Search

Your search keyword '"Chen, Rujia"' showing total 187 results
Start Over Author "Chen, Rujia"
187 results on '"Chen, Rujia"'

4. Research on Fast Cooperative Search of Cruise Missile Cluster via Correlation Location Error Pheromone

Author

Chen Rujia, Deng Yimin, Duan Haibin

Subjects
cruise missile, unmanned system cluster, cooperative search, ant pheromone, guidance and control, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

Cooperative search is a future development direction in the field of cruise missile multi-projectile control, and its research is helpful for cruise missile to adapt to the future battlefield intelligent operation requirements. To solve the problem of efficient target search of cruise missile cluster in the absence of prior environmental information, an improved pheromone fast collaborative search algorithm based on correlation location error is proposed, which selects elite individuals within the group to lead the search of cluster members. On the basis of this, this paper combines cross direction finding, position control, information fusion, autonomous grouping and other methods to build a specific implementation architecture suitable for cruise missile cluster. Through numerical simulation analysis and comparison, the architecture constructed in this paper can realize the location of cruise missile cluster to multiple unknown targets in the sea-skimming scenario, and the proposed enhanced pheromone search algorithm can improve the efficiency of collaborative search.

Published
2024
Full Text
View/download PDF

19. A de novo evolved gene contributes to rice grain shape difference between indica and japonica

Author

Chen, Rujia, Xiao, Ning, Lu, Yue, Tao, Tianyun, Huang, Qianfeng, Wang, Shuting, Wang, Zhichao, Chuan, Mingli, Bu, Qing, Lu, Zhou, Wang, Hanyao, Su, Yanze, Ji, Yi, Ding, Jianheng, Gharib, Ahmed, Liu, Huixin, Zhou, Yong, Tang, Shuzhu, Liang, Guohua, Zhang, Honggen, Yi, Chuandeng, Zheng, Xiaoming, Cheng, Zhukuan, Xu, Yang, Li, Pengcheng, Xu, Chenwu, Huang, Jinling, Li, Aihong, and Yang, Zefeng

Published
2023
Full Text
View/download PDF

20. Analysis of the Current Situation of Foreign Trade in Central and Western China - A Case Study of Dazhou

Author

Chen, Rujia, Appolloni, Andrea, Series Editor, Caracciolo, Francesco, Series Editor, Ding, Zhuoqi, Series Editor, Gogas, Periklis, Series Editor, Huang, Gordon, Series Editor, Nartea, Gilbert, Series Editor, Ngo, Thanh, Series Editor, Striełkowski, Wadim, Series Editor, Wang, Zhikai, editor, Wu, Qiujing, editor, Liu, Songsong, editor, Wang, Guoliang, editor, and Li, Jia, editor

Published
2023
Full Text
View/download PDF

38. Hierarchical Residual Attention Network for Musical Instrument Recognition Using Scaled Multi-Spectrogram.

Author

Chen, Rujia, Ghobakhlou, Akbar, and Narayanan, Ajit

Subjects
INFORMATION storage & retrieval systems, MUSICAL instruments, DEEP learning, FEATURE extraction, INFORMATION retrieval
Abstract

Featured Application: This proposed method could potentially be applied to musical instrument classification tasks, contributing to the organization and analysis of audio data where identifying instruments is required. This may be useful in research, music information retrieval systems, or other related applications. Musical instrument recognition is a relatively unexplored area of machine learning due to the need to analyze complex spatial–temporal audio features. Traditional methods using individual spectrograms, like STFT, Log-Mel, and MFCC, often miss the full range of features. Here, we propose a hierarchical residual attention network using a scaled combination of multiple spectrograms, including STFT, Log-Mel, MFCC, and CST features (Chroma, Spectral contrast, and Tonnetz), to create a comprehensive sound representation. This model enhances the focus on relevant spectrogram parts through attention mechanisms. Experimental results with the OpenMIC-2018 dataset show significant improvement in classification accuracy, especially with the "Magnified 1/4 Size" configuration. Future work will optimize CST feature scaling, explore advanced attention mechanisms, and apply the model to other audio tasks to assess its generalizability. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

39. Novel Yb, Ho: NLGW Laser Crystal with Temperature Self-Monitoring Capability Achieved through Local Ligand Distortion Design

Author

Chen, Rujia, Chang, Ming, Huo, Yuliang, Li, Xinying, Zuo, Chunyu, Zeng, Fanming, Li, Chun, Yang, Weiling, Liu, Lina, Lin, Hai, and Li, Shasha

Abstract

By introducing the sensitizing ion Yb3+into the host lattice, the local ligand structure was optimized, resulting in improved luminescence efficiency of the active ions and enhanced thermal properties of the host material. A novel laser crystal material with temperature monitoring capability, 8 at. % Yb3+and 1 at. % Ho3+: NaLa0.85Gd0.06(WO4)2, was successfully grown using the Czochralski method. X-ray rocking curve and Rietveld refinement analysis indicated that the grown crystal possesses high crystallinity and crystallizes in the I41/aspace group, with lattice parameters of a= b= 5.3232 Å, c= 11.6019 Å, and V= 328.7610 Å3. The optical properties were characterized using absorption and near-infrared emission spectra, and the Judd–Ofelt (J-O) parameters were calculated to provide a theoretical foundation for subsequent laser output. Compared to the 1 at. % Ho3+: NaLa0.93Gd0.06(WO4)2crystal, the introduction of the sensitizing ion Yb3+led to a slight distortion of the host lattice, as shown by Fourier infrared spectroscopy, which increased the vibration of Yb–O bonds, significantly enhancing the luminescence efficiency. In addition to studying the basic energy transfer mechanism leading to enhanced luminescence, the relationship between the electron structure and local ligand distortion is explained for the first time, and the energy transfer mechanism of Yb–Ho is explained from two aspects. The thermal properties of the grown 8 at. % Yb3+and 1 at. % Ho3+: NaLa0.85Gd0.06(WO4)2laser crystal was studied. In the temperature range of 300–800 K, the crystal exhibited a low thermal expansion coefficient (8.138 × 10–6K–1), indicating a higher likelihood of achieving excellent laser gain. Finally, the temperature sensing properties were investigated, showing a high Srvalue of 1.18% K–1at 303 K, suggesting that the prepared crystal not only has excellent self-detection capabilities but also holds great promise as an outstanding medium for 2 μm solid-state lasers.

Published
2025
Full Text
View/download PDF

41. Melatonin enhances metal oxide nanoparticles tolerance in rice seedlings through dual regulation of antioxidant defense and photosynthetic efficiency.

Author

Gharib, Ahmed, Su, Yanze, Zuo, Zhihao, Chen, Rujia, Wang, Hanyao, Tao, Tianyun, Chuan, Mingli, Bu, Qing, Luo, Yanmo, Li, Yaoqing, Wang, Shuting, Hua, Yu, Ji, Yi, Ding, Jianheng, Liu, Wei, He, Shuihua, Li, Pengcheng, Xu, Yang, Xu, Chenwu, and Lu, Yue

Subjects
GLUTATHIONE reductase, FLUORESCENCE quenching, METAL nanoparticles, SUPEROXIDE dismutase, METALLIC oxides, MELATONIN
Abstract

The growing utilization of metal oxide nanoparticles (MONPs) presents novel and potential hazards to plants. However, the impacts of MONPs on plants and the mechanisms underlying their tolerance to MONPs remain unclear. In this study, we demonstrated that both CuO and ZnO nanoparticles hindered plant growth and triggered oxidative damage in rice seedlings. The role of melatonin in rice tolerance to MONPs was elucidated through a comprehensive analysis of OsCOMT mutant and overexpression plants, which showed melatonin deficiency and sufficiency, respectively. Our results revealed that the melatonin‐deficient OsCOMT mutant plants exhibited hypersensitivity to MONPs, while the melatonin‐sufficient OsCOMT overexpression plants showed enhanced MONPs tolerance. Physiological assessments further indicated that melatonin counteracted rice oxidative damage triggered by MONPs by increasing the activities of antioxidative enzymes, including superoxide dismutase, peroxidase, catalase, and glutathione reductase. Moreover, melatonin was found to foster rice growth under MONP stress by positively regulating the maximum photochemical efficiency, reducing non‐photochemical fluorescence quenching, and promoting the biosynthesis of sucrose and starch. These findings not only highlight the hazardous effects of MONPs on plants, but also underscore the pivotal role of melatonin in bolstering plant resilience against MONPs. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

43. Garnet Structure-Activated Warm White Light Phosphors Ca3Al2Ge3O12: Dy3+, Eu3+ with Ultrahigh Thermal Stability and Tunable Luminescence

Author

Zhou, Lingbo, primary, Chen, Rujia, additional, Jiang, Xiliang, additional, Zhang, Tianqing, additional, Shi, Xueming, additional, Leng, Zhuang, additional, Yang, Yimin, additional, Zhang, Zhipeng, additional, Zuo, Chunyu, additional, Li, Chun, additional, Yang, Weiling, additional, Lin, Hai, additional, Liu, Lina, additional, Li, Shasha, additional, Zeng, Fanming, additional, and Su, Zhongmin, additional

Published
2024
Full Text
View/download PDF

50. A novel single-phase color tunable LiYGeO4:Dy3+, Eu3+ phosphor exhibiting warm white light and excellent thermal stability.

Author

Zuo, Chunyu, Chen, Rujia, Jiang, Xiliang, Leng, Zhuang, Yang, Yimin, Zhang, Zhipeng, Zhou, Lingbo, Li, Chun, Yang, Weiling, Lin, Hai, Liu, Lina, Li, Shasha, Zeng, Fanming, and Su, Zhongmin

Abstract

LiYGeO4 phosphors doped with Dy3+ and Eu3+ ions were synthesized using the solid phase method, and their color characteristics were adjustable. The bandgap value of LiYGeO4 calculated by diffuse reflection data is very close to the theoretical value of 3.669 eV, indicating that LiYGeO4 is an ideal candidate for doped rare earth activated ions. The analysis of the emission spectra and fluorescence attenuation curves of Dy3+ and Eu3+ co-doped LiYGeO4 phosphors revealed a clear energy transfer process: energy transfer from Dy3+ to Eu3+. Analysis of emission spectra and fluorescence attenuation curves revealed a transfer of energy from Dy3+ to Eu3+. This transfer mechanism is attributed to the dipole–dipole interactions. In addition, by constantly adjusting the doping levels of Dy3+ and Eu3+, a warm white phosphor with a color temperature of 3881 K was obtained. Finally, the emission intensity of the LiYGeO4:0.015Dy3+,0.02Eu3+ phosphor at 423 K was 86%, indicating that the phosphor has excellent thermal stability and 40% internal quantum efficiency, which proves the potential application of the LiYGeO4 phosphor in white light-emitting diodes (w-LEDs). [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results