Ji Ma

ORCID: 0000-0002-0029-3670
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About
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Research Areas
  • Photonic Crystals and Applications
  • Photonic and Optical Devices
  • Electromagnetic Scattering and Analysis
  • Quantum Information and Cryptography
  • Advanced Antenna and Metasurface Technologies
  • Electromagnetic Simulation and Numerical Methods
  • Optical Coatings and Gratings
  • Microwave Engineering and Waveguides
  • Quantum Mechanics and Applications
  • Photorefractive and Nonlinear Optics
  • Plasmonic and Surface Plasmon Research
  • Antenna Design and Analysis
  • Mechanical and Optical Resonators
  • Topological Materials and Phenomena
  • Electromagnetic Compatibility and Measurements
  • Neural Networks and Reservoir Computing
  • Metamaterials and Metasurfaces Applications
  • Photonic Crystal and Fiber Optics
  • Nonlinear Photonic Systems
  • Antenna Design and Optimization
  • Quantum and Classical Electrodynamics
  • Fern and Epiphyte Biology
  • Quantum Computing Algorithms and Architecture
  • Ultra-Wideband Communications Technology
  • Cavitation Phenomena in Pumps

Chinese Academy of Sciences
2015-2025

Beijing Forestry University
2025

Northeast Normal University
2024

China Aerospace Science and Technology Corporation
2024

Jiangsu University
2024

Liaoning Shihua University
2020-2021

Jiangsu University of Technology
2010-2020

Tongji University
2017-2019

Jilin Normal University
2013-2019

Xidian University
2010-2017

10.2528/pierc24111302 article Progress In Electromagnetics Research C 2025-01-01

Triangulene and its homologues are promising building blocks for high‐spin low‐dimensional networks with long‐range magnetic order. Despite the recent progress in synthesis characterization of coupled triangulenes, key parameters such as number organic linking units or their dihedral angles remain scarce, making further studies crucial an essential understanding implications. Here, we investigate reactivity two triangulene dimers linked by (Dimer 1) one 2) para‐biphenyl units, respectively,...

10.1002/ange.202501874 article EN cc-by Angewandte Chemie 2025-02-19

Large language models (LLMs) increasingly serve as human-like decision-making agents in social science and applied settings. These LLM-agents are typically assigned characters placed real-life contexts. However, how these contexts shape an LLM's behavior remains underexplored. This study proposes tests methods for probing, quantifying, modifying internal representations a Dictator Game -- classic behavioral experiment on fairness prosocial behavior. We extract ``vectors of variable...

10.31219/osf.io/8p7wg_v1 preprint EN 2025-04-18

10.1016/j.physe.2016.09.002 article EN Physica E Low-dimensional Systems and Nanostructures 2016-09-09

We propose a novel strategy to optimize sensing performance of the Bloch surface wave (BSW) biosensor. First all, one-dimensional photonic crystal with an omnidirectional bandgap is designed. Except for sustaining BSW, guarantees tiny full width at half maximum (FWHM=0.84 nm) reflection dip induced by BSW resonance. Then, specific dependence wavelength sensitivity on incident angle obtained impedance-matching method. Study shows that increases decreases in (larger than critical angle). At...

10.1364/ol.43.005375 article EN Optics Letters 2018-10-25

To speed up the conventional method of moments-physical optics (MoM-PO) solution process antennas mounted on electrically large platforms, a novel hybridizing adaptive integral (AIM) with PO is presented to solve coupled electric field equation (C-EFIE) resulted from MoM-PO method. In hybrid AIM-PO method, both MoM and regions are enclosed in cube equipping an auxiliary regular Cartesian grid. Then standard AIM procedure employed efficiently perform matrix-vector multiplications (MVMs)...

10.1109/tap.2013.2296326 article EN IEEE Transactions on Antennas and Propagation 2014-01-31

Abstract. In this paper, a novel series three-axis stable platform (STSP) is proposed, and its azimuth angle structure, pitch roll overall system structure scheme, control scheme are designed. The universal one. forward inverse kinematics dynamics models of the STSP pitch-and-roll mechanisms established, motion rules force conditions main components analyzed. Establish mathematical model system, analyze performance STSP, propose position velocity dual-closed-loop strategy, determine...

10.5194/ms-15-209-2024 article EN cc-by Mechanical sciences 2024-03-22

An ultra-high-speed centrifugal pump plays a crucial role as part of an aircraft engine’s fuel supply system. This paper focuses on the coupled vibration and optimization parallel double-stage considering fluid–structure interaction (FSI). The accuracy numerical calculation is verified compared with experimental results. steady transient characteristics rotor system are analyzed to ensure operational reliability Moreover, orthogonal test conducted explore structural existing cross-support...

10.3390/w16111471 article EN Water 2024-05-22

An efficient wide-band analysis that combines method of moments-physical optics (MoM-PO) hybrid formulation with the asymptotic waveform evaluation (AWE) technique is presented for antennas around an electrically large platform. To facilitate problems, compared MoM, MoM-PO employed to reduce number unknowns and memory requirements. Further, automatic differentiation (AD) approach used calculate high order frequency derivatives Green's functions required in algorithm. Numerical results show...

10.1109/tap.2012.2210272 article EN IEEE Transactions on Antennas and Propagation 2012-07-25

We numerically study the negative index properties of sandwiched metamaterials, perforated with a square array circle holes filled different media. Transmission spectra indicate that filling medium can effectively change position localized resonant peak, while keeping other transmission peaks hardly changed. Reflection and retrieved effective impedance verify an appropriate choice provide perfect match. Due to match, electromagnetic responses band based on internal surface plasmon polaritons...

10.1088/0256-307x/27/9/094101 article EN Chinese Physics Letters 2010-09-01

We investigate the band structure and topological phase transition of photonic time crystals (PTC)-systems in which physical parameter varies periodically time. find that PTC system can be revealed by wave vector gap (k-gap) size, was induced temporal refraction reflection. Interestingly, a zero-averaged refractive index k-gap is obtained when includes dispersive medium. This special invariant with modulation scaling at given frequency.

10.1364/oe.27.012914 article EN cc-by Optics Express 2019-04-24

10.1016/j.physe.2020.114517 article EN Physica E Low-dimensional Systems and Nanostructures 2020-10-31

An efficient method for wide‐band electromagnetic (EM) scattering properties analysis of three‐dimensional arbitrarily shaped perfectly electric conductor (PEC) objects is proposed in this study. The field integral equation (EFIE) solved by the moments (MoM) base on loop‐tree basis functions. EM not only can be achieved accurately high frequency band, but also low band within desired bandwidth using To improve computation efficiency, Maehly approximation utilised. Compared with direct...

10.1049/iet-map.2014.0189 article EN IET Microwaves Antennas & Propagation 2015-01-13

A novel mobius-band monopole antenna which is based on the concept of topology designed to realize ultra-wideband.Its UWB-related characteristics are simulated and experimentally verified. The results show that proposed has good radiation performances, illuminates a candidate for design. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1536–1539, 2010; Published online in InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25246

10.1002/mop.25246 article EN Microwave and Optical Technology Letters 2010-04-23

An efficient hybrid analysis that combines integral equations (IE) with physical optics (PO) approximation is presented for antennas around an electrically large platform. In the analysis, whole surface of platform and divided into two regions, namely, full-wave region PO region. region, IE modified by coupling contribution. Similar to fast method, impedance matrix decomposed near-field couplings well-separated group couplings, respectively. By interpolating Green's function, between groups...

10.1109/lawp.2011.2159697 article EN IEEE Antennas and Wireless Propagation Letters 2011-01-01

Under the action of pump light, conventional photonic crystal can be turned into function crystal. In paper, we have designed optical triode with one-dimensional crystal, and analyzed effect period number, medium thickness refractive index, incident angle, irradiation way intensity light on magnification. We obtain some valuable results, which shall help to optimal design triode.

10.1039/c5nr09081d article EN Nanoscale 2016-01-01

An improved current-based analysis combining the method of moments (MoM) with physical optics (PO) approximation is presented for antenna around an electrically large platform. In analysis, whole surface platform and divided into three regions, namely, MoM region, lit PO region shadowed respectively. The currents are modified by a simple non-uniform grid. Furthermore, new set pulse vector basis functions used to represent in region. primary objective applying these analyze radiation...

10.1163/156939311794500241 article EN Journal of Electromagnetic Waves and Applications 2011-01-01
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