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sign and convention
The Hankel functions are used to express outward-and inward-propagating cylindrical wave solutions of the cylindrical wave equation, respectively ( or vice versa, depending on the sign convention for the frequency ).
( The convention of a negative sign in the exponent is often convenient because it means that is the amplitude of a " positive frequency ",.
The exactly opposite properties of the two kinds of electrification justify our indicating them by opposite signs, but the application of the positive sign to one rather than to the other kind must be considered as a matter of arbitrary convention, just as it is a matter of convention in mathematical diagram to reckon positive distances towards the right hand.
These take several different forms, depending on the choice of formalism and sign convention used.
Passed a white granite entrance with signs announcing a convention of electronic engineers, and turned in hoping to find coffee, and a demo of hi-fi advances, and found a deserted desk, with signs announcing that one must sign in with name, industry and invitation number.
The transcription of the syllable ( it may not have been pronounced that way ) is listed next to the sign along with Bennett's identifying number for the sign preceded by an asterisk ( as was Ventris ' and Chadwick's convention ).
where the negative sign is given, by convention, to indicate an upright object for positive values and an inverted object for negative values.
On 8 July 2005 Canada became the only non European state to sign the convention.
The moment direction may be accounted for by using a stated sign convention, such as a plus sign (+) for counterclockwise moments and a minus sign (-) for clockwise moments, or vice versa.
The iconicity and symbolism of a sign depends on the cultural convention and are on that ground in relation with each other.
If the cultural convention has greater influence on the sign, the signs get more symbolic value.
It is common to take a different sign convention for this equation than one typically does when defining fundamental solutions.
Note that, with the opposite sign convention ( used in Physics ), this is the potential generated by a point particle, for an inverse-square law force, arising in the solution of Poisson equation.
Note that, with the opposite sign convention, this is the potential generated by a pointlike sink ( see point particle ), which is the solution of the Euler equations in two-dimensional incompressible flow.
It is important to realize that the choice of sign for time-dependence, exp (- iωt ), dictates the sign convention for the imaginary part of permittivity.
At a given frequency, the imaginary part of leads to absorption loss if it is positive ( in the above sign convention ) and gain if it is negative.
Countries that sign the convention are required to adopt national laws, and remove old ones, so that persons with disabilities will, for example, have equal rights to education, employment, and cultural life ; to the right to own and inherit property ; to not be discriminated against in marriage, etc.
k < sub >–</ sub > – k < sub >+</ sub >, and it follows the sign convention of natural optical activity.
An alternative commenting convention affects an entire source code file, known as a " literate script ", in which every line is considered a comment unless it starts with a sign.
The amount a particular material or compound is affected by ambient moisture may be considered its coefficient of hygroscopic expansion ( CHE ) ( also referred to as CME, coefficient of moisture expansion ) or coefficient of hygroscopic contraction ( CHC )— the difference between the two terms being a difference in sign convention and a difference in point of view as to whether the difference in moisture leads to contraction or expansion.

sign and changes
The most important property of these wavefunctions is that exchanging any two of the coordinate variables changes the wavefunction by only a plus or minus sign.
The Foreign Office took Weizsäcker's appointment as a sign that Ribbentrop was a man, who, though personally disagreeable and unpleasant, was one they could work under: no radical changes were in the offing.
However, despite these changes, the band still struggled to sign a record deal.
Their toppling of the RPCR ( that was until then seen as the only voice of New Caledonian whites ) was a surprise to many, and a sign that the society of New Caledonia is undergoing changes.
The sign of the Covenant changes its external form to reflect new spiritual realties.
Oxygen and carbon dioxide are also essential components of blood chemistry, where significant changes in their concentrations may be a sign of illness or injury.
There are symbols to represent facial movements that are used in various sign languages, including eyes, eyebrows, nose movements, cheeks, mouth movements, and breathing changes.
A vector which gains a minus sign when the orientation of space changes is called a pseudovector or an axial vector.
The enthalpy of condensation ( or heat of condensation ) is by definition equal to the enthalpy of vaporization with the opposite sign: enthalpy changes of vaporization are always positive ( heat is absorbed by the substance ), whereas enthalpy changes of condensation are always negative ( heat is released by the substance ).
It takes a leading role when questions of parity arise, because the volume element as a directed magnitude changes sign under a space-time reflection.
# When a reaction is reversed, the magnitude of ΔH stays the same, but the sign changes.
Moreover, U can be chosen to be a rotation matrix, as inverting an axis does not have any effect on N ( 0, Λ ), but inverting a column changes the sign of U's determinant.
A person with MS can suffer almost any neurological symptom or sign, including changes in sensation such as loss of sensitivity or tingling, pricking or numbness ( hypoesthesia and paresthesia ), muscle weakness, clonus, muscle spasms, or difficulty in moving ; difficulties with coordination and balance ( ataxia ); problems in speech ( dysarthria ) or swallowing ( dysphagia ), visual problems ( nystagmus, optic neuritis including phosphenes, or diplopia ), fatigue, acute or chronic pain, and bladder and bowel difficulties.
Yum Brands, owner of KFC, called the video appalling, and threatened to stop purchasing from Pilgrim's Pride if no changes were made ; Pilgrim's Pride fired 11 employees, and introduced an anti-cruelty pledge for workers to sign.
In two dimensions the angular velocity is a pseudoscalar, a quantity which changes its sign under a parity inversion ( for example if one of the axes is inverted or they are swapped ).
If parity is inverted, but the sense of a rotation does not, then the sign of the angular velocity changes.
The induction and dispersion interactions are always attractive, irrespective of orientation, but the electrostatic interaction changes sign upon rotation of the molecules.
Further, the ability to modify sign meaning through phonological changes to signs is gaining attention.
The Cabinet changes were widely seen as a sign of panic, and the young Liberal MP Jeremy Thorpe said of Macmillan's dismissal of so many of his colleagues, ' greater love hath no man than this, than to lay down his friends for his life '.
Aside from the introduction of an optional exchange of a sign of peace, the changes in the remainder of the Liturgy of the Eucharist are less notable.
All real gases have an inversion point at which the value of changes sign.
The motion of a charged body in a magnetic field, B involves the velocity through the Lorentz force term v × B, and might seem at first to be asymmetric under T. A closer look assures us that B also changes sign under time reversal.
Similarly, any operation that reverses the sense of phase, which changes the sign of i, will turn positive energies into negative energies unless it also changes the direction of time.

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