搜索结果: 1-15 共查到“工学 Excitation”相关记录28条 . 查询时间(0.287 秒)
THE EFFECTIVE OF DIFFERENT EXCITATION WAVELENGTHS ON THE IDENTIFICATION OF PLANT SPECIES BASED ON FLUORESCENCE LIDAR
Laser-induced fluorescence Excitation wavelength Multivariate analysis Remote sensing classification
2016/7/4
Laser-induced fluorescence (LIF) served as an active technology has been widely used in many field, and it is closely related to excitation wavelength (EW). The objective of this investigation is to d...
The dynamics of an autonomous conservative three degree of freedom system which exhibits autoparametric quasiperiodic excitation is investigated. The system is a generalization of a classical system k...
Parametric Excitation and Evolutionary Dynamics
Parametric Excitation Evolutionary Dynamics
2015/8/27
Parametric excitation refers to dynamics problems in which the forcing function enters into the governing differential equation as a variable coefficient. Evolutionary dynamics refers to a mathematica...
Optimizing Output Power of a Variable Speed Synchronous Generator by Controlling Excitation and Load Restistance
Output Power Variable Speed Synchronous Generator Controlling Excitation Load Resistance
2014/11/4
Since 1973 the University of Massachusetts Energy Alternatives Program has been involved in a project, the UMASS Wind Furnace (WF-1) which is directed at supplying the heating needs of households in n...
Spatial control of surface plasmon polariton excitation at planar metal surface
Surface plasmons Thin films Phase modulation Spatial light modulators
2015/8/6
We illustrate that the surface plasmon polariton (SPP) excitation through the prism coupling method is fundamentally limited by destructive interference of spatial light components. We propose that th...
Electron-Irradiation and Photo-Excitation Darkening and Bleaching of Yb Doped Silica Fibers: Comparison
Ytterbium Doped Silica Fibers Photodarkening Electron Irradiation
2013/1/30
We report a comparative experimental study of the attenuation spectra transformations for a series of Yb doped alumino-germano silicate fibers with different contents of Yb3+ dopants, which arise as t...
Energy spectra of gravity and capillary waves with narrow initial excitation
Energy spectra gravity capillary waves narrow initial excitation
2011/8/4
Abstract: In this Letter we present a general method for describing discrete modes' generation in a turbulent wave system with narrow initial excitation. The method is based on the mechanism of modula...
Parametric studies of the performance of particle dampers under harmonic excitation
particle damper parametric study discrete-element method impact momentum
2014/4/10
The performance of particle dampers under dynamic loads is very complicated and highly nonlinear;consequently, no guidelines currently exist for determining the optimum strategies for maximizing their...
Nonlinear study of the dynamic behavior of a string-beam coupled system under combined excitation
1:1 internal resonance String-beam Multiple scales Chaotic response Stability
2012/2/28
In this paper, the nonlinear dynamic behavior of a string-beam coupled system subjected to external, parametric and tuned excitations is presented. The governing equations of motion are obtained for t...
Shaking table test of the effects of multi-unit particle dampers attached to an MDOF system under earthquake excitation
analytical modeldiscrete element methodimpactparticle damperpassive vibration controlshaking table test
2014/4/10
This paper presents the results of an experimental and analytical/computational study of the performance of multi-unit particle dampers with an MDOF system. A series of shaking table tests of a three-...
Enhancement of optical absorption in thin-film organic solar cells through the excitation of plasmonic modes in metallic gratings
optical absorption organic solar cells plasmonic modes metallic gratings
2015/8/10
We theoretically investigate the enhancement of optical absorption in thin-film organic solar cells in which the top transparent electrode is partially substituted by a periodic metallic grating...
Active TLCGD control of plane asymmetric buildings under earthquake excitation
Asymmetric building Earthquake excitation Active control LQR algorithm
2012/2/29
The sealed, tuned liquid column gas damper (TLCGD) with gas-spring effect extends the frequency range of application and efficiently increases the modal structural damping. Active tuned liquid column ...
电激励信号频率对红点病苹果采后电学特性影响（Influence of Frequency of Electric Excitation Signal on Dielectric Property of Fuji Apples with Red-dot Disease）
苹果 红点病 电特性 激励信号
2009/11/3
研究了红点病富士苹果采后果实电特性的变化规律，为从电特性角度揭示红点病病害发病的内在机制提供理论参考。运用LCR电子测量仪测定了20℃恒温条件下贮藏70 d的红点病果实在100 Hz、1 kHz、10 kHz、100 kHz和1?MHz频率下复阻抗等电学参数。结果表明，在同一贮藏时间下，随着频率的增加，不论是病果还是正常果其果实的介电常数ε′、复阻抗Z、电抗X和电感Lp值均在减小；果实的Z、X和...
基于计算机视觉与敲击振动融合技术检测鸭蛋壳强度（Duck Egg’s Shell Intensity Model Based on Fusion of Computer Vision and Impact Excitation）
鸭蛋 蛋壳强度 多传感器融合 数据关联
2009/9/11
通过对敲击振动特征频率矩阵变异系数和测定有裂纹蛋壳强度的探索性分析，获得鸭蛋壳强度特征频率的分离阈值λ=0.02。通过传感器数据关联，确定了进入模型的特征变量。采用后向消去法进行多元线性回归建立了无裂纹鸭蛋壳强度预测模型，结合蛋壳强度分离阈值得出基于特征层多传感器融合鸭蛋壳强度的系统模型。验证性试验表明该模型有较好适应性，对于各种颜色、形态鸭蛋的蛋壳强度都有较好的预测效果，误差均值小于3.1%，误...
A New Relaying Algorithm to Detect Loss of Excitation of Synchronous Generators
Digital relaying generator protection reactive power
2009/7/28
A new digital relaying algorithm is introduced for the protection of synchronous generators against loss of excitation conditions. The new algorithm is based on measuring of the 3-phase reactive power...