高等学校学科建设内涵略析

本文从高等学校学科的两重属性和学科的内部结构出发,论述了高等学校学科建设的内涵。在学科管理层,学科建设主要包括学科组织建设、学科体系建设、学科要素建设和学科运行机制建设四个方面。     

学术期刊双向经营的探讨

根据我国学术期刊的经营状况,探讨学术期刊向读者提供产品(刊物)和向作者提供刊文服务的双向经营运行模式.作者刊文服务系根据学术期刊出版成本为核算基础的有偿服务,有利于缓解出版资源有限与日益增长的作者刊文需求之间的矛盾,调整作者与编辑的关系,改善学术期刊经营状况,更多更好地为作者服务.分析了作者服务经营的可行性.     

地学领域几个常见量符号的规范使用

介绍地学书刊中经常出现的同位素比值、同位素组成、元素及氧化物的质量分数、摩尔分数和物质的量含量等 5类量的含义 ,阐明这些量在表达及量符号使用上存在的问题 ,以及如何规范地使用量符号来表达这些量。认为提高地学书刊编辑人员的地学专业知识水平是解决存在问题并正确执行《量和单位》国家标准的关键     

Stabilization of a class of nonlinear parametrized systems by a flexible switching adaptive backstepping

In this paper, we consider global adaptive feedback control of nonlinear systems with unknown parameters entering nonlinearly. Such unknown parameters are also not required to lie in a known compact set. Unlike previous results, our proposed adaptive controller is a new double dynamical switching-type controller in which the controller parameter is tuned in a flexible switching manner via a monotonically decreasing switching logic and the controller combines the traditional adaptive theorem with the switching scheme perfectly. Global stability results of the closed-loop system have been proved.     

Semi-global leader-following coordination of multi-agent systems with input saturation and aperiodic intermittent communications

This paper addresses the semi-global leader-following coordination problem of general linear multi-agent systems, in which the control input of each agent is steered by aperiodically intermittent saturated actuator. Both the case with only one virtual leader and the case with multiple virtual leaders are discussed. By using multiple Lyapunov stability theory and applying algebraic Riccati equation-based low-gain feedback technique, sufficient conditions guaranteeing semi-global consensus tracking and semi-global containment tracking are provided. Numerical simulations finally verify the theoretical analysis.     

Network-based control of nonlinear large-scale systems composed of identical subsystems

This paper deals with a control of coupled nonlinear identical systems that admit full exact feedback input-output linearization. The subsystems are linearized using this nonlinear transformation. In the next step, an auxiliary low-dimensional system is derived whose stability implies stability of the original large-scale system. The control law is designed so that the control loops are only local, no information exchange between subsystems is required. Unknown time delay in the feedback are allowed. Two cases are studied: equal time delay for all subsystems or different delay in all subsystems. Results are illustrated by two examples.     

Output regulation for a class of positive switched systems

In this paper, a complete procedure for the study of the output regulation problem is established for a class of positive switched systems utilizing a multiple linear copositive Lyapunov functions scheme. The feature of the developed approach is that each subsystem is not required to has a solution to the problem. Moreover, two types of controllers and switching laws are devised. The first one depends on the state together with the external input and the other depends only the error. The conditions ensuring the solvability of the problem for positive switched systems are presented in the form of linear matrix equations plus linear inequalities under some mild constraints. Two examples are finally given to show the performance of the proposed control strategy.     

Output reachable set estimation for discrete-time switched systems with persistent dwell-time

This paper is concerned with the output reachable set estimation for discrete-time switched systems. The switching signal is considered as persistent dwell-time (PDT), which is more general and flexible compared with the common dwell-time and average dwell-time switching. The estimation of output reachable set is determined by a collection of bounding ellipsoids based on a family of quasi-time-dependent (QTD) Lyapunov functions. Furthermore, a set of non-fragile QTD controllers is designed. Finally, two examples are employed to illustrate the potentials of proposed methods.     

风险投资声誉、智力资本与企业价值

风险资本与智力资本的有效协同能够实现创业企业知识、资本、管理与创新的完美结合,而拥有高声誉背景的风投在利用其经验和广泛的社会关系帮助企业快速成长方面作用更加突出。本文将创业企业的智力资本划分为人力资本、结构资本、创新资本与社会资本四个组成部分,基于风险投资声誉的视角,探讨风险资本与智力资本的协同关系。结果显示：高声誉风险投资在创业企业人力资本和结构资本两方面的协同效应并不显著,而与创新资本和社会资本两方面的协同效应突出,尤其与社会资本的协同效应能够显著提升创业企业的内在价值。该结论表明高声誉的风险投资机构亟需对目标企业的人力资源、战略规划等方面积极关注,并提供更多的增值服务。     

社交网络中网络口碑与购买意愿的动力学机制分析

网络口碑对消费者的购买意愿有重要的影响。采用系统的观点来研究社交网络中网络口碑与消费者购买意愿的动力学机制。从社会资本的角度出发,采用系统动力学,建立社会资本——网络口碑——购买意愿的动力学模型。模型的仿真结果表明,社会资本在社会化电子商务平台中,能够很好地提升网络口碑的传播效果,进而影响消费者的购买意愿。