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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

Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 794-803页

作者： Peng-fei zhao Fu-lin shang Department of Engineering Mechanics School of Aerospace Xi 'an Jiaotong University Xi 'an 710049 China

The failure mode and adhesion of thermal barrier coating (TBC) 8YSZ (ZrO2+8% (w/w) Y2O3) deposited on NiCoCrAlTaY bond coat by atmospheric plasma spraying were investigated. A grooved modified three-point bending specimen that can generate a single interface crack to facilitate the control of crack growth was adopted for testing, which was conducted at the ambient temperature of 100 °C. The morphology and composition of fractured surfaces were examined by means of a scanning electron microscopy (SEM) and an energy disperse spectroscopy (EDS). Images and spectrum show that cracks are initiated and propagated exclusively within YSZ layer adjacent to top/bond coat interface. The load-displacement curves obtained exhibit similar shapes that indicate two distinct stages in crack initiation and stable crack growth. Finite element analyses were performed to extract the adhesion strength of the TBCs. The delamination toughness of the plasma-sprayed 8YSZ coatings at 100 °C, in terms of critical strain energy release rate Gc, can be reliably obtained from an analytical solution.

关键词： Thermal barrier coating (TBC) Three-point bending test Finite element analysis Delamination toughness

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

Knotted Picture of Unknown Quantum State in Process of Quantum Teleportation

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Communications in Theoretical Physics 2008年第5期49卷 1163-1164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 gives the knotted picture of the unknown quantum state in the process of quantum teleportation and the surgical knotted operations of the unitary operators operated on the teleported quantum state.

关键词： Bell bases single particle quantum state knotted picture flip operation inversion operation

Knotted Picture of Unitary Transformation Applied to Single Particle Quantum State

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Communications in Theoretical Physics 2008年第1期49卷 65-68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 introduces the unified expression of four Bell bases and uses the composition operation in knot theory to obtain the knotted picture of unitary operators based on Pauli operators, and gives the knotted expr... 详细信息

关键词： Bell bases composition operation knotted picture inversion relation

Relationship Between Two Classes of Shape-Invariant Potentials

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Communications in Theoretical Physics 2001年第10期36卷 391-394页

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

We show that two classes of shape-invariant potentials are interrelated to each other. For all one-dimensional shape-invariant potentials with parameters related by translation, i.e. the first class of shapc-invariant potentials (SIP1),we can find their multi-parameter deformations with q acting as the deformation parameter, i.e. the second class of shape-invariant potentials (SIP2) with parameters related by scaling. In order to get closed solution of SIP2, we consider two infinitesimal intervals, one is close to q= 0 another close to q = 1, and show that in these intervals we can get separately two first-order approximate solutions in closed form, furthermore we prove that all SIP1 can be obtained by the limiting procedures for corresponding SIP2.

关键词： shape-invariant potential, superpotential, multi-parameter deformation

Wave Mechanics or Wave Statistical Mechanics

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Communications in Theoretical Physics 2007年第2X期48卷 243-244页

作者： qian shang-Wu XU Lai-Zi Physics Department Peking University Beijing 100871 China Institute of Technical Application of Rare Earth Baotou 014000 China

By comparison between equations of motion of geometrical optics and that of classical statistical mechanics, this paper finds that there should be an analogy between geometrical optics and classical statistical mechanics instead of geometrical mechanics and classical mechanics. Furthermore, by comparison between the classical limit of quantum mechanics and classical statistical mechanics, it finds that classical limit of quantum mechanics is classical statistical mechanics not classical mechanics, hence it demonstrates that quantum mechanics is a natural generalization of classical statistical mechanics instead of classical mechanics. Thence quantum mechanics in its true appearance is a wave statistical mechanics instead of a wave mechanics.

关键词： geometrical optics classical statistical mechanics quantum mechanics classical limit

Facet-dependent Cu2O nanocrystals in manipulating alignment of liquid crystals and photomechanical behaviors

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Nano Research 2016年第9期9卷 2581-2589页

作者： qian Wang Yang shang Li Yu Cheng Zou Wenhuan Yao Dongyu zhao Ping Song Huai Yang Lin Guo Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology Ministry of EducationSchool of Chemistry and EnvironmentBeihang UniversityBeijing 100191China Key Laboratory of Micro-Nano Measurement-Manipulation and Physics Ministry of EducationSchool of Physics and Nuclear Energy EngineeringBeihang UniversityBeijing 100191China Department of Advanced Materials & Nanotechnology College of EngineeringPeking UniversityBeijing 100871China

Manipulating the alignment of liquid crystals (LCs) is a hot and fundamental issue for their applications in block copolymers, photonics, actuators, biosensors, and liquid-crystal displays. Here, the surface characteristic of Cu2O nanocrystals was well controlled to manipulate the orientation of the LCs. The mechanism of the orientation of the LCs induced by Cu2O nanocrystals was elucidated based on the interaction between the LCs and Cu2O nanocrystals. To comprehensively prove our assumption, different types of LCs (nematic, cholesteric, and smectic) as well as the same type of LCs with different polarities were selected in our system. Moreover, the photomechanical behaviors of the LC polymer composites demonstrated that the alignment of LCs can be effectively manipulated using Cu2O nanocrystals. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： facet-dependent Cu2O nanocrystals alignment liquid crystals photoactuators