相关概念视频
01:22Magnetic Force On Current-Carrying Wires: Example
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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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01:28Magnetic Field Due To A Thin Straight Wire
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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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01:18Magnetic Field Due to Two Straight Wires
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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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01:12Mesh Analysis for AC Circuits
366
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
366
01:10Mesh Analysis with Current Sources
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Mesh analysis becomes simpler when analyzing circuits with current sources, whether independent or dependent. The presence of current sources reduces the number of equations required for analysis. Two cases illustrate this:
Current Source in One Mesh: The analysis process is straightforward when a current source is found in only one mesh within the circuit. Mesh currents are assigned as usual, with the mesh containing the current source excluded from the analysis. Kirchhoff's voltage law...
Current Source in One Mesh: The analysis process is straightforward when a current source is found in only one mesh within the circuit. Mesh currents are assigned as usual, with the mesh containing the current source excluded from the analysis. Kirchhoff's voltage law...
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01:14Design Example: Frog Muscle Response
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A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
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通过电阻电线网的损失诱导的模式选择.
Svetlana Kuznetsova1, Yves Aurégan1, Vincent Pagneux1
1Laboratoire d'Acoustique de l'Université du Mans (LAUM), UMR 6613, Institut d'Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, Avenue O. Messiaen, 72085 Le Mans Cedex 9, France.
The Journal of the Acoustical Society of America
|July 12, 2024
概括
电阻电网可以选择性地吸收或忽略声腔模式,作为过器. 这项研究确定了新的本地化模式,并突出了线网作为非赫米特物理学的多功能损失元表面.
科学领域:
- 声学 声学 在声学方面
- 超材料是指一种超材料.
- 非赫米特物理学 非赫米特物理学
背景情况:
- 声腔支持各种模式.
- 对应用程序来说,控制这些模式至关重要.
- 局部损失可以影响模式行为.
研究的目的:
- 为了研究电阻电网对声腔模式的影响.
- 探索选择性模式操纵和过.
- 识别新型模式并了解线网属性.
主要方法:
- 一维和二维声学腔模拟.
- 模式特有频率和定位的分析.
- 检查电线网的性能,如电阻和倾斜.
主要成果:
- 电线网可以选择性地控制声模式 (不受影响到完全吸收).
- 线网倾斜影响二维空洞中的更高阶模式.
- 发现了一种在线网上局部化的新类型的模式,具有虚构的固有频率.
结论:
- 电线网的功能是超宽带丢失的元表面.
