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Xia N.,Anyang University, China | Zhang L.,Anyang University, China
Materials | Year: 2014

MicroRNAs (miRNAs) play important functions in post-transcriptional regulation of gene expression. They have been regarded as reliable molecular biomarkers for many diseases including cancer. However, the content of miRNAs in cells can be low down to a few molecules per cell. Thus, highly sensitive analytical methods for miRNAs detection are desired. Recently, electrochemical biosensors have held great promise as devices suitable for point-of-care diagnostics and multiplexed platforms for fast, simple and low-cost nucleic acid analysis. Signal amplification by nanomaterials is one of the most popular strategies for developing ultrasensitive assay methods. This review surveys the latest achievements in the use of nanomaterials to detect miRNAs with a focus on electrochemical techniques. © 2014 by the authors; licensee MDPI, Basel, Switzerland.


Yuan Y.,Shanghai JiaoTong University | Du W.,Anyang University, China | Qian X.,Shanghai JiaoTong University
Journal of Materials Chemistry | Year: 2012

Homogenous Zn xGa 2O 3+x (0 ≤ x ≤ 1) solid solution nanocrystals were successfully prepared by a solvothermal approach and characterized by X-ray powder diffraction (XRD), X-ray spectra in fluorescence (XRF), transmission electron microscopy (TEM), UV-vis spectroscopy, and X-ray photoelectron spectrum (XPS). XRD pattern analysis revealed that the lattice parameters of Zn xGa 2O 3+x (0 ≤ x ≤ 1) solid solution nanocrystals increased linearly with the increase of ZnGa 2O 4 ratio according to Vegard's law, which confirmed the homogenous structures of these solid solution nanocrystals. UV-vis absorption spectra demonstrated that the band gap of the obtained Zn xGa 2O 3+x solid solution nanocrystals could be precisely tuned in the range of 4.43 to 3.70 eV by elaborately controlling the content of zinc. The emission of Zn xGa 2O 3+x solid solution nanocrystals strengthened and red-shifted gradually with the increase of x value, and ZnGa 2O 4 nanocrystals showed an intense blue emission. XPS results revealed that Zn xGa 2O 3+x binding energy of O 2- 1s increased with the increase of the x value, indicating the decrease of the oxygen vacancies (V o*) of O h sites and the increase of the symmetry of the Ga-O octahedron, which resulted in the emission red-shift of Zn xGa 2O 3+x solid solution. © 2012 The Royal Society of Chemistry.


Wu H.B.,Nanyang Technological University | Pang H.,Anyang University, China | Pang H.,Nanyang Technological University | Lou X.W.,Nanyang Technological University
Energy and Environmental Science | Year: 2013

In this work, we report the facile synthesis of mesoporous nickel cobalt oxide (Ni0.3Co2.7O4) hierarchical structures with excellent supercapacitive performance. Nickel cobalt oxalate hydrate (Ni0.1Co0.9C2O4·nH 2O) is first synthesized as the precursor via a facile precipitation method, followed by controlled annealing to obtain mesoporous Ni 0.3Co2.7O4 hierarchical structures. The sample prepared at a relatively low annealing temperature (400 °C) possesses more abundant mesopores and higher specific surface area, and exhibits excellent supercapacitive performance in aqueous alkaline electrolytes. An exceptionally high specific capacitance of 960 and 805 F g-1 is obtained under current densities of 0.625 and 6.25 A g-1, respectively, with excellent cyclic stability. The remarkable electrochemical performance is attributed to the desirable composition and the unique hierarchical mesoporous architectures. © 2013 The Royal Society of Chemistry.


Yang Y.,Anyang University, China | Yang Y.,Joint Center for Particle
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

Dark matter (DM) annihilation or decay can affect the anisotropy of the cosmic microwave background (CMB). Therefore, the CMB data can be used to constrain the properties of a dark matter particle. In this work, we use the new CMB data obtained by the Planck satellite to investigate the limits on the basic parameters of a dark matter particle. The parameters are the dark matter mass (mχ) and the thermally averaged cross section (σv) for dark matter annihilation and the decay rate (Γ) (or lifetime τ=1/Γ) for dark matter decay. For dark matter annihilation, we also consider the impact of the structure formation process which is neglected by the recent work. We find that for DM annihilation, the constraints on the parameters are fann= σv/mχ<0.16×10-26cm3s-1GeV-1(or fann<0.89×10-6m3s-1kg-1, 95% C.L.). For DM decay, the constraints on the decay rate are Γ<0.28×10-25s-1(95% C.L.). © 2015 American Physical Society.


Wang C.M.,Anyang University, China | Yu F.J.,Anyang University, China
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We investigate the charge conductivity and current-induced spin polarization of the surface state of a three-dimensional topological insulator by including the hexagonal-warping effect of the Fermi surface in both the classical and quantum diffusion regimes. We present general expressions of conductivity and spin polarization, which are reduced to simple forms for the usual scattering potential. Due to the hexagonal warping, the conductivity and spin polarization show an additional quadratic carrier-density dependence both for the Boltzmann contribution and the quantum correction. In the presence of the warping term, the surface states still reveal weak antilocalization. Moreover, the dielectric function in the random phase approximation is also explored, and we find that it may be momentum-angle-dependent. © 2011 American Physical Society.


Wang C.M.,Anyang University, China | Lei X.L.,Shanghai JiaoTong University
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

A positive, nonsaturating, and dominantly linear magnetoresistance is demonstrated to occur in the surface state of a topological insulator having a wave-vector linear energy dispersion together with a finite positive Zeeman energy splitting. This linear magnetoresistance shows up within quite wide magnetic-field range in a spatially homogeneous system of high carrier density and low mobility in which the conduction electrons are in extended states and spread over many smeared Landau levels, and is robust against increasing temperature, in agreement with recent experimental findings in Bi 2Se 3 nanoribbons. © 2012 American Physical Society.


Cui R.,Northwestern Polytechnical University | Gao B.,Northwestern Polytechnical University | Guo J.,Anyang University, China
Autonomous Robots | Year: 2012

This paper investigates the coordination of multiple robots with pre-specified paths, considering motion safety and minimizing the traveling time. A method to estimate possible collision point along the local paths of the robots is proposed. The repulsive potential energy is computed based on the distances between the robots and the potential collision points. This repulsive potential energy is used as the cost map of the probabilistic roadmap (PRM), which is constructed in the coordination space for multiple robots taking into account both motion time cost and safety cost. We propose a search method on the PRM to obtain the Pareto-optimal coordination solution for multiple robots. Both simulation and experimental results are presented to demonstrate the effectiveness of the algorithms. © 2011 Springer-Verlag.


Wang N.,Guangxi Normal University | Tian J.,Anyang University, China | Scheid W.,Justus Liebig University
Physical Review C - Nuclear Physics | Year: 2011

The fusion probability in "hot" fusion reactions leading to the synthesis of superheavy nuclei is investigated systematically. The quasifission barrier influences the formation of the superheavy nucleus around the "island of stability" in addition to the shell correction. Based on the quasifission barrier height obtained with the Skyrme energy-density functional, we propose an analytical expression for the description of the fusion probability, with which the measured evaporation residual cross sections can be reproduced acceptably well. Simultaneously, some special fusion reactions for synthesizing new elements 119 and 120 are studied. The predicted evaporation residual cross sections for 50Ti+249Bk are ∼10-150 fb at energies around the entrance-channel Coulomb barrier. For the fusion reactions synthesizing element 120 with projectiles 54Cr and 58Fe, the cross sections fall to a few femtobarns, which seems beyond the limit of the available facilities. © 2011 American Physical Society.


Wang C.M.,Anyang University, China | Lei X.L.,Shanghai JiaoTong University
Physical Review B - Condensed Matter and Materials Physics | Year: 2013

A balance-equation scheme is developed to investigate the magnetotransport in a dc current biased graphene. We examine the Shubnikov-de Haas oscillation under a nonzero bias current. With an increase in the current density, the oscillatory differential resistivity exhibits phase inversion, in agreement with recent experimental observation. In the presence of surface optical phonons, a second phase inversion may occur at higher dc bias due to the reduced influence of electron heating and the enhanced direct effect of current on differential magnetoresistivity. We also predict the appearance of current-induced magnetoresistance oscillation in suspended graphene at lower magnetic fields and larger current densities. For the graphene mobility currently available (≈20 m2/V s), the oscillatory behavior may be somewhat altered by magnetophonon resonance arising from intrinsic acoustic phonon under finite bias current conditions. © 2013 American Physical Society.


Li G.,Anyang University, China | Jia C.,Anyang University, China | Sun K.,Anyang University, China
Organic Letters | Year: 2013

C-H, N-H dehydrogenative coupling of quinoline N-oxides with lactams/cyclamines has been achieved in the presence of the Cu(OAc)2 catalyst to give good to excellent yields. This study provides a new strategy for the construction of a 2-aminoquinoline skeleton via direct functionalization of aryl C-H bonds. © 2013 American Chemical Society.

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