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Related to Characteristic frequency: normal frequencies

CF

The two-character ISO 3166 country code for CENTRAL AFRICAN REPUBLIC.

Cf

1. On a bond transaction table, an abbreviation indicating that a bond has matured, but is still trading.

2. ISO 3166-1 alpha-2 code for the Central African Republic. This is the code used in international transactions to and from Central African bank accounts.

3. ISO 3166-2 geocode for the Central African Republic. This is used as an international standard for shipping to the Central African Republic. The capital and each prefecture have their own codes with the prefix "CF." For example, the code for the Prefecture of Ouaka is ISO 3166-2:CF-UK.

cf

Used in bond transaction tables in newspapers to indicate that the certificate of a bond has matured but is still trading: VarCp 10s99cf.
References in periodicals archive ?
Minimum frequency is less consistent than characteristic frequency, because if there is a significant droop, or tail, after the characteristic frequency point, the extent to which this is detected becomes highly dependent on the distance to the bat.
In this case, the characteristic frequency [[omega].sub.max] is expressed as [2]
The conclusion (3) shows that the characteristic frequency [f.sub.T] of fault line is larger than the [f.sub.T] of healthy line in this fault condition.
Because [[omega].sub.c] = 1 / [tau] the characteristic frequency can be obtained and plugged into Eq.
If the broken bar fault is present, a pulsation is present in the modulus of the analytic signal, with the characteristic frequency of the machine fault:
The fault characteristic frequency at [f.sub.1] + [f.sub.0] is visible and the other fault-related component at [f.sub.1] + [f.sub.1] + [f.sub.0] can also be noticed in the faulty spectrum (Figure 5(b)).
Step 4: Applying spectrum analysis to the instantaneous amplitude of PF component including dominant feature information and extracte the fault characteristic frequency of the roller bearing.
In optimal-slip-estimation module, based on the real speed, the inverter excitation frequency, and torque-speed characteristic curve of squirrel-cage motor with different load types, the motor slip is calculated and the consequent optimal slip estimation value is transmitted to fault characteristic frequency determination module, where characteristic frequencies of broken rotor bars are calculated.
In this case, the effective plasma frequency is redefined as a characteristic frequency at which [epsilon.sub.eff] (w) = 0.
The scientists determined the characteristic frequency with which very cold magnesium atoms can be excited to a particular long-lived state, by a measurement from PTB via 73 km optical fiber.
Using intensity of increased amplitudes on characteristic frequency components interval of influence factors and frequency of mentioned defects was obtained.
Another instrumentation characteristic that comes into the model is a characteristic frequency of the sensor.

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