Analog pulse-based data telemetry is a novel technology that improves data transmission rate for spectrum efficient secure communication in high-volume wireless sensor applications. However, the analog pulse transmiss...
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ISBN:
(纸本)9781665424615
Analog pulse-based data telemetry is a novel technology that improves data transmission rate for spectrum efficient secure communication in high-volume wireless sensor applications. However, the analog pulse transmission technology suffers from proper orthogonal pulse generation, data modulation scheme, propagation media, and receiver detection techniques to decode the transmitted bits. This paper introduces a multi-bit data encoding scheme using a set of orthogonal pulses and their time delay factors. The energy-efficient pulse generation technique based on Modified Hermitian Polynomial is used to generate the orthogonal analog pulse set. The proposed analog pulse-based data compression and decompression schemes are validated using MATLAB Simulink packages. The results show that the proposed data modulation scheme increases the data transmission rate 1.5x n more compared to single bit transmission, where 'n' is the distinct pulse order, indicating the number of individual data channels. The proposed scheme shows an alternative solution for spectrum efficient wireless data transmission in high-density sensor networks.
Many studies suggest that the durability of glass-fiber-reinforced-polymer (GFRP) bars in a simulated concrete pore solution is very different than the same bars in an actual concrete environment. This study conducted...
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Many studies suggest that the durability of glass-fiber-reinforced-polymer (GFRP) bars in a simulated concrete pore solution is very different than the same bars in an actual concrete environment. This study conducted a comparative evaluation of the durability of GFRP bars in concrete and in simulated concrete environments by investigating their interlaminar shear strength. It focused on evaluating the physical, mechanical, and micro-structural properties of GFRP bars subjected to high moisture, saline, and alkaline environments. Bare GFRP bars and cement-embedded GFRP bars were immersed in solutions at different temperatures (23 degrees C, 60 degrees C, and 80 degrees C) and for different exposure times (28, 56, and 112 days). The results show that the percentage water uptake and the apparent diffusivity of the GFRP bars were strongly dependent on the type and temperature of the immersion solution. The interlaminar shear strength of the GFRP bars directly immersed in a solution degraded more significantly than those embedded in concrete and immersed. Moreover, the alkaline solution was more aggressive to the GFRP bars than tap water or saline solution, affecting bar fiber, matrix interface, and chemical structure. As a result of this study, master curves and time-shift factors were developed to correlate the retention of interlaminar shear strength from the accelerated aging test to the service life of GFRP bars in an actual concrete environment.
Starting with investigating the Meyer scaling function, the original Meyer bases are extended to the generalized Meyer wavelet by introducing a time-shift factor into Meyer scaling coefficient functions in this paper....
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ISBN:
(纸本)9783642024535
Starting with investigating the Meyer scaling function, the original Meyer bases are extended to the generalized Meyer wavelet by introducing a time-shift factor into Meyer scaling coefficient functions in this paper. These new wavelets not only inherit many basic properties of the classical Meyer wavelets, such as orthonomality, time-frequency localization and so on, but also improve some performances of the Meyer wavelets. In addition, the symmetry of the generalized Meyer wavelets is also discussed in the paper, and a series of generalized scaling coefficients are given for practical applications.
A simple method which for generalizing the classical orthonormal wavelets is presented using investigation of the simplest Haar scaling function. A new kind of orthonormal wavelets is constructed from a classical orth...
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A simple method which for generalizing the classical orthonormal wavelets is presented using investigation of the simplest Haar scaling function. A new kind of orthonormal wavelets is constructed from a classical orthonormal wavelets using the method proposed in this paper. These new wavelets inherit some basic properties of the corresponding classical wavelets, such as the orthonormality, the order of regularity, the time-frequency localization characteristics, and so on. meanwhile some performances of the new wavelets are improved. The generalized Haar wavelet, the generalized Shannon wavelet and the generalized Meyer wavelet, the generalized Daubechies wavelets are discussed emphatically. Finally, based on the new wavelet system, some fast algorithms for analytic wavelet transform analysis of real signals are studied.
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