Positive ground state of coupled planar systems of nonlinear Schrödinger equations with critical exponential growth

In this paper, we prove the existence of a positive ground state solution to the following coupled system involving nonlinear Schrödinger equations: −∆u + V1(x)u = f1(x, u) + λ(x)v, x ∈ R2 −∆v + V2(x)v = f2(x, v) + λ(x)u, x ∈ R2 where λ, V1, V2 ∈ C(R2 ,(0, +∞)) and f1, f2 : R2 × R → R have critical exponential growth in the sense of Trudinger–Moser inequality. The potentials V1(x) and V2(x) satisfy a condition involving the coupling term λ(x), namely 0 < λ(x) ≤ λ0 p V1(x)V2(x). We use non-Nehari manifold, Lions’s concentration compactness and strong maximum principle to get a positive ground state solution. Moreover, by using a bootstrap regularity lifting argument and L q -estimates we get regularity and asymptotic behavior. Our results improve and extend the previous results

Correction of "Cloud Removal By Fusing Multi-Source and Multi-Temporal Images"

Remote sensing images often suffer from cloud cover. Cloud removal is required in many applications of remote sensing images. Multitemporal-based methods are popular and effective to cope with thick clouds. This paper contributes to a summarization and experimental comparation of the existing multitemporal-based methods. Furthermore, we propose a spatiotemporal-fusion with poisson-adjustment method to fuse multi-sensor and multi-temporal images for cloud removal. The experimental results show that the proposed method has potential to address the problem of accuracy reduction of cloud removal in multi-temporal images with significant changes.Comment: This is a correction version of the accepted IGARSS 2017 conference pape

Push and Pull Factors Influencing the Level of Participation of Leisure Skiing in China

Traditionally, winter sports have very limited accessibility and popularity in China. In addition to the growing economy in China and increased affordability by Chinese consumers, obtaining the hosting rights for the 2022 Beijing/Zhangjiakou Winter Olympic Games has brought a heightened opportunity for China to build up facilities and related infrastructures, develop and provide programs, promote interests and participation, and advance business operations of winter sports. Although more people are participating in winter sports today, especially in skiing, many of the newly constructed facilities are often operated in financial deficit and relying on governmental subsidy. Understanding the reasons that cause and channel winter-sport participation would help sport managers to improve program functions and services in an effort to meet or exceed consumer expectations. The purpose of this study was to examine push (i.e., socio-motivation) and pull (i.e., external motivation) factors influencing the level of participation of leisure skiing in China. Based on a comprehensive review of literature (e.g., Alexandris, 2009; Driver, 1983; Zhang et al., 2001) and conducting a test of content validity by a panel of experts, the Scale of Ski Motivation (SSM) measuring socio-motivations of ski participation was developed that had 33 items in a Likert 7-point scale and under seven factors, including nature, egotistic, family, social, exercise, risk, and escape factors. Measuring the ski resort pull factors was based on an adaptation of Nabitz’s (2014) customer preference scale on a ski resort’s offerings, which were of nine factors including condition of slopes, sceneries, equipment, waiting time, accessibility, recreational facilities, safety issues, cost, and training course feature. In addition to the push and pull factors, sociodemographic and skiing resort attendance frequency variables were also included in the survey form. Research respondents (N = 326) were attendees at a major ski resort located in Beijing. Conducting factor analyses and multiple repression analyses, two pull factors, nature and family, were found to be significantly (p \u3c .05) influencing the level of participation of leisure skiing. To a varying extent, five pull factors including accessibility, sceneries, condition of slopes, training course feature, and cost were also found to be significantly (p \u3c .05) influencing the level of attendance at the ski resort when sociodemographic backgrounds of participants were taken into consideration. Discussions are centered on the theoretical and managerial implications on procedures of pushing and pulling consumers to ski resorts at large and increasing winter-sport participating in China

Search space reduction for localization and tracking of an acoustic source

Experimental data from the SACLANTCEN 1993 Mediterranean Experiment are reviewed to assess the reduction of the search space for the localization and tracking of an acoustic source in a three-dimensional environment. Key to this goal is the availability of an initial estimate of source range and depth (called the 2D initial guess); an ambiguous estimate of source bearing can be obtained from the 2D initial guess through Environmental Signal Processing, and the ambiguity can be removed by searching for the source only in the range/bearing regions where bearing estimates are higher. This search provides a new estimate of source range and a single bearing, which together with the estimate for source depth constitute the center of the reduced search space for source localization and tracking. The suggested approach is tested on experimental data from the SACLANTCEN experiment considering different frequencies, as well as a stationary and a moving source.info:eu-repo/semantics/publishedVersio

An external potential dynamic study on the formation of interface in polydisperse polymer blends

The formation of interface from an initial sharp interface in polydisperse A/B blends is studied using the external potential dynamic method. The present model is a nonlocal coupling model as we take into account the correlation between segments in a single chain. The correlation is approximately expressed by Debye function and the diffusion dynamics are based on the Rouse chain model. The chain length distribution is described by the continuous Schulz distribution. Our numerical calculation indicates that the broadening of interface with respect to time obeys a power law at early times, and the power law indexes are the same for both monodisperse and polydisperse blend. The power law index is larger than that in the local coupling model. However there is not a unified scaling form of the broadening of the interface width if only the interfacial width at equilibrium is taken into account as the characteristic length of the system, because the correlation makes an extra characteristic length in the system, and the polydispersity is related to this length.Comment: 15 pages, 5 figure