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Chai L.,Central South University | Wang J.,Central South University | Wang J.,Wuhan University of Technology | Wang H.,Central South University | And 4 more authors.
Nano Energy | Year: 2015

Graphene-embedded carbon fiber (GFC) film has been fabricated by using filamentous fungus (Aspergillus niger) as carbonizable fibers to drive the graphene nanosheets to embed in the hyphae network system and then carbonizing at 700°C. The molecular structure of the GFC film is primarily composed of aromatic components, and the film is doped by N (8.62%) and O (8.12%) elements. The conductivity of the final product reaches as high as 0.71Scm-1. The GFC film serves as the conductive interlayer to greatly improve the performance of Li-S batteries including capacity retention and rate capability. By inserting the GFC film, the battery can deliver a capacity of ~700mAh g-1 after 300 cycles at 1C. Even performed at 5C, it is able to deliver a reversible capacity of more than 650mAhg-1. This research presents a facile and effective method for the fabrication of superior macroscopic carbon monolith, which holds great potential in other forms of electrochemical energy storage. © 2015 Elsevier Ltd. Source

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. Source

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. Source

Lu G.,Changsha University of Science and Technology | Lu G.,Hunan Normal University | Hai W.,Hunan Normal University | Zou M.,Changsha Environmental Protection College
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2012

We investigate the coherent manipulation of quantum tunnelling for a single atom held in a driven planar four-well potential with diagonal coupling. In the high-frequency regime, the non-Floquet states with slowly varying populations are constructed by the linear superposition of Floquet solutions. Based on the analytical results, the effect of the selective coherent destruction of tunnelling is exhibited and the two-pathway switching scheme is suggested by adjusting the driving parameters. © 2012 IOP Publishing Ltd. Source

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. Source

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