University of Macau

About: University of Macau is a education organization based out in Macao, Macau, China. It is known for research contribution in the topics: Population & Control theory. The organization has 6636 authors who have published 18324 publications receiving 327384 citations. The organization is also known as: UM & UMAC.

Controlling N-doping type in carbon to boost single-atom site Cu catalyzed transfer hydrogenation of quinoline

Abstract: Single-atom site (SA) catalysts on N-doped carbon (CN) materials exhibit prominent performance for their active sites being M-Nx. Due to the commonly random doping behaviors of N species in these CN, it is a tough issue to finely regulate their doping types and clarify their effect on the catalytic property of such catalysts. Herein, we report that the N-doping type in CN can be dominated as pyrrolic-N and pyridinic-N respectively through compounding with different metal oxides. It is found that the proportion of distinct doped N species in CN depends on the acidity and basicity of compounded metal oxide host. Owing to the coordination by pyrrolic-N, the SA Cu catalyst displays an enhanced activity (two-fold) for transfer hydrogenation of quinoline to access the valuable molecule tetrahydroquinoline with a good selectivity (99%) under mild conditions. The higher electron density of SA Cu species induced by the predominate pyrrolic-N coordination benefits the hydrogen transfer process and reduces the energy barrier of the hydrogenation pathway, which accounts for the improved catalytic effeciency.

Corporate Social Responsibility Reporting in China: An Overview and Comparison with Major Trends

Abstract: Given the scant literature of corporate social responsibility (CSR) reporting on mainland China, especially in the Western academia, the present paper aims at providing an overview of the CSR reporting requirements in that country A comparison with major reporting trends such as the adoption of GRI-G3 is made to further understand the development of CSR in China A literature review of prior studies is also conducted concerning CSR in China, especially those which are available only in the Chinese language In summary, the overview indicates that CSR reporting in China is at a very preliminary stage and more empirical research in this area is urgently called for Copyright © 2012 John Wiley & Sons, Ltd and ERP Environment

Neural Controller Design-Based Adaptive Control for Nonlinear MIMO Systems With Unknown Hysteresis Inputs

Abstract: This paper studies an adaptive neural control for nonlinear multiple-input multiple-output systems in interconnected form The studied systems are composed of ${N}$ subsystems in pure feedback structure and the interconnection terms are contained in every equation of each subsystem Moreover, the studied systems consider the effects of Prandtl–Ishlinskii (PI) hysteresis model It is for the first time to study the control problem for such a class of systems In addition, the proposed scheme removes an important assumption imposed on the previous works that the bounds of the parameters in PI hysteresis are known The radial basis functions neural networks are employed to approximate unknown functions The adaptation laws and the controllers are designed by employing the backstepping technique The closed-loop system can be proven to be stable by using Lyapunov theorem A simulation example is studied to validate the effectiveness of the scheme

Generation of integration-free neural progenitor cells from cells in human urine

Abstract: Human neural stem cells hold great promise for research and therapy in neural disease. We describe the generation of integration-free and expandable human neural progenitor cells (NPCs). We combined an episomal system to deliver reprogramming factors with a chemically defined culture medium to reprogram epithelial-like cells from human urine into NPCs (hUiNPCs). These transgene-free hUiNPCs can self-renew and can differentiate into multiple functional neuronal subtypes and glial cells in vitro. Although functional in vivo analysis is still needed, we report that the cells survive and differentiate upon transplant into newborn rat brain.