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| 1 | Variational principles and governing equations in nano-dielectrics with the flexoelectric effect显示文摘The flexoelectric effect is very strong and coupled with large strain gradients for nanoscale dielectrics. At the nanoscale, the electrostatic force cannot be ignored. In this paper, we have established the electric enthalpy variational principle for nanosized dielectrics with the strain gradient and the polarization gradient effect, as well as the effect of the electrostatic force. The complete governing equations, which include the effect of the electrostatic force, are derived from this variational principle, and based on the principle the generalized electrostatic stress is obtained, the generalized electrostatic stress contains the Maxwell stress corresponding to the polarization and strain, and stress related to the polarization gradient and strain gradient. This work provides the basis for the analysis and computations for the electromechanical problems in nanosized dielectric materials. | HU ShuLing & SHEN ShengPing* MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，8： | 11 |
| 2 | Four COVID-19 Cases of New Variant B.1.351 First Emerging in South Africa in Chinese Passengers on Same Flight-Shenzhen,China,January 2021显示文摘At 04∶50 on January 1,2021,a 36-year-old Chinese project manager(Case A),a 29-year-old Chinese worker(Case B),and a 53-year-old Chinese businessman(Case C)returned from Africa(Case A and B from South Africa and Case C from Lesotho)on the same flight and tested coronavirus disease 2019(COVID-19)RNA positive by real-time polymerase chain reaction(PCR)by Baoan District People’s Hospital.Shenzhen CDC received their oral nasopharyngeal swabs packages from the hospital and retested COVID-19 RNA positive at 09∶50.Meanwhile,Case D. | Cong Cheng Lei Wang Ziquan Lyu Bo Peng Yinghui Li Dongfeng Kong Le Zuo Xiaomin Zhang Chao Yang Weiwen Liu Jia Wan Yijun Tang Junjia He Ying Wen Shule Xu Weihua Wu Ying Chen Guangnan Liu Junjie Xia Xuan Zou Renli Zhang Qinghua Hu Shujiang Mei Tiejian Feng | 2021 | China CDC weekly2021，3，8： | 2 |
| 3 | Tunable high-peak-power, high-energy hybrid Q-switched double-clad fiber laser 显示文摘 | Fan Yaxian Lu Fuyun Hu Shuling | 2004 | Opt Lett2004，29，7： | 1 |
| 4 | Preparation and properties of nanosize silicone resin显示文摘 | Gong Shuling Mei Gongxiong Meng Lingzhi Hu Ling Zhang Xianliang Zhang Qunchao Chen Shenyun Liao Jun | 2002 | Youiigui Cailiao2002，16，5： | 1 |
| 5 | Output characteristics of high power double-clad fiber laser显示文摘 | LU Fuyun Fan Yaxian Hu Shuling | | 0，，： | 1 |
| 6 | Ultrafiat widely tuned single bandpass filter based on stimulated Brillouin scattering显示文摘 | Hu Shuling Li Liwei Yi Xiaoke | 2014 | IEEE Photonics Technology Letters2014，26，14： | 1 |
| 7 | Aerodynamic optimization of an adaptive flap for next-generation green aircraft显示文摘Adaptive,morphing flaps are taking ever-increasing attention in civil aviation thanks to the expected benefits this technology can bring at the aircraft level in terms of high-lift performance improvement and related fuel burnt reduction per flight.Relying upon morphing capabilities,it is possible to fix a unique setting for the flap and adapt the flap shape to match the aerodynamic requirements for take-off or landing.The proper morphed shapes can assure better high-lift performances than those achievable by referring to a conventional flap.Moreover,standing the unique flap setting for take-off and landing,a dramatic simplification of the flap deployment systems may be achieved.As a consequence of this simplification,the deployment system can be fully hosted in the wing,thus avoiding under-wing nacelles with significantly better aerodynamics and fuel consumption.The first step for a rational design of an adaptive flap consists in defining the target morphed shapes and the unique optimal flap setting in the take-off and landing phases.In this work,aerodynamic optimization analyses are carried out to determine the best flap setting and related morphed shapes in compliance with the take-off and landing requirements of a reference civil transport aircraft.Four different initial conditions are adopted to avoid the optimization falling into local optima,thus obtaining four groups of optimal candidate configurations.After comparing each candidate’s performance through 2D and 3D simulations,the optimal configuration has been selected.2D simulations show that the optimal configuration is characterized by a maximum lift increase of 31.92%in take-off and 9.04%in landing.According to 3D simulations,the rise in maximum lift equals 22.26%in take-off and 3.50%in landing.Numerical results are finally verified through wind tunnel tests,and the aerodynamic mechanism behind the obtained improvements is explained by carefully analyzing the flow field around the flap. | Tianlong LIN Rosario PECORA Danilo CILIBERTI Wei XIA Shuling HU | 2024 | Chinese Journal of Aeronautics2024，37，2： | 0 |
| 8 | High-performance violet phosphorus photodetectors with van der Waals-assisted contacts显示文摘Black phosphorus(BP) as a narrow-bandgap two-dimensional semiconductor material has been extensively studied. And the allotrope violet phosphorus(VP) exhibits wide bandgap properties extending the application in the visible light band. However,due to the Schottky barrier of metal/semiconductor contacts(M/S), further device application of VP is limited. Here, VP-based photodetectors with van der Waals-assisted contact were demonstrated, achieving quasi-Ohmic M/S contacts. The output characteristics in dark conditions show ultralow current at the pA level. And the device exhibits a high current on-off ratio of 10~5and a fast response speed of 8.4 ms. Furthermore, we constructed the first allotropic photodetector based on BP and VP heterojunction. The device maintains ultralow dark current(~ pA) while exhibiting faster carrier transport, with 945 μs response time and polarization detection capability. These results offer an effective way to study the optoelectronic properties of VP and promote the study of allotropic heterojunction devices. | Hao Wang Shuling Liu Peng Wang Haonan Ge Yue Chen Hailu Wang Tengfei Xu Jiaxiang Guo Yuanchen Zou Wenrui Wei Ruiqi Jiang Fang Wang Piotr Martyniuk Jinshui Miao Weida Hu | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，9： | 0 |
| 9 | Stabilizing mechanism of single-atom catalysts on a defective carbon surface显示文摘Single-atom(SA)catalysts represent the ultimate limit of atom use efficiency for catalysis.Promising experimental progress in synthesizing SA catalysts aside,the atomic-scale transformation mechanism from metal nanoparticles(NPs)to metal SAs and the stabilization mechanism of SA catalysts at high temperature remain elusive.Through systematic molecular dynamics simulations,for the first time,we reveal the atomic-scale mechanisms associated with the transformation of a metal NP into an array of stable SAs on a defective carbon surface at a high temperature,using Au as a model material.Simulations reveal the pivotal role of defects in the carbon surface in trapping and stabilizing the Au-SAs at high temperatures,which well explain previous experimental observations.Furthermore,reactive simulations demonstrate that the thermally stable Au-SAs exhibit much better catalyst activity than Au-NPs for the methane oxidation at high temperatures,in which the substantially reduced energy barriers for oxidation reaction steps are the key.Findings in this study offer mechanistic and quantitative guidance for material selection and optimal synthesis conditions to stabilize metal SA catalysts at high temperatures. | Lianping Wu Shuling Hu Wenshan Yu Shengping Shen Teng Li | 2020 | npj Computational Materials2020，，1： | 0 |
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