Chi Wang

National Space Science Center

Author Statistics

Papers

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i-10 index

Research Trends

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Document Type

Co-Authors

Lei Dai

National Space Science Center

Binbin Tang

National Space Science Center

Hui Li

University of Chinese Academy of Sciences

Tianran Sun

National Space Science Center

Xiaocheng Guo

National Space Science Center

Z. Liu

National Space Science Center

Jiyao Xu

National Space Science Center

J. L. Burch

Southwest Research Institute

J. D. Richardson

Massachusetts Institute of Technology

Wenya Li

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

1,053

University of Chinese Academy of Sciences

567

National Space Science Center

400

University of Science and Technology of China

289

Peking University

258

Zhejiang University

170

Institute of High Energy Physics

160

Memorial Sloan Kettering Cancer Center

154

Accreditation Council for Graduate Medical Education

146

Sun Yat-sen University

138

Author Statistics

Papers

Citation

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Research Field

Large Doppler Compensation for Mobile OFDM Based Underwater Acoustic Communication

Information Technology Journal (2013)

Jingwei Yin Chi Wang Zhengrong Pan

Underwater acoustic communication

Doppler frequency

10.3923/itj.2013.1429.1433

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Contemporary Anglo-Saxon documentary practice: an historical examination: Part 2

Brian Winston Chi Wang

[Part 2 of 3 Winston, Brian (2013) ‘当代英语世界的纪录片实践——一段历史考察’/‘Contemporary Anglo-Saxon Documentary Practice: An Historical Examination: Part 2’, 世界电影/World Cinema: 2013: 03. Beijing: China Film Press, pp. 180-188. 1002-9966/CN 11-2023/G2/2-473 ]

Documentary evidence

Anglo-Saxon

Source

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NLGR: Utilizing Neighbor Lists for Generative Rerank in Personalized Recommendation Systems

arXiv (Cornell University) (2025)

Shuli Wang Wei Xue S.Q. Kou Chi Wang Wenshuai Chen

Reranking plays a crucial role in modern multi-stage recommender systems by rearranging the initial ranking list. Due to the inherent challenges of combinatorial search spaces, some current research adopts an evaluator-generator paradigm, with a generator generating feasible sequences and an evaluator selecting the best sequence based on the estimated list utility. However, these methods still face two issues. Firstly, due to the goal inconsistency problem between the evaluator and generator, the generator tends to fit the local optimal solution of exposure distribution rather than combinatorial space optimization. Secondly, the strategy of generating target items one by one is difficult to achieve optimality because it ignores the information of subsequent items. To address these issues, we propose a utilizing Neighbor Lists model for Generative Reranking (NLGR), which aims to improve the performance of the generator in the combinatorial space. NLGR follows the evaluator-generator paradigm and improves the generator's training and generating methods. Specifically, we use neighbor lists in combination space to enhance the training process, making the generator perceive the relative scores and find the optimization direction. Furthermore, we propose a novel sampling-based non-autoregressive generation method, which allows the generator to jump flexibly from the current list to any neighbor list. Extensive experiments on public and industrial datasets validate NLGR's effectiveness and we have successfully deployed NLGR on the Meituan food delivery platform.

Generative model

10.1145/3701716.3715251

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SMILE: a mission to image the solar wind-magnetosphere interaction

C. P. Escoubet G. Branduardi‐Raymont Chi Wang

The interaction between the solar wind and the Earth's magnetosphere, and the geospace dynamics that result, is one of the key questions in space plasma physics. In situ instruments on a fleet of solar wind and magnetospheric constellation missions now provide the most detailed observations of Sun-Earth connections over multiple scales, from the smallest of a few kilometres up to the largest of a few 10s of Earth radii. However, we are still unable to quantify the global effects of the drivers of such connections, including the conditions that prevail throughout geospace. This information is the key missing link for developing a complete understanding of how the Sun gives rise to and controls Earth's plasma environment and space weather. This is where SMILE (Solar wind Magnetosphere Ionosphere Link Explorer) comes in.SMILE is a novel self-standing mission dedicated to observing the solar wind - magnetosphere coupling via simultaneous in situ solar wind/magnetosheath plasma and magnetic field measurements, soft X-ray imaging of the magnetosheath, magnetopause and polar cusps, and UV imaging of the northern hemisphere auroral oval. Remote sensing of the magnetosheath and cusps with soft X-ray imaging is made possible thanks to solar wind charge exchange (SWCX) X-ray emissions known to occur in the vicinity of the Earth's magnetosphere. SMILE is a joint mission between ESA and the Chinese Academy of Sciences (CAS) due for launch at the beginning of 2025. SMILE science objectives as well as the latest scientific and technical developments jointly undertaken by ESA and CAS and the international instrument teams will be presented.

Magnetosheath

Space physics

Space Weather

Polar wind

Magnetosphere of Jupiter

Magnetosphere of Saturn

10.5194/egusphere-egu23-12353

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Impact Pattern of Energetic Particle Precipitation on Polar Mesospheric Ozone

Journal of Geophysical Research Space Physics (2024)

Yuting Wang Hui Li Chi Wang

Abstract The upper atmosphere of polar regions exhibits two distinct patterns of energetic particle precipitation that can lead to ozone destruction by ionizing the atmosphere: one is the energetic proton precipitation in the polar cap region during solar proton events (SPEs), and the other is the energetic electron precipitations (EEPs) in the auroral oval region from the radiation belt. In this study, we conduct case studies and statistical analyses of ozone observations from the Aura satellite to present the quantitative difference in the impact patterns of SPEs and EEPs on polar mesospheric ozone. According to our statistical analysis of 13 SPEs and 19 EEPs during the MLS time frame, the magnitude of ozone depletion during SPEs is greater than during EEPs. The ozone depletion during SPEs is more pronounced at higher geomagnetic latitudes and negatively correlates with the proton flux, while during EEPs the ozone depletion is more in favor of the geomagnetic latitude band of 60–70° but independent of the electron count rates. In addition, hydroxyl enhancement also exhibits different patterns during SPEs and EEPs, similar to that of ozone depletion. This study further validates the physical link between the magnetosphere and atmosphere and promotes our understanding of the solar influence on Earth's climate.

Particle (ecology)

10.1029/2024ja032877

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946/1030 nm Dual-Wavelength Laguerre-Gaussian (LG01) Mode Vortex Laser Based on Intracavity Cascade Pumped Resonator

Photonics (2023)

Yashuai Yang Yongliang Li Chi Wang Chao Yang

In this paper, the 946/1030 nm dual-wavelength LG01 mode vortex laser is obtained by applying the intracavity cascade pumped structure and annular-beam end-pumped method, an innovative and pioneering exploration of the transverse mode of the dual-wavelength laser. First, we demonstrate the oscillation characteristic theoretical model of the dual-wavelength LG01 mode laser, considering the reabsorption effect. Then the length of the laser crystal and the transmittance of the output mirror are simulated and analyzed, respectively, related to the oscillation characteristics of the 946 and 1030 nm LG01 mode vortex lasers. Finally, a 946/1030 nm LG01 mode vortex laser with the same handedness is successfully achieved in our experiment. With 20 W of annular-beam pump power, the output power of 946 and 1030 nm LG01 mode vortex lasers is 0.404 and 0.510 W, the slope efficiency is 3.6% and 6.2%, and the total optical-optical conversion efficiency is 4.6%. At the maximum output power, the fluctuations of output power within 1 h are 4.02% and 4.23%, and the beam quality factors M2 are 2.32 and 2.27, respectively, for 946 and 1030 nm LG01 mode vortex lasers. The wavefront phase exp(iϕ) of the 946/1030 nm dual-wavelength is also proved by the self-interference method.

Output coupler

Slope efficiency

M squared

Laser linewidth

Transverse mode

10.3390/photonics10040441

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Dietary nano-Se supplementation regulates lipid deposition, protein synthesis and muscle fibre formation in grass carp fed with high-fat diet

British Journal Of Nutrition (2023)

Sha Liu Haibo Yu Lingwei Zhu Xiaotian Zhang Pengju Li

The current study aims to confirm the positive effects of dietary nano-Se on nutrients deposition and muscle fibre formation in grass carp fed with high-fat diet (HFD) before overwintering and to reveal its possible molecular mechanism. The lipid deposition, protein synthesis and muscle fibre formation in grass carp fed with regular diet (RD), HFD or HFD supplemented with nano-Se (0·3 or 0·6 mg/kg) for 60 d were tested. Results show that nano-Se significantly reduced lipid content, dripping loss and fibre diameter (P < 0·05), but increased protein content, post-mortem pH24 h and muscle fibre density (P < 0·05) in muscle of grass carp fed with HFD. Notably, dietary nano-Se decreased lipid deposition in the muscle by regulating amp-activated protein kinase activity and increased protein synthesis and fibre formation in muscle by activating target of rapamycin and myogenic determining factors pathways. In summary, dietary nano-Se can regulate the nutrients deposition and muscle fibre formation in grass carp fed with HFD, which exhibit potential benefit for improving flesh quality of grass carp fed with HFD.

Grass carp

Muscle protein

Flesh

Deposition

10.1017/s0007114523000892

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Citations (1)

Acoustic-vibration intelligent detection of flexible shallow buried objects

Optics and Precision Engineering (2024)

Chi Wang Peng Cao Qing Huang Chao Wang Cailiang SHENG

提出一种基于目标检测算法的柔性浅埋物的声-振智能探测方法,将声波激励、激光散斑干涉测振和目标检测算法有机结合,用以柔性浅埋物的大范围快速探测。在论述YOLO系列目标检测算法原理的基础上,选择并优化柔性浅埋物的智能探测网络模型;然后,搭建声-光融合智能探测系统,构建不同柔性浅埋物的激光散斑干涉条纹图数据集;最后,对数据集进行训练和测试,验证该算法用于干涉条纹图识别的可行性。实验结果表明:在给定实验条件下,柔性浅埋物智能探测网络模型的精确率为98.39%,召回率为84.72%,平均识别精度为99.66%。该声-振智能探测方法可以在给定实验环境下对多种柔性浅埋物的激光散斑干涉条纹图进行智能识别,适用于浅层地下柔性掩埋物的大面积快速探测。

10.37188/ope.20243205.0661

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Whistler Waves as a Signature of Converging Magnetic Holes in Space Plasmas

The Astrophysical Journal (2022)

Wence Jiang Daniel Verscharen Hui Li Chi Wang K. G. Klein

Abstract Magnetic holes are plasma structures that trap a large number of particles in a magnetic field that is weaker than the field in its surroundings. The unprecedented high time-resolution observations by NASA’s Magnetospheric Multiscale Mission enable us to study the particle dynamics in magnetic holes in the Earth’s magnetosheath in great detail. We reveal the local generation mechanism of whistler waves by a combination of Landau-resonant and cyclotron-resonant wave–particle interactions of electrons in response to the large-scale evolution of a magnetic hole. As the magnetic hole converges, a pair of counter-streaming electron beams form near the hole’s center as a consequence of the combined action of betatron and Fermi effects. The beams trigger the generation of slightly oblique whistler waves. Our conceptual prediction is supported by a remarkable agreement between our observations and numerical predictions from the Arbitrary Linear Plasma Solver. Our study shows that wave–particle interactions are fundamental to the evolution of magnetic holes in space and astrophysical plasmas.

Whistler

Magnetosheath

Space physics

Astrophysical plasma

10.3847/1538-4357/ac7ce2

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Citations (8)

Proton temperatures in the ring current from ENA images and in situ measurements

Geophysical Research Letters (2005)

X.X. Zhang J. D. Perez T. Chen Chi Wang P. C. Brandt

Ion equatorial flux distributions, inverted from energetic neutral atom (ENA) images in different energy channels obtained by the HENA imager on the IMAGE satellite, are used to deduce the plasma ion temperature in the ring current. During the early period of the recovery phase of the strong storm on 12 August 2000, the deduced ion temperatures of the ring current are consistent with the values inferred from in situ LANL MPA measurements. The ion temperatures show a peak in the post‐midnight/pre‐dawn sector coincident with the peak in the equatorial ion distributions. The temperature, however, is more symmetrical than the ion flux implying that, at least in this part of the energy spectrum, the density variations make the major contribution to pressure gradients.

Ring current

10.1029/2005gl023481

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Citations (18)