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Aharonov-Bohm-Type Electron Interference in a Two-Mode Squeezed Vacuum Field

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Chinese Physics Letters 1998年第6期15卷 393-394页

作者： SHAO Bin zou jian Department of Applied Physics Beijing Institute of TechnologyBeijing 100081

Electron interference related to Aharonov-Bohm effect in the presence of the two-mode quantized radiation field is *** of the temporal behavior of electron interference are *** is shown that for the two-mode squeezed vacuum field the time evolution of the intensity of electron interference can exhibit very interesting periodic spontaneous collapse and revival(CR).In addition,the relation between CR and the quantum fluctuation in electron interference is also discussed.

关键词： Electron vacuum quantum

Periodic Revivals of Squeezing in a Mesoscopic Josephson Junction

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Chinese Physics Letters 1999年第6期16卷 449-451页

作者： zou jian SHAO Bin Department of Applied Physics Beijing Institute of TechnologyBeijing 100081

The fraction between a mesoscopic Josephson junction and a quantized electromagnetic field is discussed quantum *** the external field approximation,it is shown that if the Held is prepared in a coherent state and the... 详细信息

关键词： Josephson Periodic initially

Robust Error Density Estimation in Ultrahigh Dimensional Sparse Linear Model

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Acta Mathematica Sinica,English Series 2022年第6期38卷 963-984页

作者： Feng zou Heng jian CUI School of Mathematical Sciences Capital Normal UniversityBeijing 100048P.R.China

This paper focuses on error density estimation in ultrahigh dimensional sparse linear model,where the error term may have a heavy-tailed ***,an improved two-stage refitted crossvalidation method combined with some robust variable screening procedures such as RRCS and variable selection methods such as LAD-SCAD is used to obtain the submodel,and then the residual-based kernel density method is applied to estimate the error density through LAD *** given conditions,the large sample properties of the estimator are also ***,we explicitly give the relationship between the sparsity and the convergence rate of the kernel density *** simulation results show that the proposed error density estimator has a good performance.A real data example is presented to illustrate our methods.

关键词： Ultrahigh dimensional sparse linear model robust density estimation refitted crossvalidation method asymptotic properties

THREE-DIMENSIONAL FLOW AROUND TWO TANDEM CIRCULAR CYLINDERS WITH VARIOUS SPACING AT Re=220

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Journal of Hydrodynamics 2006年第1期18卷 48-54页

作者： DENG jian REN An-lu zou jian-feng Department of Mechanics Zhejiang University Hangzhou 310027 China

The flow around two tandem circular cylinders was studied by a three-dimensional numerical simulation of the Navier-Stokes equations at Re=220 . The improved virtual boundary method was applied to model the no-slip boundary condition of the cylinders. The results show that as the spac ing ratio L/D≥4 , the three dimensionality occurs in the wake. When L/D≤3.5 the wake keeps a two-dimensional state at the Reynolds number Re=220 . The critical spacing for the appearance of three-dimensional instability obtained is at the range 3.5〈 L/D 〈 4, similar to the critical spacing found in two-dimensional case. Two sources of instability from upstream and downstream cylinder generate a complicat ed vortex structures in the wake, investigated by streamlines topology analysis in the streamwise plane. Many other interesting problems were also addressed in this paper.

关键词： three-dimensional Navier-Stokes equations,virtual boundary method flow around two tandem circular cylinders three-dimensional vortex structure

Entropy Exchange and Entanglement in Superconducting Charge Qubit Inside a Resonant Cavity with Intrinsic Decoherence

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Communications in Theoretical Physics 2008年第6期49卷 1463-1467页

作者： ZHANG jian SHAO Bin zou jian Department of Physics Beijing Institute of Technology Beijing 100081 China

By considering the intrinsic decoherence effect, we investigate the entropy exchange and entanglement in the interacting system of a superconducting charge qubit coupled to a single-mode optical cavity. We found that although the intrinsic decoherence leads to an irreversible evolution of the interacting system due to a suppression of coherent quantum features through the decay of off-diagonal matrix elements of the density operator, and has an apparently influence on the partial entropies of the two-component subsystems, it dose not destroy entropy exchange behavior. In addition, the lower bound of the concurrence, as the measure of entanglement of the coupling system, is calculated. It is shown that the evolution of entanglement is sensitive to the change of the intrinsic decoherence.

关键词： intrinsic decoherence entropy exchange entanglement the lower bound of concurrence

Quantum Information Processing in a Coupled Cavity Array

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Communications in Theoretical Physics 2008年第12期50卷 1312-1316页

作者： LI jian zou jian SHAO Bin Department of Physics Beijing Institute of Technology Beijing 100（}81 China

We consider a one-dimensional array of L identical coupled cavities,and each cavity is doped with atwo-level ***,it has been developed in several varieties by the newest *** find that theone-qubit quantum state can be perfectly transferred through the cavity array,and the entanglement between the firsttwo qubits can also be transferred to the last two *** addition,we successfully realized the entangling gate andswap gate in the coupled cavity array.

关键词： state transfer entanglement transfer quantum gate coupled cavity array

The critical case for a Berestycki-Lions theorem

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Science China Mathematics 2014年第3期57卷 541-554页

作者： ZHANG jian zou WenMing Department of Mathematical Sciences Tsinghua University

We consider the existence of the ground states solutions to the following Schrodinger equation -△u ＋ V（x）u = f（u）, u ∈ H1（RN）, where N ） 3 and f has critical growth. We generalize an earlier theorem due to ... 详细信息

关键词： meromorphic function normal family the sequence of omitted functions

RS trigger based relaxation oscillator for temperature measurement circuit

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The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 118-122页

作者： zou Zhi-ge zou Xue-cheng jian Wen-xiang LEI jian-ming Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Resistance-to-time converter is always used for digital temperature measurement. An reset-set （RS） trigger based, relaxation oscillator based temperature measurement circuit, which is used to convert the change of thermistor sensor into a frequency signal for later processing, has been presented in this article. The RS trigger, which is composed of two inverters designed with distinct logical transition threshold voltages by changing the metal-oxide-semiconductor （MOS） transistor gains, has the same function as the Schmitt trigger in the relaxation oscillator. The advantage of the RS trigger based Schmitt trigger is that it reduces the dependence to supply voltage, chip temperature, and process variation. This temperature measurement circuit has been applied in a clinical thermometer chip that can measure temperature to an accuracy of better than 0.05 ℃ down to 1.1 V battery voltage. It is fabricated in 0.5 μm double metal single poly complementary MOS （CMOS） process.

关键词： temperature measurement relaxation oscillator RS trigger Schmitt trigger

Regulation of DNA break repair by transcription and RNA

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Science China(Life Sciences) 2017年第10期60卷 1081-1086页

作者： jian Ouyang Li Lan Lee zou Massachusetts General Hospital Cancer Center Harvard Medical School Boston MA 02129 USA University of Pittsburgh Cancer Institute University of Pittsburgh School of Medicine Pittsburgh PA 15213 USA Department of Microbiology and Molecular Biology University of Pittsburgh School of Medicine Pittsburgh PA 15219 USA Department of Pathology Massachusetts General Hospital Harvard Medical School Boston MA 02115 USA

Repair of DNA double-strand breaks(DSBs) via the homologous recombination(HR) pathway is a highly regulated process. A number of proteins that participate in HR are intricately modulated by the cell cycle and chromatin environments of DSBs. Recent studies have revealed a clear impact of transcription on HR in transcribed regions of the genome. Several models have been put forth to explain how the process of transcription and/or its RNA products may influence HR. Here we discuss the results and models from these studies, presenting an emerging view of transcription-coupled DSB repair.

关键词： DNA break repair transcription RNA