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Coexistence of All-Order Topological States in a Three-Dimensional Phononic Topological Crystalline Insulator

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Research 2024年第2期2023卷 511-518页

作者： Hua-Shan Lai hao Chen chu-hao Xia Si-Yuan Yu Cheng He Yan-Feng Chen National Laboratory of Solid State Microstructures&Department of Materials Science and Engineering Nanjing UniversityNanjng 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjng 210093China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing 210093China

Classical-wave topological materials lacking intrinsic half-integer spins are less robust while more ***,we explore a single 3-dimensional phononic topological crystalline insulator that simultaneously exhibits a whole family of first-order quadratic surface,second-order hinge,and third-order corner states within the same *** a topological crystalline insulator hosting all-order phases originates from the different topological nature when hierarchically projected onto different facets and lower dimensions,thus free from trivial cladding *** work offers an ideal platform for either robust wave propagation or localization in on-demand dimensions and may facilitate dimension division multiplexing technology.

关键词： topological dimensions crystalline

An atomic insight into effect of grain boundary on diffusion behavior of Cu/Al dissimilar materials undergoing ultrasonic welding

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Journal of Iron and Steel Research International 2024年第10期31卷 2555-2567页

作者： Jing-wei Yang chu-hao Xie Jie Zhang Zong-ye Ding Jian Qiao School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225GuangdongChina School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Advanced Brazing Filler Metals&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina

The diffusion processes in bicrystalline Cu/Al joints,characterized by typical high-angle grain boundaries(GBs),were investigated using molecular dynamics *** was found that GBs facilitated the diffusion of both Cu and Al atoms,predominantly enhancing the migration of Cu atoms into Al *** to mean squared displacement results,the movement of Al atoms within Al matrix was more vigorous than that of Cu *** mechanisms of atomic rearrangement,dislocation movement,stacking fault formation,and dynamic recrystallization were *** the compression and initial welding stages,the mismatch in lattice constants and the twisting of grains initiated a squeeze-induced rearrangement of Al atoms at the interface,leading to the formation of dislocations and *** the advanced stages of welding,the plastic deformation primarily occurred within Al matrix,marked by the emergence of dislocations,stacking faults,and GB ***,the shearing effect during the ultrasonic welding process,combined with GB sliding,collectively induced grain recrystallization at the ***,the diffusion between Cu/Al joints could be enhanced by increasing the vibration frequency,due to a significant rise in the number of amorphous regions.

关键词： Grain boundary Molecular dynamics Diffusion behavior Ultrasonic welding Dissimilar material

A Resource Elastic Scheduling Algorithm of Service Platform for Cloud Robotics 32

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A Resource Elastic Scheduling Algorithm of Service Platform ...

A FEM-DFN model for the interaction and propagation of multi-cluster fractures during variable fluid-viscosity injection in layered shale oil reservoir

第32届中国控制与决策会议

作者： Ji Peng chu hao Chi Jianning Jiang Jingqi Faculty of Robot Science and Engineering Northeastern University

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158556;9781728158563

Cloud computing can offer the robots high performance computing resources,and the big data stored on cloud platform can enhance significantly autonomy and collaborative capacity of ***,a platform as a service level cloud platform is essential,which should provide the ability of reusing the achievements of robotics and support that multi robots can access the cloud services on *** ensure that the robots functional services can have a better performance of computing in high or low loads,and improve the resource utilization efficiency of service platform,there is a flexible container capacity scheduling algorithm in the resource management *** the actual operation situation of different robotic services,this algorithm calculates the average load according to the CPU usage,memory usage and network usage of containers,and performs capacity elastic scheduling operation by preset upper and lower *** the period of resource flexibility expansion,users will not perceive the dynamic scheduling of functional service capacity,which ensures the stability of the platform.

关键词： Cloud robotics Docker container technology Service Platform Resource elastic scheduling Load balancing

来源： cnki会议评论

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Petroleum Science 2022年第6期19卷 2796-2809页

作者： chu-hao Huang Hai-Yan Zhu Jian-Dong Wang Jian Han Guang-Qing Zhou Xuan-He Tang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanPR China Petroleum Engineering Technology Research Institute Shengli Oilfield CompanySINIOPECDongying257000ShandongPR China Chongqing Gas Field Southwest Oil and Gas Field CompanyPetro ChinaChongqing400021PR China

To investigate the height growth of multi-cluster fractures during variable fluid-viscosity fracturing in a layered shale oil reservoir,a two-dimensional finite element method(FEM)-discrete fracture network(DFN)model coupled with flow,stress and damage is proposed.A traction-separation law is used to describe the mixed-mode response of the damaged adhesive fractures,and the cubic law is used to describe the fluid flow within the *** rock deformation is controlled by the in-situ stress,fracture cohesion and fluid pressure on the hydraulic fracture *** coupled finite element equations are solved by the explicit time difference *** effects of the fracturing treatment parameters including fluid viscosity,pumping rate and cluster spacing on the geometries of multifractures are *** results show that variable fluid-viscosity injection can improve the complexity of the fracture network and height of the main fractures *** pumping rate of15 m^(3)/min,variable fluid-viscosity of 3-9-21-36-45 mPa s with a cluster spacing of 7.5 m is the ideal treatment *** field application shows that the peak daily production of the application well with the optimized injection procedu re of variable fluid-viscosity fracturing is 171 tons(about 2.85 times that of the adjacent well),which is the highest daily production record of a single shale oil well in China,marking a strategic breakthrough of commercial shale oil production in the Jiyang Depression,Shengli *** variable fluid-viscosity fracturing technique is proved to be very effective for improving shale oil production.

关键词： Shale oil reservoir FEM-DFN model Fracture propagation Variable fluid-viscosity injection Bedding planes

Investigation of Absorption of Nanocrystalline Silicon

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Chinese Physics Letters 1999年第11期16卷 833-835页

作者： MA Zhi-xun LIAO Xian-bo KONG Guang-lin chu Jun-hao State Key Laboratory for Surface Physics Institute of SemiconductorsCenter for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100083 National Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083

Nanocrystalline silicon embedded SiO2 matrix is formed by annealing the SiOx films fabricated by plasma enhanced chemical vapor deposition technique. In conjunction with the micro-Raman spectra, the absorption spectra of the films have been investigated. The blue-shift of absorption edge with decreasing size of silicon crystallites is due to quantum confinement effect. It is found that nanocrystalline silicon is of an indirect band structure, and that the absorption presents an exponential dependence of absorption coefficient on photon energy in the range of 2.0-3.0eV, and a sub-band appears in the range of 1.0-1.5eV. We believe that the exponential absorption is due to the indirect band-to-band transition of electrons in silicon nanocrystallites, while the sub-band absorption is ascribed to transitions between the amorphous silicon states existing in the films.

关键词： technique. absorption exponential

Molecular engineering and biomedical applications of ultra-sensitive fluorescent probe for Ag^(+)

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Chinese Chemical Letters 2021年第10期32卷 3066-3070页

作者： Jianfei Kan Xiaonan Zhou Yanyan Sun Liyuan Sun hao chu Zhaosheng Qian Jin Zhou School of Pharmacy Maternal and Child Health Hospital of Weifang Medical UniversityWeifang Medical UniversityWeifang 261053China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua 321004China

A series of probes KJ-x(x=1-3)with carbon chains of different lengths based on the matrix of rhodamine B were engineered to detect Ag^(+)in aqueous solution in this *** them,KJ-1 is selected as the best option after in vitro investigation in view of its most sensitive and rapid response to Ag^(+),whose possible sensing mechanism is studied by experimental investigation and theoretical *** identify the practical application of the probe,the detection of Ag^(+)in nonantibiotic fungicide Silver&Health and differentiation between normal hepatocytes and hepatoma cells using confocal imaging was conducted.

关键词： Fluorescent probe Ag^(+) Detection Imaging Theoretical calculation Cell typing Spirolactam

An Improved Room-Temperature Silicon Terahertz Photodetector on Sapphire Substrates

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Chinese Physics Letters 2019年第9期36卷 87-90页

作者： Xue-Hui Lu Cheng-Bin Jing Lian-Wei Wang Jun-hao chu Key Laboratory of Polar Materials and Devices(Ministry of Ed ucation) Institute of Functional MaterialsDepartment of MaterialsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241 Shanghai Institute of Jn elligen'Electronics&SystemsFudan UniversityShanghai 200433 State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083

We design and fabricate a good performance silicon photoconductive terahertz detector on sapphire substrates at room *** best voltage responsivity of the detector is 6679 V/W at frequency 300 GHz as well as low voltage noise of 3.8 nV/Hz1/2 for noise equivalent power 0.57 pW/Hz1/*** measured response time of the device is about 9μs,demonstrating that the detector has a speed of>110 *** achieved good performance,together with large detector size(acceptance area is 3μm×160μm),simple structure,easy manufacturing method,compatibility with mature silicon technology,and suitability for large-scale fabrication of imaging arrays provide a promising approach to the development of sensitive terahertz room-temperature detectors.

关键词： Sapphire

S incorporated RuO_(2)-based nanorings for active and stable water oxidation in acid

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Nano Research 2022年第5期15卷 3964-3970页

作者： Qing Yao Zhiyong Yu Ying-hao chu Yu-Hong Lai Ting-Shan Chan Yong Xu Qi Shao Xiaoqing Huang College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Materials Science and Engineering "National Yang Ming Chiao Tung University"Hsinchu 30010TaiwanChina "National Synchrotron Radiation Research Center" 101 Hsin-Ann RoadHsinchu 30076TaiwanChina Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China

The design of highly active and stable RuO_(2)-based nanostructures for acidic oxygen evolution reaction(OER)is extremely important for the development of water electrolysis technology,yet remains great *** here demonstrate that the incorporation of S into RuCuO nanorings(NRs)can significantly enhance the acidic OER *** investigations show that the incorporation of S can optimize the interaction of Ru and O,and therefore significantly suppresses the dissolution of Ru in acidic *** optimized catalyst(SH-RuCuO NRs)displays superior OER performance to the commercial RuO_(2)/***,the SH-RuCuO NRs can exhibit significantly enhanced stability for 3,000 cycles of cyclic voltammetry test and more than 250 h chronopotentiometry test at 10 mA·cm^(-2)in 0.5 M H_(2)SO_(4).This work highlights a potential strategy for designing active and stable RuO_(2)-based electrocatalysts for acidic OER.

关键词： S incorporation RuCu nanoring stable acidic oxygen evolution reaction

Estimating daily actual evapotranspiration of a rice–wheat rotation system in typical farmland in the Huai River Basin using a two-step model and two one-step models

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Journal of Integrative Agriculture 2021年第1期20卷 274-288页

作者： LI Meng chu Rong-hao Abu Reza Md.Towfiqul ISLAM JIANG Yue-lin SHEN Shuang-he School of Resources and Environment Anhui Agricultural UniversityHefei 230036P.R.China Hefei Scientific Observing and Experimental Station of Agro-Environment Ministry of Agriculture and Rural AffairsP.R.China Anhui Public Meteorological Service Center Anhui Meteorological BureauHefei 230031P.R.China Department of Disaster Management Begum Rokeya UniversityRangpur 5400Bangladesh Key Laboratory of Meteorological Disaster Ministry of Education(KLME)ZJoint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CICFEMD)/Jiangsu Key Laboratory of Agricultural MeteorologyCollege of Applied MeteorologyNanjing University of Information Science&TechnologyNanjing 210044P.R.China

The objective of this study is to evaluate the performance of three models for estimating daily evapotranspiration(ET) by employing flux observation data from three years(2007, 2008 and 2009) during the growing seasons of winter wheat and rice crops cultivated in a farmland ecosystem(Shouxian County) located in the Huai River Basin(HRB), China. The first model is a two-step model(PM-Kc);the other two are one-step models(e.g., Rana-Katerji(R-K) and advection-aridity(AA)). The results showed that the energy closure degrees of eddy covariance(EC) data during winter wheat and rice-growing seasons were reasonable in the HRB, with values ranging from 0.84 to 0.91 and R2 of approximately 0.80. Daily ET of winter wheat showed a slow decreasing trend followed by a rapid increase, while that of rice presented a decreasing trend after an increase. After calibrating the crop coefficient(Kc), the PM–Kc model performed better than the model using the Kc recommended by the Food and Agricultural Organization(FAO). The calibrated key parameters of the R-K model and AA model showed better universality. After calibration, the simulation performance of the PM-Kc model was satisfactory. Both the R-K model and AA model underestimated the daily ET of winter wheat and rice. Compared with that of the R-K model, the simulation result of the AA model was better, especially in the simulation of daily ET of rice. Overall, this research highlighted the consistency of the PM-Kc model to estimate the water demand for rice and wheat crops in the HRB and in similar climatic regions in the world.

关键词： daily evapotranspiration crop coefficient crop water demand rice–wheat rotation system Huai River Basin