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United States historic place
The Variable Density Tunnel (VDT) was the second wind tunnel at the National Advisory Committee for Aeronautics (NACA) Langley Research Center. Proposed
Variable_Density_Tunnel
Railway line in the Klang Valley, Malaysia
December 2016. On 30 May 2013, tunnel excavation works for the Kajang Line began with the world's first Variable Density Tunnel Boring Machine (VDTBM). This
Kajang_Line
United States historic place
supporting aeronautics research. After the construction of the Variable Density Tunnel at Langley in 1921, the National Advisory Committee for Aeronautics
Unitary Plan Wind Tunnel (Mountain View, California)
Unitary_Plan_Wind_Tunnel_(Mountain_View,_California)
United States wind tunnel
Reynolds number in the smaller wind tunnels. NACA had been using the Variable Density Tunnel in order to increase the density of air to keep the Reynolds number
Propeller_Research_Tunnel
Predecessor to NASA (1915-1958)
wind tunnel design. Atmospheric 5-ft wind tunnel (1920) Variable Density Tunnel (1922) Propeller Research Tunnel (1927) High-speed 11-in wind tunnel (1928)
National Advisory Committee for Aeronautics
National_Advisory_Committee_for_Aeronautics
German aerospace engineer (1890–1986)
Munk began work at NACA in 1920 and proposed building the new Variable Density Tunnel (VDT) which went into operation in 1922. Munk published more than
Max_Munk
Mathematical process by William Froude
the same series of airfoils in a different wind tunnel had been used, but the variable-density tunnel tests are probably the most reliable of all. Some
Blade_element_theory
2024. "ONERA Mondane Wind Tunnel". ONERA. 16 November 2017. Retrieved 26 January 2024. "S2MA Continuous-flow wind tunnel, Variable pressure, Mach 0.1 to Mach
List_of_wind_tunnels
American aerospace engineer (1906–1988)
in the variable density wind tunnel", 1932, NASA Technical Report Server. "Airfoil section data obtained in the NACA variable-density tunnel as affected
Ira_Abbott
American aerospace engineer
one of his first tasks was to design the balance system for a variable-density wind tunnel. Soon after joining Langley, he moved to the flight test arm
Smith_J._DeFrance
76.344153°W / 37.076826; -76.344153 (Variable Density Tunnel) Hampton (city) Steel tank from a wind tunnel at Langley Research Center. (use source
List of National Historic Landmarks in Virginia
List_of_National_Historic_Landmarks_in_Virginia
American aerospace engineer (1906–1972)
on a wing. He was part of the Bell X-1 team. He worked with the Variable Density Tunnel, on compressible airflow. John Stack The Compressibility Burble
John_Stack_(engineer)
Research laboratory in Cambridge, England
the National Centre for Propulsion and Power, providing a new variable density tunnel and rotating test stand as well as the existing experimental facilities
Whittle_Laboratory
Military unit
National Aerospace Solutions. Tunnel A is a 48-inch squared, continuous, closed-circuit, variable density, supersonic wind tunnel with a Mach number range
Von Karman Gas Dynamics Facility
Von_Karman_Gas_Dynamics_Facility
Probability density of electrons being somewhere
variables and is typically denoted as either ρ ( r ) {\displaystyle \rho ({\textbf {r}})} or n ( r ) {\displaystyle n({\textbf {r}})} . The density is
Electron_density
in many parts of the city centre. 9 January – The world's first Variable Density Tunnel Boring Machines make its breakthrough at the under construction
2014_in_Malaysia
Quantum mechanical phenomenon
In physics, quantum tunnelling, barrier penetration, or simply tunnelling is a quantum mechanical phenomenon in which an object such as an electron or
Quantum_tunnelling
Magnetic effect in insulators between ferromagnets
Tunnel magnetoresistance (TMR) is a magnetoresistive effect that occurs in a magnetic tunnel junction (MTJ), which is a component consisting of two ferromagnets
Tunnel_magnetoresistance
deficit Vapour density Variable-mass system Variable-sweep wing Variable Density Tunnel Variable mass hypothesis Variable speed of light Variables and some
Index_of_physics_articles_(V)
Mathematical tool in quantum physics
In quantum mechanics, a density matrix (or density operator) is a matrix used in calculating the probabilities of the outcomes of measurements performed
Density_matrix
Variable Density Tunnel
National Register of Historic Places listings in Hampton, Virginia
National_Register_of_Historic_Places_listings_in_Hampton,_Virginia
Extension of scanning tunneling microscopy
Scanning tunneling spectroscopy (STS), an extension of scanning tunneling microscopy (STM), is used to provide information about the density of electrons
Scanning tunneling spectroscopy
Scanning_tunneling_spectroscopy
Type of quantum mechanics theory
In physics, a hidden-variable theory is a deterministic model which seeks to explain the probabilistic nature of quantum mechanics by introducing additional
Hidden-variable_theory
Physics phenomenon
from quantum entanglement cannot be explained in terms of local hidden variables, i.e., properties contained within the individual particles themselves
Quantum_entanglement
Number of available physical states per energy unit
calculation of their densities of states. In spherically symmetric systems, the integrals of functions are one-dimensional because all variables in the calculation
Density_of_states
Interpretation of quantum mechanics
the interpretation of quantum mechanics, a local hidden-variable theory is a hidden-variable theory that satisfies the principle of locality. These models
Local_hidden-variable_theory
American aerodynamicist (1902–1987)
a variable density wind tunnel that could operate with high Reynolds numbers. He was also officially the head of the Variable Density Wind Tunnel Division
Eastman_Jacobs
Branch of fluid mechanics
momentum, with the fluid density presumed constant. In compressible flow, however, the gas density and temperature also become variables. This requires two
Compressible_flow
Wing shape
characteristics of 78 related airfoil sections from tests in the variable-density wind tunnel". NACA, 1933. "Fundamentals of aerodynamics", John D. Anderson
NACA_airfoil
Tunneling diode
A resonant-tunneling diode (RTD) is a diode with a resonant-tunneling structure in which electrons can tunnel through some resonant states at certain energy
Resonant-tunneling_diode
Research facility in France
The MARHy Hypersonic low density Wind Tunnel, located at the ICARE Laboratory in Orléans, France, is a research facility used extensively for fundamental
MARHy_Wind_Tunnel
Mathematical entity to describe the probability of each possible measurement on a system
mechanics. A classical dynamical state consists of a set of dynamical variables with well-defined real values at each instant of time. For example, the
Quantum_state
Emission of electrons induced by an electrostatic field
another ("Zener tunneling"), takes place by a field-induced tunneling process that can be regarded as a form of Fowler–Nordheim tunneling. For example,
Field_electron_emission
Value for the flow of probability in quantum mechanics
the probability current (i.e. the probability current density) is related to the probability density function via a continuity equation. The probability
Probability_current
Fact that observing a situation changes it
self-adjoint operator that represents the possible results of a random variable. Observer (special relativity) Dirac, P.A.M. (1967). The Principles of
Observer_effect_(physics)
Rock that has been eroded by wind-driven sand or ice crystals
studied through the execution of wind tunnel experiments. Wind tunnels operate as artificial environments with variables that can be controlled and measured
Ventifact
Device converting an AC waveform to another AC waveform
compressor and wind-tunnel drives, or for variable-speed applications such as cement kilns. In order to achieve higher power density and reliability, matrix
AC-to-AC_converter
Quantum physics concept
physical quantities that classical mechanics had treated as real-valued variables become self-adjoint operators on a Hilbert space. These operators, called
Complementarity_(physics)
Quantum physical phenomenon
or other schemes where the phase and charge are conjugate variables. Superconducting tunnel junction detectors are used in superconducting cameras A Josephson
Josephson_effect
Calculation rule in quantum mechanics
result. In one commonly used application, it states that the probability density for finding a particle at a given position is proportional to the square
Born_rule
related to 2D gases. If the density of a 2D liquid is decreased, a 2D gas is formed. This was observed by scanning tunnelling microscopy under ultra-high
Two-dimensional_liquid
Theorem in quantum mechanics
valid density operator. By introducing a probability distribution over the possible values of λ → {\displaystyle {\vec {\lambda }}} , a hidden-variable model
Gleason's_theorem
Relativistic wave equation in quantum mechanics
directly. Stationary solutions for a Coulomb potential use separation of variables, where the field is written as ϕ ( x ) = e − i ϵ t Φ ( x ) {\displaystyle
Klein–Gordon_equation
Relativistic quantum mechanical wave equation
anti-commuting Grassmann-valued field that only acts as an integration variable. The Dirac equation then emerges as the classical saddle point behaviour
Dirac_equation
Interpretation of quantum mechanics
decoherence interpretations, the Copenhagen interpretation, and hidden variable theories such as Bohmian mechanics. In the many-worlds interpretation,
Many-worlds_interpretation
Shock wave that is inclined with respect to the incident upstream flow direction
achievable Mach number to roughly 1.6. Concorde (which first flew in 1969) used variable geometry wedge-shaped intakes to achieve a maximum speed of Mach 2.2.[citation
Oblique_shock
Background energy existing in space
nature of the particles (or fields) that generate vacuum energy, with a density such as that required by inflation theory, remains a mystery. Arthur C
Vacuum_energy
Theories about the end of the universe
the Big Bang theory, specifically that the universe tunneled into existence and had a finite density consistent with quantum mechanics, before evolving
Ultimate_fate_of_the_universe
Set of mathematical concepts in quantum gravity
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Quantum_geometry
Building material consisting of aggregates cemented by a binder
materials of the future. The variable density is normally described in kg per m3, where regular concrete is 2400 kg/m3. Variable density can be as low as 300 kg/m3
Types_of_concrete
Procedure in quantum mechanics
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Transformation theory (quantum mechanics)
Transformation_theory_(quantum_mechanics)
Theorem in quantum mechanics
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Ehrenfest_theorem
Equation for the force of drag
Suppose that the fluid is a liquid, and the variables involved – under some conditions speed u, fluid density ρ, kinematic viscosity ν of the fluid, size
Drag_equation
Motorway in Sydney
widened and tolled as part of WestConnex. M4 East Motorway, an eastern tunnel extension of the M4 from Homebush to Rozelle was completed between 2019
M4_Motorway_(Sydney)
instantly teleport up to 2.5 miles. Carries heat-seeking missiles and variable-caliber machine guns. When Unicron creates Cyclonus, both Skywarp and Bombshell
List of The Transformers characters
List_of_The_Transformers_characters
Ratio of inertial to viscous forces acting on a liquid
equivalent diameter defined. For fluids of variable density such as compressible gases or fluids of variable viscosity such as non-Newtonian fluids, special
Reynolds_number
Process by which a quantum system takes on a definitive state
includes hidden-variable theories like de Broglie–Bohm theory; here random outcomes only result from unknown values of hidden variables. Results from tests
Wave_function_collapse
Semiconductor memory technology
engineering concepts are used to modify the tunneling barrier properties to create "variable thickness" tunnel dielectric. For example, triple ultra-thin
Charge_trap_flash
Structure made from hay
period, were used from the 1860s for sheaves of cereals and then for low-density bales of hay or straw. The small haystacks used for drying loose hay in
Haystack
Description of physical properties at the atomic and subatomic scale
stars, and applications such as scanning tunnelling microscopy, tunnel diode and tunnel field-effect transistor. When quantum systems interact, the result
Quantum_mechanics
Transfer of electrical energy through a usually-insulating boundary
or holes) tunnel through an insulating region. Leakage increases exponentially as the thickness of the insulating region decreases. Tunneling leakage can
Leakage_(electronics)
530 km (2193 miles) of motorways and expressways, and with a motorway density of 64 kilometres per 1,000 km2 (103 miles per 1000 sq. mi.), the country
Road transport in the Netherlands
Road_transport_in_the_Netherlands
Branch of structural mechanics
structure. In reinforced concrete structures, the damage state variable quantifies the crack density in the plastic hinge zone; in unreinforced concrete components
Lumped_damage_mechanics
Flow of electric charge
circuit element can flow in either of two directions. When defining a variable I {\displaystyle I} to represent the current, the direction representing
Electric_current
Process of combining atomic nuclei
Fusion processes require an extremely large triple product of temperature, density, and confinement time. These conditions occur only in stellar cores, advanced
Nuclear_fusion
Analysis and solving of problems that involve fluid flows
C-FANS): Start with the C-NS. Assume that any flow variable f {\displaystyle f} , such as density, velocity and pressure, can be represented as f = F
Computational_fluid_dynamics
Interpretation of quantum mechanics
emitted. Max Born then realized that in Heisenberg's theory, the classical variables of position and momentum would instead be represented by matrices, mathematical
Copenhagen_interpretation
Models for electric current flow
At low carrier densities, the Mott formula for temperature-dependent conductivity is used to describe hopping transport. In variable hopping it is given
Charge_transport_mechanisms
Quantum mechanics principle
intense magnetic fields such as in neutron stars, although at a much higher density than in ordinary matter. It is a consequence of general relativity that
Pauli_exclusion_principle
Principle of quantum mechanics
|n\rangle } are the energy eigenstates of the Hamiltonian. For continuous variables like position eigenstates, | x ⟩ {\displaystyle |x\rangle } : | α ⟩ =
Quantum_superposition
Theory to explain the emergence of the classical world from the quantum world
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Quantum_Darwinism
Description of a quantum-mechanical system
led to a problem with probability density even though it was a relativistic wave equation. The probability density could be negative, which is physically
Schrödinger_equation
Quantum mechanics mathematical equation
is the thermodynamic beta, ρ ^ 0 {\displaystyle {\hat {\rho }}_{0}} is density operator, given by ρ 0 ^ = e − β H ^ 0 = ∑ n | n ⟩ ⟨ n | e − β E n {\displaystyle
Kubo_formula
Theoretical problem in quantum physics
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Measurement_problem
Energy level splitting due to strong light-matter coupling
Hamiltonian Measurement Nonlocality Quantum number State Superposition Symmetry Tunnelling Uncertainty Wave function Collapse Experiments Bell's inequality Davisson–Germer
Rabi_splitting
Term in quantum field theory
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
(−1)F
Hydrodynamic formulation of the Schrödinger equations
spinless non-relativistic particle, written in terms of hydrodynamical variables, similar to the Navier–Stokes equations of fluid dynamics. The derivation
Madelung_equations
Superconducting circuit element
(such as an insulator) separating two superconductors. Pairs of electrons tunnel through the barrier, producing an effective inductance that is dependent
Josephson_junction
Quantum states of two qubits
pair given above – namely this "agreement", called more formally a hidden variable. In his famous paper of 1964, John S. Bell showed by simple probability
Bell_state
Mathematical description of quantum state
discrete-variable configurations, D ⊆ A, and ω in some or all possible continuous-variable configurations, C ⊆ Ω, is the sum and integral over the density, P
Wave_function
American ethologist and behavioral researcher (1917-1995)
Animals (1948) Social Welfare as a Variable in Population Dynamics (1957) OCLC 929878499 Calculation of Home Range and Density of Small Mammals (with James
John_B._Calhoun
Transport condition characterized by slower speed and high density
all times of day), variable (higher at peak times), or dynamic (higher during actual congestion) toll roads, toll bridges, toll tunnels, and toll lanes Managed
Traffic_congestion
Concept applicable to the testing of engineering models
techniques from continuum mechanics. The variables which describe the system are: This example has five independent variables and three fundamental units. The
Similitude
Branch of dynamics concerned with studying the motion of air
aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed a rational basis for
Aerodynamics
motivation to use the tunneling time is that when it crosses the spectra, it passes through the region of the maximum of the density of states, thus de-correlating
Multicanonical_ensemble
Surname list
female judge in Germany Max Munk (1890–1986), NASA, aerodynamics, Variable-Density Wind tunnel 1921 Nina Munk (born 1967), American journalist and non-fiction
Munk
Solar power cell with multiple band gaps from different materials
Consequently, current density through the tunnel junction is high (with maximum value of J P {\displaystyle J_{P}} , the peak current density) and the slope
Multi-junction_solar_cell
Deviations from local realism
multipartite quantum system do not allow an interpretation with local hidden variables. Quantum nonlocality has been experimentally verified under a variety
Quantum_nonlocality
Quantum mechanical state change
ISSN 0031-9007. Clauser, John F. (1969). "Proposed Experiment to Test Local Hidden-Variable Theories". Physical Review Letters. 23 (15): 880–884. Bibcode:1969PhRvL
Spontaneous_emission
Hypothetical interface between quantum events and a classical observer
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Heisenberg_cut
Extension of the Bohr model
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Bohr–Sommerfeld_model
Loss of quantum coherence
agnostic about interpretation, focusing instead on specific problems of density-matrix dynamics. Zurek's interest in decoherence stemmed from furthering
Quantum_decoherence
Suitably normalized antisymmetrization of the phase-space star product
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Moyal_bracket
Problem in physics and quantum mechanics
Configuration interaction Coupled cluster Various Monte-Carlo approaches Density functional theory Lattice gauge theory Matrix product state Neural network
Many-body_problem
Class of theories in quantum mechanics
them, the assumptions of the theorem are no longer fulfilled. A hidden-variable theory which is superdeterministic can thus fulfill Bell's notion of local
Superdeterminism
Force resulting from the quantisation of a field
allows the energy density in very small regions of space to be negative relative to the ordinary vacuum energy, and the energy densities cannot be arbitrarily
Casimir_effect
State of matter
variation of density is referred to as compressibility. Like pressure and temperature, density is a state variable of a gas and the change in density during
Gas
Testable implication of local hidden-variable theories
particular trial being given by the density function ρ(λ), the integral of which over the complete hidden variable space is 1. We thus assume we can write:
CHSH_inequality
Quantum operator
collapse Consistent histories Copenhagen de Broglie–Bohm Ensemble Hidden-variable Many-worlds Objective-collapse Quantum logic Superdeterminism Relational
Rotation operator (quantum mechanics)
Rotation_operator_(quantum_mechanics)
DRAM reliability issue
Variable retention time (also known as VRT) is a reliability issue in dynamic random-access memory (DRAM) characterized by unpredictable fluctuations in
Variable_retention_time
VARIABLE DENSITY-TUNNEL
VARIABLE DENSITY-TUNNEL
Boy/Male
Hindu, Indian
Valuable
Girl/Female
Indian
Valuable
Surname or Lastname
English (Somerset)
English (Somerset) : apparently a habitational name from an unidentified place. It is probably a variant of Denslow or possibly Denley, neither of which are of identified origin.
Boy/Male
Indian
Royal Boy
Surname or Lastname
English
English : from the feminine personal name Mirabel, equated in medieval records with Latin mirabilis ‘marvellous’, ‘wonderful’ (in the sense ‘extraordinary’).
Girl/Female
Assamese, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Valuable
Girl/Female
Gujarati, Hindu, Indian
Valuable
Boy/Male
Arabic, Indian, Muslim
Valuable
Boy/Male
Greek
Amiable.
Boy/Male
Hawaiian
Valuable.
Girl/Female
Tamil
Valuable
Boy/Male
Tamil
Amiable
Boy/Male
Hindu
Amiable
Boy/Male
Hindi
Valuable.
Boy/Male
Vietnamese
Valuable.
Girl/Female
Indian
Another Name of Happness
Girl/Female
American, Australian
God is My Judge
Girl/Female
Armenian
Valuable.
Boy/Male
Arabic, Bengali, Hindu, Indian, Kannada, Marathi, Muslim, Telugu
Valuable
Boy/Male
Anglo, British, English
Variable
VARIABLE DENSITY-TUNNEL
VARIABLE DENSITY-TUNNEL
Girl/Female
Tamil
Vanalika | வாநலிகா
Sunflower
Boy/Male
Arabic
One who serves a wise man.
Girl/Female
Indian
A buck, Deer, Name of a well
Surname or Lastname
English (West Midlands)
English (West Midlands) : from the Norman personal name Hubald, composed of the Germanic elements hug ‘heart’, ‘mind’, ‘spirit’ + bald ‘bold’, ‘brave’.
Girl/Female
English Anglo Saxon
Brings joy.
Boy/Male
Indian
Desire
Girl/Female
English
Based on the initials J. C. or an abbreviation of Jacinda.
Girl/Female
Irish
An Irish form of Jane “God is gracious†and may be a shortened form of Sinead.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi, Telugu
Lord of Earth; Vishnu:
Boy/Male
Arabic, Muslim
Little Father
VARIABLE DENSITY-TUNNEL
VARIABLE DENSITY-TUNNEL
VARIABLE DENSITY-TUNNEL
VARIABLE DENSITY-TUNNEL
VARIABLE DENSITY-TUNNEL
a.
Having the capacity of varying or changing; capable of alternation in any manner; changeable; as, variable winds or seasons; a variable quantity.
a.
Possessing sweetness of disposition; having sweetness of temper, kind-heartedness, etc., which causes one to be liked; as, an amiable woman.
a.
Liable to vary; too susceptible of change; mutable; fickle; unsteady; inconstant; as, the affections of men are variable; passions are variable.
n.
The condition of being the same with something described or asserted, or of possessing a character claimed; as, to establish the identity of stolen goods.
a.
Invariable.
n.
A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.
a.
Friendly; kindly; sweet; gracious; as, an amiable temper or mood; amiable ideas.
n.
Rarily; rareness; thinness, as of a fluid; as, the tenuity of the air; the tenuity of the blood.
v. t.
To represent by parable.
n.
That which is variable; that which varies, or is subject to change.
a.
Worthy; estimable; deserving esteem; as, a valuable friend; a valuable companion.
n.
Depth of shade.
n.
An invariable quantity; a constant.
n.
The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.
a.
Having value or worth; possessing qualities which are useful and esteemed; precious; costly; as, a valuable horse; valuable land; a valuable cargo.
a.
Liable to undergo a judicial examination; properly coming under the cognizance of a court; as, a cause may be triable before one court which is not triable in another.
n.
The quality or state of being tenuous; thinness, applied to a broad substance; slenderness, applied to anything that is long; as, the tenuity of a leaf; the tenuity of a hair.
n.
Arable land; plow land.
adv.
In a variable manner.
a.
Arable; tillable.