Abstract
In order to develop better method to enhance and control the flow and heat transfer inside the radiator of electronic device, the synergistic effect of MHD nanofluids and porous medium on the flow and heat transfer in rectangular opened channel is simulated using Lattice Boltzmann method. Three nanofluids of CuO-water, Al2O3-water and Fe3O4-water are studied to analyze the influence of the type of nanofluid on the synergistic effect. The simulation results show that the porous medium can increase the flow velocity in fluid zone adjacent to the porous medium and enhance the heat transfer on the surface of the channel. Under no magnetic field, when the porosity of porous medium is 0.8, the Nusselt number is 4.46% higher than when the porosity is 0.9. Al2O3-water has the best heat transfer effect among the three nanofluids. At ø=0.06, Ha=100, Θ=90°, ε=0.9, Nu of Al2O3-water is 6.51% larger than that of CuO-water and 5.05% larger than that of Fe3O4-water. Magnetic field enhances seepage in porous medium and inhibits heat transfer in the bottom wall. When Ha=30 and 60, the inhibiting effect is the most significant as the magnetic field angle is 90°. And when Ha=100, the inhibiting effect is the most significant as the magnetic field angle is 120°.
Key Words
heat transfer; LBM; MHD; nanofluid; porous medium
Address
Xiangyang Liu, Jimin Xu, Tianwang Lai and Maogang He: Key Laboratory of Thermal Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, No.28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
Abstract
The possibility of energy harvesting as well as vibration of a three-layered beam consisting of two piezoelectric layers and one core layer made of nonpiezoelectric material is investigated using nonlocal strain gradient theory. The three-layered nanobeam is resting on an elastic foundation. Hamilton's principle is used to derive governing equations and associated boundary conditions. The generalized differential quadrature method (GDQM) was used to discretize the equations, and the Newmark beta method was used to solve them. The size-dependency of the elastic foundation is considered using two-phase elasticity. The equations, as well as the solution procedure, are validated utilizing some compassion studies. This work can be a basis for future studies on energy harvesting of small scales.
Key Words
energy harvesting; forced vibration; nano composite; piezoelectric; vibration
Address
Zohre Moradi and Mohsen Davoudi: Faculty of Engineering and Technology, Department of Electrical Engineering, Imam, Khomeini International University, 34149-16818, Qazvin, Iran
Farzad Ebrahimi: Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran
Abstract
Nonlinearity plays an important role in control systems and the application of design. For this reason, in addition to linear vibrations, nonlinear vibrations of the stepped nanobeam are also discussed in this manuscript. This study investigated the vibrations of stepped nanobeams according to Eringen's nonlocal elasticity theory. Eringen's nonlocal elasticity theory was used to capture the nanoscale effect. The nanoscale stepped Euler Bernoulli beam is considered. The equations of motion representing the motion of the beam are found by Hamilton's principle. The equations were subjected to nondimensionalization to make them independent of the dimensions and physical structure of the material. The equations of motion were found using the multi-time scale method, which is one of the approximate solution methods, perturbation methods. The first section of the series obtained from the perturbation solution represents a linear problem. The linear problem's natural frequencies are found for the simple-simple boundary condition. The second-order part of the perturbation solution is the nonlinear terms and is used as corrections to the linear problem. The system's amplitude and phase modulation equations are found in the results part of the problem. Nonlinear frequency-amplitude, and external frequency-amplitude relationships are discussed. The location of the step, the radius ratios of the steps, and the changes of the small-scale parameter of the theory were investigated and their effects on nonlinear vibrations under simple-simple boundary conditions were observed by making comparisons. The results are presented via tables and graphs. The current beam model can assist in designing and fabricating integrated such as nano-sensors and nano-actuators.
Key Words
analytical modelling; nonlocal elasticity; stepped nanobeams; vibration
Address
Mustafa Oguz Nalbant:Department of Electronic and Automation, Soma Vocational School, Manisa Celal Bayar University, 45500 Soma, Manisa, Turkey
Süleyman Murat Bağdatli: Department of Mechanical Engineering, Manisa Celal Bayar University, Yunusemre, 45140 Manisa, Turkey
Ayla Tekin: Department of Machinery and Metal Technologies, Soma Vocational School, Manisa Celal Bayar University, 45500 Soma, Manisa, Turkey
Abstract
Combination of novel technologies with traditional physiotherapy in rehabilitation in injured athletes have shown to provide improved time of recovery. In specific, nanodrugs delivery systems are widely utilized as a counterpart to the physiotherapy in injuries in sports. In the present study, we focus on the common injuries in dance-sports, their recovery and the effect combination of nano-particle drug delivery with the physiotherapy practices. In this regard, a comprehensive review on the common injuries in dance sport is provided. Moreover, the researches on the effectiveness of the nano-particle drug delivery in therapy of such injuries and in similar cases are provided. The possibility of using combination of nano-particle drug delivery and physiotherapy is discussed in detail. Finally, using artificial intelligence methods, predictions on the recovery time and after-treatment side-effects is investigated. Artificial Neural Network (ANN) predictions suggested that using nano-particle drug delivery systems along with physiotherapy practices could provide shortened treatment time to recovery in comparison to conventional drugs. Moreover, the post-recover effects are less than the conventional methods.
Key Words
ANN; dance-sport; injury recovery; nano-drug; nano-particle drug delivery; physiotherapy
Address
Weixin Dong and Chunxia Lu: College of Physical Education, Hunan Normal University, Changsha 410081, Hunan, China
Gang Lu and Xia Liu: Shandong Zhanhua NO.2 Middle School, Binzhou 256800, Shandong, China
Yangling Jiang and Fan Zhou: Primary School Affiliated to Hunan Normal University, Changsha 410076, Hunan, China
Abstract
In the present study, we aim to use nanotechnology sensors/actuators to capture pressure and frequency of voice singers and to send signals for improving breathing pressure. In this regard, a circular composite structure having 3 different layers are used. The core layer is nano-composite material reinforced with graphene nanoplatelets. The face sheets are piezo electric materials connected to electrical circuit capable of measuring and applying voltage to the piezoelectric layers. This sensors have extremely smaller size than conventional sensors attached to the neck of singer and, hence, minimizes the influences on the output voice of the singer. A brief theoretical framework are presented for nonlocal strain gradient theory and geometry of the sensor is described in detail. The controlling procedure along with experimental results on 20 amateur and professional singer participants are also presented. The results of the study indicate that the participants could gain benefit from the device for improving their ability in phonation and keeping their frequency at a constant level although they have difficulty in the beginning of the experiment getting used to the device.
Key Words
ANN; breath pressure control; nano-sensors; subglottal pressure; vocal music; voice frequency
Address
Jiayue Cui: Harbin Normal University, Harbin 150025, Heilongjiang, China/ Harbin Conservatory of Music, Harbin 150025, Heilongjiang, China
Hongliang Zhang: Department of Art, Harbin Conservatory of Music, Harbin 150025, Heilongjiang, China
Abstract
This study investigates the application of nano-composite materials in physical education, specifically focusing on improving the performance of sports hall flooring. The research centers on carbon nanotube reinforced polyvinyl chloride (PVC) composites, which offer enhanced mechanical properties and durability. The incorporation of carbon nanotubes as reinforcements in the PVC matrix provides notable benefits, including increased strength, improved thermal stability, electrical conductivity, and resistance to fatigue. The key parameters examined in this study are the weight percentage of carbon nanotubes and the temperature during the fabrication process. Through careful analysis, it is found that higher weight percentages of carbon nanotubes contribute to a more uniform dispersion within the PVC matrix, resulting in improved mechanical properties. Additionally, higher fabrication temperatures aid in repairing macroscopic defects, leading to enhanced overall performance. The findings of this study indicate that the utilization of carbon nanotube reinforced PVC composites can significantly enhance the strength and durability of sports hall flooring. By employing these advanced materials, the safety and suitability of physical education environments can be greatly improved. Furthermore, the insights gained from this research can contribute to the optimization of composite material design and fabrication techniques, not only in the field of physical education but also in various industries where composite materials find applications.
Key Words
carbon nanotubes; nano-composites; physical education; polyvinyl chloride (PVC) composites; sports hall flooring
Address
Zhuli Li: College of Physical Education, Huangshan University, Huangshan 245041, Anhui, China
Song Peng: College of Physical Education, Sichuan University, Chengdu 610065, Sichuan, China
Gang Chen: College of Education, General Aviation Vocational College, Tianfu New Area, Sichuan, Meishan 620500, Sichuan, China
Abstract
The electron transport properties of Y-type zigzag branched carbon nanotubes (CNTs) are of great significance for micro and nano carbon-based electronic devices and their interconnection. Based on the semi-empirical method combining tight-binding density functional theory and non-equilibrium Green's function, the electron transport properties between the branches of Y-type zigzag branched CNT are studied. The results show that the drain-source current of semiconducting Y-type zigzag branched CNT (8, 0)-(4, 0)-(4, 0) is cut-off and not affected by the gate voltage in a bias voltage range [-0.5 V, 0.5 V]. The current presents a nonlinear change in a bias voltage range [-1.5 V, -0.5 V] and [0.5 V, 1.5 V]. The tangent slope of the current-voltage curve can be changed by the gate voltage to realize the regulation of the current. The regulation effect under negative bias voltage is more significant. For the larger diameter semiconducting Y-type zigzag branched CNT (10, 0)-(5, 0)-(5, 0), only the value of drain-source current increases due to the larger diameter. For metallic Y-type zigzag branched CNT (12, 0)-(6, 0)-(6, 0), the drain-source current presents a linear change in a bias voltage range [-1.5 V, 1.5 V] and is symmetrical about (0, 0). The slope of current-voltage line can be changed by the gate voltage to realize the regulation of the current. For three kinds of Y-type zigzag branched CNT with different diameters and different conductivity, the current-voltage curve trend changes from decline to rise when the branch of drain-source is exchanged. The current regulation effect of semiconducting Y-type zigzag branched CNT under negative bias voltage is also more significant.
Key Words
electron transport properties; semi-empirical method; Y-type zigzag branched carbon nanotube
Address
MaoSheng Ye, HangKong OuYang, YiNi Lin, Quan Yang, QingYang Xu and Li Ma: School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China
Tao Chen and LiNing Sun: Robotics and Microsystems Center, Soochow University, Suzhou 215021, China
Abstract
This research aims to explore factors influencing creativity among the employees of nanotechnology companies. Further, this survey aimed to investigate the role of psychological capital (PS), job satisfaction (JS) and corporate social responsibility (CSR) as sources to foster creativity. Participants included 375 employees of nanotechnology companies in China. Sequential mediation analysis revealed that creativity was significantly influenced by psychological capital, job satisfaction and corporate social responsibility. Furthermore, not only psychological capital, job satisfaction and corporate social responsibility were directly and indirectly related to creativity but also explained 67.35% variance of it. It seems that having more psychological resources, more well-being and good feelings concerning performance in the workspace and the efforts of companies to improve employee welfare are among the most important factors in increasing employee creativity. Our findings can help companies, especially nontechnology companies, in focusing on factors fostering the creativity of employees, because creativity enhances and promotes the performance and success of companies.
Key Words
corporate social responsibility; creativity; job satisfaction; nanotechnology companies; psychological capital
Address
Yuchun Li: School of Economics and Management, Xi'an University of Technology, Xi'an 710048, Shaanxi, China/ Business School, Durham University, DH1 3LE, Durham, UK
Meilin Li:School of Management, University of Leeds, LS2 9JT, Leeds, UK
Xiangtong Kong: Qufu Far East Vocational and Technical College. Qufu 273100, Shandong, China
Arefeh Baniasadi: Department of Psychology, Almahdi Mehr Higher Education Institute, Isfahan, Iran
Ahmed Hasan Shaker: Doctoral School of Business Administration, Bucharest University of Economic Studies, 6 Piat,a Romana, 1st District, 010371 Bucharest, Romania/ Department of Business Administration, Al-Mustaqbal University College, Babylon 51001, Iraq
H. Elhosiny Ali: Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia/ Advanced Functional Materials & Optoelectronic Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia/ Physics Department, Faculty of Science, Zagazig University, 44519 Zagazig, Egypt
