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Topic: Particle velocity

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	[No title]
		Particle velocity represents the velocity of a particle at any instant in time during a vibration disturbance.
		Particle velocity is the rate of change of particle displacement with respect to time.
		The units of particle velocity are most often given in inches per second or millimeters per second.
	www.blastconsulting.co.za /technical.html (216 words)

	ParticleAPI: PContextActions_t Class Reference
		Particles are tested to see whether they will pass from being outside the specified domain to being inside it within look_ahead time units from now if the next Move() action were to occur now.
		Particles are tested to see whether they will pass from being outside the specified domain to being inside it if the next Move() action were to occur now.
		Since particles are tested to see whether they would pass through the domain if Move() were called now, it is best to have Bounce() be the last action that modifies a particle's velocity before calling Move().
	www.particlesystems.org /Distrib/ParticleLib/doc/html/class_p_a_p_i_1_1_p_context_actions__t.html (3893 words)

	Theremin Vox - Particle velocity
		Particle velocity is the velocity of a particle(real or imagined) in a medium as it transmits a wave.
		When applied to a sound wave through a medium of air, particle velocity would be the physical speed of an air molecule as it moves back and forth in the direction the sound wave is travelling as it passes.
		Particle velocity should not be confused with the speed of the wave as it passes through the medium, i.e.
	www.thereminvox.com /article/view/164/1/37 (169 words)

	Theremin Vox - Stories - Theory - Sound and Hearing -
		Particle displacement or particle amplitude ξ is a distance measurement in m (metre) of the movement of a particle(real or imagined) in a medium as it transmits a wave.
		Although it is widely used as a measure of the loudness of sound, the decibel is more generally a measure of the ratio between two quantities, and can be used to express a wide variety of measurements in acoustics and electronics.
		Velocity is a vector measurement of the rate and direction of motion.
	www.thereminvox.com /article/archive/37 (340 words)

	Particle Velocity Measurements in HVOF and APS Systems Page (Site not responding. Last check: )
		It is the condition of the particles (temperature, velocity, trajectory, density of particles etc.) of material being sprayed during their time of flight in the process jet and immediately prior to deposition which more closely determine the quality and characteristics of the coating produced.
		Particle velocity could then be calculated from the time interval, or delay, between the firing of the two lasers (2 µs for HVOF, 8 µs for APS) and the distance between the twin images of each particle.
		The lower particle velocities at the gun nozzle exit (Figure 3) indicated that, for 88/12 WC/Co, powder particles continued to accelerate slightly after exiting the nozzle, probably due to the increase in gas velocity resulting from the free expansion and acceleration of the burning gases into the atmosphere.
	www.controlvisioninc.com /hvoftech.html (3373 words)

	Particle velocity (Site not responding. Last check: )
		Particle velocity is the velocity v of a particle (real or imagined) in a medium as it transmits a wave.
		When applied to a sound wave through a medium of air, particle velocity would be the physical speed of an air molecule as it moves back and forth in the direction the sound wave is travelling as it passes.
		in the case of a sound wave, particle velocity is not the same as the speed of sound.
	www.tocatch.info /en/Acoustic_velocity.htm (180 words)

	Follow that Particle (Site not responding. Last check: )
		The particle moves away from the origin then in what is considered a positive direction until 3.73 seconds when it turns around and comes back toward the origin.
		At 2 seconds the particle is 22 feet from the origin and it continually increased distance form 1 second to 2 seconds.
		The acceleration is negative and the particle is slowing down from 2.5 seconds to 3.73 seconds as the particle slows to turn around.
	users.stlcc.edu /amosher/FollowthatParticle.htm (492 words)

	Building Your Own 3D Particle Generator
		We'll refer to the null as the particle “emitter” and later we'll move the null around to impart “emitter velocity” to the particles.
		That effect is the velocity imparted by the “emitter” to the particles.
		When a particle is born, its initial position is within plus or minus half the emitter width (in the x direction) from the position of the null.
	www.creativecow.net /articles/ebberts_dan/particle_gen/index.html (4153 words)

	To do:
		The Particle System API is intended for special effects in interactive and non-interactive graphics applications, not for scientific simulation, although principles of Newtonian physics have been used to implement the particle dynamics where applicable.
		The Particle System API is generally useful for operating on many similar objects that all move and change according to the same basic rules, no matter what the objects and rules are.
		A particle in the abstract sense used by the API is merely an entity with a small set of attributes such as position and color that ultimately dictate the particle's behavior and appearance.
	www.cs.unc.edu /~davemc/Particle/Distrib/ParticleHelp_121.html (7193 words)

	To do: (Site not responding. Last check: )
		Particles are tested to see whether they will pass from being outside the specified domain to being inside it if the next pMove action were to occur now.
		Since particles are tested to see whether they would pass through the domain if pMove were called now, it is best to have pBounce be the last action that modifies a particle's velocity before calling pMove.
		Particles in the shock wave are accelerated away from the center by an amount proportional to magnitude.
	www.alice.org /advancedtutorial/ParticleAPIDocs.html (7435 words)

	Nice To Know... Microflown - Particle velocity (Site not responding. Last check: )
		When the number of particles increases in this certain volume, particles have to enter the volume: there has to be a movement of particles.
		The pressure- and particle velocity signal seems to be the same, however when one takes a closer look, it is possible to see that the pressure signal is 180 degrees shifted in phase after the reflection at the end of the tube.
		The minima in the pressure are separated by 30 centimetres, while the minima in the particle velocity are shifted for + wavelength due to the reactive sound field in a standing wave tube.
	www.dse.nl /~gal/micro_Particle.html (292 words)

	Gaseous Particle Simulator (Site not responding. Last check: )
		Particle Physics Simulator is designed to illustrate the motion of a variable number of particles within a small container, indirectly accounting for thermal energy contained in the gas.
		Gasesous particle physics is a difficult science to investigate because it is difficult to observe gas particles.
		The third is simulating collisions between particles and the walls of the container, and the final problem is calculating pressure on the container walls based upon the data recorded by the collisions between particles and the walls of the container.
	www.aspire.cs.uah.edu /aspire/particlesimulator.html (3572 words)

	Gamasutra - Features - "Building a Million-Particle System"
		We assume that the particles can be grouped by a particle type in order to minimize the amount of static attribute parameters that need to be uploaded during the final rendering of the particles.
		This particle type can either be directly coupled in a one-to-one relationship to the particle emitter or a group of emitters emits all particles of the same type.
		As particles at the end of their lifetime usually fade out or fall out of visible areas anyway, the extra pass rarely really needs to be done.
	www.gamasutra.com /features/20040728/latta_02.shtml (3804 words)

	Gunshot residue particle velocity and deceleration
		These particles were found to have an average velocity of 500 to 600 ft per second.
		The relatively high velocity that the particles acquire explain the formation of stippling on skin in close proximity to a muzzle discharge.
		The particles experienced rapid rates of deceleration which would explain why few particles are found in test firings beyond 3 ft from the muzzle of a discharged firearm.
	www.astm.org /DIGITAL_LIBRARY/JOURNALS/FORENSIC/PAGES/4765.htm (221 words)

	Elastic Collisions
		, then the velocity of particle 2 is greater than the velocity of particle 1, as is illustrated in the right panel of figure 10.2.
		Suppose we wish to view the results of an elastic collision in a reference frame in which particle 2 is initially stationary.
		All we have to do is to transform the velocities into a reference frame moving with the initial velocity of particle 2, as illustrated in figure 10.3.
	www.physics.nmt.edu /~raymond/classes/ph13xbook/node107.html (338 words)

	Particle Terminal Settling Velocity
		The terminal settling velocity of a rigid particle is an important parameter in many solid liquid separations.
		Even the Expert System for filtration equipment specification has the option of using settling velocity to determine equipment type, and simulations of sedimentation equipment require this fundamental property.
		The preferred technique for the calculations is by the Heywood Tables, for larger particles, and Stokes' Law for small ones.
	www.filtration-and-separation.com /settling/settling.htm (94 words)

	Microflown Technologies - Home
		By measuring the temperature difference in the cross section of two extremely thin platinum wires placed in parallel, this extremely fast mass flow sensor is capable of monitoring the movement of air particles.
		Any sound field is described completely by both the (scalar) value sound pressure and the (vector) value acoustic particle velocity.
		Within the vehicle manufacturing industry, Microflown based testing methods are used for both the development of new prototypes and end of line acoustic testing during manufacturing.
	www.microflown.com (166 words)

	Sound Intensity-Technical Information
		The most common method of measuring the particle velocity is a pair of phase-matched microphones locked at a fixed distance apart.
		By comparing the differences between the sound signal at the two microphones, the sound intensity analyzer can compute both the sound pressure and particle velocity at the mid-point between the two microphones, and can multiply the two together to compute the sound intensity.
		Because sound intensity is based on both acoustic pressure and velocity it has a direction.
	www.soundintensity.com /si_technical.htm (278 words)

	A question about particle velocity - NewTek Discussions
		When I set a particle emmiter's velocity (in the motion tab) to say, -3 on the x, for some reason instead of the particles travelling at the fixed rate of -3 meters per second, they go about -3 meters and start collecting there.
		Particle restistance affects how the particle are broken down from "virtual air" in the scene.
		You can also increase the Particle Weight, so they have a higher inertia and are harder to stop.
	www.newtek.com /forums/showthread.php?p=381127&mode=linear (407 words)

	Parameter extraction of source plasma from observed particle velocity distribution
		Plasma measurements in the Earth's magnetotail have revealed occasional existence of multiple plasma components containing a fast flowing beam embedded within a stationary population during dynamic episodes.
		We present here a quantitative procedure to extract plasma parameters at the source location of a fast flowing beam from the observed 3D velocity distribution.
		Citation: Lui, A. Parameter extraction of source plasma from observed particle velocity distribution, Geophys.
	www.agu.org /pubs/crossref/2006/2006GL027922.shtml (268 words)

	Sound pressure level, acoustics, particle velocity, acoustic impedance, sound intensity characteristic impedance dB SPL ...
		Sound pressure level, acoustics, particle velocity, acoustic impedance, sound intensity characteristic impedance dB SPL calculations ohm's law acousticequivalent pascal audio calculations sound units - sengpielaudio
		In acoustics sound pressure, particle velocity and acoustical impedance are linear
		The sound intensity is a quadratic sound energy strength value.
	www.sengpielaudio.com /calculator-ak-ohm.htm (238 words)

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