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相关概念视频

Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

490
In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
490
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

1.3K
The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The...
1.3K
Types Of Transformers01:16

Types Of Transformers

1.4K
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
1.4K
Transformers01:26

Transformers

1.7K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.7K
The Ideal Transformer01:26

The Ideal Transformer

1.3K
In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's tangential...
1.3K
Instrument Transformers01:23

Instrument Transformers

416
Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...
416

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相关实验视频

Updated: Jan 7, 2026

Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels
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Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels

Published on: June 2, 2020

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用于基于变压器的域调整的令牌校准.

Xiaowei Fu, Shiyu Ye, Chenxu Zhang

    IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
    |January 1, 2026
    PubMed
    概括
    此摘要是机器生成的。

    本研究引入了补丁适应变压器 (PATrans),通过解决视觉变压器中误导性的补丁相似性来改善无监督域适应 (UDA). PATrans提高了域调整,并在基准数据集上实现了最先进的结果.

    相关实验视频

    Last Updated: Jan 7, 2026

    Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels
    10:00

    Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels

    Published on: June 2, 2020

    22.4K

    科学领域:

    • 计算机视觉 计算机视觉
    • 机器学习 机器学习
    • 人工智能的人工智能

    背景情况:

    • 无监督域调整 (UDA) 将知识从标记的源转移到未标记的目标域.
    • 视觉变压器 (ViTs) 为UDA提供细粒度的补丁级表示,称为基于变压器的域调整 (TransDA).
    • 在TransDA中的域位移可能会导致误导性的补丁相似性,降低适应性能.

    研究的目的:

    • 提出一种新的方法,即补丁适应变压器 (PATrans),以应对TransDA中误导性的补丁相似性的挑战.
    • 识别和抑制相似异常补丁对域对齐的负面影响.
    • 使用ViT架构增强UDA的稳定性和性能.

    主要方法:

    • 引入了补丁适应注意力 (PAA) 机制,取代了标准的自我注意力.
    • PAA集成了一个重量共享的三分支混合注意力和一个补丁级域区分器用于令牌校准.
    • 实施了对比的注意力规范化策略,使用类别级信息来实现类别一致的注意力分布.

    主要成果:

    • PATrans有效地识别和减轻不可靠的补丁对应的影响.
    • 拟议的方法比现有的最先进的UDA方法取得了显著的改进.
    • 在四个基准数据集上表现强,在VisDA-2017上达到89.2%.

    结论:

    • 通过有效处理域名转移,PATrans为基于变压器的域名适应提供了强大的解决方案.
    • 新的注意力机制和规范化策略增强了特征学习和域调整.
    • 该方法为使用视觉转换器的无监督域调整设定了新的基准.