From its measurement of the natural resonance frequency of caesium — which is used to define the second — NIST broadcasts time signals via longwave radio station WWVB at Fort Collins, Colorado, and shortwave radio stations WWV and WWVH, located at Fort Collins, Colorado and Kekaha, Hawaii, respectively.

From the expression for the Debye frequency for ν, we have

From basic image filter theory the angular cutoff frequency and the characteristic impedance of a low-pass constant k filter are given by ;

From the equations above, it can be seen that this actually changes the rate of frequency increase of a linear chirp ( multiplied by a constant ) so that the correlation of the original function with the reflected function is low.

From the point of view of the pitcher, the frequency remains constant ( whether he's throwing balls or transmitting microwaves ).

From 28 March 2010 the service to Shanghai resumed with a frequency of four times per week.

From the transfer function it can be determined that the cutoff frequency point f < sub > c </ sub > ( in hertz ) is at the frequency

From the plot, it can be seen that for frequencies well below the corner frequency, the circuit has an attenuation of 0 dB, corresponding to a unity pass band gain, i. e. the amplitude of the filter output equals the amplitude of the input.

From the perspective of dimensional analysis, the unit Hertz ( Hz ) is also correct, but in practice it is only used for ordinary frequency f, and almost never for ω.

From ITU, 1. 145 Spurious emission: Emission on a frequency or frequencies which are outside the

In his history of science fiction, Billion Year Spree, Brian Aldiss notes the frequency with which Ayesha's death in the pillar of fire has been imitated by later science fiction and fantasy writers: " From Haggard on, crumbling women, priestesses, or empresses-all symbols of women as Untouchable and Unmakeable-fill the pages of many a scientific romance ".

From the international amateur radio union region 1 monitoring system news letter ( April 2002 ): The lowest frequency was 18000 kHz, the highest frequency so far during the current solar cycle is 30500 kHz.

From an equipment perspective this primarily involves replacing radio equipment which operates on the now congested 2. 4GHz frequency range with more advanced radio equipment which operates on the less cluttered 5. 8GHz frequency band.

From this description, it appears that as one considers larger and larger primes, the frequency of a prime splitting completely approaches 1 / 2, and likewise for the primes that remain primes in Z. Dirichlet's theorem on arithmetic progressions demonstrates that this is indeed the case.

From September 1997 there were separate news services for Sussex and Surrey, and separate breakfast shows for both counties, using a split frequency system.

From 22 January 2003 to 4 April 2003 the Nürnberg telecommunication tower also served for the spreading of the program of megaradio on mediumwave frequency 945 kHz.

* FCC: Information On Human Exposure To Radio frequency Fields From Cellular and PCS Radio Transmitters

From the very beginnings of modular analog synthesizers, VCFs often include variable feedback which creates a response peak at a frequency just below the cutoff slope.

From a quantum perspective, Brillouin scattering is an interaction between an electromagnetic wave and a density wave ( photon-phonon scattering ), magnetic spin wave ( photon-magnon scattering ), or other low frequency quasiparticle.

From around 1962 to the present, the phenotype frequency of carbonaria has steadily fallen.

From the 1920s to the 1960s, strong economic growth, abundant natural resources and development of infrastruture, led to the arrival of even more Portuguese settlers.

From Kampong Cham the gradient slopes very gently, and inundation of areas along the river occurs at flood stage — June through November — through breaks in the natural levees that have built up along its course.

From the earliest settlement of the Cayman Islands, economic activity was hindered by isolation and a limited natural resource base.

From Aristotle until Darwin, the natural world was predominantly considered static and unchanging.

From the start, Albanian foreign affairs, customs, as well as natural resources came under direct control of Italy.

From the British point of view, it was regarded as highly desirable to keep Romania and its oil out of German hands ; since Germany had hardly any natural supplies of oil, the ability of the Royal Navy to successfully impose a blockade represented a British trump card both to deter war, and if necessary, win a war.

From the birth of geography as a science during the Greek classical period and until the late nineteenth century with the birth of anthropogeography or Human Geography, Geography was almost exclusively a natural science: the study of location and descriptive gazetteer of all places of the known world.

That reward is property, for of useful and active industry, property is the natural result .” From this simple reasoning he is able to present the conclusion that exclusive, as opposed to communal property, is to be preferred.

From the 1820s onward, American presidents and expansionists coveted the bay as a great natural harbor in the Pacific.

From 1744 to 1788, he wrote his monumental, which included everything known about the natural world up until that date.

From 2000 to 2005, NFL stadiums phased out AstroTurf in favor of natural grass or other surfaces which closely simulate grass, such as FieldTurf.

* From the 17th century onwards, it also became possible to use the term ' theology ' to refer to study of religious ideas and teachings that are not specifically Christian ( e. g., in the phrase ' Natural Theology ' which denoted theology based on reasoning from natural facts independent of specifically Christian revelation ), or that are specific to another religion ( see below ).

From 1900 to 1920 the university constructed many new facilities, including buildings for the dental and pharmacy programs, chemistry, natural sciences, Hill Auditorium, large hospital and library complexes, and two residence halls.

From this shared starting point social contract theorists seek to demonstrate, in different ways, why a rational individual would voluntarily consent to give up his or her natural freedom to obtain the benefits of political order.

From the 1880s to the 1930s the term continued to be applied to the panselectionist school of thought, which argued that natural selection was the main and perhaps sole cause of all evolution.

From a Darwinian perspective dreams would have to fulfill some kind of biological requirement or provide some benefit for natural selection to take place.

From the middle of May, Bruce's army had been assembling in the Tor Wood, an area providing good natural cover.

From 1770 until 1860, the rate of natural growth of North American slaves was much greater than for the population of any nation in Europe, and was nearly twice as rapid as that of England.

From its origins as totems or the stylized depiction of natural creatures, the Chinese dragon evolved to become a mythical animal.

From 1994-2005 natural growth was negative and the population decreased to 10. 2 million.

From 1960 to 1961, the combination of poor planning during the Great Leap Forward, political movements incited by the government, as well as unusual weather patterns and natural disasters resulted in widespread famine and many deaths.

From the 1st century BC through the modern era, the town had a significant military importance because the Alps rise abruptly to its immediate south, presenting a significant natural barrier.

Left ( From top to bottom ): Sun ; Natural things ; Shadows of natural things ; Fire ; Artificial objects ; Shadows of artificial objects ; Analogy level.