共查询到20条相似文献,搜索用时 0 毫秒
1.
B. G. Yemets 《International Journal of Infrared and Millimeter Waves》2000,21(5):787-791
We discuss an experimental evidence for a decrease in the volume of air dissolved in water caused by millimeter electromagnetic waves of low intensity. The changes obtained were much greater than the expected conditioned by a pure thermal effect. The result observed is explained by air bubbles that take an active part in a mechanism of withdrawing dissolved air from water. The variation of restoring the dissolved air volume up to an equilibrium level after ceasing irradiation of water by millimeter waves was investigated as well. 相似文献
2.
B. G. Yemets 《International Journal of Infrared and Millimeter Waves》2001,22(4):639-643
The two-stage mechanism is offered, on which the millimeter waves rises concentration of free air in water. At first, millimeter waves localize heating in a volume of the sample, creating supersaturated concentration of the dissolved air in a fluid. Then superfluous air diffuses in embryonic microbubbles present in a fluid. The experimental data confirm the mechanism suggested. 相似文献
3.
B. G. Yemets 《International Journal of Infrared and Millimeter Waves》1998,19(11):1587-1593
The process of the ions transport through the biological membrane is considered. A role of air microbubbles efficiently mixing a near-membrane liquid layer in the presence of a temperature gradient is pointed out. These circumstances result in lowering an energy barrier height of the transmembrane ion-transport. It is shown that even low-level irradiation by the millimeter waves creates the temperature gradient, which is enough for effective mixing of near-membrane liquid's layer. It is demonstrated that a process of restoration an equilibrium air-distribution in the intercellar medium after ceasing the microwave irradiation proceeds according to the diffusion mechanism, i.e. rather slow. 相似文献
4.
A. Laurinaviius T. Anbinderis O. Martjanova J. Priutov A. Abrutis A. Teierskis 《International Journal of Infrared and Millimeter Waves》2001,22(7):961-964
Millimeter wave bridge technique for nondestructive material homogeneity characterization is described. The idea of this technique is the local excitation of millimeter waves in testing material and the measurement of the transmitted amplitude and phase in it different places. Some results of the homogeneity measurements for the dielectric substrates are presented. 相似文献
5.
Jiying Huang Yingle Li Xuewen Ma 《International Journal of Infrared and Millimeter Waves》2002,23(9):1399-1405
The size distribution and canting angle distribution for non-spherical rain drops are taken into account. Utilizing the Muller matrix, the backscattering power densities are computed at different rain rate and different polarization in millimeter waves band, according the rainfall condition in Xi'an, China. Finally the results obtained are discussed. 相似文献
6.
. Kancleris A. Laurinaviius T. Anbinderis 《International Journal of Infrared and Millimeter Waves》2004,25(7):1099-1108
A plane electromagnetic wave normally falling on a surface of a dielectric plate has been considered to investigate the sensitivity of the dielectric constant homogeneity mapping in the dielectric wafer by measuring the phase and/or the amplitude of the millimeter wave reflected from or transmitted through it. Measurement conditions at which the highest sensitivity might be achieved are established. The sensitivity at Fabry-Perot resonance conditions as well as at frequency shifted from resonance has been considered. 相似文献
7.
. Kancleris A. Laurinaviius T. Anbinderis 《International Journal of Infrared and Millimeter Waves》2004,25(11):1633-1644
The homogeneity mapping by measuring the phase or the amplitude of millimeter wave reflected from or transmitted through the semiconducting wafer is considered. The sensitivity of the conductivity homogeneity mapping is determined and conditions at which conductivity inhomogeneities can be distinguished from dielectric constant inhomogeneities are established. 相似文献
8.
Yingle Li Jiying Huang Ruike Yang 《International Journal of Infrared and Millimeter Waves》2002,23(3):435-443
Dust storms and turbulence consist of a random medium system, its effects on milimeter waves propagation are studied. Attenuation of millimeter waves, its phase shift and cross- polar discrimination are presented. Results show that dust storms mainly effects XPD and phase shift of millimeter waves, turbulence chiefly produces attenuation, in mediocre fluctuation. 相似文献
9.
Zhang Jing Luo Ye Xiong Lizhi 《International Journal of Infrared and Millimeter Waves》2003,24(3):367-375
The improved PML absorbing boundary condition have been introduced in this paper. The reflection coefficient of the absorbing boundary condition is less than the reflection coefficient of Berenger's PML algorithm. And in order to validate the theory and its effectiveness, We have applied the absorbing boundary condition to the calculation of microwave and millimeter waves circuit and get its reflection coefficient S
11. The numerical result is shown in this paper. 相似文献
10.
Fuyong Xu Keyu Zhao Bin You Xiaohui Lin 《International Journal of Infrared and Millimeter Waves》2000,21(1):45-56
In this paper, the transmission properties such as the dispersion and attenuation characteristics for the dominant mode of the trapezoidal-groove waveguide with arbitrarily inclined angle are analyzed and discussed by using the mode-matching method. Some calculated results are in very good agreement with the published data. The obtained conclusions are of important significance in theoretical studies and actual applications of trapezoidal-groove waveguides for millimeter and submillimeter waves. 相似文献
11.
S. Koshevaya I. Moroz V. Grimalsky M. Tecpoyotl-Torres J. Escobedo-Alatorre J. Sánchez-Mondragón 《International Journal of Infrared and Millimeter Waves》2005,26(3):387-408
Volume and based on surface oriented integrated p-i-n-structures modulators have demonstrated high efficiency in millimeter wave range as quasi-optical modulators and phase shifters. These structures possess high modulation and high-speed properties; sustain great EM powers. However, the modulation characteristics of p-i-n modulators of both mentioned types in millimeter wave range have not been investigated yet. Here, a comparison and criteria of volume and integrated based on Si surface oriented structure modulators in millimeter wave range are presented. 相似文献
12.
Fuyong Xu Changping Shangguan 《International Journal of Infrared and Millimeter Waves》2002,23(11):1649-1658
A characteristic equation and impedance characteristic for the dominant mode of closed elliptic-groove guide have been analyzed and discussed by using the mode-matching method. The reference size of the closed elliptic-groove guide for the good impedance matching with rectangular guide in actual application is given. The obtained conclusions are of important significance in theoretical studies and actual applications of closed elliptic-groove guide for millimeter waves. 相似文献
13.
S. P. Gavrilov A. A. Vertiy S. R. Samedov B. Tansel 《International Journal of Infrared and Millimeter Waves》1998,19(10):1353-1365
It is considered and offered the waveguide band elimination filter with the working mode H10 that can be used in millimeter waves devices such as up, down- converters, mixer, etc. The characteristics of the filter was calculated by using analogy in electromagnetic the waveguide propagation and optical the wave propagation in the medium with the specific refractive index N. This conception can be applied for party-filled waveguide in the case when the Brillouin decomposition of the waveguide waves into plane waves is correct and the transformation of the incident (propagating) mode into other the mode types is absent.In this work were calculated the spectrum energy transmittance T(f) in the filter stop band and the wavelength
0
in the center of this band using the characteristic equation obtained in the result of theoretical consideration. Theoretical results are compared with experimental measurements. 相似文献
14.
Fuyong Xu Keyu Zhao Xuenong Tian 《International Journal of Infrared and Millimeter Waves》2000,21(7):1119-1129
The transmission characteristics of the mode TE11 for a new type of closed trapezoidal-groove guide with arbitrary inclined angle are analysed in detail with the mode-matching method in this paper. The calculated results are in good agreement with the experimental values in the published reference. The dispersion of the closed trapezoidal-groove guide is very low. The relationships of the cut-off wavelength and the attenuation constant with the structural sizes of the closed trapezoidal-groove waveguide are also obtained. The given results have very important value in study, design, manufacture and application for closed trapezoidal-groove waveguide. 相似文献
15.
Fuyong Xu Jiao Li Keyu Zhao 《International Journal of Infrared and Millimeter Waves》1998,19(12):1745-1757
In this paper, a new type of horizontal-flat and vertical-flat closed elliptic-groove guides is firstly presented. The field components and characteristic equations for some main transmission modes of the closed elliptic-groove guides are derived by with the help of the mode-matching method and Mathieu function. The variations of the cut-off wavelengths along with eccentricities, widths and lengths of the parallel plates for a number of lower order transmission modes of the closed elliptic-groove guides are also analysed in detail. The calculated results in good agreement with ones in the relevant references are of very important values in theoretical researches and actual applications of closed elliptic-groove guides for millimeter and submillimeter waves. 相似文献
16.
P. Laurêncio H. Vargues I. Fortes R. Avó M. C. R. Medeiros 《Fiber and Integrated Optics》2013,32(6):441-452
Abstract The performance degradation caused by transmission along dispersive single-mode fibers of optically generated millimeter-wave signals using up-conversion is theoretically assessed and validated by numerical simulation. Up-conversion techniques based on optical double sideband, optical single sideband, and optical carrier suppression are considered. The generation of 60 GHz by frequency tripling using the optical single sideband is shown to be particularly tolerant to the fiber dispersion. The practical imbalance of Mach-Zehnder modulators is taken into account for optical carrier suppression modulation, where the finite extinction ratio is found to increase tolerance to fiber dispersion. 相似文献
17.
18.
Fuyong Xu Bin You Yue-e Li Keyu Zhao 《International Journal of Infrared and Millimeter Waves》2002,23(10):1545-1556
The modes TE and TM of arbitrarily trapezoidal-groove guide are analyzed by using the mode-matching method. The mode TE11 is the dominant mode of the trapezoidal-groove guide under different conditions. The bandwidth characteristic and the operation condition for the single dominant mode are discussed. The obtained conclusions are of very important significance in theoretical study and practical application of trapeziodal-groove guides for millimeter waves. 相似文献
19.
A pattern of spots of light projected on to a semiconductor wafer creates an array of scatterers that can diffract millimeter-wavelength surface waves through 90° in agreement with the expression for Bragg reflection. 相似文献
20.
推导出了基于高斯分布的毫米波的功率分布函数,并分别根据传统的pennes方程和新提出的HBHE方程以及毫米波在动物皮肤内的传播特性,建立了33.5 GHz毫米波不同辐照强度下的大鼠皮肤的非稳态多层传热模型,在二维柱坐标下进行离散计算,得到了长时间辐照条件的温度变化规律,并将理论结果与实验数据进行了比较,发现HBHE的结果与实测结果更为吻合,特别是在高功率条件辐照下,与实测结果基本一致,验证该理论模型的优越性。 相似文献