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: Computer science & Population. The organization has 6636 authors who have published 18324 publications receiving 327384 citations. The organization is also known as: UM & UMAC.

Posttraumatic stress symptoms and attitude toward crisis mental health services among clinically stable patients with COVID-19 in China.

Abstract: 1. Department of Nursing, Peking Union Medical College Hospital, Beijing, China; 2. Unit of Psychiatry, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macao SAR, China; 3. Center for Cognition and Brain Sciences, University of Macau, Macao SAR, China; 4. Department of Psychiatry, Southern Medical University Nanfang Hospital & Guangdong-Hong Kong-Macao Greater Bay Area Center for Brian Science and Brain-Inspired Intelligence, Guangdong, China; 5. The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital & the Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China; 6. School of Nursing, Hong Kong Polytechnic University, Hong Kong SAR, China

Bank competition and financial stability in Asia Pacific

Abstract: The impact of bank competition on financial stability has been a focus of academic and policy debate over the last two decades and particularly since the 2007–08 global financial crises (Beck, 2008; OECD, 2011). Under the traditional competition-fragility view, banks cannot earn monopoly rents in competitive markets, and this results in lower profits, capital ratios, and charter values. This makes banks less able to withstand demand- or supply-side shocks and encourages excessive risk-taking (Marcus, 1984). Alternatively, the competition-stability view suggests that competition leads to greater stability. A less competitive banking market may lead to more risk-taking if the big banks are deemed too important to fail and as such obtain implicit (or explicit) subsidies via government safety nets (Mishkin, 1999). In addition, banks with more market power tend to charge higher loan rates, which may induce borrowers to assume greater risk leading to greater default. In competitive banking markets loan rates are lower, Too-Big-To-Fail issues and safety net subsidies are smaller, and this results in a positive link between bank competition and stability (Boyd and De Nicolo, 2005). It could also be the case, as noted by Martinez-Miera and Repullo (2010) that bank competition and stability are linked in a non-linear manner, and in a similar vein Berger et al. (2009) argue that competition and concentration may coexist and can simultaneously induce stability or fragility.

Fuzzy Neural Network-Based Adaptive Control for a Class of Uncertain Nonlinear Stochastic Systems

Abstract: This paper studies an adaptive tracking control for a class of nonlinear stochastic systems with unknown functions. The considered systems are in the nonaffine pure-feedback form, and it is the first to control this class of systems with stochastic disturbances. The fuzzy-neural networks are used to approximate unknown functions. Based on the backstepping design technique, the controllers and the adaptation laws are obtained. Compared to most of the existing stochastic systems, the proposed control algorithm has fewer adjustable parameters and thus, it can reduce online computation load. By using Lyapunov analysis, it is proven that all the signals of the closed-loop system are semiglobally uniformly ultimately bounded in probability and the system output tracks the reference signal to a bounded compact set. The simulation example is given to illustrate the effectiveness of the proposed control algorithm.

Culture-Level Dimensions of Social Axioms and Their Correlates across 41 Cultures

Abstract: Leung and colleagues have revealed a five-dimensional structure of social axioms across individuals from five cultural groups. The present research was designed to reveal the culture level factor structure of social axioms and its correlates across 41 nations. An ecological factor analysis on the 60 items of the Social Axioms Survey extracted two factors: Dynamic Externality correlates with value measures tapping collectivism, hierarchy, and conservatism and with national indices indicative of lower social development. Societal Cynicism is less strongly and broadly correlated with previous values measures or other national indices and seems to define a novel cultural syndrome. Its national correlates suggest that it taps the cognitive component of a cultural constellation labeled maleficence, a cultural syndrome associated with a general mistrust of social systems and other people. Discussion focused on the meaning of these national level factors of beliefs and on their relationships with individual level factors of belief derived from the same data set.

Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence

Abstract: The slow bimolecular recombination that drives three-dimensional lead-halide perovskites’ outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 1015 cm−3, defect-states trapping in three-dimensional perovskites competes effectively with the bimolecular radiative recombination. Herein, we overcome this limitation using van-der-Waals-coupled Ruddlesden-Popper perovskite multi-quantum-wells. Injected charge carriers are rapidly localized from adjacent thin few layer (n≤4) multi-quantum-wells to the thick (n≥5) multi-quantum-wells with extremely high efficiency (over 85%) through quantum coupling. Light emission originates from excitonic recombination in the thick multi-quantum-wells at much higher decay rate and efficiency than bimolecular recombination in three-dimensional perovskites. These multi-quantum-wells retain the simple solution processability and high charge carrier mobility of two-dimensional lead-halide perovskites. Importantly, these Ruddlesden-Popper perovskites offer new functionalities unavailable in single phase constituents, permitting the transcendence of the slow bimolecular recombination bottleneck in lead-halide perovskites for efficient electroluminescence. Slow bimolecular recombination in three-dimensional halide perovskites represents a fundamental limitation for electroluminescence efficiency. Using time-resolved spectroscopy Xinget al. demonstrate that this limitation can be overcome by employing van-der-Waals-coupled multiple quantum well structures.