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Compressive spectrum sensing
Compressive spectrum sensing is a technique for detecting occupied radio-frequency channels across a wide band by sampling below the Nyquist rate and reconstructing the sparse spectrum.
Compressor
A compressor is a machine that converts energy into the potential energy of gas pressure, with types including reciprocating, rotary screw, scroll, centrifugal, and axial, used in refrigeration and industry.
Compressor map
A compressor map, or compressor performance map, is a chart plotting total pressure ratio against corrected mass flow at constant corrected speeds, with adiabatic efficiency contours; it is standard for gas turbines and turbochargers.
Compressor stall
A compressor stall, also known as compressor surge, is a breakdown of airflow in a gas turbine engine's compressor that causes a loud bang and temporary loss of compression.
Compressor station
A compressor station is a facility along a natural gas pipeline that houses compressors boosting pressure lost to friction, placed every 40 to 100 miles to keep gas flowing.
CompTIA
CompTIA (the Computing Technology Industry Association) is an American organization founded in 1982 that offers vendor-neutral IT certifications such as A+, Network+, and Security+, with more than 3.5 million awarded.
Compton Gamma Ray Observatory
The Compton Gamma Ray Observatory (CGRO), also called Compton, was a NASA space observatory that studied the gamma-ray sky from 1991 to 2000 as the second of NASA's Great Observatories.
CompTox Chemicals Dashboard
The CompTox Chemicals Dashboard, also called the CompTox Chemistry Dashboard, is an EPA web application providing chemistry, toxicity, and exposure data on over 1.3 million chemicals.
CompuServe
CompuServe (CompuServe Information Services) is an American online service founded in 1969 in Columbus, Ohio, a leading consumer online service that introduced email, chat, and the GIF format.
Compustat
Compustat is a family of databases of standardized financial statements and market data for publicly traded companies, provided by S&P Global and covering over 80,000 firms.
Computar
Computar is a Japanese brand of industrial and surveillance camera lenses owned by the CBC Group, launched in 1981 and described as the world's largest CCTV lens producer.
Computational auditory scene analysis
Computational auditory scene analysis (CASA) is a signal processing approach that separates individual sound sources from audio mixtures, reproducing how human listeners organize sound into perceptual streams.
Computational complexity
Computational complexity is the branch of theoretical computer science that classifies problems by the resources, such as time and memory, needed to solve them, and centers on the unsolved P versus NP question.
Computational complexity of learning
The study of which concept classes can be learned by efficient algorithms rather than merely with enough data, including cryptographic lower bounds, NP-hardness of proper learning, and computational-statistical gaps.
Computational complexity of mathematical operations
The computational complexity of mathematical operations studies how the running time of algorithms for tasks like multiplying integers and matrices grows with input size, in bit and algebraic models.
Computational lithography
Computational lithography is the use of calibrated algorithmic models to simulate and optimize lithography imaging, deforming masks so printed chips match the intended circuit patterns.
Computational materials discovery
Computational materials discovery is the use of computer-based methods, chiefly quantum-mechanical calculations, machine learning, and self-driving laboratories, to predict and design new materials before synthesizing them.
Computational storage
Computational storage is an architecture, defined by SNIA, in which computation is coupled to storage to offload processing from the host or reduce data movement between storage and compute.
Computational thinking
Computational thinking, popularized by Jeannette Wing in 2006, is a problem-solving approach that formulates problems and solutions so an information-processing agent, human or machine, can execute them.
Compute Express Link
Compute Express Link (CXL) is an open interconnect standard, developed by the CXL Consortium and built on PCIe, that lets processors attach accelerators and memory coherently.
Compute offtake agreements
A compute offtake agreement is a multi-year contract in which a buyer commits to purchasing defined GPU computing capacity from a provider before the data center exists.
Compute shader
A compute shader is a programmable shader stage that runs general-purpose, data-parallel work on a GPU outside the graphics pipeline; Microsoft introduced it with Direct3D 11 as DirectCompute.
Compute-and-forward
Compute-and-forward is a wireless relaying strategy, proposed by Bobak Nazer and Michael Gastpar, in which relays decode integer combinations of transmitted messages rather than treating interference as noise.
Computed axial lithography
Computed axial lithography (CAL) is a volumetric 3D printing method, reported in 2019, that cures a whole object at once by projecting light patterns into rotating resin.
Computed torque control
Computed torque control, also called inverse dynamics control, is a model-based method for controlling robot manipulators. It computes joint torques from a dynamic model of the robot plus feedback on tracking error.
Computer
A computer, also called an electronic computing device, is a programmable machine combining hardware like a CPU and memory with software, spanning microcontrollers to supercomputers.
Computer (Perplexity)
Computer is a general-purpose agentic digital worker launched by Perplexity in February 2026, which coordinates multiple AI models to decompose a user's goal into tasks and deliver finished work.
Computer algebra system
A computer algebra system (CAS), also called a symbolic algebra system, is software that manipulates mathematical expressions exactly rather than as decimal approximations, performing differentiation, integration, and equation solving symbolically.
Computer architecture
Computer architecture, also known as computing architecture, is the design of computer systems' organization and behavior, spanning instruction set architecture and microarchitecture, from x86 and ARM processors to pipelining and memory hierarchies.
Computer architecture simulator
A computer architecture simulator is a software program that models a processor, memory hierarchy, or whole computer system, letting researchers evaluate hardware designs before building them.