Capital Normal University

About: Capital Normal University is a education organization based out in Beijing, China. It is known for research contribution in the topics: Terahertz radiation & Quantum entanglement. The organization has 11441 authors who have published 11988 publications receiving 159071 citations. The organization is also known as: Shǒudū Shīfàn Dàxué.

Interaction of Rarefaction Waves of the Two-Dimensional Self-Similar Euler Equations

Abstract: We construct classical self-similar solutions to the interaction of two arbitrary planar rarefaction waves for the polytropic Euler equations in two space dimensions. The binary interaction represents a major type of interaction in the two-dimensional Riemann problems, and includes in particular the classical problem of the expansion of a wedge of gas into vacuum. Based on the hodograph transformation, the method employed here involves the phase space analysis of a second-order equation and the inversion back to (or development onto) the physical space.

Topological Anderson Insulator in Three Dimensions

Abstract: We show that disorder, when sufficiently strong, can transform an ordinary metal with strong spin-orbit coupling into a strong topological "Anderson" insulator, a new topological phase of quantum matter in three dimensions characterized by disordered insulating bulk and topologically protected conducting surface states.

Position and orientation of the westerly jet determined Holocene rainfall patterns in China.

Abstract: Proxy-based reconstructions and modeling of Holocene spatiotemporal precipitation patterns for China and Mongolia have hitherto yielded contradictory results indicating that the basic mechanisms behind the East Asian Summer Monsoon and its interaction with the westerly jet stream remain poorly understood. We present quantitative reconstructions of Holocene precipitation derived from 101 fossil pollen records and analyse them with the help of a minimal empirical model. We show that the westerly jet-stream axis shifted gradually southward and became less tilted since the middle Holocene. This was tracked by the summer monsoon rain band resulting in an early-Holocene precipitation maximum over most of western China, a mid-Holocene maximum in north-central and northeastern China, and a late-Holocene maximum in southeastern China. Our results suggest that a correct simulation of the orientation and position of the westerly jet stream is crucial to the reliable prediction of precipitation patterns in China and Mongolia.

Colorimetric sensor array based on gold nanoparticles: design principles and recent advances

Abstract: A sensor array based on the pattern recognition strategy is good at distinguishing subtle changes of extremely similar mixtures over a wide range of analyte types. Particularly, colorimetric sensor arrays based on gold nanoparticles (AuNPs) have been applied widely in many fields for its simplicity, rapidity, cost-effective production, multi-information output, easy visualization of the color change, and even assay by naked eyes. This comprehensive review focuses on the development and state of the art of AuNPs-based colorimetric sensor arrays. Firstly, this review briefly describes the principle of a sensor array and discusses the design of the cross-reactive sensing elements. Secondly, the popular chemometric and statistical techniques (including hierarchical cluster analysis (HCA), principal component analysis (PCA), and linear discriminant analysis (LDA)) for analyzing the data from a sensor array have also been presented. Thirdly, a variety of applications of AuNPs-based colorimetric sensor arrays published throughout the literature have been reviewed in detail according to different sensing mechanisms (surface plasmon resonance, catalytic activity of mimetic enzyme, and multidimensional information) between AuNPs and target analytes. Finally, the remaining challenges and future trends in the development of colorimetric sensor array based on AuNPs have also been discussed.