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The effect of Typhoon Kalmaegi on the modal energy and period of internal waves near the Dongsha Islands(South China Sea)

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Acta Oceanologica Sinica 2023年第12期42卷 22-31页

作者： Rongwei Zhai Guiying Chen Chenjing shang Xiaodong shang Youren Zheng South China Sea Information Center of State Oceanic Administration Guangzhou 510310China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510315China Shenzhen Key Laboratory of Marine Bioresource and Eco-environmental Science College of Life Sciences and OceanographyShenzhen UniversityShenzhen 518060China

The influence of Typhoon Kalmaegi on internal waves near the Dongsha Islands in the northeastern South China Sea was investigated using mooring observation *** observed,for the first time,that the phenomenon of regular variation characteristics of the 14-d spring-neap cycle of diurnal internal tides(ITs)can be regulated by *** diurnal ITs lost the regular variation characteristics of the 14-d spring-neap cycle during the typhoon period owing to the weakening of diurnal coherent ITs,represented by O_(1)and K_(1),and the strengthening of diurnal incoherent *** of quantitative analysis showed that during the pre-typhoon period,timeaveraged modal kinetic energy(sum of Modes 1–5)of near-inertial internal waves(NIWs)and diurnal and semidiurnal ITs were 0.62 kJ/m^(2),5.66 kJ/m^(2),and 1.48 kJ/m^(2),***,during the typhoon period,the modal kinetic energy of NIWs increased 5.11 times,mainly due to the increase in high-mode kinetic *** the same time,the modal kinetic energy of diurnal and semidiurnal ITs was reduced by 68.9%and 20%,respectively,mainly due to the decrease in low-mode kinetic *** significantly reduced diurnal ITs during the typhoon period could be due to:(1)strong nonlinear interaction between diurnal ITs and NIWs,and(2)a higher proportion of high-mode diurnal ITs during the typhoon period,leading to more energy dissipation.

关键词： internal waves spring-neap cycle modal kinetic energy South China Sea

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EXPERIMENTAL INVESTIGATION OF INCEPTION CAVITATION IN LIQUIDSOLID TWO PHASE TURBULENT FLOW

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Journal of Hydrodynamics 1991年第4期3卷 118-122页

作者： Hong-qi, shang Inst of Hydraulic Research Henan China

The experimental investigation of inception cavitation of liquid-solid two phase turbulent flow has been carried out in a two dimensional hydraulic tunnel. The experimental result shows that the cavitation existing in the sediment laden flow is different from that in the clear water. We also found that the inception cavitation of sediment laden flow only has a weak relation with the shape of the experimental model in which the cavitation originated, yet it has direct relation with the density of sediment concentration in the flow and the diameter of the sediment particles and the distribution of particle sizes. The results given in the paper could be used for engineering designing and hydraulic machine making.

关键词： Flow of Fluids Sediment Transport Flow of Fluids Turbulent Flow of Fluids Two Phase Water Supply Tunnels Models

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Denoising Fault-Aware Wavelet Network:A Signal Processing Informed Neural Network for Fault Diagnosis

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 1-18页

作者： Zuogang shang Zhibin Zhao Ruqiang Yan The State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710049China

Deep learning(DL) is progressively popular as a viable alternative to traditional signal processing(SP) based methods for fault diagnosis. However, the lack of explainability makes DL-based fault diagnosis methods difficult to be trusted and understood by industrial users. In addition, the extraction of weak fault features from signals with heavy noise is imperative in industrial applications. To address these limitations, inspired by the Filterbank-Feature-Decision methodology, we propose a new Signal Processing Informed Neural Network(SPINN) framework by embedding SP knowledge into the DL model. As one of the practical implementations for SPINN, a denoising fault-aware wavelet network(DFAWNet) is developed, which consists of fused wavelet convolution(FWConv), dynamic hard thresholding(DHT),index-based soft filtering(ISF), and a classifier. Taking advantage of wavelet transform, FWConv extracts multiscale features while learning wavelet scales and selecting important wavelet bases automatically;DHT dynamically eliminates noise-related components via point-wise hard thresholding;inspired by index-based filtering, ISF optimizes and selects optimal filters for diagnostic feature extraction. It’s worth noting that SPINN may be readily applied to different deep learning networks by simply adding filterbank and feature modules in front. Experiments results demonstrate a significant diagnostic performance improvement over other explainable or denoising deep learning networks. The corresponding code is available at https://github. com/alber tszg/DFAWn et.

关键词： Signal processing Deep learning Explainable Denoising Fault diagnosis

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Efficient photocatalytic reduction of chromium(Ⅵ) using photoreduced graphene oxide as photocatalyst under visible light irradiation

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Journal of Materials Science & Technology 2021年第32期91卷 17-27页

作者： Mei Yu Jing shang Yu Kuang Department of Environment and Health State Key Joint Laboratory of Environmental Simulation and Pollution ControlCollege of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

Graphene oxide(GO),a new and promising material,has been widely used as a co-catalyst in photocatalytic reactions;however,its capacity as a sole photocatalyst has rarely been *** this study,ultraviolet(UV) light irradiation was used as a modification method to obtain reduced GO(rGO) *** samples were used as photocatalysts to examine their visible light photocatalytic activity toward hexavalent chromium(Cr(Ⅵ)) *** force microscopy(AFM),X-ray diffraction(XRD),UV-vis spectrophotometry,Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),and electron spin resonance(ESR) spectroscopy were applied to interpret the surface and structure changes with UV *** oxygen-containing functional groups(OFGs) on the GO surface were reduced to defective carbons andπ-conjugated C=C(sp^(2) domains) under UV light;this led to a decrease in the interlayer distance between GO sheets,GO fragmentation,and increased disorder on the GO *** restoration of sp^(2) domains led to a narrower band gap of GO,which favored the rGO excitation by visible light to generate electron-hole *** rGO pre-irradiated with UV for 1 h(rGO-1),possessing the highest defect density and electron generation efficiency,exhibited the best Cr(Ⅵ) reduction efficiency,which was about three times that of the GO sample;moreover,it outperformed most of the reported GO-based *** addition,low pH and the addition of citric acid as a hole scavenger could further improve the photocatalytic *** study proves that GO or rGO can be used as a sole photocatalyst under visible light to remove environmental pollutants such as heavy-metal ions,and it paves the way for the development of this kind of material and its UV-irradiation modification for further applications.

关键词： Graphene oxide Chromium(Ⅵ) Defect density UV-irradiation modification Photocatalytic reduction

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Evolution of gastrointestinal double contrast radiography in China:researches,application and popularization

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World Journal of Gastroenterology 1998年第3期4卷 17-21页

作者： shang Ke-Zhong Department of Radiology Shanghai Sixth People's Hospital Shanghai 200233 China Department of Radiology Shanghai Second Medical University Acad. Comm. Chinese Gastrointest. R. China Department of Radiology Shanghai Sixth People's Hospital Shanghai 200233 600 Yishan Rd China

ＥｖｏｌｕｔｉｏｎｏｆｇａｓｔｒｏｉｎｔｅｓｔｉｎａｌｄｏｕｂｌｅｃｏｎｔｒａｓｔｒａｄｉｏｇｒａｐｈｙｉｎＣｈｉｎａ：ｒｅｓｅａｒｃｈｅｓ，ａｐｐｌｉｃａｔｉｏｎａｎｄｐｏｐｕｌａｒｉｚａｔｉｏｎＳＨＡＮＧＫｅ－Ｚ... 详细信息

ＥｖｏｌｕｔｉｏｎｏｆｇａｓｔｒｏｉｎｔｅｓｔｉｎａｌｄｏｕｂｌｅｃｏｎｔｒａｓｔｒａｄｉｏｇｒａｐｈｙｉｎＣｈｉｎａ：ｒｅｓｅａｒｃｈｅｓ，ａｐｐｌｉｃａｔｉｏｎａｎｄｐｏｐｕｌａｒｉｚａｔｉｏｎＳＨＡＮＧＫｅ－Ｚｈｏｎｇｕｂｊｅｃｔｈｅａｄｉｎｇ...

关键词： gastrointestinal diseases/radiotherapy barium/diagnostic use contrast media

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Some Interesting Features for External Region of Spherical Symmetric Mass in New Theory of Gravitation VGM

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Communications in Theoretical Physics 2006年第5X期46卷 879-880页

作者： QIAN shang-Wu Physics Department Peking University Beijing 100871 China

This paper briefly discusses some interesting features for the external region of the spherical symmetric mass in the new theory of gravitation VGM, i.e. the theory of gravitation by considering the vector graviton field and the metric field, such as pseudo-singularity, curvature tensor, static limit, event horizon, and the radial motion of a particle. All these features are different from the corresponding features obtained from general relativity.

关键词： pseudo-singularity curvature tensor static limit event horizon radial motion of the particle

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Simulation of storage ring injection of HLS Ⅱ

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Nuclear Science and Techniques 2016年第1期27卷 1-4页

作者： Yuan-Yuan Wang Lei shang Feng-Lei shang Ye-Ming Lu National Synchrotron Radiation Laboratory University of Science and Technology of China

The Hefei light source(HLS) has been upgraded into HLS II, with increased brightness and stability. In this paper, the new injection system is described. Elegant program is used to simulate the particles motion in 6D phase space. In the process of tracking simulation of electrons, the system tolerances and magnet errors are introduced. Influences to the injection efficiency from beam injection deviation are studied. These provide important reference for realizing the Top-up injection.

关键词：合肥光源储存环空间模拟注入系统模拟过程注入效率 HLS 稳定性误差

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Cybersecurity Landscape on Remote State Estimation:A Comprehensive Review

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 851-865页

作者： Jing Zhou Jun shang Tongwen Chen the Department of Electrical and Computer Engineering University of AlbertaEdmonton AB T6G 1H9Canada the Department of Control Science and Engineering and shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China

Cyber-physical systems(CPSs)have emerged as an essential area of research in the last decade,providing a new paradigm for the integration of computational and physical units in modern control *** state estimation(RSE)is an indispensable functional module of ***,it has been demonstrated that malicious agents can manipulate data packets transmitted through unreliable channels of RSE,leading to severe estimation performance *** paper aims to present an overview of recent advances in cyber-attacks and defensive countermeasures,with a specific focus on integrity attacks against ***,two representative frameworks for the synthesis of optimal deception attacks with various performance metrics and stealthiness constraints are discussed,which provide a deeper insight into the vulnerabilities of ***,a detailed review of typical attack detection and resilient estimation algorithms is included,illustrating the latest defensive measures safeguarding RSE from ***,some prevalent attacks impairing the confidentiality and data availability of RSE are examined from both attackers'and defenders'***,several challenges and open problems are presented to inspire further exploration and future research in this field.

关键词： Cyber-attacks Kalman filtering remote state estimation unreliable transmission channels

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Seismic force demands on acceleration-sensitive nonstructural components:a state-of-the-art review

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Earthquake Engineering and Engineering Vibration 2021年第1期20卷 39-62页

作者： Wang Tao shang Qingxue Li Jichao Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China

Nonstructural components(NSCs)are parts,elements,and subsystems that are not part of the primary loadbearing system of building structures but are subject to seismic *** to NSCs may disrupt the functionality of buildings and result in significant economic losses,injuries,and *** past decades,extensive studies have been conducted on the seismic performance and seismic design methods of *** the input for the seismic design of NSCs,floor response spectra(FRS)have attracted the attention of researchers *** paper presents a state-of-the-art review of *** methods for generating FRS are summarized and compared with those in current seismic design codes.A detailed review of the parameters influencing the FRS is *** parameters include the characteristics of ground motion excitation,supporting building and *** floor acceleration response and the FRS obtained from experimental studies and field observations during earthquakes are also *** RC frames are used in a case study to compare the peak floor acceleration(PFA)and FRS calculated from time history analyses(THA)with that generated using current seismic design codes and different methods in the *** knowledge gaps are identified,including uncertainties associated with developing FRS,FRS generation methods for different types of buildings,the need for comprehensive studies on absolute acceleration,relative velocity,and relative displacement FRS,and the calibration of FRS by field observations during earthquakes.

关键词： nonstructural components peak floor acceleration floor response spectra component amplification factor

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Determination of r Factor of Kalbach-Mann Systematics for Energy Balance

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Communications in Theoretical Physics 2008年第10期50卷 947-950页

作者： ZHANG Jing-shang China Institute of Atomic Energy P.O. Box 275（41） Beijing 102413 China

Kalbach Mann systematics is a very useful formula to discrete the double-differential cross sections of emitted particles. However, the energy balance by using this systematics is still a task to be studied. In the form of Legendre polynomial expansion the energy balance has been proved analytically. In terms of this approach, the formula to determine the prc-equilibrium fraction r factor of Kalbach Mann systematics has been obtained for keeping energy balance strictly. This formula could be straightforwardly applied for describing the double-differential cross sections of all projectile types in the eontinuum spectrum emissions. It indicates that Legendre expansion coefficient with l= 1 is the key term in the energy balance.

关键词： energy balance pre-equilibrium emission systematics

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