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Diffusion coefficient through the pore space of a porous media
The effective diffusion coefficient of a diffusant (atoms of a material which are diffusing in another material) in atomic diffusion of solid polycrystalline
Effective diffusion coefficient
Effective_diffusion_coefficient
Proportionality constant in some physical laws
diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion and the negative
Mass_diffusivity
Diffusion coefficient of a diffusant along a grain boundary
The grain boundary diffusion coefficient is the diffusion coefficient of a diffusant along a grain boundary in a polycrystalline solid. It is a physical
Grain boundary diffusion coefficient
Grain_boundary_diffusion_coefficient
Net transport of atoms through a solid
activation energy for diffusion. Atomic diffusion in polycrystalline materials is therefore often modeled using an effective diffusion coefficient, which is a combination
Atomic_diffusion
Mathematical descriptions of molecular diffusion
solve for the diffusion coefficient, D. Fick's first law can be used to derive his second law, which in turn is identical to the diffusion equation. Fick's
Fick's_laws_of_diffusion
Transport of dissolved species from the highest to the lowest concentration region
are used in two different scenarios ( D {\displaystyle D} is the diffusion coefficient, having dimensions area / time): Brownian motion of an impulsive
Diffusion
Technique for the generative modeling of a continuous probability distribution
In machine learning, diffusion models, also known as diffusion-based generative models or score-based generative models, are a class of latent variable
Diffusion_model
Rate constant in engineering
In engineering, the mass transfer coefficient is a diffusion rate constant that relates the mass transfer rate, mass transfer area, and concentration change
Mass_transfer_coefficient
Microscopic processes responsible for changes in a material's structure, shape and volume
effective diffusion coefficient in the strain rate equation depends on whether or not the system is dominated by core diffusion or lattice diffusion and
Deformation_mechanism
Gradual destruction of materials by chemical reaction with its environment
{D_{i}}{\pi t}}}} , where t is time, Di is the ith cation effective diffusion coefficient (cm2/d), which depends on pH of contacting water as Di = Di0·10–pH
Corrosion
Diffusion process with a non-linear relationship to time
the diffusion coefficient). It has been found that equations describing normal diffusion are not capable of characterizing some complex diffusion processes
Anomalous_diffusion
Range of wavelengths from 650 to 1350 nanometre
absorption (black) and the effective attenuation (magenta) coefficient spectra, as shown in Figure 6 (a). 'cite: Anisotropic diffusion filter for dorsal hand
Near-infrared window in biological tissue
Near-infrared_window_in_biological_tissue
Theory on how and why new ideas spread
Diffusion of innovations is a theory that seeks to explain how, why, and at what rate new ideas and technology spread. The theory was popularized by Everett
Diffusion_of_innovations
Equation characterising electrochemical kinetics
}}c^{*}} where: Deff is the effective diffusion coefficient (taking tortuosity into account, if any); δ is the diffusion layer thickness; c* is the concentration
Butler–Volmer_equation
Image noise reducing technique
can be described by a generalization of the usual diffusion equation where the diffusion coefficient, instead of being a constant scalar, is a function
Anisotropic_diffusion
Type of microbiology test
The disk diffusion test (also known as the agar diffusion test, Kirby–Bauer test, disc-diffusion antibiotic susceptibility test, disc-diffusion antibiotic
Disk_diffusion_test
Physical phenomenon
machines has led to the neoclassical diffusion concept. Bohm diffusion is characterized by a diffusion coefficient equal to D Bohm = 1 16 k B T e B , {\displaystyle
Bohm_diffusion
Particle behavior in systems of length less than the mean free path
molecule itself. The diffusivity for Knudsen diffusion is obtained from the self-diffusion coefficient derived from the kinetic theory of gases: D A
Knudsen_diffusion
{1}{3(\mu _{a}+\mu _{s}')}}} is the diffusion coefficient and μ′s = (1−g) μs is the reduced scattering coefficient. Notably, there is no explicit dependence
Radiative transfer equation and diffusion theory for photon transport in biological tissue
Radiative_transfer_equation_and_diffusion_theory_for_photon_transport_in_biological_tissue
Relationship describing the kinetics of intermolecular photochemical deactivation
the limiting factor, and almost all such collisions are effective), the quenching rate coefficient is given by k q = 8 R T / 3 η {\displaystyle k_{q}={8RT}/{3\eta
Stern–Volmer_relationship
Main parameter determining concrete strength and durability
increases the hydraulic conductivity (K, m/s) of concrete and the effective diffusion coefficients (De, m2/s) of solutes and dissolved gases in the concrete matrix
Water–cement_ratio
Key morphogen in fruit fly development
affected by biological parameters: The effective diffusion coefficient, which is dependent on extracellular diffusion, intracellular transport rates, and
Decapentaplegic
Solid-state welding technique
first law of diffusion states: J = − D ( d C / d x ) , {\displaystyle J=-D(dC/dx),} where J is the diffusion flux, D is a diffusion coefficient, and dC/dx
Diffusion_bonding
Optimization algorithm
where D = s 2 / 2 τ {\displaystyle D=s^{2}/2\tau } is the effective diffusion coefficient. Here s {\displaystyle s} is the step size or distance traveled
Cuckoo_search
Differential diffusion
the higher diffusion coefficient will be larger, so there will be a net flux of atoms from the material with the higher diffusion coefficient into the material
Kirkendall_effect
Protein-coding gene in the species Drosophila melanogaster
retention as a size-dependent regulator of Bicoid protein's effective diffusion coefficient, and scaling of cytoplasmic streaming. Maternal effect Little
Homeotic_protein_bicoid
Similarity measure for number sequences
Other names for cosine similarity include Orchini similarity and Tucker coefficient of congruence; the Otsuka–Ochiai similarity (see below) is cosine similarity
Cosine_similarity
Effective diffusion of a substance enhanced by shear flow, studied in fluid dynamics
Taylor dispersion or Taylor diffusion is an apparent or effective diffusion of some scalar field arising on the large scale due to the presence of a strong
Taylor_dispersion
Water vapor used in industrial processes
growth rate of the oxide layer is directly related to the effective diffusion coefficient of the water molecules into the oxide layer and the equilibrium
Ultra-high-purity steam for oxidation and annealing
Ultra-high-purity_steam_for_oxidation_and_annealing
Mixing of fluids due to eddy currents
In fluid dynamics, eddy diffusion, eddy dispersion, or turbulent diffusion is a process by which fluid substances mix together due to eddy motion. These
Eddy_diffusion
to prevent or to retard the inter-diffusion of the two superposed metals. Therefore, to be effective, a good diffusion barrier requires inertness with respect
Diffusion_barrier
Resistance of a fluid to shear deformation
"Revised Enskog theory for Mie fluids: Prediction of diffusion coefficients, thermal diffusion coefficients, viscosities, and thermal conductivities". The Journal
Viscosity
Parameter of solute diffusion
multiples of electron charges. In 1905, Albert Einstein found the diffusion coefficient D {\displaystyle D} of an ion to be proportional to its mobility
Stokes_radius
interdiffusion, hence most models of ion mixing involve an effective diffusion coefficient that is used to characterize thickness of the reacted layer
Ion_beam_mixing
Experimental technique in cell biology
curve can yield kinetic coefficients, such as those for the protein's binding reactions and/or the protein's diffusion coefficient in the medium where it
Fluorescence recovery after photobleaching
Fluorescence_recovery_after_photobleaching
Flaw in mathematical modelling
phenomenon sometimes known as shrinkage). In particular, the value of the coefficient of determination will shrink relative to the original data. To lessen
Overfitting
Medical imaging and optical technique
reasonably well approximated as an "effective" Brownian motion, i.e., DB represents the effective diffusion coefficient of the moving scatterers. In order
Diffuse correlation spectrometry
Diffuse_correlation_spectrometry
Geochemical dating method
diffusion curves, and D s , e f f {\displaystyle Ds,eff} is an effective diffusion coefficient (eq. 3) which relates the inverse gradient of the fit polynomial
Obsidian_hydration_dating
Process of removing noise from a signal
the heat equation, which is called anisotropic diffusion. With a spatially constant diffusion coefficient, this is equivalent to the heat equation or linear
Noise_reduction
{\displaystyle \rho } is density, Γ {\displaystyle \Gamma } is the diffusion coefficient, u {\displaystyle \mathbf {u} } is the velocity vector, ϕ {\displaystyle
Upwind differencing scheme for convection
Upwind_differencing_scheme_for_convection
Concept in computational fluid dynamics
x}}\Gamma {\frac {\partial \phi }{\partial x}}} In the above equation Diffusion Coefficient, Γ {\displaystyle \Gamma } and both the density ρ {\displaystyle
Power_law_scheme
Process by which soils decrease in volume
changes volume slowly at constant effective stress over a longer time-scale than consolidation due to the diffusion of water. To distinguish between the
Soil_consolidation
Process by which heat is transferred within an object
Thermal conduction is the diffusion of thermal energy (heat) within one material or between materials in contact. The higher temperature object has molecules
Thermal_conduction
Separation technique to characterize the size of colloidal particles
FFF method, the property driving separation is the translational diffusion coefficient or the hydrodynamic size. For a thermal field (heating one wall
Field_flow_fractionation
Materials engineered to have properties that have not yet been found in nature
tailored effective density and bulk modulus. The third branch encompasses thermal metamaterials, which manipulate heat conduction and diffusion. These are
Metamaterial
Intentional introduction of impurities into an intrinsic semiconductor
has a small diffusion coefficient. Used for buried layers. Has diffusivity similar to arsenic, is used as its alternative. Its diffusion is virtually
Doping_(semiconductor)
Region of a star
T^{4}} Finally, as in the elementary theory of diffusion coefficient in gases, the diffusion coefficient D approximately satisfies: D = 1 3 c λ {\displaystyle
Radiative_zone
_{\mathrm {bulk} }}}} , where D {\displaystyle D} is the diffusion coefficient. The diffusion length is independent of any built-in fields in contrast
Surface_photovoltage
Ability of charged particles to move through a medium in response to an electric field
D} is the diffusion coefficient. If one defines the mean free path in terms of momentum transfer, then one gets for the diffusion coefficient D = π 8 λ
Electrical_mobility
of random motion, trajectory analysis can be used to measure the diffusion coefficient. In life sciences, single-particle tracking is broadly used to quantify
Single-particle_tracking
Overview of and topical guide to machine learning
Constructing skill trees Decision tree learning Dehaene–Changeux model Diffusion map Dominance-based rough set approach Dynamic time warping Error-driven
Outline_of_machine_learning
Type of statistical analysis
known, FCS can be used to obtain quantitative information such as diffusion coefficients hydrodynamic radii average concentrations kinetic chemical reaction
Fluorescence correlation spectroscopy
Fluorescence_correlation_spectroscopy
climate Effective action Effective atomic number (compounds and mixtures) Effective diffusion coefficient Effective dose (radiation) Effective field theory
Index_of_physics_articles_(E)
Non-uniformity of a diffusion process
to evaluate the anisotropy in diffusion. They can also be easily calculated by using the Spherical Harmonic coefficients of the ODF model. Basser, P.J
Fractional_anisotropy
Medical imaging technique
(May 2011). "Signal evolution and infarction risk for apparent diffusion coefficient lesions in acute ischemic stroke are both time- and perfusion-dependent"
Physics of magnetic resonance imaging
Physics_of_magnetic_resonance_imaging
Metallurgical equation
diffusion occurs in the liquid at all temperatures by virtue of a high diffusion coefficient, thermal convection, Marangoni convection, etc. ( D L = ∞ {\displaystyle
Scheil_equation
Property of solid materials under mechanical stress
the diffusion coefficient of atoms along the grain boundary, Q = Q(grain boundary diffusion), m = 1, and b = 3. Because Q(grain boundary diffusion) is
Creep_(deformation)
CBL, and that the magnitude of mixing is determined by the eddy diffusion coefficient K c {\displaystyle K_{c}} and local gradients of corresponding scalars
Convective planetary boundary layer
Convective_planetary_boundary_layer
Equation for sedimentation under centrifugation
and the parameters D, s, and ω represent the solute diffusion constant, sedimentation coefficient and the rotor angular velocity, respectively. The first
Lamm_equation
Technique for determining size distribution of particles
is related to the motion of the particles, specifically to the diffusion coefficient. To fit the decay (i.e., the autocorrelation function), numerical
Dynamic_light_scattering
Process of calculating the causal factors that produced a set of observations
eigenvalues (energies) counting function n(x). The goal is to recover the diffusion coefficient in the parabolic partial differential equation that models single
Inverse_problem
Ratio of void volume and total volume of a porous material
soil (before its burial), and k {\displaystyle k} is the compaction coefficient (m−1). The letter e {\displaystyle e} with a negative exponent denotes
Porosity
Medical imaging technique
(May 2011). "Signal evolution and infarction risk for apparent diffusion coefficient lesions in acute ischemic stroke are both time- and perfusion-dependent"
Magnetic_resonance_imaging
Machine learning technique
November 2023). "DPOK: Reinforcement Learning for Fine-tuning Text-to-Image Diffusion Models". NeurIPS 2023. arXiv:2305.16381. Retrieved 1 March 2024. Xu, Jiazheng;
Reinforcement learning from human feedback
Reinforcement_learning_from_human_feedback
R}^{2}}{8D_{GR}}}} where D G R {\displaystyle \ D_{GR}} is the diffusion coefficient of the doubly fluorescent particle. The cross-correlation curve
Fluorescence cross-correlation spectroscopy
Fluorescence_cross-correlation_spectroscopy
Pulse sequence during a medical test
(May 2011). "Signal evolution and infarction risk for apparent diffusion coefficient lesions in acute ischemic stroke are both time- and perfusion-dependent"
MRI_pulse_sequence
Mechanism of spontaneous phase separation
modulation in an initially homogeneous alloy implies uphill diffusion or a negative diffusion coefficient. Becker and Dehlinger had already predicted a negative
Spinodal_decomposition
Quantity in solid-state physics
is the diffusion coefficient or diffusivity ∇ n {\displaystyle \nabla n} is the concentration gradient of electrons The diffusion coefficient for a charge
Electron_mobility
Binder used as basic ingredient of concrete
diffusion properties. Direct measurement of the radon diffusion coefficient in cement is complex, but it can be estimated from the oxygen diffusion coefficient
Portland_cement
Route of drug administration
skin diffusion coefficient formulated by Michaels. This formulation suggests how they related to the aqueous solubility and partition coefficient in skin
Topical_drug_delivery
American theoretical scientist
stealthy disordered two-phase systems can attain nearly maximal effective diffusion coefficients over a broad range of volume fractions while also maintaining
Salvatore_Torquato
Medication applied to body surfaces
x {\displaystyle J=-D{dc \over dx}} where J is the diffusion flux. D is the diffusion coefficient. dc/dx is the concentration gradient. For D is described
Topical_medication
Analytical method in electrochemistry
analyte in mol/cm3; D is the diffusion coefficient for species in cm2/s; t is the time in seconds. Under controlled-diffusion circumstances, the current-time
Chronoamperometry
Pulmonary function test
of similar age, sex and body composition. A derived parameter is the coefficient of retraction (CR) which is Pmax/TLC . Mean transit time (MTT) Mean transit
Spirometry
Form of exhaust heat management
oxygen, so that further growth is controlled by diffusion of metal from the bond-coat rather than the diffusion of oxygen from the top-coat. The TBC can also
Thermal_barrier_coating
Medical doctor, physicist, member of the Institut de France
Masakazu; Sakashita, Hiromi; Togashi, Kaori (2011). "Apparent Diffusion Coefficient as an MR Imaging Biomarker of Low-Risk Ductal Carcinoma in Situ:
Denis_Le_Bihan
Technology for splitting specific gases out of mixtures
lower diffusion coefficient. The polymer chain flexibility and free volume in the polymer of the membrane material influence the diffusion coefficient, as
Membrane_gas_separation
Study of motions and interactions of neutrons
the diffusion coefficient. The equation for the precursors of delayed neutrons and all other notations are defined above. The multigroup diffusion equation
Neutron_transport
Movement of ions in an electrical field
H-E_{A}}{kT}}\right)} where E A {\displaystyle E_{A}} is the effective activation energy of the thermal diffusion of metal atoms. The vacancy concentration represents
Electromigration
Transportation of solutes through membranes
structure makes transport possible by simple or passive diffusion, which consists of the diffusion of substances through the membrane without expending metabolic
Membrane_transport
Substance-specific relation between two physical quantities
at a point of contact between two interfaces through a dimensionless coefficient of friction μf, which depends on the pair of materials: F f = μ f R
Constitutive_equation
Binary elastic collision between two charged particles
but the transport coefficients depend only logarithmically thereon; both results agree and yield the above expression for the diffusion constant. Rutherford
Coulomb_collision
Speed at which a chemical reaction takes place
{dC_{i}}{dt}}+C_{i}{\frac {dV}{dt}}\right),} where νi is the stoichiometric coefficient for substance i (equal to a, b, p, and q in the typical reaction above)
Reaction_rate
Energy transfer in the form of electromagnetic radiation
the massive particles. For a medium in LTE, the emission coefficient and absorption coefficient are functions of temperature and density only, and are related
Radiative_transfer
Equation in stellar astrophysics
reduced Planck constant. As in the theory of diffusion coefficient in gases, the diffusion coefficient D approximately satisfies: D = 1 3 c λ {\displaystyle
Mass–luminosity_relation
Movement of entangled polymer chains
of dynamic phase transition. Due to the reptation motion the coefficient of self-diffusion and conformational relaxation times of macromolecules depend
Reptation
Alloy
temperature. The measured coefficient of thermal expansion is 5.66×10−6 K−1. This is significantly larger than the coefficient for InP which is 4.56×10−6 K−1
Indium_gallium_arsenide
Reactor that operates on a continuous flow of inputs
the heat liberated or absorbed by the process (W) U: the heat transfer coefficient of the heat exchanger (W/(m2K)) A: the heat transfer area (m2) Tp: process
Continuous_reactor
Machine learning technique
)} is mean-squared error (MSE) the coefficients γ j m {\displaystyle \gamma _{jm}} coincide with the coefficients of the tree-fitting procedure b j m
Gradient_boosting
Strong permanent magnet made from an alloy of a rare-earth element and cobalt
These samarium–cobalt magnets generally have a reversible temperature coefficient of -0.05%/°C. Saturation magnetization can be achieved with a moderate
Samarium–cobalt_magnet
Transport of substances between two fractions with the help of permeable membranes
especially during ultra-filtration. In the solution-diffusion model, transport occurs only by diffusion. The component that needs to be transported must
Membrane_technology
Study of material structure and properties
(a) effective refractive indexes and (b) absorption coefficients of integrated circuits obtained via terahertz spectroscopy
Characterization (materials science)
Characterization_(materials_science)
Type of machine learning model
comparable performance to OpenAI's o1 while being significantly more cost-effective to operate. Unlike proprietary models from OpenAI, DeepSeek-R1's open-weight
Large_language_model
Route by which substances can enter the body through the skin
the body. Toxins and toxicants can move through the layers by passive diffusion. The stratum corneum is the outermost layer of the epidermis and the rate-limiting
Absorption_(skin)
Class of semiconductor nanocrystals
carrier mobility, long carrier lifetimes, long carrier diffusion lengths, and small effective carrier masses. Unlike their nanocrystal counterparts, bulk
Perovskite_nanocrystal
Concept of uniform or non-uniform in an object's composition or attributes
made homogeneous by melting, stirring, or by allowing time to pass for diffusion to distribute the molecules evenly. For example, adding dye to water will
Homogeneity_and_heterogeneity
Technique used for wastewater treatment
assess whether the electrochemical process is in diffusion control or not. If the mass transfer coefficient for the system is known, the limiting current
Electro-oxidation
medias). The observed effective diffusion tensor is not necessarily isotropic and can be state-dependent, whereas the friction coefficient γ {\displaystyle
Single-particle_trajectory
Movement of a drug into the bloodstream or lymph
concentration of the solid in the diffusion layer surrounding the solid. D is the diffusion coefficient. L is the diffusion layer thickness. As can be inferred
Absorption_(pharmacology)
Law about the rate of chemical reactions
)(q-\xi )={\frac {k'}{k}}(p'+\xi )(q'+\xi )} The ratio of the affinity coefficients, k'/k, can be recognized as an equilibrium constant. Turning to the kinetic
Law_of_mass_action
EFFECTIVE DIFFUSION-COEFFICIENT
EFFECTIVE DIFFUSION-COEFFICIENT
Boy/Male
Hindu
Form of God, Effective
Boy/Male
Indian, Punjabi, Sikh, Tamil, Telugu
Light of King; Effective King; Light of Day
Boy/Male
Indian, Punjabi, Sikh
One who is Aware and Reflective
Boy/Male
Hindu, Indian, Marathi
Effective; Powerful
Boy/Male
Indian, Telugu
Radiance; Diffusing Light
Boy/Male
Muslim Hindi
Worker. Effective.
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Effective; Efficient; Goddess Durga
Biblical
effusion of blood
Boy/Male
Arabic, Indian, Muslim, Sindhi
Doer; Work Man; Worker; Effective
Biblical
effusion; inclination; theft
Boy/Male
Muslim
Worker. Effective.
Boy/Male
Hindu, Indian
Effective
Boy/Male
Tamil
Form of God, Effective
Boy/Male
Indian, Sanskrit
Not Defective; Healthy; Whole
Boy/Male
Biblical
Diffusion; inclination; theft.
Girl/Female
Biblical
Effusion of blood.
Girl/Female
Sikh
Form of God, Effective
Boy/Male
Anglo, Australian, Hindu, Indian, Kurdish, Punjabi, Sikh
Pain; Effective
Boy/Male
Biblical
Diffusion; inclination; theft.
Boy/Male
Indian, Sanskrit
The Spring Season; Effecting Wishes
EFFECTIVE DIFFUSION-COEFFICIENT
EFFECTIVE DIFFUSION-COEFFICIENT
Boy/Male
Indian, Punjabi, Sikh
One whose Actions are Holy
Male
Arthurian
, (lordly); brother of Gildas.
Boy/Male
Hindu, Indian
Flower
Girl/Female
Arabic
Beautiful
Surname or Lastname
English
English : habitational name from a place in Derbyshire recorded in Domesday Book as Bunteshale ‘nook or corner of land (Old English halh) of a man called Bunt’.
Girl/Female
Hindu, Indian, Traditional
Full of Love
Male
Finnish
Finnish form of Hebrew Reuwben, RUUPENI means "behold, a son."Â
Boy/Male
Arabic
Water; Adjust Everywhere; Pond
Girl/Female
Egyptian
Wanted.
Girl/Female
Arabic, Muslim
Name of a Mountain in Madina
EFFECTIVE DIFFUSION-COEFFICIENT
EFFECTIVE DIFFUSION-COEFFICIENT
EFFECTIVE DIFFUSION-COEFFICIENT
EFFECTIVE DIFFUSION-COEFFICIENT
EFFECTIVE DIFFUSION-COEFFICIENT
a.
Throwing back images; as, a reflective mirror.
n.
The act of pouring out; as, effusion of water, of blood, of grace, of words, and the like.
a.
Not effective; ineffectual; futile; inefficient; useless; as, an ineffective appeal.
a.
Dependent on choice; bestowed or passing by election; as, an elective study; an elective office.
a.
Addicted to introspective or meditative habits; as, a reflective person.
a.
Having the quality of diffusing; capable of spreading every way by flowing; spreading widely; widely reaching; copious; diffuse.
a.
Effective.
superl.
Vigorous; effective; forcible; powerful.
n.
The act of passing by osmosis through animal membranes, as in the distribution of poisons, gases, etc., through the body. Unlike absorption, diffusion may go on after death, that is, after the blood ceases to circulate.
a.
Incapable of, or indisposed to, effective action; habitually slack or remiss; effecting little or nothing; as, inefficient workmen; an inefficient administrator.
n.
Direct, forcible, and effective speaking.
a.
Capable of exercising thought or judgment; as, reflective reason.
a.
Exerting the power of choice; selecting; as, an elective act.
a.
Having the power to produce an effect or effects; producing a decided or decisive effect; efficient; serviceable; operative; as, an effective force, remedy, speech; the effective men in a regiment.
a.
Having power to diffuse itself; diffusing itself.
v. t.
The act of infusing, pouring in, or instilling; instillation; as, the infusion of good principles into the mind; the infusion of ardor or zeal.
a.
Lacking some of the usual forms of declension or conjugation; as, a defective noun or verb.
n.
The act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion.
a.
Wanting in something; incomplete; lacking a part; deficient; imperfect; faulty; -- applied either to natural or moral qualities; as, a defective limb; defective timber; a defective copy or account; a defective character; defective rules.
a.
Not effective.