期刊：
Ad Hoc Networks,2021年112:102394 ISSN：1570-8705
通讯作者：
Qin, Hua
作者机构：
[Li, Ni; Qin, Hua; Xiao, Xiang; Cao, Buwen; Zeng, Min; Chen, Weihong] Hunan City Univ, Coll Informat & Elect Engn, Yiyang, Hunan, Peoples R China.;[Peng, Yang] Univ Washington Bothell, Div Comp & Software Syst, Bothell, WA USA.
通讯机构：
[Qin, Hua] H;Hunan City Univ, Coll Informat & Elect Engn, Yiyang, Hunan, Peoples R China.
关键词：
Delay-tolerant;Data transportation;VANETs
摘要：
With the advancement of connected vehicles, high-bandwidth wireless technologies such as DSRC and WiFi are envisioned to be pervasively available on vehicles. Such empowered vehicles can form large-scale vehicular ad hoc networks (VANETs), which contain rich bandwidth and storage resources. Despite their critical importance for core safety-related VANET applications, these resources are underutilized in practice due to infrequent occurrence and limited size of safety-related messages. However, for a broad range of delay-tolerant applications, which run on edge networks and demand transmission of bulky data with hours or days of delay allowance, such underutilized bandwidth and storage resources in VANETs can be highly valuable. To efficiently utilize VANET resources for delay-tolerant bulky data transmission without compromising the performance of safety-related VANET applications, we propose a Delay-tolerant Data Transportation (DDT) scheme, which aims to use minimal VANET bandwidth to accomplish long-term data transportation under certain end-to-end delay requirements. Unlike traditional VANET data dissemination schemes which prefer data forwarding, DDT primarily relies on a more bandwidth-conserving data carrying method for data transportation. This unique feature makes our proposed system suitable to serve as a supplementary communication infrastructure for offloading and thus alleviating the data transmission workload on edge networks. Extensive simulations have been conducted using a customized simulator, and the results have demonstrated DDT's reliability and adaptability under various scenarios. Particularly, with moderate traffic density and delay requirements, the VANET bandwidth consumption of DDT is 27.3% lower than that of a naive scheme and 5.3% higher than that of a lower bound obtained from theoretical analysis, while the satisfaction ratio of delay requirements is as high as 0.965.
摘要：
The objective of this article is to explore the unsteady natural convection flows of Prabhakar-like non integer Maxwell fluid. Moreover, wall slip condition on temperature and Newtonian effects on heating are also studied. The generalized memory effects are illustrated with fractional time Prabhakar derivative. Dimensionless temperature and velocity are calculated analytically with the help of Laplace transform technique. A comparison among Prabhakar fractional natural convection flows and classical thermal transport which, illustrated by the Fourier's law. As a limiting case, we recovered the solution of ordinary Maxwell and Newtonian fluids from fractional Maxwell fluids with slip and no slip conditions. The results of fractional and important physical parameters are graphically covered. Accordingly, by comparing Maxwell fluids to viscous fluids, we found out that Maxwell fluids are move rapidly than viscous fluids. Moreover, the ordinary fluids moving fast than fractional fluids.
摘要：
A spin-dependent Seebeck diode is theoretically proposed, which consists of the junction with a semiconductor quantum dot sandwiched between the ferromagnetic and nonmagnetic leads. It is shown that both thermoelectric and thermal-spin currents driven by temperature bias exhibit asymmetric I-C(S)- Delta T characteristics. In the Coulomb blockade regime, anomalous suppression of the thermoelectric (thermal-spin) current is observed at the forward thermal bias direction (Delta T > 0). This asymmetry in the current profile suggests a diode-like behavior with respect to temperature bias. More interesting, the diode behavior of both thermoelectric and thermal-spin currents can be switched and even reversed by tuning the gate voltage, which may be facilely realized in experiments. This device scheme can be compatible with current technologies and has potential applications in spintronics or quantum processing. (C) 2021 Elsevier B.V. All rights reserved.
期刊：
Journal of Materials Science: Materials in Electronics,2021年32(24):28792-28806 ISSN：0957-4522
通讯作者：
Zhang, Hong
作者机构：
[Li, Zhicheng; Gao, Caiyun; Peng, Dicheng; Zhang, Hong; Zhang, Shuyan; Li, Bicai] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.;[Li, Bicai] Hunan City Univ, Sch Mat & Chem Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Zhang, Hong] C;Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.
摘要：
The Zn1-xGaxO (x = 0-0.020) ceramics modified with V2O5 were prepared by solid-state reaction method. The phase composition, microstructure, electrical conductivity, temperature sensitivity, and thermal aging property were investigated. The main phase of prepared ceramics is a hexagonal wurtzite crystal structure with a space group of P6(3)mc (186). Ga2O3 phase was detected in ceramics when the content of Ga-ion x is higher than 0.010. V2O5 acts as sintering aids and electrical stabilizer and enhanced the ceramic sintering ability. The Ga/V-modified ZnO ceramics exhibit typical NTC characteristics and have high temperature sensitivity with material constant of B values ranging from 3659 to 4590 K. The electrical properties and aging characteristics were studied with alternating current impedance spectrum and X-ray photoelectron spectroscopy. The Ga/V-co-modified ZnO ceramics show high electrical stability with resistance change rate (Delta R/R-0) less than 1.85% after aged at 150 degrees C for 1000 h. The increase of resistance by aging mainly came from the grain boundary effect.
作者机构：
[Wang, Miao-Kun] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.;[Chu, Hong-Hu] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.;[Chu, Yu-Ming] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.
通讯机构：
[Yu-Ming Chu] C;College of Science, Hunan City University, Yiyang, China
关键词：
Gaussian hypergeometric function;Ramanujan's cubic transformation;Ramanujan's generalized modular equation;Generalized Grotzsch ring function
摘要：
We study several special functions in Ramanujan’s generalized modular equation with signature 3. Some sharp inequalities for these functions, including the estimates for the solution of Ramanujan’s generalized modular equation with signature 3 and triplication inequality for the generalized Grötzsch ring function with two parameters, are derived.
作者：
Xiong, P-Y;Khan, M. Ijaz;Gowda, R. J. Punith;Kumar, R. Naveen;Prasannakumara, B. C.;...
期刊：
Modern Physics Letters B,2021年35(20):2150342 ISSN：0217-9849
通讯作者：
Yu-Ming Chu
作者机构：
[Xiong, P-Y] Hunan City Univ, Sch Sci, Yiyang 413000, Peoples R China.;[Khan, M. Ijaz] Riphah Int Univ, Dept Math & Stat, I-14, Islamabad 44000, Pakistan.;[Prasannakumara, B. C.; Kumar, R. Naveen; Gowda, R. J. Punith] Davangere Univ, Davangere, Karnataka, India.;[Prasannakumara, B. C.; Kumar, R. Naveen; Gowda, R. J. Punith] 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.
通讯机构：
[Yu-Ming Chu] H;Hunan Provincial Key Laboratory of Mathematical Modeling, and Analysis in Engineering, Changsha University of Science and Technology, Changsha 410114, China
摘要：
This investigation is about hybrid nanofluid flowing over a sheet. We considered two-dimensional Darcy–Forchheimer flow of different hybrid nanofluids with the influence of uniform heat source sink and nonlinear thermal radiation. Different nanoparticles can be used to improve the thermal conductivity of a liquid. A study comparing the various hybrid nanofluids to nanofluid is considered. Here, we have selected manganese Zinc ferrite and Nickel Zinc ferrite as nanoparticles with kerosene oil and engine oil as carrier liquids. Suitable similarity transformations are used to construct the required ordinary differential equations. The influence of several non-dimensional parameters on velocity and thermal gradients is analyzed through graphs. Also, entropy generation is computed and analyzed through graph for different involved parameters. Here, we observed that MnZnFe2O4– NiZnFe2O4– C10H22– C8H18 had lower velocity when compared to other two solutions. The entropy generation and Bejan number are high in MnZnFe2O4– NiZnFe2O4– C8H18 when compared to MnZnFe2O4– NiZnFe2O4– C10H22– C8H18 and MnZnFe2O4– NiZnFe2O4– C10H22 and increase in heat generation parameter increases the rate of heat transfer.
摘要：
In this study, PM10 samples at four locations of Loudi, China were collected from January 2017 to March 2017 and December 2017 to February 2018 at first. Then, a new analytical strategy of second-order calibration based on the alternating trilinear decomposition (ATLD) coupled with gas chromatography-mass spectrometry (GC-MS) was firstly developed for quantitative analysis of seven polycyclic aromatic hydrocarbons (PAHs) in these samples. This strategy is more sensitive and efficient than traditional chromatography not only, but also it can resolve the problems of baseline drift and peaks overlapping in chromatographic analysis. Without the need for intricate pretreatment process and any derivation reactions, useful qualitative and quantitative information of seven PAHs was quickly extracted from the GC-MS-Sample data array by replacing chemical or physical separation with mathematical separation. In validation samples, the average recoveries of seven PAHs ranged from (96.7 +/- 4.8) % to (107.9 +/- 4.2) %, and the root-mean-square errors of prediction (RMSEPs) were within the range of 0.03-0.35 mu g mL(-1). The highest concentrations of individual PAHs in these samples were for phenanthrene (1.34 mu g mL(-1) in monitoring station), acenaphthylene (0.79 mu g mL(-1) in municipal government) and chrysene (0.53 mu g mL(-1) in monitoring station). Identified by component analysis, coal combustion and vehicle exhaust were the most possible sources of Loudi, China. These results demonstrated that the proposed method is characterised as a more precise, simple and promising analytical strategy to identify and quantify PAHs in actual aerosol.
作者机构：
[Sun, Bo] Hunan City Coll, Sch Arts, Yiyang 413000, Hunan, Peoples R China.
摘要：
Music classification is conducive to online music retrieval, but the current music classification model finds it difficult to accurately identify various types of music, which makes the classification effect of the current music classification model poor. In order to improve the accuracy of music classification, a music classification model based on multifeature fusion and machine learning algorithm is proposed. First, we obtain the music signal, and then extract various features from the classification of the music signal, and use machine learning algorithms to describe the type of music signal and the relationship between the features. The music classifier and deep belief network machine learning models in shallow logistic regression are established, respectively. Experiments were designed for these two models to verify the applicability of the model for music classification. By comparing the experimental results, it is found that the classification accuracy of the deep confidence network model is higher than that of the logistic regression model, but the number of iterations needed for its accuracy to converge is also higher than that of the logistic regression model. Compared with other current music classification models, this model reduces the time of constructing music classifier, speeds up the speed of music classification, and can identify various types of music with high precision. The accuracy of music classification is obviously improved, which verifies the superiority of this music classification model.
关键词：
Frequency division multiaccess;Load modeling;Heuristic algorithms;Computer architecture;Peer-to-peer computing;Switches;Decision making;Distribution system;distributed generators (DGs);intentional islanding;network reconfiguration;service restoration;fully decentralized multi-agent system (FDMAS)
摘要：
The ever-growing requirement for reliability and quality of power supply suggests to enable self-healing features of smart distribution network using intelligent communication and control. In this article, a concept of fully decentralized multi-agent system (FDMAS) automation is proposed to build a unified restoration service framework for distribution network with distribution generators (DGs), where an FDMAS interaction mechanism is designed for establishing a reduced model which can significantly reduce the computational dimensions of service restoration. Furthermore, an FDMAS-based strategy is proposed for service restoration by combining network reconfiguration with intentional islanding; especially a network reconfiguration algorithm based on network flow model is presented, which, along with parameter justification, can mitigate the variations of loads and intermittence of DGs. The simulation studies are carried out on the 84-bus and 22-bus distribution system, respectively, using MATLAB and java agent development framework (JADE) simulation system and dynamic model test platform. The test results show that the proposed strategy can maximize restoration of out-of-service loads with minimum switching times and has an excellent performance on service restoration time.
期刊：
Journal of Chromatography A,2020年1618:460905 ISSN：0021-9673
通讯作者：
Zhang, Xiao-Hua;Liu, Zhi
作者机构：
[Zhang, Xiao-Hua; Mu, Shu-Ting; Zhou, Qian; Liu, Pan-Hua; Zheng, Jing-Jing] Xuchang Univ, Food & Bioengn Coll, Key Lab Biomarker Based Rapid Detect Technol Food, Xuchang 461000, Peoples R China.;[Liu, Zhi] Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Inst Qual & Stand Agr Prod, Hangzhou 310021, Peoples R China.;[Qing, Xiang-Dong] Hunan City Univ, Coll Mat & Chem Engn, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang 413049, Peoples R China.
通讯机构：
[Zhang, Xiao-Hua] X;[Liu, Zhi] Z;Xuchang Univ, Food & Bioengn Coll, Key Lab Biomarker Based Rapid Detect Technol Food, Xuchang 461000, Peoples R China.;Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Inst Qual & Stand Agr Prod, Hangzhou 310021, Peoples R China.
关键词：
Analysis of tea polyphenols;HPLC-DAD;Second-order advantage;Second-order multivariate methods;Time drift calibration
摘要：
Retention time shifts in second-order calibration-assisted chromatographic analysis seriously impact the modeling and quantitative accuracies in complex systems. In this work, three second-order methods, i.e. alternating trilinear decomposition (ATLD) algorithm, multivariate curve resolution-alternating least squares (MCR-ALS), alternating trilinear decomposition-assisted multivariate curve resolution (ATLD-MCR), were compared their performance to process liquid chromatographic data in the presence of retention time shifts and overlapped peaks. Firstly, the validation samples contain five tea polyphenols at three concentrate levels within the calibration ranges, helped to understand, visualize and interpret these features of three second-order multivariate methods. Secondly, experimental data were studied concerning the determination of polyphenols in Chinese tea samples by HPLC-DAD. The results showed that all three second-order multivariate methods realized satisfactory quantification for five targeted analytes in Pu-Er ripe tea samples and Green tea samples even with the interference of slight retention time shifts, average recoveries were 91.23% -113.16% for ATLD, 89.96%-115.96% for ATLD-MCR, 90.64%-117.60% for MCR-ALS, respectively. However, ATLD was disappointing in the case of larger time shifts (approx. 4.00 s and 6.40 s) occurring for the quantitative analysis of Black tea and Clinacanthus nutans tea, the average recoveries were just 67.33-84.05%. Relatively, MCR-ALS and ATLD-MCR were more significantly excellent, satisfactory results still can be obtained, the average recoveries for MCR-ALS and ATLD-MCR were in the range of 86.04-117.60% and 89.96-115.96%, respectively. (C) 2020 Elsevier B.V. All rights reserved.
摘要：
An esterification and amination of benzylic C-H bonds was developed by using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) under metal- and iodide-free conditions. Both carboxylic acids and amines could be used as ideal coupling partners for the oxidative coupling reactions with various diarylmethanes. A close to equal amount of coupling reagents was enough to afford the product in good to high yields.
作者机构：
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang, China;[Tang, Yongjian] Sichuan Civil-Military Integration Institute, Mianyang, China;[Wu, Xuanguang; Huang, Zhen] School of National Defense Science and Technology, Southwest University of Science and Technology, Mianyang, China;[Yi, Yougen] College of Physics and Electronics, Central South University, Changsha, China;[Zhang, Guangfu] School of Communication and Electronic Engineering, Hunan City University, Yiyang, China
通讯机构：
[Zao Yi] J;[Guangfu Zhang] S;Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang, China<&wdkj&>Sichuan Civil-Military Integration Institute, Mianyang, China<&wdkj&>School of Communication and Electronic Engineering, Hunan City University, Yiyang, China
