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Reactor protection system
A reactor protection system (RPS) is the instrumentation and control system of a nuclear reactor that automatically initiates a rapid shutdown, or scram, when monitored parameters indicate unsafe operating conditions.
Reactor-grade plutonium
Reactor-grade plutonium is plutonium recovered from nuclear fuel irradiated in a power reactor under normal conditions, containing about 24% Pu-240 versus 6% in weapons-grade material.
ReactOS
ReactOS is a free, open-source operating system written from scratch to run Windows applications and drivers. It began in 1996 as FreeWin95 and remains alpha software.
Read disturb
Read disturb is a reliability phenomenon in NAND flash memory in which repeated reads weakly program unread cells, shifting their voltages and causing bit errors.
Read-only memory
Read-only memory (ROM), also called read-only storage, is non-volatile semiconductor storage retaining data without power; its types include mask ROM, PROM, EPROM, EEPROM, and flash memory.
Read–eval–print loop
A read–eval–print loop (REPL) is an interactive programming environment that repeatedly reads a user's expression, evaluates it in the running program, and prints the result.
Readers–writers problem
The readers–writers problem is a classical concurrency problem, posed in 1971 by Courtois, Heymans, and Parnas, in which readers share a resource while writers need exclusive access.
Readings in Database Systems
Readings in Database Systems, the "Red Book," is an edited anthology of classic database research papers in five editions (1988-2015), edited by Stonebraker, Hellerstein, and later Bailis, used in graduate database courses.
README
A README is a text file at the top of a software project that explains what the project does, how to install and use it, and how to contribute.
Ready-mix concrete
Ready-mix concrete, or ready mix, is concrete batched at a central plant to an engineered mix design and delivered to the construction site freshly mixed and unhardened, usually in a revolving-drum transit mixer.
ReadyBoost
ReadyBoost, also known as Windows ReadyBoost, is a Windows feature, introduced with Vista in 2007, that uses flash memory on a USB drive or SD card as a read cache.
Reaktor (software)
Reaktor is a graphical modular software music studio by German company Native Instruments, begun as GENERATOR in 1996, where musicians build instruments, samplers, and effects from modules into ensembles.
Real Casa de los Expósitos
The Real Casa de los Expósitos, known as la Inclusa, was Madrid's royal foundling hospital, originating in a 1567 hospital and taking in abandoned children from 1572.
Real contact area
The real contact area is the sum of the microscopic spots where two rough surfaces actually touch, and it controls friction, wear, adhesion, and electrical contact resistance.
Real Driving Emissions
Real Driving Emissions is a European Union type-approval test that measures light-duty vehicle pollutant emissions on the road with onboard PEMS, compulsory for new car approvals since 2017.
Real ID Act
The Real ID Act is a 2005 US federal law setting minimum security standards for state driver's licenses and IDs accepted for federal purposes, such as boarding aircraft.
Real-ESRGAN
Real-ESRGAN is an open-source image and video restoration model that extends ESRGAN to real photographs, created by Xintao Wang and colleagues at Tencent ARC Lab in 2021.
Real-time analytics
Real-time analytics analyzes data as it arrives, in milliseconds to seconds, via event streams, Kafka-style ingestion, streaming or OLAP platforms, unlike batch analytics, supporting fraud detection and AI.
Real-time computing
Real-time computing, also called real-time processing, is computing whose correctness depends on results arriving on time, not just on their accuracy; late results count as system failure in hard real-time applications like flight control.
Real-time control of tearing modes
Real-time control of tearing modes is the set of tokamak techniques that detect and suppress tearing modes, magnetic instabilities, chiefly with steerable electron cyclotron current drive.
Real-time decoding of surface codes
Real-time decoding of surface codes means computing error-correction decisions from syndrome measurements fast enough to keep pace with a quantum processor's microsecond error-correction cycle, typically using FPGAs.
Real-time gross settlement
Real-time gross settlement (RTGS) is a funds transfer system in which interbank payments are settled individually and continuously in central bank money, giving immediate finality without netting.
Real-time hybrid simulation
Real-time hybrid simulation (RTHS) is a structural testing method that couples a physical laboratory specimen with a computer-simulated substructure, exchanging forces and displacements each time step to evaluate seismic response at lower cost than shake-table testing.
Real-time iteration scheme
The real-time iteration (RTI) scheme is an online algorithm for nonlinear model predictive control that performs one optimization iteration per sampling instant, introduced by Moritz Diehl and colleagues around 2001.
Real-time kinematic positioning
Real-time kinematic positioning (RTK) is a satellite-navigation surveying technique in which a base station sends corrections to a moving receiver, giving centimeter accuracy in real time.
Real-Time Messaging Protocol
The Real-Time Messaging Protocol (RTMP) is an application-level protocol created by Macromedia and later owned by Adobe for carrying audio, video, and data over TCP, still the standard ingest protocol for live streaming platforms.
Real-time operating system
A real-time operating system (RTOS) is an operating system designed so that both results and their timing are deterministic, providing preemptive scheduling, bounded interrupt latency, and high-resolution timers.
Real-time optimization
Real-time optimization (RTO) is a model-based method that repeatedly re-solves a plant's steady-state economic optimization using current measurements, sending optimal setpoints to lower control layers.
Real-time simulation
Real-time simulation is a computational method that produces one second of simulated results in one second of wall-clock time, used to train operators, test controllers, and validate digital twins.
Real-Time Streaming Protocol
The Real-Time Streaming Protocol (RTSP) is an application-layer protocol that controls streaming audio and video, letting clients play, pause, and stop media while delivery flows separately over RTP.