搜索结果: 121-135 共查到“知识库 无线电物理”相关记录221条 . 查询时间(2.474 秒)
Quantum singular operator limits of thin Dirichlet tubes via $\Gamma$-convergence
Quantum singular operator limits thin Dirichlet tubes $\Gamma$-convergence
2010/11/11
The $\Gamma$-convergence of lower bounded quadratic forms is used to study the singular operator limit of thin tubes (i.e., the vanishing of the cross section diameter) of the Laplace operator with Di...
Does Adiabatic Quantum Optimization Truly Fail for NP-complete problems?
Adiabatic Quantum Optimization Truly Fail NP-complete problems
2010/10/29
It has been recently argued that adiabatic quantum optimization would fail in solving NP-complete problems because of the occurrence of exponentially small gaps due to crossing of local minima of the ...
Nonlinear Landau-Zener tunneling in quantum phase space
Nonlinear tunneling quantum phase space
2010/10/29
We present a detailed analysis of the Landau-Zener problem for an interacting Bose-Einstein condensate in a time-varying double-well trap, especially focussing on the relation between the full many-p...
Landauer Transport Model for Hawking Radiation from a Black Hole
Landauer Transport Model Hawking Radiation Black Hole
2010/10/27
We investigate the Hawking radiation energy and entropy flow rates from a black hole viewed as
a one-dimensional (1D) Landauer transport process. The conformal symmetry in the near-horizon
region le...
Entanglement can increase asymptotic rates of zero-error classical communication over classical channels
Entanglement asymptotic rates zero-error classical communication classical channels
2010/10/18
It is known that the number of di erent classical messages which can be communicated
with a single use of a classical channel with zero probability of decoding error can sometimes
be increased by us...
Dynamical decoupling for a qubit in telegraph-like noises
Dynamical decoupling qubit telegraph-like noises
2010/10/18
Based on the stochastic theory developed by Kubo and Anderson, we present an exact result of the decoherence function of a qubit in telegraph-like noises under dynamical decoupling control. We prove t...
Passive sources for the Bennett-Brassard 1984 quantum key distribution protocol with practical signals
Passive sources Bennett-Brassard 1984 quantum key distribution protocol practical signals
2010/10/20
Most experimental realizations of quantum key distribution are based on the Bennett-Brassard
1984 (so-called BB84) protocol. In a typical optical implementation of this scheme, the sender
uses an ac...
Independent Attacks in Imperfect Settings; A Case for A Two Way Quantum Key Distribution Scheme
Independent Attacks Imperfect Settings A Case Quantum Key Distribution Scheme
2010/10/20
We review the study on a two way quantum key distribution protocol given imperfect settings
through a simple analysis of a toy model and show that it can outperform a BB84 setup. We provide the suffi...
Temporal Leggett-Garg-Bell inequalities for sequential multi-time actions in quantum information processing, and a re-definition of Macroscopic Realism
Temporal Leggett-Garg-Bell inequalities sequential multi-time actions quantum information processing a re-definition Macroscopic Realism
2010/10/19
The usual formulation of Macrorealism is recast to make this notion fully concurrent with the basic ideas behind classical physics. The assumption of non-invasiveness of measurements is dropped. Inste...
Reflection of a Particle from a Quantum Measurement
Reflection Particle Quantum Measurement
2010/10/21
We present a generalization of continuous position measurements that accounts for a spatially inhomogeneous measurement strength. This describes many real measurement scenarios, in which the rate at w...
硅纳米梁振动基波频率的半连续体模型
NEMS 硅纳米梁 半连续体 频率
2014/5/15
基于Sun-Zhang提出的应变能量计算模型，根据动势能转换与守恒原理，本文提出了用于分析硅纳米梁基波频率的半连续体模型。与传统的连续体模型相比，该方法考虑了厚度方向进入纳米尺度所带来的物理特性的离散化现象。本文对理论推得的基频模型进行了验证，在极小尺寸时，使用分子动力学软件Material Studio TM验证，在较大尺寸时，用连续介质模型验证，从验证结果可以看出，在这两种尺寸下，各自都很吻合...
提出了一种椭圆低通可调滤波器的调谐方法，即通过调节第一传输零点（FTZ）来改变3dB截止频率Tc。解析计算表明，小范围内改变FTZ既可调节Tc和滚降速率，又能保证通带和阻带的特性基本不变。作者提出FTZ的移动可由串联谐振支路处容性MEMS开关的分布加载来实现，并基于微扰法求出器件中心谐振频率及特性的变化规律。本文相应设计了Tc为16GHz的7阶步进式滤波器。高频有限元全波仿真表明，...
本文在波数域波场分解方法的基础上，研究了ＶＴＩ介质中弹性波波场准纵波、准横波分解的空间域算法。通过求解克里斯托弗尔方程，得到准纵波与准横波的偏振方向及波数域波场分解算子，对其进行反傅里叶变换得到空间域波场分解算子；由空间域波场分解算子与原始波场的褶积即可得到对应不同波型的具有多分量特征的波场分解结果。由于在不同空间位置处采用不同的分解算子，故本文算法能适应各向异性参数随空间位置变化的情况。分别采用...
介观压阻效应电磁驱动微机械陀螺仪的设计与测试
介观压阻效应 微机械陀螺 驱动测试 检测测试
2014/4/30
本文将共振隧穿二极管具有的介观压阻效应与哥氏效应结合应用于陀螺的设计中，提出了一种新型的采用回折型正交梁的陀螺结构。结合现在的工艺水平，设计了合理的加工工艺方案，并进行了加工与封装。通过对封装后的陀螺进行驱动方向测试，得到了固有频率的范围；检测方向上利用振动台对陀螺灵敏度进行了测试，得到在1KHz和4KHz时的测试灵敏度分别为7.51mV/g、100.74mV/g。