的方法来评估环形外固定装置的MRI射频诱导加热效应,利用创新的腿模。为了研究圆形外固定装置的射频加热机理和行为,对螺钉和导线数量、环架直径、支撑杆长度和插入角度等重要几何参数进行了数值模拟。数值结果表明,螺杆数量少、环架尺寸大、支撑杆长度较大、最大插入角朝外等非丝结构可能导致最坏情况下的MRI射频线圈发热。1克以上的峰值空间平均比吸收率(SAR)可达341.3 W/kg,全身SAR为2 W/kg。
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引用次数: 1
Development of Polynomial Chaos Based Surrogate Models for Channel Simulation 基于多项式混沌的信道仿真代理模型的发展
M. A. Dolatsara, J. Hejase, D. Becker, M. Swaminathan
Improvements in high frequency signal transmission places requirements on meticulous jitter modeling and prediction techniques, which have to provide precision below 1 ps. In general timing jitter is divided into random and deterministic jitter, where the latter includes data dependent jitter, which is the focus of this paper, since it can be the dominant cause of jitter and it has proven to be challenging to model. Traditionally, jitter arising in eye-diagrams of high speed channels is modeled using a transient simulation with a length of thousands or millions of bits. This approach can be very time consuming. Hence, statistical eye analysis techniques are developed, providing for fast prediction of eye diagram and jitter [1]. However these techniques are only applicable to linear systems, which can be an important constituent for jitter in high speed channel simulation.
高频信号传输的改进对精细的抖动建模和预测技术提出了要求,这些技术必须提供低于1ps的精度。一般来说,时序抖动分为随机抖动和确定性抖动,后者包括数据相关抖动,这是本文的重点,因为它可能是抖动的主要原因,并且已被证明是具有挑战性的建模。传统上,高速通道眼动图中产生的抖动是使用数千或数百万比特的瞬态仿真来建模的。这种方法可能非常耗时。因此,开发了眼统计分析技术,提供了快速预测眼图和抖动的方法[1]。然而,这些技术只适用于线性系统,这可能是高速信道仿真中抖动的重要组成部分。
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引用次数: 0
Microscopic Field Effects at the NanoScale Level and Their Implications for Device Design in High-Speed Electronics 纳米尺度下的微观场效应及其对高速电子器件设计的意义
C. Krowne
Materials & Devices - Microscopic Effects Important • Phase Change & Metal-Insulation Transition Materials • Superconductive Materials & Devices • Nanowires, NanoTubes, and NanoCables (1D systems) • Electric Materials & Devices 1. Ferroelectric (FM), 2. Ant-FE, and electron charge effects like Coulomb blockage • Negative Index Materials • Magnetic Materials & Devices 1. Ferromagnetic (FM), 2. Ferrimagnetc (FiM), 3. Ant-FM and 4. Correlated electron system magnetics • Single and few atomic layered materials; e.g., graphene, BN, MoS2 (2D systems) • Topological Insulators
材料与器件-微观效应重要•相变和金属绝缘过渡材料•超导材料与器件•纳米线,纳米管和纳米电缆(1D系统)•电气材料与器件铁电(FM), 2。反fe和电子电荷效应,如库仑堵塞•负指数材料•磁性材料与器件2.铁磁(FM);3.铁磁(FiM);抗fm和4。•单原子和少原子层状材料;例如,石墨烯,BN, MoS2 (2D系统)•拓扑绝缘体
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引用次数: 0
An Update on U.S. and Canada Wireless Rulemakings 美国和加拿大无线规则制定的最新情况
G. Kiemel
This article consists only of a collection of slides from the author's conference presentation.
本文仅由作者在会议上发表的一些幻灯片组成。
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引用次数: 0
EMI Modeling and Reduction in Modern Power Electronics Systems 现代电力电子系统中的电磁干扰建模与降低
Shuo Wang
A. EMI Measurement
A.电磁干扰测量
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引用次数: 4
Measurements of Wireless Devices in Reverberation Chambers 混响室中无线设备的测量
D. Senic, K. Remley
This article consists only of a collection of slides from the author's conference presentation.
本文仅由作者在会议上发表的一些幻灯片组成。
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引用次数: 1
Changes to ISO/IEC 17025:2017 A High-Level Overview ISO/IEC 17025:2017高级概述的变化
Trace McInturff
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引用次数: 0
Estimating Reverberant Electromagnetic Fields in Populated Enclosures by Using the Diffusion Model 用扩散模型估计密集围场中的混响电磁场
J. Yan, J. Dawson, A. Marvin
The ability of an enclosure to protect its contents from electromagnetic interference is quantified by its shielding effectiveness. Previous research has proved that the contents of an enclosure may greatly change the internal field and thus the shielding effectiveness. The power balance method is an efficient approach to analyze shielding problems of populated enclosures. One assumption of the power balance method is that in the steady state, the electromagnetic field in an enclosure is homogeneous. In actual circumstances, however, the presence of losses in an enclosure often compromises the field homogeneity and the power balance method may become inaccurate. A diffusion equation approach has been previously proposed to overcome this problem. In this paper, we predict the internal electromagnetic field of a populated enclosure by using the diffusion model, and compare them with the fields obtained by the power balance method, a fullwave electromagnetic solver and measurements, to demonstrate its efficacy. Comparisons between the diffusion model and the power balance method show that for populated enclosures, the internal electromagnetic field varies with position and that the diffusion model allows this to be observed.
外壳保护其内容物免受电磁干扰的能力是通过其屏蔽效能来量化的。以往的研究已经证明,外壳的内容物可以极大地改变内部场,从而改变屏蔽效果。功率平衡法是分析密集围场屏蔽问题的有效方法。功率平衡法的一个假设是,在稳定状态下,箱体内的电磁场是均匀的。然而,在实际情况下,外壳中损耗的存在往往会损害场的均匀性,并且功率平衡方法可能变得不准确。先前已经提出了一种扩散方程方法来克服这个问题。本文利用扩散模型预测了密集围场的内部电磁场,并将其与功率平衡法、全波电磁求解器和测量得到的电磁场进行了比较,验证了扩散模型的有效性。扩散模型和功率平衡方法的比较表明,对于密集的外壳,内部电磁场随位置的变化而变化,扩散模型允许观察到这一点。
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引用次数: 3
IEC View of Transient Immunity Testing IEC暂态抗扰度测试的观点
T. Braxton
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引用次数: 0
期刊
2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity (EMC, SI & PI)
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