Back-action Induced Non-equilibrium Effect in Electron Charge Counting Statistics

We report our study of the real-time charge counting statistics measured by a quantum point contact (QPC) coupled to a single quantum dot (QD) under different back-action strength. By tuning the QD-QPC coupling or QPC bias, we controlled the QPC back-action which drives the QD electrons out of thermal equilibrium. The random telegraph signal (RTS) statistics showed strong and tunable non-thermal-equilibrium saturation effect, which can be quantitatively characterized as a back-action induced tunneling out rate. We found that the QD-QPC coupling and QPC bias voltage played different roles on the back-action strength and cut-off energy.Comment: 4 pages, 4 figures, 1 tabl

A fast topology optimization method of damping material layer for noise reduction to elastic curved plate-cavity structure

This paper presents a fast topology optimization method of damping material layer for noise reduction to elastic curved plate (shell)-cavity structure. Using less as far as possible the damping materials reach the maximum efficiency of one's vibration or noise reduction. Energy method is employed. The way to determine the location where the damping material pasted on is to find the location where damping material’s energy will lose more. The computational model is based on a finite element discretization. Assuming pasting a small amount of damping materials on the structure has little effect on vibration mode, the relationship between energy loss of the damping material on each element and the displacement of the nodes of the plate (shell) during a period of vibration was deduced. Damping material was laid out on the element location where damping layer energy will lose most, and then the second gradually, until optimization target was achieved. Commercial finite element software was used to obtain the finite element model of complex engineering structures. Nodes information, stiffness and mass matrix were read out by Matlab subroutines. A numerical result of topology optimization of damping material layer on the curved plate-cavity structure noise reduction was presented. The topology optimization method is approximate, simple and suitable for complex engineering applications

A fast algorithm for calculation of random response of elastic thin plate under distributed random load

The calculation of response power spectrum of elastic thin plates, the common load-carrying structures in engineering, under distributed random load has been suffering from many problems, such as low efficiency and complicated computation which cause a lot of inconvenience for engineering applications. Therefore, a fast algorithm is introduced in this article to address above problems. Firstly, the function of the cross power spectrum function is projected onto orthogonal domain of multi-dimension Legendre polynomial, and the infinite distributing information is expressed by finite parameters. Secondly, the dynamic response computation of distributed random load is transformed into that of distributed harmonic load. Thirdly, the response power spectrum density for each frequency point can be obtained by vector multiplication. The fast algorithm is accurate; and its efficiency is much higher than a regular algorithm. Moreover, the fast algorithm conveniently illustrates the coherences of distributed random load. Finally, the fast algorithm is compared with a regular algorithm computation. The high efficiency and precision of the fast algorithm is demonstrated in this paper

Formation and Trend of Guanxi Practice and Guanxi Phenomenon

Abstract: With the increase of interactions between Chinese and international communities, guanxi, a Chinese term, has catching more and more attentions from non-Chinese speaking people. Guanxi, from a sociological perspective, is formed on the ascribed, social or third party bases through the mechanism of ganqing and renqing. Different from other scholars, the authors consider guanxi phenomenon is an outcome of co-impacts from Confucianism and institutionalization of material factors and structural factors. It is argued that guanxi phenomenon will decline in future China gradually because of rationalization required by capitalism but will not disappear completely due to human nature and cultural nature