Acousto-electronics is an interdisciplinary field that combines principles of acoustics, electronics, and sometimes optics, to explore and utilize the interaction between acoustic waves and electronic devices. This area of study focuses on the generation, manipulation, and detection of acoustic waves (such as sound waves) and their effects on electronic systems. Key applications and concepts in acousto-electronics include: 1. **Acousto-optic Devices**: These devices use acoustic waves to modulate light.

Macrosonics is a term that refers to the use of very low-frequency sound waves, typically below the range of human hearing (20 Hz), for various applications. This technology is often explored in fields such as medicine, engineering, and environmental science. In medicine, macrosonics can be utilized for therapeutic purposes, such as in ultrasound treatments or non-invasive procedures that target tissues without causing damage. In engineering, it can be applied for material testing and analysis.

The noise floor refers to the level of background noise in a system or environment that can affect the performance and clarity of signals being processed or transmitted. It is an important concept in various fields, including telecommunications, audio engineering, and electronics. Here are some key points about the noise floor: 1. **Definition**: The noise floor is the measure of the sum of all unwanted signals (noise) within a given bandwidth, typically expressed in decibels (dB).

A radio noise source is a device or system designed to generate random electromagnetic noise across a certain frequency range, typically within the radio frequency (RF) spectrum. This noise can serve various purposes in telecommunications, electronics, and research. Here are some key points about radio noise sources: 1. **Types of Noise**: The noise created by such sources can include thermal noise, shot noise, and flicker noise, among others. Each type has unique characteristics and can be useful for different applications.

Time Gain Compensation (TGC) is a technique used primarily in radar and sonar systems, as well as in imaging and acoustic applications, to enhance the quality of the received signals. The purpose of TGC is to compensate for the loss of signal strength due to signal attenuation as the signal travels through a medium (like water or air) or as it propagates over distance.

Selectrix is a digital model railroad control system used primarily in model railroading, particularly in the DCC (Digital Command Control) context. It allows for the control and automation of model trains via digital signals, enabling more sophisticated operations compared to traditional analog methods. The system typically includes components such as: 1. **Command Station**: The central unit that sends signals to the locomotives and receives feedback from the layout.

"Nuclear topic book stubs" typically refers to brief or incomplete entries related to nuclear topics that are found on platforms such as Wikipedia. A "stub" is a term used in Wikipedia and other wikis to describe an article that is in its early stages and requires additional content for it to be fully informative or comprehensive.

Semiconductor journals are academic and professional publications that focus on research, development, and technology related to semiconductors. These journals typically cover a wide range of topics within the semiconductor field, including: 1. **Materials Science**: Research on semiconductor materials, including silicon, compound semiconductors (like gallium nitride and indium phosphide), and emerging materials (such as 2D materials like graphene).

A semilinear map is a type of function that appears in the context of vector spaces, particularly in linear algebra and functional analysis. It generalizes the notion of linear maps by allowing for a change of scalars through a field automorphism. Formally, let \( V \) and \( W \) be vector spaces over a field \( F \).

Blondel's experiments refer to a series of studies conducted by the French psychologist André Blondel in the early 20th century. His work primarily focused on the psychological phenomenon known as "attention," particularly in the context of perception and consciousness. One of Blondel's notable contributions was his investigation into the effects of divided attention and the limits of perceptual processing.

A separation barrier is a physical structure that is constructed to separate two areas, often for political, military, or social reasons. These barriers can take various forms, including walls, fences, or checkpoints, and are typically designed to restrict or control movement between different regions or groups of people. One of the most notable examples is the Israeli West Bank barrier, often referred to as the "Israeli separation wall" or "fence," which was constructed by Israel in the early 2000s.

In the context of mathematics, specifically in graph theory, a "separation number" typically refers to a concept related to graph connectivity and the robustness of network structures. However, the term can be used in different contexts, so its meaning may vary. 1. **Separation Number in Graph Theory**: This often refers to the minimum number of edges or vertices that need to be removed from a graph to disconnect it or to increase the number of connected components.

In topology, a **sequentially compact space** is a type of topological space that extends the concept of compactness in the context of sequences. A topological space \( X \) is said to be **sequentially compact** if every sequence of points in \( X \) has a subsequence that converges to a limit point in \( X \).