分类： 电子与通信技术 >> 信息处理技术 分类： 工程与技术科学 >> 工程通用技术 分类： 机械工程 >> 机械工程其他学科 提交时间： 2022-02-08
摘要： The spectral leakage (SL) from windowing and the picket fence effect (PEF) from discretization have been among the standard contents in textbooks for many decades. The SL and PEF would cause the distortions in amplitude, frequency, and phase of signals, which have always been of concern, and attempts have been made to solve them. This paper proposes two novel decomposition theorems that can totally eliminate the SL and PEF, they could broaden the knowledge of signal processing. First, two generalized eigenvalue equations are constructed for multifrequency discrete real signals and complex signals. The two decomposition theorems are then proved. On these bases, exact decomposition methods for real and complex signals are proposed. For a noise-free multifrequency real signal with m sinusoidal components, the frequency, amplitude, and phase of each component can be exactly calculated by using just 4m1 discrete values and its second-order derivatives. For a multifrequency complex signal, only 2m1 discrete values and its first-order derivatives are needed. The numerical experiments show that the proposed methods have very high resolution, and the sampling rate does not necessarily obey the Nyquist sampling theorem. With noisy signals, the proposed methods have extraordinary accuracy.
分类： 生物学 >> 动物学 提交时间： 2017-10-10 合作期刊: 《动物营养学报》
摘要： 本试验旨在研究饲粮精氨酸（Arg）水平对肉鸡肉品质的影响。试验选用1日龄罗斯308肉鸡192只，公母各占1/2，按体重相近原则分成4个处理，每个处理8个重复，每个重复6只鸡。4个处理的饲粮在玉米-豆粕型基础饲粮中分别添加0（对照）、0.3％、0.6％、0.9％的L-Arg。试验期42 d。结果表明：饲粮Arg水平可线性提高肉鸡腿肌率（P<0.50），饲粮中添加0.6%Arg的肉鸡的腿肌率最高，可较对照处理提高12.08%。饲粮Arg水平有线性降低肉鸡腹脂率的趋势（P<0.10），饲粮中添加0.9%Arg的肉鸡的腹脂率最低，可较对照处理降低10.20%。饲粮Arg水平可线性降低腿肌中粗脂肪含量（P<0.01），其中饲粮中添加0.6%Arg的肉鸡腿肌中粗脂肪含量最低，可较对照处理降低21.64%。饲粮Arg水平对腿肌的硬度（P<0.01）、弹性（P<0.01）和胸肌的硬度（P<0.10）、弹性（P<0.05）呈先降低后升高的二次曲线变化，饲粮添加0.3%Arg时，肉鸡腿肌的弹性和胸肌的硬度、弹性可降低至最低，分别较对照处理降低了46.34%、10.24%、41.79%。饲粮Arg水平对肉鸡腿肌中C16:0、C16:1、C18:1、C18:0含量（P<0.05）和C20:0、C20:3含量（P<0.10）呈先降低后升高的二次曲线变化。饲粮添加0.6%Arg时，肉鸡腿肌中C16:0、C16:1、C18:1、C18:0、C20:0、C20:3含量最低，分别较对照处理降低了48.58%、52.67%、48.40%、46.72%、54.08%、34.29%。饲粮中适当添加Arg可提高肉鸡腿肌率，有降低肉鸡腹脂率的趋势，可降低肉鸡腿肌中粗脂肪和部分脂肪酸含量，降低腿肌、胸肌的硬度和弹性。
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