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Effect of Froude similitude deviation on curved channel simulations: A case study in the Middle Yangtze River

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Water Science and Engineering 2023年第3期16卷 289-294页

作者： Xiao-ting Yang qian-qian shang Hui Xu Guo-bin Li Ya-jun Gao Qi-lin Yang Tibet Agricultural and Animal Husbandry University Linzhi 860001China State Key Laboratory of Hydrology–Water Resources and Hydraulic Engineering Nanjing 210029China River and Harbor Engineering Department Nanjing Hydraulic Research InstituteNanjing 210029China

Froude similitude and friction similitude are the two crucial similarity conditions that are often used in physical-scale modeling of ***,models often deviate from Froude similitude when dealing with real-world *** study developed several fixed-bed river models with various curvatures to determine the effect of Froude similitude deviation on curved channel *** were constructed according to the characteristics of the Middle Yangtze *** in longitudinal slope,transverse slope,and main stream line location were measured by varying Froude similitude *** deviations of longitudinal slope and velocity were negligible because friction similitude was accounted *** transverse slope varied significantly with the Froude similitude deviation,and the main stream line varied with the curvature and Froude similitude *** were derived to estimate the slope *** analyses helped to clarify the feasibility of the method of Froude similitude deviation for curved channels.

关键词： Fixed-bed river model Froude similitude deviation Flow movement Water surface slope Middle Yangtze river

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

Observations of semidiurnal M 2 internal tidal parametric subharmonic instability in the northeastern South China Sea

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Journal of Oceanology and Limnology 2021年第1期39卷 56-63页

作者： qian LIU Xiaodong shang Xiaohui XIE School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310000China

Near-diurnal vertically-standing waves with high vertical wavenumbers k z were observed in the velocity and shear fi elds from a set of 75-d long ADCP moored in the northeastern South China Sea(SCS)away from the“critical”latitude of 28.8°.These enhanced near-diurnal internal waves followed a fortnightly spring-neap ***,they always happened during semidiurnal spring tides rather than diurnal springs although strong diurnal internal tides with the fortnightly spring-neap cycle were prevailing,suggesting that they were generated via subharmonic instability(PSI)of dominant semidiurnal M 2 internal *** two semidiurnal internal tidal waves with opposite vertical propagation direction intersected,both semidiurnal subharmonic and super harmonic waves were largely intensifi *** observed maximum diurnal velocity amplitudes were up to 0.25 m/*** kinetic energy and shear spectra further suggested that frequencies of daughter waves were not always perfectly equal to M 2/*** superposition of two daughter waves with nearly equal frequencies and nearly opposite k z in a PSI-triad leaded to the vertically-standing waves.

关键词： internal tides South China Sea(SCS) resonant interactions rotary spectra parametric subharmonic instability

Role of Covariance Correlation Tensor in Establishment of Criterion of Quantum Entanglement

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Communications in Theoretical Physics 2005年第3X期44卷 445-450页

作者： qian shang-Wu GU Zhi-Yu Physics Department Peking University Beijing 100871 China Physics Department Capital Normal University Beijing 100037 China

This article discusses the role of covariance correlation tensor in the establishment of the criterion of quantum entanglement. It gives a simple example to show the powerfulness in the treatment of quantum dense coding,and illustrates the fact that this method also provides theoretical basis for establishing corresponding knotted pictures.

关键词： quantum entanglement covariance correlation tensor quantum dense coding knotted picture

Knotted Pictures of Hadamard Gate and CNOT Gate

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Communications in Theoretical Physics 2009年第6期51卷 967-972页

作者： GU Zhi-Yu qian shang-Wu Physics Department Capital Normal University Beijing 100037 China Physics Department Peking University Beijing 100871 China

This paper obtains the knotted pictures of Hadamard gate and CNOT gate in terms of surgical operations described in knot theory.

关键词： two qubit quantum logic gate surgical operations in knot theory knotted picture

Influence of B1 code correlation loop for vector tracking structures under complicated environment

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Journal of Systems Engineering and Electronics 2019年第6期30卷 1053-1063页

作者： WANG qian shang Feng DU Liming ZHOU Wenjia School of Electronic Engineering Xi’an University of Posts and Telecommunications Qingdao Huatong Intelligent Research Institute

The code tracking loop is a key component for user positioning. The pseudorange information of Bei Dou B1 signals has been fused and changed for vector tracking, so a correlation output model for complex scenarios is designed to prevent the propagation of error and valuate the signal performance. The relevant software and hardware factors that affect the output are analyzed.A single channel time-division multiplexing(TDM) method for multicorrelation data extraction is proposed. Statistical characteristics of the correlation output data for both vector and scalar structures are evaluated. Simulation results show that correlation outputs for both structures follow normal or Chi-squared distributions in normal conditions, and the Gamma distribution in harsh conditions. It is shown that a tracking model based on the multi-channel fusion hardly changes the probability distribution of the correlation output in the normal case, but it reduces the ranging error of the code loop, and hence the tracking ability of the code loop for weak signals is improved. Furthermore, vector tracking changes the pseudorange characteristics of channels anytime, and affects the mutual correlation outputs of the code loops in the abnormal case. This study provides a basis for the subsequent design of autonomous integrity algorithms for vector tracking.

关键词： vector tracking signal quality code correlation pseu dorange error scalar tracking correlation peak loss.

A Note on Calculation of Phase Space Path Integral by Means of Invariants

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Communications in Theoretical Physics 2006年第5期45卷 813-814页

作者： qian shang-Wu GU Zhi-Yu physics Department Peking University Beijing 100871 China physics Department Capital Normal University Beijing 100037 China

In this note we use the method of invariant to calculate the phase space path integral appearing in our previous article.

关键词： phase space path integral invariant propagator

Gauge Invariance of a Time-Dependent Harmonic Oscillator in Magnetic Dipole Approximation

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Communications in Theoretical Physics 2008年第2期49卷 308-310页

作者： qian shang-Wu WANG Jing-Shan physics Department Peking University Beijing 100871 China Physics Department New Jersey Institute of Technology Newark NJ 07201 USA

A manifestly gauge-invariant formulation of non-relativistic quantum mechanics is applied to the case of time-dependent harmonic oscillator in the magnetic dipole approximation. A general equation for obtaining gauge-... 详细信息

关键词： gauge-invariant formulation of non-relativistic quantum mechanics time-dependent harmonic oscillator magnetic dipole approximation gauge-invariant transition probability amplitude

Evolutions of Yang Phase Under Cyclic Condition and Adiabatic Condition

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Communications in Theoretical Physics 2005年第2X期44卷 243-246页

作者： qian shang-Wu GU Zhi-Yu Physics Department Peking University Beijing 100871 China Physics Department Capital Normal University Beijing 100037 China

There are three non-integrable phases in literatures: Berry phase, Aharonov-Anandan phase, and Yang phase. This article discusses the evolutions of Yang phase under the cyclic condition and the adiabatic condition for the generaltime-dependent harmonic oscillator, thus reveals the intimate relations between these three non-integrable phases.

关键词： Berry phase A-A phase Yang phase general time-dependent harmonic oscillator