A PI controller configuration for robust control of a class of nonlinear systems

The PI control configuration for stabilization and signal tracking of nonlinear systems is investigated. Semiglobal asymptotic stability and semiglobal practical signal tracking of the controlled system are proven using results from the theory of nonlinear singularly perturbed systems.     

高功率Ni/MH电池用AB5型负极储氢合金的研究

研究和开发具有优异高倍率特性的储氢电极合金是发展高功率型Ni/MH电池的技术关键,具有重大的理论意义和商业价值。基于合金热力学和动力学行为的讨论,研究了AB5型储氢电极合金的微结构对其倍率放电性能的影响。结果表明,由于非化学计量(B/A >5 )和高催化活性第二相的引入,B侧添加硼或钼可以显著提高合金的高倍率放电容量和低温放电容量。进一步结合A侧稀土成分优化,发展出一类具有优异倍率性能的MmNi3.55Co0.75Mn0.4Al0.3Bx(Mm为混合稀土)合金。该系列合金有望应用于高功率Ni/MH电池和低温( - 35 oC)Ni/MH电池。     

A K+-sensitive AND-gate dual-mode probe for simultaneous tumor imaging and malignancy identificationOA

Although molecular imaging probes have the potential to non-invasively diagnose a tumor,imaging probes that can detect a tumor and simultaneously identify tumor malignancy remain elusive.Here,we demonstrate a potassium ion(K+) sensitive dual-mode nanoprobe(KDMN) for non-invasive tumor imaging and malignancy identification,which operates via a cascaded ’AND’ logic gate controlled by inputs of magnetic resonance imaging(MRI) and fluorescence imaging(FI) signals.We encapsulate commercial K⁺     

A test for robust Hurwitz stability of convex combinations of complex polynomials

In this paper we present a method for testing the Hurwitz property of a segment of polynomials (1−λ)p₀(s)+λp₁(s), where λ∈[0,1] and p₀(s) and p₁(s) are nth-degree polynomials with complex coefficients. The method consists in constructing a parametric Routh-like array with polynomial entries and generating Sturm sequences for checking the absence of zeros of two real λ-polynomials of degrees 2 and 2n in the interval (0,1). The presented method is easy to implement. Moreover, it accomplishes the test in a finite number of arithmetic operations because it does not invoke any numerical root-finding procedure.     

New robust delay-dependent stability and H∞ analysis for uncertain Markovian jump systems with time-varying delays

This paper deals with the problems of robust delay-dependent stability and H_∞ analysis for Markovian jump linear systems with norm-bounded parameter uncertainties and time-varying delays. In terms of linear matrix inequalities, an improved delay-range-dependent stability condition for Markovian jump systems is proposed by constructing a novel Lyapunov-Krasovskii functional with the idea of partitioning the time delay, and a sufficient condition is derived from the H_∞ performance. Numerical examples are provided to demonstrate efficiency and reduced conservatism of the results in this paper.     

企业吸收能力对“引智”学习的影响研究——珠江钢琴纵向案例研究

通过一家钢琴制造企业的纵向案例分析,试图分析中国企业在其不同技术发展阶段,如何选择与自身吸收能力相匹配的"引智"学习方式,并在两者互动中提升企业创新绩效。研究发现:第一,在企业选择"引智"学习方式过程中,企业知识吸收能力演化(识别与获取能力—理解与消化能力—转化和应用能力)扮演了重要的角色,两者动态匹配机制为"识别与获取能力—问题导向学习;理解与消化能力—项目导向学习;转化和应用能力—内部前馈式学习"。第二,企业"引智"学习能够明显提升企业知识吸收能力,而后者又会影响企业下阶段"引智"学习方式的选择。第三,选择与企业吸收能力相匹配的"引智"学习方式,可显著提升企业创新绩效。     

用户嵌入程度对企业创新绩效影响机制研究—以数字内容产业为例

以数字内容产业为例,深入探讨用户深度嵌入和浅度嵌入对企业创新绩效的影响机制,并提出吸收能力在用户嵌入模式下对企业创新绩效影响的中介作用.