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.;[Salehi, Fatemeh] Macquarie Univ, Sch Engn, Sydney, NSW, Australia.;[Jafaryar, M.] Babol Noshirvani Univ Technol, Renewable Energy Syst & Nanofluid Applicat Heat T, Babol, Iran.;[Bach, Quang-Vu] Ton Duc Thang Univ, Fac Environm & Labour Safety, Sustainable Management Nat Resources & Environm R, Ho Chi Minh City, Vietnam.
通讯机构:
[Bach, Quang-Vu] T;Ton Duc Thang Univ, Fac Environm & Labour Safety, Sustainable Management Nat Resources & Environm R, Ho Chi Minh City, Vietnam.;Ton Duc Thang Univ, Fac Environm & Labour Safety, Ho Chi Minh City, Vietnam.
关键词:
Nanomaterial;Convective instability;Throughflow and inconsistency gravity;Permeable medium
摘要:
In the current article, the impact of varying gravitational field and flow on the beginning of nanofluid convective instability in a permeable medium layer is studied numerically utilizing Galerkin technique. The permeable layer is directed to a regular vertical throughflow and irregular descendent gravitational force which changes with the length from the layer. The influences of three types of gravitational force inconsistency: (a) linear, (b) parabolic, and (c) exponential are examined on the formation of nanofluid convective instability with vanish nanoparticle flux condition at the plates. Results proved that the throughflow factor
$$Q$$
and gravity inconsistency factor
$$\delta$$
suspend the start of convective instability, while thenanoparticle Rayleigh-Darcy number
$$R_{{{\text{np}}}}$$
and the altered diffusivity ratio
$${\text{NA}}_{{{\text{nf}}}}$$
quick the start of nanofluid convection. The measurement of the convective cells diminishes with
$$R_{{{\text{np}}}}$$
and
$${\text{NA}}_{{{\text{nf}}}}$$
, while
$$Q$$
,
$$\delta$$
and the altered nanofluid Lewis number
$${\text{Le}}_{{{\text{nf}}}}$$
have duel effects on the measurement of convective cells.
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.;[Kumar, Rakesh] Cent Univ Himachal Pradesh, Sch Math Comp & Informat Sci, Dharamshala, India.;[Bach, Quang-Vu] Ton Duc Thang Univ, Fac Environm & Labour Safety, Sustainable Management Nat Resources & Environm R, Ho Chi Minh City, Vietnam.
通讯机构:
[Bach, Quang-Vu] T;Ton Duc Thang Univ, Fac Environm & Labour Safety, Sustainable Management Nat Resources & Environm R, Ho Chi Minh City, Vietnam.
关键词:
Shape of nanoparticles;Darcy law;Radiation;Lorentz forces;Nanomaterial;Convection
摘要:
Visual object tracking is a significant technology for camera-based sensor networks applications. Multilayer convolutional features comprehensively used in correlation filter (CF)-based tracking algorithms have achieved excellent performance. However, there are tracking failures in some challenging situations because ordinary features are not able to well represent the object appearance variations and the correlation filters are updated irrationally. In this paper, we propose a local-global multiple correlation filters (LGCF) tracking algorithm for edge computing systems capturing moving targets, such as vehicles and pedestrians. First, we construct a global correlation filter model with deep convolutional features, and choose horizontal or vertical division according to the aspect ratio to build two local filters with hand-crafted features. Then, we propose a local-global collaborative strategy to exchange information between local and global correlation filters. This strategy can avoid the wrong learning of the object appearance model. Finally, we propose a time-space peak to sidelobe ratio (TSPSR) to evaluate the stability of the current CF. When the estimated results of the current CF are not reliable, the Kalman filter redetection (KFR) model would be enabled to recapture the object. The experimental results show that our presented algorithm achieves better performances on OTB-2013 and OTB-2015 compared with the other latest 12 tracking algorithms. Moreover, our algorithm handles various challenges in object tracking well.
摘要:
This paper discusses how the arrangement of fins can affect the charging process. Mixture of paraffin and copper oxide nanomaterial has been utilized. Several configurations of fins with various position, thickness and length were discussed. Volume fraction of NEPCM in domain is constant, thus reducing melting time is criterion for good efficiency. Outputs reveal that with incorporating fins in both sides, melting process becomes more uniform. Lower melting time with using longer fins is a result of more effective buoyancy forces by dividing the whole domain into smaller blocks. Using fins over both inner and outer pipes shorten the melting time. The main purpose of current modeling is finding the optimized style of fins to gain the highest performance. Nice accommodation of outputs with empirical previous data indicates the verification of code. (C) 2020 Elsevier B.V. All rights reserved.
摘要:
Significant progress is made in the field of object tracking recently. Especially, trackers based on deep learning and correlation filters both have achieved excellent performance. However, object tracking still faces some challenging problems such as deformation and illumination. In such kinds of situations, the accuracy and precision of tracking algorithms plunge as a result. It is imminent to find a solution to this situation. In this paper, we propose a tracking algorithm based on features extracted by residual network called Resnet features and cascaded correlation filters to improve precision and accuracy. Firstly, features extracted by a deep residual network trained on other image processing datasets, are robust enough and retain higher resolution, therefore, we exploit Resnet-101 pretrained offline to obtain features extracted by middle and high layers for target appearance model representation. Resnet-101 is deeper compared with other deep neural networks which means it contains more semantic information. Then, the method we propose to combine our correlation filters is superior. We propose cascaded correlation filters generated by handcraft, middle-level and high-level features from residual network to gain better competence. Handcraft features localize target precisely because they contain more spatial details while Resnet features are robust to the target appearance change because they retain more semantic information. Finally, we conduct extensive experiments on OTB2013 and OTB2015 benchmark. The experimental results show that our tracker achieves high performance under all kinds of challenges and performs favorably against other state-of-the-art trackers.
通讯机构:
[Li, Guang-Li] H;Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China. Electronic address:
关键词:
Black phosphorus;Modified electrode;Electrochemiluminescence;Enzyme;Aptamer;Electrochemical immunosensor
摘要:
Since the discovery of liquid-phase-exfoliated black phosphorus (BP) as a field-effect transistor in 2014, BP, with its 2D layered structure, has attracted significant attention, owing to its anisotropic electro-conductivity, tunable direct bandgap, extraordinary surface activity, moderate switching ratio, high hole mobility, good biocompatibility, and biodegradability. Several pioneering research efforts have explored the application of BP in different types of electrochemical sensors. This review summarizes the latest synthesis methods, protection strategies, and electrochemical sensing applications of BP and its de-rivatives. The typical synthesis methods for BP-based crystals, nanosheets, and quantum dots are dis-cussed in detail; the degradation of BP under ambient conditions is introduced; and state-of-the-art protection methodologies for enhancing BP stability are explored. Various electrochemical sensing ap-plications, including chemically modified electrodes, electrochemiluminescence sensors, enzyme elec-trodes, electrochemical aptasensors, electrochemical immunosensors, and ion-selective electrodes are discussed in detail, along with the mechanisms of BP functionalization, sensing strategies, and sensing properties. Finally, the major challenges in this field are outlined and future research avenues for BP-based electrochemical sensors are highlighted. (c) 2021 Elsevier B.V. All rights reserved.
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.
摘要:
In this study, thermal conductivity of graphene nano-sheets (GNs)/ethylene glycol (EG) nanofluidwas compared with EG thermal conductivity at 25-70 degrees C and 0.005-0.5 wt% to examine the effects of GNs nanoparticles. For all samples, presence of nanoparticles intensifies EG thermal conductivity up to 54.6%. Moreover, loading GNs into EG inverts the dependency of the thermal conductivity to temperature. As the temperature rises, the thermal conductivity of the base fluid decreases, while for nanofluid, thermal conductivity increases. Based on the results, by incorporating more nanoparticles, the positive effects of nanoparticles on thermal conductivity s reduced. It was concluded that with increasing temperature, the effect of adding GNs on the thermal conductivity is strengthened. Neural network implementation showed that this method can forecast k(GNs)/EC/k(EG) with maximum error of less than 3%. (C) 2021 Elsevier B.V. All rights reserved.
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.
作者:
Wang, Tong;Almarashi, Adel;Al-Turki, Yusuf A.;Abu-Hamdeh, Nidal H.;Hajizadeh, Mohammed Reza;...
期刊:
Journal of Molecular Liquids,2021年329:115052- ISSN:0167-7322
作者机构:
[Wang, Tong] Huazhong Univ Sci & Technol, Sch Architecture & Urban Planning, Dept Landscape Architecture, Wuhan, Hubei, Peoples R China.;[Almarashi, Adel] Jazan Univ, Coll Sci, Dept Math, Post Box 2097,New Campus, Jazan, Saudi Arabia.;[Al-Turki, Yusuf A.; Abu-Hamdeh, Nidal H.] King Abdulaziz Univ, Fac Engn, Ctr Res Excellence Renewable Energy & Power Syst, Jeddah 21589, Saudi Arabia.;[Al-Turki, Yusuf A.] King Abdulaziz Univ, Fac Engn, Dept Elect & Comp Engn, Jeddah 21589, Saudi Arabia.;[Abu-Hamdeh, Nidal H.] King Abdulaziz Univ, Fac Engn, Dept Mech Engn, Jeddah 21589, Saudi Arabia.
关键词:
Nanomaterial;Heat release;Galerkin approach;Wavy tank;Radial fins
摘要:
In this research, sinusoidal tank including inner circular cylinder was considered and to expedite the solidification, radial fins were installed over the inner cold cylinder. To improve the conduction, CuO nano sized material was added and effects of size of particles were involved. The governing equations consist of energy equation with one source term of solid fraction and equation for distribution of ice fraction. To fins the solution, Galerkin approach was applied and different mesh configuration in various time step helps to capture the phenomena more accurate. Validation with experimental data shows the nice accommodation. So, influence of fins length and diameter of particles were imposed. As longer fins were employed, the solidification time reduces about 3.74% when d(p) = 40. As d(p) rises from 40 to 50, temperature augments and greater energy has been achieved because of augmentation of needed time from 175.44 to 264.05 s. Impact of dp on isotherms is more significant than fins length. (C) 2020 Elsevier B.V. All rights reserved.
作者机构:
[Waqas, Hassan; Farooq, Umar] Govt Coll Univ Faisalabad, Dept Math, Layyah Campus, Faisalabad 31200, Pakistan.;[Khan, M. Ijaz] Riphah Int Univ, Dept Math & Stat, I-14, Islamabad 44000, Pakistan.;[Khan, Sami Ullah] COMSATS Univ Islamabad, Dept Math, Sahiwal 57000, Pakistan.;[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.
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:
The nanoparticles proved a motivating research area in the fourth generation of the world due to their extensive use in science and infrastructure, such as vehicle cooling, higher heat transfer rates in microchips, food manufacturing, biotechnology, biochemistry, transportation, metrology and nuclear reactors. Dispersing the nanoparticles within base fluid is a newly approach for implementations of heat transfer and biomedicine/bioengineering. The current determination is committed to explore the features of bioconvection in Carreau nanofluid flow under the influence of various thermal consequences. The flow is originated by a stretched cylinder. The characteristics of Cattaneo-Christov heat and mass flux are applied to examine the heat/mass transportation of nano fluid. The effects of thermal radiation and activation energy are also considered. The consequences of Brownian movement and thermophoresis features are analyzed by incorporating Buongiorno's nanofluid model. The governing partial differential equations are transmuted into the structure of nonlinear ordinary differential equations by introducing suitable transformation. The shooting technique is used to achieve the numerical simulations of nonlinear system. The physical impacts of prominent parameters on velocity, temperature distribution, concentration field and microorganisms profile are examined and captured graphically. The numerical outcomes against various flow quantities are also presented in tabular form. The results convey that a higher temperature profile is observed with larger values of thermal Biot number, exponential base sink parameter and thermal relaxation parameter while a decrement in temperature is noticed with increasing mixed convection parameter. The concentration profile shows an increasing trend with mass concentration parameter and concentration relaxation parameter. Moreover, the microorganism field decline with Peclet number and bioconvection Lewis number. (C) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
作者:
Chu, Yu-Ming;Bilal, Sardar*;Hajizadeh, Mohammed Reza*
期刊:
Mathematical Methods in the Applied Sciences,2020年 ISSN:0170-4214
通讯作者:
Bilal, Sardar;Hajizadeh, Mohammed Reza
作者机构:
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou, Peoples R China.;[Chu, Yu-Ming] Changsha Univ Sci & Technol, Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha, Peoples R China.;[Bilal, Sardar] Air Univ, Dept Math, PAF Complex E-9, Islamabad 44000, Pakistan.;[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, Vietnam.
通讯机构:
[Bilal, Sardar] A;[Hajizadeh, Mohammed Reza] D;Air Univ, Dept Math, PAF Complex E-9, Islamabad 44000, Pakistan.;Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam.
关键词:
CVFEM;Darcy porous medium;hybridized nanofluid by Ferro particles;magnetic field effectiveness;multi walled carbon nanotubes (MWCNT);natural convection
摘要:
Current pagination concerns with exploration regarding thermal characteristics induced by hybridization of Fe3O4 with MWCNT in a permeable tank filled with viscous fluid with magnetization. Roseland approximation is obliged to configure radiative heat flux aspects. Modeling and structuring of considered problem is established in partial differential setup. CVFEM is implemented to seek out solution of constructed differential layout. Data establishing properties of Fe3O4 with MWCNTs is disclosed in tabular format. Impression of sundry variables in view of isotherm and stream pattern is divulged. Local convective thermal rate against involved variables in 3D snapshots is captured. Test about grid independence and comparison with conducted work to get assurance of present finding is explicated. It is deduced that heat transfer along walls enhances verses Rayleigh and Darcy parameters whereas delineates against mounting effect of magnetic field parameter.
摘要:
The main goal of this attempt is achieving higher rate of solidification with employing two passive techniques. Mixing the based PCM with nanoparticles and considering the wavy shape for walls were two techniques were incorporated. Copper oxide nanomaterial was dispersed in to water with concentration of 0.04 which let us employing homogeneous model. Based on this fact, empirical formulations were utilized for predicting features of NEPCM and various shapes of nano sized particles were considered in thermal conductivity formula. Due to inherent of solidification phenomena, buoyancy can be ignored and pure conduction mechanism with involving the transient source term of solid faction was solved by means of FEM. During the process, the configurations of grids change and the regions around the solid front have finer grid. This opportunity offers outputs with greater accuracy. As shape factor rises, the greater conduction mode can be obtained and similar behavior can be achieved with considering greater amplitude of wavy walls. The best case in term of discharging time is that of m 5.7 and A = 05 in which 156.17 s required to finish the process. Greater amount of shape factor can decrease the time about 5.91% and 5.89% when A = 05 and 0.1, respectively. Also, with growth of A. time reduces about 22.66% which indicate better solidification rate. Inclusion of nanoparticles can improve the discharging rate about 17.9%. (C) 2020 Elsevier B.V. All rights reserved.
作者:
Chu, Yu-Ming;Hajizadeh, Mohammed Reza;Li, Z.;Quang-Vu Bach*
期刊:
Journal of Molecular Liquids,2020年318:114321 ISSN:0167-7322
通讯作者:
Quang-Vu Bach
作者机构:
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313100, Peoples R China.;[Chu, Yu-Ming] Changsha Univ Sci & Technol, Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha 410114, Peoples R China.;[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.;[Li, Z.] Univ Wollongong, Sch Mech Mat Mechatron & Biomed Engn, Wollongong, NSW 2522, Australia.
通讯机构:
[Quang-Vu Bach] T;Ton Duc Thang Univ, Fac Environm & Labour Safety, Ho Chi Minh City, Vietnam.
关键词:
Melting;Nanoparticle;Air conditioning;FVM;PCM;Exergy loss
摘要:
For achieving greater efficiency of ventilating unit for a room, PCM has been utilized and needed heat for melting process has been provided from hot air flow. The air gets warmer due to higher solar radiation and such hot air makes the PCM to melt. To augment the heat absorption, CuO nanoparticles were dispersed in to RT28. We assumed that there is no slip velocity between nanoparticles and paraffin. FVM was utilized to show the treatment of NEPCM during melting and for verification, previous article was tested. Not only temperature of air but also NEPCM temperature augments with progress of process. Considering larger amplitude, NEPCM temperature augments and maximum difference has been reported for highest time. Air temperature of two cases becomes equal at t = 38 h. As time progress more, temperature of air for grater amplitude becomes greater. At t = 50 h, with rise of a form 5 to 10, temperature of NEPCM and air rise about 0.071% and 0.19%, respectively. Exergy loss augments with rise of amplitude about 55.38% when t = 20 h. When a = 10, increase of time from 5 to 20 h causes to augment of exergy loss about 35.15%. (C) 2020 Elsevier B.V. All rights reserved.