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The m1A modification of tRNAs:a translational accelerator of T-cell activation

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Cellular & Molecular Immunology 2022年第12期19卷 1328-1329页

作者： cheng Chen Lilin Ye Institute of Immunology Third Military Medical UniversityChongqing400038China

Upon antigen stimulation,naïve T cells exit the quiescent state and undergo rapid clonal expansion and differentiation[1].This cell fate transition requires accelerated protein synthesis,which is regulated at both the transcriptional and translational levels[2,3].Compared with well-documented transcriptional regulatory mechanisms,the translational regulation of T-cell activation has not been fully elucidated.A recent study by Liu et al.

关键词： activation translational accelerator

Coarse-fine joint target parameter estimation method based on AN-RSC in OFDM passive radar

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Journal of Systems Engineering and Electronics 2024年第2期35卷 339-349页

作者： WANG Chujun WAN Xianrong YI Jianxin cheng Feng School of Electronic Information Wuhan UniversityWuhan 430072China

In this paper,we study the accuracy of delay-Doppler parameter estimation of targets in a passive radar using orthogonal frequency division multiplexing(OFDM)signal.A coarse-fine joint estimation method is proposed to achieve better estimation accuracy of target parameters without excessive computational ***,the modulation symbol domain(MSD)method is used to roughly estimate the delay and Doppler of ***,to obtain high-precision Doppler estimation,the atomic norm(AN)based on the multiple measurement vectors(MMV)model(MMV-AN)is used to manifest the signal sparsity in the continuous Doppler *** the same time,a reference signal compensation(RSC)method is presented to obtain highprecision delay *** results based on the OFDM signal show that the coarse-fine joint estimation method based on AN-RSC can obtain a more accurate estimation of target parameters compared with other *** addition,the proposed method also possesses computational advantages compared with the joint parameter estimation.

关键词： passive radar orthogonal frequency division multiplexing(OFDM)signal atomic norm(AN) parameter estimation

Reduced graphene oxide doping flower-like Fe_(7)S_(8) nanosheets for high performance potassium ion storage

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Journal of Energy Chemistry 2021年第3期30卷 604-611页

作者： Na cheng Xiaoyan Chen Lushuang Zhang Zhigang Liu School of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082HunanChina

Finding easy-to-operate strategy to obtain anode material with well-designed structure and excellent electrochemical performance is necessary to promote the development of the future potassium-ion batteries(PIBs).In this work,we synthesized reduced graphene oxide doping flower-like Fe_(7)S_(8) nanosheets electrode materials using one-step hydrothermal *** rGO@Fe_(7)S_(8) composite is composed of homogeneous Fe_(7)S_(8) and reduced graphene oxide thin *** unique structure not only promotes the penetration of electrolyte and increases the conductive of the pure Fe_(7)S_(8) electrode materials,but also relieves the volume expansion of K^(+) during charge/discharge *** applied this interesting anode electrode for PIBs,the rGO@Fe_(7)S_(8) exhibits excellent electrochemical *** delivers a high reversible specific capacity of 445 mAh g^(-1) at 50 mA g^(-1),excellent rate performance(284 mAhg^(-1)at 500 mA g^(-1) and 237 mAh g^(-1) at 1000 mA g^(-1)),and a high cycling stability at 100 mA g^(-1)(maintained 355 mAh g^(-1) after 300 cycles).

关键词： RGO@Fe_(7)S_(8) Doping Reduced graphene oxide Potassium ion storage Flower-like Nanosheets

Carbon-based functional materials for atmospheric water utilization

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Nano Research 2023年第11期16卷 12491-12505页

作者： Wenya He Tengyu Lin Huhu cheng Liangti Qu Laboratory of Flexible Electronics Technology Key Laboratory of Organic Optoelectronics&Molecular EngineeringMinistry of EducationDepartment of ChemistryState Key Laboratory of Tribology in Advanced Equipment(SKLT)Tsinghua UniversityBeijing 100084China

Atmospheric water,as one of the most abundant natural resources on Earth,has attracted huge research interest in the field of water harvesting and energy harvesting and conversion owing its environmental friendliness and easy *** developments of new materials have seen advanced technologies that can extract water and energy out of this long-neglected resource,suggesting a promising and sustainable approach to address the water and energy crises over the ***-based functional materials have been considered to be indispensable materials for atmospheric water utilization due to their large surface area,excellent adsorption performance,and higher surface *** this review,first,we analyze the interaction between carbon-based functional materials and atmospheric water ***,technologies developed in recent years for atmospheric water utilization based on carbon-based functional materials are reviewed,mainly focusing on atmospheric water harvesting,moisture-enabled electricity generation,and moisture-responsive ***,the remaining challenges and some tentative suggestions possibly guiding developments are proposed,which may pave a way for a bright future of carbon-based functional material in the utilization of atmospheric water.

关键词： carbon-based functional material atmospheric water atmospheric water harvesting moisture-enabled power generator moisture actuators

Overview of Resilient Traction Power Supply Systems in Railways with Interconnected Microgrid

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CSEE Journal of Power and Energy Systems 2021年第5期7卷 1122-1132页

作者： Peng cheng Huiwen Kong Jing Ma Limin Jia China Institute of Energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China

In recent years,the achievement of a renewable and sustainable traction power supply system(TPSS)in the rail sector has become a significant *** on this issue,this paper firstly provides a comprehensive overview and classification of the state-of-art TPSSs in DC and AC ***,together with low voltage(LV)DC,medium voltage(MV)DC,LV AC,and hybrid AC/DC interconnected microgrid(IMGs),various architectures of resilient TPSSs are proposed for renewable energy integration into DC and AC *** resilient TPSS offers on-site access and local consumption of renewable sources alongside railways and guarantees a sustainable power supply in the case of grid disturbances and failures,e.g.,voltage unbalance,harmonic and violent fluctuation,power outage,and extreme events in the wake of natural disasters and extreme *** approach also helps facilitate the development of the next generation TPSSs for enhanced flexibility and ***,based on a comparative analysis of different resilient TPSSs,a brief outlook of the future trend is ***,it is concluded that resilient TPSS provides a universal solution for both renewable energy integration and high-quality power supply against grid disturbances and failures.

关键词： Interconnected microgrid resilient traction power supply system renewable source railway electrification

A COUPLING MODEL OF WATER FLOWS AND GAS FLOWS IN EXHAUSTED GAS BUBBLE ON MISSILE LAUNCHED UNDERWATER

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Journal of Hydrodynamics 2007年第4期19卷 403-411页

作者： cheng Yong-sheng LIU Hua Department of Engineering Mechanics Shanghai Jiaotong University Shanghai 200030 China

The gas and water flows during an underwater missile launch are numerically studied. For the gas flow, the explicit difference scheme of Non-oscillation and Non-free-parameter Dissipation (NND) is utilized to solve the Euler equations for compressible fluids in the body-fitted coordinates. For the water flow, the Hess-Smith method is employed to solve the Laplace equation for the velocity potential of irrotational water flows based on the potential theory and the boundary element method. The hybrid Eulerian-Lagrangian formulation for the free boundary conditions is used to compute the changes of the free surface of the exhausted gas bubble in time stepping. On the free surface of the exhausted gas bubble, the matched conditions of both the normal velocities and pressures are satisfied. From the numerical simulation, it is found that the exhausted gas bubble grows more rapidly in the axial direction than in the radial direction and the bubble will shrink at its "neck" finally. Numerical results of the movement of the shock wave and the distribution of the Mach number and the gas pressure within the bubble were presented, which reveals that at some time, the gas flow in the Laval nozzle is subsonic and the gas pressure in the nozzle is very high. Influences of various initial missile velocities and chamber total pressures and water depths on both the time interval when the gas flow in the nozzle is subsonic and the peak of the gas pressure at the nozzle end were discussed. It was suggested that a reasonable adjustment of the chamber total pressure can improve the performance of the engine during the underwater launch of missiles.

关键词： exhausted gas bubble Laval nozzle missile launched underwater shock wave gas jet

Reading comprehension based on visualization of eye tracking and EEG data

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Science China(Information Sciences) 2020年第11期63卷 276-289页

作者： Shiwei cheng Yilin HU Jing FAN Qianjing WEI School of Computer Science and Technology Zhejiang University of Technology

Using eye tracking technology can help us understand reading behavior. Furthermore, sharing the teacher’s eye tracking features resulted in improving the students’ comprehension of the same reading material [1]. On ... 详细信息

关键词： N/A null no key words eye tracking EEG

Fatigue life improvement and grain growth of gradient nanostructured industrial zirconium during high cycle fatigue

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Journal of Materials Science & Technology 2021年第28期87卷 101-107页

作者： Conghui Zhang Xiangkang Zeng Jiapeng cheng Yaomian Wang School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055China

The effect of surface gradient nanostructure on the fatigue life of commercial pure(CP)Zr was *** point bending fatigue tests indicated that the fatigue limit of CP Zr with surface gradient nanostructure was increased by about 28.3%compared with the original sample(annealed state).The microstructure evolution at different fatigue loading stages was *** high strength of surface gradient nanostructure could increase the crack initiation ***,electron back scattered diffraction(EBSD)analysis demonstrated that the surface nanocrystals grew and rotated gradually during the fatigue loading,which was beneficial to reducing stress concentration,inhibit fatigue crack initiation,and prolong crack initiation *** stored distortion energy of CP Zr calculated before and after fatigue indicated that the stored distortion energy decreased dramatically during cyclic loading,which provided the driving force for grain ***,the growth of nanocrystals consumed the mechanical energy produced by the applied load to a certain extent,thus,slowing down the accumulation of fatigue *** coarse grains at the interior could deform plastically and reduce the crack growth *** addition,the compressive residual stress caused by USSP treatment reduced the local effective stress and the driving force of crack growth.

关键词： High cycle fatigue Industrial pure zirconium Grain growth Surface gradient nanostructure

Structured 3D linear space–time light bullets by nonlocal nanophotonics

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Light(Science & Applications) 2021年第9期10卷 1687-1701页

作者： cheng Guo Meng Xiao Meir Orenstein Shanhui Fan Department of Applied Physics Stanford UniversityStanfordCA94305USA Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and Technology Wuhan UniversityWuhan430072China Andrew&Erna Viterbi Department of Electrical Engineering Technion–Israel Institute of TechnologyHaifa32000Israel Ginzton Laboratory and Department of Electrical Engineering Stanford UniversityStanfordCA94305USA

We propose the generation of 3D linear light bullets propagating in free space using a single passive nonlocal optical *** nonlocal nanophotonics can generate space–time coupling without any need for bulky pulse-shaping and spatial modulation *** approach provides simultaneous control of various properties of the light bullets,including the external properties such as the group velocity and the propagation distance,and internal degrees of freedom such as the spin angular momentum and the orbital angular momentum.

关键词： surface angular nonlocal