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Two-dimensional silicon nanomaterials for optoelectronics

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Journal of Semiconductors 2023年第4期44卷 15-29页

作者： Xuebiao Deng Huai Chen zhenyu yang MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China

Silicon nanomaterials have been of immense interest in the last few decades due to their remarkable optoelectronic responses,elemental abundance,and higher ***-dimensional silicon is one of the new allotropes of silicon and has many compelling properties such as quantum-confined photoluminescence,high charge carrier mobilities,anisotropic electronic and magnetic response,and non-linear optical *** review summarizes the recent advances in the synthesis of two-dimensional silicon nanomaterials with a range of structures(silicene,silicane,and multilayered silicon),surface ligand engineering,and corresponding optoelectronic applications.

关键词： two-dimensionality silicon nanomaterials synthesis surface engineering optoelectronics

Adsorption characteristics of ciprofloxacin onto g-MoS2 coated biochar nanocomposites

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Frontiers of Environmental Science & Engineering 2020年第3期14卷 49-58页

作者： zhenyu yang Rong Xing Wenjun Zhou Lizhong Zhu Department of Environmental Science Zhejiang UniversityHangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058China

The g-MoS2 coated biochar(g-MoS2-BC)composites were synthesized by coating original biochar with g-MoS2 nanosheets at 300℃(BC300)/700℃(BC700).The adsorption properties of the g-MoS2-BC composites for ciprofloxacin(CIP)were investigated with an aim to exploit its high efficiency toward soil *** specific surface area and the pore structures of biochar coated g-MoS2 nanosheets were significantly *** g-MoS2-BC composites provided more n electrons,which was favorable in enhancing the n-n electron donor-acceptor(EDA)interactions between CIP and *** a result,the g-MoS2-BC composites showed faster adsorption rate and greater adsorption capacity for CIP than the original *** coated g-MoS2 nanosheets contributed more to CIP adsorption on the g-MoS2-BC composites due to their greater CIP adsorption capacity than the original ***,the synergistic effect was observed for CIP adsorption on g-MoS2-BC700,and suppression effect on *** addition,the adsorption of CIP onto g-MoS2-BC composites also exhibited strong dependence on the solution pH,since it can affect both the adsorbent surface charge and the speciation of *** was reasonably suggested that the mechanisms of CIP adsoiption on g-MoS2-BC composites involved pore-filling effects,k-k EDA interaction,electrostatic interaction,and ion exchange *** results are useful for the modification of biochar in exploiting the novel amendment for contaminated soils.

关键词： Adsorption Ciprofloxacin g-MoS2 nanosheets Biochar Soil remediation

Numerical investigation of the seismic response of a UHV composite bypass switch retrofitted with wire rope isolators

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Earthquake Engineering and Engineering Vibration 2021年第1期20卷 275-290页

作者： yang zhenyu Xie Qiang He Chang Xue Songtao Department of Civil Engineering Tongji UniversityShanghai 200092China

An ultra-high voltage(UHV)composite bypass switch(BPS)faces increasing seismic challenges when UHV projects extend to high seismic intensity *** UHV composite BPS still generates excessive stress at the bottom section although hollow composite insulators with high flexural strength are *** the standard retrofitting strategy by using stiffer supports cannot reduce stress responses,wire rope isolation is *** optimal design of isolation considers both stress and displacement responses since the slenderness and composite material of insulators contribute to significant *** results show that properly designed isolation can significantly reduce stress without excessive displacement responses.A larger radius configuration helps to improve the applicability of small stiffness isolators under high *** the isolation still cannot satisfy the requirement,smaller stiffness isolators with a larger radius,or isolators with increased loops and smaller radius,can be introduced to gain better energy dissipation capacity and effectiveness in response ***,a three-step design procedure is proposed to increase the damping force but fix the rotational stiffness of ***,the application of wire rope isolation can be extended to UHV composite BPS with a low natural frequency,but conductors with enough redundancy should be used.

关键词： UHV composite bypass switch seismic analysis seismic performance upgrading wire rope isolator

Experimental and numerical study of installing a dune model in a 90° bend in the horizontal-vertical pneumatic conveying system

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Particuology 2023年第8期79卷 95-108页

作者： zhenyu yang Fei Yan Panpan Tu Rui Zhu School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang212000China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212000China

In the pneumatic conveying process,particles move to the bend under the influence of inertia to form a particle rope,which will cause serious wear between the particles and the pipe wall,and then the dune model is designed and installed in the 90° bend to reduce energy consumption and wear in this ***,the minimum pressure drop velocity of particles transported by different size dune models was obtained through experimental *** the energy saving mechanism of the dune model is studied by CFD-DEM *** experimental results show that the installation of the dune model reduces the minimum pressure drop *** numerical simulation results show that the number of collisions between the particles and the tube wall in the vertical tube decreases after the installation of the dune model,which reduces the energy ***,the increasing of tail size of the dune model is beneficial to the diffusion and acceleration of the particles in the vertical tube.

关键词： Pneumatic conveying Dune model CFD-DEM Minimum pressure drop velocity Recursiveanalysis

Formalizing the General Plant for Development of Hybrid Process Control Systems

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Journal of Systems Engineering and Electronics 1998年第1期9卷 38-47页

作者： yang, zhenyu Chen, Zongji Li, Xuandong Beijing Univ of Aero and Astro China

Many process control systems are a kind of hybrid systems. In order to develop a satisfied control strategy, i. e., to make the whole system satisfy some processing requirements, the knowledge of plant is indispensable. This paper proposes a formal model for the general plant for a kind of process control systems. Based on the model, requirements for the system can be specified from goals, and the controller can be designed according to plant based formal approach . An industrial process control system is used to illustrate our models and methods. Duration Calculus, a real time interval logic, is utilized to specify some characters of the model and development of control program for the exemplified system.

关键词： Hybrid system Process control systems Duration calculus.

A Versatile Flow-Profile Engineering Method in the Stokes Flow Regime for Complex-Shaped Flows

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Engineering 2021年第5期7卷 655-662页

作者： zhenyu yang Lang Nan Ho Cheung Shum Department of Mechanical Engineering The University of Hong KongHong Kong 999077China

Flow profiles are frequently engineered in microfluidic channels for enhanced mixing,reaction control,and material ***,flow profiles are engineered by inducing inertial secondary flow to redistribute the streams,which can hardly be reproduced in microfluidic environments with negligible inertial *** employed symmetric channel structures also limit the variety of achievable flow ***,each of the flow profiles specifically corresponds to a strictly defined flow condition and cannot be generalized to other flow *** address these issues,we present a systematic method to engineer the flow profile using inertialess secondary *** flow is manipulated in the Stokes regime by deploying a cascaded series of microsteps with various morphologies inside a microchannel to shape the flow *** tuning the shapes of the microsteps,arbitrary outflow profiles can be customized.A numerical profile-transformation program is developed for rapid prediction of the output profiles of arbitrary sequences of predefined *** proposed method allows the engineering of stable flow profiles,including asymmetric ones,over a wide range of flow conditions for complex microfluidic environmental prediction and design.

关键词： Microfluidics Flow profile Stokes flow Hydrodynamic focusing Flow shaping

Surface effects on mechanical behavior of elastic nanoporous materials under high strain

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Applied Mathematics and Mechanics(English Edition) 2015年第7期36卷 927-938页

作者： Zixing LU Fan XIE Qiang LIU zhenyu yang School of Aeronautics Science and Engineering Beihang University

This paper studies surface effects on the mechanical behavior of nanoporous materials under high strains with an improved anisotropic Kelvin model. The stress-strain relations are derived by the theories of Euler-Bernoulli beam and surface elasticity. Mean- while, the influence of strut （or ligament） size on the mechanical properties of nanoporous materials is discussed, which becomes a key factor with consideration of the residual sur- face stress and the surface elasticity. The results show that the decrease in the strut diameter and the increase in the residual surface stress or the surface elasticity can both lead to an increase in the carrying capacity of nanoporous materials. F^lrthermore, me- chanical behaviors of anisotropic nanoporous materials in different directions （the rise direction and the transverse direction） are investigated. The results indicate that the sur- face effects in the transverse direction are more obvious than those in the rise direction for anisotropic nanoporous materials. In addition, the present results can be reduced to the cases of conventional foams as the strut size increases to micron-scale, which confirms validity of the model to a certain extent.

关键词： surface effect nanoporous anisotropy high strain

AlphaFold2 and its applications in the fields of biology and medicine

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Signal Transduction and Targeted Therapy 2023年第4期8卷 1630-1643页

作者： zhenyu yang Xiaoxi Zeng Yi Zhao Runsheng Chen West China Biomedical Big Data Center West China HospitalSichuan UniversityChengdu 610041China Key Laboratory of Intelligent Information Processing Advanced Computer Research CenterInstitute of Computing TechnologyChinese Academy of SciencesBeijing 100190China Key Laboratory of RNA Biology Center for Big Data Research in HealthInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China Pingshan Translational Medicine Center Shenzhen Bay LaboratoryShenzhen 518118China

AlphaFold2(AF2)is an artificial intelligence(AI)system developed by DeepMind that can predict three-dimensional(3D)structures of proteins from amino acid sequences with atomic-level *** structure prediction is one of the most challenging problems in computational biology and chemistry,and has puzzled scientists for 50 *** advent of AF2 presents an unprecedented progress in protein structure prediction and has attracted much *** release of structures of more than 200 million proteins predicted by AF2 further aroused great enthusiasm in the science community,especially in the fields of biology and ***2 is thought to have a significant impact on structural biology and research areas that need protein structure information,such as drug discovery,protein design,prediction of protein function,et *** the time is not long since AF2 was developed,there are already quite a few application studies of AF2 in the fields of biology and medicine,with many of them having preliminarily proved the potential of *** better understand AF2 and promote its applications,we will in this article summarize the principle and system architecture of AF2 as well as the recipe of its success,and particularly focus on reviewing its applications in the fields of biology and *** of current AF2 prediction will also be discussed.

关键词： system fields Fold

An incremental elastic-plastic cohesive constitutive model with considering damage

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Science China(Technological Sciences) 2023年第12期66卷 3651-3662页

作者： XIA Tong QIAN YiXing XU ShengYao yang zhenyu LU ZiXing Institute of Solid Mechanics School of Aeronautic Science and EngineeringBeihang University(BUAA)Beijing 100083China Aircraft&Propulsion Laboratory Ningbo Institute of Technology(NIT)Beihang University(BUAA)Ningbo 315832China

The interface has a significant influence on the macroscopic mechanical behaviors of composite materials,with interface cracking being a typical failure *** ability to precisely describe the mechanical behavior of the interface is critical for analyzing the failure of composite *** on plasticity theory and damage mechanics,an elastic-plastic interface constitutive model is developed to simulate the irreversible plastic deformation at the interface under the cyclic loading ***,by incorporating a damage factor in scalar form,the model is able to simulate mixed loading forms(Modes I and II).The influence of interfacial strength and toughness on the overall mechanical properties of unidirectional fiber reinforced composites under transverse loading is studied with this *** simulation results are consistent with the experimental data in the literature,demonstrating the model's *** model can be used to simulate the mechanical behavior of composites with interfaces under cyclic loading,and it is helpful for understanding the plastic behavior and damage accumulation at the interfaces in the composites.

关键词： interface cohesive zone model plasticity damage fiber reinforced composites