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Concentric Data Systems, Inc. was founded in December 1979 by John J. Henderson and Jonathan Sachs, both having left their jobs as system programmers
Concentric_Data_Systems
American software engineer
several years, where he wrote the STOIC language, at Data General, and at Concentric Data Systems. 1-2-3 was known for its speed and efficiency. The original
Jonathan_Sachs
Topics referred to by the same term
Concentric (album), a 2010 album by Jennifer Gentle Concentric Circles (Chris Potter album) Concentric Circles (Kenny Barron album) Concentric Data Systems
Concentric_(disambiguation)
Spreadsheet software
Sachs, who had written two spreadsheet programs while working at Concentric Data Systems, Inc. "1-2-3" symbolizes the software's three modules: spreadsheet
Lotus_1-2-3
Interrelated entities that form a whole
expressed in its functioning. Systems are the subjects of study of systems theory and other systems sciences. Systems have several common properties
System
Car component
purpose but which use spring-loaded brushes contacting concentric slip rings. In vehicle steering systems, a clockspring is a spiral-wound special rotary electrical
Clockspring
Meteorological process around and within the eye of intense tropical cyclones
In meteorology, an eyewall replacement cycle, also called a concentric eyewall cycle, is a process whereby some of the outer rainbands of a tropical cyclone
Eyewall_replacement_cycle
Software design pattern
component, which are presented as concentric rings. It isolates adapters and interfaces (user interface, databases, external systems, devices) in the outer rings
Hexagonal architecture (software)
Hexagonal_architecture_(software)
British carburettor manufacturing company
chamber, the Monobloc with an integral but offset float chamber and the Concentric, a later development with the float chamber directly below the body and
Amal_(carburettor)
IBM computer family (1964–1977)
The IBM System/360 (S/360) is a family of computer systems announced by IBM on April 7, 1964, and delivered between 1965 and 1978. System/360 was the
IBM_System/360
Medical condition
Baló's concentric sclerosis is a disease in which the white matter of the brain appears damaged in concentric layers, leaving the axis cylinder intact
Baló_concentric_sclerosis
Color space
Coloroid HSL and HSV Natural Color System There are mathematical issues with this depiction: If one calls the concentric rings "chroma" and the horizontal
Munsell_color_system
Optical machine-readable representation of data
systems have made inroads in the AIDC market, but the simplicity, universality and low cost of barcodes has limited the role of these other systems,
Barcode
File format for 3D printing and scanning
stereolithography CAD software created by 3D Systems. Chuck Hull, the inventor of stereolithography and 3D Systems’ founder, reports that the file extension
STL_(file_format)
Electronic non-volatile computer storage device
Embedded Flash Memory for Embedded Systems: Technology, Design for Sub-systems, and Innovations. Integrated Circuits and Systems. Springer Publishing. pp. 209–244
Flash_memory
Patterns formed by streams, rivers, and lakes in a drainage system
In geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin
Drainage system (geomorphology)
Drainage_system_(geomorphology)
Cosmological model
the detection of the concentric anomalies was not statistically significant, in that no more concentric circles appeared in the data than in Lambda-CDM
Conformal_cyclic_cosmology
Line of 35mm SLR cameras, lenses, and accessories
body concentric with the lens mount. OM lenses also featured a depth-of-field preview button on the lens, in contrast to most other SLR camera systems, in
Olympus_OM_system
US software development company
Concentric Sky is a software development company located in Eugene, Oregon. The company was founded in 2005 by Wayne Skipper, and grew to nearly 90 employees
Concentric_Sky
LAN-based email system
discontinued store-and-forward LAN-based email system originally developed for MS-DOS by Concentric Systems in the 1980s. The company, founded by Robert
Cc:Mail
Removable disk storage medium
to properly read and write data. The tracks are concentric rings around the center, with spaces between tracks where no data is written; gaps with padding
Floppy_disk
where the data will be read or written. The data on the media is stored in sectors which are arranged in parallel circular tracks (concentric or spiral
Hard disk drive performance characteristics
Hard_disk_drive_performance_characteristics
Measures to combat enemy aerial forces
subsurface (submarine-launched), and air-based weapon systems, in addition to associated sensor systems, command and control arrangements, and passive measures
Anti-aircraft_warfare
Electro-mechanical data storage device
logical damage to file systems, a variety of tools, including fsck on UNIX-like systems and CHKDSK on Windows, can be used for data recovery. Recovery from
Hard_disk_drive
Infrastructure that conveys sewage or surface runoff using sewers
increasingly complex networked sewer systems, some of which are still in use. It was after the construction of the sewer systems that people realized the reduction
Sewerage
Type of two-dimensional barcode
using UPC barcodes to systems using QR codes. The only context in which common QR codes can carry executable data is the URL data type. These URLs may
QR_code
Detection of leaks in pipelines
related data to the pipeline controllers to assist decision-making. Pipeline leak detection systems can also enhance productivity and system reliability
Leak_detection
star systems within 25–30 light-years List of star systems within 30–35 light-years List of star systems within 35–40 light-years List of star systems within
List_of_nearest_stars
Seabed feature of the North Sea
Allen. Analyzing seismic data for a region 130 km (81 mi) off the Humber estuary, Allen noticed an unusual set of concentric rings. Thinking they resembled
Silverpit_crater
Fare zone system managed by Transport for London
Fare zone 1 covers the central area and fare zones 2, 3, 4, 5 and 6 form concentric rings around it. Some National Rail stations and almost all Transport
London_fare_zones
1960s NASA program which developed and tested nuclear reactors for satellites
North American Aviation. Their systems were given even-numbered SNAP designations, the first being SNAP-2. Most of the systems development and reactor testing
Systems for Nuclear Auxiliary Power
Systems_for_Nuclear_Auxiliary_Power
Type of chart
though concentric circles help as grid lines. Instead, one may use a simple line graph, particularly for a time series. Radar charts can distort data to some
Radar_chart
Electromechanical device
signals including data such as those found on aerodrome beacons, rotating tanks, power shovels, radio telescopes, telemetry systems, heliostats or ferris
Slip_ring
Defunct US-based electronics company (2001–2018)
Commercial Systems (CS) Government Systems (GS) International and Service Solutions (I&SS) Information Management Services (IMS) Interior Systems (IS) The
Rockwell_Collins
Health information system
The Veterans Health Information Systems and Technology Architecture (VistA) is the system of record for the clinical, administrative and financial operations
VistA
System for defining and representing engineering tolerances
and Tolerancing Standard. ISO 10303 Industrial automation systems and integration – Product data representation and exchange ISO 10303-47 Integrated generic
Geometric dimensioning and tolerancing
Geometric_dimensioning_and_tolerancing
Scanning of an object or environment to collect data on its shape
the Trimble VX) cost around €75,000. Terrestrial lidar systems cost around €300,000. Systems using regular still cameras mounted on RC helicopters (Photogrammetry)
3D_scanning
Type of cabling using shielded pairs of conductors
used with IBM's System/34, System/36, System/38, and IBM AS/400 midrange hosts, and with IBM Power Systems machines running IBM i. The data transmission
Twinaxial_cabling
Techniques to study geometric data
handle geographic data means that spatial analysis is occurring within increasingly data-rich environments. Geographic data capture systems include remotely
Spatial_analysis
Class of guided missile destroyers in the Chinese People's Liberation Army Navy
surface combatant to use canister-based universal VLS, as opposed to the concentric type VLS carried aboard earlier vessels. 64 cells are carried, 32 forward
Type_052D_destroyer
Natural satellites of the planet Saturn
hemisphere and a vast canyon system named Ithaca Chasma extending at least 270° around Tethys. The Ithaca Chasma is concentric with Odysseus, and these two
Moons_of_Saturn
Operating system for Tandy TRS-80 computers
Model 4 1984 – Logical Systems publishes The Source, the commented assembler source code to TRSDOS 6.2 Late 1986 – Logical Systems releases LS-DOS 6.3,
TRSDOS
Pattern of symbols incorporated into a number of banknote designs
circles formed the innermost circles in a background pattern of fine concentric circles. On the front of former Bank of England Elgar £20 notes, they
EURion_constellation
Messages to deter human intrusion at nuclear waste repositories in the far future
installation of warning signs in the most important global languages in a concentric pattern around any terminal storage location. As time passed, further
Long-term nuclear waste warning messages
Long-term_nuclear_waste_warning_messages
Military aircraft radar warning receiver
stand-alone system, the ALR-67 integrates and coordinates its operation with onboard fire-control radars, data links, jammers, missile detection systems. In the
AN/ALR-67 radar warning receiver
AN/ALR-67_radar_warning_receiver
Sector of a disk storage unit which is unreadable
the operating system like Windows or Linux will skip it in the future. Bad sectors are a threat to information security in the sense of data remanence. Bad
Bad_sector
General category of storage mechanisms
devices focused on holding computer data, e.g., HDDs, FDDs, and Iomega zip drives, use concentric tracks to store data. During a sequential read or write
Disk_storage
Converts an electrical audio signal into a corresponding sound
speakers), headphones, and earphones. Larger, louder speaker systems are used for home hi-fi systems (stereos), electronic musical instruments, sound reinforcement
Loudspeaker
Metal rod intended to protect a structure from a lightning strike
potential strikes. Lightning protection systems prevent lightning strike damage to structures. Lightning protection systems mitigate the fire hazard that lightning
Lightning_rod
Large multi-ring impact crater on Jupiter's moon Callisto
which can be inferred from magnetometric data. The formation of a ringed structure is caused by the concentric failure of the brittle outer shell (lithosphere)
Valhalla_(crater)
Point of reference against which some others are calculated
defined and measured. This matters because the hub and rim need to be concentric to within close limits (or else the wheel will not roll smoothly). The
Datum_reference
Radar sweep display
the display, with the distance from it and height above ground drawn as concentric circles. As the radar antenna rotates, a radial trace on the PPI sweeps
Plan_position_indicator
US military computer network standard
Avionic Systems Standardisation Committee, Avionic Data Transmission Interface Systems Part 2 : Serial, Time Division Command/Response Multiplex Data Bus
MIL-STD-1553
Graphic tool used by meteorologists
frequency that the wind blows from a particular direction per unit time. Each concentric circle represents a different frequency, emanating from zero at the center
Wind_rose
UNESCO World Heritage Site in Jaipur
systems: the horizon-zenith local system, the equatorial system, and the ecliptic system. The Kanmala Yantraprakara is one that works in two systems and
Jantar_Mantar,_Jaipur
Historical method for giving addresses to physical data blocks on hard disk drives
for giving addresses to each physical block of data on a hard disk drive. It is a 3D-coordinate system made out of a vertical coordinate head, a horizontal
Cylinder-head-sector
American medical technology company
surgical equipment, patient and caregiver safety technologies, endoscopy systems, and patient handling, emergency medical equipment, and intensive care
Stryker_Corporation
Ancient Greek concept
ISBN 3-540-96683-8. p. 4. Gurzadyan VG; Penrose R (2010-11-16). "Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity". arXiv:1011
Aeon
Tank gun
mechanism. The M68 differs from the L7 in several aspects : The M68 uses a concentric recoil spring instead of a separate buffer and recuperator hydraulic cylinders
M68_tank_gun
Fortified yard in a medieval castle
fortification technology employed, ranging from simple enclosures to elaborate concentric defences. In addition to the gradual evolution of more complex fortification
Bailey_(castle)
Chinese guided-missile stealth cruiser/destroyer class
The command-and-control and battle management systems are likely comparable to contemporary PLAN systems, which reflect over a decade of intensive interest
Type_055_destroyer
Former public transport ticketing system in Melbourne, Australia
cardboard and used a magnetic strip to store fare data. Metcard was operated by OneLink Transit Systems under a contract with the Government of Victoria
Metcard
Graphical disk usage analyzer software for KDE
columns-represent-directories view like xdiskusage, it shows a series of concentric pie charts representing the various directories within the requested partition
Filelight
Curved path of an object around a point
orbital dynamics of systems under the influence of gravity, including spacecraft and natural astronomical bodies such as star systems, planets, moons, and
Orbit
Electrical cable with concentric conductors
electrical cable consisting of an inner center conductor surrounded by a concentric conducting shield, with the two separated by a dielectric (insulating
Coaxial_cable
CERN LHC experiment
the ATLAS data acquisition systems rely on high-speed point-to-point links and switching networks. Even with advanced electronics for data reading and
ATLAS_experiment
Use of sunlight for water heating with a solar thermal collector
capita leaders in the use of solar water heating systems supporting 30%–40% of homes. Flat plate solar systems were perfected and used on a large scale in
Solar_water_heating
Energy storage technology company
stacking method actually envisioned for EV1 shows outside circular layers concentric to the inner one with roughly twice its diameter. This is built up to
Energy_Vault
Electronic musical instrument
triggers. For practical playing the pad surface is divided into multiple concentric trigger zones. The individual playing zones, underlying position rings
Mandala_Drum
length, i.e. no movement), isotonic concentric (muscle shortens as it contracts at a constant torque), isokinetic concentric (muscle shortens as it contracts
Muscle Atrophy Research and Exercise System
Muscle_Atrophy_Research_and_Exercise_System
High-density disk drive recording technology
storage capacity. Conventional hard disk drives record data by writing non-overlapping concentric magnetic tracks (conventional magnetic recording [CMR]
Shingled_magnetic_recording
each with two concentric valve springs, sliding-finger cam followers, timing belt-driven single overhead camshaft (SOHC) fuel system, aspiration 31 PIC
List of discontinued Volkswagen Group petrol engines
List_of_discontinued_Volkswagen_Group_petrol_engines
Class of molluscs
outer surface of the valves is often sculpted, with clams often having concentric striations, scallops having radial ribs and oysters a latticework of irregular
Bivalvia
Communications company
Tandy Corporation, Intel, Verio, Cable & Wireless, Frontier Corporation, Concentric Network, ICG Communications, Enron, Network Plus, and Netopia. The company
NorthPoint_Communications
Flat, usually circular disc that encodes binary data
players and similar devices that can read data discs. For cross-platform compatibility, multiple file systems can co-exist on one disc and reference the
Optical_disc
Fictional universe created by Iain M. Banks
Culture. Ship Mind classes include General Systems Vehicle (GSV), Medium Systems Vehicle (MSV), Limited Systems Vehicle (LSV), General Contact Vehicle (GCV)
The_Culture
Water supplied through a pipe and tap combination
individuals, usually via a system of pumps and pipes. Public water supply systems are crucial to properly functioning societies. These systems are what supply drinking
Tap_water
Class of mollusks
Leo S. (1992). "Chromatophore Systems in Teleosts and Cephalopods: A Levels Oriented Analysis of Convergent Systems". Brain, Behavior and Evolution
Cephalopod
Variable transformers used in control systems
the bridge. There are two types of synchro systems: torque systems and control systems. In a torque system, a synchro will provide a low-power mechanical
Synchro
Captured energy for later usage
hydrogen; however, systems to harness this option have not been commercially developed and are much more complex than electrolysis systems. Common methods
Energy_storage
Star system in the Centaurus constellation
Searching for Planets in Binary Star Systems". arXiv:2608.04250 [astro-ph.EP]. "Looking for Earth 2.0 in Binary Systems". Universe Today. August 2026. Quintana
Alpha_Centauri
– Automotive Technology – Diesel systems. Retrieved 4 November 2009. "Passenger-car systems – Unit Injector System (UIS)". Bosch.de. Robert Bosch GmbH
List of discontinued Volkswagen Group diesel engines
List_of_discontinued_Volkswagen_Group_diesel_engines
Writing paper with a grid
can be used for a normal probability plot. Polar coordinate paper has concentric circles divided into small arcs or 'pie wedges' to allow plotting in polar
Graph_paper
Analog multiplexing technique used in early telephone systems
and coaxial cable systems; it was later used in microwave transmission and submarine communications cable systems. Carrier systems grew steadily in capacity
Carrier_telephony
Landform where the floor of a crater is mostly covered by parallel ridges
A concentric crater fill (CCF) is a landform where the floor of a crater is mostly covered with many parallel ridges. It is common in the mid-latitudes
Concentric_crater_fill
Rapidly rotating storm system
weather systems is generally given to the Queensland Government Meteorologist Clement Wragge who named systems between 1887 and 1907. This system of naming
Tropical_cyclone
Disked object in the constellation Centaurus
depths of J1407b's eclipses indicate that its disk consists of various concentric rings and gaps of different opacities. A 2015 analysis of J1407b's eclipse
J1407b
broke apart to form the rest of the Universe. It resembled a system of hollow concentric wheels, filled with fire, with the rims pierced by holes. Consequently
Historical models of the Solar System
Historical_models_of_the_Solar_System
Fictional universe of a media franchise
diameter, comprising millions of habitable star systems. Its structure is divided into several concentric regions that determine levels of technological
Universe_of_Star_Wars
Device that cools air through the evaporation of water
extreme limitations of many electrical utility systems, M-Cycle units may be the only appropriate cooling systems suitable for impoverished areas during times
Evaporative_cooler
NOAA weather modification program
common in unseeded systems as well, such observations would throw doubt on the hypothesis and assumptions driving Project Stormfury. Data and observations
Project_Stormfury
Closed or semi-closed circuit scuba
used in life-support systems in submarines, submersibles, underwater and surface saturation habitats, and in gas reclaim systems used to recover the large
Diving_rebreather
Retrieved March 27, 2009. "BAE SYSTEMS COMPUTERS TO MANAGE DATA PROCESSING AND COMMAND FOR UPCOMING SATELLITE MISSIONS". BAE Systems. June 17, 2008. Retrieved
Comparison of embedded computer systems on board the Mars rovers
Comparison_of_embedded_computer_systems_on_board_the_Mars_rovers
command/control systems IEC TR 62291 Multimedia data storage – Application program interface for UDF based file systems IEC 62295 Multimedia systems – Common
List_of_IEC_standards
Russian circularly disposed antenna array in Kaliningrad enclave
the site. Work has progressed until in July 2025 the facility has six concentric antenna rings, a security perimeter fence with checkpoint and radial roads
Chernyakhovsk_CDAA
Public university in Sri Lanka
arms of the University of Kelaniya is circular and consists of three concentric bands, the outermost of which contains the name of the university in Sinhala
University_of_Kelaniya
Disk drive optimization method
(using zoned constant angular velocity). On a disk consisting of roughly concentric tracks, whether realized as separate circular tracks or as a single spiral
Zone_bit_recording
Soviet and Russian spacecraft navigation system
autonomous digital computerized systems. These systems consisted of gyro platform, digital computer and fly-by-wire systems. The first being the Gemini Guidance
Voskhod Spacecraft "Globus" IMP navigation instrument
Voskhod_Spacecraft_"Globus"_IMP_navigation_instrument
Eudoxus, Callippus, and Aristotle all developed models of the solar system based on concentric spheres. These required more than one sphere per planet in order
Discovery and exploration of the Solar System
Discovery_and_exploration_of_the_Solar_System
Operating modes for central processing unit
ring-based security, wherein the hierarchy of privileges resembles a set of concentric rings, with the kernel mode in the center. Multics hardware was the first
CPU_modes
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