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Pan N.,Northeast Forestry University | Zhang B.,Heilongjiang Institute of Technology | Cao J.,Northeast Forestry University
Nonlinear Analysis: Real World Applications | Year: 2017

In this paper we study the existence of a global solution for a diffusion problem of Kirchhoff type driven by a nonlocal integro-differential operator. As a particular case, we consider the following parabolic equation involving the fractional p-Laplacian: {∂tu+[u]s,p (λ−1)p(−Δ)p su=|u|q−2u,in Ω×R+,∂tu=∂u/∂t,u(x,0)=u0(x),in Ω,u(x,t)=0,in (RN∖Ω)×R0 +, where [u]s,p is the Gagliardo p–seminorm of u, Ω⊂RN is a bounded domain with Lipschitz boundary ∂Ω, p

Binlin Z.,Heilongjiang Institute of Technology | Bisci G.M.,Universitamediterranea Of Reggio Calabria | Servadei R.,Urbino University
Nonlinearity | Year: 2015

In this paper we study the existence of infinitely many weak solutions for equations driven by nonlocal integrodifferential operators with homogeneous Dirichlet boundary conditions. A model for these operators is given by the fractional Laplacian where s ∈ (0, 1) is fixed. We consider different superlinear growth assumptions on the nonlinearity, starting from the well-known Ambrosetti-Rabinowitz condition. In this framework we obtain three different results about the existence of infinitely many weak solutions for the problem under consideration, by using the Fountain Theorem. All these theorems extend some classical results for semilinear Laplacian equations to the nonlocal fractional setting. © 2015 IOP Publishing Ltd & London Mathematical Society.

Zhang H.,Harbin Institute of Technology | Chen G.,Harbin Institute of Technology | He X.,Harbin Institute of Technology | Xu J.,Heilongjiang Institute of Technology
Journal of Alloys and Compounds | Year: 2012

Recently, ion-codoped semiconductor systems have been employed as photocatalysts with the objective of improving their photocatalytic activities under visible-light irradiation. In this paper, the effects of monovalence silver ion and trivalence lanthanum codoping into the photocatalytic activity of CaTiO 3 powder for overall water splitting were studied experimentally and theoretically. Pure and Ag-La codoped CaTiO 3 powder, prepared by sol-gel method which is assisted with ultrasonic technique for the first time, is further characterized by ultraviolet-visible (UV-vis) absorption spectroscopy. The UV-vis spectra indicate that the Ag +-La 3+ ions doping not only enhanced the photocatalytic activity under ultraviolet-visible (λ > 300 nm) light irradiation but also made the photocatalysts have visible light (λ > 400 nm) response. Photocatalytic activity of codoped CaTiO 3 powder for hydrogen evolution under UV light is increased dramatically than that of pure CaTiO 3 powder when the doping amount is 3 mol%. The electronic structures of pure and codoped CaTiO 3 were investigated using density functional theory (DFT). The results of DFT calculation illuminate that the visible-light absorption bands in the Ag-La codoped CaTiO 3 catalyst are attributed to the band transition from the Ag 4d5s to the O 2p + Ti 3d hybrid orbital. © 2011 Elsevier B.V. All rights reserved.

Radulescu V.D.,Institute of Mathematics Simion Stoilow of the Romanian Academy | Radulescu V.D.,University of Craiova | Zhang B.,Heilongjiang Institute of Technology
Nonlinear Analysis: Real World Applications | Year: 2014

Many electrorheological fluids are suspensions of solid particles that are exposed to a strong electric field. This causes a dramatic increase of their effective viscosity. In this paper we are concerned with a mathematical problem that is related with this non-Newtonian behavior. More precisely, we study the nonlinear stationary equation -div(|u|p(x)-2u)+|u|p(x)-2u= f(x,u) in Ω, under Dirichlet boundary conditions, where Ω is a smooth bounded domain in Rn, p>1 is a continuous function, and f(x,u) has a sublinear growth near the origin. Under various natural assumptions, by using the Morse theory in combination with local linking arguments, we obtain the existence of nontrivial weak solutions. © 2013 Elsevier Ltd. All rights reserved.

Li Y.,Heilongjiang Institute of Technology
Lecture Notes in Electrical Engineering | Year: 2016

Traditional timing synchronization methods require the identification of the peak value of the timing metric to realize the synchronization estimation. The proposed method in this paper requires only finding the peak plateau of the time metric and the terminal edge of the peak plateau. Consequently, the time metric of the novel method proposed in this paper could have no sharp peak value. A threshold to process the symbol timing metric in the proposed method must be established, after which it is easy to find the terminal end edge of the peak plateau, thus making the proposed method less complex. © Springer-Verlag Berlin Heidelberg 2016.

Yang C.,Heilongjiang Institute of Technology
Material Science and Environmental Engineering - Proceedings of the 3rd annual 2015 International Conference on Material Science and Environmental Engineering, ICMSEE 2015 | Year: 2016

Understanding pressure-driven flow into capillary is important in microcasting technology. We establish experimentally a certain liquid–solid system, or mercury–mica system. The contact angle formed by a drop of liquid on the solid surface is measured using the contact angle meter. It is found that the contact angle decreases by about 20o as the radius of droplet decreases from 0.325 mm to 0.03 mm. The theories for pressure-driven flow are generalized to a nonlinear second-order differential equation, which takes the effects of the external pressure force, the inertial force, and the contact angle into account. The critical external pressure difference is obtained via the differential equation. The influence of contact angle on the critical external pressure difference is significant due to the change of contact angle with drop size, and the difference between the theoretical result and the experimental result at r0 = 0.02 mm is up to 12.5 kPa. © 2016 Taylor and Francis Group, London.

Chen J.,Heilongjiang Institute of Technology
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2016

The quantum chemical calculations and the Marcus charge transfer theory were combined to study the charge transport property for holes and electrons in the terazulene single crystal. The angular resolution anisotropic and average charge mobilities were obtained simultaneously from a set of identical trajectories with random walk technique. Meanwhile, Terazulene showed similar molecular conjugation to naphthodithiophene, which was a good hole transport material. The different types of charge transport for terazulene and naphthodithiophene were analyzed, which provided insight for the influence of the molecular structures on the charge transport from a theoretical viewpoint. © 2016, Higher Education Press. All right reserved.

Cao S.S.,Heilongjiang Institute of Technology
Advanced Materials Research | Year: 2014

The objective of this study is to investigate appropriate configuration used for micro direct methanol fuel cells (DMFCs) We designed grid and spiral flow fields of electrode plate and simulated with ANSYS Using silicon-based micro-electro-mechanical systems (MEMS) technology to fabricate the DMFCs with different flow fields and tested at room temperature Grid flow field can effectively improve methanol mass transport performance and exhibit higher cell efficiency than spiral flow field, demonstrating 13 mAcm-2 and 3.9 mAcm-2 in peak current density respectively and the peak difference of power density is nearly an order of magnitude We tested Cell performance in different concentration methanol and it shows the best performance in concentration 2M © (2014) Trans Tech Publications, Switzerland.

Li X.,Heilongjiang Institute of Technology
Advanced Materials Research | Year: 2012

Based on dynamic data system(DDS) modeling methodology, after transformed a seasonal time series for total electron content(TEC) of the ionosphere into a stationary time series by differencing technique, stationary TEC values are modeled by the autoregressive(AR) model. In order to correct model's systematic errors, authors proposed that AR model is improved by non-parameters introduced to AR model and the ionospheric TEC is predicted using the improved AR model which is called semi-parametric AR model. Preliminary results show that the semi-parametric AR model has a good performance than one of the AR model for short-term TEC prediction while, for relatively long-term TEC prediction, the performance of the semi-parametric AR model is no less than one of AR model. © (2012) Trans Tech Publications.

Zheng Y.,Heilongjiang Institute of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Internet of things (IoT), focusing on providing users with information exchange and intelligent control, attracts a lot of attention of researchers from all over the world since the beginning of this century. IoT is consisted of large scale of sensor nodes and data processing units, and the most important features of IoT can be illustrated as energy confinement, efficient communication and high redundancy. With the sensor nodes increment, the communication efficiency and the available communication band width become bottle necks. Many research work is based on the instance which the number of joins is less. However, it is not proper to the increasing multi-join query in whole internet of things. To improve the communication efficiency between parallel units in the distributed sensor network, this paper proposed parallel query optimization algorithm based on distribution attributes cost graph. The storage information relations and the network communication cost are considered in this algorithm, and an optimized information changing rule is established. The experimental result shows that the algorithm has good performance, and it would effectively use the resource of each node in the distributed sensor network. Therefore, executive efficiency of multi-join query between different nodes could be improved. © 2015 SPIE.

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