Cycles per second

The cycle of oscillation is 0 to 2n, precisely the circumference of a circle. After one cycle of 2n radians is complete, another cycle begins, identical to the one before it. The angular frequency in radians co is related to the frequency expressed in units of complete cycles per second v as co = 2nv, whence... 

The modem unit, expressing frequency in cycles per second, is the hertz (Hz). 

The smallest unit (packet) of electromagnetic energy (a photon) is related to frequency by the formula, E = hv, in which E is the energy and h is Planck s constant. Alternatively, the relation can be written, E = hc/A,. Frequency (v) is a number with units of cycles per second (cps, the number of times a wavefront passes a given point in unit time, sec ) and is given the name Hertz (Hz), Planck s constant is a fundamental number, measured in J sec or erg-sec. 

The relaxation and creep experiments that were described in the preceding sections are known as transient experiments. They begin, run their course, and end. A different experimental approach, called a dynamic experiment, involves stresses and strains that vary periodically. Our concern will be with sinusoidal oscillations of frequency v in cycles per second (Hz) or co in radians per second. Remember that there are 2ir radians in a full cycle, so co = 2nv. The reciprocal of CO gives the period of the oscillation and defines the time scale of the experiment. In connection with the relaxation and creep experiments, we observed that the maximum viscoelastic effect was observed when the time scale of the experiment is close to r. At a fixed temperature and for a specific sample, r or the spectrum of r values is fixed. If it does not correspond to the time scale of a transient experiment, we will lose a considerable amount of information about the viscoelastic response of the system. In a dynamic experiment it may... 

Readings are on a weight of iodine per volume of solution basis cps = cycles per second of viscometer. Nycomed Imaging, as of 1996. 

Variable nozzles produce a series of jets of gas entering the rotor, and these impulses add up to form a frequency equal to the blade-passing frequency the number of revolutions per second multiplied by the number of nozzle vanes, which is of the order of thousands of cycles per second. Frequently the rotor will resonate at this frequency, and if it does, it will be fatigued and crack and break up thus these frequencies must be avoided, and the manufac turer should be asked to supply information to the customer on this subject. 

Its unit is hertz (s ), corresponding one cycle per second. Pure tone consists of one frequency, but normally all sounds are a mixture of many frequencies. In the audio range, frequency varies normally from 20 Hz to 16000 Hz. The size of the audio range depends on the sensitivity of the listener s ears. When the frequency is below 20 Hz, it is called infrasound, while for frequencies over 16000 Hz, it is called ultrasound. 

Frequency (Section 13.1) Number of waves per unit time. Although often expressed in hertz (Hz), or cycles per second, the SI unit for frequency is s . 

Hertz, n. hertz (frequency of one cycle per second), c.p.s. heruber, adv. over (here). 

H.Z., HZ, abbrev. (Hydrolysierzahl) hydrolyza-tion number (HertzzaW) Hertz unit, hertz (cycle per second). 

As expected, fans operate quietest at the point of maximum efficiency. The highest noise level will be for frequencies below 100 cycles per second. At the higher pressures, the fan should be selected in the region of peak efficiency for quiet operation. Table 12-17 presents some guide information for noise level with respect to fan operation. 

Volume Bottles Connected direcdy to compressor cylinders, volume botdes are empty vessels free of internal mechanical components. Usually these simple vessels do not properly reduce gas pulsadons. For a pulsadon-induced vibradon of f cycles per second, harmonics at 2-3 dmes f can be expected. 

After the anticipated disturbing frequencies have been determined, it is necessary to begin the sizing of the filter system. The cutoff frequency should be set at least one cycle per second below the lowest frequency to be filtered. The base frequency is determined from compressor speed and should be determined at the lowest anticipated compressor speed for variable-speed compressors. The following equation is used to determine cut-off frequency for a low-pass filter ... 

A vibration is a periodic motion or one that repeats itself after a certain interval of time. This time interval is referred to as the period of the vibration, T. A plot, or profile, of a vibration is shown in Figure 43.1, which shows the period, T, and the maximum displacement or amplitude, X - The inverse of the period, j, is called the frequency, f, of the vibration, which can be expressed in units of cycles per second (cps) or Hertz (Hz). A harmonic function is the simplest type of periodic motion and is shown in Figure 43.2, which is the harmonic function for the small oscillations of a simple pendulum. Such a relationship can be expressed by the equation ... 

The maximum value of the displacement is X, which is also called the amplitude. The period, T, is usually measured in seconds its reciprocal is the frequency of the vibration, /, measured in cycles per second (cps) or Hertz (Hz). 

Frequency (Section 12.5) The number of electromagnetic wave cycles that travel past a fixed point in a given unit of time. Frequencies are expressed in units of cycles per second. or hertz. 

The frequency unit hertz (Hz) represents one cycle per second. 

Hertz (Hz) A unit of frequency one cycle per second, 133 Hess, Germain, 207... 

Carbon monoxide absorbs light at frequencies near 1.2 X 10n, near 6.4 X 1013, and near 1.5 X 1014 cycles per second. It does not absorb at intermediate frequencies. 

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