Burger's方程的AGE与ADE方法比较

以求解Ｂｕｒｇｅｒ’ｓ方程的中心差分格式,显式逆风格式、Ｓａｍａｒｓｋｉｉ格式和修正Ｄｅｎｎｉｓ格式为基础,构造若干新的ＡＧＥ方法与ＡＤＥ方法,给出它们实验模型的数值比较结果。     

移动基站电源管理系统设计

本文给出了一个移动通信基站电源管理系统的设计方案．方案包括以ADI公司高性能处理器Blackfin531为核心、以专．用的电能计量芯片ADE7754进行电能计量和供电状况监测的前置终端设计,服务器端和前置终端单元之间采用主从控制方式的通信协议设计,以及提高电源管理系统抗干扰能力的系统可靠性设计．最后,对本设计进行了总结,并对基站电源管理系统的未来进行了展望．     

基于ARM的智能电热水器控制器设计

提出一种基于ARM和uC/OS-II的嵌入式智能家庭用电管理方案。系统自动检测用电设备情况,合理管理用电设备,可提供过电流等保护,最大限度地节能。为达到此目的,本系统采用模糊控制算法来控制电热水器作为实例。采用ADI公司的ADE7753芯片实现单相电能的计量,此设备也可用于智能电表解决方案。     

二维各向异性磁等离子体的无条件稳定ADE-CNAD-FDTD算法

针对二维各向异性磁等离子体提出一种有效的无条件稳定算法,新算法结合了辅助微分方程(ADE)方法与Crank-Nicolson approximate-decoupling(CNAD)时域有限差分算法仿真各向异性磁等离子体介质。传统的ADE-FDTD方法应用在一维各向异性色散介质具有较高的精度和效率,将提出的新算法ADE-CNAD-FDTD应用到二维各向异性磁等离子体介质中不仅解决了电磁波在具有各向异性和频率色散特性介质中传播的仿真难题,而且去除了CFL稳定性条件。该算法在保留了原有的精度情况下大幅度地提高了计算效率并成为无条件稳定的形式。给出一个算例证明该算法的有效性,通过模拟电磁波在磁等离子体中的传播,仿真结果与传统的ADE-FDTD算法对比,证实了该算法的高效率、无条件稳定性和高精度。     

Structures and electron affinity of XO30,−, XOF40,− and XO2F20,− (X = P,As, Sb,Bi): a theoretical study of novel superhalogen formulae and exceptions of superhalogen formulae

Most superhalogen species are in the form of oxides or halides. To enrich the family of superhalogen species, herein, we investigated the structures and electron affinity (EA) values of higher group 15 elements (X = P, As, Sb, Bi) oxyfluoride species XO₃^0,?, XOF₄^0,? and XO₂F₂^0,?, at the CCSD(T)/aug-cc-pVTZ-pp &; aug-cc-pVTZ //B3LYP/aug-cc-pVTZ-pp &; aug-cc-pVTZ levels (aug-cc-pVTZ-pp for X = Sb and Bi). Some oxyfluoride species, i.e., PO₂F₂^0,?, AsO₂F₂^0,?, SbO₂F₂^0,?, POF₄^0,?, AsOF₄^0,?, SbOF₄^0,? and BiOF₄^0,?, were found to possess higher EA (VDE: 5.0–6.2 eV; ADE: 4.5–5.5 eV) than halogens (F: 3.4 eV; Cl: 3.6 eV). Thus, we recommended that the oxyfluorides in the form of XO₂F₂^0,? and XOF₄^0,? should be considered as potential superhalogens, which have not been considered previously. Surprisingly, we showed that BiO₃ and BiO₂F₂, in superhalogen formulae, possess a high vertical detachment energy (VDE) yet a low adiabatic detachment energy (ADE). This is in marked contrast to the previously reported superhalogens, which generally contain both the high VDE and high ADE values. It is the first report about exceptions of superhalogen formulae. These findings revealed that for the analogous main-group compounds with the same structural formula, the difference in the metallic property of the core element could lead to the significant difference in the ground structures of either the anionic or neutral structures, which would result in the much differed superhalogen features.     

Torus structure on graphs and twisted partition functions for minimal and affine models

Using the Ocneanu quantum geometry of ADE diagrams (and of other diagrams belonging to higher Coxeter–Dynkin systems), we discuss the classification of twisted partition functions for affine and minimal models in conformal field theory and study several examples associated with the WZW, Virasoro and cases.     

具有负载识别功能的数字电能表设计

针对现有电能表精度差、可靠性低的问题,设计了一种基于SST89E564RD单片机和ADE7753电能计量芯片的智能数字电能表,该数字电能表具有能量累积、费用计算、恶性负载识别、过流过载保护、定时关断、电力线载波通信等功能.给出了硬件原理和软件流程,采用C语言模块化编程,便于理解和维护.市场应用表明该数字电能表精度能够达到1.0级,运行可靠,具有广泛的应用前景.     

Coxeter and Dynkin Diagrams and Their Associated Twisted Partition Functions for the Virasoro Minimal Models

To a pair (G, G) of ADE Dynkin diagrams one can associate five types of sesquilinear forms on the space of Virasoro characters. These forms can be interpreted, in terms of minimal models, as twisted partition functions. Our classification rests on the possibility of twisting the torus structures of the two diagrams G and G. For the torus structure of a given diagram, one can introduce a single twist, two twists, or no twist at all. We describe the general situation and study an example pertaining to the case of the Virasoro minimal models.     

Quasi-Purifiable Subgroups and Minimal Direct Summands

Let G be an arbitrary Abelian group. A subgroup A of G is said to be quasi-purifiable in G if there exists a pure subgroup H of G containing A such that A is almost-dense in H and H/A is torsion. Such a subgroup H is called a “quasi-pure hull” of A in G. We prove that if G is an Abelian group whose maximal torsion subgroup is torsion-complete, then all subgroups A are quasi-purifiable in G and all maximal quasi-pure hulls of A are isomorphic. Every subgroup A of a torsion-complete p-primary group G is contained in a minimal direct summand of G that is a minimal pure torsion-complete subgroup containing A. An Abelian group G is said to be an “ADE decomposable group” if there exist an ADE subgroup K of G and a subgroup T′ of T(G) such that G = K⊕ T′. An Abelian group whose maximal torsion subgroup is torsion-complete is ADE decomposable. Hence direct products of cyclic groups are ADE decomposable groups.