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searching for Molecular diffusion 57 found (95 total)

Heterosphere (294 words) [view diff] exact match in snippet view article find links to article

the layer of an atmosphere where the gases are separated out by molecular diffusion with increasing altitude such that lighter species become more abundant

Mass diffusivity (1,524 words) [view diff] exact match in snippet view article find links to article

written as the proportionality constant between the molar flux due to molecular diffusion and the negative value of the gradient in the concentration of the

Sherwood number (544 words) [view diff] exact match in snippet view article find links to article

{1}{2}}\,\mathrm {Sc} ^{\frac {1}{3}}} This form is applicable to molecular diffusion from a single spherical particle. It is particularly valuable in

Dispersion (chemistry) (2,010 words) [view diff] exact match in snippet view article

generated. This process is facilitated by molecular diffusion and convection. With respect to molecular diffusion, dispersion occurs as a result of an unequal

Ice VII (1,325 words) [view diff] exact match in snippet view article find links to article

diffusion (movement of protons around the oxygen lattice) dominates molecular diffusion, an effect which has been measured directly. Scientists hypothesize

Intravoxel incoherent motion (3,420 words) [view diff] exact match in snippet view article find links to article

this model, biological tissue contains two distinct environments: molecular diffusion of water in the tissue (sometimes referred to as 'true diffusion')

Peter Stilbs (373 words) [view diff] case mismatch in snippet view article find links to article

article "Fourier Transform Pulsed-Gradient Spin-Echo Studies of Molecular Diffusion" (which has almost 2000 citations to date) and a more recent monograph

Rheological weldability (1,600 words) [view diff] exact match in snippet view article find links to article

intimate contact between the components being joined and initiate inter-molecular diffusion across the joint and the third step is cooling. RW can be used to

Hydrogeology (8,021 words) [view diff] no match in snippet view article find links to article

Hydrogeology (hydro- meaning water, and -geology meaning the study of the Earth) is the area of geology that deals with the distribution and movement of

Diffusion MRI (8,939 words) [view diff] exact match in snippet view article find links to article

mainly water, in biological tissues, in vivo and non-invasively. Molecular diffusion in tissues is not random, but reflects interactions with many obstacles

Hydrogen ion (1,500 words) [view diff] exact match in snippet view article find links to article

pressure of CO2 leads to an increased oceanic exchange of this gas by molecular diffusion. In the surface waters, dissolved atmospheric carbon dioxide (CO2(aq))

Diffusion-limited escape (3,683 words) [view diff] exact match in snippet view article find links to article

escape on Earth is diffusion-limited. By considering one dimensional molecular diffusion of H2 through a heavier background atmosphere, you can derive a formula

Drying (1,578 words) [view diff] exact match in snippet view article find links to article

migration from the product interior to the surface is mostly by molecular diffusion, i.e. the water flux is proportional to the moisture content gradient

Magnetic resonance imaging of the brain (1,894 words) [view diff] case mismatch in snippet view article find links to article

Science: 12. 1987. Le Bihan D, Breton E (1987). "Method to Measure the Molecular Diffusion and/or Perfusion Parameters of Live Tissue". US Patent # 4,809,701

Chromosome territories (437 words) [view diff] exact match in snippet view article find links to article

been reported to tunnel into chromosome territories to facilitate molecular diffusion into the otherwise tightly packed chromosome-occupied regions. The

Nuclear magnetic resonance quantum computer (1,458 words) [view diff] exact match in snippet view article find links to article

rather than a liquid sample. This has many advantages such as lack of molecular diffusion decoherence, lower temperatures can be achieved to the point of suppressing

Thermophoresis (1,623 words) [view diff] exact match in snippet view article find links to article

Molecular diffusion under the effect of a thermal gradient

E. Bruce Watson (426 words) [view diff] exact match in snippet view article find links to article

elements between minerals, silicate melts and fluids; atomic and molecular diffusion in crystals, silicate melts and supercritical water; equilibrium

Knudsen diffusion (942 words) [view diff] exact match in snippet view article find links to article

However there may be instances where both Knudsen diffusion and molecular diffusion DAB{\displaystyle D_{AB}} are important. The effective diffusivity

Beth L. Parker (1,391 words) [view diff] exact match in snippet view article find links to article

2021-09-10. Retrieved September 10, 2021. Parker, Beth (1996). Effects of molecular diffusion on the persistence of dense, immiscible phase organic liquids in

Diffusion pump (1,246 words) [view diff] exact match in snippet view article find links to article

viscous flow and mixing to pump gas, whereas diffusion pumps use molecular diffusion. This has several consequences. In diffusion pumps, the inlet pressure

Smoldyn (833 words) [view diff] exact match in snippet view article find links to article

focus on molecular diffusion, interaction with surfaces, and interactions with each other. This enables simulation of: molecular diffusion and drift

Self-ionization of water (2,069 words) [view diff] exact match in snippet view article find links to article

diffusion-controlled reaction, in which the rate is limited by the speed of molecular diffusion. Water molecules dissociate into equal amounts of H3O+ and OH−, so

Electrohydrodynamics (1,161 words) [view diff] exact match in snippet view article find links to article

conductivity interfaces grows faster than the dissipative effect of molecular diffusion. Since these flows are characterized by low velocities and small

Diffusion tube (939 words) [view diff] exact match in snippet view article find links to article

tubes sampling these gases all work through the same process of molecular diffusion, there are important differences. Nitrogen dioxide tubes use triethanolamine

Horse hoof (2,765 words) [view diff] exact match in snippet view article find links to article

cells acquire their oxygen and nutrients by fluid exchanges and molecular diffusion from the underlying dermis, flowing into microscopical spaces among

Photonic crystal sensor (1,513 words) [view diff] case mismatch in snippet view article find links to article

(2019-05-08). "Flory–Huggins Photonic Sensors for the Optical Assessment of Molecular Diffusion Coefficients in Polymers". ACS Applied Materials & Interfaces. 11

Cape Grim Air Archive (913 words) [view diff] exact match in snippet view article find links to article

across the tropopause in the case of stratospheric samples, and molecular diffusion and gravitational settling in the firn column for air retrieved from

Turbulence (5,331 words) [view diff] exact match in snippet view article find links to article

Eventually this process creates structures that are small enough that molecular diffusion becomes important and viscous dissipation of energy finally takes

Greenhouse gas emissions from wetlands (3,620 words) [view diff] exact match in snippet view article find links to article

produced, methane can reach the atmosphere via three main pathways: molecular diffusion, transport through plant aerenchyma, and ebullition. Primary productivity

Markstein number (761 words) [view diff] exact match in snippet view article find links to article

1016/S0010-2180(02)00383-8. Clavin, Paul, and F. A. Williams. "Effects of molecular diffusion and of thermal expansion on the structure and dynamics of premixed

Dimensionless numbers in fluid mechanics (811 words) [view diff] exact match in snippet view article find links to article

Sc=νD{\displaystyle \mathrm {Sc} ={\frac {\nu }{D}}} mass transfer (viscous over molecular diffusion rate) Shape factor H H=δ∗θ{\displaystyle H={\frac {\delta ^{*}}{\theta

Johan Sandström (1,041 words) [view diff] exact match in snippet view article find links to article

pressure. As a result, internal diabatic heating/cooling due to molecular diffusion explains why laboratory experiments show evidence of circulations

Molecular machine (5,804 words) [view diff] exact match in snippet view article find links to article

macroscopic automobiles and are important for understanding how to control molecular diffusion on surfaces. The image on the right shows an example with wheels

Atmospheric tide (3,065 words) [view diff] exact match in snippet view article find links to article

on a beach, the energy dissipates into the background atmosphere. Molecular diffusion also becomes increasingly important at higher levels in the lower

Nuclear magnetic resonance spectroscopy of carbohydrates (1,522 words) [view diff] exact match in snippet view article find links to article

regions 1H DOSY 2D NMR plot with proton spectra as a function of molecular diffusion coefficient measurement of diffusion coefficient, estimate of molecular

Taylor dispersion (2,560 words) [view diff] exact match in snippet view article find links to article

dispersion of a solute in a stream of solvent can be used to measure molecular diffusion". Proceedings of the Royal Society of London, Series A. 225 (1163):

High-frequency ventilation (2,949 words) [view diff] exact match in snippet view article find links to article

Pendelluft effect, asymmetrical velocity profiles, cardiogenic mixing and molecular diffusion) of gas transfer are believed to come into play in HFOV compared

Interfacial polymerization (2,302 words) [view diff] exact match in snippet view article find links to article

time, y is a coordinate normal to the surface/interface, Di is the molecular diffusion coefficient of the functional groups of interest, and Ji is the thermodynamic

Ceramic engineering (7,264 words) [view diff] exact match in snippet view article find links to article

a "green body" is made, it is fired in a kiln, where atomic and molecular diffusion processes give rise to significant changes in the primary microstructural

Chaotic mixing (3,298 words) [view diff] exact match in snippet view article find links to article

responsible for fluid mixing: diffusion and advection. In liquids, molecular diffusion alone is hardly efficient for mixing. Advection, that is the transport

Maria D. Ellul (478 words) [view diff] exact match in snippet view article find links to article

February 2023. Ellul, M.D.; Gent, A.N. (November 1984). "The role of molecular diffusion in the adhesion of elastomers". Journal of Polymer Science: Polymer

Waste Isolation Pilot Plant (6,151 words) [view diff] exact match in snippet view article find links to article

the overall hydraulic conductivities (water permeabilities) and molecular diffusion coefficients. These are on the order of ≤10−14 m/s and ≤10−15 m2/s

Photonic crystal (7,086 words) [view diff] case mismatch in snippet view article find links to article

2019). "Flory–Huggins Photonic Sensors for the Optical Assessment of Molecular Diffusion Coefficients in Polymers". ACS Applied Materials & Interfaces. 11

Self-healing material (12,295 words) [view diff] exact match in snippet view article find links to article

alternative method for achieving intrinsic self-healing is based on molecular diffusion. Reversible systems are polymeric systems that can revert to the

Hydrogel encapsulation of quantum dots (2,053 words) [view diff] case mismatch in snippet view article find links to article

Loading and Diffusion in a Fluorinated PEG Hydrogel Studied by 1H Molecular Diffusion NMR and 19F Spin Diffusion NMR". Colloid and Polymer Science. 288

Jörg Kärger (1,462 words) [view diff] exact match in snippet view article find links to article

determined by his work on the use of NMR spectroscopy to measure molecular diffusion in nanoporous materials (zeolites), which he had already begun during

Pore structure (2,318 words) [view diff] exact match in snippet view article find links to article

transport behavior of electrical conductivity, fluid permeation, molecular diffusion, and heat transfer in geoscience, impacting petrophysical parameters

Large eddy simulation (6,756 words) [view diff] exact match in snippet view article find links to article

dissipation of kinetic energy at sub-grid scales as analogous to molecular diffusion. In this case, the deviatoric part of τij{\displaystyle \tau _{ij}}

Field flow fractionation (3,689 words) [view diff] no match in snippet view article find links to article

FFF calibration constants closely describe the ratio of ordinary (molecular) diffusion coefficient D to thermal diffusion coefficient (or, thermophoretic

List of dimensionless quantities (784 words) [view diff] exact match in snippet view article find links to article

\mathrm {Sc} _{D}={\frac {\nu }{D}}} mass transfer (viscous over molecular diffusion rate) Shape factor H H=δ∗θ{\displaystyle H={\frac {\delta ^{*}}{\theta

Representations of the atmospheric boundary layer in global climate models (1,582 words) [view diff] exact match in snippet view article find links to article

point. Additionally, local closure likens turbulent transport to molecular diffusion, and is usually first or second order. The second method of parameterizing

List of systems biology modeling software (3,383 words) [view diff] exact match in snippet view article find links to article

interest as an individual particle in continuous space, simulating molecular diffusion, molecule-membrane interactions and chemical reactions. The following

Lagrangian ocean analysis (2,210 words) [view diff] exact match in snippet view article find links to article

For a Lagrangian ocean analysis code to include the effects of molecular diffusion, or other small-scale mixing which may be modelled as a diffusive

William Halperin (1,845 words) [view diff] exact match in snippet view article find links to article

Bhattacharja, S., Halperin, W. P., Eguchi, K., & Mizusaki, T. (1990). Molecular diffusion and nuclear-magnetic-resonance relaxation of water in unsaturated

History of magnetic resonance imaging (3,714 words) [view diff] case mismatch in snippet view article find links to article

April 1987. Le Bihan, D.; Breton, E. (1987). "Method to Measure the Molecular Diffusion and/or Perfusion Parameters of Live Tissue". US Patent # 4,809,701

Sediment Profile Imagery (8,663 words) [view diff] exact match in snippet view article find links to article

grains. Using a fluid bromide tracer, Dicke (in Graf 1992) found molecular diffusion alone to penetrate soft sediments to 4 cm in one day and 8 cm after