搜索结果: 1-15 共查到“知识库 微波物理学”相关记录29条 . 查询时间(2 秒)
VALIDATION OF THE DAILY PASSIVE MICROWAVE SNOW DEPTH PRODUCTS OVER NORTHERN CHINA
Snow Depth Products Snow Cover Passive Microwave Validation Northern China
2018/5/15
Passive microwave sensors have the capability to provide information on snow depth (SD), which is critically important for hydrological modeling and water resource management. However, the different a...
A MODIFIED TWO-SCALE MICROWAVE SCATTERING MODEL FOR A GAUSSIAN-DISTRIBUTED CONDUCTING ROUGH SURFACE
Two-scale Model Rough Surface Backscattering Model Wavelet Packet Transform AIEM
2018/5/16
A modified two-scale microwave scattering model (MTSM) was presented to describe the scattering coefficient of natural rough surface in this paper. In the model, the surface roughness was assumed to b...
为了进一步提高大气对微波传播衰减影响的描述精度，为微波链路遥感反演大气新应用提供理论基础，该文系统性研究了大气主要吸收气体和各种大气粒子对微波传播的衰减情况。利用ITU-R模型计算大气主要气体成分对微波的吸收衰减，然后在降水粒子、云雾粒子和沙尘粒子的介电模型、形状、相态和谱分布的基础上，计算得到群粒子对微波的衰减特性，系统讨论降水强度、相态、含水量、谱分布、气压和温度等因素对微波传播衰减的影响。数...
由于经典的Black-Scholes期权定价模型的假设忽略了突发事件对资产价格的影响和"波动率微笑"对期权价值的影响而与实际情形往往存在偏差,因此学者们对Black-Scholes模型的改进则主要分别集中在带跳扩散过程的期权定价模型与具随机波动率的期权定价模型等两个方面,然而却少见将这两种模型结合起来的研究。本文首先在带跳扩散过程的期权定价模型与具随机波动率的期权定价模型的研究工作的基础上,建立了...
运动平台上时差变化率的相差检测
时差变化率 相差定位 多普勒频移 单站无源定位 短基线 Time Difference Rate Phase Difference Location Doppler Shift Single Observer Passive Localization Short Baseline
2014/7/4
提出了一种利用机载短基线阵列，以及通过多通道相移测量获得时差变化率的新方法。由相差与时差定位方程即可解出基于相差检测的时差表示式，通过微分，并利用相移与频移间的函数关系即可得到仅基于相差检测的时差变化率。另一方面，如对测向公式进行微分运算，则又可得到仅基于频差检测的时差变化率。模拟计算验证了所导出的时差变化率测算公式都是正确性的。初步的误差分析说明，由于分母上具有量级很大的光速，故基于相差或频差的...
虚拟基线的相位跳变及校正
虚拟基线 相位跳变 相位干涉仪 相位模糊 Virtual Baseline Phase Jump Phase Interferometer Phase Ambiguity
2014/7/4
分析发现，在对相邻两基线采用异侧比值相减方式构造虚拟短基线时，在部分的到达角方向上，波长整周数的差值将不为零，而是存有跳变。并且，在利用虚拟短基线的无模糊测向结果求解长基线的相位模糊值的过程中同样存有相位跳变问题。本文的分析表明，通过对到达角的正弦值进行判别即可实现校正，且修正因子即为两基线差值的比例因子。最后通过应用精确测向公式从理论上说明，若不考虑相差测量误差，则通过校正之后，采用一维双基线阵...
针对传统的使用小波分解系数作为特征对走路、上楼、下楼进行分类时不能对具有相同强度加速度信号的步态样本进行分类的问题，提出了一种基于样本熵和小波能量相结合作为特征的分类算法。方法 利用三轴加速度传感器采集走路、上楼、下楼三种步态下的上臂加速度信号，将信号进行小波分解，提取能量特征和样本熵特征，构建决策树分类器和贝叶斯分类器。结果 决策树分类器和贝叶斯分类器的总体分类精度分别为75%和78.75%，使...
Two-Stage Dilute Acid Hydrolysis of Dairy Manure for Nutrient Release, Solids Reduction and Reducing Sugar Production
Microwave Advanced Oxidation Solids Destruction Reducing Sugar Generation Nutrient Solubilization
2013/3/8
The microwave enhanced advanced oxidation process (MW/H2O2-AOP) aided with dilute sulfuric acid was applied in a two-stage treatment of dairy manure for nutrient release, solids reduction, and reducin...
H∞次优滤波在速度姿态匹配传递对准中的应用
传递对准 速度＋姿态匹配 H∞ 滤波 卡尔曼滤波器
2014/4/24
针对速度＋姿态匹配传递对准中量测中的不确定性干扰，采用H∞滤波方法进行速度＋姿态匹配传递对准。并与卡尔曼滤波进行了比较，仿真结果表明，当系统噪声和量测噪声为白噪声时，卡尔曼滤波器和H∞滤波器均有效，而且卡尔曼滤波器优于H∞滤波器。但是，当系统噪声与量测噪声为有色噪声并且存在建模误差时，卡尔曼滤波收敛速度明显低于H∞滤波的收敛速度。H∞滤波更符合工程应用的实际情况，因而H∞滤波是一种非常有效的估计方...
Microwave Photon Counter Based on Josephson Junctions
University of Wisconsin, Madison University of Waterloo
2010/11/24
The strong interaction of superconducting in-tegrated circuits with microwave photons forms
the basis of circuit quantum electrodynamics (cQED), an attractive paradigm for scalable
quantum computing...
Nonlinear growth with the microwave intensity in radiation-induced magnetoresistance oscillations
Nonlinear growth with the microwave radiation-induced magnetoresistance oscillations
2010/11/24
We report the observation of inverse-magnetic-field-periodic, radiation-induced magnetoresistance oscillations in GaAs/AlGaAs heterostructures prepared in W. Wegscheider’s group, compare their charact...
Traversable wormhole in the deformed Hořava-Lifshitz gravity
HL gravity traversable wormholes
2010/12/20
Asymptotically flat wormhole solutions are found in the deformed Hoˇrava-Lifshitz gravity. It
turns out that higher curvature terms can not play the role of exotic matters which are crucial to form a...
We have measured the frequency-dependent, complex impedance of thin metal strips in a broad
range of microwave frequencies (45 MHz to 20 GHz). The spectra are in good agreement with
theoretical pred...
Anomalous galvanomagnetism, cyclotron resonance and microwave spectroscopy of topological insulators
cyclotron resonance microwave spectroscopy topological insulators
2010/11/22
The surface quantum Hall state, magneto-electric phenomena and their connection to axion electrodynamics have been studied intensively for topological insulators. One of the obstacles for observing su...
Dynamics of Diffeomorphism Degrees of Freedom at a Horizon
Dynamics of Diffeomorphism Degrees Freedom Horizon
2010/12/20
We define a set of boundary conditions that ensure the presence of a null hypersurface with the
essential characteristics of a horizon, using the formalism of weakly isolated horizons as a guide.We t...