Their work on very high frequency radiowaves 出自-2013年12月听力原文 In the deaf culture of North America, many listeners show applause not by clapping their hands but bywavingthem in the air. 出自-2011年12月听力原文 And the appearance of new-born giants suggests that newcomers can makewaves...
Waves come in two kinds, longitudinal and transverse.Transverse wavesare like those on water, with the surface going up and down, andlongitudinal wavesare like of those of sound, consisting of alternating compressions and rarefactions in a medium. The high point of a transverse wave is a calle...
It was found that v(ω) and ε′(ω) dispersed at lower frequency, but became stable at high frequency regions, which agrees with the classical GPR plateau. The same frequency components at different nominal antenna frequencies show a close range of v(ω) and ε′(ω) in concrete of ...
The influence of highly regular, anisotropic, microstructured materials on high frequencyultrasonic wave propagation was investigated in this work. Microstructure, often only treated asa source of scattering, significantly influences high frequency ultrasonic waves, resulting inunexpected guided wave modes. Tis...
A New High-frequency High-sensitivity SAW Device for NO_2 Gas Detection in the Sub-ppm Range First measurements are made with two classes of NO 2 -sensitive films: evaporated lead phthalocyanine layers from 1 to 15 nm thick and Langmuir—Blodgett (... M Rapp,D Binz,I Kabbe,... - 《...
Waves of change in reflection and conduction (WCRC)was found in 1992. Since that time, this multidimensional wave structure of solitonic types manifests it... EM Kudriavtsev - Laser-induced Damage in Optical Materials 被引量: 6发表: 2002年 Analytic description of Raman-induced frequency shift...
definitefrequencyof oscillation. In the latter case thewavesmay be progressive, in which the crests and troughs appear to travel at a steady speed in a direction at right angles to themselves. Alternatively, they may be standing waves, in which there is no progression. In this case, there ...
The observed high-frequency internal waves match the occasional density stratification observed in 1-m-thin layers using previous shipborne conductivity鈥搕emperature鈥揹epth measurements. Such layers and waves are relatively unusual in the deep Mediterranean, where commonly several hundreds-of-meters-...
Correlative measurements of temperature and winds by Na lidar and brightness in OH and O Atmospheric band airglow have been made at Albuquerque, NM and Maui, HI for a study of high frequency (period less than 30 minutes) Atmospheric Gravity Waves. Wave studies from four nights have been made...
radio frequency n.无线电频率 high frequency a. 高频的 hyper high frequency 超高频 ultra high frequency 【电】 超高频 propagation n.[U] 1. 传播;宣传 2. 繁殖;增值 radio n. 1.收音机,无线电设备 2.无线电广播台 3.无线电,无线电传送,无线电广播 4.无线电收发报机 v.[I,T] 1.用无...