Results 21 to 30 of about 4,798 (162)

Design of RF Transmit and Receive Coils for Low Field MRI [PDF]

open access: yes, 2016
在临床医学应用中磁共振成像技术已经很普及,它成为现代医学影像领域中重要的医学影像检查手段。射频线圈在磁共振系统用来发射和接收射频信号的重要器件,对成像质量有着很关键的作用。水平场系统低场磁共振成像设备的射频线圈结构和高场磁共振设备中使用的射频线圈由于主磁场方向的不同存在着很大的差异。垂直场下射频发射线圈的设计难度相对比较大,相控阵线圈能够获得较大成像区域的同时也具有较高的信噪比,而且相控阵线圈还能够应用于并行成像技术,加快成像速度。国内对低场磁共振开放式射频发射线圈和相控阵线圈技术的研究都比较少 ...
温桢荣
core  

Smart Biomaterials and Dressings for the Treatment of Chronic Inflammatory Skin Diseases

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Chronic inflammatory skin diseases, encompassing immune‐inflammatory conditions and infection‐associated dermatoses, pose significant clinical challenges due to high prevalence, recurrence, and therapeutic resistance, affect over 30% of the global population.
Zehao Lan   +5 more
wiley   +1 more source

长宁地区岩石圈磁场磁偶极子反演研究

open access: yesDizhen xuebao
四川长宁地区平均点距间隔2 km的952个测点测得的岩石圈磁场空间分布结果显示,长宁背斜内东西部存在显著的磁场分布差异,且该差异可能与地震活动区域相关,例如:背斜内部对应岩石圈磁场正值区域,背斜边界对应负值区域;背斜的西北边界区域对应最显著的岩石圈磁场负值,背斜东北侧以岩石圈磁场正值分布为主,背斜南侧以岩石圈磁场负值为主。基于上述岩石圈磁场数据,我们构建了区域磁偶极子反演的技术途径以开展磁偶极子源的反演研究。具体途径为:将化极后的长宁背斜岩石圈磁场进行快速傅里叶变换 ...
Xiaotao Wu, Bin Chen, Chao Dong
doaj   +1 more source

Research on Indoor Inertial Navigation System Based on Magnetic Field SLAM [PDF]

open access: yes, 2016
捷联式惯性导航系统解决了GPS在室内定位中的难点,同时它避免了对外部信号源的依赖,使用起来更加方便灵活。然而惯性导航系统存在着误差积累,尤其是陀螺仪的误差,由于没有可靠的观测量,导致航向误差是导航系统中主要存在的误差。而地球磁场作为一种免费的资源,己经被人类应用于导航与定位应用中。但是到目前为止,这些研究基本都是需要事先准备好室内的磁场地图。本文旨在缺失室内磁场地图的情况下,拟设计一种基于磁场SLAM辅助的惯性导航系统的方法来解决上述问题。 本文将基于卡尔曼滤波惯性导航航位推算的基础上 ...
黄民政
core  

Giant Tunability of Individual Magnetic Skyrmion Size via an Oscillating Local Magnetic Field

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Magnetic skyrmions hold great promise as memory and computing elements in future spintronic devices. Despite the demonstration of various devices, techniques for addressable and high‐precision manipulation of individual skyrmions remain scarce.
Cai‐Hong Xie   +13 more
wiley   +1 more source

纵磁结构真空灭弧室的三维磁场数值分析

open access: yesGaoya dianqi, 1999
根据单积分法原理编制了一套三维磁场计算软件,对杯状纵磁、1/2匝线圈纵磁、四极纵磁三种结构的真空灭弧室自生纵向磁场进行了三维数值分析,给出磁场的总体分布以及几个主要参数对磁场分布的影响,并且对其中两种结构的磁场进行实际测量,验证了该软件计算的准确性.
付军   +4 more
doaj  

Methods and Applications for the Modulation of Surface Plasmon-Coupled Emission Signal [PDF]

open access: yes, 2016
表面等离子体耦合荧光(Surfaceplasmon-coupledemission,SPCE)是一种利用纳米金属薄膜表面的自由电子与其近场范围内的荧光分子相互作用而产生信号的特殊的纳米光学现象,因其具有定向发射、高度偏振、波长分辨、距离依赖和背景抑制等独特性质而受到了广大分析研究工作者的广泛关注。SPCE发射信号具有强定向性,使得信号的收集效率大大提高,且可在信号产生过程中获得等离子体电磁场增强,荧光增强极为显著。近年来,随着对检测要求的逐渐提高,进一步增强SPCE信号,提高体系检测灵敏度显得尤为重要 ...
谢凯信
core  

Composite‐Field Annealing Enables Superior High‐Temperature Noise Stability in Fluxgate Sensors With Co‐Rich Amorphous Microwires

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Fluxgate sensors with Co‐rich amorphous microwires, widely used for their low noise in magnetic field measurements, encounter significant challenges in high‐temperature environments such as well drilling and geological exploration. Prolonged thermal aging degrades the performance of Co‐rich amorphous microwires, resulting in increased noise ...
Lining Pan   +10 more
wiley   +1 more source

Dynamic Analysis of Protein’s Conformational Transition by the Single Molecular Manipulation of Magnetic Tweezers [PDF]

open access: yes, 2016
磁镊技术可以在单分子的尺度上对生物大分子进行长时间的稳定力学拉伸实验,因此对于研究蛋白质的构象转变动力学问题提供了最为直接有效的方法和手段。本课题选用肌联蛋白作为单分子实验的目标蛋白。肌联蛋白是一种典型的力学性蛋白。它连接肌小节的两端,在肌肉的被动弹性及肌肉收缩中扮演极其重要的角色。之前关于肌联蛋白的单分子力学研究主要是基于AFM单分子力谱。然而,由于AFM设备本身在稳定性方面的限制,其之前研究的力学范围多集中于100pN以上。因此,肌联蛋白在0-100pN区间的动力学数据至今仍是一片空白 ...
袁国华
core  

Multifunctionality of Magnetic La(Fe, Si/Al)13‐Based Materials: Negative Thermal Expansion and Magnetocaloric Effect

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT In recent years, the field of magnetic materials has witnessed a paradigm shift from single‐function applications to multifunctional integration, driven by the growing demand for smart materials in advanced technologies. Among various magnetic systems, La(Fe, Si/Al)13‐series materials have emerged as particularly promising candidates due to ...
Irfan Liaquat   +2 more
wiley   +1 more source

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