Физика электромагнетизма и сигналов

Уровень 0 · материалов: 4

В кластер входят документы, описывающие физические механизмы электромагнитных явлений и теорию сигналов, но не входят рекомендации по учебным видеоматериалам.

Общие признаки: электромагнитные поля, распространение волн, спектральный анализ, физика электрического тока

Группа выше: Оптика и электромагнетизм

Материалы

• #19324 — Solving the Mystery of Flicker Noise — Представитель этого кластера

  Загадка фликкер-шума разгадана — TVS

  Смысл: The main idea is that flicker noise is not a physical anomaly but a result of using the wrong spectral coordinate; it is the only signal that possesses a uniform spectrum when viewed through both frequency and period perspectives.

  Flicker noise is explained as a signal with a naturally uniform spectrum that appears as 1/f noise due to the mathematical properties of the Fourier transform.

• #26118 — Fourier Transform and Radiation Spectrum Relationship

  Преобразование Фурье и спектр излучения — одно и то же? — ALT0105

  Смысл: The text is an inquiry about whether the spectral broadening observed during the switching on/off of a signal represents real physical radiation (harmonics) or is simply a mathematical result of the Fourier transform applied to a finite time window.

  A non-specialist asks if the sidebands appearing in spectrum analyzer readings during signal termination are real physical emissions or artifacts of the measurement window.

• #19410 — Fundamentals of Electromagnetism and Wave Phase

  Электромагнетизм для самых маленьких, и не только — mkovalevich

  Смысл: The main idea is to explain the cyclic nature of electromagnetic waves through the lens of differential equations and to correct a perceived common error regarding the phase relationship between electric and magnetic fields in wave propagation.

  The author uses the mathematics of circles and the concept of the 'rotor' to argue that electric and magnetic fields in an electromagnetic wave must have a phase shift, contrary to some popular diagrams.

• #10458 — Mechanisms of Electric Current and Charge Movement

  Что на самом деле толкает заряд по проводу и создаёт ток? — uzumeti

  Смысл: The main idea is that electric current is not a flow of material particles like water in a pipe, but a process of energy transmission mediated by the interaction between the electromagnetic field and the electron field via photons.

  Electric current is the transmission of energy through the electromagnetic field interacting with electron-field quanta (electrons) via photons, rather than a simple flow of particles through a wire.