noun
definition
The conveying of heat or electricity through material.
definition
The act of leading or guiding.
definition
The act of training up.
Examples of conduction in a Sentence
Here we have an instance of the conduction of heat.
His most important work was concerned with the conduction of heat and with spectroscopy.
This will be composed of a conduction and a convection current, the latter due to rising or falling air currents carrying ions.
This method of communication by magnetic induction through space establishes, therefore, a second method of wireless telegraphy which is quite independent of and different from that due to conduction through earth or water.
The mathematical theory of conduction of heat was developed early in the 19th century by Fourier and other workers, and was brought to so high a pitch of excellence that little has remained for later writers to add to this department of the subject.
In the stalk of the sporogonium there is a similar strand, which is of course not in direct connection with, but continues the conduction of water from, the strand of the gametophytic axis.
Among other subjects at which he subsequently worked were the absorption of gases in blood (1837-1845), the expansion of gases by heat (1841-1844), the vapour pressures of water and various solutions (1844-1854), thermo-electricity (1851), electrolysis (1856), induction of currents (1858-1861), conduction of heat in gases (1860), and polarization of heat (1866-1868).
The special properties of these solutions are dealt with under Electrolysis and Electric conduction, § In Liquids.
The heat per second gained by conduction by an element dx of the bar, of conductivity k and cross section q, at a point where the gradient is dB/dx, may be written gk(d 2 6/dx 2)dx.
The fact that conduction occurred preponderantly in certain directions was explained by appeal to a hypothetical resistance to conduction which, for reasons unascertained, lay less in some directions than in others.
The phenomena attendant on the passage of electricity through solids, through liquids and through gases, are described in the article Electric conduction, and also Electrolysis, and the propagation of electrical vibrations in Electric Waves.
Preece, who took up the subject about the same time as Prof. Trowbridge, obtained improved practical results by combining together methods of induction and conduction.
In all cases, while the internal threads which bear the cortical branches consist of elongated cells with few chromatophores, and no doubt serve mainly for conduction of food substances, the superficial cells of the branches themselves are packed with chromatophores and form the chief assimilating tissue of the plant.
That is to say, instead of using Boyle's law, which supposes that the pressure changes so exceedingly slowly that conduction keeps the temperature constant, we must use the adiabatic relation p = kpy, whence d p /d p = y k p Y 1= yp/p, and U = (yp/p) [Laplace's formula].
Graham showed that the diffusion was approximately proportional to the difference in concentration, and on these lines a theory of diffusion was founded on the lines of Fourier's treatment of the conduction of heat.
In measuring conduction of heat in fluids, it is possible to some extent to eliminate the effects of molar convection or mixing, but it would not be possible to distinguish between diffusion, or internal radiation, and conduction.
Weber's hypothesis of electric atoms, capable of diffusing through metallic bodies and conductors of electricity, but capable of vibration only in non-conductors, it is possible that the ultimate mechanism of conduction may be reduced in all cases to that of diffusion in metallic bodies or internal radiation in dielectrics.
Both in muscle and in nerve this spread is termed conduction.
One of the earliest was devoted to electrical conduction in a thin plate, and especially in a circular one, and it also contained a theorem which enables the distribution of currents in a network of conductors to be ascertained.
These subjects are discussed in the articles Density; Thermometry; Calorimetry; Diffusion; Conduction Of Heat; and Condensation Of Gases.
Beneath these layers are masses of salter water, through which a thermal wave of small amplitude is slowly propagated to the bottom by conduction.
This is in fair agreement with the computed temperature due to the sun's radiation upon a perpendicular absorbing surface when no temperature is lost through conduction to the interior.
Fourier for the propagation of heat; and if, in Fourier's solution of any problem of heat-conduction, we change the word "temperature" to "potential" and write "electric current" instead of "flux of heat," we have the solution of a corresponding problem of electric conduction.
A group of bodies may, however, be yet discovered between alloys and electrolytes in which evidence may be found of some gradual change from wholly metallic to electrolytic conduction.
In fact, for a considerable period, the term " theory of heat " was practically synonymous with the mathematical treatment of a conduction.
This continuum was held to render possible conduction in all directions throughout the grey matter of the whole nervous system.
Although the cell body or perikaryon of the neuron, with its contained nucleus, is essential for the maintenance of the life of the cell branches, it has become recognized that the actual process and function of "conduction" in many neurons can, and does, go on without the cell body being directly concerned in the conduction.
Another discussed conduction in curved sheets; a third the distribution of electricity in two influencing spheres; a fourth the deter mination of the constant on which depends the intensity of induced currents; while others were devoted to Ohm's law, the motion of electricity in submarine cables, induced magnetism, &c. In other papers, again, various miscellaneous topics were treated - the thermal conductivity of iron, crystalline reflection and refraction, certain propositions in the thermodynamics of solution and vaporization, &c. An important part of his work was contained in his Vorlesungen fiber mathematische Physik (1876), in which the principles of dynamics, as well as various special problems, were treated in a somewhat novel and original manner.
He also determined the effect of change of temperature distribution on the rate of generation of heat by the current; and on the external loss of heat by radiation, convection and conduction.
In Thomson's theory it is expressly assumed that the reversible thermal effects may be considered separately without reference to conduction.
It is assumed that a flow of heat Q, due to conduction, tends to carry with it a proportional electric current C = aQ.
It is difficult to see how this complication can be avoided, unless the first postulate is abandoned, and the heat-flow due to conduction is assumed to be independent of the thermoelectric phenomena.
It simplifies the theory, and gives a possible relation between the constants, but it does not appear to remove the complication above referred to, which seems to be inseparable from any conduction theory.
Neglecting" conduction, all the expressions which he gives are equivalent to the equations of Thomson.
Taking conduction into account in the application of the second law of thermodynamics, he proposes to substitute the inequality, Td/dET - P
Others have considered conduction in a metal to be analogous to electrolytic conduction, and the observed effects to be due to " migration of the ions."
Thomson's calculations on the conduction of heat showed that at some time between twenty millions and four hundred millions, probably about one hundred millions, of years ago, the physical conditions of the earth must have been entirely different from those which now obtain.
Digoxin also acts indirectly by increasing parasympathetic activity via the vagus nerve, further slowing atrioventricular node conduction.
Material contact would allow conduction, thus eliminating the reflective insulation effect.
Recent technological advances have refined the ability of pacemakers to mimic physiological cardiac conduction.
H Understand how bonding in metals can be used to explain electrical conduction.
Asked how nerve conduction studies work at which point bell went thank goodness.
This same extended network also supports proton conduction, a flow of positive electricity that occurs much faster than the diffusion of ions.
In order for the channel to respond to the appropriate ligand they have specific regulatory domains attached to the ion conduction pathway.
Local anesthetic agents may be administered intradermally or subcutaneously to block impulse conduction in local nerve fibers.
Who is a bone conduction hearing aid suitable for?
Measurements of such order are usually made by diffraction techniques, which detect the ionic cores and the spins of the conduction electrons.
A typical example would be heat conduction through a bolted flange.
However, the term also covers nerve conduction studies - testing the electrical function of nerve conduction studies - testing the electrical function of nerves in the limbs.
Similar nerve conduction results Studies show a " mild background demyelinating neuropathy " .