高压SOI pLDMOS总剂量辐射致BV退化研究

对高压SOI pLDMOS器件总剂量辐射效应进行了研究。分析了不同偏置条件下器件击穿电压的退化机理,并使用TCAD在不同氧化层界面引入固定陷阱电荷,仿真了电离辐射总剂量效应。结果表明,总剂量辐射在FOX和BOX引入辐射陷阱电荷Q_BOX和Q_FOX。Q_FOX增加了漏极附近横向电场,降低了埋氧层电场,使击穿位置由体内转到表面,导致击穿电压退化。Q_BOX降低了埋氧层电场,降低了埋氧层压降,导致击穿电压退化。     

BV solutions of a singular diffusion equation

In this paper, we study discontinuous solutions of a partial differential equation of strongly degenerate parabolic type. A notion of weak solutions of BV class is proposed, and existence and uniqueness results are obtained.     

A Variational Model for Staircase Reduction in Image Denoising

We propose a new variational model to reduce the staircase that often appears in Total variation (TV) based models in image denoising. The model uses BV-seminorm and Besov-seminorm to measure the piece-wise constant component and piecewise smooth component of the image, respectively. We discuss the nontrivial prop-erty of the proposed model and introduce an alternating iteration algorithm that combines the dual projection al-gorithm with Wavelet soft thresholding (WST) algorithm to solve the model numerically. The experimental results show that the proposed model is effective for noise removal and staircase reduction, while the contour can be preserved in the denoised images. Furthermore, compared with two classical staircase reduction models, CEP2 and TGV, the proposed model is much faster than these two models.     

Metabolomics comparison of chemical components and metabolic regulations in different parts of Eucommia ulmoides Oliv

Eucommia ulmoides Oliv. (EU) is an herb with variety of pharmacological activities. As the demand for EU as a medical source increases, its limited availability is becoming an urgent problem. The bark of EU—Eucommia cortex (EC)—was the main medicinal part of EU, whose yield has been too low to meet market requirements. The EU leaves—Eucommiae folium (EF)—obtained easily from the trees, traditionally considered less valuable than the EU bark. This study compared chemical components and metabolic regulations in different parts of EU using metabolomics to explore the potential for alternative medical sources of EU. The results demonstrated that the composition of EC differs slightly from the composition of EF, and there are some differences in the content of individual ingredients between EC and EF. Combined pharmacodynamic/metabolomics analysis showed that both EC and EF could improve the bone metabolism markers and trabecular microarchitecture of ovariectomized rats mainly by intervening in amino acid metabolism. Our data suggest that EF is a potential alternative medicinal option when EU resources are scarce, and this study provides a mechanistic framework for the benefits of EF in osteoporosis disease.     

Global existence of classical solutions of Goursat problem for quasilinear hyperbolic systems with BV data

We investigate the existence of a global classical solution to the Goursat problem for linearly degenerate quasilinear hyperbolic systems. As the result in [A. Bressan, Contractive metrics for nonlinear hyperbolic systems, Indiana Univ. Math. J. 37 (1988) 409–421] suggests that one may achieve global smoothness even if the C¹ norm of the initial data is large, we prove that, if the C¹ norm of the boundary data is bounded but possibly large, and the BV norm of the boundary data is sufficiently small, then the solution remains C¹ globally in time. Applications include the equation of time‐like extremal surfaces in Minkowski space R^{1 + (1 + n)} and the one‐dimensional Chaplygin gas equations. Copyright © 2013 John Wiley & Sons, Ltd.     

On the AKSZ Formulation of the Poisson Sigma Model

We review and extend the Alexandrov–Kontsevich–Schwarz–Zaboronsky construction of solutions of the Batalin–Vilkovisky classical master equation. In particular, we study the case of sigma models on manifolds with boundary. We show that a special case of this construction yields the Batalin–Vilkovisky action functional of the Poisson sigma model on a disk. As we have shown in a previous paper, the perturbative quantization of this model is related to Kontsevich's deformation quantization of Poisson manifolds and to his formality theorem. We also discuss the action of diffeomorphisms of the target manifolds.     

Kinetic Formulation and Uniqueness for Scalar Conservation Laws with Discontinuous Flux

We prove a uniqueness result for BV solutions of scalar conservation laws with discontinuous flux in several space dimensions. The proof is based on the notion of kinetic solution and on a careful analysis of the entropy dissipation along the discontinuities of the flux.     

Global Existence of Large BV Solutions in a Model of Granular Flow

In this paper we analyze a set of equations proposed by Hadeler and Kuttler [20 Hadeler , K. P. , Kuttler , C. ( 1999 ). Dynamical models for granular matter . Granular Matter 2 : 9 – 18 . [Google Scholar]], describing the flow of granular matter in terms of the heights of a standing layer and of a moving layer. By a suitable change of variables, the system can be written as a 2 × 2 hyperbolic system of balance laws, which we study in the one-dimensional case. The system is linearly degenerate along two straight lines in the phase plane, and therefore is weakly linearly degenerate at the point of the intersection. The source term is quadratic, consisting of product of two quantities, which are transported with strictly different speeds. Assuming that the initial height of the moving layer is sufficiently small, we prove the global existence of entropy-weak solutions to the Cauchy problem, for a class of initial data with bounded but possibly large total variation.     

A generalization of bounded variation

Generalized Wiener classes are considered. For these classes the exact order of Fourier coefficients with respect to the trigonometric system is established and the estimation of ‖S _n(·, f)-f(·)‖_{C [0,2π]} where S _n(·, f) are the Fourier partial sums, is given. In particular, a uniform convergence criterion for the Fourier trigonometric series is obtained. This revised version was published online in August 2006 with corrections to the Cover Date.