Experimental Study of Thermal Characteristics of ZrO2/EG nanofluid for Application of Heat Transfer

In thermal management system nanofluids will act as robust elements in future for coolants. Nanofluids have remarkable potential during the heat transfer increase reported by researchers from all over the world. Nanofluids have attracted many researchers and there have been tremendous advances because of the high thermal characteristics and possible applications in certain areas such as the transport sector, aerospace, medical regions and microelectronics. This current study reports on the thermal characteristics of nanofluid based on ZrO2/EG. The nanoparticles characterized by XRD and SEM techniques. Nanofluid was prepared by a two-step method in ethylene glycol (EG) using ultra sonication. The thermal conductivity of ZrO2/EG nanofluid was investigated experimentally at various volume concentrations (0.02-0.1vol. %) and temperature range between 35-55oC. The enhancement in thermal conductivity was observed to be 26.2 % at 0.1vol. % which exhibits superior performance as compared to base fluid (EG). The results of the experiment were compared with the three most often utilised model in the literature. The behavior of ZrO2/water based nanofluid thermal conductivity, viscosity and stability in various concentrations was studied.

Study on Preparation of Superhydrophobic Surface by Selective Laser Melting and Corrosion Resistance

Superhydrophobic surfaces are used in aerospace, medical equipment, transportation, household appliances and other fields due to their special interface characteristics. In this paper, a superhydrophobic surface is prepared by Selective Laser Melting (SLM) 3D-printed technology, comparing the effects of different post-treatment methods and time on corrosion resistance, and revealing the root cause of the transition from hydrophilic to superhydrophobic. The test results show that for samples not treated with fluoro-silane, the microstructure adsorbs the organic matter in the air and reduces the surface energy, which is the root cause of the sample surface changing from hydrophilic to superhydrophobic. In addition, the corrosion resistance of 3D-printed, polished, 3D-printed + modified, and 3D-printed + corroded samples are analyzed. Among them, 3D-printed + modified samples have a longer resistance to corrosion, and after placing in outdoor natural conditions for 60 days, the contact angle of water droplets on the surface is 150.8°, which still has superhydrophobic properties and excellent natural durability.

High Strain Rate Mechanical Properties of SAC-Q Solder for Extreme Temperatures After Exposure to Isothermal Aging Up to 90 Days

In many industries, such as automotive, oil and gas, aerospace, medical technologies, electronic parts can often be exposed to high strain loads during shocks, vibrations and drop-impact conditions. Such electronic parts can often be subjected to extreme low and high temperatures ranging from -65oC to 200oC. Also, these electronic devices can be subjected to strain rates of 1 to 100 per second in the critical environment. Recently, many doped SAC solder alloys are being introduced in the electronic component e.g. SAC-Q, SAC-R, Innolot, etc. SAC-Q is made with addition of Bi in Sn-Ag-Cu are composition. Mechanical characteristic results and data for lead-free solder alloys are extremely important for optimizing electronic package reliability, at high temperature storage and elevated strain rates. Furthermore, the mechanical properties of solder alloys can be changed significantly due to a thermal aging, which is causing modification of microstructure. Data for the SAC-Q solder alloy with a high temp aging and testing at extreme low to high operating temperatures are not available.

Tribology of additive manufacturing: an editorial

Additive manufacturing (AM) enables the rapid fabrication of parts with complex geometries that cannot be easily manufactured with traditional methods. While originally limited to rapid prototyping, recent advances in AM technology also enable direct fabrication of functional end-use parts in, e.g., aerospace, medical devices, and military applications.

Advances in Space Medicine Applied to Pandemics on Earth

Preparation and planning are critical when facing an epidemic or pandemic. Timely solutions must be incorporated in addition to existing guidelines in the case of a fast-spreading epidemic. Advances in space health have been driven by the need to preserve human health in an austere environment, in which medical assistance or resupply from the ground is not possible. This paper speculates on the similarities between human spaceflight and epidemics, extended to pandemics, identifying implementable solutions for immediate use by healthcare personnel and healthcare systems. We believe aerospace medical research can be seen as a resource to improve terrestrial medical care and the management of patients on Earth.

Strengthening of Materials by Equal Channel Angular Pressing Using ANSYS

Equal channel angular pressing (ECAP) is one of the popular severe plastic deformation processes used to produce bulk nano structured materials. It is well known that large deformation results in microstructures with small grains and extensive dislocation cells development, often leading to corresponding increases in strength. In order to design an equal channel angular pressing (ECAP) die that can be used to process a variety of materials, it is crucial to understand the effect of die design and material parameters on the deformation behaviour, strain distribution and load requirement. In this analysis, the effect of internal die angle (Φ) and number of passes (N) on the strain behaviour of engineering materials and alloys, during ECAP was investigated by using three dimensional finite element analyses. The benefits of ECAE come from its ability to impose intense simple shear deformation through innovative die design. Unlike conventional extrusion processes, the cross section of billets extruded via ECAE is not reduced. Entire work will be carried out with the help of SOLID WORKS, ANSYS. These ultra-fine grained materials can be used in the manufacturing of semi-finished products used in the power, aerospace, medical and automotive industries.

Evaluating Post Machining Process of 3D Printing Topology Optimization

There is significant interest today in additive manufacturing which is automatically producing 3D objects by adding layer-upon-layer of material. Additive manufacturing offers a revolutionary way of creating parts despite their geometric complexity compared to conventional manufacturing methods. Today, both the number of additive manufacturing processes and the materials available has developed rapidly which leads to the easy integration of topology optimization with it to improve structural performance in engineering fields such as in an automobile, aerospace, medical and biomechanical industries. The principal aim of this paper is to study the post-machining process of topology optimized parts. Topology optimization is an intelligent approach to get the best reduce weight design and achieve optimal performance at the same time in many fields. Yet unfortunately, it still faces some post-machining issues.

Empirical Study of Solar Absorber Metamaterial Characterization in GHz and THz Regime

Advanced material such as composite material, metamaterial, nanomaterials and smart materials plays a significant role in degree of performance of any system as compared to conventional material and hence, they are commonly used in diverse applications such as aerospace, medical devices, sensor detection, smart solar application etc. Metamaterial is one of such artificial sub-wavelength materials to exhibit electromagnetic and optical properties that surpass or complement those accessible in nature. In this research paper, three structure of metamaterials are simulated for the solar application as an absorber to increase solar efficiency as well as to increase negative refractive index to represent wave propagation in different directions. From this study it can be concluded that all the three materials have reached maximum point of absorption in a narrow bandwidth and it is possible to obtain transverse magnetic wave if the materials are stacked. These materials can be used as frequency detector for THz applications.

Stress Management and Air Traffic Control Trainees: Development and Evaluation of a New Training Course

The primary mission of the Federal Aviation Administration (FAA) is to maintain the safety of the National Airspace System (NAS). As part of this mission, the FAA is tasked with ensuring that future air traffic controllers are adequately trained to perform the high-risk job of directing air traffic. The FAA Academy curriculum for newly hired controllers involves 3-4 months of intensive lessons and performance assessments. It has been suggested that this training program is quite stressful, and successful trainees tend to be those who can better manage stress. To support ATC trainees, researchers at the Civil Aerospace Medical Institute (CAMI) have conducted operational research to develop and evaluate a stress management training to help trainees manage their stress during training at the FAA Academy.

A smart position optimization scheme for badminton doubles based on human–computer interactive training in wireless sensor networks

In the continuous development process, robot technology based on multimedia interactions has been widely used in aerospace, medical, education and service industries. The relationship between robots and humans is getting closer. The improvement of robot intelligence is a process of continuously learning the outside world. Since 1959, multimedia human–computer interaction technology has provided more and more technical support for human research robots. In this paper, we firstly study the characteristics of badminton competition, including the technical characteristics, tactics characteristics, and the collection requirements about on-site training. The technical description of the badminton doubles station is also completed. Furthermore, in terms of the digitalization of the gait-based sensation, the automated acquisition of the gait technology, the simultaneously with the video, and the high-speed imaging system, the system implement information is integrated. After that, badminton multimedia techniques and tactics are designed based on the extensive statistical analysis. The skills and tactics of athletes are expressed in the form of video, graphics and text. Finally, the operators can carry out the technical and tactical analysis processes through good human–computer interactions. This increases the end user’s game information. The related attention and understanding can strengthen the strength and depth of technical and tactical ability analysis. Thus, we propose the station optimization plan for badminton doubles.