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Tangshan, China

Zhu Y.,Tangshan Normal University
Communications in Computer and Information Science | Year: 2012

Support Vector Machine classification was studied by this article. Kernel function was used on Electrocardiogram (ECG) classification. Classification results show that the support vector machine classification algorithm reduce the complexity of the classification algorithm, and to ensure that the ECG classification accuracy, while the feasibility and effectiveness of the classification of ideas in the ECG classification. © 2012 Springer-Verlag. Source


Li X.-M.,Kunming University of Science and Technology | Liu Q.-H.,Tangshan Normal University
Journal of Crystal Growth | Year: 2016

This paper focusses on the heterogeneous nucleation on the surface with the non-constant curvature. The formation of a spherical nucleus on the ellipsoid of rotation is considered. Following the classical nucleation theory, the work of formation of a critical nucleus on the ellipsoid of rotation has been given, and the effects of geometry sizes and the material properties of the ellipsoid of rotation on the work of formation of a critical nucleus have been obtained. When the geometry size of the substrate is about value of the critical nucleus radius, there may exist twice nucleation on the ellipsoid of rotation for the case of the smaller value of λ and <π/2. As the work of formation of a nucleus has only one extremum (the maximum), the nucleation on the oblate rotational ellipsoid is more easy than on the spherical surface, while nucleation on the prolate ellipsoid of rotation is more difficult than on the spherical surface. Furthermore, if the particles of the ellipsoid are added into the parent phase as nucleation agents or catalysts, for some geometry sizes, they would not have the effects on the heterogeneous nucleation. © 2016 Elsevier B.V. Source


Hou Y.,Tangshan Normal University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2016

The small angle lighting is always a thorny problem in the LED lighting field. The LED lenses and reflectors were important optical devices, which was the key to solve the above problem. So the design of lens and reflectors has been a hot research topic recently. The theory of geometrical optics was used to calculate the coordinates on the lens surface in this paper. Then, the lens model can be constructed based on the coordinates. In order to facilitate understanding, the 30° and 45° lighting lens were taken as examples to introduce the design process. The research findings show that these lenses can concentrate light rays within the predetermined small angles. Furthermore, the efficiency and uniformity are more than 80% and 85% respectively, which can meet the needs of the modern lighting. © 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved. Source


Hou Y.,Tangshan Normal University | Wang G.-Z.,Tangshan College
Optics Communications | Year: 2015

Abstract Traditional single-mode single-polarization (SMSP) fibers are very difficult to produce and their working bandwidths are narrow. So a broadband tunable SMSP fiber device in this paper is designed. Using refractive index-matching coupling method, the fiber can achieve SMSP transmission from 1.25 μm to 1.6 μm. The adjusting range is about 350 nm. It is worth noting that its working wavelength covers 1310 nm and 1550 nm, which are two important communication windows. In addition, by adjusting the refractive index of the fillers, the device can realize the unique switch function, which has great significance for the establishment and application of optical fiber network. © 2015 Elsevier B.V. All rights reserved. Source


Cai M.,Tangshan Normal University
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

The title compound, C8H5BrN2·0.5H2O, is a phthalazine derivative synthesized from 3-bromo-benzene-1,2-dicarbaldehyde and hydrazine. The mol-ecule is essentially planar, the deviation from the mean plane of the phthalazine ring being 0.015 (3) Å. The O atom of the solvent water mol-ecule is situated on a twofold rotation axis. In the crystal, O-H⋯N hydrogen bonds and short N⋯Br [2.980 (3) Å] contacts lead to the formation of a two-dimensional network parallel to (101). Source

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