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wave matching
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  wave matching
0.05λ helical radiators and quarter-wave matching and branch circuits were designed for an array antenna with a 0.09λ radiator spacing, to obtain a superdirective radiation pattern at 900 MHz.
      
To realize a highly efficient small antenna, high-Tcsuperconducting thick films with zirconia cores are adopted in order to fabricate both a self-resonating small helical radiator and a quarter-wave matching circuit.
      
The calculations show that quartz spheres with quarter-wave matching layers, can exhibit good focusing properties down to a radius of about half a free space wavelength.
      
The potential use of small substrate lenses for coupling to antennas at millimeter wave frequencies is investigated by analyzing the focusing properties of dielectric spheres with quarter-wave matching layers.
      
The cap is 0.5mm thick, and it acts as a quarter-wave matching layer at 94GHz.
      
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Pile driving formulas and stress wave matching methods are commonly used to estimate the load capacity of piles. This paper investigates the feasibility of using neural networks to do this work. Neural networks attempt to simulate the process by which the human brain learns to discern patterns in arrays of data. The data used in this study were derived from actual pile driving records. The new method has been approved much more accurate and convinient than the traditional ones, as well as quite useful...

Pile driving formulas and stress wave matching methods are commonly used to estimate the load capacity of piles. This paper investigates the feasibility of using neural networks to do this work. Neural networks attempt to simulate the process by which the human brain learns to discern patterns in arrays of data. The data used in this study were derived from actual pile driving records. The new method has been approved much more accurate and convinient than the traditional ones, as well as quite useful in research and in practice.

测桩数据的后期处理分析目前有多种方法。本文讨论用BP网络法来分析桩基动测数据,通过对打桩记录和应力波法的分析表明,神经网络方法明显优于传统方法。

 
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