Zhu Y.-R.,Anhui University of Technology |
Yin L.-C.,Mudanjiang Normal College |
Yi T.-F.,Anhui University of Technology |
Liu H.,Harbin Institute of Technology |
And 2 more authors.
Journal of Alloys and Compounds | Year: 2013
Submicron-sized Li4Ti5O12 anode was synthesized through a two-step solid-state reaction. The relationship between the structural properties, electrochemical performance discharged to 0 V and lithium-ion intercalation kinetics was discussed using the experiments as well as the first-principles calculations. Structural analyses reveal that Li 4Ti5O12 synthesized by the two-step solid-state method has high phase purity. Scanning electron microscopy (SEM) shows that Li4Ti5O12 has a homogeneous size distribution in the range of 0.4-0.6 μm. The initial discharge capacity of Li 4Ti5O12 is 234.6 mA h g-1 at 0.5 C rate between 0 and 2.5 V, and it is close to the theoretical capacity value. The high structure stability of Li4Ti5O12 is related to the strong covalent bonding characteristic between Ti and O according to the first-principles calculation. Electrochemical impedance spectroscopy (EIS) indicates that the charge transfer resistance of the Li4Ti 5O12/Li cell evidently decreases with increasing of the temperature, and the apparent activation energies of Li4Ti 5O12 electrode on the lithium diffusion process and the charge transfer are calculated to be 19.05 and 22.48 kJ mol-1, respectively. © 2012 Elsevier B.V. All rights reserved.
Sun F.,Heilongjiang University |
Sun F.,Mudanjiang Normal College |
Li L.,Heilongjiang University |
Liu P.,Harbin Normal University |
Lian Y.,Heilongjiang University
Electroanalysis | Year: 2011
Novel copper (Cu) film composed of pillar-like structure was synthesized on indium-doped tin oxide (ITO) substrate by electrodeposition in acetate bath with proline as additive for the first time and used to construct nonenzymatic glucose sensor. When applied to detect glucose, such prepared electrode showed low operating potential (0.4V), high sensitivity (699.4499μA mM-1 cm-2), and fast response time (<3s) compared with other Cu-based electrodes. In addition, the prepared electrode also offered good anti-interference ability to ascorbic acid, uric acid and acetaminophen. Present study provides new insights into the control of Cu film morphology for sensor fabrication. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Cai X.,Mudanjiang Normal College
Acta Crystallographica Section E: Structure Reports Online | Year: 2011
In the centrosymmetric binuclear title compound, [Ni2(C 15H8O7)2(H2O) 6], the NiII ion is in a distorted octahedral coordination geometry with O6 donors, three from three water molecules, the others from three carboxylate groups of two ligands. Extensive O-H⋯ ⋯ ⋯O hydrogen bonding connects the molecules into a three-dimensional supramolecular structure.
Wang B.,Mudanjiang Normal College |
Wang L.,Mudanjiang Normal College
Proceedings - 4th International Conference on Computational and Information Sciences, ICCIS 2012 | Year: 2012
Artificial Bee Colony(ABC) algorithm is a biological-inspired optimization algorithm, which has been shown to be compared with some conventional biological-inspired algorithms, such as Genetic Algorithm(GA), Particle Swarm Optimization(PSO) and Differential Evolution(DE). However, there exists problems such as premature convergence and trapping in local optimal. Inspired by DE, we propose an improved ABC algorithm called pbest-guided ABC (PABC) algorithm by incorporating the information of local best (pbest) solution into the solution search equation to improve the exploitation in the onlookers stage. Moreover, in each iteration, we modify the frequency of perturbation. Finally, we use a more robust calculation to determine and compare the quality of alternative solutions. The experimental results show that PABC algorithm can improve the performance of ABC algorithm. © 2012 IEEE.
Qi D.,University of Science and Technology Beijing |
Zhang L.,University of Science and Technology Beijing |
Zhao L.,University of Science and Technology Beijing |
Cai X.,University of Science and Technology Beijing |
And 2 more authors.
ChemPhysChem | Year: 2012
The three-unit homoaromatic electron-delocalizing nature of the benzo-fused tetra(triptycene)porphyrins (TTPs) with a three-dimensional conjugated model is clarified using density functional theory studies. Due to the electron delocalization, the unidirectional photon-induced current of this kind of TTP molecular skeleton with a highest efficiency of about 90 % in the range between 350 and 500 nm gives them great potential as efficient solar antenna collectors. In addition, their active triptycene cups fused at the central porphyrin core render possible potential application in host-guest chemistry. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Xu H.,Mudanjiang Normal College
Applied Mechanics and Materials | Year: 2011
In this paper, a novel class of Cohen-Grossberg neural networks with inverse Hö lder neuron activation functions is presented. By employing the Brouwer degree properties and linear matrix inequality techniques, the existence and uniqueness of equilibrium point for such Cohen-Grossberg neural networks are investigated. By constructing appropriate Lyapunov functions and using Lyapunov diagonally stable matrices, a sufficient condition which is used to checked the global exponential stability of a unique equilibrium point is established. A numerical example is given to demonstrate the effectiveness of the theoretical results. © (2011) Trans Tech Publications, Switzerland.
Wang H.,Mudanjiang Normal College
Advanced Materials Research | Year: 2011
This paper discusses the development of "Double-qualified" teachers, and put forward several proposals to draw on the existing experience. They are the study in the German dual system, the teachers' access system, the training mode, the assessment mechanism, and the circumstances to construct double-qualified teaching staff and so on. This work has important significance to cultivate high-quality teacher and meet the urgent need of higher vocational schools. © (2011) Trans Tech Publications, Switzerland.
Wang H.,Mudanjiang Normal College
Acta Crystallographica Section E: Structure Reports Online | Year: 2012
The asymmetric unit of the title complex, [Cu 2(C 8H 4NO 6) 2Cl 2(C 10H 8N 2) 2]·2H 2O, contains two half binuclear complex molecules and two solvent water molecules; the complete complex molecule is generated by the application of a centre of inversion in each case. Each independent Cu II cation is penta-coordinated within a distorted square-pyramidal environment defined by a two μ 2-O atoms (derived from two 2-carboxy-5-nitrobenzoato anions), two N atoms (bipyridine ligand) and one Cl. Binuclear species are assembled into a two-dimensional supramolecular architecture parallel to (011̄) by O - H⋯O and O - H⋯Cl hydrogen bonds.
Feng X.,Mudanjiang Normal College
Applied Mechanics and Materials | Year: 2013
The paper is mainly analyzed machine translation system as effective platform using computer and this is a process that a kind of natural source language changes into another source language of natural target. Machine translation system is obviously application effect with increasing demand in today economic and social globalization. The paper is divided into two categories machine translation system, based on regulation and corpus and machine translation system and is summarized and generalized five kind of application type, which machine translation system can better serve the economic and social development. © (2013) Trans Tech Publications Switzerland.
Zheng Y.,Mudanjiang Normal college
Applied Mechanics and Materials | Year: 2012
In this paper, a new dopant of P3N5 (phosphorus nitride) was doped into the diamond growth cell to grow diamond crystals by temperature gradient growth method (TGM) under high pressure and high temperature (HPHT). The experiments were performed at a fixed pressure of about 6.0 GPa and temperatures of 1600-1650 K. The gained diamond crystals were characterized by infrared (IR) absorption spectroscopy, micro-Raman spectroscopy and X-ray photoelectron spectroscopy (XPS), respectively. IR measurements demonstrated that, nitrogen atom was indeed doped into diamond crystals, and the diamond crystals with perfect shape containing nitrogen concentration ranging from 461 atomic parts per million (ppm) to 2186 atomic ppm were successfully synthesized. Nitrogen atoms present in diamond crystal were predominantly in isolated form accompanied by a small amount of nitrogen pairs. Micro-Raman spectra implied that crystalline quality deteriorated with nitrogen concentration gradually increased in diamond-growing environment. The XPS spectra revealed that only a few of phosphorus impurities about tens of ppm level were incorporated into a diamond crystal which was heavily doped with P3N5. This study will promote the application of doping diamonds in micro-electronics field and other fields. © (2012) Trans Tech Publications, Switzerland.