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21st Asia simulation Conference, AsiaSim 2022

作者： Hao, Kaizi Du, Jian Ma, Jing Zhang, Ying Ma, Yiyuan Wan, Chen Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China North University of China Taiyuan030051 China

ISBN: (纸本)9789811991974

In this paper, the defect mode of one-dimensional photonic crystal was studied. For photonic crystal with one defect layer, the effects of refractive index and thickness of defect layer, photon period number and incident angle on defect mode were discussed. Photonic crystal structure with multiple defect layers was constructed, and multiple defect modes were obtained in the forbidden band. Based on the photonic crystal structure with two defect layers, a dual-channel narrow-band filter operating at 480 nm and 532 nm was designed. Particle swarm optimization algorithm was introduced to optimize the position and transmittance of defect modes, which mainly depended on the thickness of defect layer. The calculation results showed that the transmittance of the two defect modes reached 97.52% and 97.55%, respectively, while the full width at half maximum was only 1.0 nm and 1.8 nm. The simulation of the electric field distribution further proved the correctness of the design results. The research results had important value in the field of underwater laser communication. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Photonic crystals

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The Chang’E-6 Landing Region: Geologic Context, Mare Basalt, and Regolith Properties

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Journal of Geophysical Research: Planets 2025年第5期130卷

作者： Jia, Bojun Fa, Wenzhe Zhang, Mingwei Institute of Remote Sensing and Geographical Information System School of Earth and Space Sciences Peking University Beijing China State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Macao

Chang’E-6 (CE-6) is the first lunar farside sample-return mission. It landed in an Eratosthenian mare basalt unit within the South Pole-Aitken basin (SPA) and returned 1,935.3 g samples. These returned samples can address a wide range of fundamental questions about the Moon, including the nature of farside volcanism and mantle, the stratigraphy and evolution of the SPA terrain, the impact flux, chronology, and space weathering process of the lunar farside. This study investigates the geological context, mare basalt, and regolith properties of the CE-6 landing region using multi-source remote sensing observations. The size and spatial distributions of the penetrating craters and buried craters reveal that the thickness of the surface Eratosthenian basalt in most regions ranges from (Formula presented.) 30–60 m, and a layer of Imbrian basalts with a thickness of (Formula presented.) 90–120 m lies beneath. Morphology and rock population of small fresh craters within a 3 km radius of the landing site indicate a 2–10 m thick regolith layer with a median thickness of (Formula presented.) 3 m. Combined analysis of infrared and radar observations suggests a finer regolith at the landing site, with fewer meter-scale rocks but more centimeter- to decimeter-scale rocks compared with Chang’E-5 landing site. The surface features in the mare unit suggest that the regolith at the landing site may contain exotic ejecta primarily from Chaffee S, Vavilov, Lovell, and White craters, potentially including SPA melt and mantle materials. These findings improve the understanding of volcanic activity and regolith evolution at the landing site, and further provide foundations for subsequent laboratory analysis of the returned samples. © 2025. American Geophysical Union. All Rights Reserved.

关键词： basalt thickness Chang'E-6 regolith properties regolith thickness rock abundance

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Innovative design of cassegrain solar concentrator system for indoor illumination utilizing chromatic aberration to filter out ultraviolet and infrared in sunlight

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Solar Energy 2009年第8期83卷 1115-1122页

作者： Whang, Allen Jong-Woei Chen, Yi-Yung Wu, Bo-Yi Photonics System Simulation Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology 43 Sec.4 Keelung Rd Taipei 106 Taiwan

Many applications and related studies of solar energy have been focused on guiding sunlight into the indoors for illumination purposes. To achieve this objective, one of the approaches is the use of a high efficiency solar concentrator based on cassegrain construction with sun tracking system. However, exposure to UV in sunlight has been proved to be hazardous to humans, and the heat content of IR degrades illumination quality. In order to solve the two problems, we develop an innovative cassegrain solar concentrator system utilizing the theory of chromatic aberration by a chromatic lens to reduce UV and IR. A dispersion model to consider the impact between the chromatic lens and a guiding fiber is also proposed. As a result, the system can filter out UV completely and reduce IR by half. Further, the chromaticity coordinates of collected light for illumination is almost equal to sunlight, and the color difference is so small that the two appear equal to the human eye. © 2009.

关键词： Solar concentrators

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Study on photoelectric anti-interference technology of Optical Detecting system used in Surface-to-air Missiles 6

Study on photoelectric anti-interference technology of Optic...

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6th Conference on Frontiers in Optical Imaging and technology: Imaging Detection and Target Recognition

作者： Li-Qin, Zhang Lei, Chen Wei, Shen Jin-Dong, Fei Beijing Institute of Electronic System Engineering Peking100854 China Science and Technology on Special System Simulation Laboratory Peking100854 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

As the battlefield environment becomes more complex, optical guided weapons will face increasingly complex photoelectric interference environment. This paper analyzes the photoelectric interference and interference mode faced by the optical detection system used in surface-to-air missiles, also gives anti-interference methods and simulation results, aiming at providing reference for anti-interference design of surface-to-air missiles. © 2024 SPIE. All rights reserved.

关键词： Surface to air missiles

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Probabilistic robust control strategy for gust load alleviation 16

Probabilistic robust control strategy for gust load alleviat...

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16th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015

作者： Dai, Yuting Yang, Chao Wang, Chaolei School of Aeronautic Science and Engineering Beihang University Beijing100854 China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China

The aeroelastic model for a wing in the time domain is constructed with continuous wind gust and structural uncertainties. The H∞ optimal method and μ synthesis are applied to the robust control law design for gust load alleviation (GLA) problem. Specifically, with instability risk introduced in the uncertain model, the GLA factor can be largely increased. The instability probability for a uncertain system and nominal GLA factor are trade-off to get a higher performance and acceptable instability risk. At the same flow velocity, the stability robustness is decreased while the nominal gust load can be largely alleviated. Vise visa, though the nominal aeroelastic model is stable at all the velocities between 10 m/s to 30 m/s, the instability risk increased with the GLA factor ascending. Results indicate that with introducing a 0.2% instability risk, the nominal gust load can be alleviated by 24.5%.

关键词： Economic and social effects

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CIBER 4th flight fluctuation analysis: Pseudo-power spectrum formalism, improved source masking and validation on mocks

arXiv

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arXiv 2025年

作者： Feder, Richard M. Bock, James J. Cheng, Yun-Ting Cooray, Asantha Korngut, Phillip M. Matsuura, Shuji Nguyen, Chi H. Takimoto, Kohji Zemcov, Michael California Institute of Technology 1200 E California Blvd 91125 United States Berkeley Center for Cosmological Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics and Astronomy University of California IrvineCA92697 United States School of Science and Technology Kwansei Gakuin University Hyogo Sanda669-1337 Japan Department of Solar System Sciences Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Center for Detectors School of Physics and Astronomy Rochester Institute of Technology 1 Lomb Memorial Drive RochesterNY14623 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States

Precise, unbiased measurements of extragalactic background anisotropies require careful treatment of systematic effects in fluctuation-based, broad-band intensity mapping measurements. In this paper we detail improvements in methodology for the Cosmic Infrared Background ExpeRiment (CIBER), concentrating on flat field errors and source masking errors. In order to bypass the use of field differences, which mitigate flat field errors but reduce sensitivity, we characterize and correct for the flat field on pseudo-power spectra, which includes both additive and multiplicative biases. To more effectively mask point sources at 1.1 µm and 1.8 µm, we develop a technique for predicting masking catalogs that utilizes optical and NIR photometry through random forest regression. This allows us to mask over two Vega magnitudes deeper than the completeness limits of 2MASS alone, with errors in the shot noise power remaining below © 2025, CC BY.

关键词： Cosmology

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Tailoring conductive network Zn@NPC@MWCNTs nanocomposites derived from ZIF-8 as high-performance electromagnetic absorber for the whole X-Band

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Defence technology（防务技术） 2023年第5期23卷 189-200页

作者： Shi-bin Lu Ying Meng Hai-bo Wang Xian-wei Jiang Jin Yang Ning Wei Lin Jin Li-juan Wan Hao Tang Qian-qian Hou Anhui Province Key Laboratory of Simulation and Design for Electronic Information System Hefei Normal UniversityHefei230601PR China Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Hefei Normal UniversityHefei230601PR China

A porous 3D cross-linked conductive network pierced by multi-wall carbon nanotubes(MWCNTs) was successfully designed from zeolitic imidazolate framework-8(ZIF-8). Zn@NPC@MWCNTs composites were tailored by the facile regulating the mass ratios and thermal annealing treatment. Due to the combination of less eddy current loss and dielectric loss together with multiple reflection attenuation caused by a unique structure. With a 10 wt% filler loading, the Zn@NPC@MWCNTs composites carbonized at 800℃ show two high reflection loss(RL) values with different thicknesses. An RL value is-53.18 dB with 4.09 mm thickness in the C-Band(4-8 GHz), and a minimum RL can reach-74.83 d B(10.8 GHz)with a matching thickness of 2.749 mm. The effective absorption bandwidth is 4 GHz(from 8 to 12 GHz,RL ≤-10 d B), which just covers the full X-band. Low cost and easy preparation can also provide advantages to develop MOF-based materials as effective EMW absorbents.

关键词： ZIF-8 Electromagnetic wave absorption X-band C-Band

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Evaluation of precipitation forecasting base on GraphCast over mainland China

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Scientific Reports 2025年第1期15卷 1-13页

作者： Yan, Zihuang Lu, Xianghui Wu, Lifeng Liu, Fa Qiu, Rangjian Cui, Yaokui Ma, Xin School of Soil and Water Conservation Nanchang Institute of Technology Nanchang 330099 China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing 100038 China Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Water Resources Engineering and Management School of Water Resources and Hydropower Engineering Wuhan University Wuhan 430072 China Institute of RS and GIS School of Earth and Space Sciences Peking University Beijing 100871 China School of Mathematics and Physics Southwest University of Science and Technology Mianyang 621010 China

The accurate cumulative precipitation forecasts are essential for monitoring water resources and natural disasters. The combination of deep learning and big data has become a new direction for precipitation forecasting. However, the current large models are still lacking in-situ data verification. To accomplish this goal, the precipitation forecasting performance of a state-of-the-art model GraphCast was evaluated. Using the cumulative precipitation data from 2393 observation stations for the 1–3 day period as a reference, we assessed the cumulative precipitation in mainland China region for the 1–3 day period from 2020 to 2021, utilizing a high-resolution model with 0.25° × 0.25° grid spacing and 13 layers of parameters. The precipitation of European Centre for Medium-Range Weather Forecasts (ECMWF) was also compared. The results show that: (1) During the 2020-2021 period, for the 1-day, 2-day, and 3-day cumulative precipitation forecasts, the Root Mean Square Error (RMSE) values of GraphCast were primarily between 0.46 to 9.38 mm/d, 0.44 to 9.06 mm/d, and 0.44 to 9.06 mm/d, respectively. The Mean Error (ME) values were mainly between − 0.595 to 1.705 (0.01 mm). (2) As the forecast period extends, the forecasting capability of GraphCast declines. (3) In the 1–3 day cumulative precipitation forecasts for various stations in mainland China, GraphCast demonstrates higher predictive accuracy than ECMWF. (4) Compared to ECMWF, GraphCast demonstrated the best forecast performance in the temperate humid and semi-humid regions of Northeast China, with the RMSE being approximately 12 higher. Our study indicates that GraphCast demonstrates significant potential and higher accuracy in precipitation forecasting. © The Author(s) 2025.

关键词： Cumulative precipitation forecast ECMWF High resolution Large models

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Research on information capability based high-performance information sharing in the simulation grid

Research on information capability based high-performance in...

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2010 International Conference on Computer Modeling and simulation, ICCMS 2010

作者： Zhang, Ying-Chao Zhang, Jing Chen, Xin Yu, Qin-Zhang Zhang, Hao Beijing Institute of System Engineering National Key Laboratory of Science and Technology on Complex Systems Simulation Beijing China

ISBN: (纸本)9780769539416

For the purpose of achieving high-performance information sharing in the simulation grid, an information capability-based Three Phase High-performance Information Sharing Approach (TPHPISA for short) is advanced. The main idea of TPHPISA is selecting those information sources with highest information capability and executing the best query plan. To illustrate how TPHPISA works, an application example of implementing high-performance information sharing in the stock market simulation grid is thoroughly analyzed. At last, the searching efficiency and accuracy of TPHPISA are demonstrated through comparing with other similar method. © 2010 IEEE.

关键词： Information analysis

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Research on multi-agent based C4ISR effectiveness simulation and evaluation

Research on multi-agent based C4ISR effectiveness simulation...

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2010 International Conference on Computer Modeling and simulation, ICCMS 2010

作者： Zhang, Ying-Chao Feng, Ye Yu, Qin-Zhang Xin, Chen Beijing Institute of System Engineering National Key Laboratory of Science and Technology on Complex Systems Simulation Beijing China

ISBN: (纸本)9780769539416

The effectiveness evaluation of C4ISR is playing a more and more important role in its designing, developing and using. According to its characters, such as complexity and intelligence, the traditional evaluation methods and systems are not feasible and effective enough. In this paper, a multiagent based simulation and evaluation framework of C4ISR is advanced, which includes the architecture and the working procedure. The agent-based simulation model of C4ISR is put forward, according to which the C2 Agent, Armament Agent and the Evaluation Agent are founded. The interaction model between each agent is also designed. At final, based on the Swarm, a multi-agent based C4ISR effectiveness simulation and evaluation prototype is developed, through which NATO C2 effectiveness evaluation is thoroughly analyzed. © 2010 IEEE.

关键词： Multi agent systems

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