CO OZNACZA SŁOWO DIFFUSION COEFFICIENT
Dyfuzja masy
Współczynnik dyfuzji lub dyfuzji jest stałą proporcjonalną pomiędzy strumieniem molowym w wyniku dyfuzji cząsteczkowej i gradientem w stężeniu gatunkowym. Dyfuzję napotykamy w prawie Ficka i na wielu innych równaniach chemii fizycznej. Dyfuzja jest ogólnie przepisywana dla danej pary gatunków i parzysta dla systemu wielorasowego. Im wyższa dyfuzja, tym szybciej rozpraszają się. Zwykle współczynnik dyfuzji związku ~ 10 000x jest tak duży w powietrzu jak w wodzie. Dwutlenek węgla w powietrzu ma współczynnik dyfuzji 16 mm2 / s, aw wodzie jego współczynnik dyfuzji wynosi 0,0016 mm2 / s. Dyfuzja ma jednostkę SI m2 / s. W jednostkach CGS podawane są w cm2 / s.
Definicja słowa diffusion coefficient w słowniku
Definicja współczynnika dyfuzji w słowniku to szybkość, z jaką substancja dyfuzyjna jest transportowana pomiędzy przeciwległymi powierzchniami sześcianu jednostkowego układu, gdy istnieje różnica między jednostkami stężeń D Zwana również: dyfuzyjnością.
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1
Encyclopedia of Soil Science
As we have seen above, it is possible to calculate the diffusion coefficient of a
species, which exists in more than one form. In this section we shall discuss the
effect of soil parameters on the effective diffusion coefficient and introduce the ...
2
Diffusion: Mass Transfer in Fluid Systems
where D is the actual diffusion coefficient; and E is a dispersion coefficient
caused by the wind. In the smoke-stack case, the diffusion term in this equation
must be small relative to the dispersion term. However, the mass balance will
have the ...
3
Diffusion in Solids: Fundamentals, Methods, Materials, ...
Charge diffusion coefficient: In the solid-state diffusion literature Eq. (11.22) is
often used to calculate another 'diffusion coefficient' called the charge diffusion
coefficient (sometimes denoted also as the conductivity diffusion coefficient or the
...
4
Estimation of Eugenol
Diffusion Coefficient in LLDPE Using ...
ABSTRACT ESTIMATION OF EUGENOL DIFFUSION COEFFICIENT IN LLDPE
USING FTIR- ATR FLOW CELL AND HPLC TECHNIQUES By Gaurav Dhoot A
time-resolved Fourier transform infrared-attenuated total reflectance
spectroscopy ...
5
The Practical Handbook of Compost Engineering
The diffusion coefficient is an important parameter in mass transport. It
determines the rate at which substrate materials diffuse into the matrix and the
rate at which metabolized end products diffuse out of that matrix. Flow conditions
within a ...
6
Principles and Applications of Chemical Defects
Table 2.1 Symbols and terms for diffusion coefficients Symbol Meaning
Applicability D Self-diffusion coefficient Random diffusion processes in the
absence of a concentration gradient D' Tracer diffusion coefficient Diffusion when
concentration ...
Richard J.D. Tilley,
1998
7
Applied Flow and Solute Transport Modeling in Aquifers: ...
D* is the ionic or effective molecular diffusion coefficient of the porous medium
and s the distance. ... is comparatively lower than the molecular diffusion
coefficient in pure water D0 or diffusion coefficient in aqueous solution: D* = D0T,
0<r<1.0 ...
8
Diffusion of Chloride in Concrete: Theory and Application
where C is the chloride content at the locality x at time t, and D is the chloride
diffusion coefficient which may depend on the time t, the locality x, the chloride
content C, and the composition and environment of the concrete. It is, however,
an ...
E. Poulsen, L. Mejlbro,
2010
9
Intrinsic Point Defects, Impurities, and Their
Diffusion in ...
4.15 Concentration dependence of the diffusion coefficient of tin 310 5.1
Concentration dependence of the formation of impurity clusters 333 5.2 Effects of
ion pairing on the diffusivity of dopants in iso-concentration experiments 335 5.3
Effects ...
10
Diffusion-Weighted MR Imaging: Applications in the Body
... scale of molecular displacement over a given interval for a simple self-diffusion
system. Consider, for example, pure water at body temperature (37°C) which is
known to have a self-diffusion coefficient of approximately D = 3 × 10−3mm2/s.
Dow-Mu Koh, Harriet C. Thoeny,
2010
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «DIFFUSION COEFFICIENT»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
diffusion coefficient w wiadomościach.
Advances in modelling tumour growth - MedicalPhysicsWeb
Apparent diffusion coefficient values derived from the MR images were used to estimate sets of model parameters. They then used the model to ... «Medical Physics Web, Lip 15»
Characterizing Viruses and Viral Vaccines with Nanoparticle …
From this value, the particle diffusion coefficient (Dt) can be determined. Using Dt, the sphere-equivalent hydrodynamic diameter (d) of the ... «AZoNano.com, Lip 15»
The Three-Dimensional Morphology of Growing Dendrites
The tip radius can be estimated using the marginal stability criterion with literature values of capillary length, diffusion coefficient, and the ... «Nature.com, Lip 15»
Using Nanoparticle Tracking Analysis (NTA) to Assess Nanoparticle …
Based on this value, the particle diffusion coefficient (Dt) can be determined. Further, using the Stokes-Einstein equation as given below, the ... «AZoNano.com, Lip 15»
Taylor Dispersion Analysis (TDA) Introduction and Overview
From the diffusion coefficient values, hydrodynamic radii of the molecules can be determined. Taylor described the TDA method for the first time ... «Azom.com, Lip 15»
Insight into how pharmaceutical solvents diffuse through a human nail
Based on calculations using experimental results, this behavior is characteristic of a time- and concentration-dependent diffusion coefficient. «Phys.Org, Cze 15»
Translational diffusion coefficient of wormlike regular three-arm stars
Effects of chain stiffness on the translational diffusion coefficient D or (effective) hydrodynamic radius RH (∝ D−1) are examined theoretically ... «Nature.com, Cze 15»
A literature review of the association between diffusion-weighted …
A literature review of the association between diffusion-weighted MRI derived apparent diffusion coefficient and tumour aggressiveness in ... «UroToday, Cze 15»
Ultra-small, size-controlled Ni(OH) 2 nanoparticles: elucidating the …
(c) Diffusion coefficient values of Ni(OH)2 nanoparticles with different sizes. (d) Model depicting the relationship between the impact factors and ... «Nature.com, Cze 15»
Dynamic Vapor Sorption and its Applications
It is possible to measure the water vapor diffusion coefficient and also its activation energy of diffusion into a pharmaceutical powder by ... «Azom.com, Maj 15»