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Acta Oceanologica Sinica 2022年第7期41卷 78-83页

作者： ke qu Binbin Zou Jianbo Zhou College of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiang524088China Shanghai Acoustics Laboratory Chinese Academy of SciencesShanghai201815China School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China

Complex perturbations in the profile and the sparsity of samples often limit the validity of rapid environmental assessment(REA)in the South China Sea(SCS).In this paper,the remote sensing data were used to estimate sound speed profile(SSP)with the self-organizing map(SOM)method in the ***,the consistency of the empirical orthogonal functions was examined by using k-means *** clustering results indicated that SSPs in the SCS have a similar perturbation nature,which means the inverted grid could be expanded to the entire SCS to deal with the problem of sparsity of the samples without statistical ***,a machine learning method was proposed that took advantage of the topological structure of SOM to significantly improve their *** revealed promising results,with a mean reconstruction error of 1.26 m/s,which is 1.16 m/s smaller than the traditional single empirical orthogonal function regression(sEOF-r)*** violating the constraints of linear inversion,the topological structure of the SOM method showed a smaller error and better robustness in the SSP *** improvements to enhance the accuracy and robustness of REA in the SCS were *** results suggested a potential utilization of REA in the SCS based on satellite data and provided a new approach for SSP estimation derived from sea surface data.

关键词： South China Sea sound speed profile empirical orthogonal function self-organizing maps

A novel method for internal wave monitoring based on expansion of the sound speed profile

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Acta Oceanologica Sinica 2019年第4期38卷 183-189页

作者： ke qu Fengqin Zhu Wenhua Song Guangdong Province key Laboratory for Coastal Ocean Variation and Disaster Prediction Guangdong Ocean University College of Electronics and Information Engineering Guangdong Ocean University College of Information Science and Engineering Ocean University of China

For acoustic detection of internal waves, the core issue is to obtain the temporal and spatial distribution of the sound speed profile(SSP). In the inversion process, the SSP is usually expressed by a few parameters through expansion. However, information about internal waves may sometimes be hard to read directly from the inversion results. The aim of this paper is to characterize the internal waves directly though expansion coefficients. By deducing the dynamic equations of the internal waves, an orthogonal basis called the hydrodynamic normal modes(HNMs) can be extracted from a certain number of SSP samples. Unlike the existing widely used empirical orthogonal functions(EOFs), the HNMs have a more explicit physical meaning that is directly related to internal wave activity. The HNMs are then used to expand the SSP time series, and the expansion coefficients are ***, information about internal waves can be read directly from the time derivative of the expansion coefficients of the first two modes. In this study, this method is applied to thermistor string profiles from the northern shelf of the South China Sea, where the SSP shows evident spatial and temporal variations due to internal waves. The results show that the SSP can be described approximately by the first two modes with adequate precision. The special oscillation structure of the time derivative of the expansion coefficients can be used to detect internal solitary waves. The expansion coefficients can also give information on internal solitary wave amplitude and width. According to theoretical and experimental analysis, it can be concluded that the internal waves monitoring method introduced in this paper is effective. The HNMs method is simple to apply and depends less on sample data than EOFs. It could be used as an efficient alternative to EOFs to expand the use of the SSP in highly variable areas, where internal waves are intensive.

关键词： internal waves hydrodynamic normal modes internal solitary waves South China Sea

Engineering Geological Assessment for Route Selection of Railway Line in Geologically Active Area:A Case Study in China

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Journal of Mountain Science 2013年第4期10卷 495-508页

作者： HUANG Run-qiu LI Yan-rong qu ke WANG ke State key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology AGECON Ltd. The Second Survey and Design Institute of China Railways

The Cheng-Lan railway links Chengdu, a central city in Southwestern China, and Lanzhou, a central city in Northwestern China. The railway passes through the Longmenshan fault zone (Wenchuan earthquake happened there on May 12, 2008), Minjiang fault zone, and Dongkunlun fault zone, which are all active. It runs over the Yangtze River and the Yellow River, and crosses high mountains and deep valleys. There exists, along the railway's alignment, different kinds of strata of hard granite and soft, weak metamorphic rocks such as carbonaceous slate, schist, and phyllite. It is, therefore, a key issue for such an infrastructure construction to assess the engineering geological conditions and risks, so as to mitigate or avoid possible georisks and to offer optional designs. Geological survey and georisk assessment along the railway corridor are carried out. Special attention is given to active faults, earthquakes and seismic zones. Based on these, discussions about geological aspects for route selection of the railway are conducted and countermeasures for georisk control are proposed accordingly. Main conclusions are achieved as follows: (1) Geohazards such as landslides, rockfalls and debries flows dominate both the route selection of the railway and the engineering structures (e.g., tunnels or bridges) adopted; (2) Tunnel has been proved to be an excellent structure for linear engineering in geologically active area; and (3) In the case where avoiding is impractical, necessary protection measures should be taken to engineering slopes in high earthquake intensity areas, especially the area with earthquake of Ms. 8 or greater.

关键词： Railway route selection Geologicallyactive area Earthquake Active fault

A Reflection on the 2017 Nobel Prize for Physiology and Chinese Medicine

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Chinese Journal of Integrative Medicine 2020年第11期26卷 867-872页

作者： XING Meng qu ke-shen HUANG Yu XING Yu-rui Department of Dermatology Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghai(200437)China Department of Chinese Medicine Surgery Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai(200032)China Shaanxi University of Chinese Medicine Xi'an(712046)China

Research on the molecular mechanisms controlling circadian rhythm in Western medicine is comparable to the study of a day-night rhythm in Chinese medicine(CM),as also focus on the same life *** comparing the two,this paper elaborates on the differences between them in their respective issues of consciousness,ways of thinking,research methods and research *** speaking,Nobel Prize research has a stronger sense of the problems and concerns about the essence of“what”,while CM focuses on“how a thing functions”.The former mainly adopts experimental and mathematical methods,while the latter primarily depends on observation and *** natural philosophy and natural science eventually lead to the results and the inevitable,quantitative and qualitative *** on the life rhythm in CM should be proposed,scientific problems should be fully grasped,and research should be carried out with the aid of multidisciplinary new knowledge and new achievements through cross-disciplinary *** the basis of clinical epidemiological research and experimental research,a systematic review should be made of the human physiology of CM and the pathological rhythm model to explore the regulatory mechanism of time rhythm and create a new theory of time medicine.

关键词： Nobel Prize Chinese medicine contrast between Chinese medicine and Western medicine

Experimental and Numerical Investigation of Local Scour Around Submarine Piggyback Pipeline Under Steady Current

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Journal of Ocean University of China 2018年第2期17卷 244-256页

作者： ZHAO Enjin SHI Bing qu ke DONG Wenbin ZHANG Jing College of Engineering Ocean University of China College of Marine Science and Technology China University of GeosciencesWuhan School of Hydraulic Engineering Changsha University of Science & Technology Department of Civil Engineering City College The City University of New York College of Water Resources and Civil Engineering Shandong Agricultural University

As a new type of submarine pipeline, the piggyback pipeline has been gradually adopted in engineering practice to enhance the performance and safety of submarine pipelines. However, limited simulation work and few experimental studies have been published on the scour around the piggyback pipeline under steady current. This study numerically and experimentally investigates the local scour of the piggyback pipe under steady current. The influence of prominent factors such as pipe diameter, inflow Reynolds number, and gap between the main and small pipes, on the maximum scour depth have been examined and discussed in detail. Furthermore, one formula to predict the maximum scour depth under the piggyback pipeline has been derived based on the theoretical analysis of scour equilibrium. The feasibility of the proposed formula has been effectively calibrated by both experimental data and numerical results. The findings drawn from this study are instructive in the future design and application of the piggyback pipeline.

关键词： piggyback pipeline local scour scour depth current volume of fluid experiment numerical simulation

Osiers-sprout-like heteroatom-doped carbon nanofibers as ultrastable anodes for lithium/sodium ion storage

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Nano Research 2018年第7期11卷 3791-3801页

作者： Hang Zhang Guanhua Zhang Zhiqin Li ke qu Huimin Shi Qingfeng Zhang Huigao Duan Jianhui Jiang College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China State key Laboratory of Advanced Design and Manufacturing for Vehicle Body National Engineering Research Center for High Efficiency Grinding College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA

We report an in situ carbothermic reduction process to prepare osiers-sprout-like heteroatom-doped carbon nanofibers. The dosage of copper salts and a unique annealing process have a crucial effect on the development of this unique carbon structure. A systematic analysis is performed to elucidate the possible mechanism of synthesis of the carbon nanofibers decorated with carbon bubbles. As anodes for rechargeable lithium/sodium ion batteries, the heteroatom-doped nanofibers exhibit high reversible capacities and satisfactory long-term cycling stabilities. The osiers-sprout-like heteroatom-doped carbon nanofiber electrodes deliver an ultrastable cycling performance with reversible capacities of 480 and 160 mAh·g^-1 for lithium-ion and sodium-ion batteries after 900 cycles at a current density of 800 mA·g^-1, respectively.

关键词： doped carbon nanofibers carbothermic reduction anodes lithium-ion batteries sodium-ion batteries

Numerical investigation of pollution transport and environmental improvement measures in a tidal bay based on a Lagrangian particle-tracking model

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Water Science and Engineering 2018年第1期11卷 23-38页

作者： En-jin Zhao Lin Mu ke qu Bing Shi Xing-yue Ren Chang-bo Jiang College of Marine Science and Technology China University of GeosciencesWuhan School of Hydraulic Engineering Changsha University of Science and Technology College of Engineering Ocean University of China College of Civil Engineering and Architecture Hainan University

In view of the severity of oceanic pollution, based on the finite volume coastal ocean model （FVCOM）, a Lagrangian particle-tracking model was used to numerically investigate the coastal pollution transport and water exchange capability in Tangdao Bay, in China. The severe pollution in the bay was numerically simulated by releasing and tracking particles inside it. The simulation results demonstrate that the water exchange capability in the bay is very low. Once the bay has suffered pollution, a long period will be required before the environment can purify itself. In order to eliminate or at least reduce the pollution level, environmental improvement measures have been proposed to enhance the seawater exchange capability and speed up the water purification inside the bay. The study findings presented in this paper are believed to be instructive and useful for future environmental policy makers and it is also anticip

关键词： Particle-tracking Water exchange capability Lagrangian system Coastal pollution Tangdao bay FVCOM

Optical scheme to demonstrate state-independent quantum contextuality

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Chinese Physics B 2022年第3期31卷 187-191页

作者： Ya-Ping He Deng-ke qu Lei Xiao Kun-Kun Wang Xiang Zhan Department of Physics Southeast UniversityNanjing 211189China Beijing Computational Science Research Center Beijing 100084China School of Physics and Materials Science Anhui UniversityHefei 230601China School of Science Nanjing University of Science and TechnologyNanjing 210094China MIIT key Laboratory of Semiconductor Microstructure and quantum Sensing Nanjing University of Science and TechnologyNanjing 210094China

The contradiction between classical and quantum physics can be identified through quantum contextuality, which does not need composite systems or spacelike separation. Contextuality is proven either by a logical contradiction between the noncontextuality hidden variable predictions and those of quantum mechanics or by the violation of noncontextual inequality. We propose an experimental scheme of state-independent contextual inequality derived from the Mermin proof of the Kochen–Specker(KS) theorem in eight-dimensional Hilbert space, which could be observed either in an individual system or in a composite system. We also show how to resolve the compatibility problems. Our scheme can be implemented in optical systems with current experiment techniques.

关键词： state-independent quantum contextuality optical systems

Observing suppressed polarization in flexible ferroelectric negative capacitance field effect transistors

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Journal of Materiomics 2024年第4期10卷 762-769页

作者： Chuanlai Ren Liyufen Dai Congbing Tan Guangtong Yuan ke qu Jinbin Wang Xiangli Zhong Mingqiang Huang Jiyan Dai Gaokuo Zhong Jiangyu Li Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055GuangdongChina Guangdong Provincial key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen518055GuangdongChina School of Materials Science and Engineering Xiangtan UniversityXiangtan411105HunanChina School of Physics and Electronics Hunan University of Science and TechnologyXiangtan411201HunanChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong999077China

Negative capacitance(NC)has the potential to enable low power microelectronics beyond the fundamental thermionic limit,and it has been theorized that the thermodynamically unstable NC of ferroelectrics can be stabilized by linear dielectric,making negative capacitance ferroelectric field effect transistors(NC-FeFET)***,the validity of NC as a physical concept for ferroelectrics remain contentious despite numerous theoretical and experimental investigations,and the intrinsic ferroelectric NC with suppressed polarization has not been demonstrated except locally at vortex *** NC-FeFET with subthreshold swing(SS)lower than 60 mV/dec limit has been reported,such device characteristics has not been directly connected to suppressed polarization at materials’level,and alternative mechanisms other than NC have also been *** we demonstrate stable sub-60 mV/dec SS with hysteresis free Isingle bondV in NC-FeFET based on SrTiO_(3)/Pb(Zr_(0.1)Ti_(0.9))O_(3)/SrTiO_(3) heterostructure,and observe its suppressed polarization at both macroscopic and microscopic *** intrinsic ferroelectric NC thus is experimentally confirmed and directly connected to NC-FeFET performance,and the mica-based device is also highly flexible and robust under cyclic bending as well as extended heating.

关键词： Negative capacitance field-effect transistors Ferroelectric Pulse laser deposition Mica

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双自由度子母管线涡激振动数值研究

哈尔滨工程大学学报 2021年第5期42卷 729-737页

作者：蒋昌波徐进屈科长沙理工大学水利工程学院湖南长沙410114 水沙科学与水灾害防治湖南省重点实验室湖南长沙410114 洞庭湖水环境治理与生态修复湖南省重点实验室湖南长沙410114

为了研究双自由度子母管线周围的绕流特征,本文采用高精度浸没边界方法模拟了不同布置条件下双自由度子母管线的涡激振动特性,探讨子母管线质量比、间距比、空隙比和角度对子母管线低雷诺数振动特性及水动力的影响。结果表明:随着子母... 详细信息

为了研究双自由度子母管线周围的绕流特征,本文采用高精度浸没边界方法模拟了不同布置条件下双自由度子母管线的涡激振动特性,探讨子母管线质量比、间距比、空隙比和角度对子母管线低雷诺数振动特性及水动力的影响。结果表明:随着子母管线的质量比和间距比的增大,管线涡激振动的最大振幅逐渐减小,发生锁定的区间也变窄。不同角度对子母管线涡激振动的抑制作用不同,子管与母管并列时对子母管线涡激振动的抑制作用更强。另外通过对流向和横向耦合振动的分析可发现,低质量比时流向振动对横向振动的振幅和频率影响较大,而高质量比时这种影响相对较小。

关键词：浸没边界方法子母管线双自由度涡激振动流固耦合锁定区间雷诺数数值模拟