Liu J.,Changsha Environmental Protection College
Nature Environment and Pollution Technology | Year: 2017
In recent years, urban and rural industrial parks have been constructed and widely operated. With the development of intensive agricultural production and accelerated urbanization progress, heavy metals enter rural soil through sewage irrigation, sedimentation of atmospheric soot, and landfill treatment. Heavy metals are not easily degraded and transferred by microorganisms. Restoration and renovation of heavy metal-contaminated rural soil have been difficult. Controlling measures of governing soil heavy metal pollution were proposed to analyse causes of rural soil heavy metal pollution in Hunan Province, China. Based on time series data in Hunan during 2000-2014, this study combined features and analysed causes of rural soil heavy metal pollution in Hunan. The main causes of rural soil heavy metal pollution in Hunan are long-term use of sewage irrigation, stacking of solid waste, large discharge of industrial and traffic waste gases, and great application of chemical fertilizers and pesticides. Rural soil heavy metal pollution in Hunan can be effectively controlled by (1) establishing legislative system for soil heavy metal pollution control, (2) perfecting legal institutions of soil heavy metal pollution, (3) completing supporting law-making stipulations for heavy metal pollution control, (4) optimizing accountability mechanism, and (5) innovating environmental supervisory mechanism of heavy metal pollution control. This study is of positive significance to further and sufficiently recognize causes of rural soil heavy metal pollution. This work is also important in establishing and perfecting laws and regulation system for rural soil environment and resource protection in Hunan Province.
Zou M.,Changsha Environmental Protection College |
Lu G.,CAS Beijing Institute of Applied Physics And Computational Mathematics |
Lu G.,Changsha University of Science and Technology |
Lu G.,Hunan Normal University |
And 2 more authors.
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2013
Coherent control of quantum tunnelling is investigated analytically for two bosons held in a driven triple-well potential. In the high-frequency region within resonance, the non-Floquet states with slowly varying populations are constructed by the linear superposition of Floquet solutions. For the non-resonance case with appropriate reduced parameters, we obtain another set of analytical solutions and their numerical correspondences, which exhibits the selective tunnelling effect of atoms. Applying the presented analytical results, a scheme to transport two bosons from the first well to the third is suggested by adjusting the driving parameters. © 2013 IOP Publishing Ltd.
Peng J.Y.,Changsha Environmental Protection College |
Yang R.B.,Agro Environmental Protection Institute
Applied Mechanics and Materials | Year: 2014
The hydrolysis of diquat in deionized water, river water, and ground water were studied by incubation at 25℃ and hydrolysis of diquat at different temperature(10℃, 25℃, and 35℃) in pH9 were investigated in the paper. The degradation was followed by GC. The experimental results indicated that the kinetics process of diquat can be described by the first-order reaction law, the hydrolysis rates of diquat in deionized water, river water, and ground water were almost the same; the pH was a critical factor of the rate of the degradation of diquat in aqueous solutions, diquat was stable in acid water and neutral water, but its hydrolysis easily took place in basic water; the higher temperture was helpful for the hydrolysis process during the range from 283k to 308k in basic water, the activation energy of hydrolysis for diquat was 25.89kJ/mol, activation entropy was –191.81 J/mol.K, and the temperature coefficient was 1.52. © (2014) Trans Tech Publications, Switzerland.
Yu Y.M.,Hunan University |
Zhang J.H.,Hunan University |
Zhang J.H.,Changsha Environmental Protection College |
Xiao C.H.,Hunan University |
And 3 more authors.
Fuel Cells | Year: 2012
Dopamine, a sustainable and cheap raw material, was selected as the carbon and nitrogen sources to synthesize hollow nitrogen-doped carbon microspheres (HNCMS). The obtained HNCMS were used as a non-noble-metal electrocatalyst for oxygen reduction in alkaline solution and show high electrocatalytic activity, excellent long-term stability, and tolerance to crossover effect of methanol. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Ouyang Z.,Changsha Environmental Protection College |
Bai S.,Changsha Environmental Protection College
Polymers and Polymer Composites | Year: 2015
Novel gelatin/sodium alginate (SA) porous scaffolds containing hyaluronic acid (HYA) were fabricated via freeze-drying technique and their in-vitro biocompatibility was investigated. It was demonstrated that the gelatin/SA/HYA composite scaffolds had highly homogeneous and interconnected pores with average pore size ranging from 50 to 400 μm. The extracts of gelatin/SA/HYA with various contents of 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide (EDC) showed no toxicity due to easy removal of excess EDC. Fibroblastic cells attached to the culture plate and showed normal morphology when cultured in the extract of gelatin/SA/HYA hydrogel. The introduction of HYA into the gelatin/SA matrix facilitated the adhesion of fibroblasts in the gelatin/SA/HYA scaffolds. The haemolytic test indicated that the gelatin/SA/HYA composite hydrogel showed no haemolysis. Therefore, the gelatin/SA/HYA composite scaffolds would be suitable for cell adhesion and growth and could offer new and important options for tissue engineering applications. © Smithers Information Ltd., 2015.
Zhao G.,Changsha Environmental Protection College
Acta Crystallographica Section E: Crystallographic Communications | Year: 2015
The title compound, C13H10ClNS, exhibits a trans conformation with regard to the axis of the C - N bond. The benzene and phenyl rings are inclined to one another by 85.06 (8)°. In the crystal, molecules are linked by N - H⋯S=C hydrogen bonds, forming chains along .
Zhang C.Y.,Changsha Environmental Protection College
Applied Mechanics and Materials | Year: 2014
The laboratory is an important part in teaching and research schools, which is an important facility for reaction of school teaching strength and scale.With the continuous improvement of the level of teaching in Colleges and Universities, laboratory work in university teaching position gradually increased, which directly affects the development of practice teaching.According to the traditional artificial management mode,the information-based management mode greatly improves the management of laboratory results, to improve the efficiency of the laboratory, save manpower and practice, thus the sharing of teaching resources to achieve the better.In this paper,it takes analysis and discussion of related problems based on the web technology to design the school laboratory management system. © (2014) Trans Tech Publications, Switzerland.
Zeng Y.-J.,Changsha Environmental Protection College |
Chen M.-H.,Hunan University of Commerce
Applied Mechanics and Materials | Year: 2014
Linear feature detection in digital images is an important low-level operation in computer vision that has many applications. In remote sensing tasks, it can be used to extract roads, railroads, and rivers from satellite or low-resolution aerialimages, which can be used for the capture or update of data for geographic information and navigation systems. In addition, it is useful in medical imaging for the extraction of blood vessels from an X-ray angiography or the bones in the skull from a CT or MRimage. It also can be applied in horticulture for underground plant root detection in minirhizotron images.In this dissertation, a fast and automatic algorithm for linear feature extraction from images is presented. Under the assumption that linear feature is a sequence ofcontiguous pixels where the image intensity is locally maximal in the direction of thegradient, linear features are extracted as non-overlapping connected line segmentsconsisting of these contiguous pixels. © (2014) Trans Tech Publications, Switzerland.
Xiao Y.-G.,Central South University |
Zhang X.-F.,Changsha Environmental Protection College |
Kang Z.-C.,Jinggangshan University
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2010
In order to obtain the distribution rules of fluctuation pressure of train head surface, body-fitted quadrilateral and hexahedron grid was obtained of high speed train head surface based on parameter space mapping approach. The fluctuation pressure caused by streamlined curved surface of train head was calculated with LES (large eddy simulation), the distribution rules of fluctuation pressure were obtained: the fluctuation pressure is local, namely the fluctuation pressure produced at a certain point mainly affects this point, and the influence on other point weakens promptly when it is apart from this point; The frequency band of fluctuation pressure is very wide, and does not have obvious main frequency. The amplitude of fluctuation pressure is greater at low frequency. With the increase of frequency, amplitude drops continuously according to negative index law. The major energy of 1/3 octave band fluctuation pressure focuses on the frequency scope from 20 Hz to 500 Hz. With the increase of train speed, the major energy of frequency spectra has the tendency that moves to high frequency.
Zhang Z.Y.,Changsha Environmental Protection College
Advanced Materials Research | Year: 2014
Based on quantitative analysis of the application and authorization of industrial design in Hunan Province in recent six years, the present study discussed the main factors restricting the development of the industrial design in Hunan Province, and put forward some strategies and suggestions. © (2014) Trans Tech Publications, Switzerland.