2,652 research outputs found
Recurrent Fusion Network for Image Captioning
Recently, much advance has been made in image captioning, and an
encoder-decoder framework has been adopted by all the state-of-the-art models.
Under this framework, an input image is encoded by a convolutional neural
network (CNN) and then translated into natural language with a recurrent neural
network (RNN). The existing models counting on this framework merely employ one
kind of CNNs, e.g., ResNet or Inception-X, which describe image contents from
only one specific view point. Thus, the semantic meaning of an input image
cannot be comprehensively understood, which restricts the performance of
captioning. In this paper, in order to exploit the complementary information
from multiple encoders, we propose a novel Recurrent Fusion Network (RFNet) for
tackling image captioning. The fusion process in our model can exploit the
interactions among the outputs of the image encoders and then generate new
compact yet informative representations for the decoder. Experiments on the
MSCOCO dataset demonstrate the effectiveness of our proposed RFNet, which sets
a new state-of-the-art for image captioning.Comment: ECCV-1
Formation and photoelectrochemical properties of charge transfer complexes between fullerene and metallophthalocyanine
The formation of charge transfer complexes (CTC) between C-60 with metallophthalocyanine (MPc. M=Zn, Co) has been investigated in three mixed organic solvents. The MPc-C-60 CTC were characterized by using UV-Vis and fluorescence spectra. The formation equilibrium constants (K) of CTC and their stoichiometry were determined. The foundation of CTC leads to a remarkable enhancement of the photoelectrochemical property. The CTC will provide a potential opportunity to develop a new applicable photoelectric material
Bis(cinchonidinium) L-tartrate dihydrate
Bis-(3R,4S,8S,9R)-cinchonidinium (2R,3R)-tartrate dihydrate, 2C(19)H(23)N(2)O(2)(+.)C(4)H(4)O(6)(2-).2H(2)O, is a hydrated salt of cinchonidine, in which the two protonated quinuclidinic nitrogen groups interact with the ionized carboxylate group of the tartrate; the latter has twofold symmetry. The water molecule interacts with the hydroxyl group of the cation and the O atoms of the carboxylate residues to afford a three-dimensional network structure
Superconductivity induced by cobalt doping in iron-based oxyarsenides
Chemical doping has recently become a very important strategy to induce
superconductivity especially in complex compounds. Distinguished examples
include Ba-doped LaCuO (the first high temperature superconductor),
K-doped BaBiO, K-doped C and NaCoOHO. The
most recent example is F-doped LaFeAsO, which leads to a new class of high
temperature superconductors. One notes that all the above dopants are
non-magnetic, because magnetic atoms generally break superconducting Cooper
pairs. In addition, the doping site was out of the (super)conducting structural
unit (layer or framework). Here we report that superconductivity was realized
by doping magnetic element cobalt into the (super)conducting-active
FeAs layers in LaFeCoAsO. At surprisingly small Co-doping
level of =0.025, the antiferromagnetic spin-density-wave transition in the
parent compound is completely suppressed, and superconductivity with
10 K emerges. With increasing Co content, shows a maximum of 13 K at
, and then drops to below 2 K at =0.15. This result suggests
essential differences between previous cuprate superconductor and the present
iron-based arsenide one.Comment: 4 pages, 4 figure
Application of functionalized nanofluid in thermosyphon
A water-based functionalized nanofluid was made by surface functionalizing the ordinary silica nanoparticles. The functionalized nanofluid can keep long-term stability. and no sedimentation was observed. The functionalized nanofluid as the working fluid is applied in a thermosyphon to understand the effect of this special nanofluid on the thermal performance of the thermosyphon. The experiment was carried out under steady operating pressures. The same work was also explored for traditional nanofluid (consisting of water and the same silica nanoparticles without functionalization) for comparison. Results indicate that a porous deposition layer exists on the heated surface of the evaporator during the operating process using traditional nanofluid; however, no coating layer exists for functionalized nanofluid. Functionalized nanofluid can enhance the evaporating heat transfer coefficient, while it has generally no effect on the maximum heat flux. Traditional nanofluid deteriorates the evaporating heat transfer coefficient but enhances the maximum heat flux. The existence of the deposition layer affects mainly the thermal performance, and no meaningful nanofluid effect is found in the present study
Levinson's theorem and scattering phase shift contributions to the partition function of interacting gases in two dimensions
We consider scattering state contributions to the partition function of a
two-dimensional (2D) plasma in addition to the bound-state sum. A partition
function continuity requirement is used to provide a statistical mechanical
heuristic proof of Levinson's theorem in two dimensions. We show that a proper
account of scattering eliminates singularities in thermodynamic properties of
the nonideal 2D gas caused by the emergence of additional bound states as the
strength of an attractive potential is increased. The bound-state contribution
to the partition function of the 2D gas, with a weak short-range attraction
between its particles, is found to vanish logarithmically as the binding energy
decreases. A consistent treatment of bound and scattering states in a screened
Coulomb potential allowed us to calculate the quantum-mechanical second virial
coefficient of the dilute 2D electron-hole plasma and to establish the
difference between the nearly ideal electron-hole gas in GaAs and the strongly
correlated exciton/free-carrier plasma in wide-gap semiconductors such as ZnSe
or GaN.Comment: 10 pages, 3 figures; new version corrects some minor typo
First-Principles Study of the Band Gap Structure of Oxygen-Passivated Silicon Nanonets
A net-like nanostructure of silicon named silicon nanonet was designed and oxygen atoms were used to passivate the dangling bonds. First-principles calculation based on density functional theory with the generalized gradient approximation (GGA) were carried out to investigate the energy band gap structure of this special structure. The calculation results show that the indirect–direct band gap transition occurs when the nanonets are properly designed. This band gap transition is dominated by the passivation bonds, porosities as well as pore array distributions. It is also proved that Si–O–Si is an effective passivation bond which can change the band gap structure of the nanonets. These results provide another way to achieve a practical silicon-based light source
Observation of the electromagnetic doubly OZI-suppressed decay
Using a sample of billion events accumulated with the BESIII
detector at the BEPCII collider, we report the observation of the decay , which is the first evidence for a doubly
Okubo-Zweig-Iizuka suppressed electromagnetic decay. A clear structure
is observed in the mass spectrum around 1.02 GeV/, which can
be attributed to interference between and
decays. Due to this interference, two
possible solutions are found. The corresponding measured values of the
branching fraction of are and .Comment: 7 pages, 4 figures, published in Phys. Rev.
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