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Taiyuan, China

North University of China is a university based in Taiyuan, Shanxi province, China,which was once called North China Institute of Technology . It was formerly known as Taihang Industrial School,which was founded in September 8, 1941, and renamed Taiyuan Institute of Machinery in 1958. School played an important role in the improvement of the quality of our manpower and weaponry of PLA during the War of Resistance against Japan and the War of Liberation. In 2001, Bo Yibo wrote an inscription "The first school for people's ordnance " at the 60 years' celebration of North China Institute of technology. Wikipedia.

We report recent progress in tuning optical properties and photocatalytic activities of carbon-based quantum dots (carbon-based QDs) through their surface groups. It is increasingly clear that the properties of carbon-based QDs are more dependent on their surface groups than on their size. The present challenge remains as to how to control the type, number, and conformation of the heterogeneous groups on the surface of carbon-based QDs when considering their target applications. By reviewing the related achievements, this personal account aims to help us understand the roles different surface groups play in tuning the properties of carbon-based QDs. A number of significant accomplishments have demonstrated that surface groups possess strong power in engineering electronic structure and controlling photogenerated charge behaviors of carbon-based QDs. However, effective strategies for modifying carbon-based QDs with diverse heterogeneous groups are still needed. Surface group regulation for tuning properties of carbon-based "quantum dots": The photophysical and photochemical properties of carbon and graphene quantum dots are more dependent on their surface groups than on their size. Different heterogeneous groups play different roles in engineering electronic structure and controlling photogenerated charge behaviors of these quantum dots. © 2015 The Chemical Society of Japan & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Wang W.,North University of China
Process Safety and Environmental Protection | Year: 2011

In this paper, functional macromolecule poly (methacrylic acid) (PMAA) was grafted onto the surface of silica gel particles using 3-methacryloxypropyl trimethoxysilane (MPS) as intermedia, and the grafted particle PMAA/SiO 2 with strong adsorption ability for Cd2+ was prepared. The adsorption properties of Cd2+ on the PMAA/SiO2 were investigated with both batch and column methods. The experimental results showed that the PMAA/SiO2 possesses very strong adsorption ability for Cd2+, and the saturated adsorption amount could reach up to 42.6 mg g-1. The equilibrium adsorption data were found to be consistent with the Langmuir isotherm model. pH and temperature have great influence on the adsorption amount. PMAA/SiO2 can be easily regenerated using diluted hydrochloric acid solution as eluent. The PMAA/SiO2 possesses excellent reusability properties as well. © 2010 The Institution of Chemical Engineers. Source

Liu P.-P.,North University of China
Mathematical and Computer Modelling | Year: 2010

An analysis of a reaction-diffusion-migration model of the interaction between prey and predator is presented. I give the analysis of dispersal relation of wave behavior in detail. Moreover, wave number against frequency for different values is given by means of both numerical simulation and nonlinear analysis for derivation of the phase equation. The obtained results show that numerical simulations are in agreement with mathematical analysis. © 2009 Elsevier Ltd. All rights reserved. Source

Sun G.-Q.,North University of China
Nonlinear Dynamics | Year: 2012

One subject of spatial epidemiology is spatial variation in disease risk or incidence. The spread of epidemics can result in strong spatial patterns of such risk or incidence: for example, pathogen dispersal might be highly localized, vectors or reservoirs for pathogens might be spatially restricted, or susceptible hosts might be clumped. Here, spatial pattern of an epidemic model with nonlinear incidence rates is investigated. The conditions for Hopf bifurcation and Turing bifurcation are gained and, in particular, exact Turing domain is found in the two parameters space. Furthermore, numerical results show that force of infection, namely β, plays an important role in the spatial pattern.More specifically, different patterns emerge as β increases. The mathematical analysis and numerical results well extend the finding of pattern formation in the epidemic models and may well explain the field observed in some areas. © Springer Science+Business Media B.V. 2011. Source

Zhang J.,North University of China
PloS one | Year: 2011

Human rabies is one of the major public-health problems in China. The number of human rabies cases has increased dramatically in the last 15 years, partially due to the poor understanding of the transmission dynamics of rabies and the lack of effective control measures of the disease. In this article, in order to explore effective control and prevention measures we propose a deterministic model to study the transmission dynamics of rabies in China. The model consists of susceptible, exposed, infectious, and recovered subpopulations of both dogs and humans and describes the spread of rabies among dogs and from infectious dogs to humans. The model simulations agree with the human rabies data reported by the Chinese Ministry of Health. We estimate that the basic reproduction number [Formula: see text] for the rabies transmission in China and predict that the number of the human rabies is decreasing but may reach another peak around 2030. We also perform some sensitivity analysis of [Formula: see text] in terms of the model parameters and compare the effects of culling and immunization of dogs. Our study demonstrates that (i) reducing dog birth rate and increasing dog immunization coverage rate are the most effective methods for controlling rabies in China; and (ii) large scale culling of susceptible dogs can be replaced by immunization of them. Source

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