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backward propagating
相关语句
  反向传播
     Compared to BP algorithm,it can be applied without the need of backward propagating the error throughout a feedback network. This important property makes it possible to design the simple neural network controller directly.
     与常用的BP算法相比 ,它不需要反馈网络反向传播误差 ,可以直接用来设计自适应神经网络控制器 ,使控制器的设计简单化。
短句来源
     Application of artificial neural net to geological mapping: setting up and utilization of backward propagating (BP net)model
     人工神经网络在区域地质调查中的应用——反向传播模型(BP网)建立与应用
短句来源
     An accurate model was used to predict the gain, saturation and noise characteristics of ytterbium doped fiber amplifiers (YDFA), pumped at λ p=910 nm. It was shown that the strong backward propagating ASE around 975 nm could dramatically increase the NF and limit the gain available at longer wavelength.
     模拟计算了在 910nm抽运下掺镱光纤放大器 (YDFA)的增益、饱和与噪声特性 ,分析表明 ,975nm处反向传播的ASE是抑制放大器小信号增益并影响其噪声性能的重要因素。
短句来源
     In the paper, the author made up artifical neural network computer program by means of utilizing forward multy-layer neural theory and adopting error backward propagating method, and applied artificial neural network to the design of propeller.
     笔者运用前向多层神经网络理论 ,采用误差反向传播方法 (BP法 )编制了人工神经网络计算机应用程序 ,将人工神经网络应用到船舶螺旋桨设计中 .
短句来源
     Plenty of samples is provided for training BP neural network by traditional design method and the topology structure is built using forward propagating data and backward propagating error data,which is applied to optimal design of parallel double broken line pulley in order to accomplish the mapping between main parameter of hoisting mechanism of gantry crane and the related parameters of parallel double broken line pulley. This is a new way to design key parts of crane featuring good design quality and high design efficiency.
     利用传统的设计方法为BP神经网络的学习提供足够样本集,然后通过正向传播和误差反向传播建立BP神经网络的拓扑结构,并将其应用于平行双折线卷筒的智能设计中,以完成龙门起重机起升机构主要设计参数与平行双折线卷筒相关参数的映射,提高设计的质量和效率,为龙门起重机关键零部件的智能设计提供一个新的途径。
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  “backward propagating”译为未确定词的双语例句
     The isolator suppresses the backward propagating amplified spontaneous emission and improves the gain and noise characteristics as well as the output signal power characteristics. It is shown that the gain improvement of about 5dB and the NF reduction of 1.6dB are expected.
     由于光隔离器有效地抑制了反向传输的放大自发幅射 ( ASE) ,从而改善了掺铒光纤放大器的增益、噪音系数和输出功率等性能 ,分析结果表明光隔离器加在最佳位置时 ,可使小信号增益提高约 5d B,噪音系数降低约 1 .6d B
短句来源
     The rate equation model is setup for analyzing two-stage erbium-doped fiber amplifiers (EDFA) . The isolator within EDFA suppresses the backward propagating amplified spontaneous emission and improves the gain and noise characteristics as well as the output signal power characteristics. The results show that the small signal gain can be increased 3dB, the noise coefficient has been decreased 1.0dB, nearly to quantum level.
     利用速率方程模型,对980nm泵浦带光隔离器的两段型掺铒光纤放大器(EDFA)的性能进行了研究,分析了增益、噪声系数、输出信号功率与泵浦光功率、输入信号光功率等参数之间的关系,结果表明小信号增益至少可提高3dB,噪声系数降低1.0dB,接近量子极限噪声系数。
短句来源
     The results show that the signal gain and noise figure are obviously improved due to the effective suppression of backward propagating amplified spontaneous emission (ASE) noise and the resulting consumption reduction of reversed particles by the isolator.
     结果表明,在给定泵浦方式、泵浦功率、纤芯掺杂浓度和输入信号功率条件下,两段级联EDTFA可以有效的抑制光纤中反向传输放大自发辐射(ASE)噪声,降低反转粒子数的消耗,从而提高信号增益、输出功率,并且降低了噪声系数。
短句来源
     Generally,the second harmonic waves are produced through coalescence of the forward and backward propagating Langmuir waves.
     正向Langmuir波和反向Langmuir波的相互作用被认为是产生静电的高次谐波的原因之一。
短句来源
  相似匹配句对
     The Backward Clinical Trial
     反向临床试验
短句来源
     2. Backward ideas.
     ②观念落后 ;
短句来源
     Generally,the second harmonic waves are produced through coalescence of the forward and backward propagating Langmuir waves.
     正向Langmuir波和反向Langmuir波的相互作用被认为是产生静电的高次谐波的原因之一。
短句来源
     They are caused by the reradiation of Rayleigh wave propagating along the radial surface or the longitudinal surface in the backward direction.
     它们是由沿径向和纵向反向传播的Rayleigh波的再辐射产生的。
短句来源
     Generating and Propagating of Landslide Bore
     滑坡涌浪的产生与传播波形分析
短句来源
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  backward propagating
Forward and backward propagating peristaltic waves were invoked in two other unconscious dogs, indicating that the recreation of colonic peristalsis under microprocessor control is feasible.
      
Several types of behavior can be detected in addition to the normal backward propagating waves of about 2 Hz that propel untethered worms forward.
      
A WKB solution of the problem predicts a backward propagating wave on account of the self-induced inhomogeneity.
      
Simulations performed with this model reproduce experimental phenomena observed in traffic such as free flow, synchronized flow, congested flow, lane inversion, forward and backward propagating waves.
      
The out-coupling angle a = 34 indicates that backward propagating QPM using the CC-SW grating is realized.
      
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The effect of energy dependence (ED) of the G matrix on RPA is investigated. Using the Hamada-Johnston potential, we calculate the 1p-1h TDA and RPA spectra of ~(16)O. The following four cases are considered: (1) every G matrix element is approximated by its on shell value, (2) ED of G is taken intoaccount rigorously, (3) the effect of self-screening (SC) is considered, but the G matrix elements are assumed on the energy shell, (4) both SC and ED of G are taken into account. It is found that ED of G indeed causes...

The effect of energy dependence (ED) of the G matrix on RPA is investigated. Using the Hamada-Johnston potential, we calculate the 1p-1h TDA and RPA spectra of ~(16)O. The following four cases are considered: (1) every G matrix element is approximated by its on shell value, (2) ED of G is taken intoaccount rigorously, (3) the effect of self-screening (SC) is considered, but the G matrix elements are assumed on the energy shell, (4) both SC and ED of G are taken into account. It is found that ED of G indeed causes a substantial damping effect on the backward-propagating bubbles of RPA as suggested by Wu. Further, ED of G and SC work in the same direction to diminish the difference between the energy spectra calculated by TDA and RPA.

本文考察了G矩阵的偏离能壳性对RPA的影响,在以下四种情况下计算了~(16)O的单粒子单空穴激发TDA与RPA谱:(Ⅰ) 假定每个G矩阵元都可取成在能壳上的值;(Ⅱ) 严格顾及了G矩阵的偏离能壳性;(Ⅲ) 考虑了自屏蔽效应,但G矩阵元均取在能壳上的值;(Ⅳ) G矩阵的偏离能壳性和自屏蔽效应都顾及了。发现例如T=0的第一个0~+态能谱分别是(单位:MeV) 说明G矩阵的偏离能壳性的影响是很重要的,它确实可以提供一个阻碍“声子崩溃”的重要因素,同样,自屏蔽效应也起着削弱反向项的作用。顾及了G矩阵的偏离能壳性和自屏蔽效应之后,RPA谱与TDA谱之间的差别几乎消失了。

Numerical simulation of propagation of rotor / stator interaction noise in turbofan exhaust duct which is assumed to be made up of annular ducts with axially segmented treatments is developed by the mode analysis method. By quantitatively predicting the change of the mode coefficient distribution of forward and backward propagating acoustic energy at the segment interfaces, the attenuation of interaction noise is also investigated. The results manifest that when the forward travelling sound waves pass...

Numerical simulation of propagation of rotor / stator interaction noise in turbofan exhaust duct which is assumed to be made up of annular ducts with axially segmented treatments is developed by the mode analysis method. By quantitatively predicting the change of the mode coefficient distribution of forward and backward propagating acoustic energy at the segment interfaces, the attenuation of interaction noise is also investigated. The results manifest that when the forward travelling sound waves pass through the admittance discontinuity planes, the modal reflection will increase and the forward modes of waves will decrease. So the modal reflection at the interfaces can be utilized to suppress propagation of the in-duct noise. In addition, the effects of the change of resistance and reactance of liners on the suppression are theoretically calculated. It can be concluded that in the presence of high frequency source and high Mach number flow, whether for the change of resistance or for the change of reactance, there exist local peak values and fluctuation of the in-duct suppression, and at this moment, the monotonicity of suppression with the change of resistance and of reactance will no longer come into existence. Therefore, it is necessary for the engine noise reduction to choose adequate impedance of liners.

应用模态分析方法对转/静干涉噪声在敷设声衬的风扇静子后排气管道中的声传播,声衰减进行了数值模拟。前传声波在遇到声导纳间断面时,声波反射模态增加,前传模态相应减少,因此可利用多段声衬声导纳间断面上的模态反射来抑制管内噪声的传播。计算并分析了均匀流情况下声衬声阻和声抗对管内消声量的影响。在高频声源和大Mach数气流情况下,随声阻或声抗变化,噪声衰减量都存在局部峰值和波动,此时不再呈现低频情况下的单调特征。因此,选择适当的声衬阻抗可有效地抑制发动机噪声传播。

Using a set of traveling wave rate equations,a superluminescent diode with a low facet reflectivity is studied. Analytical expressions of the distributions of carrier density,forward- and backward-propagating photon densities,and gain are obtained at different facet reflectivities.It is shown that the high nonuniform carrier distribution is evident in the case of low facet reflectivity.The results can serve as useful guides in understanding emission mechanism of superluminescent diodes.

AnalyticalmodelofasuperluminescentdiodeMADongge;SHIJiawei;GAODingsan(Dept.ofElec.Eng.,JilinUniversity,Changchun130023,CHN)Abs...

 
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