1,137 research outputs found
Quantum entanglement in plasmonic waveguides with near-zero mode indices
We investigate the quantum entanglement between two quantum dots in a
plasmonic waveguide with near-zero mode index, considering the dependence of
concurrence on interdot distance, quantum dot-waveguide frequency detuning and
coupling strength ratio. High concurrence is achieved for a wide range of
interdot distance due to the near-zero mode index, which largely relaxes the
strict requirement of interdot distance in conventional dielectric waveguides
or metal nanowires. The proposed quantum dot-waveguide system with near-zero
phase variation along the waveguide near the mode cutoff frequency shows very
promising potential in quantum optics and quantum information processing
Individual Use of Mobile Apps for Social Networking
Organizations are increasingly exploring the business opportunities brought about by social media applications. The ubiquitous access to these applications or their mobile versions (i.e., mobile apps) through smart phones makes them powerful. Understanding how individuals use social media applications to interact and to share information for decision making will help organizations better leverage the power of social media technology for their businesses. A research model is proposed by integrating the end-user computing theory and the psychological empowerment theory to explore the impact of effective use of mobile apps and the psychological empowerment on task innovation and continued use of mobile apps. The model was empirically tested with 390 responses using mobile apps for social networking or communication. Preliminary results suggest that the use of mobile apps and users’ psychological empowerment derived from using mobile apps lead to users’ task innovation and sustained efforts of using mobile apps
A Deep Embedding Model for Co-occurrence Learning
Co-occurrence Data is a common and important information source in many
areas, such as the word co-occurrence in the sentences, friends co-occurrence
in social networks and products co-occurrence in commercial transaction data,
etc, which contains rich correlation and clustering information about the
items. In this paper, we study co-occurrence data using a general energy-based
probabilistic model, and we analyze three different categories of energy-based
model, namely, the , and models, which are able to capture
different levels of dependency in the co-occurrence data. We also discuss how
several typical existing models are related to these three types of energy
models, including the Fully Visible Boltzmann Machine (FVBM) (), Matrix
Factorization (), Log-BiLinear (LBL) models (), and the Restricted
Boltzmann Machine (RBM) model (). Then, we propose a Deep Embedding Model
(DEM) (an model) from the energy model in a \emph{principled} manner.
Furthermore, motivated by the observation that the partition function in the
energy model is intractable and the fact that the major objective of modeling
the co-occurrence data is to predict using the conditional probability, we
apply the \emph{maximum pseudo-likelihood} method to learn DEM. In consequence,
the developed model and its learning method naturally avoid the above
difficulties and can be easily used to compute the conditional probability in
prediction. Interestingly, our method is equivalent to learning a special
structured deep neural network using back-propagation and a special sampling
strategy, which makes it scalable on large-scale datasets. Finally, in the
experiments, we show that the DEM can achieve comparable or better results than
state-of-the-art methods on datasets across several application domains
The first-order effect of Holocene Northern Peatlands on global carbon cycle dynamics
Given the fact that the estimated present-day carbon storage of Northern Peatlands (NP) is about 300–500 petagram (PgC, 1 petagram = 1015 gram), and the NP has been subject to a slow but persistent growth over the Holocene epoch, it is desirable to include the NP in studies of Holocene carbon cycle dynamics. Here we use an Earth system Model of Intermediate Complexity to study the first-order effect of NP on global carbon cycle dynamics in the Holocene. We prescribe the reconstructed NP growth based on data obtained from numerous sites (located in Western Siberia, North America, and Finland) where peat accumulation records have been developed. Using an inverse method, we demonstrate that the long-term debates over potential source and/or sink of terrestrial ecosystem in the Holocene are clarified by using an inverse method, and our results suggest that the primary carbon source for the changes (sinks) of atmospheric and terrestrial carbon is the ocean, presumably, due to the deep ocean sedimentation pump (the so-called alkalinity pump). Our paper here complements ref. 1 by sensitivity tests using modified boundary conditions
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