Xu S.,Xinyu University
IOP Conference Series: Earth and Environmental Science | Year: 2017
Two carbon fibers were first fabricated by one-step pyrolysis of papers (filter paper and facial tissue), and then employed as catalytic materials for counter electrodes in dye-sensitized solar cells (DSCs) to investigate their potential application. The results show that the microstructure transformation and main weight loss of both the papers are mainly happened in the temperature range of 300-400 °C. After pyrolysis at 800°C, the weight remaining of the filter paper and facial tissue is 1.92% and 4.95%, respectively. The obtained carbon fibers belong to an amorphous carbon consisting of the randomly oriented stacks of graphene sheets. The diameters of both the carbon fibers are about 10 μm, on which there are a certain amount of fine carbon nanofibers. The amorphous microstructure and unique fine nanofibers of the carbon fibers induce more excellent catalytic activity for triiodide ion reduction compared with the biochar (derived from poplar leaf) and the graphite. As a result, the carbon fiber based DSCs display obviously higher efficiency than the biochar or graphite based ones. The conversion efficiency of the DSCs employing the filter paper derived carbon fiber, facial tissue derived carbon fiber, biochar and graphite is 4.72%, 4.70%, 1.33% and 0.77%, respectively. © Published under licence by IOP Publishing Ltd.
Liu J.,Xinyu University
Applied Physics A: Materials Science and Processing | Year: 2017
NPB usually is used as a hole-transport layer in OLED. In fact, it is a standard pure blue-emission material. However, its light-emitting efficiency in OLED is low due to emissive nature of organic material. Herein, a deep-blue OLDE based on NPB was fabricated. The light-emitting efficiency of the device demonstrates a moderate value, and efficiency roll-off is little under high current density. The device demonstrates that the electroplex’s emission decreases with increasing electric field intensity. © 2017, Springer-Verlag Berlin Heidelberg.
Wang F.,Xinyu University |
Wang F.,Nanchang University |
Liu Y.,Nanchang University
Materials and Design | Year: 2014
The purpose of the present work was to investigate and compare the mechanical and tribological behaviors of ceramic-matrix friction material (CMFM) with steel fiber (SF), mullite fiber (MF), and mixing SF and MF. The CMFM was prepared by hot-pressing sintering, and the tribological behaviors were determined using a constant speed friction tester. The worn surfaces and wear debris were observed by a scanning electron microscopy (SEM). Experiment results show that the combination of SF and MF can improve the mechanical properties that each single fiber does not have. The sever fade for the specimen reinforced by single MF during the whole friction testing can be attributed to the poor interface cohesive strength between MF and matrix. Mixing the SF and MF can improve the friction stability, and the friction coefficients for friction material with a mixture of the SF and MF increases with increasing MF content. For all specimens, increasing in the friction temperatures result in the increase of wear rates. © 2014 Elsevier Ltd.
Kong Q.-R.,Xinyu University
Journal of Computational and Theoretical Nanoscience | Year: 2016
With the development of modern lasers technology and theories in atmospheric detection with laser, the technique of atmospheric detection with laser develops rapidly, and is increasingly applied to a number of military and civil fields. For this reason, the novel design and implementation technologies are proposed to the photoelectric detection system of gating photomultiplier tubes. Experimental results suggest that the proposed design and implementation technologies are feasible and effective. This study is helpful to the further development of atmospheric detection with laser. Copyright © 2016 American Scientific Publishers All rights reserved.
Zhang F.,Xinyu University
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2012
Optical properties of acidic texturing of multicrystalline silicon wafer were simulated by solving the Maxwell and material equations, using RF MODULE of COMSOL Multiphysics version 3.5a. The varying laws of surface electric field z component, surface magnetic field y component and reflectivity of initial and acidic textured wafer were obtained. It is found that the numerical values of surface electric field z component and surface magnetic field y component of acidic textured wafer are larger than those of initial wafer. When wavelengh is 600 nm, maximum value and minimum value of surface electric field z component of acidic textured wafer are 3.2 times, 3.5 times than those of initial wafer, respectively and two extremum value of surface electric field z component is about 7.5 times than those of initial wafer. Reflectivity of initial wafer is relatively high, and reflectivity of acidic textured wafer is obviously small because of the better light trapping. Change trend of numerical simulation results are accorded with that of experimental ones, which provided theory bases for the practice production of acidic texturing of multicrystalline silicon wafer.
Liu J.,Xinyu University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015
Abstract 2,6-Di(1H-benzo[d]imidazol-2-yl)pyridine (DBIP) was synthesized. The single-crystal structure of DBIP was resolved. DBIP-based OLED was fabricated. The electroluminescence for the device corresponds to a pure white emission. In addition, thermal stability, UV-vis, photoluminescence and electrochemical behaviors of DBIP were investigated as well. © 2015 Elsevier B.V. All rights reserved.
Qiuxiang T.,Xinyu University
Advances in Information Sciences and Service Sciences | Year: 2012
We present in this paper a conception of DCSK modulator, our subject is to optimise our modulator to implement it in specific circuit. We present a new application of DCSK modulation in image transmission. We introduce also this modulator with coherent detection algorithm. We have presented a comparison between BPSK and DCSK. This is due to the fact that traditional encryption is based on discrete number theory. In this paper we study the performance of Differential Chaos Shift Key (DCSK) modulation and we compare it to BPSK modulation, a new application of DCSK modulation is presented (transmission of the image).
Zhang F.-Y.,Xinyu University
Guangzi Xuebao/Acta Photonica Sinica | Year: 2012
Optical properties of trap pit morphology of multicrystalline silicon (weaklyetched, normaletched and heavyetched) were simulated by solving the Maxwell and material equations, using RF MODULE of COMSOL Multiphysics version 3.5a. The varying laws of surface electric field a component, surface magnetic field y component and reflectivity of three kinds of trap pits were obtained. It is indicated that the value of surface electric field z component and surface magnetic field y component of weaklyetched trap pit is the least, and its reflectivity is the highest (about 35%) at wavelengh of 600 nm; followed by that of normaletched trap pit, its reflectivity is about 17%; the value of surface electric field z component and surface magnetic field y component of heavyetched trap pit is the most, its reflectivity is the lowest (about 10%). Compared the experimental date with the simulation results, change trend of numerical simulation results are accorded with that of experimental ones, which provided for the practice production of acidic texturing of multicrystalline silicon as theory bases.
Wang C.P.,Xinyu University
Applied Mechanics and Materials | Year: 2014
Since the mobile radio communication in a wireless mobile environment, which inevitably subject to fading and interference effects of the various signals, multipath and time-domain signal to bring the mobile domain and frequency dispersion problems, bandwidth resources restricted and transmission delay increases and so on. In this paper, the use of Class R-Tree data structure to store the data on the basis of historical trajectory, the update query results by the beach line iterative way to solve the problem of nearest neighbor queries efficiently update existing intermediate results. © (2014) Trans Tech Publications, Switzerland.
Kong Q.,Xinyu University
Key Engineering Materials | Year: 2016
Composite sol with spinnability was prepared from an aqueous solution using polyvinyl butyral (PVB), Al(NO3)3·9H2O (AN) and tetraethylorthosilicate (TEOS) via non-hydrolytic sol-gel method. The mullite fibers with good flexibility were also obtained. The viscosity of composite sol increased with the increasing PVB content, water-bathing temperature and aging time. FTIR spectroscopy of composite gel showed a new absorption peak due to the C=O group, which implied the presence of new reaction product. It could be explained by the reaction among PVB, AN and TEOS. © 2016 Trans Tech Publications, Switzerland.