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In this paper, the impact of sapling movements on VHF and UHF radio channels is experimentally investigated in a tropical rainforest. The reported information is based on the analysis and modeling of continuous-wave (CW) envelope fading waveforms. It is found that the sapling movements can affect the radio-wave propagations and cause the variations on the received fields. Moreover, statistical analysis...
This paper proposes a different modeling technique for analyzing the microwave power sensor calibration by direct comparison transfer. The model is established by using signal flow graph together with non-touching loop rule analyses. The realization of the banded calibration system from 50 GHz to 110 GHz by WR15 and WR10 connections is also described.
In this paper, a low-dimensional atmosphere model with general circulation is researched. The model is the classical Lorenz-84 system combined with seasonal force. The stability and the chaotic behavior of the seasonal forcing model are studied. By means of the Lyapunov exponents, the bifurcation map, phase diagram and Poincare section, the dynamical behaviors of the system are described and various...
The quality of Software product is crucial, the research of software quality evaluation method, has always been a research hotspot in the area of software, this paper analyzed and studied problems and shortcomings of the existing fuzzy comprehensive evaluation algorithm model, and improved the original fuzzy comprehensive evaluation model in the software evaluation process, and from angle of the fuzzy...
According to literature review and a number of market research, there is an analysis about the characteristics of the domestic fragrance market. And then through the research on the consumption habits and attitudes, the result of qualitative and quantitative analysis based on the Logistic Model concludes the impact of the factors in four aspects on the willingness of purchasing perfume. According...
Statistical modeling of rainfall induced temporal variations in a foliage channel at VHF frequency is performed in this paper. With the help of the Akaike weight omegaj, Weibull and Rayleigh functions are identified as the two suitable models to describe the tap amplitude variations. The Weibull function is then used as the channel model to analyze the rainfall induced temporal variations in a foliage...
Near ground radio wave propagation is examined in a tropical plantation experimentally at VHF and UHF bands. The propagation loss with forest depth is empirically analyzed using an integrated model combining both the foliage induced effect and the ground effect. Several well-known empirical foliage models are compared and analyzed. It is observed that the fitted ITU-R model taking into account the...
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