6,075 research outputs found
Deep Descriptor Transforming for Image Co-Localization
Reusable model design becomes desirable with the rapid expansion of machine
learning applications. In this paper, we focus on the reusability of
pre-trained deep convolutional models. Specifically, different from treating
pre-trained models as feature extractors, we reveal more treasures beneath
convolutional layers, i.e., the convolutional activations could act as a
detector for the common object in the image co-localization problem. We propose
a simple but effective method, named Deep Descriptor Transforming (DDT), for
evaluating the correlations of descriptors and then obtaining the
category-consistent regions, which can accurately locate the common object in a
set of images. Empirical studies validate the effectiveness of the proposed DDT
method. On benchmark image co-localization datasets, DDT consistently
outperforms existing state-of-the-art methods by a large margin. Moreover, DDT
also demonstrates good generalization ability for unseen categories and
robustness for dealing with noisy data.Comment: Accepted by IJCAI 201
Clinical effect of intravenous thrombolysis combined with nicorandil therapy in patients with acute ST-segment elevation myocardial infarction
Purpose: To evaluate the effectiveness of intravenous thrombolysis in combination with nicorandil in the treatment of acute ST-segment elevation myocardial infarction (STEMI).Methods: Patients who developed acute STEMI and underwent intravenous thrombolysis in the hospital were selected and divided into observation group (n = 128) and control group (n = 114). Besides thrombolytic therapy, the observation group was also given 20 mg of nicorandil. The control group received conventional thrombolytic therapy only. Clinical effects and rehabilitation of patients were observed.Results: Cardiac troponin I (cTNI) level of the observation group was 4.0 ± 1.5, 8.3 ± 2.8 and 9.8 ± 3.9 after 4, 12 and 24 h, respectively, which is much lower than 5.8 ± 1.4, 11.4 ± 2.7 and 13.2 ± 4.2 in the control group (p < 0.05). ST-segment resolution of observation group was higher (44 ± 14, 52 ± 17, 69 ± 21 and 80 ± 18) % at different time points, compared with the control group (p < 0.05). The proportion of patients with Curtis-Walker score > 3 points, and ventricular wall motion score (4.70 %; 1.38 ± 0.11) in the observation group were both lower than those of the control group (21.00 %; 1.43 ± 0.15) (p < 0.05). The difference in adverse cardiac events between the observation group (N = 6, 4.70 %) and control group (N = 12, 10.50 %) was not statistically significant (p > 0.05)Conclusion: Combining intravenous thrombolysis with nicorandil therapy can enhance myocardial perfusion level, reduce myocardial damage, improve cardiac function and decrease risk of arrhythmia for acute STEMI patients.Keywords: ST-segment elevation, Myocardial infarction, Arrhythmia, Nicorandil, ST-segment, Thrombolytic therapy, Curtis-Walker scor
Study on properties of epoxy resin and polyurethane modified with organic silicon
In order to solve the problem of poor compatibility of traditional resins, improve its adhesion, toughness, corrosion, heat resistance, salt spray, and other properties of the coating, the epoxy resin and polyurethane was modified with organic silicon. Some modified methods were introduced and summarized, the prospects for the research development in the future were look forward
Study on the application of oligomers in paper reinforcement protection
In order to improve the strength of paper, solve the problem of poor permeability of traditional resins to paper, the low molecular weight hexamethylenediisocyanate (HDI) trimer was investigated, and the chemical and physical properties of paper samples were tested in this work. Results showed the paper treated by HDI trimer had good mechanical property, the tensile strength was increased from 1105 to 4151 N/m, the folding endurance was increased from 20.8 to 275; and had good glossiness and brightness. Therefore, the prepared HDI trimer has great application prospects in the protection of paper
Research progress on water-soluble chitosan
Chitosan has good film-forming property, adsorption, biocompatibility, biodegradability and antimicrobial properties, but it can only be dissolved in weak acidic aqueous solution and cannot be directly dissolved in water, which greatly limits its application. In order to increase its solubility in water, chitosan is modified, the research on the water-soluble derivatives of chitosan is reviewed in this paper, and its application in the protection of paper relics is briefly introduced.
Chitin is a kind of natural polysaccharide macromolecular polymer synthesized by biology in animals and plants, which mainly comes from shrimp shelsl, crab shells, insect shells and so on. Chitosan (CS) is obtained by deacetylation of chitin. The chitin is deacetylated under homogeneous conditions, and water-soluble product can be obtained by controlling the degree of deacetylation at about 50% [1]. The primary hydroxyl group, secondary hydroxyl group and amino group on the glucosamine unit in the chitosan molecular chain, with strong reactivity, which can be modified and embellished by functionalization to improve its solubility
Bis[[aquaÂ(1H-imidazo[4,5-f][1,10]phenanthroline-κ2 N 6,N 7)cadmium]bisÂ(μ-pyridine-2,3-dicarboxylÂato)-κ3 N,O 2:O 3;κ3 O 3:N,O 2]
In the title compound, [Cd2(C7H3NO4)2(C13H8N4)2(H2O)2], the CdII ion is six-coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (IP) ligand, one N atom and one O atom from a pyridine-2,3-dicarboxylÂate (pdc) ligand, one O atom from another pdc ligand and one water molÂecule in a distorted octaÂhedral geometry. Two CdII ions are bridged by a pair of pdc ligands, forming a centrosymmetric dinuclear structure. Neighboring dinuclear units are linked by the coordinated water molÂecules through O—H⋯N and O—H⋯O hydrogen bonds, forming a layer parallel to (011). The layers are further linked into a three-dimensional network through N—H⋯O hydrogen bonds. π–π interÂactions between the IP ligands further stabilize the supraÂmolecular structure [centroid–centroid distances = 3.579 (3), 3.686 (3), 3.710 (3), 3.766 (3) and 3.841 (3) Å]
Kinked linear response from non-Hermitian pumping
Non-Hermiticity is known to give rise to modified topological bulk-boundary
correspondences, which predict the presence of topological boundary modes
through appropriately modified topological invariants. Yet, little is currently
known about how non-Hermiticity affects the precise linear response of
wavepackets beyond their overall spectral flow. In this work, we discover that
generically, non-Hermiticity gives rise to abrupt and prominent kinks in the
semi-classical wavepacket trajectories of quantum gases, despite the absence of
sudden physical impulses. This physically stems from a hitherto
under-appreciated intrinsic non-locality from non-Hermitian pumping, even if
all physical couplings are local, thereby resulting in enigmatic singularities
in the band structure that lead to discontinuous band geometry and Berry
curvature. For concrete experimental demonstration, we propose an ultracold
atomic setup in a two-dimensional optical lattice with laser-induced loss, such
that response kinks can be observed without fine-tuning in the physical atomic
cloud dynamics. Our results showcases unique non-monotonic behavior from
non-Hermitian pumping beyond the non-Hermitian skin effect, and suggests new
avenues for investigating non-Hermitian dynamics in ultracold atomic platforms.Comment: 21 pages, 7 figure
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