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Broadband downshifting luminescence in Cr³⁺-Yb³⁺ codoped garnet for efficient photovoltaic generation

OPTICS EXPRESS 2013年第4期21卷 4167-4173页

作者： Ye, Song Zhou, Jiajia Wang, Shiting Hu, Rongxuan Wang, Deping Qiu, Jianrong Tongji Univ Sch Mat Sci & Engn Shanghai 201806 Peoples R China Zhejiang Univ State Key Lab Silicon Mat Hangzhou 310027 Zhejiang Peoples R China S China Univ Technol Inst Opt Commun Mat Guangzhou 510640 Guangdong Peoples R China S China Univ Technol State Key Lab Luminescent Mat & Devices Guangzhou 510640 Guangdong Peoples R China

The Cr3+-Yb3+ codoped YAG crystals were synthesized by the solid state reaction method, in which the intense near-infrared emission around 1000 nm originated from Yb3+ F-2(5/2) -> (2)F(7/)2 transition was obtained due to the efficient energy transfer from Cr3+ to Yb3+. The stable and transient spectral measurements revealed that the phonon assistant energy transfer process is responsible for the energy transfer from Cr3+ to Yb3+ upon both the excitations of Cr3+: T-4(1) and T-4(2) energy levels. Due to the effective absorption of Cr3+ in the visible region in YAG and the efficient energy transfer to Yb3+, this material can be developed as spectral convertors to improve silicon solar cell photovoltaic conversion efficiency. (C)2013 Optical Society of America

关键词： Energy transfer Ions Luminescent materials Silicon solar cells Solar radiation X ray diffraction

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Landslide Investigation with Remote Sensing and Sensor Network: From Susceptibility Mapping and Scaled-down Simulation towards in situ Sensor Network Design

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REMOTE SENSING 2013年第9期5卷 4319-4346页

作者： Qiao, Gang Lu, Ping Scaioni, Marco Xu, Shuying Tong, Xiaohua Feng, Tiantian Wu, Hangbin Chen, Wen Tian, Yixiang Wang, Weian Li, Rongxing Tongji Univ Coll Surveying & Geoinformat Ctr Spatial Informat Sci & Sustainable Dev Applic Shanghai 200092 Peoples R China Ohio State Univ Mapping & GIS Lab Columbus OH 43210 USA

This paper presents an integrated approach to landslide research based on remote sensing and sensor networks. This approach is composed of three important parts: (i) landslide susceptibility mapping using remote-sensing techniques for susceptible determination of landslide spots;(ii) scaled-down landslide simulation experiments for validation of sensor network for landslide monitoring, and (iii) in situ sensor network deployment for intensified landslide monitoring. The study site is the Taziping landslide located in Hongkou Town (Sichuan, China). The landslide features generated by landslides triggered by the 2008 Wenchuan Earthquake were first extracted by means of object-oriented methods from the remote-sensing images before and after the landslides events. On the basis of correlations derived between spatial distribution of landslides and control factors, the landslide susceptibility mapping was carried out using the Artificial Neural Network (ANN) technique. Then the Taziping landslide, located in the above mentioned study area, was taken as an example to design and implement a scaled-down landslide simulation platform in Tongji University (Shanghai, China). The landslide monitoring sensors were carefully investigated and deployed for rainfall induced landslide simulation experiments. Finally, outcomes from the simulation experiments were adopted and employed to design the future in situ sensor network in Taziping landslide site where the sensor deployment is being implemented.

关键词： landslide sensor network susceptibility mapping remote sensing

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Fatigue behaviors prediction method of welded joints based on soft computing methods

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MATERIALS SCIENCE AND engineering A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 2013年 559卷 574-582页

作者： Yang, Xinhua Deng, Wu Zou, Li Zhao, Huimin Liu, Jingjing Dalian Jiaotong Univ Sch Mat Sci & Engn Dalian 116028 Peoples R China Dalian Jiaotong Univ Software Inst Dalian 116052 Peoples R China

In allusion to the highly nonlinear, multivariable, strong coupling and interaction of various factors of the welded process, it is difficult to predict the fatigue behaviors of welded joints. We make use of the capabilities and advantages of rough set theory, ant colony algorithm and BP neural network, a novel fatigue behaviors prediction method (RST-ACO-BPNN) of welded joints based on RST, ACO and BPNN is proposed in this paper. The proposed RST-ACO-BPNN method utilizes the knowledge reduction ability of rough set theory for dealing with the original fatigue sample data, the minimum fatigue feature subset is obtained. The ant colony algorithm with the ability of strong global search was used to optimize the weights of BP neural network for obtaining the optimized BP neural network model. Then the minimum reduced subset was inputted into the optimized BP neural network model to construct the novel fatigue behaviors prediction model of welded joints by the continuous training and adjusting. To verify the correctness and validity of the novel RST-ACO-BPNN prediction model by applying in aluminum alloy welded joints. The simulation results show the proposed method can predict effectively the fatigue behaviors of aluminum alloy welded joints. And the RST-ACO-BPNN prediction method is provided with the merits of building model easily, simple structure, high precision and good generalization. Consequently, the prediction method can provide an effective approach to predict the fatigue behaviors of welded joints. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

关键词： Rough set theory Ant colony algorithm BP neural network Soft computing methods Fatigue behaviors prediction method Welded joints

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An efficient quantum meet-in-the-middle attack against NTRU-2005

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Chinese Science Bulletin 2013年第28期58卷 3514-3518页

作者： WANG Hong MA Zhi MA ChuanGui State Key Laboratory of Mathematical Engineering and Advanced Computing

NTRU is one of the most widely used public-key cryptosystems and its security has been an active research *** paper proposes a new way to find NTRU-2005 private *** algorithm is based on meet-in-the-middle attack and a quantum algorithm for searching the fixed weight *** with the current classical and quantum meet-in-the-middle attacks,our algorithm has lower time and space ***,this attack can also be applied against different versions of *** result can help to understand the security of NTRU better.

关键词：中间人攻击量子算法 NTRU 空间复杂度公钥密码安全性私钥搜索

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INTEGRATED EVALUATION OF COST, SCHEDULE AND EMISSION PERFORMANCE ON ROCK-FILLED CONCRETE DAM CONSTRUCTION OPERATION USING DISCRETE EVENT SIMULATION

INTEGRATED EVALUATION OF COST, SCHEDULE AND EMISSION PERFORM...

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Winter Simulation Conference on Simulation - Making Decisions in a Complex World

作者： Liu, Chunna An, Xuehui Ahn, Changbum R. Lee, SangHyun Tsinghua Univ State Key Lab Hydro Sci & Engn Beijing 100084 Peoples R China

ISBN: (纸本)9781479939503;9781479920778

Massive concrete dam projects will be conducted in the next ten years to respond to the increasing demand for clean energy and water resources in developing countries. With more attention paid to environmental issues, there is an increasing need to develop a methodology for reliably predicting the integrated performance of cost, schedule and emission factors in the planning stage. In this paper, we propose a methodology for using discrete event simulation (DES) for dam construction processes to enhance the performance dynamically. A case study is conducted to demonstrate the effectiveness of the DES model, which is validated by the actual cumulative progress on the construction site. The results indicate that the cost, schedule and emission performance are highly interactively correlated when using RFC in dam projects. The promoted methodology could help construction managers compare the integrated performance of different options in RFC dam constructions.

关键词： Discrete event simulation

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Effective synthesis to control the growth of polyaniline nanofibers by interfacial polymerization

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SYNTHETIC METALS 2013年 171卷 39-44页

作者： Li, Ruiqi Chen, Zheng Li, Junqing Zhang, Chunhong Guo, Qing Harbin Engn Univ Coll Mat Sci & Chem Engn Key Lab Superlight Mat & Surface Technol Harbin 150001 Peoples R China Harbin Inst Technol State Key Lab Adv Welding & Joining Harbin 150001 Peoples R China

Polyaniline nanofibers with diameters under 100 nm were successfully synthesized by interfacial polymerization. The effect of synthesis conditions such as [An], [APS], solvent, and reaction temperature on the morphologies of polyaniline nanofibers was carefully investigated via scanning electron microscopy. The further characterization including FT-IR spectroscopy and electrical conductivity are presented. And the mechanism controlling the growth of polyaniline nanofibers was discussed in detail. Interfacial polymerization is shown to be effective to produce bulk quantities of nanofibers. (c) 2013 Elsevier B.V. All rights reserved.

关键词： Polyaniline Nanofiber Interfacial Polymerization Morphology

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Multi-messenger Observations of a Binary Neutron Star Merger

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ASTROPHYSICAL JOURNAL LETTERS 2017年第2期848卷

作者： Abbott, B. P. Abbott, R. Abbott, T. D. Acernese, F. Ackley, K. Adams, C. Adams, T. Addesso, P. Adhikari, R. X. Adya, V. B. Affeldt, C. Afrough, M. Agarwal, B. Agathos, M. Agatsuma, K. Aggarwal, N. Aguiar, O. D. Aiello, L. Ain, A. Ajith, P. Allen, B. Allen, G. Allocca, A. Altin, P. A. Amato, A. Ananyeva, A. Anderson, S. B. Anderson, W. G. Angelova, S. V. Antier, S. Appert, S. Arai, K. Araya, M. C. Areeda, J. S. Arnaud, N. Arun, K. G. Ascenzi, S. Ashton, G. Ast, M. Aston, S. M. Astone, P. Atallah, D. V. Aufmuth, P. Aulbert, C. AultONeal, K. Austin, C. Avila-Alvarez, A. Babak, S. Bacon, P. Bader, M. K. M. Bae, S. Baker, P. T. Baldaccini, F. Ballardin, G. Ballmer, S. W. Banagiri, S. Barayoga, J. C. Barclay, S. E. Barish, B. C. Barker, D. Barkett, K. Barone, F. Barr, B. Barsotti, L. Barsuglia, M. Barta, D. Barthelmy, S. D. Bartlett, J. Bartos, I. Bassiri, R. Basti, A. Batch, J. C. Bawaj, M. Bayley, J. C. Bazzan, M. Becsy, B. Beer, C. Bejger, M. Belahcene, I. Bell, A. S. Berger, B. K. Bergmann, G. Bero, J. J. Berry, C. P. L. Bersanetti, D. Bertolini, A. Betzwieser, J. Bhagwat, S. Bhandare, R. Bilenko, I. A. Billingsley, G. Billman, C. R. Birch, J. Birney, R. Birnholtz, O. Biscans, S. Biscoveanu, S. Bisht, A. Bitossi, M. Biwer, C. Bizouard, M. A. Blackburn, J. K. Blackman, J. Blair, C. D. Blair, D. G. Blair, R. M. Bloemen, S. Bock, O. Bode, N. Boer, M. Bogaert, G. Bohe, A. Bondu, F. Bonilla, E. Bonnand, R. Boom, B. A. Bork, R. Boschi, V. Bose, S. Bossie, K. Bouffanais, Y. Bozzi, A. Bradaschia, C. Brady, P. R. Branchesi, M. Brau, J. E. Briant, T. Brillet, A. Brinkmann, M. Brisson, V. Brockill, P. Broida, J. E. Brooks, A. F. Brown, D. A. Brown, D. D. Brunett, S. Buchanan, C. C. Buikema, A. Bulik, T. Bulten, H. J. Buonanno, A. Buskulic, D. Buy, C. Byer, R. L. Cabero, M. Cadonati, L. Cagnoli, G. Cahillane, C. Bustillo, J. Caldern Callister, T. A. Calloni, E. Camp, J. B. Canepa, M. Canizares, P. Cannon, K. C. Cao, H. Cao, J. Capano, C. D. Capocasa, E. Carbognani, F. Caride, S. Carney, M. F. Diaz, J. Casanueva Casentini, C. C CALTECH LIGO Pasadena CA 91125 USA Louisiana State Univ Baton Rouge LA 70803 USA Univ Salerno I-84084 Salerno Italy Complesso Univ Monte S Angelo04 Ist Nazl Fis Nucl Sez Napoli I-80126 Naples Italy Univ Florida Gainesville FL 32611 USA Monash Univ Sch Phys & Astron OzGrav Clayton Vic 3800 Australia LIGO Livingston Observ Livingston LA 70754 USA Univ Savoie Mont Blanc CNRS IN2P3 Lab Annecy Le Vieux Phys Particules LAPP F-74941 Annecy France Univ Sannio Benevento I-82100 Benevento Italy Ist Nazl Fis Nucl Sez Napoli I-80100 Naples Italy Max Planck Inst Gravitat Phys Albert Einstein Inst D-30167 Hannover Germany Univ Mississippi University MS 38677 USA Univ Illinois NCSA Urbana IL 61801 USA Univ Cambridge Cambridge CB2 1TN England Nikhef Sci Pk NL-1098 XG Amsterdam Netherlands MIT LIGO Cambridge MA 02139 USA Inst Nacl Pesquisas Espaciais Sao Jose Campos BR-12227010 Sao Paulo Brazil GSSI I-67100 Laquila Italy Ist Nazl Fis Nucl Lab Nazl Gran Sasso I-67100 Assergi Italy Inter Univ Ctr Astron & Astrophys Pune 411007 Maharashtra India Tata Inst Fundamental Res Int Ctr Theoret Sci Bengaluru 560089 India Univ Wisconsin Milwaukee Milwaukee WI 53201 USA Leibniz Univ Hannover D-30167 Hannover Germany Univ Pisa I-56127 Pisa Italy Ist Nazl Fis Nucl Sez Pisa I-56127 Pisa Italy Australian Natl Univ OzGrav Canberra ACT 0200 Australia CNRS IN2P3 LMA F-69622 Villeurbanne France Univ Weast Scotland SUPA Paisley PA1 2BE Renfrew Scotland Univ Paris Saclay Univ Paris Sud CNRS IN2P3LAL F-91898 Orsay France Calif State Univ Fullerton Fullerton CA 92831 USA EGO I-56021 Pisa Italy Chennai Math Inst Chennai 603103 Tamil Nadu India Univ Roma Tor Vergata I-00133 Rome Italy Ist Nazl Fis Nucl Sez Roma Tor Vergata I-00133 Rome Italy Univ Hamburg D-22761 Hamburg Germany Ist Nazl Fis Nucl Sez Roma I-00185 Rome Italy Cardiff Univ Cardiff CF24 3AA S Glam Wales Embry Riddle Aeronaut Univ Prescott AZ 86301 USA Max Planck Inst Gravitat Phys Albe

On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the advanced LIGO and advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of similar to 1.7 s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg(2) at a luminosity distance of 40(-8)(+8) Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 M-circle dot. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at similar to 40 Mpc) less than 11 hours after the merger by the One-Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over similar to 10 days. Following early non-detections, X-ray and radio emission were discovered at the transient's position similar to 9 and similar to 16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nu

关键词： gravitational waves stars: neutron

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Predictive Control for Visual Servo Stabilization of Nonholonomic Mobile Robots

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自动化学报 2013年第8期39卷 1238-1245页

作者： CAO Zheng-Cai YIN Long-Jie FU Yi-Li LIU Tian-Long College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Embedded System and Service Computing Ministry of EducationTongji UniversityShanghai 201804China State Key Laboratory of Robotics and Systems Harbin Institute of TechnologyHarbin 150080China

活动机器人获得了的 nonholonomic 的视觉伺服稳定广泛的注意。当前，这个问题的解决方案不管多么不认为可见性限制和致动器是限制，因此设计控制器是困难的在实际申请认识到令人满意的性能。在这份报纸，为一个活动机器人的视觉伺服稳... 详细信息

活动机器人获得了的 nonholonomic 的视觉伺服稳定广泛的注意。当前，这个问题的解决方案不管多么不认为可见性限制和致动器是限制，因此设计控制器是困难的在实际申请认识到令人满意的性能。在这份报纸，为一个活动机器人的视觉伺服稳定的一个预兆的控制器被介绍。第一，利用产生速度的命令的一个运动学的预兆的稳定控制器被介绍。然后，来临以便 asymptotically 做活动机器人的实际速度到需要的，一个动态预兆的控制器被设计。建议预兆的控制器能容易处理限制。最后，几模拟被执行，并且结果说明建议控制计划是有效的解决视觉伺服稳定问题。

关键词：非完整移动机器人稳定化控制器预测控制器视觉伺服生成速度运动预测稳定问题控制方案

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Layer-by-layer assembled porous CdSe films incorporated with plasmonic gold and improved photoelectrochemical behaviors

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ELECTROCHIMICA ACTA 2013年 108卷 680-689页

作者： Liu, Aiping Ren, Qinghua Yuan, Ming Xu, Tao Tan, Manlin Zhao, Tingyu Dong, Wenjun Tang, Weihua Zhejiang Sci Tech Univ Ctr Optoelect Mat & Devices Key Lab Adv Text Mat & Mfg Technol Minist Educ Hangzhou 310018 Zhejiang Peoples R China Zhejiang Univ State Key Lab Silicon Mat Hangzhou 310027 Zhejiang Peoples R China Tsinghua Univ Shenzhen Res Inst Low Carbon Energy & Energy Saving Lab Shenzhen 518057 Peoples R China Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

A simple method for creating three-dimensional porous wurtzite CdSe films incorporated with plasmonic gold by the electrochemical layer-by-layer assembly was proposed. A prominent enhancement in light absorption of CdSe films was attained by the efficient light scattering of gold plasmons as sub-wavelength antennas and concentrators and the near-field coupling of gold plasmons with the neighboring porous CdSe films. The broadband photocurrent enhancement of Au-CdSe composite systems in the visible light range and the local current maximum between 600 and 700 nm suggested the cooperative action of antenna effects and electromagnetic field enhancement resulting from localized surface plasmon excitation of gold. Furthermore, the photoelectrochemical response of porous Au-CdSe composite films was highly tunable with respect to the number of Au-CdSe bilayer. The optimal short-circuit current and open-circuit potential were obtained in a four-layer Au-CdSe system because the thicker absorber layer with less porous structure might limit the electrolyte diffusion into the hybrid electrode and impose a barrier for electron tunneling and transferring. The highly versatile and tunable properties of assembled porous Au-CdSe composite films demonstrated their potential application in energy conversion devices. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Metallic plasmon Porous CdSe film Multilayer strucuture Photoelectrochemical behavior Solar cells

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Ponderomotive effects during contact formation in microwave sintering

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MODELLING AND SIMULATION IN MATERIALS SCIENCE AND engineering 2013年第5期21卷

作者： Olevsky, Eugene A. Maximenko, Andrey L. Grigoryev, Evgeny G. San Diego State Univ Powder Technol Lab San Diego CA 92182 USA Moscow Engn Phys Inst Key Lab Electromagnet Field Assisted Proc Novel M Moscow 115409 Russia

An assessment of the ponderomotive effect contributions to the kinetics of single contact growth during sintering is carried out. A considerable free surface electromigration during microwave sintering in a polarized electromagnetic field is determined at inter-particle interfaces. It is shown that the electromigration flux reaches its maximum near the inter-particle contact edge and it is equivalent to the compressive stress acting on the contact between particles. The compressive stress is proportional to the intensity of the electric field at the inter-particle neck and inversely proportional to the ratio of the grain boundary and surface diffusivities. The electromigration matter transport can substantially accelerate the shrinkage rate during microwave sintering in comparison with conventional sintering.

关键词： electromagnetic fields

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