280 research outputs found
Negative exponential behavior of image mutual information for pseudo-thermal light ghost imaging: Observation, modeling, and verification
When use the image mutual information to assess the quality of reconstructed
image in pseudo-thermal light ghost imaging, a negative exponential behavior
with respect to the measurement number is observed. Based on information theory
and a few simple and verifiable assumptions, semi-quantitative model of image
mutual information under varying measurement numbers is established. It is the
Gaussian characteristics of the bucket detector output probability distribution
that leads to this negative exponential behavior. Designed experiments verify
the model.Comment: 13 pages, 6 figure
Binary sampling ghost imaging: add random noise to fight quantization caused image quality decline
When the sampling data of ghost imaging is recorded with less bits, i.e.,
experiencing quantization, decline of image quality is observed. The less bits
used, the worse image one gets. Dithering, which adds suitable random noise to
the raw data before quantization, is proved to be capable of compensating image
quality decline effectively, even for the extreme binary sampling case. A brief
explanation and parameter optimization of dithering are given.Comment: 8 pages, 7 figure
A differential game model research on dynamic pricing and coordination of fresh agricultural products supply chain based on freshness
For the problem of optimal dynamic pricing and coordination of
fresh agricultural products supply chain, the differential equations
related to freshness and market needs are constructed, and the
optimal control theory is used to solve the optimal strategy under
centralized and decentralized decision-making, i.e., optimal selling
price and optimal preservation input. The equilibrium results
under the two scenarios are also compared. The comparison finds
that the decentralized scenario leads to low overall supply chain
profits, based on which a two-part pricing contract is proposed to
coordinate the supply chain operating companies. The results
show that freshness effectiveness directly impacts pricing, and the
centralized scenario does not necessarily lead to high prices for
fresh produce due to the ‘double marginal effect’. the two pricing
contracts can successfully coordinate the supply chain. The freshness
effectiveness increases the supply chain coordination ability
of fresh produce suppliers, while operational inefficiencies, on the
contrary, decrease the coordination abilit
Putting Structure into Fluidized Bed – From Concept to Industrial Applications
Structures of particles, particle agglomerates, distributors, and internals have significantly influence on hydrodynamics and transfer behaviors of the dense gas-solid fluidized bed. For nanomaterial production, the particle surface and their agglomerated structures directly influence the fluidization behaviors; while for coal to chemical process, the distributors, internals play an important role in regime transient, and hydrodynamics. Carbon nanotubes mass production, coal to chemicals process. and fuel production were employed as examples to describe the concept of putting structures into fluidized bed, and then to put these structures into industrial applications
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