关键词：
Key Words and Phrases;fractional evolution equations;admissible "state control" pair;density;co-density
摘要：
In this paper, we discuss a class of Caputo fractional evolution equations on Banach space with feedback control constraint whose value is non-convex closed in the control space. First, we prove the existence of solutions for the system with feedback control whose values are the extreme points of the convexified constraint that belongs to the original one. Secondly, we study the topological properties of the sets of admissible “state-control” pair for the original system with various feedback control constraints and the relations between them. Moreover, we obtain necessary and sufficient conditions for the solution set of original systems to be closed. In the end, an example is given to illustrate the applications of our main results.
摘要：
Electrically conductive cementitious composites (ECCC) possesses numerous virtues including low resistivity and high strain sensitivity, which can be applied as a conductive sensor to monitor structural health. This study produced ECCC with three conductive ingredients, consisting of graphite powder (GP), ground granulated blast-furnace slag (GGBS), and steel slag (SS). The uniaxial compressive strength (UCS), flexural strength (FS), and electrical conductivity were investigated, which showed that the GP enhanced the conductivity more remarkably than the other conductive materials. However, it simultaneously reduced the UCS and FS of ECCC. Also, ECCC samples containing SS had higher FS and conductivity than that containing GGBS. To overcome the challenge of excessive variables, this study introduced an artificial-intelligence (AI) based multi-objective optimisation (MOO) model with 252 samples for the FS test and 336 samples for the resistivity experiment. The support vector regression (SVR) was trained with hyperparameters tuned by the beetle antennae search (BAS). The high correlation coefficients (0.981) were achieved on both test sets. The BAS-SVR model acted as the objective function to develop the multi-objective beetle antennae search algorithm (MOBAS-SVR). The Pareto front of a tri-objective mixture optimisation design for ECCC (cost, FS, and resistivity) was successfully obtained as a design reference. Furthermore, sensitivity research was implemented to comprehend the importance of the variables for the FS and electrical resistivity.
期刊：
BMC Ecology and Evolution,2021年21(1):1-17 ISSN：2730-7182
通讯作者：
Xu, Zhenggang
作者机构：
[Zhao, Yunlin; Xu, Zhenggang; Peng, Jiao] Cent South Univ Forestry & Technol, Hunan Res Ctr Engn Technol Utilizat Environm & Re, Changsha 410004, Hunan, Peoples R China.;[Zhong, Xiaofen; Zhao, Yunlin; Liu, Shiquan; Xu, Zhenggang; Dong, Meng; Hu, Zhiyuan; Peng, Jiao] Hunan City Univ, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang 413000, Hunan, Peoples R China.;[Xu, Zhenggang] Northwest A&F Univ, Coll Forestry, Natl Forestry & Grassland Adm Management, Key Lab, Yangling 712100, Shaanxi, Peoples R China.
通讯机构：
[Xu, Zhenggang] H;Hunan Research Center of Engineering Technology for Utilization of Environmental and Resources Plant, Central South University of Forestry and Technology, Changsha, 410004, Hunan, People's Republic of China.;Hunan Provincial Key Lab of Dark Tea and Jin-Hua, Hunan City University, Yiyang, 413000, Hunan, People's Republic of China.;Key Laboratory of National Forestry and Grassland Administration on Management of Western Forest Bio-Disaster, College of Forestry, Northwest A & F University, Yangling, 712100, Shaanxi, People's Republic of China.
摘要：
Cultivated tea is one of the most important economic and ecological trees distributed worldwide. Cultivated tea suffer from long-term targeted selection of traits and overexploitation of habitats by human beings, which may have changed its genetic structure. The chloroplast is an organelle with a conserved cyclic genomic structure, and it can help us better understand the evolutionary relationship of Camellia plants. We conducted comparative and evolutionary analyses on cultivated tea and wild tea, and we detected the evolutionary characteristics of cultivated tea. The chloroplast genome sizes of cultivated tea were slightly different, ranging from 157,025 to 157,100bp. In addition, the cultivated species were more conserved than the wild species, in terms of the genome length, gene number, gene arrangement and GC content. However, comparing Camellia sinensis var. sinensis and Camellia sinensis var. assamica with their cultivars, the IR length variation was approximately 20bp and 30bp, respectively. The nucleotide diversity of 14 sequences in cultivated tea was higher than that in wild tea. Detailed analysis on the genomic variation and evolution of Camellia sinensis var. sinensis cultivars revealed 67 single nucleotide polymorphisms (SNPs), 46 insertions/deletions (indels), and 16 protein coding genes with nucleotide substitutions, while Camellia sinensis var. assamica cultivars revealed 4 indels. In cultivated tea, the most variable gene was ycf1. The largest number of nucleotide substitutions, five amino acids exhibited site-specific selection, and a 9bp sequence insertion were found in the Camellia sinensis var. sinensis cultivars. In addition, phylogenetic relationship in the ycf1 tree suggested that the ycf1 gene has diverged in cultivated tea. Because C. sinensis var. sinensis and its cultivated species were not tightly clustered. The cultivated species were more conserved than the wild species in terms of architecture and linear sequence order. The variation of the chloroplast genome in cultivated tea was mainly manifested in the nucleotide polymorphisms and sequence insertions. These results provided evidence regarding the influence of human activities on tea.
摘要：
Indoor thermal environment significantly affects human health and comfort. Although several studies have investigated this aspect in numerous buildings, a gap exists with regard to the hospital waiting areas and the thermal comfort of pregnant women. Therefore, this study assessed the ambient conditions in the waiting areas of obstetric departments in four Guangzhou hospitals during summer and winter and conducted a questionnaire survey on pregnant women and males & non-pregnant female patients in the waiting areas to analyze the differences in their thermal sensation. A total of 2594 questionnaire responses were collected during the survey period, including 1477 and 1117 responses during summer and winter, respectively. Further, the predicted mean vote (PMV) model was applied to evaluate the thermal comfort and differences in the thermal sensation between pregnant women and escorts. The results indicated that the PMV model could not accurately predict the thermal comfort of the subjects and overestimated their thermal sensation. Additionally, the acceptable operative temperature ranges in the obstetric waiting areas were 23.8-28.6 degrees C and 18.5-23.5 degrees C, and acceptable standard effective temperature ranges were 21.0-27.9 degrees C and 19.0-25.8 degrees C during summer and winter, respectively. Further, the neutral temperature of pregnant women was lower than that of the males & non-pregnant female patients. The results of this study can guide the indoor thermal environments in the hospitals for the improved comfort of pregnant women, which in turn, will benefit their health as well as that of their babies.
摘要：
In the environment of cloud computing, the data produced by massive users form a data stream and need to be protected by encryption for maintaining confidentiality. Traditional serial encryption algorithms are poor in performance and consume more energy without considering the property of streams. Therefore, we propose a velocity-aware parallel encryption algorithm with low energy consumption (LECPAES) for streams in cloud computing. The algorithm parallelizes Advanced Encryption Standard (AES) based on heterogeneous many-core architecture, adopts a sliding window to stabilize burst flows, senses the velocity of streams using the thresholds of the window computed by frequency ratios, and dynamically scales the frequency of Graphics Processing Units (GPUs) to lower down energy consumption. The experiments for streams at different velocities and the comparisons with other related algorithms show that the algorithm can reduce energy consumption, but only slightly increases retransmission rate and slightly decreases throughput. Therefore, LECPAES is an excellent algorithm for fast and energy-saving stream encryption.
期刊：
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY,2021年29(05):2140018 ISSN：0218-348X
通讯作者：
YU-MING CHU
作者机构：
[LI, Yong-min] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.;[Rashid, Saima] Govt Coll Univ, Dept Math, Faisalabad 38000, Pakistan.;[Hammouch, Zakia] Thu Dau Mot Univ, Div Appl Math, Binh Duong Province, Vietnam.;[Hammouch, Zakia] China Med Univ, Dept Med Res, China Med Univ Hosp, Taichung 40402, Taiwan.;[Hammouch, Zakia] Moulay Ismail Univ, Ecole Normale Super, Meknes 5000, Morocco.
通讯机构：
[YU-MING CHU] C;College of Science, Hunan City University, Yiyang 413000, P. R. China
关键词：
Fractal Sets;Generalized Convex Function;Generalized Harmonically Convex Function;Generalized p -Convex Functions;Newton's Type Inequality
摘要：
This paper aims to investigate the notion of p-convex functions on fractal sets ℝα̂(0<α̂≤1). Based on these novel ideas, we derived an auxiliary result depend on a three-step quadratic kernel by employing generalized p-convexity. Take into account the local fractal identity, we established novel Newton’s type variants for the local differentiable functions. Several special cases are apprehended in the light of generalized convex functions and generalized harmonically convex functions. This novel strategy captures several existing results in the relative literature. Application is obtained in cumulative distribution function and generalized special weighted means to confirm the relevance and computational effectiveness of the considered method. Finally, we supposed that the consequences of this paper can stimulate those who are interested in fractal analysis.
作者：
Li, Yun-Xiang;Khan, Sami Ullah;Shah, Faqir;Waqas, Hassan;Khan, M. Ijaz;...
期刊：
International Journal of Modern Physics B,2021年35(19):2150199 ISSN：0217-9792
通讯作者：
M. Ijaz Khan
作者机构：
[Li, Yun-Xiang] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Khan, Sami Ullah] COMSATS Univ Islamabad, Dept Math, Sahiwal 57000, Pakistan.;[Shah, Faqir] Karakoram Int Univ, Dept Math, Gilgit 15100, Pakistan.;[Waqas, Hassan] Govt Coll Univ Faisalabad, Dept Math, 31200 Layyah Campus, Faisalabad, Pakistan.;[Khan, M. Ijaz] Riphah Int Univ I 14, Dept Math & Stat, Islamabad 44000, Pakistan.
通讯机构：
[M. Ijaz Khan] D;Department of Mathematics and Statistics, Riphah International University I-14, Islamabad 44000, Pakistan<&wdkj&>Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P. O. Box 80257, Jeddah 21589, Saudi Arabia
摘要：
In nanotechnology, the nanofluids are decomposition of base materials and nanoparticles where the nanoparticles are immersed in base liquid. The utilization of such nanoparticles into base liquids can significantly enhance the thermal features of resulting materials which involve applications in various industrial and technological processes. While studying the rheological features of non-Newtonian fluids, the constant viscosity assumptions are followed in many investigations. However, by considering the viscosity as a temperature-dependent is quite useful to improve the heating processes along with nanoparticles. Keeping such motivations in mind, this investigation reports the temperature-dependent viscosity and variable heat-dependent conductivity in bioconvection flow of couple stress nanoparticles encountered by a moving surface. The famous Reynolds exponential viscosity model is used to deploy the relations for temperature-dependent viscosity. Moreover, the activation energy and higher order slip (Wu’s slip) are also elaborated to make this investigation more novel and unique. The emerging flow equations for governing flow problem are formulated which are altered into non-dimensional forms. The numerical simulations with applications of Runge–Kutta fourth–order algorithm are focused to obtain the desired solution. Before analyzing the significant physical features of various parameters, the confirmation of solution is done by comparing the results with already reported investigations as limiting cases. The results are graphically elaborated with relevant physical consequences. Various plots for velocity, temperature, concentration, wall shear stress, local Nusselt number, local Sherwood number and motile density numbers are prepared.
摘要：
Aiming at the problem that the current algorithm of lighting effect cannot achieve a good effect in 3D interior design, this paper proposes an algorithm based on multi algorithm fusion to realize lighting effect in 3D interior design. The algorithm first optimizes the intersection of patch, sphere and rectangle based on ray tracing algorithm, and then optimizes the optimization algorithm and the algorithm of lighting shadow at the same time, it is applied to the realization of lighting effect of 3D interior design. The simulation results show that the algorithm based on multi algorithm fusion is more ideal for the realization of 3D interior design lighting effect than the existing algorithm.
作者：
Zhou, Shuang-Shuang;Abbasi, Aamar;Farooq, Waseh;Khan, M. Ijaz;Khan, Sami Ullah
期刊：
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS,2021年230(18-20):3731-3741 ISSN：1951-6355
通讯作者：
M. Ijaz Khan
作者机构：
[Zhou, Shuang-Shuang] Hunan City Univ, Sch Sci, Yiyang 413000, Peoples R China.;[Farooq, Waseh; Abbasi, Aamar] Univ Azad Jammu & Kashmir, Dept Math, Muzaffarabad 13100, Pakistan.;[Khan, M. Ijaz] Riphah Int Univ, Dept Math, I-14, Islamabad 44000, Pakistan.;[Khan, Sami Ullah] COMSATS Univ Islamabad, Dept Math, Sahiwal 57000, Pakistan.
通讯机构：
[M. Ijaz Khan] D;Department of Mathematics, Riphah International University, I-14, Islamabad, Pakistan
关键词：
EPJ Special Topics;publication;topical issues;journal;EPJ
摘要：
The peristaltic transport of nano-fluid under the influence of a magnetic field through a bio-fluidic channel is investigated numerically in this article. The geometry of the channel is assumed to be inclined and Oldroyd 4-constant fluid is flowing through it with Joule heating effects. The non-linear partial differential equations that lead the flow system are simplified using the approximations of long wavelength with low Reynolds number. The reduced coupled nonlinear are approximated by means of shooting technique. The obtained results for stream function, velocity, wall shear stress, nanoparticles volume fraction and temperature profile are demonstrated graphically to evaluate the insight physical aspects of emerging parameters such as Hartman number, angle of inclination, phase angle, Brownian motion constant, non-uniform constant and the thermophoresis parameter. Trapping phenomena is also prepared to give pictorial view to the flow phenomena
摘要：
Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr (wt.%) alloy is prepared with metal mold casting and followed hot extruded at 400 degrees C with the extrusion ratio of 25:1. Microstructure and mechanical properties of the as-extruded alloy are investigated using optical microscope (OM), scanning electron microscope (SEM) with electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscope (TEM). The results show that the as-extruded alloy is fully dynamically recrystallized, which develops rare earth (RE) texture component. The as-extruded alloy shows an age-hardening response at 200 degrees C, in which there are numerous nano-scale plate strengthening phase beta' precipitated in the matrix. The as-extruded alloy in the peak-aged condition exhibits ultimate tensile strength, yield strength, and elongation of 332 MPa, 220 MPa and 22.7% at room temperature, respectively. The dominant strengthening mechanisms of the investigated alloy are fine-grain strengthening, solid solution strengthening and precipitate strengthening. (C) 2021 The Author(s). Published by Elsevier B.V.
摘要：
In this paper, a total of 70 experimental flexural tests of corroded post-tensioned prestressed concrete (PC) beams were gathered from the published literatures. Using the experimental data, a comprehensive databank of flexural capacity of the corroded PC beams was established. Meanwhile, four existing empirical models for calculating the residual flexural strength of the corroded PC beams were also gleaned and contrasted with each other based on the databank. It turns out that three of the four existing empirical models underestimate the flexural capacity. To deeply analyze the factors affecting the flexural capacity, numerous factors were discussed, e.g., the corrosion ratio, beam width, effective height of the beam section, concrete compressive strength, and the ratio of strength between the tensile reinforcement (including prestressed and non-prestressed reinforcement) and concrete. It is found that the corroded post-tensioned PC beams’ residual flexural capacity is affected most by the corrosion ratio. In the end, a better empirical model is proposed for computing the residual flexural capacity of corroded PC beams, which provides accurate and effective predictions in a wide range of corrosion ratio for engineering practice.
作者：
Zhang, Xiao-Hong;Algehyne, Ebrahem A.;Alshehri, Maryam G.;Bilal, Muhammad;Khan, Muhammad Altaf;...
期刊：
PLOS ONE,2021年16(8):e0254457 ISSN：1932-6203
作者机构：
[Zhang, Xiao-Hong] Hunan City Univ, Coll Sci, Yiyangt, Peoples R China.;[Algehyne, Ebrahem A.; Alshehri, Maryam G.] Univ Tabuk, Dept Math, Fac Sci, Tabuk, Saudi Arabia.;[Algehyne, Ebrahem A.] Univ Tabuk, Nanotechnol Res Unit NRU, Tabuk, Saudi Arabia.;[Bilal, Muhammad] City Univ Sci & Informat & Technol, Dept Math, Peshawar, Pakistan.;[Khan, Muhammad Altaf] Univ Free State, Inst Groundwater Studies, Fac Nat & Agr Sci, Bloemfontein, South Africa.
摘要：
The study explored the 3D numerical solution of an unsteady Ag-MgO/water hybrid nanofluid flow with mass and energy transmission generated by a wavy rotating disc moving up and down. The nanofluid is generated in the context of Ag-MgO nanomaterials. Magnesium oxide and silver nanoparticles have been heavily reported to have broad-spectrum antibacterial operations among metal oxides and metals. Silver nanoparticles are without a doubt the most commonly used inorganic nanoparticles, with numerous innovations in biomaterial's detection and antimicrobial operations. However, in current paper, the intention of the analysis is to boost thermal energy transmitting rates for a range of industrial implementations. When compared to a flat surface, energy transition is increased up to 15% due to the wavy swirling surface. The problem has been formulated as a system of PDEs, which included the Navier Stokes and Maxwell equations. Following that, the modeled equations are reduced to a dimensionless system of differential equations. The derived equations are then solved numerically using the Parametric Continuation Method (PCM). The findings are displayed graphically and debated. The geometry of a spinning disc is thought to have a positive impact on velocity and heat energy transfer. The insertion of nanostructured materials (silver and magnesium-oxide) increased the carrier fluid's thermal properties considerably. It is more effective at dealing with low energy transmission.
摘要：
In this study, the numerous solutions to Falkner–Skan flow of a Maxwell fluid with nanoparticles are investigated, considering the nonlinear radiation and magnetic domain. The flow described above can be expressed in accordance with PDEs that are transformed into ODEs by choosing suitable variables of similarity. The fourth- and fifth-order Runge–Kutta–Fehlberg method can be utilized to solve these reduced ODEs by applying the shooting approach. The graphs were drawn to explain the effects of different parameters on different fluid profiles for both the lower- and upper-branch solutions. This study shows that the velocity outlines improve both solutions by increasing local Deborah numbers slightly. Besides, an increase in radiation reduces the thermal gradient for both solutions, thereby reducing the concentration gradient for both solutions contributing to raised Brownian motion and Lewis numbers.
期刊：
Materials Research Express,2021年8(5):055303 ISSN：2053-1591
作者机构：
[Yang, Haiyang; Lang, Feng; Song, Ling; Li, Duxin; Shangguan, Jinfei] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.;[Yang, Haiyang; Song, Ling; Wang, Jin; Shangguan, Jinfei; Jiang, Qibin] Zhuzhou Times New Mat Technol Co Ltd, Zhuzhou 413000, Peoples R China.;[You, Yilan] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.
关键词：
MC nylon;polydimethylsiloxane;MoS2;friction performance
摘要：
MoS2 reinforced PDMS/MC nylon composites had been fabricated by in situ polymerization to further enhance the comprehensive properties of nylon material. Polydimethylsiloxane was pre-sythesized as the activator of the system and MoS2 was compounded as the wear-resisting agent. The thermal stability, mechanical properties, friction and wear properties of composites with different MoS2 contents were tested. The results showed that the crystallization and thermal stability of nylon matrix were increased with the addition of MoS2, while the tensile strength and impact strength were slightly reduced. The composites finally presented excellent friction properties with 3 wt% MoS2, whose friction coefficient was reduced to 0.75 (18.48% decrease) corresponding to the wear rate of 0.4145 x 10(-8) g Nm(-1).
作者机构：
[Huang, Changjun; Zhou, Qingshan; Cao, Yuanzhi] Hunan City Univ, Sch Municipal & Surveying Engn, Yiyang 413000, Peoples R China.;[Huang, Changjun] Key Lab Key Technol Digital Urban Rural Spatial P, Yiyang 413000, Peoples R China.;[Zhou, Lv] Guilin Univ Technol, Sch Geomat & Geoinformat, Guilin 541004, Peoples R China.
通讯机构：
[Changjun Huang] S;School of Municipal and Surveying Engineering, Hunan City University, Yiyang, China<&wdkj&>Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, Yiyang, China
摘要：
Landslide is a global environmental geological hazard caused by natural or human activities. Since the impoundment of the Three Gorges reservoir area, the geological disasters such as collapses, landslides and other kinds of geological disasters increased obviously due to the periodic fluctuation of the water level in the Yangtze River. Wanzhou District is located in the center of the Three Gorges Reservoir Area, which plays an important role in the prevention and control of geological hazards in the whole Three Gorges Reservoir Area. This is because a large number of deep bedrocks old landslides are distributed among this region, such as Taibaiyan ancient landslide, Caojiezi ancient landslide, Anlesi ancient landslide, Pipaping ancient landslide, and Diaoyanping ancient landslide. In this study, Quasi-Persistent Scatterers InSAR (QPS-InSAR) time-series method is proposed to identify and monitor the ancient landslides in Wanzhou. In this method, the High-coherent test is applied to Quasi-Persistent Scatterers (PSC) selection, and PSC and persistent scatterer are combined to improve the density of measurement points in vegetation area. The QPS-InSAR method is also characterized by the appropriate combination of differential interferograms produced by a Minimum Spanning Tree and the employment of the phase triangulation algorithm to estimate the optimal phase. This technique was performed on 8 scenes of L-band ALOS PALSAR ascending data acquired during 2015-2018, then deformation rate maps and time series for ancient landslide were generated, which were applied to retrieve time series displacement for the large-scale landslide in Wanzhou District. The experiment results show that there are obvious landslide deformation patterns detected in this region with displacement velocity larger than - 21 mm/yr during the observation period. Finally, the influencing factors such as geological conditions, distribution of rainfall and reservoir water level change in the Three Gorges Reservoir area, and deformation mechanism of Wanzhou landslide are analyzed. The monitoring results will help the local government to carry out regular landslide inspection and strengthen landslide disaster early warning.
作者：
Xiong, Pei-Ying;Almarashi, Adel;Dhahad, Hayder A.;Alawee, Wissam H.;Abusorrah, Abdullah M.;...
期刊：
Journal of Molecular Liquids,2021年330:115591 ISSN：0167-7322
通讯作者：
Yu-Ming Chu
作者机构：
[Xiong, Pei-Ying] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Almarashi, Adel] Jazan Univ, Coll Sci, Dept Math, Post Box 2097,New Campus, Jazan, Saudi Arabia.;[Dhahad, Hayder A.] Univ Technol Baghdad, Mech Engn Dept, Baghdad, Iraq.;[Alawee, Wissam H.] Univ Technol Baghdad, Control & Syst Engn Dept, Baghdad, Iraq.;[Alawee, Wissam H.] Univ Technol Baghdad, Training & Workshops Ctr, Baghdad, Iraq.
通讯机构：
[Yu-Ming Chu] D;Department of Mathematics, Huzhou University, Huzhou 313000, PR China
关键词：
Magnetic force;Exergy;Convection;Permeable space;Nanomaterial;Entropy
摘要：
Numerical simulation of hybrid nanomaterial free convection with helps of CVFEM was performed. Dispersing nanomaterial can minimize the exergy loss. The modeling outputs were depicted in terms of 3D plots and contours. Because of reduction of irreversibility with inclusion of nanoparticles, hybrid nanofluid was employed. Increasing Ha results in greater X-d and it is more sensible when convection become stronger. The growth of permeability increases nanomaterial motion and reduces the exergy drop. (C) 2021 Elsevier B.V. All rights reserved.
