High-frequency - Factbites

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Topic: High-frequency

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	Very high frequency - Encyclopedia.WorldSearch
		Unlike high frequencies (HF), the ionosphere does not usually reflect VHF radio and thus transmissions are restricted to the local area (and don't interfere with transmissions thousands of kilometres away).
		Frequencies immediately below VHF is HF, and the next higher frequencies are known as Ultra high frequency (UHF).
		Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m).
	encyclopedia.worldsearch.com /very_high_frequency.htm

	Ultra high frequency - Wikipedia, the free encyclopedia
		Ultra high frequency (UHF) designates a range (band) of electromagnetic waves whose frequency is between 300 MHz (Wavelength 1 meter) and 3.0 GHz (Wavelength 10 centimetres).
		Waves whose frequency is above the UHF band fall into the microwave or higher bands, while lower frequency signals fall into the VHF or lower bands.
		Modern mobile phones also transmit and receive within the UHF spectrum, and UHF is widely used for two-way radio communication (usually using narrowband frequency modulation, but digital services are on the rise) by both public service agencies and the general public.
	en.wikipedia.org /wiki/Ultra_high_frequency

	High Frequency Words
		Have a student write a high frequency word you know he or she can write as part of an interactive writing lesson with the whole class or a small group of children with similar needs.
		High frequency words can be taught through reading and writing instruction to large groups, small groups or individuals throughout the day.
		It is important to help students see that the high frequency words they are learning to read are the same words they are trying to write in their stories.
	www.madison.k12.wi.us /tnl/langarts/hifreqwds.htm

	Pitch and Frequency
		Because sound waves are longitudinal waves which produce high- and low-pressure disturbances of the particles of a medium at a given frequency, the ear has an ability to detect such frequencies and associate them with the pitch of the sound.
		When two sounds with a frequency difference of greater than 7 Hz are played simultaneously, most people are capable of detecting the presence of a complex wave pattern resulting from the interference and superposition of the two sound waves.
		The frequency of a wave is measured as the number of complete back-and-forth vibrations of a particle of the medium per unit of time.
	www.glenbrook.k12.il.us /gbssci/phys/Class/sound/u11l2a.html

	High Frequency Treatment
		A high frequency "rake" is also used on the scalp to improve circulation, kill bacteria and clear up symptoms of seborrhea, psoriasis, and dandruff.
		High frequency also aids in deeper penetration of skin serums and other skincare products into the skin.
	www.epidermsalon.com /services/frequency.htm

	Department of Neonatal Medicine Protocol Book: acidosis
		The use of high frequency ventilation at low tidal volume allows the primary goals of ventilation, oxygenation and CO removal, to be achieved without the costs of pressure-induced lung injury.
		High frequency ventilation compared with conventional mechanical ventilation in the treatment of respiratory failure in preterm infants.
		High frequency oscillatory ventilation in respiratory distress syndrome.
	www.cs.nsw.gov.au /rpa/neonatal/html/newprot/hfov.htm

	High Frequency
		Because high frequency sensors are generally smaller and lighter weight than their general purpose or low frequency counterparts, they have the advantage of less mass loading (mounting of the sensor will have less tendency to change the vibration of the structure under test).
		High frequency accelerometers are used on machinery with gear mesh or small bearings such as high-speed machine tool spindles and compressors.
		As previously discussed there is little vibration in terms of displacement and velocity at high frequency; however tremendous amounts of acceleration amplitudes may be present.
	www.wilcoxon.com /vi_index.cfm/CatS_ID=3/more=yes

	HF3 — The High Performance Ultraminiature High Frequency Relay
		High Frequency characteristics of electromechanical relays are not influenced by temperature
		For many high frequency applications like wireless telecommunication, CATV, ATE etc. relays are needed to switch these signals.
		The frequency of analog signals or the data rate of digital signals is continuously increasing.
	www.tycoelectronics.com /prodnews.asp?id=457

	Refulife Violet Ray 1919 Manual
		High Frequency is applied by a vacuum glass attachment called the electrode in which the High Frequency current shows in a violet colored glow.
		High Frequency Electricity is recommended by Physicians and used by Specialists as the only relief for these diseases of the skin.
		The primary action of High Frequency Violet Ray Electricity as generated by the Renulife Generator is to increase the circulation of the blood, when the vacuum electrodes are applied, there is soon produced a redness or hyperemia with all the resultant benefits of nutrition.
	www.meridianinstitute.com /eaem/renulife/book1/contents.html

	Adult High Frequency Ventilation
		High frequency jet ventilation in tandem with conventional volume ventilation for acute respiratory failure: a case report.
		High frequency jet ventilation: the influence of different methods of injection on respiratory parameters.
		High frequency ventilation: a report on a state of the art symposium.
	www.umdnj.edu /rspthweb/bibs/hfv_adlt.htm

	High Ejaculation Frequency May Be Linked To A Decreased Risk Of Prostate Cancer
		Ejaculation frequency, a measure of sexual activity, is not associated with a higher risk for prostate cancer, according to a study in the April 7 issue of The Journal of the American Medical Association (JAMA).
		Ejaculation frequency was assessed by asking participants to report the average number of ejaculations they had per month during the ages of 20 to 29 years, 40 to 49 years, and during the past year (1991).
		High Blood Testosterone Levels Associated With Increased Prostate Cancer Risk (May 10, 2004) -- Men over 50 years of age with high blood levels of testosterone have an increased risk of prostate cancer, according to a study by researchers at Johns Hopkins and the National Institute on Aging.
	www.sciencedaily.com /releases/2004/04/040408090927.htm

	High Voltage, High Frequency Power Supplies
		The high frequency also makes possible low storage energy voltage multiplier stacks for high voltage dc sources as well as being an excellent plasma driver when used direct.
		Output is end point grounded and is at a high frequency of 25 to 35 khz.
		High voltage, high frequency current limited power supplies.
	www.amazing1.com /hv-hf-power-supplies.htm

	Ultra high frequency - Wikipedia, the free encyclopedia
		Ultra high frequency (UHF) designates a range (band) of electromagnetic waves whose frequency is between 300 MHz (Wavelength 1 meter) and 3.0 GHz (Wavelength 10 centimetres).
		The main advantage of UHF transmission is that its high frequency means it has a physically short wave.
		UHF is also widely used in two-way radio systems and cordless phones due to the fact that since UHF signals essentially travel over line-of-sight distances, distant transmissions cannot travel far enough to interfere with local transmissions.
	en.wikipedia.org /wiki/Ultra_high_frequency (1088 words)

	High frequency - The Daily Orange - Pulp
		A prepubescent Steve Flamisch strode up to the so-called "Super Bowl of high school football" in a shirt and tie, with his hair slicked back.
		His peers at Toms River High School South were content to root for their team from the stands, but Flamisch had set his sights on the press box.
		At age 11, his frequent calls to sports announcers accrued $300 phone bills and a network of announcers that could rival the Career Center.
	www.dailyorange.com /news/2004/11/03/Pulp/High-Frequency-791086.shtml (1088 words)

	ASA 142nd Meeting Lay Language Papers - High-frequency Sound Treatment of Tinnitus
		High frequency bone conduction transducers were fabricated to deliver frequencies from 6 to 40 kHz.
		Encouraged by the limited but convincing findings that high frequency induced residual inhibition that lasted substantially longer than that from conventional masking, more extensive trials are underway to explore the efficacy of high frequency bone conduction treatment in central tinnitus.
		To test this, nine subjects with severely tinnitus was evaluated with a novel method of bone conduction delivery to stimulate residual high frequency receptors in the inner ear.
	www.acoustics.org /press/142nd/lenhardt.html (1088 words)

	Ultra High Frequency
		UHF frequencies have higher attenuation from atmospheric moisture and benefit less from 'bounce', or the reflection of signals off the ionosphere back to earth, when compared to VHF frequencies.
		Ultra high frequency (UHF) radio frequencies are those between 300 MHz and 3.0 GHz, which is higher than those of very high frequency (VHF).
		UHF and VHF are the most common frequency bands for television.
	www.wikiverse.org /ultra-high-frequency (1088 words)

	Ultra-High Frequency Transducers
		The 2402H ultra-high frequency transducer is engineered for tight pattern control and extremely high on-axis sensitivity for incredible clarity and crispness.
		Ultra-high frequency (UHF) transducers are designed to complement high-frequency compression drivers and extended-range cone transducers, thus providing the multi-way system with extended frequency range and fidelity.
		Designed for use as an ultra-high frequency driver in multi-element, wide range loudspeaker systems, the JBL Model 2404H delivers an unmatched combination of wide, tightly controlled dispersion, extended frequency response, high power capacity, and high efficiency.
	www.jblpro.com /pages/components/uhf_drvs.htm (1088 words)

	High Frequency Welding UK
		High Frequency Welding UK Speed Plastics manufactures a wide range of specialist products from flexible plastics such as PVC, polyurethane film, polyester and polyurethane coated textiles, used in the medical, surgical and furniture industries.
		Products are made to the highest specifications by high frequency electronic welding of materials and by the most complex and intricate tooling and finishing using modern equipment and techniques.
		For many years the company has been at the forefront of technology, manufacturing and developing defence and survival products on behalf of the Ministry of Defence and civilian medical evacuation authorities.
	www.speedplastics.co.uk (1088 words)

	High frequency titrators
		When a high-frequency (radio-frequency) electromagnetic field is applied to an electrolyte solution there are an absorption of energy and a change in dielectric constant of the solution, as predicted by Debye and Falkenhagen and as shown experimentally by several workers [2].
		When the electrolytic solution loads many types of high-frequency oscillators, the change in dielectric constant causes a change of frequency of the oscillator.
		The change of frequency of an oscillator due to the change of the electrolyte solution composition could be used to follow the titration process.
	chem.ch.huji.ac.il /~eugeniik/instruments/electrochemical/high_frequency_titrators.html (1088 words)

	High frequency
		High frequency (HF) radio frequencies are between 3 and 30 MHz.
		This program, Speaking High Frequency German is the best that I have fo...
		High Frequency Techniques : An Introduction to RF and Microwave Engineering
	www.freeglossary.com /High_frequency (1088 words)

	New High-Order, High-Frequency Methods in Computational Electromagnetism
		These methods, which are based on integral equations, high-order integration, fast Fourier transforms and highly accurate high-frequency methods, can be used in the solution of problems of electromagnetic and acoustic scattering by surfaces and penetrable scatterers --- even in cases in which the scatterers contain geometric singularities such as corners and edges.
		A class of high-order high-frequency methods which we developed recently, finally, are efficient where our direct methods become costly, thus leading to a general and accurate computational methodology which is applicable and accurate for the whole range of frequencies in the electromagnetic spectrum.
		In all cases the solvers exhibit high-order convergence, they run on low memories and reduced operation counts, and they result in solutions with a high degree of accuracy.
	www.nd.edu /~cam/seminars/bruno.htm (1088 words)

	=== Oscilloscopes high frequency digital oscilloscope design ===
		Our high frequency digital oscilloscope design site is relatively new so we have not yet managed to add lots of data, but what we have done so far is researched the very best high frequency digital oscilloscope design sites on the net.
		While the growth of online commerce accelerates high frequency digital oscilloscope design sites are improving The main benefit that Internet based high frequency digital oscilloscope design retailers have over traditional high frequency digital oscilloscope design shops is that the operating costs are greatly reduced for many reasons.
		Choosing the most appropriate high frequency digital oscilloscope design e-commerce portals is not easy.
	www.sightings-in1.com /oscilloscopes/high-frequency-digital-oscilloscope-design.htm (1088 words)

	Hy-Q International Australia - Introduction to High Frequency Oscillators
		High frequency crystal oscillator designs can be based on either high frequency fundamental crystals, overtone oscillators or multiplied output low frequency VCXO's or TCXO's using harmonic or PLL multipliers.
		The high frequency fundamental based designs are good for all parameters but these crystals are difficult to make and therefore expensive.
		The multiplied low frequency designs can offer the excellent temperature stability, or high pulling available from our low frequency range but at the expense of slightly reduced spectral purity.
	www.hy-q.com.au /oscillators/hf-intro.htm (1088 words)

	High Frequency - Anti Aging Cosmetics
		High Frequency is a drug free alternative to help alleviate the unsightly appearance and embarrassment of break outs.
		High frequency aids in the reduction of fine lines and wrinkles.
		Most products containing high levels of vitamins, AHA or glycolic acid are not selective in what they remove from the skin.
	www.sanandaworkbook.com /cosmetics.htm (1088 words)

	High-frequency radio and transformation Army
		RF energy on frequencies too high (usually above 10 mhz in daytime and five mhz at night) or angles too steep for existing ion-density conditions won’t be reflected back to earth and will continue into deep space.
		This antenna isn’t long enough to be a perfect match for the radio at all frequencies, and it’ll be shortened even more when the radio is manpacked and operated since it’s very difficult to carry even a lightweight radio with a 10-foot antenna.
		The radio is also capable of providing one, five or 10 watts of frequency-modulated signal on frequencies between 30 and 60 mhz.
	www.gordon.army.mil /AC/wintr01/HFIBCT.htm (1088 words)

	Introduction to Filters
		We can consider the frequency to be high when the large majority of current goes through the capacitor; i.e., when the magnitude of the capacitor impedance is much less than that of R
		Therefore this circuit is a high-pass filter (it passes high frequency signals, and blocks low frequency signals.
		To determine the response of a circuit to a sinusoidal signal as a function of frequency it is possible to generalize the concept of impedance to include capacitors and inductors.
	www.swarthmore.edu /NatSci/echeeve1/Ref/FilterBkgrnd/Filters.html (1088 words)

	High Frequency Economics
		High Frequency Economics was established in 1988 to provide institutional investors with independent analysis of the global markets.
		Our comprehensive economic research is read by investors, traders, speculators and analysts at 250 institutions in over 20 countries worldwide.
	www.hifreqecon.com (1088 words)

	Definition: extremely high frequency
		extremely high frequency (EHF): Frequencies from 30 GHz to 300 GHz.
	www.its.bldrdoc.gov /fs-1037/dir-015/_2128.htm (26 words)

	TTO Programs - High-frequency Active Auroral Research Project (HAARP)
		The current high frequency transmitting array has proven to be extremely reliable and flexible, and has shown the feasibility of the overall concept.
		However, results to date indicate that advanced applications-related research activities and new military system concept demonstrations envisioned under the program require that the high frequency transmitting capability at the site be increased from the present 960 kW level to the originally planned 3.6 MW level.
		To date, the facility has been developed to include a suite of optical and radio diagnostics and an advanced, modern, high frequency transmitting array that has a radiated power of 960 kW, about one-third of the 3.6MW called for in the original concept and plan.
	www.darpa.mil /tto/programs/haarp.html (26 words)

	ULTRADERM High Frequency (Violet Ray) Unit
		The ULTRADERM is an American-Made Professional Console-Type High Frequency Unit (aka Violet Ray), which has been mentioned MANY times by Researchers in the early part of the 20th Century, being developed originally by the GENIUS Scientist, Nikola Tesla.
		The ULTRADERM High Frequency Unit has a Console Cabinet with an adjustable Intensity Control and since the Electrode Holder/Handle is EXTERNAL, being separated from the Transformer, it can be used up to 60 mins.
		The ULTRADERM High Frequency Unit is a HIGH-Voltage and LOW Current source of HIGH Frequency (10,000+ Hertz) Electricity, providing a PLEASANT, TINGLING Sensation to the Skin and Scalp by it's ability to INCREASE Oxygenation in the form of Ozone (O
	healingtools.tripod.com /UHF.html (26 words)

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In the News (Wed 30 Dec 09)