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相关概念视频

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
Transformers in Distribution System01:27

Transformers in Distribution System

494
Transformers in distribution systems can be broadly categorized into distribution substation transformers and other distribution transformers. They are crucial for stepping down high transmission voltages to levels suitable for distribution and end-user applications.
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
494
Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

517
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...
517
The Ideal Transformer01:26

The Ideal Transformer

1.4K
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...
1.4K
Energy Losses in Transformers01:21

Energy Losses in Transformers

1.3K
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
1.3K

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相关实验视频

Updated: Jan 15, 2026

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images
04:23

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

Published on: April 21, 2023

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用变压器检测物体:一篇评论

Tahira Shehzadi1,2,3, Khurram Azeem Hashmi1,2,3, Marcus Liwicki4

  • 1Department of Computer Science, Technical University of Kaiserslautern, 67663 Kaiserslautern, Germany.

Sensors (Basel, Switzerland)
|October 16, 2025
PubMed
概括
此摘要是机器生成的。

检测变压器 (DETR) 利用变压器模型用于计算机视觉,通过将其视为集预测问题来改善对象检测. 本次审查涵盖了25项增强DETR技术的进展.

关键词:
这就是DETR.计算机视觉 计算机视觉深度神经网络是一个神经网络.对象检测检测对象检测对象检测变压器变压器变压器变压器

相关实验视频

Last Updated: Jan 15, 2026

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images
04:23

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

Published on: April 21, 2023

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科学领域:

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

背景情况:

  • 变压器已经彻底改变了自然语言处理 (NLP).
  • 检测变压器 (DETR) 将变压器应用于对象检测,将其作为一个集预测问题.
  • 最初的DETR版本面临着缓慢的融合和检测小物体的挑战.

研究的目的:

  • 为25个检测变压器 (DETR) 的最新进展提供全面的回顾.
  • 分析基础的DETR模块和最近的改进.
  • 鼓励进一步研究基于变压器的物体检测.

主要方法:

  • 对25个最近的DETR进步进行了回顾.
  • 对骨干结构,查询设计和注意力机制的修改进行分析.
  • 对各种检测变压器的性能和架构进行比较分析.

主要成果:

  • 许多改进已经解决了DETR最初的局限性,从而实现了最先进的性能.
  • DETR的进步包括骨干修改,精细的查询策略和改进的注意力机制.
  • 对比分析突出了各种DETR模型的性能和架构差异.

结论:

  • DETR已经显著发展,克服了最初的性能障碍.
  • 本综述提供了对DETR的进展和挑战的结构化概述.
  • 确定了未来的研究方向,以进一步推进物体检测中的变压器应用.