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Ab initio quantum chemistry program
Dirac (named after Paul Dirac; own notation DIRAC) is a relativistic ab initio quantum chemistry program. The full name is Program for Atomic and Molecular
Dirac_(software)
British physicist (1902–1984)
Paul Adrien Maurice Dirac (/dɪ.ˈræk/, dih-RAK; 8 August 1902 – 20 October 1984) was a British theoretical physicist who is considered to be one of the
Paul_Dirac
Video compression format
Dirac (and Dirac Pro, a subset standardised as SMPTE VC-2) is an open and royalty-free video compression format, specification and software video codec
Dirac (video compression format)
Dirac_(video_compression_format)
Topics referred to by the same term
quantum physics. Dirac may also refer to: DiRAC, Distributed Research using Advanced Computing, a supercomputing facility Dirac (software), a relativistic
Dirac_(disambiguation)
Acoustics process
software. Notable examples are IMAX cinemas, which use Audyssey MultEQ XT32, while Datasat processors (found in all DTS:X rooms) have Dirac software.
Digital_room_correction
open-source software (FOSS) packages, computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition
List of free and open-source software packages
List_of_free_and_open-source_software_packages
GitLab. "DIRAC: Program for Atomic and Molecular Direct Iterative Relativistic All-electron Calculations". www.diracprogram.org. "Documentation Dirac". www
List of computational chemistry software
List_of_computational_chemistry_software
integral Dirac delta function Dirac comb Dirac measure Dirac operator Dirac algebra 5997 Dirac, an asteroid The various Dirac Medals Dirac (software) DiRAC supercomputing
List of things named after Paul Dirac
List_of_things_named_after_Paul_Dirac
Mathematical computing environment
r a c ( w − 1 ) ) {\displaystyle \mathrm {I} \pi \,(\mathrm {Dirac} (w+1)-\mathrm {Dirac} (w-1))} Find functions f that satisfy the integral equation
Maple_(software)
Open container format by Xiph.Org Foundation
2002). Dirac: a free and open video format developed by the BBC. Uses wavelet encoding. Lossless Dirac: a part of the specification of dirac covers lossless
Ogg
Output of a dynamic system when given a brief input
frequencies (see the Fourier transform of the Dirac delta function, showing infinite frequency bandwidth that the Dirac delta function has), the impulse response
Impulse_response
is the study of Dirac operators, and Dirac type operators in analysis and geometry, together with their applications. Examples of Dirac type operators
Clifford_analysis
Free and open-source software and server
VMP, is a free and open-source, portable, cross-platform media player software and streaming media server developed by the VideoLAN project. VLC is available
VLC_media_player
US-based software and services company
American publicly traded company that develops data integration and analytics software. Palantir is headquartered in Miami, Florida, and was founded in 2003 by
Palantir
implementation of the Theora format, based on VP3, part of the Ogg Project Dirac as dirac-research, a wavelet based codec created by the BBC Research, and Schrödinger
List_of_open-source_codecs
In mathematics, the incomplete Fermi-Dirac integral, named after Enrico Fermi and Paul Dirac, for an index j {\displaystyle j} and parameter b {\displaystyle
Incomplete Fermi–Dirac integral
Incomplete_Fermi–Dirac_integral
of video players compares general and technical information for notable software media player programs. For the purpose of this comparison, video players
Comparison of video player software
Comparison_of_video_player_software
Intrinsic quantum property of particles
the Dirac equation, rather than being a more nearly physical quantity, like orbital angular momentum L). Nevertheless, spin appears in the Dirac equation
Spin_(physics)
Multimedia framework
FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files
FFmpeg
Chemistry portal List of software for Monte Carlo molecular modeling List of computational physics software Comparison of software for molecular mechanics
List of quantum chemistry and solid-state physics software
List_of_quantum_chemistry_and_solid-state_physics_software
Non-mathematical introduction
notion of quantum view". In 1931, Dirac proposed the existence of particles that later became known as antimatter. Dirac shared the Nobel Prize in Physics
Introduction to quantum mechanics
Introduction_to_quantum_mechanics
Physical theory with fields invariant under the action of local "gauge" Lie groups
electron field. The bare-bones action that generates the electron field's Dirac equation is S = ∫ ψ ¯ ( i ℏ c γ μ ∂ μ − m c 2 ) ψ d 4 x {\displaystyle {\mathcal
Gauge_theory
Α video codec is software or a device that provides encoding and decoding for digital video, and which may or may not include the use of video compression
Comparison_of_video_codecs
Free lossy video compression format
theora. Free and open-source software portal AV1 (open and royalty-free video coding format) Comparison of video codecs Dirac (video compression format)
Theora
Methods of mathematical approximation
of quantum mechanics in 20th century atomic and subatomic physics. Paul Dirac developed quantum perturbation theory in 1927 to evaluate when a particle
Perturbation_theory
Algebra of 4D spacetime
A{\widetilde {J}}\rangle _{0\oplus 3}\,,} which is a real scalar invariant. The Dirac equation, for an electrically charged particle of mass m and charge e, takes
Algebra_of_physical_space
Chinese-American physicist (1963–2018)
received numerous international awards, including the Buckley Prize, the Dirac Medal and Prize, the Europhysics Prize, the Physics Frontiers Prize and
Shoucheng_Zhang
Molecular modeling software
Glide is a molecular modeling software for docking of small molecules into proteins and other biopolymers. It was developed by Schrödinger, Inc. Kirkpatrick
Glide_(docking)
Implementation of Microsoft Silverlight for Unix-based operating systems
allowed Moonlight to work with pluggable open codecs, such as Theora and Dirac. Preview releases of Moonlight 4.0, targeting Silverlight 4 compatibility
Moonlight_(runtime)
Setting of relativistic physics in geometric algebra
coordinate-free formulation for all of relativistic physics, including the Dirac equation, Maxwell equation and general relativity" and "reduces the mathematical
Spacetime_algebra
American defense manufacturing company
hardware production. Alongside Palantir, 8VC, General Catalyst, Oklo Inc., Dirac and Atomic Industries, Hadrian is a founding member of the New American
Hadrian_Automation
BLYP, B3LYP, EDF1, EDF2, M06, ωB97X-D Exchange functionals: HF, Slater-Dirac, Becke88, Gill96, GG99, B(EDF1), PW91 Correlation functionals: VWN, LYP
Spartan_(chemistry_software)
Image sharpening technique
is a simple linear image operation—a convolution by a kernel that is the Dirac delta minus a gaussian blur kernel. Deconvolution, on the other hand, is
Unsharp_masking
Theoretical physicist (1939–2023)
November 8, 1939 – June 14, 2023) was an American theoretical physicist and Dirac Medallist. Born in Lubliniec, Poland in 1939 to a Ukrainian family, the
Roman_Jackiw
Audio and video transcoder
various types into the free Ogg Vorbis audio format, and the Theora, VP8 and Dirac video formats. It supports Ogg, Matroska and WebM containers for output
OggConvert
Electron trajectories in electromagnetic fields
derive effects of magnetic structures to charged particles starting from the Dirac equation. As electrons can exhibit non-particle (wave-like) effects such
Electron_optics
Class of mathematical software
Tensor software is a class of mathematical software designed for manipulation and calculation with tensors. SPLATT is an open source software package for
Tensor_software
List of computer file compression formats
Media Video) FFmpeg (decoder only) NVDEC (for NVIDIA GPU) Dirac (SMPTE 2042-1) Schrödinger dirac-research FFmpeg (decoder only) Alliance for Open Media AV1
List_of_codecs
Scientific theory
exchange energy in orbital-free density functional theory (OFDFT) is the Dirac exchange as a Local Density Approximation (LDA) (1930) It is related to
Orbital-free density functional theory
Orbital-free_density_functional_theory
Sufficiency theorem for reconstructing signals from samples
mathematically equivalent method uses the Dirac comb and proceeds by convolving one sinc function with a series of Dirac delta pulses, weighted by the sample
Nyquist–Shannon sampling theorem
Nyquist–Shannon_sampling_theorem
Library of multimedia codecs
only) CineForm (decoding only) Cinepak Creative YUV (CYUV, decoding only) Dirac DNxHD Duck Corporation Truemotion 1, 2, and RT codecs (decoding only) FFV1
Libavcodec
Chinese smartphone
Realme. Realme has developed the Dirac Power Sound small speaker sound quality optimization technology jointly with Dirac Research AB to enhance the audio
Realme_5
List of Windows 11 operating system versions
working at all; e.g., Asphalt 8 (resolved since March 19, 2025), Dirac audio improvement software (if cridspapo.dll is utilized), and AutoCAD 2022. New features
Windows_11_version_history
Business incubator in Cambridge, United Kingdom
A second phase, Dirac House was completed in July 1989, and the self-contained Jeffreys Building was completed in February 1990. Dirac House is named after
St_John's_Innovation_Centre
Unconventional units of measurement intended as humor
Physicist Paul Dirac was known among his colleagues for his precise yet taciturn nature. His colleagues in Cambridge jokingly defined a unit of a dirac which was
List of humorous units of measurement
List_of_humorous_units_of_measurement
Open-source toolkit for cheminformatics
chemistry and solid-state physics software Open source ABINIT ACES (CFOUR) AIMAll BigDFT COLUMBUS CONQUEST CP2K Dalton DIRAC DP code FLEUR FreeON MADNESS MOPAC
RDKit
Superimposition of two or more exposures to create a single image
by a Dirac delta measure (flash) and a constant finite rectangular window, in combination. For example, a sensitivity window comprising a Dirac comb combined
Multiple_exposure
2021 Microsoft operating system version
functioning properly or not working at all; e.g., Asphalt 8 and Dirac audio improvement software (if cridspapo.dll is utilized). The basic system requirements
Windows_11
Computational quantum mechanical modelling method to investigate electronic structure
principle. An exchange-energy functional was added by Paul Dirac in 1928. However, the Thomas–Fermi–Dirac theory remained rather inaccurate for most applications
Density_functional_theory
Audio codec
Nero AAC Codec is a set of software tools for encoding and decoding Advanced Audio Coding (AAC) format audio, and editing MPEG-4 metadata. It was developed
Nero_AAC_Codec
compression format. WavPack – "Hybrid" (lossless/lossy) audio codec AV1 Dirac – a video compression format supporting both lossless and lossy compression
List_of_open_file_formats
Type of approximation to an underlying physical theory
Regularization Renormalization Vacuum state Wick's theorem Wightman axioms Equations Dirac equation Klein–Gordon equation Proca equations Wheeler–DeWitt equation Bargmann–Wigner
Effective_field_theory
Video compression format, succeeds H.264/MPEG-4 AVC
open-source codecs Versatile Video Coding – a codec develop by MPEG and ITU Dirac (video compression format) – an open format that is being developed by the
High_Efficiency_Video_Coding
Backend in computing
ACM/IEEE Supercomputing 2000: High Performance Networking and Computing. DIRAC: a scalable lightweight architecture for high throughput computing Grid
Cluster_manager
Branch of chemistry
although some progress has been made in solving the fully relativistic Dirac equation. In principle, it is possible to solve the Schrödinger equation
Computational_chemistry
Estimate object properties from a finite number of projections
) {\displaystyle \mu (x,y)} and δ ( ) {\displaystyle \delta ()} is the Dirac delta function. This function is known as the Radon transform (or sinogram)
Tomographic_reconstruction
2008 open and royalty-free video coding format
H.264. Compression-wise, VP8 offers better performance than Theora and Dirac. According to Glaser, the VP8 interface lacks features and is buggy, and
VP8
Video coding format developed by Microsoft
on 2028-08-24. AV1 Comparison of H.264 and VC-1 Video compression VC-2 (Dirac) Windows Media 9 Video Codec; SMPTE VC-1 (Full draft). Sustainability of
VC-1
Quantum chemistry algorithm
both the Lagrangian and the McLanchlan Variational Principle turn into the Dirac-Frenkel Variational Principle: ⟨ δ Ψ | i ∂ ∂ t − H | Ψ ⟩ = 0 {\displaystyle
Multi-configuration time-dependent Hartree
Multi-configuration_time-dependent_Hartree
Open-source AAC codec
Licensing or directly from the patent owners, and therefore FDK AAC Codec software may already be covered under those patent licenses when it is used for
Fraunhofer_FDK_AAC
Greek non-profit space exploration foundation
two identical 3U CubeSats, named LAMARR (after Hedy Lamarr) and DIRAC (after Paul Dirac), flying in close proximity of each other. The mission is supported
Libre_Space_Foundation
Computational chemistry software package
Parrinello in 1985 while working at SISSA, who were subsequently awarded the Dirac Medal by ICTP in 2009. In contrast to Born–Oppenheimer molecular dynamics
Car–Parrinello molecular dynamics
Car–Parrinello_molecular_dynamics
Fundamental physical law of electromagnetism
}{|\mathbf {r} |^{3}}}\right)=4\pi \delta (\mathbf {r} )} where δ(r) is the Dirac delta function, the result is ∇ ⋅ E ( r ) = 1 ε 0 ∫ ρ ( s ) δ ( r − s )
Coulomb's_law
Theory of subatomic structure
bound Exceptional Lie groups (G2, F4, E6, E7, E8) ADE classification Dirac string p-form electrodynamics Geometry Worldsheet Kaluza–Klein theory Compactification
String_theory
File format for storing digital video data
extension to derive which codec or program to use to play the files. The free software FFmpeg project's libraries have very wide support for encoding and decoding
Video_file_format
the audio & video codecs are integrated into Nero's Recode DVD ripping software. Nero certifies certain DVD player/recorder devices as Nero Digital compatible
Nero_Digital
26 December 2021. "FAQ – Diracvideo". Dirac Video Compression. Archived from the original on 15 April 2009. "Dirac". SourceForge (Repository). 4 June 2013
Comparison of video container formats
Comparison_of_video_container_formats
Video editing software
SVCD, DVD, x264/Blu-ray, ogg/mp4 ogm, Matroska mkv, dv, swf, Ogg Theora, Dirac, MNG, Snow, xvid, Flash and even animated GIF and PDF) Resampling of video
LiVES
Numerical method for solving physical or engineering problems
reference coordinate system. The process is often carried out using FEM software with coordinate data generated from the subdomains. The practical application
Finite_element_method
Widely used standard for video compression
Microsoft and approved as a SMPTE standard in 2006 Comparison of H.264 and VC-1 Dirac (video compression format), a video coding design by BBC Research & Development
Advanced_Video_Coding
Form of entertainment in mathematics
Conway, Roger Penrose, Ian Stewart, Timothy Gowers, Stephen Hawking and Paul Dirac. The Journal of Recreational Mathematics was the largest publication on
Recreational_mathematics
San Francisco-based venture capital firm
company to build that would have a material, positive impact on the world." Dirac: defense manufacturing AI startup that helps to build jet engines and submarines
Founders_Fund
Multivalued function in mathematics
involving exponentials (e.g. the maxima of the Planck, Bose–Einstein, and Fermi–Dirac distributions) and also occurs in the solution of delay differential equations
Lambert_W_function
Four-dimensional number system
{\displaystyle \mathbb {H} ^{\otimes 2}\otimes _{\mathbb {R} }\mathbb {C} } (Dirac algebra). A quaternion is an expression of the form a + b i + c j + d k
Quaternion
Mathematical function
diffusion. Specifically, if the mass-density at time t=0 is given by a Dirac delta, which essentially means that the mass is initially concentrated in
Gaussian_function
Method in computational fluid dynamics
\delta {\big (}x-X(s,t){\big )}\,ds,} where δ {\displaystyle \delta } is the Dirac δ function. The forcing can be extended to multiple dimensions to model
Immersed_boundary_method
Chemical species structure notation
Arthur Weininger (Pomona; Daylight CIS) and Jeremy Scofield (Cedar River Software, Renton, WA) for assistance in programming the system." The Environmental
Simplified Molecular Input Line Entry System
Simplified_Molecular_Input_Line_Entry_System
Distribution of variables which satisfies a stability property under linear combinations
upper bound corresponding to the normal distribution, and approaches the Dirac delta function in the limit as α → 0 {\displaystyle \alpha \rightarrow 0}
Stable_distribution
Approximation method in quantum physics
determinant, a determinant of one-particle orbitals first used by Heisenberg and Dirac in 1926, trivially satisfies the antisymmetric property of the exact solution
Hartree–Fock_method
Application of mathematical methods to other fields
past holders include Isaac Newton, Charles Babbage, James Lighthill, Paul Dirac, and Stephen Hawking. Schools with separate applied mathematics departments
Applied_mathematics
Physical quantities taking values at each point in space and time
mechanics were first applied to the electromagnetic field. In 1927, Paul Dirac used quantum fields to successfully explain how the decay of an atom to
Field_(physics)
New Zealand chemist (born 1962)
Association of Theoretical and Computational Chemists (WATOC) and received the Dirac Medal in 1999 and the Schrödinger Medal in 2011 from WATOC. In 2013, Gill
Peter_Gill_(chemist)
State-conducted cyberattacks on Russian institutions
Ukraine ransomware attacks 2016 Kyiv cyberattack Ukraine power grid hack Dirac, Jeremy (2024-07-27). "Ukraine Hacks ATMs Across Russia in Ongoing Massive
2024 Ukrainian cyberattacks against Russia
2024_Ukrainian_cyberattacks_against_Russia
Equation for two-body bound states
significantly more massive than the other, the system is simplified into the Dirac equation for the light particle under the external potential of the heavy
Bethe–Salpeter_equation
Algebra based on a vector space with a quadratic form
define the Dirac equation and introduce the Dirac operator. The entire Clifford algebra shows up in quantum field theory in the form of Dirac field bilinears
Clifford_algebra
Company based in Cranbury, New Jersey
in Mills' work, are incompatible with the Schrödinger, Klein–Gordon and Dirac equations, key equations in the study of quantum systems. In 2008, the Journal
Brilliant_Light_Power
Symmetry between bosons and fermions
statistics, and fermions, which have a half-integer-valued spin and follow Fermi–Dirac statistics. The names of bosonic partners of fermions are prefixed with
Supersymmetry
Origin and evolution of the symbols used to write equations and formulas
formulated by Dirac to explain the behavior of the relativistically moving electron. The Dirac equation in the form originally proposed by Dirac is: ( β m
History of mathematical notation
History_of_mathematical_notation
Reconstruction of a filtered signal
designing and applying a Wiener filter that shapes the estimated wavelet to a Dirac delta function (i.e., a spike). The result may be seen as a series of scaled
Deconvolution
place. "Schrödinger" – A Dirac codec implementation developed by David Schleef. Schrödinger (company), a scientific software company Schrödinger (Hellsing)
List of things named after Erwin Schrödinger
List_of_things_named_after_Erwin_Schrödinger
American physicist and science educator
mathematician Marcel Riesz inspired Hestenes to study a geometric interpretation of Dirac matrices. He obtained his Ph.D. from UCLA with a thesis entitled Geometric
David_Hestenes
Chemistry based on quantum physics
quantum chemical problem is usually solving the Schrödinger equation (or Dirac equation in relativistic quantum chemistry) with the electronic molecular
Quantum_chemistry
Form of entropy encoding used in data compression
The Dirac codec uses arithmetic coding and is not patent pending. Patents on arithmetic coding may exist in other jurisdictions; see software patents
Arithmetic_coding
Probability distribution
normal distribution to the case with zero variance can be defined using the Dirac delta measure δ μ {\textstyle \delta _{\mu }} , although the resulting random
Normal_distribution
Random process independent of past history
P_{0}(x,\cdot )=\delta _{x}} , where δ x {\displaystyle \delta _{x}} is the Dirac-measure in x {\displaystyle x} , and X : Ω × [ 0 , ∞ ) → S {\displaystyle
Markov_chain
Russian university
of phase transitions Alexander Polyakov – quantum field theory classics, Dirac'86 and Lorentz'94 Medals Emmanuel Rashba – Soviet-American theoretical physicist
Moscow Institute of Physics and Technology
Moscow_Institute_of_Physics_and_Technology
Branch of physics
Fermi–Dirac statistics. Using this idea, he developed the theory of paramagnetism in 1926. Shortly after, Sommerfeld incorporated the Fermi–Dirac statistics
Condensed_matter_physics
British astrophysicist (1882–1944)
discoverers of quantum mechanics, Paul Dirac, also pursued this line of investigation, which has become known as the Dirac large numbers hypothesis. A somewhat
Arthur_Eddington
Hungarian and American mathematician and physicist (1903–1957)
establish a rigorous mathematical framework for quantum mechanics, known as the Dirac–von Neumann axioms, in his influential 1932 work Mathematical Foundations
John_von_Neumann
Emission of electrons induced by an electrostatic field
conduction band, with the electron states occupied in accordance with Fermi–Dirac statistics. The Fowler-Nordheim theory explained both the Millikan–Lauritsen
Field_electron_emission
DIRAC SOFTWARE
DIRAC SOFTWARE
Boy/Male
Indian
Old Arabic name
Girl/Female
Tamil
Beautiful, Splendor, Derived from Indira - Goddess laxmis name
Boy/Male
Muslim
Scholar
Girl/Female
Indian
Beautiful, Splendor, Derived from Indira - Goddess laxmis name
Boy/Male
Muslim
Old Arabic name
Boy/Male
Indian
Scholar
DIRAC SOFTWARE
DIRAC SOFTWARE
Boy/Male
Muslim
Affectionate, Compassionate, Soft, Pardoning, Tender, Kind
Girl/Female
Muslim
Ray of light
Girl/Female
Hindu, Indian
Hands Full of Gold; Prosperity
Girl/Female
Arabic, Swahili
Woman; Life; Alive
Male
Hebrew
(×—Ö´×™×ֵל) Hebrew name CHIY'EL means "God lives." In the bible, this is the name of one of the rebuilders of Jericho.
Female
Russian
(КатÑ) Pet form of Russian Ekaterina and Yekaterina, KATJA means "pure."
Girl/Female
French, German, Hebrew
Spear Ruler; The Lord is Exalted
Girl/Female
Irish
All these variations refer to the famous Irish woman bethrothed to King Mark of Cornwall who fell in love with his nephew Tristan when they drank a love potion by mistake.
Girl/Female
Australian, French
Air of Mystery
Female
English
English form of Latin Prudentia, PRUDENCE means "cautious." This is a virtue name popular with the Puritans. Some others are Charity, Chastity, Faith, Honor, and Hope.
DIRAC SOFTWARE
DIRAC SOFTWARE
DIRAC SOFTWARE
DIRAC SOFTWARE
DIRAC SOFTWARE
n.
A small branching shrub (Dirca palustris), with a white, soft wood, and a tough, leathery bark, common in damp woods in the Northern United States; -- called also moosewood, and wicopy.