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| 1 | X-ray scintillation in lead-free double perovskite crystals显示文摘Metal halide perovskites have shown great performance for various applications,including solar cells,light emitting diodes,and radiation detectors,but they still suffer from the toxicity of lead and instability.Here we report the use of lanthanide series as trivalent metals to obtain low toxicity and highly stable double perovskites(Cs_2NaLnCl_6,Ln=Tb or Eu)with high scintillation light yield.The crystals exhibit typical f-f transitions of lanthanide cations,while Cs_2NaTbCl_6exhibits strong green photoluminescence,and Cs_2NaEuCl_6exhibits red photoluminescence.Under X-ray radiations,the light yield of Cs_2NaTbCl_6reaches46600 photons MeV^(-1),much higher than that of the commercially used(Lu,Y)_2SiO_5:Ce^(3+)crystals(LYSO,28500 photons MeV^(-1)),and previously reported lead-based perovskites(14000 photons MeV^(-1)).As a new member of lead-free perovskites,lanthanide-based double perovskites open up a new route toward radiation detections and potential medical imaging. | Qingsong Hu Zhenzhou Deng Manchen Hu Anjiang Zhao Yaqi Zhang Zhifang Tan Guangda Niu Haodi Wu Jiang Tang | 2018 | Science China Chemistry2018，61，12： | 7 |
| 2 | Experimental study of a micro-scale solar organic Rankine cycle system based on compound cylindrical Fresnel lens solar concentrator显示文摘In the present study, a micro-scale solar organic Rankine cycle power generation system was developed. The system comprises of a solar collection system based on compound cylindrical Fresnel lens concentrator and an organic Rankine cycle power generation system integrated with a scroll expander. YD320 and R245 fa were used as the heat transfer fluid and the working fluid, respectively. The effects of the evaporation pressure, the degree of superheat, and the mass flow rate of the working fluid were analyzed to evaluate the solar collection efficiency, the electric power output, the thermal efficiency and exergy efficiency of the system. The results illustrate that both the increasing evaporation pressure and decreasing superheat degree have positive impacts on solar collection efficiency. The electric power increases as the evaporation pressure increases, while the thermal efficiency and the exergy efficiency decrease. However, the system overall efficiency decreases slowly due to the increase of solar collection efficiency. The electric power increases with the increment of the working fluid mass flow rate. The increasing mass flow rate has no visible impact on the thermal and exergy efficiencies of organic Rankine cycle subsystem, whereas a slightly increase of the thermal and exergy efficiencies of the integrated system. The electric power decreases with the increase of the superheat degree, whereas the thermal and the exergy efficiencies of the system increase. The system works more suitably with a higher degree of superheat for the small mass flow rate condition. | MENG Jia SONG PanPan WEI MingShan TIAN GuoHong ZHAO Meng ZHENG HongFei HU GuangDa | 2019 | Science China(Technological Sciences)2019，62，12： | 3 |
| 3 | Antimony doped Cs2SnCl6 with bright and stable emission显示文摘Lead halide perovskites,with high photoluminescence efficiency and narrow・band emission,are promising materials for display and lighting.However,the lead toxicity and environmental sensitivity hinder their potential applications.Herein,a new antimony・doped lead-free inorganic perovskites variant Cs2SnCl6:xSb is designed and synthesized.The perovskite variant Cs2SnCl6:xSb exhibits a broadband orange-red emission,with a photoluminescence quantum yield(PLQY)of 37%.The photoluminescence of Cs2SnCl6:xSb is caused by the ionoluminescence of Sb3+within Cs2SnCl6 matrix,which is verified by temperature dependent photoluminescence(PL)and PL decay measurements.In addition,the all inorganic structure renders Cs2SnCl6:xSb with excellent thermal and water stability.Finally,a white light-emitting diode(white-LED)is fabricated by assembling Cs2SnCl6:0.59%Sb,Cs2SnCl6:2.75%Bi and Ba2Sr2SiO4:Eu2+onto the commercial UV LED chips,and the color rendering index(CRI)reaches 81. | Jinghui LI Zhifang TAN Manchen HU Chao CHEN Jiajun LUO Shunran LI Liang GAO Zewen XIAO Guangda NIU Jiang TANG | 2019 | Frontiers of Optoelectronics2019，12，4： | 2 |
| 4 | Noise expresses exponential growth under regime switching显示文摘 | HU Guangda LIU Mingzhu MAO Xuerong | 2009 | Systems & Control Letters2009，58，9： | 1 |
| 5 | Noise suppresses exponential growth under regime switching 显示文摘 | HU Guangda LIU Mingzhu MAO Xuerong | 2009 | Jour- nal of Mathematical Analysis and Applications2009，355，2： | 1 |
| 6 | Observers for one-sided Lipschitz non-linear systems显示文摘 | Hu Guangda | 2006 | IMA Journal of Mathematical Control and Information2006，23，： | 1 |
| 7 | A note on observer for one-sided Lipschitz non-linear systems显示文摘 | Hu Guangda | 2008 | IMA Journal of Mathematical Control and Information2008，25，： | 1 |
| 8 | Global exponential periodicity and stability of cellular neural networks with variable and distributed delays显示文摘 | Liqun Zhou Guangda Hu | 2007 | Applied Mathematics and Computation2007，，2： | 1 |
| 9 | Noise suppresses exponential growth under regime switching显示文摘 | HU Guangda LIU Mingzhu MAO Xuerong SONG Minghui | 2009 | Journal of Mathematical Analysis and Applications2009，355，： | 1 |
| 10 | Epitaxy of vertical ZnO nanorod arrays on highly (001)-oriented ZnO seed monolayer by a hydrothermal route显示文摘 | WU Weibing HU Guangda CUI Shougang | 2008 | Cryst Growth Des2008，8，11： | 1 |
| 11 | Global exponential periodicity and stability of cellular neural networks with variable and distributed delays显示文摘 | LIQUN ZHOU GUANGDA HU | 2008 | Applied Mathematics and Computation2008，195，： | 1 |
| 12 | 显示文摘 | Zhong Yu Hu Guangda | 2003 | Jpn J Appl Phys2003，42，： | 1 |
| 13 | Delay-dependent stability of linear multistep methods for differential systems with distributed delays显示文摘This paper deals with the stability of linear multistep methods for multidimensional differential systems with distributed delays. The delay-dependent stability of linear multistep methods with compound quadrature rules is studied. Several new sufficient criteria of delay-dependent stability are obtained by means of the argument principle. An algorithm is provided to check delay-dependent stability. An example that illustrates the effectiveness of the derived theoretical results is given. | Yanpei WANG Yuhao CONG Guangda HU | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，12： | 1 |
| 14 | Delay-dependent robust stabilization for a class ofneutral systems with nonlinear perturbations显示文摘This note deals with the problem of stabilization/stability for neutral systems with nonlinear perturba- tions.A new stabilization/stability scheme is presented.Using improved Lyapunov functionals,less conservative stabiliza- tion/stability conditions are derived for such systems based on linear matrix inequalities(LMI).Numerical examples are provided to show that the proposed results significantly improve the allowed upper bounds of the delay size over some existing ones in the literature. | Ming LI Guangda HU | 2007 | 控制理论与应用(英文版)2007，5，4： | 1 |
| 15 | Stability of linear neutral systems with multiple delays: Boundary criteria 显示文摘 | Hu GuangDa Hu GuangDi Zou Xingfu | 2004 | Applied Mathematics and Computation2004，148，3： | 1 |
| 16 | Stability criteria of linear neutral systems with multiple delays显示文摘 | Hu GuangDa Liu Mingzhu | 2007 | IEEE Trans on Automatic Control2007，52，4： | 1 |
| 17 | Observers for one-sised Lipschitz non-linear systems显示文摘 | Hu Guangda | 2006 | IMA Journal of Mathematical Control and Information2006，23，4： | 1 |
| 18 | A note on Observer for one-sised Lipschitz non-linear systems显示文摘 | Hu Guangda | 2007 | IMA Journal of Mathematical Control and Information2007，25，4： | 1 |
| 19 | Inorganic antimony halide hybrids with broad yellow emissions显示文摘Lead halide perovskites exhibit unexceptionable photoelectric properties.However,these materials are unsatisfactory in terms of stability and toxicity.Herein,we report Rb7 Sb3 Cl16 as a new kind of lead free perovskite variants.This material can be easily obtained through hydrothermal reactions.The composition is determined through structure refinement,elemental analysis and X-ray photoelectron spectra.Rb7 Sb3 Cl16 exhibits a broad yellow emission at 560 nm,with a Stokes shift of 175 nm and a photoluminescence quantum yield(PLQY)around 26%.Rb7 Sb3 Cl16 also shows good thermal and water stability due to its inorganic composition.White light-emitting diodes(LEDs)are constructed by combining Rb7 Sb3 Cl16 as yellow phosphors,our previously reported Cs2 SnCl6:2.75%Bi as blue phosphors,and commercial UV LED chips as the excitation source,producing a white light with the Commission Internationale de’Eclairage(CIE)color coordinates at(0.39,0.38). | Zhifang Tan Manchen Hu Guangda Niu Qingsong Hu Jinghui Li Meiying Leng Liang Gao Jiang Tang | 2019 | Science Bulletin2019，64，13： | 0 |
| 20 | Almost sure exponential stability of neutral stochastic delayed cellular neural networks显示文摘In this paper, almost sure exponential stability of neutral delayed cellular neural networks which are in the noised environment is studied by decomposing the state space to sub-regions in view of the saturation linearity of output functions of neurons of the cellular neural networks. Some algebraic criteria are obtained and easily verified. Some examples are given to illustrate the correctness of the results obtained. | Liqun ZHOU Guangda HU | 2008 | 控制理论与应用(英文版)2008，6，2： | 0 |
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