A review on some classes of algebraic systems

ABSTRACT

In this paper, we review some algebraic control system. Precisely, linear and bilinear systems on Euclidean spaces and invariant and linear systems on Lie groups. The fourth classes of systems have a common issue: to any class, there exists an associated subgroup. From this object, we survey the controllability property. Especially, from those coming from our contribution to the theory.     

Material design and development: From classical thermodynamics to CALPHAD and ICME approaches

This paper presents an overview and examples of material design and development using (1) classical thermodynamics; (2) CALPHAD (calculation of phase diagrams) modeling; and (3) Integrated Computational Materials Engineering (ICME) approaches. Although the examples are given in lightweight aluminum and magnesium alloys for structural applications, the fundamental methodology and modeling principles are applicable to all materials and engineering applications. The examples in this paper have demonstrated the effectiveness and limitations of classical thermodynamics in solving specific problems (such as nucleation during solidification and solid-state precipitation in aluminum alloys). Computational thermodynamics and CALPHAD modeling, when combined with critical experimental validation, have been used to guide the selection and design of new magnesium alloys for elevated-temperature applications. The future of material design and development will be based on a holistic ICME approach. However, key challenges exist in many aspects of ICME framework, such as the lack of diffusion/mobility databases for many materials systems, limitation of current microstructural modeling capability and integration tools for simulation codes of different length scales.     

Curvature effects on electric-double-layer capacitance

Understanding the microscopic structure and thermodynamic properties of electrode/electrolyte interfaces is central to the rational design of electric-double-layer capacitors (EDLCs). Whereas practical applications often entail electrodes with complicated pore structures, theoretical studies are mostly restricted to EDLCs of simple geometry such as planar or slit pores ignoring the curvature effects of the electrode surface. Significant gaps exist regarding the EDLC performance and the interfacial structure. Herein the classical density functional theory (CDFT) is used to study the capacitance and interfacial behavior of spherical electric double layers within a coarse-grained model. The capacitive performance is associated with electrode curvature, surface potential, and electrolyte concentration and can be correlated with a regression-tree (RT) model. The combination of CDFT with machine-learning methods provides a promising quantitative framework useful for the computational screening of porous electrodes and novel electrolytes.     

Molecular dynamics studies of a model polymer-catalyst-carbon interface

Classical molecular dynamics simulations are performed to obtain insights into structural and dynamical behavior of water and O₂ transport through a model polymer membrane, and at the interface of such hydrated polymer with graphite-supported nanocatalyst platinum particles. Water clustering is observed near the membrane hydrophilic sites constituted by sulfonic groups, which due to their affinity with platinum, are located near the metallic surface. It is found that the diffusion of water through the model hydrated polymer membrane depends strongly on the level of membrane hydration due to contribution from various mechanisms whose relative weights change with the degree of hydration. Possible scenarios for O₂ diffusion are also analyzed.     

中国古典园林艺术创作对现代园林景观设计的启示

我国古典园林艺术。有着悠久的历史渊源与深厚的文化底蕴,并被赋予了丰富的内涵和寓意,在整个世界园林艺术中,有着独特的魅力和重要的地位。文章通过阐述中国古典园林艺术的创作特色,借助部分范例,进行简单剖析,体现其在园林景观设计中的重要性．以及对我国现代园林景观设计的启示。     

北京宣南典型会馆园林研究及保护与利用建议

北京宣南地区是士人文化、平民文化的重要集中地之一,因此这里集中分布了众多的会馆.这些会馆大多是四合院民居形制,其中许多会馆设有附属园林,成为中国传统园林分类系统中的代表之一——会馆园林.但是,由于四合院建筑的破败与更新,很多会馆园林正在城市的不断发展中渐渐被破坏甚至消失.本文通过史料文献查阅,实地调研走访,并将两者进行对比研究分析,整理了其中7座典型会馆园林的历史沿革、现存状况、设计特色,同时也对北京宣南会馆园林的保护与利用提出了建议,以期对北京建筑与园林遗产的保护有借鉴作用.     

动态描述逻辑的可拓集合扩展

通过对可拓集合与经典集合、模糊集合的分析比较,说明可拓集合的特点和优点,用可拓集合代替经典集合或模糊集合作为动态描述逻辑DDL的集合论基础,对DDL进行扩展,生成了一种新的描述逻辑DDES,并给出了DDLES中概念、关系和实例的描述形式以及它们的语义解释,最后对传统描述逻辑ALC、模糊DDL和DDES中的Abox形式进行了比较.     

岭南园林和江南园林美学特征的比较

本文从环境、功用、性格、艺术、文化五个方面,对岭南园林和江南园林美学特征进行了比较,提炼出二者不同的个性特点,提出了园林是文化的载体。     

Pareto最优概念的多目标进化算法综述

群体搜索策略和群体间个体之间的信息交换是进化算法在解决多目标优化问题上的两大优势.目前,基于Pareto最优概念的多目标进化算法已成为多目标优化问题研究的主流方向.详细介绍了该领域的经典算法,特别对各种算法在种群快速收敛并均匀分布于问题的非劣最优域上所采取的策略进行了阐述,并归纳了算法性能评估中需要深入研究的问题.