Current Issue : April - June Volume : 2019 Issue Number : 2 Articles : 5 Articles
A two-part Notional Synthesis on Nanophotonics Fundamentals is being carried\nout: On the one hand, a rather novel depiction of the Fermionic Quantum\nCausality is being attempted. On the other hand, a Nanophotonic Response\nEncoder is being devised: Illuminated Electrons are the original Protagonists....
We evaluated the biological, mechanical, and surface properties of polymer nanocomposites\nmanufactured via plastics processing, extrusion, and injection moulding. The aim of this study was to\nidentify the interaction of fibroblasts and osteoblasts with materials intended for middle ear implants.\nWe examined if silver nanoparticles (AgNPs) may change the mechanical parameters of the polymer\nnanocomposites. In our study, the biostable polymer of thermoplastic acrylonitrile-butadiene-styrene\n(ABS) copolymer was used. Silver nanoparticles were applied as a modifier. We discuss surface\nparameters of the materials, including wettability and roughness, and evaluated the microstructure.\nThe mechanical parameters, such as the Youngâ??s modulus and tensile strength, were measured.\nCytotoxicity tests were conducted on two cell lines: Hs680.Tr human fibroblasts and Saos-2 human\nosteoblasts. Cell viability, proliferation, and morphology in direct contact with nanocomposites were\ntested. Based on the results, the incorporated modifier was found to affect neither the number of\nosteoblasts nor the fibroblast cells. However, the addition of AgNPs had a relatively small effect\non the cytotoxicity of the materials. A slight increase in the cytotoxicity of the test materials was\nobserved with respect to the control, with the cytotoxicity of the materials tending to decrease\nafter seven days for osteoblast cells, whereas it remained steady for fibroblasts. Based on optical\nmicroscope observation, the shape and morphology of the adhered cells were evaluated. After\nseven days of culture, fibroblasts and osteoblasts were properly shaped and evenly settled on the\nsurface of both the pure polymer and the silver nanoparticle-modified composite. Water droplet tests\ndemonstrated increased hydrophilicity when adding the AgNPs to ABS matrices, whereas roughness\ntests did not show changes in the surface topography of the investigated samples. The 0.5% by weight\nincorporation of AgNPs into ABS matrices did not influence the mechanical properties....
Heat exchangers have its major application in automobile, air condition, refrigerator,\npower plants, and many others. Heat transfer characteristics and\nperformance of Copper spiral heat exchanger are investigated and compared\nwith pure water. Nanofluid can enhance thermos-physical properties. Experiment\nis carried out for water based SiO2 Nanofluid with 15 nm average\nsized nanoparticle at varying air velocity and mass flow rate of fluid to investigate\nits effect on heat transfer coefficient. From the experimental data, a\nclosed form solution for Nusselt number has been calculated using ����...
Implantable electrical interfaces with the nervous system were first enabled by cardiac pacemaker technology over 50 years ago and\nhave since diverged into almost all of the physiological functions controlled by the nervous system. There have been a few major\nclinical and commercial successes, many contentious claims, and some outright failures. These tend to be reviewed within each\nclinical subspecialty, obscuring the many commonalities of neural control, biophysics, interface materials, electronic\ntechnologies, and medical device regulation that they share. This review cites a selection of foundational and recent journal\narticles and reviews for all major applications of neural prosthetic interfaces in clinical use, trials, or development. The hardwon\nknowledge and experience across all of these fields can now be amalgamated and distilled into more systematic processes\nfor development of clinical products instead of the often empirical (trial and error) approaches to date. These include a frank\nassessment of a specific clinical problem, the state of its underlying science, the identification of feasible targets, the availability\nof suitable technologies, and the path to regulatory and reimbursement approval. Increasing commercial interest and investment\nfacilitates this systematic approach, but it also motivates projects and products whose claims are dubious....
This study focuses on the mechanical response of silicon on porous silicon\nbilayer cantilevers ended with a seismic mass. The porous silicon is intended\nto provide an alternative to decrease the cantilever stiffness for low-frequency\nMEMS applications. The first eigenfrequency of the cantilever is obtained\nusing static deflection obtained under classical Euler-Bernoulli assumptions\nand Rayleigh method. In order to estimate the errors due to small-strain approximation\nand Euler-Bernoulli theory, the analytical results were validated\nthrough 3D finite element simulations for different cantilever geometries and\nporosities. Both bulk silicon and silicon on porous silicon bilayer cantilevers\nended with a seismic mass were fabricated and we measured the first eigenfrequency\n(f0) and quality factor (Q) by using a laser Doppler vibrometer. In\nagreement with the theoretical predictions we found that, when compared to\nbulk silicon cantilevers, the first eigenfrequency of a bilayer cantilever containing\n6% porous silicon (at 50% porosity) on 94% bulk silicon is lowered by\n5%,............
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