摘要：
The low spatial resolution of hyperspectral images leads to the coexistence of multiple ground objects in a single pixel (called mixed pixels). A large number of mixed pixels in a hyperspectral image hinders the subsequent analysis and application of the image. In order to solve this problem, a novel sparse unmixing method, which considers highly similar patches in nonlocal regions of a hyperspectral image, is proposed in this article. This method exploits spectral correlation by using collaborative sparsity regularization and spatial information by employing total variation and weighted nonlocal low-rank tensor regularization. To effectively utilize the tensor decomposition, nonlocal similar patches are first grouped together. Then, these nonlocal patches are stacked to form a patch group tensor. Finally, weighted low-rank tensor regularization is enforced to constrain the patch group to obtain an estimated low-rank abundance image. Experiments on simulated and real hyperspectral datasets validated the superiority of the proposed method in better maintaining fine details and obtaining better unmixing results.
摘要：
This paper aims to deal with the asymptotic stability of high-order neutral cellular neural networks (HNCNNs) incorporating proportional delays and D operators. Employing Lyapunov method, inequality technique and concise mathematical analysis proof, sufficient criteria on the global exponential asymptotical stability of the proposed HNCNNs are obtained. The main results provide us some light for designing stable HNCNNs and complement some earlier publications. In addition, simulations show that the theoretical convergence is in excellent agreement with the numerically observed behavior. (C) 2019 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
摘要：
Transition metal compounds are attractive for their significant applications in supercapacitors and as non-noble metal catalysts for electrochemical water splitting. Herein, we develop Ni_3S_2 nanorods growing directly on Ni foam, which act as multifunctional additive-free Ni_3S_2@Ni electrode for supercapacitor and overall water splitting. Based on PVA-KOH gel electrolyte, the assembled all-solid-state Ni_3S_2@Ni//AC asymmetric supercapacitor delivers a high areal energy density of 0.52 mWh cm~(–2) at an areal power density of 9.02 mW cm~(–2), and exhibits an excellent cycling stability with a capacitance retention ratio of 89% after 10000 GCD cycles at a current density of 30 mA cm~(–2). For hydrogen evolution reaction and oxygen evolution reaction in 1 M KOH, Ni_3S_2@Ni electrode achieves a benchmark of 10 mA cm~(–2) at overpotentials of 82 mV and 310 mV, respectively. Furthermore, the assembled Ni_3S_2@Ni||Ni_3S_2@Ni electrolyzer for overall water splitting attains a current density of 10 mA cm~(–2) at 1.61 V. The in-situ synthesis of Ni_3S_2@Ni electrode enriches the applications of additive-free transition metal compounds in high-performance energy storage devices and efficient electrocatalysis.
期刊：
Applied Mathematics and Computation,2020年376:125157 ISSN：0096-3003
通讯作者：
Yang, Xinsong
作者机构：
[Zhou, Ya; Yang, Xinsong; Wan, Xiaoxiao] Chongqing Normal Univ, Sch Math Sci, Chongqing 401331, Peoples R China.;[Zhou, Ya; Yang, Xinsong; Wan, Xiaoxiao] Minist Educ, Key Lab Optimizat & Control, Chongqing 401331, Peoples R China.;[Huang, Chuangxia] Changsha Univ Sci & Technol, Coll Math & Comp Sci, Dept Math, Changsha 410076, Hunan, Peoples R China.
通讯机构：
[Yang, Xinsong] C;Chongqing Normal Univ, Sch Math Sci, Chongqing 401331, Peoples R China.
关键词：
Finite-time technique;Intermittent control;Synchronization of coupled networks;Stochastic perturbation
摘要：
This paper considers the finite-time synchronization of dynamic networks with nonlinear coupling strength and stochastic perturbations by using intermittent control. Since it is difficult to estimate the settling-time due to the uncertain intermittent intervals, a novel lemma is established. Then, two quantized intermittent controllers without chattering are designed, which can reduce the control cost and save channel resources. T-S fuzzy method is utilized to deal with the nonlinear coupling strength. By using Lyapunov direct method, sufficient conditions formulated by linear matrix inequalities (LMIs) are derived to ensure that the considered system can realize finite-time synchronization. Moreover, the control gains are designed. Two numerical simulations are given to show the merits of theoretical analysis. Keywords: Finite-time technique Intermittent control Synchronization of coupled networks Stochastic perturbation (C) 2020 Elsevier Inc. All rights reserved.
关键词：
Construction and demolition wastes;Construction technology;Recycled aggregates;Field testing;Life cycle assessment
摘要：
With the rapid advancement of urbanization in China, a huge amount of construction and demolition wastes (CDW) are generated. Recycling CDW into subgrade materials is a promising way to process these wastes, with significant environmental and economic benefits. But very little work has been done in this field. Therefore, based on a CDW subgrade construction case in Beijing, the physical and chemical properties of the CDW materials were analyzed. Then the construction procedures of the CDW subgrade were presented, and a series of tests (compaction degree test, settlement observation, Portable Falling Weight Deflectometer test) were carried out. At the same time, the effects of different loose paving thicknesses, cycles of strong vibration on the subgrade performances were assayed. Subsequently, grading analysis of the CDW particles, plate load test and Beckman beam deflection test were performed to evaluate the construction quality. According to the test results, the construction technologies of the CDW subgrade, such as the optimum loose paving thicknesses and cycles of strong vibration, were determined. And then, the post-construction settlement monitor and radar survey were conducted for subgrades filled with CDW and soil to further analyze the applicability of CDW. The results show that recycled CDW aggregates with proper grading and strict construction technologies perform well. The subgrade filled with recycled CDW has a smaller deformation than that of the soil subgrade. Finally, the life cycle assessments (LCA) of two treating schemes of CDW were conducted to analyze the environmental benifits: recycling utilization as subgrade materials and directly landfilling. If the subgrade is filled with the recycled CDW aggregates, CDW will be consumed in large quantities and the environmental impactions of eutrophication and ecotoxicity can be reduced obviously. (C) 2020 Elsevier Ltd. All rights reserved.
摘要：
Porous hierarchical activated carbons (HACs) exhibit fascinating physical properties and are promising for supercapacitor applications. Facile and universal methods are required to produce high performance HACs on a large scale to boost their practical applications. An economical and template free method has been used to prepare HACs from lignocellulosic agricultural wastes with different contents of cellulose. These amorphous HACs exhibit high conductivity, a large specific surface area, and promising potentials for high performance supercapacitors. This study suggests the feasibility for facile and scalable conversion of inexpensive and earth-abundant agricultural wastes into high value-added carbon materials for energy storage applications. (C) 2019 Elsevier B.V. All rights reserved.
摘要：
In general, a proportional function is obviously not antiperiodic, yet a very interesting fact in this paper shows that it is possible there is an antiperiodic solution for some proportional delayed dynamical systems. We deal with the issue of antiperiodic solutions for RNNs (recurrent neural networks) incorporating multiproportional delays. Employing Lyapunov method, inequality techniques and concise mathematical analysis proof, sufficient criteria on the existence of antiperiodic solutions including its uniqueness and exponential stability are built up. The obtained results provide us some lights for designing a stable RNNs and complement some earlier publications. In addition, simulations show that the theoretical antiperiodic dynamics are in excellent agreement with the numerically observed behavior.
期刊：
JOURNAL OF INEQUALITIES AND APPLICATIONS,2020年2020(1):1-18 ISSN：1029-242X
通讯作者：
Qian, Chaofan
作者机构：
[Qian, Chaofan] Changsha Univ Sci & Technol, Sch Math & Stat, Changsha, Peoples R China.;[Qian, Chaofan] Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha, Peoples R China.;[Hu, Yuhui] Jiangxi Normal Univ, Coll Math & Informat Sci, Nanchang, Jiangxi, Peoples R China.
通讯机构：
[Qian, Chaofan] C;[Qian, Chaofan] H;Changsha Univ Sci & Technol, Sch Math & Stat, Changsha, Peoples R China.;Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha, Peoples R China.
关键词：
Nicholson’s blowflies system;Asymptotically almost periodic solution;Nonlinear density-dependent mortality;Global attractivity
摘要：
In this paper, we consider nonlinear density-dependent mortality Nicholson’s blowflies system involving patch structures and asymptotically almost periodic environments. By developing an approach based on differential inequality techniques coupled with the Lyapunov function method, some criteria are demonstrated to guarantee the global attractivity of the addressed systems. Finally, we give a numerical example to illustrate the effectiveness and feasibility of the obtain results.
摘要：
This paper investigates an autonomous Nicholson's blowflies equation incorporating two different delays. By using differential inequality techniques and dynamical system approaches, we establish two novel criteria to check the global exponential stability and asymptotical stability on the zero equilibrium point of the addressed equation, respectively. Our research partially answers an open question raised by Berezansky and Braverman (2017). A numerical example with simulations shows that the main theoretical results are correct. (C) 2019 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
