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1,912 results on '"Song Chao"'

1. Understanding the characteristics of loess strata and quaternary climate changes in Luochuan, Shaanxi Province, China, through core analysis

Author

Guo Jiao, Shi Jiansheng, Song Chao, Dong Qiuyao, and Wang Wei

Subjects
paleoclimate, loess characteristics, paleomagnetism, magnetic susceptibility, particle size, loss on ignition, Geology, QE1-996.5
Abstract

Profile sampling, which causes missing or overlapping horizons, has been generally used while studying loess stratigraphy and paleoclimate. Conversely, drill sampling of thick loess can provide a relatively complete and actual record of the Quaternary climate and environmental changes. Here, paleomagnetic chronological analysis and particle size and magnetic susceptibility analyses were performed to accurately reveal the loess stratigraphy characteristics of Luochuan loess tableland in Fu County, Shaanxi Province, China. The FX core revealed that the Quaternary loess layer was 167.03 m thick and consisted of 33 layers of developed loess/paleosol sequences and 37 loess/paleosol assemblages. The paleosol horizons indicated relatively warm and humid climatic period, while loess/sand reflected cold and arid climate. Since 2.6 Ma, the climate of the region has undergone 37 warm and cold cycles trending toward an increasingly dry and cold climate. During this time, 10 paleoclimate cycles occurred during 2.6–1.6 Ma, 15 climate cycles occurred during 1.6–0.8 Ma, and 12 loess–paleosol cycles have occurred from 0.8 Ma to the present day. Our study provides a basis for accurately and comprehensively interpreting the paleoclimate and paleoenvironment during loess deposition formation.

Published
2023
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2. Inverse design of aerodynamic configuration using generative topographic mapping

Author

SONG Chao, LIU Hongyang, ZHOU Zhu, LUO Xiao, and LI Weibin

Subjects
反设计, 生成拓扑映射, 机器学习, 遗传算法, 压力分布, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

The inverse design method of aerodynamic configuration is hard to give a reasonable pressure distribution, and strongly rely on experience of designers. The method has been difficult to adapt to the needs of modern aircraft design. Aiming at the shortcoming of the method, an efficient and robust aerodynamic configuration inverse design method is developed, employing knowledge of machine learning methods and optimization methods. The present method establishes the mapping between the high dimensional data obtained from aerodynamic shape and pressure distribution and the variables in the latent space. Then, the global optimization is carried out in the latent space by using the genetic algorithm. The optimum pressure distribution and the corresponding shape can be obtained. Through the the GTM model with high precision, there is not necessary for the flow solver in the whole iterative process, thus the design efficiency can be enhanced. Besides, by taking the advantage of optimization method, the target pressure distribution can be given in a very flexible way, and does not need to be physically meaningful. This feature can reduce reliance on the design experience. Airfoils in low speed and transonic flow and a three-dimensional laminar nacelle design cases are carried out. It is shown that the method robustly and efficiently converges to the target pressure, and has good engineering application potential.

Published
2022
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3. Post-endovascular aortic repair syndrome: risk factor analysis of endovascular aneurysm repair

Author

LIAN Shilin, WU Mengtao, HU Wenping, SONG Chao, and LU Qingsheng

Subjects
endovascular aneurysm repair, early postoperative adverse events, Medicine (General), R5-920
Abstract

Objective To investigate the risk factors for early postoperative adverse events (EPAE) after endovascular aneurysm repair (EVAR). Methods A total of 2 193 cases of aortic aneurysm treated in Changhai Hospitaly from 1997 to 2014 were analyzed retrospectively. The perioperative hematological variables in relation to EPAE after EVAR were analyzed. Results The rate of EPAE was 20.8%. Multivariate analysis showed postoperative white cell count (OR=1.24, 95% CI: 1.06-1.16, P=0.08), hemoglobin level (OR=0.87, 95%CI: 0.83-0.92, P < 0.01), and platelet level (OR=0.99, 95% CI: 0.98-1.00, P=0.029) to be independent factors associated with the EPAE. Conclusion Increased white cell count and decreased hemoglobin and platelet levels are independent risk factors for EPAE.

Published
2019
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4. Enhanced quantum state transfer: Circumventing quantum chaotic behavior

Author

Xiang, Liang, Chen, Jiachen, Zhu, Zitian, Song, Zixuan, Bao, Zehang, Zhu, Xuhao, Jin, Feitong, Wang, Ke, Xu, Shibo, Zou, Yiren, Li, Hekang, Wang, Zhen, Song, Chao, Yue, Alexander, Partridge, Justine, Guo, Qiujiang, Mondaini, Rubem, Wang, H., and Scalettar, Richard T.

Subjects
Quantum Physics, Condensed Matter - Superconductivity
Abstract

The ability to realize high-fidelity quantum communication is one of the many facets required to build generic quantum computing devices. In addition to quantum processing, sensing, and storage, transferring the resulting quantum states demands a careful design that finds no parallel in classical communication. Existing experimental demonstrations of quantum information transfer in solid-state quantum systems are largely confined to small chains with few qubits, often relying upon non-generic schemes. Here, by using a large-scale superconducting quantum circuit featuring thirty-six tunable qubits, accompanied by general optimization procedures deeply rooted in overcoming quantum chaotic behavior, we demonstrate a scalable protocol for transferring few-particle quantum states in a two-dimensional quantum network. These include single-qubit excitation and also two-qubit entangled states, and two excitations for which many-body effects are present. Our approach, combined with the quantum circuit's versatility, paves the way to short-distance quantum communication for connecting distributed quantum processors or registers, even if hampered by inherent imperfections in actual quantum devices., Comment: 10 pages, 4 figures (main text); 14 pages, 20 figures (supplementary materials)

Published
2024
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6. Localization Improvement for Bearing Units on Key Parts of Morgan RSM

Author

Shao Guangjun, Kang Shaobo, Yu Shui, Kong Xiangzhuo, Wu Qiao, and Song Chao

Subjects
RSM, Reliability, Localization, Mechanical engineering and machinery, TJ1-1570
Abstract

Morgan RSM has been pervasive applicated on high speed wire rod production for its compact-sized,high quality products,high productivity,and so on. The speed ratio with different manufacturing technique requirements can be combined by adjusting 9 clutches. The gears used in which,worked with tapered roller bearings with pre-tightening force. The reliability of the equipment would be seriously reduced by off-gear caused by the abrasion of bearings under the working condition. A localization improvement on rolling bearing units of RSM on high speed wire rod production is described,which would be available for similar project.

Published
2018
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24. Observation of many-body Fock space dynamics in two dimensions

Author

Yao, Yunyan, Xiang, Liang, Guo, Zexian, Bao, Zehang, Yang, Yong-Feng, Song, Zixuan, Shi, Haohai, Zhu, Xuhao, Jin, Feitong, Chen, Jiachen, Xu, Shibo, Zhu, Zitian, Shen, Fanhao, Wang, Ning, Zhang, Chuanyu, Wu, Yaozu, Zou, Yiren, Zhang, Pengfei, Li, Hekang, Wang, Zhen, Song, Chao, Cheng, Chen, Mondaini, Rubem, Wang, H., You, J. Q., Zhu, Shi-Yao, Ying, Lei, and Guo, Qiujiang

Subjects
Quantum Physics, Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Statistical Mechanics, Condensed Matter - Strongly Correlated Electrons
Abstract

Quantum many-body simulation provides a straightforward way to understand fundamental physics and connect with quantum information applications. However, suffering from exponentially growing Hilbert space size, characterization in terms of few-body probes in real space is often insufficient to tackle challenging problems such as quantum critical behavior and many-body localization (MBL) in higher dimensions. Here, we experimentally employ a new paradigm on a superconducting quantum processor, exploring such elusive questions from a Fock space view: mapping the many-body system onto an unconventional Anderson model on a complex Fock space network of many-body states. By observing the wave packet propagating in Fock space and the emergence of a statistical ergodic ensemble, we reveal a fresh picture for characterizing representative many-body dynamics: thermalization, localization, and scarring. In addition, we observe a quantum critical regime of anomalously enhanced wave packet width and deduce a critical point from the maximum wave packet fluctuations, which lend support for the two-dimensional MBL transition in finite-sized systems. Our work unveils a new perspective of exploring many-body physics in Fock space, demonstrating its practical applications on contentious MBL aspects such as criticality and dimensionality. Moreover, the entire protocol is universal and scalable, paving the way to finally solve a broader range of controversial many-body problems on future larger quantum devices., Comment: 8 pages, 4 figures + supplementary information

Published
2022
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25. Data-Fusion-Based Detect Equipment of Tank Initiative Defense System

Author

Song Chao, Yao Liu, and Xiao Ziqiang

Subjects
The tank initiative defence system, Data-fusion technology, Engineering (General). Civil engineering (General), TA1-2040
Abstract

With change of the battlefield and the development of armor technology, the detect ability of the tank initiative defense system meets a huge challenge. And the multi-sensor application can improve the detect ability of the detect equipment. But the different type data of different sensor cannot be dealt with by the processor until use the data-fusion technology to the different type data. Finally, the detect equipment with multi-sensor can improve the anti-jamming ability of the tank initiative defense system.

Published
2018
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26. Coherent control of quantum topological states of light in Fock-state lattices

Author

Deng, Jinfeng, Dong, Hang, Zhang, Chuanyu, Wu, Yaozu, Yuan, Jiale, Zhu, Xuhao, Jin, Feitong, Li, Hekang, Wang, Zhen, Cai, Han, Song, Chao, Wang, H., You, J. Q., and Wang, Da-Wei

Subjects
Quantum Physics, Physics - Atomic Physics, Physics - Optics
Abstract

Topological photonics provides a novel platform to explore topological physics beyond traditional electronic materials and stimulates promising applications in topologically protected light transport and lasers. Classical degrees of freedom such as polarizations and wavevectors are routinely used to synthesize topological light modes. Beyond the classical regime, inherent quantum nature of light gives birth to a wealth of fundamentally distinct topological states, which offer topological protection in quantum information processing. Here we implement such experiments on topological states of quantized light in a superconducting circuit, on which three resonators are tunably coupled to a gmon qubit. We construct one and two-dimensional Fock-state lattices where topological transport of zero-energy states, strain induced pseudo-Landau levels, valley Hall effect and Haldane chiral edge currents are demonstrated. Our study extends the topological states of light to the quantum regime, bridges topological phases of condensed matter physics with circuit quantum electrodynamics, and offers a new freedom in controlling the quantum states of multiple resonators., Comment: 9 pages, 6 figures

Published
2022
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32. Observation of many-body Fock space dynamics in two dimensions

Author

Yao, Yunyan, Xiang, Liang, Guo, Zexian, Bao, Zehang, Yang, Yong-Feng, Song, Zixuan, Shi, Haohai, Zhu, Xuhao, Jin, Feitong, Chen, Jiachen, Xu, Shibo, Zhu, Zitian, Shen, Fanhao, Wang, Ning, Zhang, Chuanyu, Wu, Yaozu, Zou, Yiren, Zhang, Pengfei, Li, Hekang, Wang, Zhen, Song, Chao, Cheng, Chen, Mondaini, Rubem, Wang, H., You, J. Q., Zhu, Shi-Yao, Ying, Lei, and Guo, Qiujiang

Published
2023
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