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Chinese Journal of Chemistry 2023年第6期41卷 657-664页

作者： Hengyi Dai Jianping Zhou guoyun meng Lu Wang Lian Duan Dongdong Zhang Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University Beijing 100084China Center for Flexible Electronics Technology Tsinghua UniversityBejing 100084China

Emitters with narrowband spectra are of great importance nowadays because of the growing demand for ultra-high-definition displays in the fields of panel displays and solid-state *** the reported multiple resonance(MR)emitters have been widely studied with extremely sharp spectra and color-tunable emissions,the electrophilic borylation synthetic strategies and stable narrowband blue devices still face great challenges.

关键词： Ultrapure blue luminescence Boron-nitrogen bonds Fluorescence emitter Organic light-emitting diodes Indolocarbazole skeleton

Peripheral carbazole units-decorated MR emitter containing B−N covalent bond for highly efficient green OLEDs with low roll-off

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Journal of Semiconductors 2024年第8期45卷 59-66页

作者： Danrui Wan Jianping Zhou guoyun meng Ning Su Dongdong Zhang Lian Duan Junqiao Ding School of Chemical Science and Technology Yunnan UniversityKunming 650091China Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Southwest United Graduate School Kunming 650092China

Boron−nitrogen doped multiple resonance(BN-MR)emitters,characterized by B−N covalent bonds,offer distinctive advantages as pivotal building blocks for facile access to novel MR emitters featuring narrowband spectra and high ***,there remains a scarcity of exploration concerning synthetic methods and structural derivations to expand the library of novel BN-MR ***,we present the synthesis of a BN-MR emitter,tCz[B−N]N,through a one-pot borylation reaction directed by the amine group,achieving an impressive yield of 94%.The emitter is decorated by incorporating two 3,6-di-tbutylcarbazole(tCz)units into a B−N covalent bond doped BN-MR parent molecule via para-C−π−D and para-N−π−D *** peripheral decoration strategy enhances the reverse intersystem crossing process and shifts the emission band towards the pure green region,peaking at 526 nm with a narrowband full-width at half maximum(FWHM)of 41 ***,organic light emitting diodes(OLEDs)employing this emitter achieved a maximum external quantum efficiency(EQEmax)value of 27.7%,with minimal efficiency *** at a practical luminance of 1000 cd·m^(−2),the device maintains a high EQE value of 24.6%.

关键词： multi-resonance narrowband emission B−N covalent bond organic light emitting diodes

Self-Adaptive Discrete Cuckoo Search Algorithm for the Service Routing Problem with Time Windows and Stochastic Service Time

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Chinese Journal of Electronics 2023年第4期32卷 920-931页

作者： ZHANG guoyun WU meng LI Wujing OU Xianfeng XIE Wenwu School of Information Science and Engineering Hunan Institute of Science and Technology

Making house calls is very crucial to deal with the competitive pressures of the service business and to improve service quality. We design a model called service routing problem with time windows and stochastic service time(SRPTW-SST) that is based on vehicle routing problem with time windows. A self-adaptive discrete cuckoo search algorithm with genetic mechanism(sDCSGM) is proposed for the model SRPTW-SST. Moreover,we design a selection mechanism to improve the logicality of the algorithm based on the strong randomness of the Lévy flight. We introduce a genetic mechanism and design a neighborhood search mechanism for improving the robustness of the algorithm. In addition, an adaptive parameter adjustment method is designed to eliminate the impact of fixed parameters. The experimental results show that the sDCS-GM algorithm is more robust and effective than the state-of-the-art methods.

关键词： Adaptation models Vehicle routing Stochastic processes Routing Search problems Genetics Robustness

DYNAMIC CHARACTERISTICS OF SOILS SUBJECT TO IMPACT LOADINGS

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Acta Mechanica Solida Sinica 2008年第4期21卷 347-353页

作者： Zhirong Niu guoyun Lu Dongzuo Cheng College of Civil Engineering and Architecture Jiaxing University Jiaxing Zhejiang 314001 China Institute of Application Mechanics Taiyuan University of Technology Shanxi Taiyuan 030024 China Taiyuan University Shanxi Taiyuan 030026 China

The dynamic properties of soil under impact loads are studied experimentally and numerically. By analyzing the microstructural photos of soils with and without impact, it is shown that impact loads can destroy the original structures in the compact area, where the soil grains are rearranged regularly and form the compact whirlpool structure. Simultaneously, the dynamic impact process of soil is simulated by using the software of Ls-dyna. The time-dependent distribution of the dynamic stress and density is obtained in the soil. Furthermore, the simulation results are consistent with the experimental results. The reinforcement mechanism and the rule of dynamic compaction of soils due to impact load are also elucidated.

关键词： dynamic destruction impact soil dynamic consolidation

NONLINEAR FLEXURAL WAVES IN LARGE-DEFLECTION BEAMS

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Acta Mechanica Solida Sinica 2009年第4期22卷 287-294页

作者： Shanyuan Zhang Zhifang Liu guoyun Lu Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024 China

The equation of motion for a large-deflection beam in the Lagrangian description are derived using the coupling of flexural deformation and midplane stretching as a key source of nonlinearity and taking into account the transverse, axial and rotary inertia effects. Assuming a traveling wave solution, the nonlinear partial differential equations are then transformed into ordinary differential equations. Qualitative analysis indicates that the system can have either a homoclinic orbit or a heteroclinic orbit, depending on whether the rotary inertia effect is taken into account. Furthermore, exact periodic solutions of the nonlinear wave equations are obtained by means of the Jacobi elliptic function expansion. When the modulus of the Jacobi elliptic function m→1 in the degenerate case, either a solitary wave solution or a shock wave solution can be obtained.

关键词： large-deflection beam nonlinear flexural wave Jacobi elliptic function expansion

Self-Adaptive Discrete Cuckoo Search Algorithm for the Service Routing Problem with Time Windows and Stochastic Service Time

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Chinese Journal of Electronics 2023年

作者： OU Xianfeng WU meng LI Wujing ZHANG guoyun XIE Wenwu School of Information Science and Engineering Hunan Institute of Science and Technology

Making house calls is very crucial to deal with the competitive pressures of the service business and to improve service quality. We design a model called service routing problem with time windows and stochastic service time (SRPTW-SST) that is based on vehicle routing problem with time windows (VRPTW). A self-adaptive discrete Cuckoo Search Algorithm with genetic mechanism (sDCS-GM) is proposed for the SRPTW-SST. We design a selection mechanism to improve the logicality of the algorithm based on the strong randomness of the Lévy flight. We introduce a genetic mechanism and design a neighborhood search mechanism for improving therobustness of the algorithm. An adaptive parameter adjustment method is designed to eliminate the impact of fixed parameters. The experimental results show that the s DCS-GM algorithm is more robust and effective than the state-of-the-art methods.

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Hydrophobic organic coating based water–solid TENG for water-flow energy collection and self-powered cathodic protection

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Frontiers of Materials Science 2021年第4期15卷 601-610页

作者： Yupeng LIU guoyun SUN Ying LIU Weixiang SUN Daoai WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Institute of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266100China

Water-solid triboelectric nanogenerators(TENGs),as new energy collection devices,have attracted increasing attention in ocean energy harvesting and selfpowered *** acid(PAA)coating,usually used on the surface of marine equipment,has the property of anti-aging and anti-wear but limits triboelectrical output when used with *** this paper,polyacrylic acid coating was modified with fluorinated polyacrylate resin(F-PAA)to increase its triboelectrical output,by 6 times,and also to increase its anti-corrosion *** addition,the corrosion resistance property can be further enhanced by cathodic protection using the electrical output generated by the water-flow triboelectrical energy transfer *** their easy fabrication,water-flow energy harvesting,and corrosion resistance,PAA/F-PAA coating-based TENGs have promising applications in river and ocean energy collection and corrosion protection.

关键词： TENG hydrophobic coating energy collection anticorrosion cathodic protection

Topology Optimization with Aperiodic Load Fatigue Constraints Based on Bidirectional Evolutionary Structural Optimization

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Computer Modeling in Engineering & Sciences 2022年第1期130卷 499-511页

作者： Yongxin Li guoyun Zhou Tao Chang Liming Yang Fenghe Wu Heavy-Duty Intelligent Manufacturing Equipment Innovation Center of Hebei Province School of Mechanical EngineeringYanshan UniversityQinhuangdaoChina Space Star Technology Co. Ltd.BeijingChina

Because of descriptive nonlinearity and computational inefficiency,topology optimization with fatigue life under aperiodic loads has developed slowly.A fatigue constraint topology optimization method based on bidirectional evolutionary structural optimization(BESO)under an aperiodic load is proposed in this *** viewof the severe nonlinearity of fatigue damagewith respect to design variables,effective stress cycles are extracted through transient dynamic *** on the Miner cumulative damage theory and life requirements,a fatigue constraint is first quantified and then transformed into a stress ***,a normalized termination criterion is proposed by approximatemaximum stress measured by global stress using a P-normaggregation ***,optimization examples show that the proposed algorithm can not only meet the requirements of fatigue life but also obtain a reasonable configuration.

关键词： Topology optimization bidirectional evolutionary structural optimization aperiodic load fatigue life stress constraint

DENTING AND FAILURE OF LIQUID-FILLED TUBES UNDER LATERAL IMPACT

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Acta Mechanica Solida Sinica 2012年第6期25卷 609-615页

作者： guoyun Lu Jianping Lei Zhijun Han Zhifang Liu Shanyuan Zhang Institute of Applied Mechanics Taiyuan University of Technology

In this paper, numerical simulation of impact cases of liquid-filled tube impacted by missiles is conducted with a commercial finite element code LS-DYNA, and the results obtained are compared with the experimental data to verify the validity of the numerical simulation model adopted. With the verified numerical method, the processes of dynamic response of a blunt indenter impacting an empty or liquid-filled three-span continuous tubular beam are studied when the parameter such ms the indenter＇s mass, liquid＇s density or impact velocity is varied and the other conditions are kept the same. The simulation results indicate that the criticM perforation energy and the deformation of the wall of the pipe are significantly influenced by the presence of the liquid and the pressure. The liquid filling the tube provides a ＇foundation＇ pressure to resist and localize the deformation, which may affect the perforation process and lead to a reduction of the ballistic limit. The simulation results also indicate that the increase of the fluid density filled in the tube will decrease the ballistic limit, but the fluid density must be in some scope. The relationship between the ballistic limit velocity of the tube and the mass of the impact missile is nonlinear in the Cartesian coordinate while it becomes linear through logarithmic transformation.

关键词： impact perforation fluid-structure interaction tube

Isoscalar-vector interaction and its influence on the hadron-quark phase transition

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Nuclear Science and Techniques 2013年第5期24卷 122-126页

作者： SHAO guoyun COLONNA Maria DI TORO Massimo LIU Yuxin LIU Bo Department of Applied Physics Xi'an Jiao Tong University INFN-Laboratori Nazionali del Sud Via S. Sofia 62 Department of Physics and Astronomy University of CataniaVia S.Sofia 64 Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Institute of High Energy Physics Chinese Academy of Sciences Theoretical Physics Center for Scientific Facilities Chinese Academy of Sciences

The hadron-quark phase transition is studied with the newly constructed Hadron-Poyakov-Nambu- Jona-Lasinio(PNJL) ***,in the description of quark matter,we include the isoscalar-vector *** the constraints of neutron star observations,our calculation shows the isoscalar-vector interaction between quarks is indispensable if massive hybrids star exist in the *** strength determines the onset density of quark matter,and the mass-radius relations of hybrid ***,as a connection with heavy-ion-collision experiments,we discuss the strength of isoscalar-vector interaction and its effect on the signals of hadron-quark phase transition in heavy-ion collisions,such as NICA at JINR-Dubna and FAIR at GSI-Darmstadt.

关键词：同位旋矢量夸克物质相互作用强子相变重离子碰撞实验中子星计算表