A5001611439- Magnetic confinement fusion research
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Scientific Measurement and Uncertainty Evaluation
- Advanced Fiber Laser Technologies
- Ionosphere and magnetosphere dynamics
- Atomic and Molecular Physics
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Nuclear reactor physics and engineering
- Cardiovascular Syncope and Autonomic Disorders
- Plasma Diagnostics and Applications
- Mass Spectrometry Techniques and Applications
- Polar Research and Ecology
- Soil Carbon and Nitrogen Dynamics
- SARS-CoV-2 and COVID-19 Research
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Respiratory viral infections research
- Advanced DC-DC Converters
- Advanced Neural Network Applications
Chinese Academy of Sciences
2016-2025
Nanjing University of Information Science and Technology
2025
State Key Laboratory of Applied Optics
2025
Changchun Institute of Optics, Fine Mechanics and Physics
2025
University of Chinese Academy of Sciences
2020-2025
State Key Laboratory of Polymer Physics and Chemistry
2025
Changchun Institute of Applied Chemistry
2025
National Changhua University of Education
2025
Institute of Plasma Physics
2013-2024
Hefei Institutes of Physical Science
2022-2024
Mastering nuclear fusion, which is an abundant, safe, and environmentally competitive energy, a great challenge for humanity. Tokamak represents one of the most promising paths toward controlled fusion. Obtaining high-performance, steady-state, long-pulse plasma regime remains critical issue. Recently, big breakthrough in steady-state operation was made on Experimental Advanced Superconducting (EAST). A with world-record pulse length 1056 s obtained, where density divertor peak heat flux...
Based upon an over-one-month frequency comparison of two $^{40}{\mathrm{Ca}}^{+}$ optical clocks, the difference between clocks is measured to be $3.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$ with a measurement uncertainty $5.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$, considering both statistic ($1.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$) and systematic ($5.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$) uncertainties. This...
We present a liquid-nitrogen-cooled $\mathrm{Ca}$${}^{+}$ optical clock with an overall systematic uncertainty of $3.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$. In contrast to the room-temperature that we have reported previously, cryogenic black-body radiation (BBR) shield in vacuum is cooled $82\ifmmode\pm\else\textpm\fi{}5$ K using liquid nitrogen. also implement ion trap reduced heating rate and improved laser cooling. This allows temperature fall Doppler-cooling limit...
We report a frequency measurement of the clock transition single ^40Ca^+ ion trapped and laser cooled in miniature ring Paul trap with 10^-15 level uncertainty. In measurement, we used an optical comb referenced to Hydrogen maser, which was calibrated SI second through Global Positioning System (GPS). Two rounds measurements were taken May June 2011, respectively. The measured be 411 042 129 776 393.0(1.6) Hz fractional uncertainty 3.9{\times}10^-15 total averaging time > 2{\times}10^6 s...
The first equilibrium reconstruction of EAST current-density profile based on internal Faraday rotation measurements provided by the POlarimeter-INTerferometer (POINT) diagnostic is demonstrated using EFIT code. incorporates 11 simultaneous line-integrated density and effect from POINT to self-consistently reconstruct toroidal current a algorithm. It shown that can be applied improve accuracy core plasma q EAST. Comparisons magnetic surfaces reconstructed external data against those are...
We present a robust, transportable ${\mathrm{Ca}}^{+}$ optical clock, with systematic uncertainty of $1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$ limited by the black-body radiation (BBR) field evaluation and an uptime rate $>75%$ over 20-day period. The clock is then installed in air-conditioned car trailer, making it more convenient for applications. Referenced to stationary laboratory geopotential measurements are made total 0.33 m (statistically 0.25 systematically 0.22...
We demonstrate experimentally the existence of magic wavelengths and determine ratio oscillator strengths for a single trapped ion. For first time, two near 396 nm ${^{40}\mathrm{Ca}}^{+}$ clock transition are measured simultaneously with high precision. By tuning applied laser to an intermediate wavelength between transitions $4{s}_{1/2}\ensuremath{\rightarrow}4{p}_{1/2}$ $4{s}_{1/2}\ensuremath{\rightarrow}4{p}_{3/2}$, sensitivity Stark shift is greatly enhanced. Furthermore, wavelengths,...
We recently reported a $^{40}{\mathrm{Ca}}^{+}$ optical clock comparison with an uncertainty at $5.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$, mainly limited by the excess micromotion shift. Here we report progress made to reduce this shift and its below $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ precise measurement of ``magic'' rf drive frequency ${\mathrm{\ensuremath{\Omega}}}_{0}$ which micromotion-induced scalar Stark second-order Doppler cancel each...
We present the compact long-term nearly continuous operation of a room-temperature ${\mathrm{Ca}}^{+}$-optical-clock setup towards transportable clock, achieving an overall systematic uncertainty 4.8 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}18}$ and uptime rate 97.8% over 8-day period. The active liquid-cooling scheme is adopted, combined with precise temperature measurement 13 sensors both inside outside vacuum chamber to ensure accurate evaluation thermal environment for...
We investigate the $2^{3}{S}_{1}--2^{3}{P}_{J}$ ($J=0$, 1, 2) transitions in $^{6}{\mathrm{Li}}^{+}$ using optical Ramsey technique and achieve most precise values of hyperfine splittings $2^{3}{S}_{1}$ $2^{3}{P}_{J}$ states, with smallest uncertainty about 10 kHz. The present results reduce uncertainties previous experiments by a factor 5 for state 50 are better agreement theoretical values. Combining our measured intervals latest quantum electrodynamic (QED) calculations, improved Zemach...
In this study, we trained various pretrained convolutional neural networks to classify Chest X-Ray images. The training dataset consisted of 65 images obtained from clinical treatment and classified by expert radiologists. objective was differentiate between patients suitable for hyperbaric oxygen therapy those who are not. network architectures employed included GoogLeNet, ResNet, VGGNet. Optimal demonstrated that all models achieved 100% accuracy on the validation dataset. Results Grad...
This paper presents an automated method for solving the initial structure of compact, high-zoom-ratio mid-wave infrared (MWIR) zoom lenses. Using differential analysis, focal length variation process lenses under paraxial conditions is investigated, and a model power distribution relative motion three movable lens groups established. The particle swarm optimization (PSO) algorithm introduced into zooming program developed in MATLAB to solve structure. integrates physical constraints from...
As one of the most accurate instruments in history, optical clock will be used as measuring equipment for next generation seconds. The demand miniaturization is progressively urgent. In this paper, a multi-channel radio frequency module with 20% volume commercial designed and implemented transportable 40Ca+ ion clock. Based on double crystal oscillator interlocking technique，1 GHz low-phase noise reference source developed direct digital synthesis. By simulation optimization signal link...
Carbon monoxide (CO) is both a potent poison for many aerobic organisms and desirable energy source diverse microorganisms. Atmospheric emissions of this gas have increased since industrialization their levels are highly elevated in urban natural environments; however, it unresolved whether CO at environmentally relevant concentrations primarily stimulatory or inhibitory to soil microbial communities. Here, we showed that exposure minimally affects abundance, richness, composition ecosystem...
The paper proposes a model based on receptive field enhancement and cross-scale fusion (RFCS-YOLO). It addresses challenges like complex backgrounds problems of missing mis-detecting traffic targets in bad weather. First, an efficient feature extraction module (EFEM) is created. reconfigures the backbone network. This helps to make better improves its ability extract features at different scales. Next, (CSF) introduced. uses coordinate attention mechanism (RFCA) fuse information from scales...
As one of the most precise timekeeping instruments ever developed, optical clock will be used as measuring equipment for next generation second definition. The demand miniaturization clocks is progressively urgent. In this paper, a multi-channel radio frequency (RF) module with 20% volume commercial designed and implemented transportable 40Ca+ ion clock. Based on double-crystal oscillator interlocking technique, 1 GHz low-phase noise reference source developed direct digital synthesis....
As a specific genre of art song, Formed in the late 18th and early 19th centuries, Chinese composers began 20th century, In process writing songs, Not only using advanced composition techniques foreign Also pay attention to combination with traditional culture nation, Gradually explore road artistic song creation characteristics reflecting national character, So that songs 20s 1940s ushered their first brilliant development period; This paper selects this topic for research, Exploring...
The traditional trial-and-error approach, although effective, is inefficient for optimizing rubber composites. latest developments in machine learning (ML)-assisted methodologies are also not suitable predicting and composite properties. This due to the dependency of properties on processing conditions, which prevents alignment data collected from different sources. In this work, a novel workflow called ML-enhanced approach proposed. integrates orthogonal experimental design with symbolic...
In the first year of Republic China, during period Mr. Youth master staying in Germany, his musical accomplishment was greatly improved. Although he did not specifically study music, also learned many other Musical Instruments, especially music theory and composition. Influenced by Schubert others, works have western characteristics. He is good at combination Chinese Western songwriting, characteristics thought, which more inclined to expressionism.
Abstract JOREK 3D non-linear magnetohydrodynamic (MHD) simulations with non-equilibrium impurity treatment of thermal quench (TQ) triggered by a massive neon gas in EAST L-mode disruptions are first presented. Neon impurities deposited at Ψ N ~ 0.7, followed asymmetrical parallel extension along magnetic lines driven self-consistent electrical field induced plasma cooling process. Both double-stage and single-stage TQ observed experiments reproduced through varying particle fluxes. In TQ,...