Audio feedback is a phenomenon that occurs when sound generated by a microphone or a similar audio input device is picked up again by the same device or by other nearby microphones, creating a loop of sound. This typically happens in live sound environments, such as concerts or public speaking events, where a microphone amplifies audio from a loudspeaker. When the amplified sound is captured again by the microphone, it results in a continuous loop, which can produce a high-pitched screech or howl.

Klaus Matthes may refer to multiple individuals, but there is no widely recognized or prominent figure by that name in public knowledge as of my last update in October 2023.

"Tube sound" refers to the characteristic audio quality produced by vacuum tube amplifiers, widely used in music production and amplification, particularly in electric guitars and high-fidelity audio systems. Tube amplifiers use vacuum tubes (also known as thermionic valves) to amplify audio signals, and they are known for creating a warm, rich, and pleasing sound.

Arrow types are a concept in programming, particularly in functional programming and type theory. They can be thought of as a way to generalize functions and represent computations. An arrow is often used to describe computations that have an input-output relation but can also include additional structure, such as the ability to combine or sequence computations.

A peristaltic pump is a type of positive displacement pump used to move fluids through a tube or hose. The pump operates by using a rotating mechanism, typically a series of rollers or shoes, that compresses a flexible tube or hose. As the rollers rotate, they create a series of waves that push the fluid through the tube in a manner similar to how food moves through the digestive tract via peristalsis.

Effect size is a quantitative measure that describes the strength or magnitude of a phenomenon, typically the difference or relationship between groups or variables in a study. It provides a way to assess the practical significance of research findings, going beyond just statistical significance (e.g., p-values). There are several types of effect sizes, including: 1. **Cohen's d**: Used to measure the standardized difference between two means.

Physical quantities are properties or attributes of physical systems that can be measured and expressed numerically. They provide a way to quantify various aspects of the physical world, such as length, mass, time, temperature, and electric charge, among others. Physical quantities can be categorized into two main types: 1. **Scalar Quantities**: These are quantities that are described by a magnitude alone and do not have a direction. Examples include mass, temperature, speed, volume, and energy.

Quantum optics is a field of study that examines the interaction between light (photons) and matter at the quantum level. It combines principles from quantum mechanics and optics to explore phenomena that cannot be explained by classical physics alone. This field investigates how light behaves as both a wave and a particle, leading to various quantum phenomena such as quantum entanglement, superposition, and quantum states of light.

Cobalt therapy, also known as cobalt-60 therapy, is a form of radiation treatment that uses cobalt-60, a radioactive isotope of cobalt, to treat cancer and certain other medical conditions. It was one of the early methods developed for radiation therapy in the mid-20th century and has been largely replaced by more advanced technologies, but it is important in the history of radiation oncology.

Sheldon Wolff is not a widely recognized figure or term, so it's possible you may be referring to a specific individual or context that isn't broadly known or might be misspelled. If you're referring to a notable person, could you please provide more context or clarify whether it's related to a specific field, like science, entertainment, or another area? That would help me provide a more accurate response.

The 113th meridian east is a line of longitude that is 113 degrees east of the Prime Meridian, which is located at 0 degrees longitude. It runs from the North Pole to the South Pole. The 113th meridian east passes through several regions, including parts of Russia, Mongolia, China, and Australia. In Australia, it crosses through states like Queensland and the Northern Territory.

The 179th meridian west is a line of longitude that is located 179 degrees west of the Prime Meridian, which is defined as 0 degrees longitude. It is one of the meridians in the geographic coordinate system and is part of the International Date Line (IDL). The 179th meridian west closely follows the 180th meridian but deviates slightly in places to accommodate political and geographic considerations.

John Hellins does not appear to be a widely recognized figure or concept based on the information available up to October 2023.

Density Functional Theory (DFT) is a quantum mechanical modeling method used to investigate the electronic structure of many-body systems, particularly atoms, molecules, and the condensed phases of matter. Instead of focusing on the wave functions of electrons, DFT simplifies the problem by using the electron density as the primary variable. ### Key Concepts: 1. **Electron Density**: In DFT, the properties of a system are derived from the electron density, which is a function of position in space.