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Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82gd-0.2Zn-0.2Zr alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 136-146页

作者： Chenjin Zhang guangyu Yang lei xiao.zhiyo.g kan Jing guo Qiang Li Wanqi Jie State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China College of Chemistry and Environmental Science Qujing Normal UniversityQujing 655011China

Microstructure,texture,and mechanical properties of the extruded Mg-2.49Nd-1.82gd-0.2Zn-0.2Zr alloy were investigated at different extrusion temperatures(260 and 320℃),extrusion ratios(10:1,15:1,and 30:1),and extrusion speeds(3 and 6 mm/s).The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy,and the second phase showed streamline distribution along the extrusion direction(ED).With extrusion temperature increased from 260 to 320℃,the microstructure,texture,and mechanical properties of alloys changed *** dynamic recrystallization(DRX)degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1,and the strength gradually decreased but elongation(EL)*** the extrusion speed increased from 3 to 6 mm/s,the grain sizes and DRX degree increased significantly,and the samples presented the typical-rare-earth(RE)*** alloy extruded at 260℃ with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength(TYS)of 213 MPa and EL of 30.6%.After quantitatively analyzing the contribution of strengthening mechanisms,it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening *** results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.

关键词： Mg-rare earth alloys extrusion temperature extrusion ratio extrusion speed strengthening mechanisms

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Design high-performance narrowband emitters for blue light-emitting diodes through manipulating resonance structure of aromatic heterocycles

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Science China Chemistry 2025年

作者： Yue Yu lei Xu Wenle Tan Yuyu Pan Jiyin xiao Bohan Wang guangjun Tian Yuguang Ma lei Ying Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials State Key Laboratory of Luminescent Materials and Devices South China University of Technology School of Petrochemical Engineering Shenyang University of Technology Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University

Narrowband light-emitting materials play critical roles in improving the color gamut and energy consumption of electroluminescence. Herein we demonstrated that by regulating the ground state resonance structure form of emitters with polycyclic aromatic heterocycles, the high-energy vibration of the C–C bond can be effectively suppressed, resulting in narrow emission like classical cyanine dyes. The designed compounds consist of twist and planar conformation, while having differences in the orientation of the positioning electron-donating(nitrogen) and electron-accepting(carbonyl) groups in the polycyclic aromatic hydrocarbon skeleton. The resulting compound Ac-Ph-Ac with a dominated zwitterionic resonance structure exhibits a relatively wide electroluminescent profile with the full width at half maximum(FWHM) of 42 nm and moderate device performance. In contrast, the “soliton transition” of 2AcPh based on the cyanine limit character effectively suppresses C–C stretching vibration in the polycyclic aromatic heterocycle skeleton, leading to a narrow electroluminescent profile with FWHM of 30 nm(0.16 eV)associated with an impressively high external quantum efficiency of 28.52%, which is among the highest efficiencies of so far reported non-sensitized organic light-emitting diodes.

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Dual‑Donor‑Induced Crystallinity Modulation Enables 19.23% Efficiency Organic Solar Cells

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Nano-Micro Letters 2025年第3期17卷 376-388页

作者： Anhai Liang Yuqing Sun Sein Chung Jiyeong Shin kangbo Sun Chaofeng Zhu Jingjing Zhao Zhenmin Zhao Yufei Zhong guangye Zhang Kilwon Cho Zhipeng kan Center On Nanoenergy Research Institute of Science and Technology for Carbon Peak&NeutralitySchool of Physical Science&TechnologyGuangxi UniversityNanning 530004People’s Republic of China Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673South Korea College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118People’s Republic of China Zhejiang Engineering Research Center for Fabrication and Application of Advanced Photovoltaic Materials School of Materials Science and EngineeringNingboTech UniversityNingbo 315100People’s Republic of China State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures Nanning 530004People’s Republic of China

Trap-assisted charge recombination is one of the primary limitationsof restricting the performance of organic solar cells. However, effectivelyreducing the presence of traps in the photoactive layer remains ***, wide bandgap polymer donor PTzBI-dF is demonstrated as an effectivemodulator for enhancing the crystallinity of the bulk heterojunction active layerscomposed of D18 derivatives blended with Y6, leading to dense and orderedmolecular packings, and thus, improves photoluminescence quenching *** a result, the photovoltaic devices exhibit reduced trap-assisted charge recombinationlosses, achieving an optimized power conversion efficiency of over 19%.Besides the efficiency enhancement, the devices comprised of PTzBI-dF as athird component simultaneously attain decreased current leakage, improved chargecarrier mobilities, and suppressed bimolecular charge recombination, leading toreduced energy losses. The advanced crystalline structures induced by PTzBI-dFand its characteristics, such as well-aligned energy level, and complementaryabsorption spectra, are ascribed to the promising performance *** findings suggest that donor phase engineering is a feasible approach to tuning the molecular packings in the active layer, providingguidelines for designing effective morphology modulators for high-performance organic solar cells.

关键词： Trap-assisted charge recombination Photoluminescence Miscibility Current leakage Power conversion efficiency

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Temperature Profile of Black Hole Accretion Disc with Magnetic Coupling

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Communications in Theoretical Physics 2002年第8期38卷 247-252页

作者： lei Wei-Hua WANg Ding-Xiong xiao kan Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

Two new mapping relations between the angular coordinate on the black hole (BH) horizon and radialcoordinate on the disc are given according to the requirement of general relativity and Maxwell's equations, and theeffects of magnetic coupling (MC) on temperature of accretion disc are investigated by comparing with pure *** is shown that the MC effects on the temperature profile are related intimately to the BH spin, and the influenceon the peak value of disc temperature based on the modified mapping relations is not as great as that based on thelinear *** peak value and the corresponding radius of peak value ring of disc temperature do not increasemonotonically as the increasing spin of BH, each containing a maximum for the fast-spinning BH. The value ranges ofthe bolometric luminosity and color temperature of the disc are both extended by the MC effects.

关键词： black hole, accretion disc, magnetic coupling

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Reflection and Refraction of Waves Across an Interface of Two-phase Flow

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Acta Mathematicae Applicatae Sinica 2021年第1期37卷 137-147页

作者： Kai HU Hui kan Chun-lei TANg xiao-zhou YANg School of Mathematics and Statistics Southwest UniversityChongqing 400715China Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071China

We investigate a hyperbolic system of one-dimensional isothermal fluid with liquid-vapor phase *** refraction-reflection phenomena are intensively analyzed when elementary waves travel across the two-phase *** apply the characteristic method and hodograph transform of Riemann to reduce the nonlinear PDEs to a concise *** for the case of incident rarefaction wave,reduced linear equations are convenient to solve by Laplace *** an integral formula in wave interaction region is derived in this paper,instead of the hypergeometric functions solutions for non-isothermal polytropic *** is also observed that when incident waves travel from the vapor phase to the liquid phase,the refracted waves must be accelerated and move forward.

关键词： p-system two-phase fluid Hodograph transform Volterra equation

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Joint Probabilistic Scheduling and Resource Allocation for Wireless Networked Control Systems

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 258-260页

作者： Meng Zheng lei Zhang Wei Liang IEEE the State Key Laboratory of Robotics and the Key Laboratory of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences the University of Chinese Academy of Sciences

Dear Editor,This letter presents a joint probabilistic scheduling and resource allocation method(PSRA) for 5g-based wireless networked control systems(WNCSs). As a control-aware optimization method, PSRA minimizes the linear quadratic gaussian(LQg) control cost of WNCSs by optimizing the activation probability of subsystems, the number of uplink repetitions, and the durations of uplink and downlink phases. Simulation results show that PSRA achieves smaller LQg control costs than existing works.

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Investigation on the Quasi-Cycle of Black Hole Spin

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Chinese Physics Letters 2001年第3期18卷 466-468页

作者： WANg Ding-Xiong xiao kan lei Wei-Hua Department of Physics Huazhong University of Science and TechnologyWuhan 430074

A reverse condition of accretion flow and its constraints on black hole spin in the quasi-cycle are *** is shown that the necessary condition for the quasi-cycle is that the closed magnetic field lines must dominate over the open ones at the *** efficiency of converting accreted rest mass into radiation energy in the quasi-cycle is proved to increase as the strength of the magnetic transfer *** addition,a general expression for the efficiency is derived.

关键词： process. strength cycle

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Some Interesting Behaviour of Accreting Particles in the gap Region of Black Hole Accretion Discs

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Chinese Physics Letters 2001年第5期18卷 705-707页

作者： WANg Ding-Xiong xiao kan lei Wei-Hua Department of Physics Huazhong University of Science and TechnologyWuhan 430074

Some interesting behaviour of accreting particles in the gap region between the horizon of the Kerr black hole and the inner edge of the surrounding disc is *** following results are obtained:(i)Spacetime coincidence of the maximum of angular velocity of accreting particles and that of the black hole horizon is extended to the more general disc-accretion.(ii)The Possibilities is discussed of negative energy of accreting particles in prograde orbit inside the ergosphere of the Kerr black hole,which is surrounded by strong enough magnetic field.

关键词： horizon field. black

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Magnetic Coupling of a Rotating Black Hole with the Surrounding Accretion Disc

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Chinese Physics Letters 2001年第8期18卷 1150-1152页

作者： WANg Ding-Xiong xiao kan lei Wei-Hua Department of Physics Huazhong University of Science and TechnologyWuhan 430074

The evolution characteristics and energy extraction of a rotating black hole are investigated by considering magnetic coupling with the surrounding accretion *** is found that both mass and spin of the black hole might be reduced by the joint effects of disc accretion and magnetic coupling,provided that the latter is stronger than the *** efficiencies of the two energy mechanisms are calculated and compared to a variety of *** addition,the validity of the laws of black hole thermodynamics is discussed.

关键词： black coupling Coupling

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A New Approach to Evolution of Black Hole Accretion Disks

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Chinese Physics Letters 2000年第11期17卷 853-855页

作者： WANg Ding-Xiong lei Wei-Hua xiao kan Department of Physics Huazhong University of Science and TechnologyWuhan 430074

Evolution of black hole(BH)accretion disks is investigated by a new approach,in which the evolution of the central BH can be derived in terms of BH spin directly,and the evolution characteristics of the concerning BH parameters are shown more easily and *** an example,the unusual evolution characteristics of angular velocity of BH horizon and that of accreting particles at the inner edge of the disk are derived by considering the Blandford-Znajek process.

关键词： evolution horizon process.

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