Search

Your search keyword '"Xiaoying Niu"' showing total 7 results
Start Over Author "Xiaoying Niu" Publisher wiley
7 results on '"Xiaoying Niu"'

1. Causes and Effects of the Long‐Range Dispersion of Carbonaceous Aerosols From the 2019–2020 Australian Wildfires

Author

Dongyou Wu, Xiaoying Niu, Ziqi Chen, Yang Chen, Yuxuan Xing, Xiaoyi Cao, Jun Liu, Xin Wang, and Wei Pu

Subjects
Geophysics. Cosmic physics, QC801-809
Abstract

Abstract Australia experienced record‐breaking wildfires during 2019–2020, which emitted large amounts of carbonaceous aerosols (CAs) to the atmosphere. In this study, we explored the atmospheric dynamics and thermodynamic mechanism of the long‐range transport of CAs during November 2019–February 2020. The results indicate that the emitted CAs had a ternary advective spreading pattern across the Pacific Ocean in the Southern Hemisphere (SH), influenced mainly by the westerlies and anticyclonic systems. Upward vertical motion over the convergence zone and heat released from smoke pyro‐cumulonimbus clouds and strong light absorption of CAs provided strong vertical lift as the predominant injection pathway of the CAs into the stratosphere in the central Pacific Ocean in the SH. The abundant tropospheric CAs induced atmospheric heating (and potentially surface cooling), with increasing air temperature and decreasing of surface temperature. The anomalous thermal structure led to changes in atmospheric circulation, which weakened the upward vertical motion.

Published
2022
Full Text
View/download PDF

2. Opposite Effects of Mineral Dust Nonsphericity and Size on Dust‐Induced Snow Albedo Reduction

Author

Tenglong Shi, Cenlin He, Daizhou Zhang, Xuelei Zhang, Xiaoying Niu, Yuxuan Xing, Yang Chen, Jiecan Cui, Wei Pu, and Xin Wang

Subjects
dust radius, dust shape, dust type, snow albedo, parameterization, Geophysics. Cosmic physics, QC801-809
Abstract

Abstract We quantified the combined effects of mineral dust nonsphericity and size on snow albedo reduction using the MOPSMAP (Modeled optical properties of ensembles of aerosol particles) package and SAMDS (Spectral Albedo Model for Dirty Snow) with the consideration of dust from Sahara, Greenland, San Juan Mountains, and Tibetan Plateau. Results indicate that the dust‐induced albedo reduction decreases by up to 30% as the effective radii of dust particles increase in 1–5 μm. Nonspherical dust enhances snow albedo reduction relative to spherical dust by up to 20%. Stronger enhancements are obtained for higher dust concentration and larger dust size. Furthermore, the dust nonsphericity‐induced enhancement of snow albedo reduction is more pronounced for more‐absorptive dust. Finally, we develop a new parameterization for quantifying the dependence of snow albedo reduction on dust nonsphericity and size, and provide a convenient way for assessing the climate impacts of dust in snow.

Published
2022
Full Text
View/download PDF

5. One-step synthesis of nitrogen, boron co-doped fluorescent carbon nanoparticles for glucose detection

Author

Meijuan Liang, Yi Ren, Haijuan Zhang, Yunxia Ma, Xingguo Chen, and Xiaoying Niu

Subjects
inorganic chemicals, Nitrogen, Carbon Nanoparticles, Inorganic chemistry, Biophysics, chemistry.chemical_element, One-Step, 02 engineering and technology, Urine, 010402 general chemistry, 01 natural sciences, Chemistry Techniques, Analytical, Fluorescence, chemistry.chemical_compound, Diabetes Mellitus, Humans, Boron, Solid-Phase Synthesis Techniques, Detection limit, 021001 nanoscience & nanotechnology, Boronic Acids, 0104 chemical sciences, Glucose, chemistry, Chemistry (miscellaneous), Nanoparticles, Surface modification, 0210 nano-technology, Boronic acid
Abstract

Heteroatom-doped carbon nanoparticles (CNPs) have attracted considerable attention due to an effective improvement in their intrinsic properties. Here, a facile and simple synthesis of nitrogen, boron co-doped carbon nanoparticles (NB-CNPs) from a sole precursor, 3-aminophenylboronic acid, was performed via a one-step solid-phase approach. Because of the presence of boronic acid, NB-CNPs can be used directly as a fluorescent probe for glucose. Based on a boronic acid-triggered specific reaction, we developed a simple NB-CNP probe without surface modification for the detection of glucose. When glucose was introduced, the fluorescence of NB-CNPs was suppressed through a surface-quenching states mechanism. Obvious fluorescence quenching allowed the highly sensitive determination of glucose with a limit of detection of 1.8 μM. Moreover, the proposed method has been successfully used to detect glucose in urine from people with diabetes, suggesting potential application in sensing glucose.

Published
2017
Full Text
View/download PDF

6. Probing the mechanism of the interaction between<scp>l</scp>-cysteine-capped-CdTe quantum dots and Hg2+using capillary electrophoresis with ensemble techniques

Author

Laifang Xu, Tao Yi, Hongli Chen, Xingguo Chen, Yinyin Xu, Xiaoying Niu, Cuiling Ren, and Junjie Hao

Subjects
Spectrometry, Mass, Electrospray Ionization, Metal ions in aqueous solution, Clinical Biochemistry, technology, industry, and agriculture, Analytical chemistry, Electrophoresis, Capillary, chemistry.chemical_element, Mercury, equipment and supplies, Photochemistry, Biochemistry, Fluorescence, Analytical Chemistry, Electrophoresis, Capillary electrophoresis, chemistry, Dynamic light scattering, Quantum dot, Quantum Dots, Cadmium Compounds, Zeta potential, Cysteine, Tellurium
Abstract

A good understanding of the mechanism of interaction between quantum dots (QDs) and heavy metal ions is essential for the design of more effective sensor systems. In this work, CE was introduced to explore how l-cysteine-capped-CdTe QDs (l-cys-CdTe QDs) interacts with Hg(2+) . The change in electrophoretic mobility can synchronously reflect the change in the composition and property of QDs. The effects of the free and capping ligands on the system are discussed in detail. ESI-MS, dynamic light scattering (DLS), zeta potential, and fluorescence (FL) were also applied as cooperative tools to study the interaction mechanism. Furthermore, the interaction mechanism, which principally depended on the concentration of Hg(2+) , was proposed reasonably. At the low concentration of Hg(2+) , the formation of a static complex between Hg(2+) and the carboxyl and amino groups of l-cys-CdTe QDs surface was responsible for the FL quenching. With the increase of Hg(2+) concentration, the capping l-cys was stripped from the surface of l-cys-CdTe QDs due to the high affinity of Hg(2+) to the thiol group of l-cys. Our study demonstrates that CE can reveal the mechanism of the interaction between QDs and heavy metal ions, such as FL quenching.

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results