Abstract
The existence of active material in the environment causes the small-scale systems to be sensitive to the actual environment. Carbon dioxide is one of the active materials that exists a lot in the air conditions of the living environment. However, in some applications, the carbon dioxide-coated is used to improve the performance of systems against the destructive factors such as the corrosion; nevertheless, in the current research, the stability analysis of a carbon dioxide capture mechanism-coated beam is investigated according to the mathematical simulation of a rectangular composite beam utilizing the modified couple stress theory. The composite mechanism of carbon dioxide trapping is made of a polyacrylonitrile substrate that supports a cross-link polydimethylsiloxane gutter layer as the carbon dioxide mechanism trapping. Three novel types of carbon dioxide trapping mechanism involving methacrylate, poly (ethylene glycol) methyl ether methacrylate, and three pedant methacrylates are considered, which were introduced by Fu et al. (2016). Finally, according to introducing the methodology of carbon dioxide (CO2) trapping, the impact of various effective parameters on the stability of composite beams will be analyzed in detail.
Key Words
carbon dioxide trapping; mathematical modelling; stability analysis; trapping material mechanism
Address
Yunlong Zhou and Jian Wang: College of energy and power engineering, Northeast Electric Power University, Jilin 132031, Jilin, China
Abstract
The pumpability of the grouts is significant issue in concept of the rheological and workability properties during penetrating to voids and cracks. To improve the fluidity features of the grout mixes, the usage of Colloidal Nano Particular Powders (CNPPs) with mineral additives such as fly ash (FA) can contribute. Therefore, the main purpose of this study can be explained as investigating the usage effects of four types of Colloidal Nano Particular Powders (n-TiO2, n-ZnO, n-Al2O3 and n-SiO2) as nano additives on the rheological, workability and bleeding properties of cement-based grout incorporated with fly as. Test results showed that the usage of FA in the grout samples positively contribute to increase on the fluidity of the grout samples as expected. The dilatant behavior was observed from the results for all mixes. Observing the effect of nano-sized additives in such cement-based grout mixtures with high fluidity has presented remarkable effects in this study.
Key Words
carbon dioxide trapping; mathematical modelling; stability analysis; trapping material mechanism
Address
Fatih Celik and Samet M. Bozkir: Department of Civil Engineering, Nigde Omer Halisdemir University, Nigde, Turkey
Oguzhan Yildiz: Department of Electricity and Energy, Nigde Technical Vocational School, Nigde Omer Halisdemir University, Nigde, Turkey
Abstract
The optimization for dynamic response associated with a cylindrical shell which is made of laminated composites embedded in a piezoelectric layer which is subjected to temperature rises and is resting on an elastic foundation is investigated for the first time. The first shear order theory (FSDT) is utilized in order to obtain the strain relations of the shell. Then, using the energy method, the equations of motions as well as boundary condition of the problem are attained. The formulation of this study together with the solution procedure which is a numerical solution method, differential quadrature method (DQM) is validated using other researches. This paper presents a thorough study on the parameters which impacts the vibration frequency of the laminated shell. The results of this paper shows that any type of laminated composite shell can reduce the vibration frequency providing that the angle related to layer are higher than 85 degrees. Also, in order to reduce the effect of temperature rises, the laminated composites instead of orthotropic one can be used.
Key Words
dynamic responses; laminated multiphase shell; optimization; thermo-electro-mechanical conditions
Address
Linyuan Fan: College of Mathematics and Data Science, Minjiang University, 350108, Fujian, Fuzhou, China
Degang Kong: College of Mechanical and Electrical Engineering, Hebei Agricultural University, Baoding 071001, Hebei, China
Jun Song: School of Civil Engineering, Shandong Jiaotong University, Jinan, 250357, Shandong, China/ China Communications Second Highway Survey, Design and Research Institute Co., Ltd, Wuhan 430050, Hubei, China
Zohre Moradi: Department of Electrical Engineering, Faculty of Engineering and Technology, Imam Khomeini International University, 34149-16818 Qazvin, Iran
Maryam Safa: Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam
Mohamed Amine Khadimallah: Prince Sattam Bin Abdulaziz University, College of Engineering, Civil Engineering Department, Al-Kharj, 16273, Saudi Arabia/ Laboratory of Systems and Applied Mechanics, Polytechnic School of Tunisia, University of Carthage, Tunis, Tunisia
Abstract
The present research investigates the dynamic behavior of a rotating functionally graded (FG) nonlocal cylindrical beam. The cylindrical beam is mathematically modeled via third-order beam theory linked with nonlocal strain gradient theory. The tube structure is made of functionally graded materials composed of Aluminum oxide coated on the Nickel, which the mechanical properties vary in the tube radius direction according to the power law. The bending harmonic force is applied in the tube length middle. The nonlocal spinning equations of the tube are derived via the energy method of the Hamilton principle, and they are solved via a robust numerical procedure for different boundary conditions. The main application of the rotating nanostructures is for the production of small-scale motors and devices and the drug-delivery application, the presented results can help the researcher have a better view regarding the different conditions.
Key Words
dynamic analysis; functionally graded material; nanotube; spinning nanostructures
Address
Yang Liu, Xiaofeng Wang, Li Liu, Bin Wu and Qin Yang: School of intelligent manufacturing, Changchun Sci-Tech University, Changchun, China 130600
Abstract
The nonlinear dynamic behavior of a nonuniform small-scale nonlocal beam is investigated in this work. The nanobeam is theoretically modeled using the nonlocal Eringen theory, as well as a few of Von-nonlinear Kármán's theories and the classical beam theory. The Hamilton principle extracts partial differential equations (PDE) of an axially functionally graded (AFG) nano-scale beam consisting of SUS304 and Si3N4 throughout its length, and an elastic Winkler-Pasternak substrate supports the tapered AFG nanobeam. The beam thickness is a function of beam length, and it constantly varies throughout the length of the beam. The numerical solution strategy employs an iteration methodology connected with the generalized differential quadratic method (GDQM) to calculate the nonlinear outcomes. The nonlinear numerical results are presented in detail to examine the impact of various parameters such as nonlinear amplitude, nonlocal parameter, the component of the elastic foundation, rate of cross-section change, and volume fraction parameter on the linear and nonlinear free vibration characteristics of AFG nanobeam.
Address
Wenjuan Yi: School of Information Engineering and Technology, Qingdao Vocational and Technical College of Hotel Management, Qingdao 266100, Shandong, China
Abstract
This paper studied the peristaltic transport of upper convected Maxwell nanofluid through a porous medium in a heated (isothermal) symmetric vertical channel. The nanofluid is assumed to be electrically conducting in the presence of a uniform magnetic field. These phenomena are modeled mathematically by a differential equations system by taking low Reynolds number and long-wavelength approximation, the yield differential equations have solved analytically. A suggested new technique to display and discuss the trapping phenomenon is presented. We discussed and analyzed the pumping characteristics, heat function, flow velocity and trapping phenomena which were illustrated graphically through a set of figures for various values of parameters of the problem. The numerical results show that, there are remarkable effects on the vertical velocity, pressure gradient and trapping phenomena with the thermal change of the walls.
Key Words
heated channel; magnetic field; peristalsis; upper-convected maxwell nanofluid
Address
Z. M. Gharsseldien: Department of Mathematics, Faculty of Science (Men), Al-Azhar University, Nasr City,11884, Cairo, Egypt
A.S. Awaad: Department of Mathematics, College of Arts and Science, Prince Sattam Bin Abdul-Aziz University,
054-11991 Wadi Adwassir, Riyadh, Saudi Arabia/ Department of Mathematics, Faculty of Science (Girls), Al-Azhar University, Nasr City,11754, Cairo, Egypt
Abstract
Drug self-delivery systems can easily realize combination drug therapy and avoid carrier-induced toxicity and immunogenicity because they do not need non-therapeutic carrier materials. So, designing appropriate drug self-delivery systems for specific diseases can settle most of the problems existing in traditional drug delivery systems. Retinal pigment epithelium is very important for the homeostasis of retina. However, it is vulnerable to oxidative damage and difficult to repair. Worse still, the antioxidants can hardly reach the retina by non-invasive administration routes due to the ocular barriers. Herein, the targeted group (folic acid) and antioxidant (melatonin) have been grafted on the surface of ZnO quantum dots to fabricate a new kind of drug self-delivery systems as a protectant via eyedrops. In this study, the negative nanoparticles with size ranging in 4~6 nm were successfully synthesized. They could easily and precisely deliver drugs to retinal pigment epithelium via eyedrops. And they realized acid degradation to controlled release of melatonin and zinc in retinal pigment epithelium cells. Consequently, the structure of retinal pigment epithelium cells were stabilized according to the expression of ZO-1 and Β-catenin. Moreover, the antioxidant capacity of retinal pigment epithelium were enhanced both in health mice and photic injury mice. Therefore, such new drug self-delivery systems have great potential both in prevention and treatment of oxidative damage induced retinal diseases.
Key Words
antioxidation; combination drug therapy; drug self-delivery system; retinal pigment epithelium; zinc oxide
Address
Caixia Yi, Xin Sun, Xi Zheng and Shuangya Yang: School of Sports and Health Science, Tongren University, Tongren 554300, P. R. China
Zhihai Yu and Hengchuan Liu: Department of Urology, Chongqing University Three Gorges Hospital, Chongqing 404000, P. R. China
Yi Song: Department of Neurosurgery, Chongqing University Three Gorges Hospital, Chongqing 404000, China
Xiao Huang: School of Sports and Health Science, Tongren University, Tongren 554300, P. R. China/ School of Physical Education, Guangxi University of Science and Technology, Liuzhou 545006, China
Abstract
In the present article, silica nanoparticles (SNPs) were exploited to improve the tribological and mechanical properties of vinyl ester/glass fiber composites. To the best of our knowledge, there hasn't been any prior study on the wear properties of glass fiber reinforced vinyl ester SiO2 nanocomposites. The wear resistance is a critical concern in many industries which needs to be managed effectively to reduce high costs. To examine the influence of SNPs on the mechanical properties, seven different weight percentages of vinyl ester/nano-silica composites were initially fabricated. Afterward, based on the tensile testing results of the silica nanocomposites, four wt% of SNPs were selected to fabricate a ternary composite composed of vinyl ester/glass fiber/nano-silica using vacuum-assisted resin transfer molding. At the next stage, the tensile, three-point flexural, Charpy impact, and pin-on-disk wear tests were performed on the ternary composites. The fractured surfaces were analyzed by scanning electron microscopy (SEM) images after conducting previous tests. The most important and interesting result of this study was the development of a nanocomposite that exhibited a 52.2% decrease in the mean coefficient of friction (COF) by augmenting the SNPs, which is beneficial for the fabrication/repair of composite/steel energy pipelines as well as hydraulic and pneumatic pipe systems conveying abrasive materials. Moreover, the weight loss due to wearing the ternary composite containing one wt% of SNPs was significantly reduced by 70%. Such enhanced property of the fabricated nanocomposite may also be an important design factor for marine structures, bridges, and transportation of wind turbine blades.
Key Words
coefficient of friction; energy applications; mechanical properties; SiO2 vinyl ester nanocomposites; wear resistance; wind turbine blades
Address
Navid Sokhandani and AliReza Setoodeh: Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz 71555, Iran
Seyed Mojtaba Zebarjad: Department of Materials Science and Engineering, Engineering Faculty, Shiraz University, Shiraz, 7194685115, Iran
Kamran Nikbin: Department of Mechanical Engineering, Imperial College London, London SW7 2AZ. UK
Greg Wheatley: College of Science and Engineering, James Cook University, Townsville QLD Australia
