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Topic: High frequency limit

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	Encyclopedia: High frequency (Site not responding. Last check: 2007-11-06)
		High frequency (HF) radio frequencies are between 3 and 30 MHz.
		The high frequency band is very popular with amateur radio operators, who can take advantage of direct, long-distance (often inter-continental) communications and the "thrill factor" resulting from making contacts in variable conditions.
		International shortwave broadcasting utilizes this set of frequencies, as well as a seemingly declining number of "utility" users (marine, aviation, military, and diplomatic interests), who have, in recent years, been swayed over to less volatile means of communication (e.g.
	www.nationmaster.com /encyclopedia/High-frequency (1189 words)

	Phase locked loop with high and/or low frequency limit detectors for preventing false lock on harmonics - Patent 4590440
		Frequency divider 22 divides the frequency of the signal applied to input lead 21 to allow a smaller counter 23 to be used to detect the frequency of the signal applied to input lead 21.
		In this manner, limiter circuit 17 insures that the frequency of the output signal of VCO 1 is sufficiently close to the frequency of the input signal on input lead 5 to allow phase locked loop 16 to lock on to the desired input frequency rather than a harmonic of the desired frequency.
		Limiter circuit 15 insures that the frequency of the output signal of VCO 1 is sufficiently close to the frequency of input signal V.sub.in to allow phase locked loop 16 to lock on to the desired input frequency rather than a harmonic of the predefined frequency.
	www.freepatentsonline.com /4590440.html (4182 words)

	High frequency limit - Wikipedia, the free encyclopedia
		The high frequency limit of hearing is the upper extent to which a particular animal can perceive sound.
		So-called "silent" dog whistles exploit this phenomenon by producing sounds at frequencies higher than those audible to humans but well within the range of a dog's hearing.
		The sound can then be sampled at the standard CD sample rate of 44.1 kHz, set somewhat higher than the calculated Nyquist-Shannon rate of 41 kHz to allow for the cut-off slope of a reasonable band-pass filter.
	en.wikipedia.org /wiki/High_frequency_limit (195 words)

	slemrod_abs (Site not responding. Last check: 2007-11-06)
		The high frequency singular perturbation limit of an elastic structure in a rapidly flowing fluid
		This talk discusses the high frequency limit of dynamics of an elastic cylinder imbedded in an incompressible inviscid fluid.
		The goal of the analysis is to study the high vortex shedding frequency dynamics induced by a large far field velocity.
	www.wisdom.weizmann.ac.il /math/varlim/slemrod_abs.html (55 words)

	High frequency limit -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-06)
		So-called "silent" (Click link for more info and facts about dog whistle) dog whistles exploit this phenomenon by producing sounds at frequencies higher than those audible to humans but well within the range of a dog's hearing.
		Likewise, when compressing a digital signal, an acoustic engineer can safely assume that any frequency beyond approximately 20.5 kHz will not have any effect on the perceived sound of the finished product, and thus use a (Click link for more info and facts about band-pass filter) band-pass filter to cut everything outside this range.
		The sound can then be sampled at the standard CD sample rate of 44.1 kHz, set somewhat higher than the calculated (Click link for more info and facts about Nyquist-Shannon) Nyquist-Shannon rate of 41 kHz to allow for the cut-off slope of a reasonable band-pass filter.
	www.absoluteastronomy.com /encyclopedia/h/hi/high_frequency_limit.htm (218 words)

	Publications at The Centre For Water Research (Site not responding. Last check: 2007-11-06)
		The appearance of this high frequency internal wave energy was closely related to the strength of the wind field.
		The relationship of the high frequency waves to the wind and the basin-scale internal waves implies a generation mechanism associated with shear in the surface layer (observed to be approximately 0.08 s-1), similar to that responsible for generating high frequency internal waves in the equatorial Pacific.
		A linear stability analysis of the mean state during periods of high frequency wave activity revealed the existence of unstable modes, whose period and frequency bandwidth closely matched field observations.
	www.cwr.uwa.edu.au /publications/detail/1832 (230 words)

	Coulomb Interaction and Transport in Tunnel Junctions and Quantum Dots -- from Mathematica Information Center
		Its frequency dependence is used to define a dynamical capacitance.
		It is argued that Coulomb interaction is of minor importance at higher frequencies and that dynamic and static capacitances are the same.
		The limitations of the description in terms of a capacitance are discussed.
	library.wolfram.com /infocenter/Articles/3341 (170 words)

	Veterinary Neurology and Neurosurgery Electrophysiology Notes: Advantages of Digital EEG (Site not responding. Last check: 2007-11-06)
		In addition to monetary limits, there is an inherent limit on the number of electrodes that can be placed on the head of most veterinary patients, whose calvaria are often smaller even than those of children.
		Lowering the high frequency limit ("filtering") can reduce the muscle artifacts; however, when this is done the "hard copy" recording is permanently changed and the changes cannot be undone.
		The high frequency limit on most digital EEG equipment is about 90 Hz, thus substantial amounts of muscle potentials will be included in the recording.
	www.neurovet.org /Electrophysiology/AdvantagesDigitalEEG/AdvantagesDigitalEEG1.htm (1195 words)

	Stabilization
		In the high frequency limit we derive adiabatic equations involving only the pulse envelope where transitions between adiabatic states are purely ramp effects.
		For a short-ranged potential having a single bound state we show that ionization suppression is caused by the appearance of a laser induced resonance state, which is coupled by the pulse ramp to the ground state and traps ionizing flux.
		However, at high frequencies and ultra high intensities the ionization may be suppressed.
	www.fh.huji.ac.il /~roib/stabilization.htm (404 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		For brain diameters 4 cm and greater, the fundamental frequency generated in a spherical model of the brain, with a constrained boundary, was within the high frequency resolving power of the ear.
		For mammals with brain diameters smaller than 4 cm, the high frequency limit of the ear was consistent with the resonant frequency predicted in a stress-free spherical model.
		Further, when microwave induced cochlear microphonics were reported in mammals, the frequency of the microphonic was similar to the predicted resonant frequency of the brain.
	wildlifedamage.unl.edu /handbook/Chapters/1997birdstrikelenhardt1.doc (290 words)

	Servodrive Contra Bass
		The ContraBass unit features extended low-frequency range of 16Hz to 125 Hz filling the increasing demand for an accurate extended-range, low frequency response subwoofer with high acoustic output and compact size.
		Due to the fact that the thermal time constant on the motor armature is long, large short-term power levels can be safely tolerated.
		This allows for FULL frequency response (16 to 125 Hz) to be produced accurately and clearly.
	www.servodrive.com /contrabass.html (155 words)

	Golf Course Irrigation System (Site not responding. Last check: 2007-11-06)
		To prevent high pressure within the piping system, the drive will also be shut off in the event that the system pressure rises to 105 lbs before the drive lowers the output frequency to 30 Hz.
		Note that a condition of a high number of sprinklers being opened simultaneously may be interpreted as a broken pipe.
		The outputs will be active only when the high or low condition is in effect and the outputs will return to the normal state when the high or low condition is relieved.
	www.pumpcontrolandprotection.com /id41.html (799 words)

	Re: What do we hear in High frequency hearing (=?ISO-8859-1?Q?S=F8ren_Buus?= )
		It could be that a limited attenuation in the rejection=20 band on the high-frequency side of the auditory filter allows high-level=20 ultrasound to excite the inner hair cells at the basal end of the cochlea.
		It could be that a limited attenuation in the rejection band on=20 the high-frequency side of the auditory filter allows high-level ultrasound to excite the inner hair cells at the basal end of the cochlea.
		In the case of hearing ultrasound via bone conduction, it would seem that the acoustic signal would have to be bypassing the usual cochlear filtering process and stimulating the hair cells via a nonconventional path.
	www.auditory.org /postings/2002/511.html (709 words)

	[No title]
		Students can set the frequency of a sine wave which is sampled into a discrete signal and then reconstructed back into a continuous one.
		When the sampling rate is high enough, a good reconstruction of the original signal emerges.
		Adjust the frequency of the sine wave to be sampled as well as the sampling frequency by using the sliders located under the topmost graphing window in the applet.
	www.cs.brown.edu /exploratories/freeSoftware/repository/edu/brown/cs/exploratories/applets/nyquist/nyquist_limit_guide.html (248 words)

	The Tube CAD Journal: Active Crossovers and filters
		With a high frequency limit of 80 Hz the subwoofers seldom even move with pop music, but with Mahler's 3rd symphony, they work overtime.
		A further reason is that woofers are slow heavy devices that cannot reproduce the harsh high harmonic of the clipped low frequency waveform.
		And since it is usually the low frequencies the demand the greatest share of power, the two 36 watt amplifiers may even seem more powerful than a 144 watt amplifier as long as the high frequency amplifier has not clipped.
	www.tubecad.com /articles_2001/Active_Crossovers_and_Filters/page2.html (546 words)

	Project 83 - MOSFET Power Follower
		To maintain good low frequency response, C3 will need to be about 100uF, although even with 25uF, the low frequency response is maintained to 2Hz.
		Ideally, the input network should define the low frequency limit, so the higher value is recommended if R4 is reduced.
		This article, including but not limited to all text and diagrams, is the intellectual property of Pavel Macura and Rod Elliott, and is Copyright © 2001.
	sound.westhost.com /project83.htm (1320 words)

	Troubleshooting a Simulation
		Delta frequency defines the frequency spacing with which the convolution-based devices are sampled in the frequency domain.
		This may be stated in the frequency domain by saying that the real and imaginary parts of a causal frequency response are related by the Hilbert transform.
		The Max Frequency parameter should never be set to a value which is greater that the maximum S-parameter data frequency.
	eesof.tm.agilent.com /docs/adsdoc15/cktsim/ck175.html (1608 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		To remind you: the CO drives the high frequency cut off: 20 GHz means that CO 1-0 enters the band if redshifted beyond z=5 and CO 2-1 enters beyond a redshift of z=10.
		India: Frequency cut off brings in CO beyond z=10, so somewhat compliant Ozlens: Too low a high frequency cut off Ozcyl: Frequency cut off brings in CO beyond z=10, so somewhat compliant USA: Need to study baseline distribution.
		Europe: Frequency range is hopeless for CO. India: Beginning to reach interesting upper frequency limit, and it might be that z > 10 is interesting by the time SKA is functioning, but further extension of the band is important.
	www-astro.physics.ox.ac.uk /~sr/ska/WG4_CO_pg.txt (541 words)

	IngentaConnect Tunnelling ionization of deep centres in high-frequency electric ... (Site not responding. Last check: 2007-11-06)
		The transition from the frequency-independent quasi-static limit to frequency-dependent tunnelling is determined by the tunnelling time which is, in the case of phonon-assisted tunnelling, controlled by the temperature.
		This transition to the high-frequency limit represents the boundary between semiclassical physics, where the radiation field has a classical amplitude, and full quantum mechanics where the radiation field is quantized and impurity ionization is caused by multiphoton processes.
		In both the quasi-static and the high-frequency limits, the application of an external magnetic field perpendicular to the electric field reduces the ionization probability when the cyclotron frequency becomes larger than the reciprocal tunnelling time and also shifts the boundary between the quasi-static and the frequency-dependent limits to higher frequencies.
	api.ingentaconnect.com /content/iop/jphyscm/2002/00000014/00000050/art00201 (464 words)

	High frequency of serious side effects from meglumine antimoniate given without an upper limit dose for the treatment ...
		High frequency of serious side effects from meglumine antimoniate given without an upper limit dose for the treatment of visceral leishmaniasis in human immunodeficiency virus type-1-infected patients -- Delgado et al.
		High frequency of serious side effects from meglumine antimoniate given without an upper limit dose for the treatment of visceral leishmaniasis in human immunodeficiency virus type-1-infected patients
		The dosing regimen of MA currently recommended for treating VL is associated with a high rate of serious side effects in HIV-1-infected patients.
	www.ajtmh.org /cgi/content/abstract/61/5/766 (248 words)

	Method for manufacturing a luminescent diode having a high frequency and high limit frequency for its modulation ...
		It is an object of the present invention to disclose a luminescent diode which has a high electro-optical efficiency for its respective emission frequency range, preferably in the infrared range and/or in the visible range, and/or which has a high cutoff modulation capability frequency, in particular of at least 5 MHz.
		The known constant decrease of concentration of the aluminum content in the layer 1 resulting during the epitaxial growth of the mixed crystal layer 1 on the substrate member 2 is based on the high distribution coefficient of the aluminum in the epitaxial growth from a aluminum-gallium-arsenic melt.
		Although various minor modifications may be suggested by those versed in the art, it should be understood that I wish to embody within the scope of the patent warranted hereon, all such embodiments as reasonably and properly come within the scope of my contribution to the art.
	www.freepatentsonline.com /4540451.html (1867 words)

	[No title]
		The ratio of output to input voltages is given by EMBED Equation.DSMT4 The analysis of this filter is complicated by the resistance of the inductor (RL).
		For this filter the high frequency limit is unity, but the low frequency limit is RL/(R+RL).
		Measure the ratio of Vout to Vin for frequencies of 10, 30, 100, 300, etc. to 100,000 Hz.
	www.udayton.edu /~physics/rlb/Phy333docs/ACCircuits.doc (561 words)

	High frequency limit of the Helmholtz equation II: source on a general smooth manifold (ResearchIndex)
		High frequency limit of the Helmholtz equation II: source on a general smooth manifold (ResearchIndex)
		High frequency limit of the Helmholtz equation II: source on a general smooth manifold
		2 High frequency limit of the Helmholtz equation (context) - Benamou, Castella et al.
	citeseer.ist.psu.edu /388342.html (285 words)

	Acoustic Propagation in Dispersions and the Geometric Theory of Diffraction
		Recently the authors have developed a low frequency (i.e., $Ka,La\ll1$) approach to the theory based on a potential theory technique.
		We show that the high frequency solution agrees well with both the experimental measurements and the exact solution in the region where $Ka
		As in the low frequency case, the high frequency solution may be applied to arbitrary scattering domains.
	epubs.siam.org /sam-bin/dbq/article/40467 (242 words)

	Limit article - Limit Limit (mathematics) Limit a function Limit a sequence (topology) - What-Means.com (Site not responding. Last check: 2007-11-06)
		Limit article - Limit Limit (mathematics) Limit a function Limit a sequence (topology) - What-Means.com
		If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.
		Limit article - Limit definition - what means Limit
	www.what-means.com /encyclopedia/Limit (95 words)

	Literatur-Abstract (Site not responding. Last check: 2007-11-06)
		In the limit of dilute suspensions the viscosity is modeled in terms of an effective hydrodynamic radius R H.
		The data indicate that the swollen network on the surface of the particles is partially drained at high frequencies.
		The high frequency shear modulus G'8 measured at high volume fractions demonstrates that the thermosensitive particles may be regarded as soft spheres.
	www.chem-bio.uni-karlsruhe.de /PI/Ballauff/Abstracts/deike2001.html (204 words)

	Clocks -- how they work; what they're for
		The signal generated by the clock is almost always a square waveform, that is, it outputs a certain voltage for T/2 units of time, and then another voltage for T/2 units of time, and repeats this cycle over and over.
		Essentially they have a clock doubler as part of the circuit; this may make them sensitive to the frequency of their input clock and they may only work for a certain frequency range.
		Adding a 1 of N reference frequency chooser and a 1 of M output source select chooser allows operation as a fixed clock driver or as a hybrid (most SVGAs are hybrids due to the presence of the compatibility clocks).
	mojo.calyx.net /~bri/projects/GGI/GGPG/clocks.html (1003 words)

	Veterinary Neurology and Neurosurgery Electrophysiology Notes-1. Changing High Frequency Sensitivity (Site not responding. Last check: 2007-11-06)
		Some low amplitude delta activity at about 1/sec is evident but it seems possible other slow activity is obscured by the artifacts.
		The artifacts have been nearly eliminated, allowing better visualization of the low frequency content of the recording.
		Note the delta and theta activity that was obscured or invisible before changing the frequency sensitivity.
	www.neurovet.org /Electrophysiology/Fig05.htm (120 words)

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