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1. chinaXiv:202006.00176 [pdf]

Automated Radiological Impression Generation for Plain Chest X-rays with End to End Deep Learning

Zhang, Shuai; Xin, Xiaoyan; Shen, Jingtao; Guo, Yachong; Wang, Yang; Yang, Xianfeng; Wang, Jun; Zhang, Jian; Zhang, Bing
Subjects: Computer Science >> Other Disciplines of Computer Science

The chest X-Ray (CXR) is the one of the most common clinical exam used to diagnose thoracic diseases and abnormalities. The volume of CXR scans generated daily in hospitals is huge. Therefore, an automated diagnosis system that is able to save the effort of doctors is of great value. At present, the applications of artificial intelligence in CXR diagnosis usually use pattern recognition to classify the scans. However, such methods rely on labeled databases. They are costly and usually have a high error rate. In this work, we built a database containing more than 12,000 CXR scans and radiological reports, and developed a model based on deep convolutional neural network and recurrent network with attention mechanism. The model learns features from the CXR scans and the associated raw radiological reports directly; no additional labeling required. The model provides automated recognition of given scans and generation of impression. The quality of the generated impression was evaluated with both the CIDEr scores and by radiologists as well. The CIDEr scores were found to be around 5.8 on average for the testing dataset. Further blind evaluation suggested a comparable performance against radiologists.

submitted time 2020-06-09 Hits3816Downloads178 Comment 0

2. chinaXiv:201711.00159 [pdf]

Theoretical Studies on the Excited-state Properties of Ru(II) Polypyridyl Complexe

ZHANG Jian-Fu; MIAO Ti-Fang; ZHANG Zhi-Qiang; LI Shuang; LUO Yao
Subjects: Chemistry >> Physical Chemistry

Using DFT/TDDFT methods, the excited-state lifetimes of Ru(II) polypyridyl complexes were computed accurately and the reason of Ru(II) polypyridyl complexes with long excited-state lifetimes was explained by the electron?transfer distances and HOMO-LUMO gaps. Finally, the photovoltaic conversion efficiencies of complexes were predicted using DFT and docking methods. This work has provided methods of predicting the excited-state lifetimes and photovoltaic conversion efficiencies of Ru(II) polypyridyl complexes

submitted time 2017-11-05 From cooperative journals:《结构化学》 Hits472Downloads265 Comment 0

3. chinaXiv:201705.00581 [pdf]

Effect of Yb3+ on the Crystal Structural Modification and Photoluminescence Properties of GGAG:Ce3+

Luo, ZH [Luo, Zhao-Hua][ 1 ]; Liu, YF [Liu, Yong-Fu][ 1 ]; Zhang, CH [Zhang, Chang-Hua][ 1,2 ]; Zhang, JX [Zhang, Jian-Xin][ 1,3 ]; Qin, HM [Qin, Hai-Ming][ 1 ]; Jiang, HC [Jiang, Hao-Chuan][ 1 ]; Jiang, J [Jiang, Jun][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Gadolinium gallium aluminum garnet (GGAG) is a very promising host for the highly efficient luminescence of Ce3+ and shows potential in radiation detection applications. However, the thermodynamically metastable structure would be slanted against it from getting high transparency. To stabilize the crystal structure of GGAG, Yb3+ ions were codoped at the Gd3+ site. It is found that the decomposition of garnet was suppressed and the transparency of GGAG ceramic was evidently improved. Moreover, the photo- luminescence of GGAG:Ce3+,xYb3+ with different Yb3+ contents has been investigated. When the Ce3+ ions were excited under 475 nm, a typical near-infrared region emission of Yb3+ ions can be observed, where silicon solar cells have the strongest absorption. Basing on the lifetimes of Ce3+ ions in the GGAG:Ce3+,xYb3+ sample, the transfer efficiency from Ce3+ to Yb3+ and the theoretical internal quantum efficiency can be calculated and reach up to 86% and 186%, respectively. This would make GGAG:Ce3+,Yb3+ a potential attractive downconversion candidate for improving the energy conversion efficiency of crystalline silicon (c-Si) solar cells.

submitted time 2017-05-02 Hits643Downloads273 Comment 0

4. chinaXiv:201705.00532 [pdf]

Ozone-Mediated Functionalization of Multi-Walled Carbon Nanotubes and Their Activities for Oxygen Reduction Reaction

Xia, HH [Xia, Hengheng][ 1,2 ]; Zhang, YX [Zhang, Yexin][ 2 ]; Chen, CL [Chen, Chunlin][ 2 ]; Wu, WL [Wu, Wenlin][ 2 ]; Yao, K [Yao, Ken][ 1 ]; Zhang, J [Zhang, Jian][ 2 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

The functionalization of multi-walled carbon nanotubes (MWCNTs) by ozone treatment has been sys- tematically investigated by using Raman spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), organic elemental anal- ysis (OEA) and Boehm titration. The results showed that the functionalization process occurred at defective sites (opened mouths, tube caps, debris, etc.) before opening caps and truncating walls, and finally the graphitic structure was deteriorated. The surface oxygen content first increased with the treatment time but kept at around 8.0 wt% after 5 h. The analysis of the distribution of oxygen-containing groups re- vealed that phenolic hydroxyl was gradually converted to carboxyl and lactone. The carboxyl was found to play a pivotal role to reduce the over-potentials when we used the functionalized MWCNTs as the cat- alyst for oxygen reduction reaction (ORR).

submitted time 2017-05-02 Hits720Downloads317 Comment 0

5. chinaXiv:201705.00514 [pdf]

A co-confined carbonization approach to aligned nitrogen-doped mesoporous carbon nanofibers and its application as an adsorbent

Chen, AB [Chen, Aibing][ 1 ]; Liu, C [Liu, Chao][ 2 ]; Yu, YF [Yu, Yifeng][ 1 ]; Hu, YQ [Hu, Yongqi][ 1 ]; Lv, HJ [Lv, Haijun][ 1 ]; Zhang, Y [Zhang, Yue][ 1 ]; Shen, SF [Shen, Shufeng][ 1 ]; Zhang, J [Zhang, Jian][ 3 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Nitrogen-doped carbon nanofibers (MCNFs) with an aligned mesoporous structure were synthesized by a co-confined carbonization method using anodic aluminum oxide (AAO) membrane and tetraethy- lorthosilicate (TEOS) as co-confined templates and ionic liquids as the precursor. The as-synthesized MCNFs with the diameter of 80–120 nm possessed a bulk nitrogen content of 5.3 wt% and bimodal meso- porous structure. The nitrogen atoms were mostly bound to the graphitic network in two forms, i.e. pyridinic and pyrrolic nitrogen, providing adsorption sites for acidic gases like SO2 and CO2 . Cyclic exper- iments revealed a considerable stability of MCNFs over 20 runs of SO2 adsorption and 15 runs for CO2 adsorption. The MCNFs also have a preferable adsorption performance for Cd2+.

submitted time 2017-05-02 Hits715Downloads312 Comment 0

6. chinaXiv:201705.00491 [pdf]

On the magnetic structure of [Fe1-xMnx]Pt: A first-principles study

Luo, HB [Luo, Hu-Bin][ 1,2 ]; Xia, WX [Xia, Wei-Xing][ 1,2 ]; Du, J [Du, Juan][ 1,2 ]; Zhang, J [Zhang, Jian][ 1,2 ]; Liu, JP [Liu, J. Ping][ 3 ]; Yan, A [Yan, Aru][ 1,2 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

This study investigates the composition dependence of magnetic structures of (Fe1?xMnx)Pt using first- principles method. A series of possible magnetic configurations are considered in the calculation to compare the relative stabilities after structural optimization, based on which, together with the com- parison between theoretical and experimental magnetic properties, the results largely support the ex- perimental finding in powders. The experimentally found stability of ferrimagnetic state in films with a wide composition range of x ≤ 0.5 is not fully supported by this study. The composition-dependent magnetic structures are discussed according to the exchange interactions.

submitted time 2017-05-02 Hits615Downloads296 Comment 0

7. chinaXiv:201705.00422 [pdf]

Sub-10 nm rutile titanium dioxide nanoparticles for efficient visible-light-driven photocatalytic hydrogen production

Li, LD [Li, Landong][ 1,2 ]; Yan, JQ [Yan, Junqing][ 1,2 ]; Wang, T [Wang, Tuo][ 1,3 ]; Zhao, ZJ [Zhao, Zhi-Jian][ 1,3 ]; Zhang, J [Zhang, Jian][ 4 ]; Gong, JL [Gong, Jinlong][ 1,3 ]; Guan, NJ [Guan, Naijia][ 1,2 ]

Titanium dioxide is a promising photocatalyst for water splitting, but it suffers from low visible light activity due to its wide band gap. Doping can narrow the band gap of titanium dioxide; however, new charge-carrier recombination centres may be introd

submitted time 2017-05-02 Hits332Downloads168 Comment 0

8. chinaXiv:201705.00293 [pdf]

Aqueous-phase synthesis of nitrogen-doped ordered mesoporous carbon nanospheres as an efficient adsorbent for acidic gases

Chen, AB [Chen, Aibing][ 1 ]; Yu, YF [Yu, Yifeng][ 1 ]; Zhang, Y [Zhang, Yue][ 1 ]; Zang, WW [Zang, Wenwei][ 1 ]; Yu, YH [Yu, Yunhong][ 1 ]; Zhang, YX [Zhang, Yexin][ 2 ]; Shen, SF [Shen, Shufeng][ 1 ]; Zhang, J [Zhang, Jian][ 2 ]

Nitrogen-doped ordered mesoporous carbon spheres [N-OMCs] were conveniently produced by using a soluble urea-phenol-formaldehyde resin as the precursor and triblock copolymer F127 as a soft template. The obtained carbon spheres with a mean diameter of aro

submitted time 2017-05-02 Hits415Downloads255 Comment 0

9. chinaXiv:201703.00621 [pdf]

On two cryogenic systems of high purity germanium detector

Zhang Jian-Yong; Cai Xiao; MO Xiao-Hu
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

Two cryogenic systems of high purity germanium detector, liquid nitrogen and mechanical coolers, are expound, together with explanations of merits and demerits for each kind of cooling methods. The resolutions of detector to the characteristic lines of 152Eu under different cooling conditions are studied. The laboratory results indicate that the mechanical cooler (X-Cooler II) is an ideal replacement candidate for the liquid nitrogen cooler that is being utilized by BEMS at BEPC-II.

submitted time 2017-03-26 Hits12577Downloads991 Comment 0

10. chinaXiv:201609.00791 [pdf]

Spectrum and Bethe-Salpeter amplitudes of $\Omega$ baryons from lattice QCD

Liang, Jian and Sun, Wei and Chen, Ying and Qiu, Wei-Feng; and Gong, Ming and Liu, Chuan and Liu, Yu-Bin and Liu,; Zhaofeng and Ma, Jian-Ping and Zhang, Jian-Bo
Subjects: Physics >> Nuclear Physics

The?Ω?baryons with?JP=3/2±,1/2±?are studied on the lattice in the quenched approximation. Their mass levels are ordered as?M3/2+

submitted time 2016-09-12 Hits819Downloads462 Comment 0

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