Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

2.6K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
2.6K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.0K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.0K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

737
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
737
Electro-mechanical Systems01:19

Electro-mechanical Systems

915
Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
915
Electromagnetic Fields01:30

Electromagnetic Fields

2.1K
Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of...
2.1K
Van de Graaff Generator01:15

Van de Graaff Generator

1.7K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
1.7K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

The JAK/STAT pathway: key mechanism in gene activation, disease regulation, and emerging therapeutic targets.

Molecular biology reports·2026
Same author

First observation of dual electrical-optical percolation in metallic nanowire networks.

Materials horizons·2026
Same author

Optical color structuring via DALP-fabricated thin-film interference cavities in ZnO/SiO<sub>2</sub> on Si.

Optics express·2026
Same author

Neutrophil-derived reactive oxygen species mediate doxorubicin-induced cardiotoxicity and skeletal myopathy.

American journal of physiology. Heart and circulatory physiology·2026
Same author

Numerical and experimental investigation of innovative thermoelectric heat pump wall systems for enhancing building energy efficiency.

Scientific reports·2025
Same author

Multi-head spatial atomic layer deposition: a robust approach for precise doping and nanolaminate fabrication in open-air environments.

Nanoscale·2025
Same journal

Active devices and systems for closed-loop neuromodulation.

Microsystems & nanoengineering·2026
Same journal

An automated, digital immunoassay on a microfluidic cartridge for on-demand cytokine profiling.

Microsystems & nanoengineering·2026
Same journal

An integrated framework TSV-INet for arbitrarily distributed TSV interposer wafer warpage simulation.

Microsystems & nanoengineering·2026
Same journal

Mechanistic insights into cellular deformation enable enhanced extensional-flow cytometry for label-free classification and sorting.

Microsystems & nanoengineering·2026
Same journal

AlGaN/GaN HEMT H₂ sensor with integrated Wheatstone bridge and on-chip microheater for 0.1-ppm detection.

Microsystems & nanoengineering·2026
Same journal

Fully flexible large-area MEMS-based triaxial force sensor compatible with flat panel display manufacturing.

Microsystems & nanoengineering·2026
查看所有相关文章

相关实验视频

Updated: Jun 2, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

8.9K

在NEMS产生的机电频率子中,NEMS产生了机电频率.

Sasan Rahmanian1, Hamza Mouharrar2, Rana Abdelrahman1

  • 1Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada.

Microsystems & nanoengineering
|January 15, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种使用微电机系统 (NEMS) 产生宽范围,低功率频率 (FC) 的新方法. 该技术提供了卓越的带宽,稳定性和相连贯性,为便携式频发电机铺平了道路.

更多相关视频

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.6K
Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

6.1K

相关实验视频

Last Updated: Jun 2, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

8.9K
Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.6K
Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

6.1K

科学领域:

  • 微型和纳米电机系统 (NEMS)
  • 光子学和光学科学是光学和光学科学.
  • 响应系统工程 响应系统工程

背景情况:

  • 频率 (FC) 对于精确的频率测量和信号生成至关重要.
  • 现有的FC发电方法往往需要复杂的设置和高功耗.
  • 需要紧,低功率和稳定的FC源.

研究的目的:

  • 介绍一种新的,低功耗的技术,用于产生广域频率.
  • 证明使用模态相互作用在静电NEMS中用于FC产生的可行性.
  • 为了比较不同模式交互的性能,用于FC发电.

主要方法:

  • 在静电NEMS中利用电气和机械共振器之间的模态相互作用.
  • 驱动一个电磁共振器在共振,匹配到机械共振器的共振的子倍数.
  • 在环境空气中操作NEMS设备,以实现简化架构.
  • 分析NEMS位移以确定FCs特征的等距离峰值.

主要成果:

  • 产生超过150个同等距离的峰值 (2:1模式交互) 和超过60个峰值 (1:1模式交互) 的FC.
  • 观察到的自由光谱范围 (FSR) 在两个相互作用情况下等于机械共振频率.
  • 与 1:1 相互作用相比,在 2:1 模式交互中证明了优越的带宽,稳定性和相连贯性.
  • 在生成多个FC和微调FSR方面展示了灵活性.

结论:

  • 拟议的基于NEMS的技术提供了一种简单,低功耗和有效的方法来产生频率.
  • 2:1模式交互在带宽,稳定性和相位连贯性方面提供了卓越的性能.
  • 该技术适合集成到便携式设备中,与小型化趋势保持一致.