68,399 research outputs found
Laser-catalyzed spin-exchange process in a Bose-Einstein condensate
We show theoretically that it is possible to optically control collective
spin-exchange processes in spinor Bose condensates through virtual
photoassociation. The interplay between optically induced spin exchange and
spin-dependent collisions provides a flexible tool for the control of atomic
spin dynamics, including enhanced or inhibited quantum spin oscillations, the
optically-induced ferromagnetic-to-antiferromagnetic transition, and coherent
matter-wave spin conversion.Comment: 4 pages, 4 figure
Diving Deep into Sentiment: Understanding Fine-tuned CNNs for Visual Sentiment Prediction
Visual media are powerful means of expressing emotions and sentiments. The
constant generation of new content in social networks highlights the need of
automated visual sentiment analysis tools. While Convolutional Neural Networks
(CNNs) have established a new state-of-the-art in several vision problems,
their application to the task of sentiment analysis is mostly unexplored and
there are few studies regarding how to design CNNs for this purpose. In this
work, we study the suitability of fine-tuning a CNN for visual sentiment
prediction as well as explore performance boosting techniques within this deep
learning setting. Finally, we provide a deep-dive analysis into a benchmark,
state-of-the-art network architecture to gain insight about how to design
patterns for CNNs on the task of visual sentiment prediction.Comment: Preprint of the paper accepted at the 1st Workshop on Affect and
Sentiment in Multimedia (ASM), in ACM MultiMedia 2015. Brisbane, Australi
Recommended from our members
Two novel nonlinear companding schemes with iterative receiver to reduce PAPR in multi-carrier modulation systems
Companding transform is an efficient and simple method to reduce the Peak-to-Average Power Ratio (PAPR) for Multi-Carrier Modulation (MCM) systems. But if the MCM signal is only simply operated by inverse companding transform at the receiver, the resultant spectrum may exhibit severe in-band and out-of-band radiation of the distortion components, and considerable peak regrowth by excessive channel noises etc. In order to prevent these problems from occurring, in this paper, two novel nonlinear companding schemes with a iterative receiver are proposed to reduce the PAPR. By transforming the amplitude or power of the original MCM signals into uniform distributed signals, the novel schemes can effectively reduce PAPR for different modulation formats and sub-carrier sizes. Despite moderate complexity increasing at the receiver, but it is especially suitable to be combined with iterative channel estimation. Computer simulation results show that the proposed schemes can offer good system performances without any bandwidth expansion
Single chargino production via gluon-gluon fusion in a supersymmetric theory with an explicit R-parity violation
We studied the production of single chargino
accompanied by lepton via gluon-gluon fusion at the LHC. The
numerical analysis of their production rates is carried out in the mSUGRA
scenario with some typical parameter sets. The results show that the cross
sections of the productions via gluon-gluon
collision are in the order of femto barn quantitatively at the
CERN LHC, and can be competitive with production mechanism via quark-antiquark
annihilation process.Comment: LaTex file, 18 pages, 4 EPS file
Polarization Induced Switching Effect in Graphene Nanoribbon Edge-Defect Junction
With nonequilibrium Green's function approach combined with density
functional theory, we perform an ab initio calculation to investigate transport
properties of graphene nanoribbon junctions self-consistently. Tight-binding
approximation is applied to model the zigzag graphene nanoribbon (ZGNR)
electrodes, and its validity is confirmed by comparison with GAUSSIAN03 PBC
calculation of the same system. The origin of abnormal jump points usually
appearing in the transmission spectrum is explained with the detailed
tight-binding ZGNR band structure. Transport property of an edge defect ZGNR
junction is investigated, and the tunable tunneling current can be sensitively
controlled by transverse electric fields.Comment: 18 pages, 8 figure
Spatio-Temporal Sentiment Hotspot Detection Using Geotagged Photos
We perform spatio-temporal analysis of public sentiment using geotagged photo
collections. We develop a deep learning-based classifier that predicts the
emotion conveyed by an image. This allows us to associate sentiment with place.
We perform spatial hotspot detection and show that different emotions have
distinct spatial distributions that match expectations. We also perform
temporal analysis using the capture time of the photos. Our spatio-temporal
hotspot detection correctly identifies emerging concentrations of specific
emotions and year-by-year analyses of select locations show there are strong
temporal correlations between the predicted emotions and known events.Comment: To appear in ACM SIGSPATIAL 201
The Nature of Quantum Hall States near the Charge Neutral Dirac Point in Graphene
We investigate the quantum Hall (QH) states near the charge neutral Dirac
point of a high mobility graphene sample in high magnetic fields. We find that
the QH states at filling factors depend only on the perpendicular
component of the field with respect to the graphene plane, indicating them to
be not spin-related. A non-linear magnetic field dependence of the activation
energy gap at filling factor suggests a many-body origin. We therefore
propose that the and states arise from the lifting of the spin
and sub-lattice degeneracy of the LL, respectively.Comment: 4 pages, 4 figures, to appear in Phys. Rev. Let
ECHOES OF DECLASSIFIED INTELLIGENCE SATELLITE PHOTOGRAPHS: THEIR ROLE AND APPLICATION IN THE RESEARCH AND PRESERVATION OF CHINA’S BUILT VERNACULAR HERITAGE
Vernacular architecture is constructed spontaneously and used by ordinary people, and they have been subject to constant modifications by changes in ownership, functions, and constructions according to people’s living demands. In the last two decades, many cases which were constructed in the traditional way and survived China’s overwhelming urbanization process have been listed in the preservation list with the increasing interest in cultural heritage. Regarding this type of heritage that is a result of multiple modifications, many restorations aim to recover the changed architecture to traditional formal integrity. Due to the rarity of detailed written or image references, some restorations become a kind of “creation” and fall into the cliché of stylistic restoration, which is posing an artificial risk to their historical values. Facing this difficulty, the authors turn to an important historical record - the DISP (declassified intelligence satellite photographs): since 1995, the US has declassified three batches of satellite photographs that were taken from the 1960s to the 1980s, before China’s great change in Reform and Opening Up, almost covering all of China. These photographs are an important historical photographic record of the territory as well as the vernacular architecture scattered on it. This paper uses two cases to illustrate the important role of these photographs in China’s built vernacular heritage: both as a reference to restoration and as a valuable source for historical research. The authors also discuss the prospect and limitations of this source
Who Builds Cities in China? How Urban Investment and Development Companies Have Transformed Shanghai
While there is general acceptance that urban governance in China is entrepreneurial in nature, little has been written about the precise ways in which Chinese cities implement entrepreneurial policies. In this article we argue that the primary agents of urban entrepreneurialism in China are urban investment and development companies (UIDCs), known in Chinese as chengtou for short. We start by defining UIDCs as a category of state‐owned enterprise, but one that is wholly owned by local (often city) governments. We note that in the literature UIDCs are generally recognized for their involvement in raising funds for projects and piling up hidden debts, but their multiple roles in urban development tend to be neglected. We introduce here four UIDCs that have been largely responsible for the transformation of Shanghai into a modern city spearheading Chinese state entrepreneurialism, and in doing so we delineate the full range of the activities of these urban business empires. We argue in particular that they represent a corporate involvement by the state in urban development—the state presenting itself in the guise of a market player, a corporate entity able to raise funds and act as if it were a private company. UIDCs are the driving force behind China's urban entrepreneurialism and are without a clear parallel elsewhere
- …