61,984 articles
Riki Kobayashi
Riki Kobayashi was an American chemical engineer and Louis Calder Professor at Rice University from 1951, whose natural gas measurements became industry standards and earned him National Academy of Engineering election in 1995.
Rill (software)
Rill (rilldata/rill) is an open-source Apache-2.0 BI-as-code tool by Rill Data with DuckDB embedded by default, live OLAP connectors, Explore and Canvas dashboards, Rill Cloud, and MCP-based AI agent integration.
Rim (firearms)
In firearms, the rim is the flanged lip at the base of a cartridge case that the extractor grips to pull the spent case from the chamber.
Rim brake
A rim brake is a bicycle braking system in which pads press directly against the wheel rim, the dominant brake for most of the 20th century.
RIM-116 Rolling Airframe Missile
The RIM-116 Rolling Airframe Missile (RAM) is a fire-and-forget surface-to-air missile developed by the United States and Germany for ship defense against anti-ship cruise missiles.
RIM-8 Talos
The RIM-8 Talos was a long-range, ramjet-powered surface-to-air missile developed for the US Navy, serving aboard cruisers from 1958 until 1979, developed under Project Bumblebee.
Rimac Automobili
Rimac Automobili is a Croatian manufacturer of electric hypercars and automotive technology, founded by Mate Rimac in 2009, which merged its car business with Bugatti in 2021.
Rimac Concept One
The Rimac Concept One, also called the Concept 1, is a Croatian all-electric hypercar with four motors, one per wheel, built in eight units from 2016.
Rimac Nevera
The Rimac Nevera, formerly the Rimac C Two, is an all-electric two-seat hypercar built in Croatia by Rimac Automobili, unveiled in 2021 with 1914 hp and a 258 mph top speed.
RIMFAX
RIMFAX (Radar Imager for Mars' Subsurface Experiment) is a ground-penetrating radar on NASA's Perseverance rover, developed in Norway, that images rock layers beneath Jezero crater to depths over 30 meters.
Rimfire ammunition
Rimfire ammunition is a metallic cartridge whose priming compound sits in the hollow rim, struck by the firing pin on the rim's edge, mostly in .22 caliber.
Rimless wheel
A rimless wheel is a wheel with a hub and rigid spokes but no rim, stepping spoke to spoke and serving as the simplest model of legged walking, introduced by Tad McGeer in 1990.
Rimowa
Rimowa is a German luxury luggage manufacturer founded in Cologne in 1898 by Paul Morszeck, best known for its grooved aluminum suitcases and majority ownership by LVMH since 2017.
RINA
RINA, formerly Registro Italiano Navale, is a multinational ship classification, inspection, and certification company headquartered in Genoa, Italy. Founded in 1861, it is one of twelve members of the International Association of Classification Societies.
Ring (company)
Ring is an American home security company owned by Amazon, known for the Ring Video Doorbell. Founded by Jamie Siminoff as DoorBot, it was acquired by Amazon in 2018.
Ring Alarm
Ring Alarm is a do-it-yourself wireless home security system sold by Ring, an Amazon company, announced in 2018 at $199 with optional 24/7 professional monitoring.
Ring all-reduce
Ring all-reduce is a collective communication algorithm in which devices in a logical ring combine arrays, such as deep learning gradients, with data per device independent of device count.
Ring Attention
Ring Attention is a distributed-computing method introduced in October 2023 by Hao Liu, Matei Zaharia, and Pieter Abbeel that shards transformer attention across devices arranged in a ring.
Ring barrier controller
A ring barrier controller is a traffic signal controller, standard in United States practice, that organizes phases into rings meeting at barriers so conflicting movements never run simultaneously.
Ring circuit
A ring circuit, formally a ring final circuit, is a looped electrical circuit feeding each socket from two directions, standard in UK homes since 1950.
Ring Energy
Ring Energy, Inc. is an American oil and gas exploration and production company developing conventional Permian Basin assets in West Texas and Southeast New Mexico.
Ring gyroscope
A ring gyroscope is a Coriolis vibratory gyroscope that senses rotation with a ring-shaped resonator, first micromachined by Putty and Najafi in 1994 and now manufactured by Silicon Sensing Systems.
Ring main unit
A ring main unit (RMU) is a compact, factory-assembled switchgear unit used at load points of a ring distribution network, typically rated 11 to 24 kV.
Ring modulator
A ring modulator, also called a lattice modulator or double-balanced mixer, is a frequency-mixing circuit named for its ring of four diodes, producing sum- and difference-frequency outputs.
Ring network
A ring network is a network topology in which each node connects to two adjacent nodes in a closed loop, often using token passing to control transmission.
Ring oscillator
A ring oscillator is a digital circuit of an odd number of inverters in a loop that oscillates, used as a clock generator and chip speed probe.
Ring rolling
Ring rolling is a metal forming process that expands a pierced, doughnut-shaped blank between rolls, increasing diameter while reducing wall thickness to produce seamless rings.
Ring signature
A ring signature is a digital signature scheme letting a signer prove that some member of an ad hoc group signed a message without revealing which member it was.
Ring size
A ring size is a standardized designation of a ring's inner dimensions, defined by ISO 8653 as the circumference of the largest cylinder that fits inside the ring.
Ring Video Doorbell
The Ring Video Doorbell is a smart doorbell with a camera that streams live video and alerts to a phone, created by Jamie Siminoff in 2012.