搜索结果: 91-105 共查到“知识库 电动力学”相关记录145条 . 查询时间(5.27 秒)
High order coherent control sequences of fat pulses
High order coherent control sequences fat pulses
2010/10/19
We analyze the performance of sequences of fat pulses of various lengths and shapes for dynamic
decoupling and we compare it with that of sequences of ideal, instantaneous pulses. The use of second o...
Dephasing effects on stimulated Raman adiabatic passage in tripod configurations
Dephasing effects stimulated Raman adiabatic passage configurations
2010/10/19
We present an analytic description of the effects of dephasing processes on stimulated Raman
adiabatic passage in a tripod quantum system. To this end, we develop an effective two-level model.Our ana...
Three qubits in a symmetric environment: dissipatively generated asymptotic entanglement
Three qubits symmetric environment asymptotic entanglement
2010/10/18
We study the asymptotic entanglement of three identical qubits under the action of a Markovian open system dynamics that does not distinguish them.We show that by adding a completely depolarized qubit...
QED with a spherical mirror
QED spherical mirror
2010/10/19
We investigate the Quantum-Electro-Dynamic properties of an atomic electron close to the focus
of a spherical mirror. We rst show that the spontaneous emission and excited state level shift of the a...
Two-Photon Transport in a Waveguide Coupled to a Cavity with a Two-level System
Two-Photon Transport in a Waveguide Coupled Two-level System
2010/10/20
We consider a system where a waveguide is coupled to a cavity embedded with a two-level system
(TLS), and study the effects when a two-photon quantum state is injected into the waveguide. The wave fu...
Position dependent energy level shifts of an accelerated atom in the presence of a boundary
Position dependent energy level shifts accelerated atom boundary
2010/10/19
We consider a uniformly accelerated atom interacting with a vacuum electromagnetic field in
the presence of an infinite conducting plane boundary and calculate separately the contributions of vacuum ...
We show that treating the blackbody radiation field as a heat bath enables one to utilize powerful techniques from the realm of stochastic physics (such as the fluctuation-dissipation theorem and the ...
A D-dimensional Markovian open quantum system will undergo quantum jumps between pure
states, if we can monitor the bath to which it is coupled with sufficient precision. In general these jumps, plus...
因为《论动体的电动力学》依据的两条原理是力学相对性原理和光速不变原理，人们就把它叫做“相对论”；爱因斯坦非常“不快”，却也无可奈何，“客观”就这样“强加于他了”。就因为这“相对”二字，导致了学者们长期以来一直把那个“垂直观测”不为0的物理量，放到相对性原理的框架中去诠释，犯下一个跨世纪的错误。 笔者在用物理方程证明传统的诠释错了之后，又从“能量”有物体自身的和物体放出的之分的角度，阐明了机械能跟振...
直接空冷电站空冷凝汽器用轴流风机为数十台集群运行, 与单台风机运行相比具有不同的空气动力学特性. 考察轴流风机阵列运行的空气动力学特性, 有利于空冷风机群的设计优化和运行调整. 以典型2×600 MW 直接空冷电站为例, 通过CFD 模拟, 获得了无风和不同环境风速、风向条件下, 每台风机流量的分布特性以及风机群的总流量变化规律, 计算了每台风机的集群因子和空冷风机阵列的平均集群因子并进行了分析....
从多方气体Naiver-Stokes (N-S)方程出发，通过行波解存在的条件，推导Euler坐标系下激波的Rankine-Hugoniot (R-H)条件及熵条件，并证明这与Lagrange坐标系下的条件一致.
Open Quantum System Dynamics from a Measurement Perspective: Applications to Coherent Particle Transport and to Quantum~Brownian Motion
Open Quantum System Dynamics a Measurement Perspective Applications Coherent Particle Transport Quantum~Brownian Motion
2010/10/20
We employ the theoretical framework of positive operator valued measures, to study Markovian open quantum systems. In particular, we discuss how a quantum system in uences its environment, or parts th...
合成了苦味酸铋配合物(Bi/PA)，对其结构进行了表征，并用TG/DTG及DSC技术研究了化合物的热行为和分解反应动力学。结果表明，在TG曲线上出现一个最大的失重阶段，对应于DSC曲线上的最大放热峰。放热分解反应过程可以认为是化学反应，其机理方程的微分式为f(α)＝3(1-α)［-ln(1-α)］2/3，动力学方程为dα/dt=10 13.51(1-α)［-ln(1-α)］2/3 e-1.96×1...
航空发动机整机耦合动力学模型及振动分析
航空发动机 整机振动 耦合动力学 碰摩
2014/3/7
面向航空发动机整机振动, 建立了航空发动机转子-滚动轴承-机匣耦合动力学模型. 该 模型具有如下特点: (1)考虑转子、滚动轴承及机匣之间的耦合作用; (2)考虑了实际航空发 动机的弹性支承及挤压油膜阻尼效应; (3)将转子考虑为等截面自由欧拉梁模型, 运用模态截 断法进行分析; (4)考虑了滚动轴承间隙、非线性赫兹接触力以及变柔性VC(Varying compliance)振动; (5)考虑了转...
脉冲爆轰发动机的系统性能分析
脉冲爆轰发动机 热循环效率分析 多级重起爆脉冲爆轰发动机
2014/3/7
采用简化的脉冲爆轰推进装置模型，利用热循环效率分析方法，推导了包含进气道总压恢复 系数的热循环效率公式. 并在特定来流条件下，考察了一个爆轰循环中进气道总压恢复系数 和燃烧室初始温度对热循环效率和比冲的影响. 研究发现，降低来流总压损失有助于提高热 循环效率，而提高燃烧室初始温度能更有效地提高热循环效率. 据此，提出了多级重起 爆脉冲爆轰发动机概念，利用在突扩截面上解耦的爆轰波的前导激波去再次压缩...