Reduction of Energy Consumption for Tire Test Room

This article presents a software-implemented 3-dimensional simulated analysis of a 4-tire test room and the 6-tire test room. The results of the average performance through the simulated analysis of 100 iterations were obtained. The simulation showed the temperature distribution in the test rooms. This objective of this study was to assess the efficiency of the start-up process in each test room and to find the most efficient setup. A promising improvement would be to install the heaters at the bottom of the room under the drums instead of at the ceiling. The results of the simulation will be compared to the data of temperature logging of the tire test rooms once there is availability upon the lifting of the Covid pandemic lockdown restrictions.

Design and Simulated Analysis of Low Heat Flux Cold Plate for High-power Power Electronics Equipment

The thesis has carried out design and simulated analysis of low flux cold plate for high-power power electronics equipment. First, according to heat distribution and design requirements, two kinds of flow passage for low flux cold plate is designed. Then performance characteristics simulation of different flow passage for cold plate is performed. And the heat dissipation characteristics of two kinds of flow passage can both meet the design requirements. Finally, from the perspective of high temperature, temperature difference, pressure drop and so on, the simulated results are comparative analysis. And it is helpful to the design and optimizing of cold plate for high-power power electronics equipment.

Printed Transformable Liquid-Metal Metamaterials and Their Application in Biomedical Sensing

Metamaterial is becoming increasingly important owing to its unique physical properties and breakthrough applications. So far, most metamaterials that have been developed are made of rigid materials and structures, which may restrict their practical adaptation performances. Recently, with the further development of liquid metal, some efforts have explored metamaterials based on such tunable electronic inks. Liquid metal has high flexibility and good electrical conductivity, which provides more possibilities for transformable metamaterials. Here, we developed a new flexible liquid-metal metamaterial that is highly reconfigurable and could significantly extend the working limit facing current devices. The printed electronics method was adopted to fabricate artificial units and then construct various potential transformable metamaterials. Based on metamaterial theory and printing technology, typical structured flexible liquid-metal electromagnetic metamaterials were designed and fabricated. The electronic and magnetic characteristics of the liquid-metal-based electromagnetic metamaterials were evaluated through simulated analysis and experimental measurement. Particularly, the potential of liquid-metal metamaterials in biomedical sensing was investigated. Further, the future outlook of liquid-metal metamaterials and their application in diverse categories were prospected.

Modeling of external self-excitation and force generation on magnetic nanoparticles inside vitreous cavity

<abstract> <p>The purpose of this manuscript was to design a better method for recovery from rhegmatogenous retinal detachment (RRD) surgery. We attempted to achieve this by designing a helmet that can manipulate intraocular magnetic nanoparticles (MNPs) and create a magnetic tamponade, eliminating the need for postoperative head positioning. A simulated analysis was developed to predict the pattern of magnetic force applied to the magnetic nanoparticles by external magnetic field. No participants were involved in this study. Instead, magnetic flux and force data for three different helmet designs were collected using virtual simulation tools. A prototype helmet was then constructed and magnetic flux and force data were recorded and compared to virtual data. For both virtual and physical scenarios, magnitude and direction of the resulting forces were compared to determine which design created the controlled direction and strongest forces into the back of the eye. Of the three virtual designs, both designs containing a visor had greater force magnitude than magnet alone. Between both designs with visors, the visor with bends resulted in forces more directed at the back of the eye. The physical prototype helmet shared similar measurements to virtual simulation with minimal percent error (Average = 5.47%, Standard deviation = 0.03). Of the three designs, the visor with bends generated stronger forces directed at the back of the eye, which is most appropriate for creating a tamponade on the retina. We believe that this design has shown promising capability for manipulating intraocular MNPs for the purpose of creating a tamponade for RRD.</p> </abstract>

Experimental modeling of convection-diffuse mass transfer in brine of Dombrovskyi quarry (Kalush, Ivano-Frankivsk region)

The article presents the analysis of diffusion-convective mass transfer processes and their parameters, defines hydrogeochemical criteria for evaluation of brine chemical composition formation in Dombrovskyi quarry of Kalush-Golynske deposit. It has been experimentally determined that the temperature gradient (20 °С) significantly affects the rate of mass transfer in the brines. This is probably due to convection-diffuse processes. The dynamics of processes occurring when fresh water enters the brine surface has been experimentally simulated. Analysis of these data from the point of view of formal kinetics for irreversible process allowed estimating the speed of convection-diffusion process. The rate of self-diffusion of water into saturated brine of galite (D=1,21·10-5 cm2/s) and hydrated (in tritium water) ions of Na+Cl- (D=6,62·10-6 cm2/s) were experimentally studied by the isotope method using the tritium label. According to the spatial dynamics of the half (from equilibrium) tritium concentration, the linear rate of self-diffusion of water into brine (6,56 cm/day) and diffusion of hydrated sodium chloride ions into water (1,10 cm/day) are calculated. At the same time, the change rate of position of half (from equilibrium) tritium concentration in the spatial plan is almost the same: (0,22 cm/day) and (0,23 cm/day), respectively. Mathematical models describing the dynamics of these processes have been constructed. The obtained data make it possible to calculate the rates of salts movement from the depth of the Dombrovskyi quarry to its surface. Estimated amount of fresh water (220 thousand tons), capable to indifundate within a year from the surface to a 100-meter depth in the lower layers of Dombrovskyi quarry brines and dissolve the salt-containing rocks in its sides and the bottom.