2017
2017
-
Record 541 of
Title:Leveraging Spatial Context Disparity for Power Line Detection
Author(s):Pan, Chaofeng(1,4); Shan, Haotian(1,4); Cao, Xianbin(1); Li, Xuelong(2,3); Wu, Dapeng(1,5)Source: Cognitive Computation Volume: 9 Issue: 6 DOI: 10.1007/s12559-017-9488-y Published: December 1, 2017Abstract:For the safety of low flying aircraft, it will become increasingly important that an aircraft should have the ability to detect and avoid small obstacles in the low flying environment. In recent years, using context information to assist in detecting power lines has shown great potential to better detect power lines at a remote distance. Therefore, how to adequately use the context information for a better detection is a hot issue of concern. This paper proposes a novel auxiliary assisted power line detection method, in which the spatial context disparity of auxiliaries is quantitatively and uniformly evaluated for the first time. As a cognitive strategy, the spatial context disparity depends on two factors, the spatial context peakedness and the spatial context difference. With this cognitive method, objects that achieve high spatial context disparity scores are more suitable for being the auxiliaries of the power lines. Experimental results show that, owing to the spatial context disparity, the proposed method can acquire proper auxiliaries with abundant context information to support the detection, so that better power line detections are achieved comparing to traditional power line detection methods. The proposed power line detection method, which can automatically choose the optimal auxiliaries, is effective and has the potential for practical use in ensuring the flight safety of unmanned air vehicles (UAVs) in the low flying environment. ? 2017, Springer Science+Business Media, LLC.Accession Number: 20173104011751 -
Record 542 of
Title:Packaging IGBT modules by rapid sintering of nanosilver paste in a current way
Author(s):Xie, Yijing(1); Mei, Yunhui(1); Feng, Shuangtao(1); Zhang, Pu(2); Zhang, Long(3); Yang, Yingkun(3)Source: 2017 International Conference on Electronics Packaging, ICEP 2017 Volume: Issue: DOI: 10.23919/ICEP.2017.7939336 Published: June 5, 2017Abstract:Rapid sintering of nanosilver paste had been proposed to bond power chips in our previous work. It seems a potential good way to improve the efficiency of power module manufacturing because of the much shorter sintering time, i.e., 15 seconds. In this study, we tried the way of rapid sintering of nanosilver paste for bonding power chips in order to verify the feasibility of the rapid sintering method. Both the static and the dynamic performance of the IGBT modules using rapid sintered nanosilver as die attachment have been characterized at both room temperature and 150oC. The results shows that this rapid sintering way could be used to bond power chips in a much shorter time to fabricate IGBT modules using nanosilver paste because of the comparable static and dynamic electrical properties as those of commercial IGBT modules with the same power rating from MacMic and Infineon. ? 2017 Japan Institute of Electronics Packaging.Accession Number: 20172703875075 -
Record 543 of
Title:Facile synthesis of porous nitrogen-doped holey graphene as an efficient metal-free catalyst for the oxygen reduction reaction
Author(s):Qin, Li(1,2,5); Ding, Ruimin(1,2); Wang, Huixiang(1,2,5); Wu, Jianghong(1,2,5); Wang, Conghui(1,2,5); Zhang, Chenghua(1,3); Xu, Yao(4); Wang, Liancheng(1,2); Lv, Baoliang(1,2)Source: Nano Research Volume: 10 Issue: 1 DOI: 10.1007/s12274-016-1293-5 Published: January 1, 2017Abstract:Nitrogen-doped graphene is a promising candidate for the replacement of noble metal-based electrocatalysts for oxygen reduction reactions (ORRs). The addition of pores and holes into nitrogen-doped graphene enhances the ORR activity by introducing abundant exposed edges, accelerating mass transfer, and impeding aggregation of the graphene sheets. Herein, we present a straightforward but effective strategy for generating porous holey nitrogen-doped graphene (PHNG) via the pyrolysis of urea and magnesium acetate tetrahydrate. Due to the combined effects of the in situ generated gases and MgO nanoparticles, the synthesized PHNGs featured not only numerous out-of-plane pores among the crumpled graphene sheets, but also interpenetrated nanoscale (5–15 nm) holes in the assembled graphene. Moreover, the nitrogen doping configurations of PHNG were optimized by post-thermal treatments at different temperatures. It was found that the overall content of pyridinic and quaternary nitrogen positively correlates with the ORR activity; in particular, pyridinic nitrogen generates the most desirable characteristics for the ORR. This work reveals new routes for the synthesis of PHNG-based materials and elucidates the contributions of various nitrogen species to ORRs. [Figure not available: see fulltext.] ? 2017, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.Accession Number: 20164302942143 -
Record 544 of
Title:A novel 3-D calorimeter for the high energy cosmic-radiation detection (HERD) facility onboard China's future space station
Author(s):Dong, Yongwei(1,3); Xu, Ming(1); Wang, Zhigang(1); Adriani, Oscar(1,3); Albergo, Sebastiano(6); Ambrosi, Giovanni(7); Azzarello, Philippe(8,9,10); Bai, Yonglin(2); Bao, Tianwei(11); Bernardini, Paolo(17); Bertucci, Bruna(14); Bi, Xiaojun(16); Bongi, Massimo(13); Bottai, Sergio(15); Cao, Weiwei(2); Chai, Junying(1,3,18); Chen, Zhen(2); D'Alessandro, Raffaello(13); Di Santo, Margherita(12); Duranti, Matteo(7); Fang, Kun(1); Feng, Hua(4); Formato, Valerio(7); Fusco, Piergiorgio(18); Gao, Jiarui(2); Gargano, Fabio(15); Giglietto, Nicola(18); Hu, Peng(1,3); Li, Ran(2); Li, Yong(2); Lin, Sujie(1); Liu, Hongbang(5); Liu, Xin(1,3); Loparco, Francesco(18); Lyu, Junguang(1); Marsella, Giovanni(17); Mazziottai, Mario Nicola(15); De Mitri, Ivan(17); Mori, Nicola(15); Papini, Paolo(15); Peng, Wenxi(1); Pohl, Martin(8); Quan, Zheng(1); Shi, Dalian(2); Sun, Xin(2); Surdo, Antonio(12); Vannuccini, Elena(15); Walter, Roland(8); Wang, Bingbing(1); Wang, Bo(2); Wang, Junjing(1,3); Wang, Le(2); Wang, Ruijie(1); Wu, Bobing(1); Wu, Qiong(4); Wu, Xin(8); Zhang, Li(1); Zhang, Shuangnan(1)Source: Proceedings of Science Volume: Issue: DOI: Published: 2017Abstract:The High Energy cosmic-Radiation Detection (HERD) facility is a flagship and landmark scientific experiment onboard China's Space Station, planned for operation starting around 2025 for about 10 years. The main instrument of HERD is a 3-D calorimeter (CALO) sensitive to incident gamma-rays and particles from five sides. With this design, the effective geometric factor of HERD is more than one order of magnitude larger than that of previous missions. CALO is made of about 7,500 cubes of LYSO crystals, corresponding to about 55 radiation lengths and 3 nuclear interaction lengths, respectively. The crystal signals are transferred by wavelength shifting fibers and read out by ISCMOS devices. Energy deposition in each crystal is then derived by summing up about 400 CMOS pixels and with necessary correction for light saturation. Both a low range ISCMOS and a high range one are required to meet the requirement of a large dynamic range of at least 10 million. The prototype of CALO has been tested successfully in November 2015 at CERN, which leads to an improved design of CALO. ? Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).Accession Number: 20181605026794 -
Record 545 of
Title:Coherent optical adaptive technique improves the spatial resolution of STED microscopy in thick samples
Author(s):Yan, Wei(1,2); Yang, Yanlong(3); Tan, Yu(2); Chen, Xun(2); Li, Yang(2); Qu, Junle(1); Ye, Tong(2,4)Source: Photonics Research Volume: 5 Issue: 3 DOI: 10.1364/PRJ.5.000176 Published: June 1, 2017Abstract:Stimulated emission depletion (STED) microscopy is one of far-field optical microscopy techniques that can provide sub-diffraction spatial resolution. The spatial resolution of the STED microscopy is determined by the specially engineered beam profile of the depletion beam and its power. However, the beam profile of the depletion beam may be distorted due to aberrations of optical systems and inhomogeneity of a specimen’s optical properties, resulting in a compromised spatial resolution. The situation gets deteriorated when thick samples are imaged. In the worst case, the severe distortion of the depletion beam profile may cause complete loss of the super-resolution effect no matter how much depletion power is applied to specimens. Previously several adaptive optics approaches have been explored to compensate aberrations of systems and specimens. However, it is difficult to correct the complicated high-order optical aberrations of specimens. In this report, we demonstrate that the complicated distorted wavefront from a thick phantom sample can be measured by using the coherent optical adaptive technique. The full correction can effectively maintain and improve spatial resolution in imaging thick samples. ? 2017 Chinese Laser Press.Accession Number: 20182705409250 -
Record 546 of
Title:Self-assembled high-performance graphene oxide fibers using ionic liquid as coagulating agent
Author(s):Zhang, Dong(1); Peng, Li(2); Shi, Naien(1); Yu, Youhai(3); Min, Yonggang(1); Epstein, Arthur J.(4,5)Source: Journal of Materials Science Volume: 52 Issue: 13 DOI: 10.1007/s10853-017-1050-5 Published: July 1, 2017Abstract:An efficient strategy for fabricating high-performance GO fibers (GFs) by using ionic liquids as coagulating agent via wet-spinning technique was reported for the first time. The interactions between the functional groups of the GO sheets and the ionic liquids cations could be tuned by choosing ionic liquids cations with designed structure, yielding GFs with varied mechanical properties. No organic solvent or postdrawing processes involved makes this process green and facile. ? 2017, Springer Science+Business Media New York.Accession Number: 20171403539961 -
Record 547 of
Title:Formation, element-migration and broadband luminescence in quantum dot-doped glass fibers
Author(s):Huang, Xiongjian(1); Fang, Zaijin(1,2); Peng, Zixing(1); Ma, Zhijun(1); Guo, Haitao(3); Qiu, Jianrong(4); Dong, Guoping(1)Source: Optics Express Volume: 25 Issue: 17 DOI: 10.1364/OE.25.019691 Published: August 21, 2017Abstract:All solid-state PbS quantum dot (QD)-doped glass precursor fibers avoidingcrystallizationduring fiber-drawing process are successfully fabricated by melt-in-tubetechnique.By subsequent heat treatment schedule, controllable crystallization ofPbS QDscan be obtained in the glass precursor fibers, contributing to broad near-infraredemissionsfrom PbS QD-doped glass fibers. Nevertheless, we find that element-migrationandvolatilization of sulfur simultaneously happen during the whole fiber-drawingprocess,because of the huge difference between the melting temperature of core glassandthe fiber-drawing temperature. Element-migration pathways along the fiber lengthwererevealed. Such PbS QD-doped glass fiber with broadband emissions will be a potentialapplicationas gain medium of broadband fiber amplifiers and fiber lasers. ? 2017 Optical Society of America.Accession Number: 20173404070850 -
Record 548 of
Title:Introduction to the high energy cosmic-radiation detection (HERD) facility onboard China's future space station
Author(s):Zhang, Shuang-Nan(1,3); Adriani, Oscar(12); Albergo, Sebastiano(6); Ambrosi, Giovanni(7); An, Qi(27); Azzarello, Philippe(8); Bai, Yonglin(9); Bao, Tianwei(10); Bernardini, Paolo(17); Bertucci, Bruna(13); Bi, Xiaojun(1); Bongi, Massimo(12); Bottai, Sergio(15); Cao, Weiwei(2); Cao, Zhen(1); Chai, Junying(1,3); Chang, Jin(28); Chen, Guoming(1); Chen, Y.(21); Chen, Zhen(2); Cui, X.H.(22); Dai, Z.G.(21); D'Alessandro, Raffaello(12); Di Santo, Margherita(11); Dong, Yongwei(1); Duranti, Matteo(7); Fan, Y.Z.(28); Fang, Kun(1); Feng, C.Q.(27); Feng, Hua(4); Formato, Valerio(7); Fusco, Piergiorgio(18); Gao, Jiarui(2); Gargano, Fabio(14); Giglietto, Nicola(18); Gou, Q.B.(1); Guo, Y.Q.(1); He, H.H.(1); Hu, H.B.(1); Hu, Peng(1,3); Huang, G.S.(27); Huang, J.(1); Huang, Y.F.(21); Li, H.(1); Li, Ran(2); Li, Yong(2); Li, Z.(23); Liang, E.W.(5); Lin, Sujie(1); Liu, H.(1); Liu, Hongbang(5); Liu, J.B.(27); Liu, S.B.(27); Liu, S.M.(28); Liu, Xin(1,3); Loparco, Francesco(18); Lyu, Junguang(1); Marsella, Giovanni(17); Mazziottai, Mario Nicola(14); De Mitri, Ivan(17); Mori, Nicola(15); Papini, Paolo(15); Pearce, Mark(19); Peng, Wenxi(1); Pohl, Martin(8); Quan, Zheng(1); Ryde, Felix(19); Shi, Dalian(2); Su, Meng(20); Sun, X.L.(1); Sun, Xin(2); Surdo, Antonio(11); Tang, Z.C.(1); Vannuccini, Elena(15); Walter, Roland(8); Wang, Bingbing(16); Wang, Bo(2); Wang, J.C.(24); Wang, J.M.(1); Wang, Junjing(1,3); Wang, Le(2); Wang, Ruijie(1); Wang, X.L.(27); Wang, X.Y.(21); Wang, Zhigang(1); Wei, D.M.(28); Wu, Bobing(1); Wu, J.(25); Wu, Qiong(4); Wu, Xin(8); Wu, X.F.(28); Xu, Ming(1); Xu, Z.Z.(27); Yan, H.R.(23); Yin, P.F.(1); Yu, Y.W.(26); Yuan, Q.(28); Zha, M.(1); Zhang, L.(1); Zhang, Li(1); Zhang, Y.(1); Zhang, Y.L.(27); Zhao, Z.G.(27)Source: Proceedings of Science Volume: Issue: DOI: Published: 2017Abstract:The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads onboard China's Space Station, which is planned for operation starting around 2025 for about 10 years. The main scientific objectives of HERD are searching for signals of dark matter annihilation products, precise cosmic electron (plus positron) spectrum and anisotropy measurements up to 10 TeV, precise cosmic ray spectrum and composition measurements up to the knee energy, and high energy gamma-ray monitoring and survey. HERD is composed of a 3-D cubic calorimeter (CALO) surrounded by microstrip silicon trackers (STKs) from five sides except the bottom. CALO is made of about 7,500 cubes of LYSO crystals, corresponding to about 55 radiation lengths and 3 nuclear interaction lengths, respectively. The top STK microstrips of six X-Y layers are sandwiched with tungsten converters to make precise directional measurements of incoming electrons and gamma-rays. In the baseline design, each of the four side STKs is made of only three layers microstrips. All STKs will also be used for measuring the charge and incoming directions of cosmic rays, as well as identifying back scattered tracks. With this design, HERD can achieve the following performance: energy resolution of 1% for electrons and gamma-rays beyond 100 GeV and 20% for protons from 100 GeV to 1 PeV; electron/proton separation power better than 10-5; effective geometrical factors of >3 m2sr for electron and diffuse gamma-rays, >2 m2sr for cosmic ray nuclei. R&D is under way for reading out the LYSO signals with optical fiber coupled to image intensified IsCMOS and CALO prototype of 250 LYSO crystals. ? Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).Accession Number: 20181605026929 -
Record 549 of
Title:Demonstration of on-chip multi-mode phase-sensitive amplification
Author(s):Zhang, Y.(1); Reimer, C.(1); Wu, J.(1); Roztocki, P.(1); Wetzel, B.(1); Little, Brent E.(2); Chu, S.T.(3); Moss, D.J.(4); Kues, M.(1); Morandotti, R.(1,5)Source: Optics InfoBase Conference Papers Volume: Part F81-EQEC 2017 Issue: DOI: 10.1109/cleoe-eqec.2017.8087560 Published: 2017Abstract:nullAccession Number: 20180104605344 -
Record 550 of
Title:Multi-channel phase-sensitive amplification in nonlinear waveguides
Author(s):Zhang, Y.(1); Reimer, C.(1); Wu, J.(1); Roztocki, P.(1); Wetzel, B.(1,2); Little, B.E.(3); Chu, S.T.(4); Moss, D.J.(5); Kues, M.(1,6); Morandotti, R.(1,7)Source: Optics InfoBase Conference Papers Volume: Part F43-CLEO_AT 2017 Issue: DOI: 10.1364/CLEO_AT.2017.JTh2A.91 Published: 2017Abstract:We demonstrate on-chip multi-channel phase-sensitive amplification in a nonlinear waveguide, achieving 5 dB net gain and 15 dB extinction ratio. We show the manipulation of individual channels in a multi-channel scheme through controlling the initial phases. ? 2017 OSA.Accession Number: 20172403763268 -
Record 551 of
Title:Towards On-Chip Integrated Optical Quantum Frequency Combs
Author(s):Caspani, Lucia(1,2); Reimer, Christian(1); Kues, Michael(1); Roztocki, Piotr(1); Clerici, Matteo(1,3); Wetzel, Benjamin(1,4); Jestin, Yoann(1); Ferrera, Marcello(1,2); Peccianti, Marco(1,4); Pasquazi, Alessia(1,4); Razzari, Luca(1); Little, Brent E.(5); Chu, Sai T.(6); Moss, David J.(7); Morandotti, Roberto(1,8)Source: arXiv Volume: Issue: DOI: Published: October 2, 2017Abstract:Recent development in quantum photonics allowed to start the process of bringing photonic-quantum-based systems out of the lab into real world applications. As an example, devices for the exchange of a cryptographic key secured by the law of quantum mechanics are currently commercially available. In order to further boost this process, the next step is to migrate the results achieved by means of bulky and expensive setups to miniaturized and affordable devices. Integrated quantum photonics is exactly addressing this issue. In this paper we briefly review the most recent advancements in the generation of quantum states of light (at the core of quantum cryptography and computing) on chip. In particular, we focus on optical microcavities, as they can offer a solution to the issue of low efficiency (low number of photons generated) typical of the materials mostly used in integrated platforms. In addition, we show that specifically designed microcavities can also offer further advantages, such as compatibility with existing telecom standard (thus allowing to exploit the existing fiber network) and quantum memories (necessary in turns to extend the communication distance), as well as longitudinal multimode character. This last property (i.e. the increased dimensionality necessary for describing the quantum state of a photon) is achieved thanks to the generating multiple photon pairs on a frequency comb corresponding to the microcavity resonances. Further achievements include the possibility to fully exploit the polarization degree of freedom also for integrated devices. These results pave the way to the generation of integrated quantum frequency combs, that in turn may find application as quantum computing platform. Copyright ? 2017, The Authors. All rights reserved.Accession Number: 20200247564