Author: Paul H. CarrPublisher:
ISBN:
Category : Acoustic paramagnetic resonance
Languages : en
Pages : 12
Book Description
Harmonic Generation of Microwave Phonons in Quartz
Author: Paul H. CarrPublisher:
ISBN:
Category : Acoustic paramagnetic resonance
Languages : en
Pages : 12
Book Description
Harmonic Generation of Microwave Phonons
Author: Paul Henry CarrPublisher:
ISBN:
Category : Acoustics
Languages : en
Pages : 114
Book Description
The ability to produce coherent phonons of microwave frequency provides a much needed means of investigating fundamental phenomena in solid state physics at frequencies never before attained. It is shown for the first time that second and third harmonics of the fundamental acoustic wave are also generated. The fact that the secondharmonic acoustic power was observed to be proportional to the square of the fundamental and the third-harmonic acoustic power proportional to the cube of the fundamental establishes the nonlinearity of the generation mechanism. Second-harmonic generation of longitudinal phonons in nonpiezoelectric Z-cut quartz was observed. The generation mechanism is common to all dielectric media. This demonstrates that coherent phonon generation is not restricted to relatively rare piezoelectric materials. The highest frequency at which microwave phonons can be generated is limited to 80 Gcps by present-day highpower microwave sources. The successful generation of harmonics of microwave phonons enhances the possibility of extending the present limit well into the millimeter range. Fundamental research of this type can lead to such practical control devices as microwave delay lines since the acoustic delay time of one centimeter of quartz is the same as that of 500 meters of waveguide. (Author).
Harmonic Generation of Microwave Phonons by Radiation Pressure and by the Phonon Phonon Interaction
Author: Paul H. CarrPublisher:
ISBN:
Category : Microwaves
Languages : en
Pages : 16
Book Description
Phonon Generation by Stripe-domain Resonance in Permalloy Films
Author: Marden H. SeaveyPublisher:
ISBN:
Category : Acoustic paramagnetic resonance
Languages : en
Pages : 14
Book Description
Hydromagnetic Ionizing Waves
Author: Allen G. RubinPublisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 26
Book Description
A theory of hydromagnetic ionizing waves has been developed which is valid in the region in which gas pressure is negligible, compared with magnetic pressure. The theory takes into account the energy expended in partial ionization of the gas behind the wave. The usual high conductivity boundary condition behind the wave is not employed. The electric field in front of the wave is taken as a parameter. Results of this theory are compared with available experimental measurements, and show good agreement. (Author).
Plurality-count Diversity Combining for Fading M-ary Transmissions
Author: John N. PiercePublisher:
ISBN:
Category : Alphabets
Languages : en
Pages : 38
Book Description
The performance of a plurality-count diversity combiner for fading M-ary transmissions is analyzed, and calculated error probabilities are presented graphically for alphabet sizes of 2, 8, and 32. The performance is shown to be within 3 dB of that of an optimum square-law combiner for moderate alphabet sizes when there is no restriction on the allowable number of diversity branches. It is shown that a worthwhile saving in transmitted power can be effected by using nonbinary alphabets with plurality-count combining for the transmission of binary data. The availability of extra information from the combiner for use with error-correction is discussed.
A Proposed Method for the Determination of the Standard Free Energy of Formation of a Double Oxide by a Mass Spectrometer
Author: J. SmiltensPublisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 12
Book Description
An equation for determination of the standard free energy of formation of a double oxide by means of a mass spectrometer has been derived. The quantities required by the equation are (1) the ratio of the intensities of an ion and (2) the ratio of the oxygen pressures at two equilibriums involving the double oxide and the constituent oxides. (Author).
Expansion of Initial High-current Spark Channels
Author: Heinz FischerPublisher:
ISBN:
Category : Electric spark
Languages : en
Pages : 16
Book Description
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of DocumentsPublisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1320
Book Description
Helium Continuum Afterglow in the Vacuum Ultraviolet
Author: Robert E. HuffmanPublisher:
ISBN:
Category : Afterglow (Physics)
Languages : en
Pages : 12
Book Description
