963 research outputs found
catena-Poly[[trimethyltin(IV)]-μ-phenylseleninato-κ2 O:O′]
In the title polymeric coordination compound, [Sn(CH3)3(C6H5O2Se)]n, the SnIV atom has a distorted trigonal–bipyramidal geometry, with two O atoms of two symmetry-related bridging phenylseleninate anions in axial positions and three methyl groups in equatorial positions. In the crystal, the complex exhibits a chain structure parallel to the b axis
An Approach to Discovering Product/Service Improvement Priorities : Using Dynamic Importance-Performance Analysis
This research was funded by the National Natural Science Foundation of China grant numbers 71772075, 71302153, and 71672074; the Technology R&D Foundation of Guangzhou, China grant number 201607010012; the Social Science Foundation of Guangzhou, China grant number 2018GZYB31; and the Foundation of Chinese Government Scholarship grant number 201806785010. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the above funding agencies.Peer reviewedPublisher PD
catena-Poly[[triphenyltin(IV)]-μ-3-methylphenylseleninato-κ2 O:O′]
In the polymeric title coordination compound, [Sn(C6H5)3(C7H7O2Se)]n, the SnIV atom has a distorted trigonal–bipyramidal geometry, with two O atoms from two symmetry-related bridging seleninate ligands in axial positions and three phenyl groups in the equatorial plane. In the crystal, the complex exhibits a zigzag chain structure running parallel to the c axis. An intrachain C—H⋯O hydrogen bond is observed
The linear and nonlinear Jaynes-Cummings model for the multiphoton transition
With the Jaynes-Cummings model, we have studied the atom and light field
quantum entanglement of multiphoton transition, and researched the effect of
initial state superposition coefficient , the transition photon number
, the quantum discord and the nonlinear coefficient on the
quantum entanglement degrees. We have given the quantum entanglement degrees
curves with time evolution, and obtained some results, which should have been
used in quantum computing and quantum information.Comment: arXiv admin note: text overlap with arXiv:1404.0821, arXiv:1205.0979
by other author
Improving Music Genre Classification from multi-modal properties of music and genre correlations Perspective
Music genre classification has been widely studied in past few years for its
various applications in music information retrieval. Previous works tend to
perform unsatisfactorily, since those methods only use audio content or jointly
use audio content and lyrics content inefficiently. In addition, as genres
normally co-occur in a music track, it is desirable to capture and model the
genre correlations to improve the performance of multi-label music genre
classification. To solve these issues, we present a novel multi-modal method
leveraging audio-lyrics contrastive loss and two symmetric cross-modal
attention, to align and fuse features from audio and lyrics. Furthermore, based
on the nature of the multi-label classification, a genre correlations
extraction module is presented to capture and model potential genre
correlations. Extensive experiments demonstrate that our proposed method
significantly surpasses other multi-label music genre classification methods
and achieves state-of-the-art result on Music4All dataset.Comment: Accepted by ICASSP 202
Non-Hermitian guided modes and exceptional points using loss-free negative-index materials
We analyze the guided modes in coupled waveguides made of negative-index
materials without gain or loss. We show that it supports non-Hermitian
phenomenon on the existence of guided mode versus geometric parameters of the
structure. The non-Hermitian effect is different from parity-time (PT)
symmetry, and can be explained by a simple coupled-mode theory with an anti-PT
symmetry. The existence of exceptional points and slow-light effect are
discussed. This work highlights the potential of loss-free negative-index
materials in the study of non-Hermitian optics
Higher-order exceptional points in loss-free waveguide arrays with negative-index materials
Negative-index materials (NIMs) are shown to support optical anti-parity-time
(anti-PT) symmetry even when they are lossless. Here we prove the feasibility
in achieving higher-order exceptional points (EPs) in loss-free waveguide
arrays by utilizing the anti- symmetry induced by NIM. Numerical
simulation about a third-order EP fits well with the coupled-mode theory. A
scheme of achieving fourth-order EPs is also discussed. This work highlights
the potential of loss-free NIMs in the study of non-Hermitian optics
Quantum network teleportation for quantum information distribution and concentration
We investigate the schemes of quantum network teleportation for quantum
information distribution and concentration which are essential in quantum cloud
computation and quantum internet. In those schemes, the cloud can send
simultaneously identical unknown quantum states to clients located in different
places by a network like teleportation with a prior shared multipartite
entangled state resource. The cloud first perform the quantum operation, each
client can recover their quantum state locally by using the classical
information announced by the cloud about the measurement result. The number of
clients can be beyond the number of identical quantum states intentionally
being sent, this quantum network teleportation can make sure that the retrieved
quantum state is optimal. Furthermore, we present a scheme to realize its
reverse process, which concentrates the states from the clients to reconstruct
the original state of the cloud. These schemes facilitate the quantum
information distribution and concentration in quantum networks in the framework
of quantum cloud computation. Potential applications in time synchronization
are discussed.Comment: 7 pages, 1 figur
- …