497 research outputs found
Observation of Anticorrelation with Classical Light in a Linear Optical System
Two-photon anticorrelation is observed when laser and pseudothermal light
beams are incident to the two input ports of a Hong-Ou-Mandel interferometer,
respectively. The spatial second-order interference pattern of laser and
pseudothermal light beams is reported. Temporal Hong-Ou-Mandel dip is also
observed when these two detectors are at the symmetrical positions. These
results are helpful to understand the physics behind the second-order
interference of light.Comment: 5 pages, 4 figures. Comments are welcom
Religious Coping by Elderly Buddhists: A Qualitative Study of Chinese Singaporeans
Ph.DDOCTOR OF PHILOSOPH
Long Cracks Fractured Vertical Well Numerical Simulation and Application for Tight Oil Reservoir
AbstractTight oil has currently become a hot issue in worldwide non-conventional oil exploration. Based on the core displacement experiments, the existence of low velocity non-Darcy flow was proven. So the three-dimensional three-phase Long cracks fractured vertical well model was established with considering the non-Darcy flow. A new numerical simulation software for long cracks fractured vertical well was developed. Results are compared to the simulation results of Darcy flow with the commercial simulator Eclipse. Using this new software, the comprehensive comparison and analysis of the simulation results of Darcy flow and non-Darcy flow were provided including oil production rate, water cut, reservoir pressure. The numerical simulator based on low velocity non-Darcy flow can describe tight sandstone reservoir development dynamic characteristics more exactly
Twist-Dependent Anisotropic Thermal Conductivity in Homogeneous MoS Stacks
Thermal transport property of homogeneous twisted molybdenum disulfide
(MoS) is investigated using non-equilibrium molecular dynamics simulations
with the state-of-art force fields. The simulation results demonstrate that the
cross-plane thermal conductivity strongly depends on the interfacial twist
angle, while it has only a minor effect on the in-plane thermal conductivity,
exhibiting a highly anisotropic nature. A frequency-decomposed phonon analysis
showed that both the cross-plane and in-plane thermal conductivity of MoS
are dominated by the low-frequency phonons below 15 THz. As the interfacial
twist angle increases, these low-frequency phonons significantly attenuate the
phonon transport across the interface, leading to impeded cross-plane thermal
transport. However, the in-plane phonon transport is almost unaffected, which
allows for maintaining high in-plane thermal conductivity. Additionally, our
study revealed the strong size dependence for both cross-plane and in-plane
thermal conductivities due to the low-frequency phonons of MoS. The maximum
in-plane to cross-plane thermal anisotropy ratio is estimated as 400 for
twisted MoS from our simulation, which is in the same order of magnitude as
recent experimental results (~900). Our study highlights the potential of twist
engineering as a tool for tailoring the thermal transport properties of layered
materials.Comment: 25 pages, 5 figures and with S
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