摘要：
To improve the issue of low-frequency and high-frequency components from feature maps being treated equally in existing image super-resolution reconstruction methods, the paper proposed an image super-resolution reconstruction method using attention mechanism with feature map to facilitate reconstruction from original low-resolution images to multi-scale super-resolution images. The proposed model consists of a feature extraction block, an information extraction block, and a reconstruction module. Firstly, the extraction block is used to extract useful features from low-resolution images, with multiple information extraction blocks being combined with the feature map attention mechanism and passed between feature channels. Secondly, the interdependence is used to adaptively adjust the channel characteristics to restore more details. Finally, the reconstruction module reforms different scales high-resolution images. The experimental results can demonstrate that the proposed method can effectively improve not only the visual effect of images but also the results on the Set5, Set14, Urban100, and Manga109. The results can demonstrate the proposed method has structurally similarity to the image reconstruction methods. Furthermore, the evaluating indicator of Peak Signal to Noise Ratio (PSNR) and Structural Similarity Index (SSIM) has been improved to a certain degree, while the effectiveness of using feature map attention mechanism in image super-resolution reconstruction applications is useful and effective.
作者机构：
[Lv, Qi-Yan; Sun, Kai; Yu, Bing] Zhengzhou Univ, Coll Chem, Green Catalysis Ctr, Zhengzhou 450001, Peoples R China.;[Lv, Qi-Yan; He, Wei-Min] Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Peoples R China.;[Lin, Ying-Wu] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[He, Wei-Min] Hunan Univ Sci & Engn, Dept Chem, Yongzhou 425100, Peoples R China.
通讯机构：
[Yu, Bing] Z;[He, Wei-Min] C;[He, Wei-Min] H;Zhengzhou Univ, Coll Chem, Green Catalysis Ctr, Zhengzhou 450001, Peoples R China.;Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Peoples R China.
摘要：
The cyano group is a valuable and readily available functional group for the preparation of various functional groups, such as amines, carboxylic acids, and ketones. In recent decades, the radical cascade reaction has emerged as a versatile tool to prepare a large variety of functional molecules. The application of the cyano group as a radical acceptor in cascade reactions provides diverse opportunities for the convenient construction of various important heterocycles and carbocycles. Such synthetic strategies will open new ways for the rapid buildup of molecular complexity. The focus of this review is the summary of the dynamic field of radical cascade processes using the cyano group as a radical acceptor, which has not been well documented so far.
关键词：
Coupled Maccari’s system;Soliton solutions with complex structure;Sine-cosine and sinh-cosh techniques
摘要：
The aim of this study is to find new exact solutions to the coupled Maccaris system by extended rational sine-cosine and rational sinh-cosh methods. By means of these methods, we found some fresh solitons of the above mentioned equation. The solutions are expressed in the form of new periodic,dark,bright and bright periodic solitons solutions. These methods are efficient, powerful, and they can be used as an alternative to establish new soliton of different types of differential PDEs applied in mathematical physics. Also, in order to visualize the underlying dynamics of the obtained soliton solutions, 2D and 3D plots are drawn. Computational results indicate not only the efficiency and strength of the methods but also further possible applicability potential of these techniques to some other significant nonlinear PDEs.
期刊：
International Review of Financial Analysis,2021年74:101676 ISSN：1057-5219
通讯作者：
Fenghua Wen
作者机构：
[Dai, Zhifeng; Kang, Jie] College of Mathematics and Statistics, Changsha University of Science and Technology, Hunan 410114, China;[Wen, Fenghua] College of business, Central South University, Hunan 410083, China
通讯机构：
[Fenghua Wen] C;College of business, Central South University, Hunan 410083, China
摘要：
This paper proposes a new and efficient model selection strategy to obtain significant stock returns predictability from a risk measurement perspective. The risk interval is defined as the distance between the current actual return and the returns' historical average. The model selection strategy involves switching stock return forecasting models according to different risk intervals from the mean reversion and extreme value theory. This new strategy generates encouraging results in the empirical analysis. A mean-variance investor can realize sizeable economic gains by allocating assets through this new approach relative to competing forecasting models. Furthermore, the strategy performs robustly under alternative settings from both statistical and economic perspectives.
通讯机构：
[Songtao Lv] P;Professor, National Engineering Laboratory of Highway Maintenance Technology, Changsha Univ. of Science and Technology, Hunan 410004, PR China
摘要：
In this paper, styrene butadiene rubber (SBR) was utilized to improve the low-temperature performance of Buton-rock asphalt (BRA)-modified asphalt. Firstly, the optimum content of SBR modifier agent was determined by basic mechanical property tests, including penetration, ductility, and soft point tests. The comprehensive road performance, including high- and low-temperature performance, moisture resistance, and antifatigue performance at a low-temperature condition, of SBR-BRA-modified asphalt mixtures was evaluated by comparison with a base asphalt mixture, SBR-modified asphalt mixture, BRA-modified asphalt, and styrene-butadiene-styrene (SBS)-modified asphalt mixture. The fatigue test under the experimental temperature of -10 degrees C and loading frequencies of 0.01, 0.1, 1, 5, and 10 Hz were designed to evaluate the antifatigue capacity of SBR-BRA-modified asphalt mixture under the low-temperature region. The S-N fatigue equation with the stress ratio related to loading rates was proposed to characterize the fatigue property of asphalt mixtures and reveal the different effects of loading frequency and materials on the fatigue property of asphalt mixtures. The tests results demonstrated that the SBR-BRA-modified asphalt has an equal road performance to SBS-modified asphalt. Analyzed by the S-N fatigue equation with the stress ratio related to loading rates, the fatigue test results under different loading frequencies could be fitted to a fatigue curve, and the fatigue curves of different asphalt mixtures exist at an angle and intersect at point (1, 1). (C) 2020 American Society of Civil Engineers.
期刊：
Journal of Molecular Liquids,2021年326:115268 ISSN：0167-7322
通讯作者：
Yu-Ming Chu
作者机构：
[Li, Junhua] Guangxi Hualan Yantugongcheng Ltd Co Grp Co Ltd, 38 Wangzhou Rd Beierli, Nanning 530001, Guangxi, Peoples R China.;[Alawee, Wissam H.] Univ Technol Baghdad, Control & Syst Engn Dept, Baghdad, Iraq.;[Alawee, Wissam H.] Univ Technol Baghdad, Training & Workshops Ctr, Baghdad, Iraq.;[Rawa, Muhyaddin J. H.] King Abdulaziz Univ, Fac Engn, Ctr Res Excellence Renewable Energy & Power 5Yste, Jeddah 21589, Saudi Arabia.;[Rawa, Muhyaddin J. H.] King Abdulaziz Univ, Fac Engn, Dept Elect & Comp Engn, Jeddah 21589, Saudi Arabia.
通讯机构：
[Yu-Ming Chu] D;Department of Mathematics, Huzhou University, Huzhou 313000, PR China<&wdkj&>Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science & Technology, Changsha 410114, PR China
摘要：
In current context, turbulent flow with install of helical tape has been analyzed in a system in which nanofluid was utilized in shell side. Both hydrothermal and exergy analysis are presented. Hot gas and H2O-CuO nanofluid are considered as working fluids. FVM is utilized to explore the roles of Re, number of revolution (N) on hydrothermal treatment. Suitable correlations for entropy components are extracted according to obtained data. Radial velocity can be augmented with enhance of revolution and inlet velocity of nanofluid. So, friction augments and higher values of pressure drop can be achieved. Augment of revolution leads to augmentation of pressure loss about 95.25% and 81.42% depend on the values of Re. When revolution has highest value, pressure drop faces 389.4% augmentation with rise of Re. With assuming largest amounts of other variables, growth of Re makes outlet temperature to reduce about 8.4% while rise of N results in 0.73% augmentation in T-out. Assuming N=7, augment of Re leads to decline X-d by 64.29%. At Re*=5, growth of N up to 7 makes X-d to reduce about 62.43%. (C) 2020 Elsevier B.V. All rights reserved.
通讯机构：
[He, Qiulai] H;Hunan Univ, Coll Civil Engn, Dept Water Engn & Sci, Minist Educ,Key Lab Bldg Safety & Energy Efficien, Changsha 410082, Hunan, Peoples R China.
关键词：
Extracellular polymeric substances;Illumina MiSeq sequencing;Low strength and salinity wastewater;Phenol;Redundancy analysis;Simultaneous nitrogen and phosphorus removal
摘要：
The effects of phenol on aerobic granular sludge including extracellular polymeric substances (EPS) and microbial community were investigated for low strength and salinity wastewater treatment. Elevated phenol over 20 mg/L stimulated biological phosphorus removal mainly via co-metabolism with nearly complete phenol degradation, whereas resulted in significant accumulation of nitrate around 4 mg/L. Aerobic granules kept structural stability via enhancing production of extracellular polymeric substances (EPS), especially folds of polysaccharides (PS) and varying functional groups identified through EEM, FTIR and XPS spectral characterizations at increasing phenol loads. Illumina MiSeq sequencing results indicated that elevated phenol decreased the bacterial diversity and richness, and caused remarkable variations in structural and compositions of microbial population. Multiple halophilic bacteria including Stappia, Luteococcus, and Formosa laid the biological basis for stability of aerobic granules and efficient biological nutrients and phenol removal. Redundancy analysis (RDA) suggested the key role of phenol in shaping the relative abundances and predominant genera. This study proved that aerobic granular sludge was feasible for low-saline and phenol-laden low-strength wastewater treatment. (C) 2020 Elsevier B.V. All rights reserved.
摘要：
In order to solve the issue mismatching and structure disconnecting in exemplar-based image inpainting, an image completion algorithm based on improved total variation minimization method had been proposed in the paper, refer as ETVM. The structure of image had been extracted using improved total variation minimization method, and the known information of image is sufficiently used by existing methods. The robust filling mechanism can be achieved according to the direction of image structure and it has less noise than original image. The priority term had been redefined to eliminate the product effect and ensure data term had always effective. The priority of repairing patch and the best matching patch are determined by the similarity of the known information and the consistency of the unknown information in the repairing patch. The comparisons with cognitive computing image algorithms had been shown that the proposed method can ensure better selection of candidate image pixel to fill with, and it is achieved better global coherence of image completion than others. The inpainting results of noisy images show that the proposed method has good robustness and can also get good inpainting results for noisy images.
摘要：
In this article, we present several results on Finite-Time Stability (FTS) of impulsive differential inclusion. In order to investigate the FTS problem, a new concept of Finite-Time Stable Function Pair (FTSFP) is proposed. By virtue of average impulsive interval and FTSFP, two unified criteria on FTS of impulsive differential inclusion are obtained, which are effective for both the destabilizing impulses and the stabilizing impulses. In addition, the settling-time depends not only on the initial value, but also on the information of impulsive sequence. As an extension, a delay-independent FTS result of impulsive delayed differential inclusion is presented. Finally, the obtained results are applied to study the FTS of discontinuous impulsive neural networks.
关键词：
dispersions;fourth Grade Fluid;Couette and Generalized;Couette flows;inclined channel;multiphase flow
摘要：
This paper offers a comparative investigation of the multiphase flow of Newtonian and non-Newtonian dispersions passing through an inclined channel. Couette and Generalized Couette flow models are taken into account. A fourth-grade fluid is taken as non-Newtonian fluid, as well as base fluid. The stress tensor of fourth-grade fluid is used to formulate the problem. The relative motion between fluid and the upper plate is considered, while the relative motion between fluid and lower plate is mistreated. Crystal and Hafnium nano-sized particles are utilized to prepare dispersions. An external magnetic field is applied to the multiphase flows of dispersions in the channel and at the same time, the impact of gravitational force is also examined which has great mastery on flows. The governing equations for two-phase flows problem are determined by using Naiver-Stokes equations of continuity and momentum. Partial differential equations are reduced into ordinary differential equations by using appropriate transformations. The perturbation method is used to find out analytical solutions to these ordinary differential equations. Exact and approximation solutions are obtained by using MATHEMATICA Software. The impacts of salient parameters on each type of flow for velocity profile are discussed graphically. Furthermore, the comparison of velocity profiles of multiphase flows of dispersions is also presented in tabular forms. The variation in the magnitude of the fourth-grade non-Newtonian dimensionless parameter has great importance in non-Newtonian dispersions. The outcomes dispose of that the two-phase flows of Newtonian fluids suspended with crystal and hafnium particles are better one than the bi-phase flows of fourth-grade dispersions. Moreover, the Newtonian fluids suspended with hafnium particles are more consequential than the Newtonian fluids suspended with crystal particles. Similarly, the same behavior is observed in fourth-grade non-Newtonian dispersions. Then it is concluded that hafnium particles are a better option than crystal particles. These amalgams are very useful in every field of life, especially medicine as nanofluid drug delivery. In addition to this, no comparative analysis between Newtonian and fourth-grade non-Newtonian bi-phase flows has so far been reported in the existing literature.
通讯机构：
[Chen, Yuantao] C;Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha 410114, Hunan, Peoples R China.;Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Proc Big Data Tran, Changsha 410114, Hunan, Peoples R China.
关键词：
Generative adversarial network;Image inpainting;Residual network;Contextual loss function
摘要：
Existing image inpainting algorithms based on neural network models are affected by structural distortions and blurred textures on visible connectivity. As a result, overfitting and overlearning phenomena can easily emerge during the image inpainting procedure. Image inpainting refers to the repairing of missing parts of an image, given an image that is broken or incomplete. After the repairing operation is complete, there are obvious signs of repair in damaged areas, semantic discontinuities, and unclearness. This paper proposes an improved image inpainting method based on a new encoder combined with a context loss function. In order to obtain clear repaired images and ensure that the semantic features of images are fully learned, a generative network based on the fusion model of squeeze-and-excitation networks deep residual learning has been proposed to improve the application of network features in order to obtain clear images and reduce network parameters. At the same time, a discriminative network based on the squeeze-and-excitation residual Network has been proposed to strengthen the capability of the discriminative network. In order to make the generated image more realistic, so that the restored image will be more similar to the original image, a joint context-awareness loss training method (contextual perception loss network) has also been proposed to generate the similarity of the local features of the network constraint, with the result that the repaired image is closer to the original picture and more realistic. The experimental results can demonstrate that the proposed algorithm demonstrates better adaptive capability than the comparison algorithms on a number of image categories. In addition, the processing results of the image inpainting procedure were also superior to those of five state-of-the-art algorithms.
作者：
Chu, Yu-Ming;Almusawi, Mohammed Baqer;Hajizadeh, Mohammed Reza;Yao, Shao-Wen;Quang-Vu Bach
期刊：
International Journal of Modern Physics C,2021年32(05):2150061 ISSN：0129-1831
通讯作者：
Mohammed Reza Hajizadeh
作者机构：
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.;[Chu, Yu-Ming] Changsha Univ Sci & Technol, Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha 410114, Peoples R China.;[Almusawi, Mohammed Baqer] Univ Tun Hussein Onn Malaysia, KFA, Batu Pahat 86400, Johor State, Malaysia.;[Hajizadeh, Mohammed Reza] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam.;[Hajizadeh, Mohammed Reza] Duy Tan Univ, Fac Environm & Chem Engn, Da Nang 550000, Vietnam.
通讯机构：
[Mohammed Reza Hajizadeh] I;Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam<&wdkj&>The Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang 550000, Vietnam
关键词：
MHD;permeability;hybrid nanopowder;entropy
摘要：
In this paper, porous chamber with considering nanomaterial as operating fluid has been scrutinized. The transportation of nanopowder was controlled by magnetic force and insert of porous media boosts the cooling rate. Such zone needs special model to involve the impact of porous media and in this paper, non-Darcy technique was utilized. Low fraction of hybrid nanomaterial leads to good accuracy of homogeneous model and empirical correlations have been employed to forecast the features of operating fluid. Entropy generation was studied to find the influence of each term on irreversibility of unit. Also, two significant functions were calculated, namely, Be and Nu. Influences of Ra, Da and Ha on contours plots were reported in outputs. As Ra augments, the convection becomes stronger and augmentation of Ψ proves this fact. Also, temperature of elliptic surface declines about 48% with intensifying Ra. Temperature of elliptic surface augments about 34.6% with augment of Ha while it declines about 25.7% considering greater permeability. Nu augments about 238%, 11.49% with rise of Ra, Da but it declines about 28.3% with rise of Ha. Be intensifies with rise of Ha about 7.76% while it reduces about 75.2% with augmentation of Ra.
摘要：
Present communication explores the multi-phase flow of non-Newtonian fluid with heat transfer through a horizontal channel. Jeffrey fluid is considered as the base liquid which suspends metallic particles of Hafnium (Hf). Heating effects have been applied on the upper wall. The magnetic field, along with radiative heat flux, has also been taken into account. Three different particulate flows, namely; (i) pressure-driven multi-phase flow, (ii) moving wall-driven multi-phase flow and, (iii) pressure and moving wall driven multi-phase, are derived . A closed-form solution for each bi-phase flow is achieved and compared. The impacts of most significant emerging parameters, on velocity and temperature profile, are observed graphically. It is inferred that more thermal energy adds to the system friction force and viscous dissipation, whereas, heat transfer rate increases due to radiation. The momentum of multi-phase flow enhances due to shear thinning effects caused by Jeffrey fluid parameter.
期刊：
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES S,2021年14(4):1259-1272 ISSN：1937-1632
通讯作者：
Huang, Chuangxia;Cao, Jinde
作者机构：
[Yang, Hedi; Huang, Chuangxia] Changsha Univ Sci & Technol, Sch Math & Stat, Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha 410114, Hunan, Peoples R China.;[Cao, Jinde] Southeast Univ, Sch Math, Nanjing 211189, Peoples R China.
通讯机构：
[Huang, Chuangxia] C;[Cao, Jinde] S;Changsha Univ Sci & Technol, Sch Math & Stat, Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha 410114, Hunan, Peoples R China.;Southeast Univ, Sch Math, Nanjing 211189, Peoples R China.
关键词：
D operator;Neural networks;Proportional delay;Weighted pseudo almost periodic solution
摘要：
Taking into account the effects of multi-proportional delays and D operator, this paper investigates the stability issue of a general class of neutral-type SICNNs (shunting inhibitory cellular neural networks). With the help of fixed point theorem and some novel differential inequality techniques, we derive a new sufficient conditions to ensure the existence, uniqueness and exponential stability of weighted pseudo almost periodic solutions (WPAPS) of the considered model. The obtained main results are totally new and generalize some published results. At the end of this work, we also give some numerical simulations to support the proposed approach and demonstrate the correctness of the main conclusions.
