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Growth modulation of simultaneous epitaxy of ZnO obliquely aligned nanowire arrays and film on r-plane sapphire substrate

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Nano Research 2018年第7期11卷 3864-3876页

作者： yongchun xiao Yaoyao Tian Shujing sun Chenlong Chen Buguo Wang Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China College of Materials Science and Engineering Fujian Normal University Fuzhou 350007 China wSemiconductor Research Center Wright State University Dayton OH45431 USA

Simultaneous epitaxial growth of film and nanowire array on a substrate is of both scientific significance and practical importance for nanoscale optoelectronics. Nevertheless, in situ building conducting connection between individually isolated nanowires grown on insulating substrates is still challenging. Herein, we demonstrate a novel and facile strategy for the simultaneous epitaxial growth of nonpolar a-plane ZnO film and obliquely aligned nanowire array on Au-coated r-plane sapphire substrate. The morphology, structure, components, and optical properties of the as-synthesized ZnO nanostructures were investigated using field-emission scanning electron microscopy X-ray diffraction, field-emission transmission electron microscopy energy-dispersive spectroscopy, X-ray photo- electron spectroscopy, and photoluminescence spectroscopy. A cooperative growth mechanism is proposed： Au-catalyzed vapor transport initiates the co-occurrence of nonpolar a-plane and polar c-plane ZnO nuclei, and subsequently, the non-upward directed Au catalyst helps the nonpolar a-plane ZnO nuclei develop into a ZnO conductive film at the bottom and zinc self-catalyzed vapor-liquid-solid growth helps the polar c-plane ZnO nuclei develop simultaneously into obliquely aligned nanowire arrays. The proposed strategy realized in situ synthesis of nanowires with conductive connection and it can benefit the application of ZnO nanowires in optoelectronics.

关键词： ZnO obliquely aligned nanowire arrays non-polar thin film epitaxy zinc self-catalyzed

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Facile Route to Control over the Morphological Evolution of beta-Ga_2O_3 from Nanowires to Nanoflags and to Nanosheets

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结构化学 2019年第1期

作者： Tian Yaoyao xiao yongchun Sun Shujing Li Kang Li Pengkun Chen Chenlong

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解淀粉芽孢杆菌高密度发酵条件的优化

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中国测试 2017年第5期43卷 49-52页

作者：王涛刘健左建英张俊侯永春龚骁孙群四川大学生命科学学院四川成都610064 四川龙蟒福生科技有限责任公司四川眉山620036

该文探讨解淀粉芽孢杆菌(***)1841的高密度工业发酵工艺优化,为解淀粉芽孢杆菌的工业化生产提供依据。以平板菌落直径、及培养后的活菌浓度为指标,对种子的保存方法、活化方式和培养基、发酵培养基中的酵母粉和大豆蛋白粉用量以及发酵... 详细信息

该文探讨解淀粉芽孢杆菌(***)1841的高密度工业发酵工艺优化,为解淀粉芽孢杆菌的工业化生产提供依据。以平板菌落直径、及培养后的活菌浓度为指标,对种子的保存方法、活化方式和培养基、发酵培养基中的酵母粉和大豆蛋白粉用量以及发酵的后期调控进行筛选和优化。筛选出最佳的工业菌种保存条件为30%甘油为保护剂,-64℃保存;最佳活化方法为采用PDA培养基活化,并经过一次48 h活化和24 h二次活化;最佳的转菌时间为在种子培养后17~18 h。最佳的酵母粉和大豆蛋白粉浓度分别为20 g/L和40 g/L,发酵的后期调控需要进行补料和流加氨水将p H控制在7.0±0.2,发酵时间延长至72 h。通过对发酵的基本条件进行筛选和优化,得到可在100 L发酵罐上进行高密度发酵的体系,发酵浓度可达常规发酵的100倍(>1×1014CFU/m L)。

关键词：解淀粉芽孢杆菌保存活化高密度发酵

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塔里木盆地克拉2大气田天然气的成因探讨

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天然气工业 2004年第11期24卷 8-10页

作者：李贤庆肖贤明米敬奎刘德汉申家贵唐永春肖中尧中国科学院广州地球化学研究所有机地球化学国家重点实验室美国加州理工学院石油能源与环境研究中心中国石油塔里木油田分公司勘探开发研究院

文章研究了塔里木盆地库车坳陷侏罗系煤系烃源岩在封闭体系下热模拟生成甲烷的碳同位素特征及其动力学参数,探讨了克拉2大气田天然气的成因。碳同位素动力学研究表明,库车坳陷侏罗系煤系烃源岩热模拟生成甲烷的碳同位素值介于-37‰^-25... 详细信息

文章研究了塔里木盆地库车坳陷侏罗系煤系烃源岩在封闭体系下热模拟生成甲烷的碳同位素特征及其动力学参数,探讨了克拉2大气田天然气的成因。碳同位素动力学研究表明,库车坳陷侏罗系煤系烃源岩热模拟生成甲烷的碳同位素值介于-37‰^-25‰之间;可以用动力学方法将煤系烃源岩热模拟实验数据外推,应用于地质条件。克拉2大气田天然气主要来源于中下侏罗统煤系烃源岩,属阶段捕获气,主要聚集了-5^-1 Ma阶段的天然气,其成熟度R(?)为1.3％-2.5％。这不仅得到早期相关研究成果的支持,而且也符合该区天然气的勘探实际。

关键词：煤系烃源岩大气田成因探讨碳同位素塔里木盆地侏罗系下侏罗统天然气库车坳陷热模拟实验

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Tunable optical second-order sideband effects in a parity-time symmetric optomechanical system

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 51-58页

作者： Xing xiao QingHong Liao NanRun Zhou WenJie Nie yongchun Liu Department of Electronic Information Engineering Nanchang UniversityNanchang 330031China State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsFrontier Science Center for Quantum InformationTsinghua UniversityBeijing 100084China Department of Applied Physics East China Jiaotong UniversityNanchang 330013China

We theoretically investigate the optical second-order sideband generation(OSSG)in an optical parity-time(PT)symmetric system,which consists of a passive cavity trapping the atomic ensemble and an active *** with the double-passive system,it is found that near the exceptional point(EP),the efficiency of the OSSG increases sharply not only for the blue probepump detuning resonant case but also for the red *** experimentally achievable parameters,we study the effect of the atomic ensemble on the efficiency of the OSSG in the PT-symmetric *** numerical results show that the efficiency of the OSSG is 30%higher than that of the first-order sideband,which is realized easily by simultaneously modulating the atom-cavity coupling strength and ***,the efficiency of the OSSG can also be tuned effectively by the pump power,and the efficiency is robust when the pump power is strong *** study may have some guidance for modulating the nonlinear optical properties and controlling light propagation,which may stimulate further applications in optical communications.

关键词： second-order sideband effects parity-time symmetry optomechanical system

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Vesicle-shaped ZIF-8 shell shielded in 3D carbon cloth for uniform nucleation and growth towards long-life lithium metal anode

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Journal of Energy Chemistry 2021年第3期30卷 105-110页

作者： Yuting Fang Wenlong Cai Shanshan Zhu Kangli Xu Maogen Zhu Guannan xiao yongchun Zhu Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry University of Science and Technology of ChinaHefei 230026AnhuiChina

Lithium metal has aroused extensive research interests as the anode for next-generation rechargeable ***,the well-known dendritic Li growth and consequent safety issues still impair the long-term cycling ***,a hybrid structure composed of 3 D carbon cloth and vesicleshaped hollow ZIF-8 modification shell(HZS@CC)was prepared as a smart host for guiding uniform Li *** long-range interconnected 3 D carbon fiber network enables the reduced local current density with homogeneous electrons ***,abundant surface polar groups and the ultrastructure on ZIF-8 particles effectively guide a well-distributed Li-ions flow to promote the uniform Li nucleation and *** a result,stable Li plating/stripping for 2000 h with a low overpotential(≈15 mV)at 1 mA cm^(-2) were achieved in symmetric *** with LiFePO_(4) cathode,the full cell delivered long life over 1200 cycles at 6 *** research demonstrated that a homogenization guiding of Li-ions is of great importance to better make use of the structural advantage of 3 D hosts and achieve improved electrochemical performance.

关键词： 3D Li anode MOF ultrastructure Li-ions guiding Uniform deposition Long-life

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A Novel Nonlinear Backstepping-Based Control Approach for Quadrotor Unmanned Aerial Vehicle Transportation Systems 36

A Novel Nonlinear Backstepping-Based Control Approach for Qu...

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第36届中国控制会议

作者： xiao Liang yongchun Fang Ning Sun Institute of Robotics and Automatic Information System Nankai University Tianjin Key Laboratory of Intelligent Robotics Nankai University

ISBN: (纸本)9781538629185

In this paper, a novel control scheme is proposed for quadrotor unmanned aerial vehicle(UAV) transportation *** proposed control law successfully achieves efficient quadrotor transferring and rapid swing elimination ***, by analyzing the interconnected form of the system, the virtual control input for the outer loop is constructed via an energy-based analysis method, so as to compute the applied thrust and the desired roll angle of the quadrotor. As for the inner loop, a backstepping control method is utilized without the introduction of the time-scale separation principle, and the equilibrium point of the overall close-loop system is proven to be asymptotically stable by Lyapunov techniques and La Salle’s invariance theorem. Simulation results demonstrate the proposed control law’s superior performance and good robustness against various uncertainties.

关键词： Quadrotor UAV Transportation Systems Backstepping-Based Control Lyapunov Techniques La Salle’s Invariance Theorem

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The Aerodynamics and Compact Dynamic Model of a Flapping Wing Vehicle 36

The Aerodynamics and Compact Dynamic Model of a Flapping Win...

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第36届中国控制会议

作者： Chen Qian yongchun Fang xiao Liang Institute of Robotics and Automatic Information System Nankai University Tianjin Key Laboratory of Intelligent Robotics Nankai University

ISBN: (纸本)9781538629185

In this paper, the dynamics of a flapping wing vehicle are studied. A quasi-steady model is developed to analyze its aerodynamic forces and moments. The unsteady effects are considered both in hovering state and forward flight state. Different from existing flapping wing vehicle dynamics model, the rudder’s dynamics are concurrently considered in the proposed *** simulation is conducted for showing the detail characteristics of the flapping wing vehicle. After rigorous summation and analysis, a simplified dynamic model is constructed by using the averaging theory. The development of the simplified model paved the way for further studies and applications of similar flapping vehicle mechanism, such as perturbation analysis and controller design.

关键词： Flapping wing vehicle Quasi-steady Dynamic modeling

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The generation kinetics of natural gases in the Kela-2 gas field from the Kuqa Depression, Tarim Basin, northwestern China

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Chinese Journal Of Geochemistry 2013年第2期32卷 157-169页

作者： LI Xianqing FENG Songbao xiao Xianming TANG yongchun xiao Zhongyao MI Jingkui TIAN Hui LIU Dehan SHEN Jiagui State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Environmental and Energy Research Center California Institute of Technology 738 Arrow Grand Circle Covina California 91722 USA Power Research Institute of Exploration and Development Tarim Oilfield CompanyPetroChina Research Institute of Petroleum Exploration and Development PetroChina

The Kela-2 gas field, found in the Kuqa Depression of the Tarim Basin, northwestern China, is a large-sized dry gas field (C1 /C1-5 =0.992 0.999) and characterized by ultra-high pressure (pressure factor up to 2.0 2.2). The pyrolysis experiment was carried out under isothermal gold-tube closed system, with samples collected from the Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression. The result of gas yield showed that the Middle and Lower Jurassic source rocks have higher gas generation potential than the Triassic source rocks. The kinetic modeling of gas generation and methane carbon isotope fractionation suggested that the Kela-2 gases belong to the products of high-over mature stages and were mainly derived from the Middle and Lower Jurassic coal-bearing strata. The Triassic source rocks made a minor contribution to the Kela-2 gases. The Kela-2 gases chiefly generated from coal-bearing source rocks with R o values from 1.3% to 2.5%, and thus primarily accumulated after 5 Ma.

关键词：克拉2气田塔里木盆地中国西北部天然气产量动力学建模库车坳陷煤系烃源岩含煤地层

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The generation and accumulation of natural gas from Yinan 2 gas pool in Kuqa Depression

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Chinese Science Bulletin 2004年第S1期49卷 107-114页

作者： LI Xianqing xiao Xianming TANG yongchun xiao Zhongyao Ml Jingkui LIU Dehan SHEN Jiagui LIU Jinzhong The State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Key Laboratory of Coal Resources Ministry of EducationChina University of Mining and TechnologyBeijing 100083China The Research Center of Petroleum Energy and Environment California Engineer and Technology College21910 Currier RdWalnutCA 61769USA Research Institute of Exploration and Development Tarim Oil Field Sub-CompanyPetroChinaKorla 841000China

By using the methods of hydrocarbon generation kinetics and carbon isotope kinetics, combined with geological background of natural gas pool formation, the generation and accumulation of natural gas from Yinan 2 gas pool was studied in Kuqa Depression of the Tarim Basin. Natural gas of Yinan 2 gas pool is mainly derived from Middle and Lower Jurassic coal-bearing source rocks, and generally belongs to long time-accumulated gas. It is suggested that Yinan 2 gas is chiefly accumulated in the last 5 Ma, its Ro ranges from 1.25% to 1.95%, and the loss rate of natural gas is about 25%-30%. This work not only complements and reduces the deficiency of formation model of natural gas pools which traditionally depends on the matching relationships between source rock, reservoir, cap rock, and trap, but also is a useful reference in the study of other gas pools.

关键词： natural gas formation hydrocarbon generation kinetics carbon isotope source rock Yinan 2 gas pool Kuqa Depression.

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