OTTER
发表于 2025-3-25 03:38:42
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headlong
发表于 2025-3-25 10:36:08
https://doi.org/10.1007/978-3-663-02551-1tional radio, frequencies. This radiation is coherent, having a clearly defined frequency and spatial distribution of phase and polarization. In this respect, the field of microwave techniques has recently been extended into the infrared and visible regions and some consideration will also be given to this work.
NADIR
发表于 2025-3-25 15:12:49
Measurement Methods and Instruments for Microwave Frequencies,tional radio, frequencies. This radiation is coherent, having a clearly defined frequency and spatial distribution of phase and polarization. In this respect, the field of microwave techniques has recently been extended into the infrared and visible regions and some consideration will also be given to this work.
ascend
发表于 2025-3-25 18:26:21
Frequency and Time Measurements,surement of frequency is based upon time measurement. While certain instruments will measure either quantity with equal facility, many methods apply to the measurement of one or the other. Therefore, the sections dealing with actual measuring techniques will present separately frequency measurements and time measurements.
惰性气体
发表于 2025-3-25 20:16:59
Low Noise Amplification, outer space, from nerve fibers, or from the ocean floor. To detect these weak signals, one requires very sensitive receivers, and hence the ability to amplify these signals without, at the same time, introducing any appreciable amount of noise.
形上升才刺激
发表于 2025-3-26 01:47:10
Measurement Methods and Instruments for Microwave Frequencies,ch is shown in Fig. 1. Here, frequency is plotted as abscissa and free-space wavelength as ordinates, while, for future reference, the energy and equivalent temperature of corresponding photons are also included. Microwaves occupy a unique place in this spectrum because they are, as a rule, suscepti
KEGEL
发表于 2025-3-26 04:44:01
Messung von Magnetfeldern,ärts steht im allgemeinen die Frage der absoluten Meßgenauigkeit im Vordergrund. Die Auswahl der Methode richtet sich nach der zugelassenen Größe der Meßsonde und nach der geforderten Genauigkeit. Mit zunehmenden Forderungen steigt sehr schnell der technische und damit finanzielle Aufwand. Meist sin
作茧自缚
发表于 2025-3-26 10:36:13
Frequency and Time Measurements,interdependence of frequency and time interval requires that a standard of one be also a standard of the other. Similarly, it can be said that the measurement of frequency is based upon time measurement. While certain instruments will measure either quantity with equal facility, many methods apply t
GRACE
发表于 2025-3-26 14:02:54
Temperaturmessung,einflußten Erscheinungen bzw. Stoffeigenschaften zugänglich. Zu diesen gehören z.B. die thermische Ausdehnung gasförmiger, flüssiger oder fester Körper und die temperaturabhängige Änderung des elektrischen Widerstands metallischer Leiter. Mit jeder derartigen Erscheinung wäre die Aufstellung einer T
jumble
发表于 2025-3-26 17:34:03
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