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Từ điển LongMan Dictionary
frequency
fre‧quen‧cy/ˈfriːkwənsi/ noun (plural frequencies) [Word Family: verb: frequent; noun: frequency ≠ infrequency; adverb: frequently ≠ infrequently; adjective: frequent ≠ infrequent] 1. [UNCOUNTABLE] the number of times that something happens within a particular period of time or within a particular group of people frequency of ▪ the frequency of serious road accidents the high/low frequency (of something) ▪ the higher frequency of diabetes in older people ▪ Side effects from prescribed drugs are being reported with increasing frequency (=more and more often). ▪ The relative frequency of fraternal twins has halved since 1950.
2. [UNCOUNTABLE] the fact that something happens a lot SYN regularity: ▪ Businesses come and go with alarming frequency.
3. [UNCOUNTABLE AND COUNTABLE] technical the number of radio waves, sound waves etc that pass any point per second: ▪ This station broadcasts on three different frequencies. high/low frequency ▪ Dolphins produce a high frequency sound. ▪ the frequency range of the human ear
noun COLLOCATIONS FROM CORPUS ADJECTIVE angular ▪ Here is the wavelength and is the angular frequency of the wave. constant ▪ The sequence generator produces the phase control signals and is triggered by step command pulses from a constant frequency clock. ▪ Radio used for communication uses a constant frequency carrier with some kind of amplitude modulation. ▪ The stepping rate is fixed by a constant frequency clock, which is controlled by a one-bit signal from the microprocessor. critical ▪ Below a certain critical frequency no electrons were ejected, however intense the radiation. ▪ When m 0.6, the input resistance remains close to for frequencies up to 85% of the critical frequency. ▪ Making the characteristic impedances of the constant-k and m-derived filter sections identical also ensures that their critical frequencies are the same. ▪ They also adversely affect the rate at which the attenuation changes with frequency near critical frequencies. ▪ The parameter m is often chosen to be 0.3 which separates the resonant frequency by about 5% from the critical frequency. ▪ The m-derived section is arranged to exhibit the same characteristic impedance and critical frequency or frequencies as the prototype. ▪ All we can say in general is that there is a critical frequency, a knife-edge. different ▪ These levels vibrate at different frequencies. ▪ It may be possible to identify two or more teaching styles based on different frequencies of use of the activity groups. ▪ Another amazing fact is that crystals actually vibrate at different frequencies when they come into contact with other energy fields. ▪ They occupy a variety of different sites and orientations; molecules in different sites absorb at different frequencies. ▪ The periods differ, so the buildings vibrate with different frequencies and slap against each other. ▪ It is preferable to treat different samples with different frequencies and amplitudes of vibration. ▪ Dispersive instruments use prisms or gratings to separate radiation of different frequencies, by refraction or diffraction. ▪ We might say we perceive them as separate because they vibrate at different frequencies. great ▪ It only differs from the category 1 species in the greater frequency of occurrence of digestion. ▪ And non-poor unmarried women are deciding to have and keep their babies with far greater frequency than in previous eras. ▪ This coincided with a greater frequency of direct attacks in harem takeovers. ▪ Earhart left, invitations to dine with Millie Otis in the state dining room came with greater frequency. ▪ When I was a small boy, quite serious fires seemed to occur in Salisbury with great frequency. ▪ The same rhetoric appears with great frequency in the description of the football scene. ▪ Prevalent winds are those which blow with the greatest frequency at any place. ▪ We have found no greater frequency of complaints of seasonal allergic-type symptoms in oilseed rape than in non-oilseed rape rural areas. high ▪ Sports participants have much higher frequencies of participation than do participants in other leisure activities such as the arts. ▪ Sometimes it shows up as a lot more wiggles in the higher frequency range, up around 25 to 70 Hertz. ▪ As age increases, the inner ear becomes less sensitive to high frequencies. ▪ In diamond, the chemical bonds are strong, favouring high frequencies of vibration. ▪ Digital mobiles witter noisily at high frequencies. ▪ The high frequency vibrations were so highly favoured that an infinite amount of energy would be present in them. ▪ Very high frequency direction finding is an aid to navigation. ▪ The high frequency of I as theme helps to maintain a sense of continuity and a coherent point of view. increased ▪ The issue is to estimate the marginal benefit from the increased frequency of screening examinations against the marginal increased cost. ▪ As some kidney cancers cause hypertension an increased frequency of kidney cancer is to be expected in a hypertension clinic. ▪ Impaired awareness of warning symptoms in patients transferred from animal insulins has been reported, risking increased frequency of severe hypoglycaemia. ▪ Consider the physiologist's intuition that an increased neuronal firing frequency explains increased intensity of experience. ▪ The increased frequency of malignant disease in this population is of importance in view of the major impact on overall management. low ▪ A problem arises with the design of such filters for passing or stopping low frequencies. ▪ How can we reconcile the low frequency of expressions of emotional involvement in election campaigns with the high frequency of antagonistic partisanship? ▪ Between these two maxima there is a lower frequency of depths representing the more shallow regions of the oceans. ▪ Like Pro Logic, it has three discrete front channels and a separate channel for low frequencies from the subwoofer. ▪ Band filters that can be tuned down to low frequencies are useful in a host of applications including electronic oscillators. ▪ White noise is not a good simulator of music, which contains more energy at low frequencies than at high ones. ▪ The cause is not signal splatter; the noise which annoys the deaf is at a much lower frequency. ▪ However, the weaker the magnetic field, the lower the frequency needed for a given ion mass. natural ▪ A gravitational wave at the natural frequency for longitudinal oscillations of the bar would set it ringing like a tuning fork. relative ▪ This amounts to a relative frequency decline of over 50%. ▪ Many causes of hyperuricemia have been recognized; however, gouty arthritis is seen with relative frequency in only a few conditions. ▪ The relative frequencies of citations may be inaccurate, if allowance is not made for the growth of the literature. ▪ It can also be seen that there is a negligible relationship between relative frequency and coverage. ▪ This can be done by comparing the relative frequency of use of different coding categories in the potential risks and description conditions. ▪ In computer indexing, this will involve statistical analysis of the relative frequency of occurrence of terms. ▪ Spearman's Rank-Order Correlation Coefficient was calculated to determine the correlation between relative frequency and coverage. ▪ The population will thus evolve, and the relative frequencies of different strategies will change. resonant ▪ The reflected signal is studied as a function of frequency and the resonant frequency, together with higher orders, is then measured. ▪ A range of frequencies wide enough to ensure that it encompasses the resonant frequency of the sample v r is then examined. ▪ The resonant frequency is detected as the maximum of a graph of amplitude against frequency. ▪ A cyclotron is fine-tuned to a resonant frequency specific to one chosen ion type. ▪ Table 1 shows the resonant cyclotron frequencies of single ions of different forms when subject to the steady geomagnetic field. ▪ The presence of other ions may raise the resonant frequency by up to 50%. ▪ The parameter m is often chosen to be 0.3 which separates the resonant frequency by about 5% from the critical frequency. NOUN band ▪ Similarly, pull-shifting the treble control lifts the operational frequency band and, again, moves the midrange automatically to compensate. ▪ In the observed spectrum we find that several low frequency bands shift on deuterium substitution. clock ▪ In this case high frequencies means anything above approximately half the clock frequency. ▪ Faster operating speeds can be obtained with a higher clock frequency and more stages of pulse deletion. ▪ Parsytec reckons the tests it has done on lower clock frequencies point to a six- to ten-fold performance increase over the T805. distribution ▪ Find the frequency distribution over years of study in 1991. ▪ The full array of such fractions, comprising a frequency distribution across all cultures sampled, is called an ethnographic curve. ▪ Using the unit cumulative normal frequency distribution we may compute confidence limits for our estimate of beta. ▪ It was assumed that any erosion terraces would show as modes in the frequency distribution. ▪ The plotting of frequency distributions of particular size ratios provides peaks which represent preferred forms. ▪ On the size frequency distribution plot the highest point on the curve provides the modal value. ▪ Method: A number of documents related to the domain of banking were collected, and a frequency distribution produced. radio ▪ The product is the result of an agreement signed in October 1991 for joint development of an FRAM-compatible radio frequency transponder chip. ▪ The latest is an outpatient procedure with a new gizmo that removes throat tissues with radio frequencies. ▪ They also found a piece of paper with the radio frequencies used by police locally and nationally, said Mr Cornwall. ▪ She wanted tactical call signs, authentication codes, radio frequencies. ▪ Radiation in the optical range and at radio frequencies can be detected either locally or at Earth stations. ▪ The technology handles multiple calls on a single radio frequency by separating them in time. ▪ The observed profiles were cross-correlated with a standard pulse profile appropriate for each radio frequency to obtain accurate pulse arrival times. ▪ It then encodes them and transmits the conversation over a range of radio frequencies. range ▪ The world's first machine capable of recording the full frequency range of the human ear. ▪ Then the computer sorts all the surnames into what we call frequency ranges. ▪ The treble, middle and bass controls each have a secondary function to enhance their particular frequency ranges. ▪ Sometimes it shows up as a lot more wiggles in the higher frequency range, up around 25 to 70 Hertz. ▪ With care, about 12 harmonics may be obtained so that about an order of magnitude of frequency range is available. ▪ They operate in the same frequency range of the radio spectrum as analog cellular -- around 800 megahertz. ▪ Hazardous frequency range Cyclotron resonance by my theory only occurs if the hazardous frequency range lies with the exciting field. stool ▪ There was a reduction in her stool frequency, an improvement in her abdominal pain, and a less productive cough. ▪ Differentiation between remission/mild and moderate disease is mostly a function of stool frequency. ▪ To evaluate this parameter independently the mean stool frequency was calculated for each group at entry and during the study. ▪ High stool frequency, imperfect continence or the use of anti-diarrhoeal drugs was similar in all three groups. ▪ Median hospital stay, however, was the same and stool frequency in those with a functioning pouch were comparable. ▪ Most often the intervention did not change stool frequency or stool consistency, or both. vibration ▪ Ground-state vibration frequencies are obtained as shifts from the exciting frequency or from the vibrational origin of the electronic band. ▪ Indeed, no relationship between the vibration frequencies of different molecules is logically necessary. ▪ We have seen how the vibration frequencies may be observed and how each may be allocated to a particular symmetry species. ▪ Molecular vibrations therefore lead to oscillations of electric charge, with frequencies governed by the normal vibration frequencies of the system. ▪ As we have seen in Section 5.12, isotopic substitution can lead to changes in vibration frequencies. ▪ The minimum in the potential function is at a greater internuclear distance, and the vibration frequency is lower. ▪ The random differences in environment result in a range of different vibration frequencies, and so each vibration band is broadened. VERB based ▪ Monitoring would be based on the frequency of access to files, and the archiving policies of different types of information items. ▪ It may be possible to identify two or more teaching styles based on different frequencies of use of the activity groups. ▪ Preferences for partners are probably based on the frequency of reciprocation. ▪ To improve the efficiency of the analysis each rule in the grammar is ordered based on its frequency of use. determine ▪ R1 and C set the oscillator's frequency range, and R2 determines the circuit's frequency shift. increase ▪ The topographical setting of an urban area can increase the frequency and severity of adverse meteorological conditions. ▪ Personal secrets have turned into public issues and, with increasing frequency, public scandals. ▪ Sneezing comes early and with increasing frequency. ▪ Nevertheless, teachers may improve their effectiveness by increasing the frequency of positive responses while reducing the negative. ▪ As the wine took hold I glanced in her direction with increasing frequency, often to find her already looking at me. ▪ Anxiety and despair broke through it with increasing frequency. ▪ Another mechanism, called transposition, can also increase the frequency of one variant through the genome. ▪ It was, in other words, the kind of book you encounter with increased frequency as you move through college. measure ▪ You can measure the frequency of these sorts of behavioural anomalies. ▪ Each station will measure the amplitude, frequency and duration of ground vibrations. occur ▪ These signals may have been less predictive of the outcome because they occurred at higher frequencies at earlier stages in the conflicts. ▪ One-gigaton impact explosions occur with a frequency of one per ten thousand years. ▪ Hazardous frequency range Cyclotron resonance by my theory only occurs if the hazardous frequency range lies with the exciting field. ▪ The largest, a 103-megaton blast, occurs with an average frequency of one per two thousand years. ▪ Because of the way in which adults respond to infants, these early vocalisations occur with increasing frequency. ▪ An operant is a piece of behaviour which has a spontaneous nature which occurs at a predetermined frequency. ▪ Such private dealings, however, are not likely to occur with any frequency in modern solicitors' partnerships. ▪ Leakage occurred with equal frequency in both groups. reduce ▪ It would seem reasonable to assume that measures aimed at treating calculi in these patients may reduce the frequency of infection. ▪ It may reduce the frequency and severity of colds. ▪ Their aim was then to reduce both frequency and duration. ▪ Should the government reduce the actual frequency of tragedies, or should it simply make them less painfully obvious? ▪ When safe levels are attained consistently you may reduce the frequency of testing to once a week. ▪ As it grows older, you will probably have to reduce the frequency of feeds to one or two meals every day. ▪ Monitor and record the vital signs, reducing the frequency as the patient's conditions stabilizes. ▪ To reduce the frequency of use of this procedure two key areas in primary care could be addressed. show ▪ All have shown that the frequency of ventricular ectopic at this time is low. ▪ Clinical tests have shown this frequency gives the best balance between thorough cleaning and personal comfort. ▪ A possible list of management information, showing frequency and circulation, is given overleaf. ▪ The whelks may show frequency independent selection, choosing their favourite food regardless of that species' relative abundance. 2. use ▪ Languages vary tremendously in the type of conjunctions they prefer to use as well as the frequency with which they use such items. ▪ The system uses a sliding frequency guiding filter to regulate the speed of the soliton waves. ▪ Radio used for communication uses a constant frequency carrier with some kind of amplitude modulation. ▪ Instead, each airline was to be allowed to use its discretion as to frequency and capacity within reasonable grounds. ▪ No more than a few hundred of these are used with any frequency. ▪ The method has been used to study the frequency and temperature dependence of viscoelastic moduli for many years. ▪ All Governments use guillotines, but no Government have used them with the frequency of this Administration. EXAMPLES FROM OTHER ENTRIES ▪ Crimes of this type are happening with increasing frequency. ▪ Divorces are being initiated with more frequency by women. ▪ The frequency of mining accidents has steadily decreased over the past 20 years. ▪ The high frequency of cases of diarrhoea is attributable to poor food hygiene. EXAMPLES FROM CORPUS ▪ In many cases such measurements may not be available with spatial and temporal sampling frequencies that meet the demands of research programmes. ▪ It can also be seen that there is a negligible relationship between relative frequency and coverage. ▪ It may be possible to identify two or more teaching styles based on different frequencies of use of the activity groups. ▪ Listeners used two crystal sets tuned to the corresponding frequencies. ▪ Since then, police have been listening in to the frequency used by the gang. ▪ The frequency with which they make them varies. ▪ The transmitter offers thousands of radio frequency coded options for maximum security.
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