We show that it is possible to realize quantum superpositions of switched-on and-off strong light-matter interaction in a single quantum dot-semiconductor microcavity system.Such superpositions enable the observation ...We show that it is possible to realize quantum superpositions of switched-on and-off strong light-matter interaction in a single quantum dot-semiconductor microcavity system.Such superpositions enable the observation of counterintuitive quantum conditional dynamics effects.Situations are possible where cavity photons as well as the emitter luminescence display exponential decay but their joint detection probability exhibits vacuum Rabi oscillations.Remarkably,these quantum correlations are also present in the nonequilibrium steady state spectra of such coherently driven dissipative quantum systems.展开更多
This paper proposes a scheme for generating arbitrary superpositions of several coherent states along a straight line for a cavity mode. In the scheme, several atoms are sent through a cavity initially in a strong coh...This paper proposes a scheme for generating arbitrary superpositions of several coherent states along a straight line for a cavity mode. In the scheme, several atoms are sent through a cavity initially in a strong coherent state. The superposition of several coherent states with desired coefficients may be generated if each atom is detected in the excited state after it exits the cavity. The scheme is based on resonant atom-cavity interaction and no classical field is required during and after the atom cavity interaction. Thus, the scheme is very simple and the interaction time is very short, which is important in view of decoherence.展开更多
We present an alternative scheme for preparing the superpositions of coherent states along a straight line of a cavity field using degenerate atom-cavity field Raman interaction. In the scheme, a collection of A-type ...We present an alternative scheme for preparing the superpositions of coherent states along a straight line of a cavity field using degenerate atom-cavity field Raman interaction. In the scheme, a collection of A-type three-level atoms is orderly sent through the cavity to interact with the cavity field adjusted by a microwave source connected to it, followed by state-selective measurements. In this way, we can prepare the superpositions of several coherent states along a straight line with arbitrary weighting factors for the cavity field. In the scheme, the coherence of the atom-cavity system may be maintained and the second microwave field is unnecessary, which is prior to the previous scheme.展开更多
Mechanism interaction between cracks with different orientation angles is analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect does not occur when t...Mechanism interaction between cracks with different orientation angles is analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect does not occur when the microcrack is along the direction parallel or perpendicular to the principal tensile stress, which is different from the conclusion drawn by Ortiz （1987）. The mechanism of microcrack generation and the effect of the microcrack zone on the main crack tip are studied. It is concluded that the microcrack zone has effect on the main crack tip, which increases with the increase of microcrack density and length.展开更多
In this article,we consider the(3+1)-dimensional generalized Kadomtsev–Petviashvili(GKP)equation in fluids.We show that a variety of nonlinear localized waves can be produced by the breath wave of the GKP model,such ...In this article,we consider the(3+1)-dimensional generalized Kadomtsev–Petviashvili(GKP)equation in fluids.We show that a variety of nonlinear localized waves can be produced by the breath wave of the GKP model,such as the(oscillating-)W-and M-shaped waves,rational W-shaped waves,multi-peak solitary waves,(quasi-)Bell-shaped and W-shaped waves and(quasi-)periodic waves.Based on the characteristic line analysis and nonlinear superposition principle,we give the transition conditions analytically.We find the interesting dynamic behavior of the converted nonlinear waves,which is known as the time-varying feature.We further offer explanations for such phenomenon.We then discuss the classification of the converted solutions.We finally investigate the interactions of the converted waves including the semi-elastic collision,perfectly elastic collision,inelastic collision and one-off collision.And the mechanisms of the collisions are analyzed in detail.The results could enrich the dynamic features of the high-dimensional nonlinear waves in fluids.展开更多
An industrial building is a non-classically damped system due to the different damping properties of the primary structure and equipment.The objective of this paper is to quantify the range of applicability of the rea...An industrial building is a non-classically damped system due to the different damping properties of the primary structure and equipment.The objective of this paper is to quantify the range of applicability of the real model superposition approximation method to the seismic response calculation of industrial buildings.The analysis using lumped mass-and-shear spring models indicates that for the equipment-to-structure frequency ratiosγf>1.1 orγf<0.9,the non-classical damping effect is limited,and the real mode superposition approximation method provides accurate estimates.For 0.9<γf<1.1,the system may have a pair of closely spaced frequency modes,and the non-zero off-diagonal damping terms have a non-negligible effect on the damping ratios and mode shape vectors of these modes.For 0.9<γf<1.1 and the equipment-to-structure mass ratiosγm<0.07,the real mode superposition approximation method results in large errors,while the approximation method can provide an accurate estimation for 0.9<γf<1.1 andγm>0.07.Furthermore,extensive parametric analyses are conducted,where both steel structures and reinforced concrete structures with equipment with various damping ratios are considered.Finally,the finite element analysis of a five-story industrial building is adopted to validate the proposed range of applicability.展开更多
采用迭加原理和Kachanov提出的简化方法,研究了裂纹间的相互作用机理,分析了不同裂纹布置形式所产生的增强或屏蔽效应,发现当微裂纹沿着或垂直于最大拉应力方向布置时都不产生最大的作用效应,这有别于Ortiz[ASME Journal of Applied Mec...采用迭加原理和Kachanov提出的简化方法,研究了裂纹间的相互作用机理,分析了不同裂纹布置形式所产生的增强或屏蔽效应,发现当微裂纹沿着或垂直于最大拉应力方向布置时都不产生最大的作用效应,这有别于Ortiz[ASME Journal of Applied Mechanics,1987,54(3):54-58]的结论.还探讨了混凝土类材料的微裂纹的产生机制及微裂纹区对主裂纹尖端产生的作用效应,得出微裂纹区对主裂纹是起增强的作用,增强程度随微裂纹密度和微裂纹长度的增大而增大的结论.展开更多
文摘We show that it is possible to realize quantum superpositions of switched-on and-off strong light-matter interaction in a single quantum dot-semiconductor microcavity system.Such superpositions enable the observation of counterintuitive quantum conditional dynamics effects.Situations are possible where cavity photons as well as the emitter luminescence display exponential decay but their joint detection probability exhibits vacuum Rabi oscillations.Remarkably,these quantum correlations are also present in the nonequilibrium steady state spectra of such coherently driven dissipative quantum systems.
基金Project supported by the National Natural Science Foundation of China (Grant No. 10674025)the Doctoral Foundation of the Ministry of Education of China (Grant No. 20070386002)
文摘This paper proposes a scheme for generating arbitrary superpositions of several coherent states along a straight line for a cavity mode. In the scheme, several atoms are sent through a cavity initially in a strong coherent state. The superposition of several coherent states with desired coefficients may be generated if each atom is detected in the excited state after it exits the cavity. The scheme is based on resonant atom-cavity interaction and no classical field is required during and after the atom cavity interaction. Thus, the scheme is very simple and the interaction time is very short, which is important in view of decoherence.
文摘We present an alternative scheme for preparing the superpositions of coherent states along a straight line of a cavity field using degenerate atom-cavity field Raman interaction. In the scheme, a collection of A-type three-level atoms is orderly sent through the cavity to interact with the cavity field adjusted by a microwave source connected to it, followed by state-selective measurements. In this way, we can prepare the superpositions of several coherent states along a straight line with arbitrary weighting factors for the cavity field. In the scheme, the coherence of the atom-cavity system may be maintained and the second microwave field is unnecessary, which is prior to the previous scheme.
基金supported by the National Natural Science Foundation of China (Nos. 10972072, 50679022, and 10872052)National Basic Research Program of China (No. 2007CB714104)the state Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering at Hohai University (No. 2009585912)
文摘Mechanism interaction between cracks with different orientation angles is analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect does not occur when the microcrack is along the direction parallel or perpendicular to the principal tensile stress, which is different from the conclusion drawn by Ortiz （1987）. The mechanism of microcrack generation and the effect of the microcrack zone on the main crack tip are studied. It is concluded that the microcrack zone has effect on the main crack tip, which increases with the increase of microcrack density and length.
基金supported by the National Natural Science Foundation of China(Grant Nos.11875126,61705006,and 11947230)the China Postdoctoral Science Foundation(No.2019M660430).
文摘In this article,we consider the(3+1)-dimensional generalized Kadomtsev–Petviashvili(GKP)equation in fluids.We show that a variety of nonlinear localized waves can be produced by the breath wave of the GKP model,such as the(oscillating-)W-and M-shaped waves,rational W-shaped waves,multi-peak solitary waves,(quasi-)Bell-shaped and W-shaped waves and(quasi-)periodic waves.Based on the characteristic line analysis and nonlinear superposition principle,we give the transition conditions analytically.We find the interesting dynamic behavior of the converted nonlinear waves,which is known as the time-varying feature.We further offer explanations for such phenomenon.We then discuss the classification of the converted solutions.We finally investigate the interactions of the converted waves including the semi-elastic collision,perfectly elastic collision,inelastic collision and one-off collision.And the mechanisms of the collisions are analyzed in detail.The results could enrich the dynamic features of the high-dimensional nonlinear waves in fluids.
基金Fund of China National Industrial Building Diagnosis and Reconstruction Engineering Technology Research Center under Grant No.YZA2017Ky03the Beijing Natural Science Foundation under Grant No.JQ18029the National Natural Science Foundation of China under Grant No.52078277。
文摘An industrial building is a non-classically damped system due to the different damping properties of the primary structure and equipment.The objective of this paper is to quantify the range of applicability of the real model superposition approximation method to the seismic response calculation of industrial buildings.The analysis using lumped mass-and-shear spring models indicates that for the equipment-to-structure frequency ratiosγf>1.1 orγf<0.9,the non-classical damping effect is limited,and the real mode superposition approximation method provides accurate estimates.For 0.9<γf<1.1,the system may have a pair of closely spaced frequency modes,and the non-zero off-diagonal damping terms have a non-negligible effect on the damping ratios and mode shape vectors of these modes.For 0.9<γf<1.1 and the equipment-to-structure mass ratiosγm<0.07,the real mode superposition approximation method results in large errors,while the approximation method can provide an accurate estimation for 0.9<γf<1.1 andγm>0.07.Furthermore,extensive parametric analyses are conducted,where both steel structures and reinforced concrete structures with equipment with various damping ratios are considered.Finally,the finite element analysis of a five-story industrial building is adopted to validate the proposed range of applicability.
文摘采用迭加原理和Kachanov提出的简化方法,研究了裂纹间的相互作用机理,分析了不同裂纹布置形式所产生的增强或屏蔽效应,发现当微裂纹沿着或垂直于最大拉应力方向布置时都不产生最大的作用效应,这有别于Ortiz[ASME Journal of Applied Mechanics,1987,54(3):54-58]的结论.还探讨了混凝土类材料的微裂纹的产生机制及微裂纹区对主裂纹尖端产生的作用效应,得出微裂纹区对主裂纹是起增强的作用,增强程度随微裂纹密度和微裂纹长度的增大而增大的结论.
