On a relation of the angular frequency to the Aharonov–Casher geometric phase in a quantum dot

By analysing the behaviour of a neutral particle with permanent magnetic dipole moment confined to a quantum dot in the presence of a radial electric field, Coulomb-type and linear confining potentials, then, an Aharonov–Bohm-type effect for bound states and a dependence of the angular frequency of the system on the Aharonov–Casher geometric phase and the quantum numbers associated with the radial modes, the angular momentum and the spin are obtained. In particular, the possible values of the angular frequency and the persistent spin currents associated with the ground state are investigated in two different cases.     

An adaptive quantization algorithm without side information for depth map coding

This paper presents a novel block-adaptive quantization scheme for efficient bit allocation without side information in depth map coding. Since the type of distortion in a depth map causes different effects in terms of the visual artifacts in a synthesized view, the proposed method adaptively assigns the number of bits according to the characteristics of the corresponding texture block. I have studied the details of the depth map and its rendered view distortion, modeled these analytically, and then proposed a new rate and distortion model for depth map coding. Finally, I derived a simple closed-form solution based on my proposed rate and distortion model, which determines the block-adaptive quantization parameter without any side information. Experimental results show that the proposed scheme can achieve coding gains of more than 0.6% and 1.4% for quarter- and full-resolution depth maps, respectively, in a multi-view-plus-depth 3D system.     

“互联网+”背景下高职“应用文写作”课线上教学模式探析

在“互联网+”背景下,一场猝不及防的新冠疫情催生了一大批基于在线教学模式APP的创新应用。文章以智慧树“知到”APP为切入点,探析高职“应用文写作”课线上教学模式、实践效果及问题反思。     

Early merge mode decision for texture coding in 3D-HEVC

As the upcoming 3D video coding standard, high efficiency video coding (HEVC) based 3D video coding (3D-HEVC) has been drafted. In 3D-HEVC, the computational complexity of mode decision process is significantly high due to exhaustive modes’ checks for coding units (CU) derived from recursive quad-tree partitioning. In this paper, we propose an early merge mode decision method for complexity reduction of dependent texture views. First, inter-view correlation and hierarchical depth correlation of coding modes are separately analyzed for B frame and P frame. Then, conditions to early determine merge mode coded CUs are derived based on the correlations. All of the early determined CUs only check merge modes in the mode decision process, which brings considerable complexity reduction. Experimental results demonstrate that the proposed method can achieve average 20.4% of encoding time saving for dependent texture views with negligible rate distortion performance loss.     

氧化物玻璃中的类分子结构单元

本文引入团簇加连接原子模型来解析硅酸盐玻璃相关氧化物的结构,并给出了这些氧化物的最小结构单元——类分子结构单元.参与网络形成体的氧化物主要以三角形或者四面体的配位体形式存在,构建玻璃的三维网络状骨架.如基础的网络形成体SiO₂,其类分子结构单元团簇式是为[Si-O₄]Si,含有的价电子数为32,形成四面体网络.中间体以同时形成八面体和四面体为特征,网络外体则以立方体和八面体为主.经证实,这些类分子结构单元无一例外,均满足八电子规则（即每个结构单元所含的价电子总数为8的整数倍）,具有分子的属性.玻璃中氧化物类分子结构单元概念的提出,将为后续的玻璃成分设计工作打下基础.