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Topic: Velocity of propagation

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	RF Connection Coaxial Cable
		Velocity of propagation 66%; outer diameter.405"; 2 layers 98% Ag/Cu braid.
		Velocity of propagation 66%; outer diameter.405"; 2 layers 98% Tinned/Cu braid.
		Nominal impedance 75 ohm; velocity of propagation 65.9%; outer diameter.242"; 98% Cu braid.
	www.therfc.com /coax.htm (1346 words)

	Chapter 7. The Apparent Incompatibility of the Law of Propagation of Light with the Principle of Relativity. Einstein, ... (Site not responding. Last check: 2007-10-14)
		At all events we know with great exactness that this velocity is the same for all colours, because if this were not the case, the minimum of emission would not be observed simultaneously for different colours during the eclipse of a fixed star by its dark neighbour.
		The assumption that this velocity of propagation is dependent on the direction “in space” is in itself improbable.
		If every ray of light is propagated relative to the embankment with the velocity c, then for this reason it would appear that another law of propagation of light must necessarily hold with respect to the carriage—a result contradictory to the principle of relativity.
	www.bonus.com /contour/bartlettqu/http@@/www.bartleby.com/173/7.html (845 words)

	Topic 10. Reflections, Part 1. Waves on a rope
		The propagation of the wave consists of an exchange between two types of energy: the elastic potential energy that is stored in the stretched rubber bands is converted to kinetic energy of the moving masses, and this kinetic energy in turn is converted back into elastic potential energy when the next rubber band is stretched.
		The velocity of propagation in this case depends on two quantities: (1) the stiffness of the rubber bands, which determines the magnitude of the force that is transmitted to an adjacent mass for a given displacement, and (2) the size of each mass, which determines how quickly the mass will respond to the transmitted force.
		The velocity of propagation varies directly with the stiffness of the rubber bands and inversely with the mass at each junction.
	www.colorado.edu /physics/phys1230/phys1230_fa01/topic10.html (573 words)

	Cardiovascular Ultrasound \| Full text \| Flow propagation velocity is not a simple index of diastolic function in early ... (Site not responding. Last check: 2007-10-14)
		Early and late filling phases are seen as waves of stretching, propagating from the base to the apex of the ventricle (fig 1), with a measurable propagation velocity.
		As the value of flow propagation depends on the method used: Black – to colour transition [11], front of first aliased contour [18] or main vector [19] as shown in fig 4, all three values was measured for comparison of results and variability.
		Flow propagation velocity, in this study, was found to be significantly increased in patients with delayed relaxation, and was shown to be dependent on both strain rate propagation and mitral inflow velocity, and is thus not a simple index of diastolic function.
	www.cardiovascularultrasound.com /content/1/1/3 (3397 words)

	Patent 5743856: Apparatus for measuring pulse-wave propagation velocity (Site not responding. Last check: 2007-10-14)
		There is known a pulse-wave propagation velocity measuring apparatus including a pair of pulse-wave sensors which are put on different locations on the skin of a living subject to press different portions of an artery of the subject via the skin and detect respective pulse waves from the artery.
		Therefore, the propagation velocity measured by the prior apparatus may not directly be used as an index indicative of a degree of arterial sclerosis.
		In the pulse-wave propagation velocity measuring apparatus in accordance with the sixth aspect of the invention, however, the reference-point determining means determines, as the reference point, a point of intersection of the maximum-slope line and the base line.
	www.freepatentsonline.com /5743856.html (13214 words)

	What is VOP? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-10-14)
		Velocity of Propagation is the speed of a signal in relation to the speed of light in a vacuum (186,400 miles per second).
		A cable with a VOP of.75 transmits a signal at 75% of the speed of light.
		Factors that affect the velocity of propagation are various insulation materials and thicknesses.
	www.webopedia.com /TERM/V/VOP.html (93 words)

	Relativity: Chpt. 7 (Site not responding. Last check: 2007-10-14)
		By means of similar considerations based on observa- tions of double stars, the Dutch astronomer De Sitter was also able to show that the velocity of propagation of light cannot depend on the velocity of motion of the body emitting the light.
		The velocity of propagation ot a ray of light relative to the carriage thus comes cut smaller than c.
		If every ray of light is propagated relative to the embankment with the velocity c, then for this reason it would appear that another law of propagation of light must necessarily hold with respect to the carriage — a result contradictory to the principle of relativity.
	einey.com /temp/rel/ch07.htm (778 words)

	Fracture Mechanics (Site not responding. Last check: 2007-10-14)
		Cracks in brittle isotropic and homogeneous material propagate where the mode II stress intensity factor is zero and the stress field is symmetrical around the crack (Cotterell and Rice 1980).
		This means that the maximum velocity of hard-hammer percussion is about.3 of the velocity of shear waves.
		Apparently, velocity has little effect on the stress field, and measurable affects are not significant at the comparatively low velocities of crack propagation recorded for percussion and pressure flaking (Cotterell and Kamminga 1987).
	imnh.isu.edu /digitalstones/intro1/FractureMechanics2.html (399 words)

	Connector Specifier - Simplifying High-speed Cable Assembly Testing (Site not responding. Last check: 2007-10-14)
		Velocity of propagation delay measures the transmission speed of a signal through a medium compared to the speed of light.
		The measurement of the velocity of propagation delay is based on the phase delay measurement.
		The cable assembly process does not change the properties of cable materials and, thus, the velocity of propagation delay is independent of the cable assembly process.
	cs.pennnet.com /Articles/Article_Display.cfm?Article_ID=109149 (1468 words)

	Determination of the Burst Initiation Location and the Tear Propagation Velocity during Air Burst Testing of Latex ...
		To determine the rip velocity in a simple and inexpensive manner, the first system was designed to determine the rip velocity of the tear by basing the measurement on the known velocity of the propagation of sound in air.
		The velocity of a moving image is found by relating the location and separation between the two recorded images, the separation between the two slits within the camera and the velocity of the film.
		In addition, tear propagation velocities along the two areas where the shank either curves towards the attachment device and the area at the top where it curves towards the tip are two regions where the transversal rip velocity seems to be equal to or even greater than the longitudinal tear velocity.
	www.rit.edu /~andpph/text-high-speed-condom.html (2567 words)

	Influence of Timber Humidity on the Velocity of Propagation of Ultrasound (Site not responding. Last check: 2007-10-14)
		Influence of Timber Humidity on the Velocity of Propagation of Ultrasound
		The presence of humidity in materials is known that it interferes in the propagation of ultrasonic waves.
		The velocity of ultrasound was analyzed in timber longitudinal, radial and tangential directions, for moistures varying from 0% to 100%.
	www.ndt.net /abstract/ndtiss99/data/36.htm (198 words)

	Dictionary of Technical Terms for Aerospace Use - V (Site not responding. Last check: 2007-10-14)
		In sense 1, velocity is often used synonymously with speed, as in the velocity of the airplane, but in such contexts speed is properly the preferred term; except in the compound airspeed, velocity is preferred to speed in reference to motion of air or other fluid.
		The velocity of escape on the surface of the earth is nearly 7 miles per second, neglecting air resistance.
		The velocity of propagation of surfaces of constant phase.
	www.jsc.nasa.gov /er/seh/v.html (3242 words)

	The Ezekial Equation (Site not responding. Last check: 2007-10-14)
		In a compressional medium, the velocity of propagation of an impulse is given as the square root of the ratio of Bulk Modulus over mass density.
		In the case of a tensional medium, the propagation velocity is given by the square root of the ratio of tension to mass density, where the tension describes the energy per unit volume as before.
		In terms of the constant velocity of light in space, the velocity of propagation is equal to the square root of tension over mass density.
	www.pride-net.com /physics/StarFlight/star3.htm (3249 words)

	Patent 5032073: Thin walled high velocity propagation of foamed thermoplastic resins (Site not responding. Last check: 2007-10-14)
		Because not all of the melt stream is flowing at the same velocity, the volume of molten extrudate which exits the die is not uniform over its crossection.
		That portion of the extrudate which exhibits the greatest velocity correspondingly exhibits a greater volume flow per unit time; i.e.; the amount of molten compound exiting the round orifice of the die is not uniform.
		The measured electrical velocity of propagation was approximately 91%.
	www.freepatentsonline.com /5032073.html (4792 words)

	Aerospace Science and Technology Dictionary V Page
		The apparent height of an ionized atmospheric layer determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence, assuming that the velocity of propagation is the velocity of light in a vacuum over the entire path.
		The ratio of the shearing component of stress to the velocity gradient in a fluid where the stress acts across a plane perpendicular to the direction of the velocity gradient.
		The dissipation of energy that occurs when a particle in a vibrating system is resisted by a force that has a magnitude proportional to the magnitude of the velocity of the particle and direction opposite to the direction of the particle.
	www.hq.nasa.gov /office/hqlibrary/aerospacedictionary/508/v.html (5768 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		The length is computed from the propagation delay measurement using a constant for the nominal velocity of propagation (NVP).
		is the nominal velocity of propagation or the relative velocity (to speed of light in a vacuum) factor.
		The temperature coefficient of the propagation delay in the cable was found to be less than 0.006%/ ºC from 0 ºC to 48 ºC. Variations in the temperature of test laboratories will therefore not measurably affect the accuracy of the test.
	www.fluke.com /nettools/Support/TechNotes/dsptrace.asp (2423 words)

	Siemens Communications Lexicon - automatic baud rate detection (ABR)
		When signals are transported over a physical medium, the propagation speed is slower than the speed of light and depends on the type, structure and transmission parameters of that medium.
		NVP specifies the signal propagation delay in a physical medium in relationship to the speed of light in a vacuum.
		Propagation speeds over cables are typically 60% to 80% of the speed of light (c).
	networks.siemens.com /communications/lexicon/6/f009116.htm (108 words)

	Tibet Regi (Site not responding. Last check: 2007-10-14)
		We present observations of regional phase velocity and propagation characteristics using data recorded during a one year deployment of broadband digital seismic stations across the central Tibetan Plateau along the Qinghai-Tibet highway from Golmud to Lhasa.
		Pn can be clearly picked for all observed paths and propagates at an average velocity of 8.3 km/s throughout the entire region and is diminished to 8.16 km/s within the Tibetan Plateau.
		We also observed that the Pn velocity within this region of inefficient high frequency Sn propagation is nearly 4% slower than the Pn velocity computed for paths restricted to the southern plateau and that the crust is about 10 km thinner than in the south.
	kiska.giseis.alaska.edu /Input/affiliated/mcnamara/tibet_regi.html (341 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Definition of phase velocity: The velocity of propagation of a uniform plane wave, given by (a) the product of the wavelength and the frequency divided by (b) the refractive index of the medium in which the wave is propagating.
		Definition of group velocity: The velocity of propagation of an envelope produced when an electromagnetic wave is modulated by, or mixed with, other waves of different frequencies.
		Note: The group velocity is the velocity of information propagation and, loosely, of energy propagation (but it is not always the case).
	www.science.gmu.edu /~yxing/753 (206 words)

	ScienceWeek
		Propagation of the soliton without dispersion over a macroscopic distance of 1.1 millimeters is observed.
		In general, a "wave" is a time-varying quantity that is also a function of position, a disturbance either continuous or transient, traveling through a medium as a result of certain properties of the medium, the resulting displacements of the medium returning to zero when the disturbance has passed.
		The chief parameters of a wave are its speed of propagation, its frequency, its wavelength, and its amplitude.
	scienceweek.com /2003/sw030404.htm (10906 words)

	Astrolab - Engineering - Velocity of Propagation
		Velocity of propagation is the speed of signal transmission relative to the speed of light.
		Since it is inversely proportional to the square root of the dielectric constant, a lower dielectric constant will result in an increase in velocity.
		Velocity of propagation is expressed as a percentage of the speed of light in a vacuum and can be calculated by the following formula:
	www.astrolab.com /5.asp (63 words)

	JTE - Velocity of Propagation description (Site not responding. Last check: 2007-10-14)
		The Velocity Of Propagation or VOP is the speed at which an electrical signal passes through a cable.
		The VOP is usually expressed as a percentage, where the denominator is the speed of light.
		Since the VOP is an electrical property of the cable, whether or not the cable is coiled or straight effects the VOP value.
	www.nteinc.com /jovial/shortstop/vop.html (334 words)

	Template
		This decreases the velocity of propagation of the electromagnetic radiation in that material.
		The greater the tendency of molecules to orientate uniformly, the greater the dielectric constant and thus the slower the velocity of propagation of electromagnetic radiation in that material.
		The velocity of propagation of electromagnetic radiation through soil depends on the relative volumes of each of these three constituents.
	www.usyd.edu.au /agric/web04/tdr_final.htm (1967 words)

	NVP (Nominal Velocity of Propagation) 是如何计算的？ (Site not responding. Last check: 2007-10-14)
		The round-trip propagation delay is the time required for an electrical pulse to travel to the end of the link and back to the tester.
		The NVP, the acronym for Nominal Velocity of Propagation, expresses the speed with which electrical signals travel in the cable relative to the speed of light in space or vacuum.
		Its length measurement accuracy is influenced by the ability or sensitivity to accurately detect the leading edge of the reflected pulse.
	www.anheng.com /articles/faq/nvp.htm (955 words)

	International Journal of Electrical Engineering Education: Velocity of propagation in tranmission lines
		Initially, the difficulty in defining the propagation velocity, when the finite conductivity and the skin effect are taken into account, is discussed.
		The propagation time tp for a 20 km typical* matched power transmission line, excited by a 20 us rectangular unit voltage pulse, is 161 [is without considering the skin effect and 153 pLS when the skin effect is taken into account.
		The propagation time tp indicates that the pulse velocity increases if the skin effect is taken into account, mainly due to the fact that, in this case, the internal inductance decreases with the frequency.
	www.findarticles.com /p/articles/mi_qa3792/is_199801/ai_n8784410 (1109 words)

	text1
		Lately, Quantum physicist have made observations which demonstrate that, of the two current explanations of quantum theory, the one which requires that the velocity of propagation of quantum effects be infinite velocity rather than being limited to the velocity of light, is consistent with the results of observation.
		Experiments have shown that the velocity of the coupling of the polarization angle (the quantum number of the photon) of "paired photons" occurs at a velocity of at least four times the velocity of light and perhaps at an infinite velocity.
		Such a coupling velocity prevents physicists from hiding behind the idea that there is no absolute velocity reference frame and forcibly re-establishes the idea of Aether and demolishes the idea of "space-time" as other than as a conventional mathematical abstraction.
	members.aol.com /einsteinhoax/posting17.htm (1641 words)

	[No title]
		Since the product of area and velocity is a constant, the velocity goes down by a factor of four.
		The velocity of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s.
		Since wavelength depends on velocity and the velocity of propagation of sound in air is different that the velocity of propagation of a wave on the string, the wavelengths are different as well.
	www.drake.edu /artsci/physics/examfouranswers.doc (1089 words)

	Calculation of the Quench Propagation Velocity
		The quench propagation velocity is zero as a normal-conducting zone cannot expand at a very low transport current (cryo-stability).
		In the second case the quench propagation approaches the velocity of light when the transport current is the critical current since the entire cable quenches practically at the same time.
		At first, the quench propagation velocity is evaluated between the two cases without transverse cooling.
	quench-analysis.web.cern.ch /quench-analysis/phd-fs-html/node61.html (280 words)

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