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Chinese Physics B 2021年第10期30卷 470-475页

作者： bin liu Hong Zhou School of Physics and Electronics Hunan UniversityChangsha 410082China

We present a controlled,stepwise formation of layered semiconductor Bi_(2)O_(2)Se thin films prepared via the vapour process by annealing topological insulator Bi_(2)Se3 thin films in low oxygen atmosphere for different *** based on Bi_(2)O_(2)Se thin film show a responsivity of 1.7×10^(4) A/W at a wavelength of 980 ***-effect transistors based on Bi_(2)O_(2)Se thin film exhibit n-type behavior and present a high electron mobility of 17 cm^(2)/V·*** addition,the electrical properties of the devices after 4 months keeping in the air shows little change,implying outstanding air-stability of our Bi_(2)O_(2)Se thin *** the obtained results,it is evident that low oxygen annealing is a surprisingly effective method to fabricate Bi_(2)O_(2)Se thin films for integrated optoelectronic applications.

关键词： thin films Bi_(2)Se_(3) vapor-phase deposition photodetector Bi_(2)O_(2)Se

Making fully printed perovskite solar cells stable outdoor with inorganic superhydrophobic coating

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Journal of Energy Chemistry 2020年第11期29卷 332-338页

作者： Jianqiang Luo Hong bin Yang Mingxiang Zhuang Shujuan liu Liang Wang bin liu State Key Laboratory of Nuclear Resources and Environment.East China University of Technology.Nanchang 330013 JiangxiChina School of Chemical&Biomedical Engineering(SCBE) Nanyang Technological University62 Nanyang DriveSingapore 637459Singapore Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

Outdoor environment including moisture, dust, UV, oxygen and thermal stress(repeated heating-cooling)is devastating to perovskite solar cells(PSCs). Here, we demonstrate a new strategy to make fully printed PSCs stable with maximum power output in outdoor environment by coating them with a porous hydrophobic inorganic layer. After coating, the PSCs can maintain superior stability of more than 150 days of outdoor storage, 240 h of continuous operation at the maximum power output point in ambient air with relative humidity as high as ~80%, and stable operation for more than 10 h under raining condition. ANSYS simulation shows that the thin and porous nature of the inorganic coating layer offers much better heat dissipation than conventional encapsulation methods using glasses attached by photocurable epoxy. A similar thermal expansion coefficient of the inorganic encapsulation material with the solar cell substrate can also prevent it from cracking after repeated heating-cooling cycles. All of these merits resulted from our encapsulation method endow the perovskite solar cells with the real outdoor working capability.

关键词： Perovskite solar cells Inorganic encapsulation Heat dissipation Outdoor stability

Direct Growth of Enclosed ZnO Nanotubes

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Nano Research 2009年第3期2卷 201-209页

作者： bin liu Chun Zeng Department of Chemical and Biomolecular Engineering Minerals Metalsand Materials Technology Center(M3TC)Faculty of EngineeringNational University of Singapore10 Kent Ridge CrescentSingapore 119260

To date,wet syntheses of single-crystalline ZnO micro-and nanotubes have been carried out using a two-step indirect approach in which a selective dissolution step is required in order to create the vacant space in the tubular *** this work,we develop a direct growth process for preparation of single-crystal ZnO nanotubes and *** also report that a concave shaped crystal growth front is generally reactive and offers a large surface area for matter deposition during rapid expansion of unidirectional *** on the degree of supersaturation of nutrients in solution,the concave growth front can either remain unaltered or undergo a concave-to-convex transformation,leading to the growth of solid nanorods and/or hollow *** observed volume inversion should,in principle,also be applicable to the nanoarchitecture of other one-dimensional wurtzite structured nanomaterials,although individual sets of synthesis parameters need to be developed for each target material.

关键词： Nanotubes zinc oxide crystal grwoth

Domain-switching embedded nonlinear electromechanical finite element method for ferroelectric ceramics

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Science China(Physics,Mechanics & Astronomy) 2011年第4期54卷 606-617页

作者： liu bin FANG DaiNing Key laboratory of Applied Mechanics Department of Engineering Mechanics Tsinghua University Beijing 100084 China

To simulate the nonlinear behavior of ferroelectric structures and devices under non-uniform electromechanical loadings,a domain-switching embedded electromechanical finite element method is developed in this *** continuum assumption,the electromechanical behavior of each representative material point can be obtained by averaging the behavior of the local corresponding microstructure,e.g.42 domains used in this work.A new Double Gibbs free energy criterion for domain-switching is proposed to ensure the convergence and stability of the simulations on ferroelectrics under non-uniform *** computational examples are given to demonstrate that this nonlinear finite element method can yield reasonable and stable simulation results which can be used to explain some experimental results and assist the design of ferroelectric devices.

关键词： ferroelectric material domain-switching finite element method nonlinear electromechanical coupling crack and fracture

ProSy: API-Based Synthesis with Probabilistic Model

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Journal of Computer Science & Technology 2020年第6期35卷 1234-1257页

作者： bin-bin liu Wei Dong Jia-Xin liu Ya-Ting Zhang Dai-Yan Wang College of Computer Science National University of Defense TechnologyChangsha 410072China Key Laboratory of Software Engineering for Complex Systems College of Computer ScienceNational University of Defense TechnologyChangsha 410072China

Program synthesis is an exciting topic that desires to generate programs satisfying user intent automatically. But in most cases, only small programs for simple or domain-specific tasks can be synthesized. The major obstacle of synthesis lies in the huge search space. A common practice in addressing this problem is using a domain-specific language, while many approaches still wish to synthesize programs in general programming languages. With the rapid growth of reusable libraries, component-based synthesis provides a promising way, such as synthesizing Java programs which are only composed of APIs (application programming interfaces). However, the efficiency of searching for proper solutions for complex tasks is still a challenge. Given an unfamiliar programming task, programmers would search for API usage knowledge from various coding resources to reduce the search space. Considering this, we propose a novel approach named ProSy to synthesize API-based programs in Java. The key novelty is to retrieve related knowledge from Javadoc and Stack Overflow and then construct a probabilistic reachability graph. It assigns higher probabilities to APIs that are more likely to be used in implementing the given task. In the synthesis process, the program sketch with a higher probability will be considered first;thus, the number of explored reachable paths would be decreased. Some extension and optimization strategies are further studied in the paper. We implement our approach and conduct several experiments on it. We compare ProSy with SyPet and other state-of-the-art API-based synthesis approaches. The experimental results show that ProSy reduces the synthesis time of SyPet by up to 80%.

关键词： application programming interface(API)-based program Petri net probabilistic reachability graph program synthesis

TransDFL:Identification of Disordered Flexible Linkers in Proteins by Transfer Learning

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Genomics, Proteomics & Bioinformatics 2023年第2期21卷 359-369页

作者： Yihe Pang bin liu Schol of Computer Science and Technology Bejing Institute of Technology Bejing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Disordered flexible linkers(DFLs)are the functional disordered regions in proteins,which are the sub-regions of intrinsically disordered regions(IDRs)and play important roles in connecting domains and maintaining inter-domain *** with the limited available DFLs,the existing DFL predictors based on the machine learning techniques tend to predict the ordered residues as DFLs,leading to a high false positive rate(FPR)and low prediction *** studies have shown that DFLs are extremely flexible disordered regions,which are usually predicted as disordered residues with high confidence[P(D)>0.9]by an IDR ***,transferring an IDR predictor to an accurate DFL predictor is of great significance for understanding the functions of *** this study,we proposed a new predictor called TransDFL for identifying DFLs by transferring the RFPR-IDP predictor for IDR identification to the DFL *** RFPR-IDP was pre-trained with IDR sequences to learn the general features between IDRs and DFLs,which is helpful to reduce the false positives in the ordered ***-IDP was fine-tuned with the DFL sequences to capture the specific features of DFLs so as to be transferred into the *** results of two application scenarios(prediction of DFLs only in IDRs or prediction of DFLs in entire proteins)showed that TransDFL consistently outperformed other existing DFL predictors with higher accuracy.

关键词： Intrinsicallydisordered protein Disordered flexible linker Falsepositiverate Computational predictor Transferlearning

INVESTIGATION ON APPLICABILITY OF VARIOUS STRESS DEFINITIONS IN ATOMISTIC SIMULATION

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Acta Mechanica Solida Sinica 2009年第6期22卷 644-649页

作者： Ran Xu bin liu AML Department of Engineering Mechanics Tsinghua University Beijing 100084 China

How to correctly extract Cauchy stress from the atomistic simulations is a crucial issue in studying the mechanical behaviours of atomic systems, but is still in controversy. In this paper, three typical atomistic simulation examples are used to validate various existing stress definitions. It is found that the classical virial stress fails in predicting the stresses in these examples, because the velocity depends on the choice of the local average volume or the reference frame velocity and other factors. In contrast, the Lagrangian cross-section stress and Lagrangian virial stress are validated by these examples, and the instantaneous Lagrangian atomic stress definition is also proposed for dynamical problems.

关键词： atomic stress virial stress atomistic simulation

Networked guaranteed cost PID attitude tracking control of a laboratory flight system

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High Technology Letters 2021年第3期27卷 310-319页

作者： liu Yicai liu bin Engineering Research Center for Metallurgical Automation and Detecting Technology of Ministry of Education Institute of Information Science and EngineeringWuhan University of Science and Technologyuhan 430081P.R.China School of Mechanical-Electronic and Automobile Engineering Wuhan Business UniversityWuhan 430056P.R.China

This paper investigates the networked flight control system for a laboratory 3 degrees of freedom (3-DOF) helicopter,and presents a novel networked guaranteed cost proportion-integration-differentiation (PID) attitude tracking control method with consideration of time-varying delay and packet *** the 3-DOF helicopter characteristics of multi-input multi-output (MIMO),channel coupling,and nonlinearity,a genera linear time delay system is modeled by analyzing the motions on elevation,pitch,and travel *** using the reciprocal convex approach,the free weight matrix,and the cone complementarity linearization (CCL) method,the PID tracking controller parameters can be designed if the related linear matrix inequalities (LMIs) are ***,a practical experiment of laboratory 3-DOF helicopter is given,and the experimental results show that the proposed method is effective.

关键词： time-varying delay packet dropout networked flight control system tracking control

Robust H∞ output tracking control of uncertain networked control systems

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High Technology Letters 2019年第3期25卷 316-325页

作者： liu Yicai liu bin Engineering Research Center for Metallurgical Automation and Detecting Technology of Ministry of Education/Institute of Information Science and Engineering Wuhan University of Science and TechnologyWuhan 430081P.R.China School of Mechanical-electronic and Automobile Engineering Wuhan Business UniversityWuhan 430056P.R.China

This paper investigates a problem of robust output tracking control of networked control systems(NCSs) with network-induced delays, packet dropouts, parameter uncertainties and external disturbances. Firstly, an augmented model of time-delay system is proposed for networked tracking control systems. Then, considering the piecewise differentiable characteristic of time-delay, the criterion to output tracking performance analysis and controller design are derived by using an approach of free weighting matrix, reciprocally convex and cone complementarity linearization(CCL). Finally, simulation results of numerical examples show the effectiveness of the proposed approach, and illustrate the advantages of the proposed criteria which outperform previous criteria in the literature.

关键词： networked control systems(NCSs) H∞ output tracking control time-delay systems cone complementarity linearization

A Result on the Quasi-periodic Solutions of Forced Isochronous Oscillators at Resonance

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Chinese Annals of Mathematics,Series B 2015年第4期36卷 523-542页

作者： bin liu Yingchao TANG LMAM School of Mathematical Sciences Peking University

In this paper, the authors are concerned with the forced isochronous oscillators with a repulsive singularity and a bounded nonlinearity x'' + V'(x) + g(x) = e(t, x, x'),where the assumptions on V, g and e are regular, described precisely in the *** a variant of Moser's twist theorem of invariant curves, the authors show the existence of quasi-periodic solutions and boundedness of all solutions. This extends the result of liu to the case of the above system where e depends on the velocity.

关键词： Isochronous oscillators Repulsive singularity Invariant curves Timereversibility Quasi-periodic solutions Lazer-Landesman conditions Boundedness of solutions