Strongly nonlinear phononic crystals were assembled from stainless steel spheres. Single solitary waves and splitting of an initial pulse into a train of solitary waves were investigated in different viscous media usi...
Strongly nonlinear phononic crystals were assembled from stainless steel spheres. Single solitary waves and splitting of an initial pulse into a train of solitary waves were investigated in different viscous media using motor oil and non‐aqueous glycerol to introduce a controlled viscous dissipation. Experimental results indicate that the presence of a viscous fluid dramatically altered the splitting of the initial pulse into a train of solitary waves. Numerical simulations qualitatively describe the observed phenomena only when a dissipative term based on the relative velocity between particles is introduced.
We develop a time resolved fluorescence microscopy system to image the dynamics of optoinjection produced by the delivery of a highly focused pulsed Nd:YAG (λ=532nm, 6ns) laser microbeam to the cell membrane of PtK2 ...
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Electron correlation effects on the electronic structure of Gd5Si2Ge2 have been studied using the tight binding linear muffin-tin orbital method within the framework of the local spin density approximation with the Co...
Electron correlation effects on the electronic structure of Gd5Si2Ge2 have been studied using the tight binding linear muffin-tin orbital method within the framework of the local spin density approximation with the Coulomb correlation parameter approach. The magnetostructural transition temperature (TM) and the magnetocaloric effect (isothermal magnetic entropy change, ΔSM) have been calculated using this method by applying the scalar relativistic band theory and the nonlocal exchange correlation parametrization of the exchange correlation potential together with a magnetothermodynamic model. Both TM and ΔSM are in good agreement with experimental values.
Rice husk can be an interesting source of raw material for obtaining silica, due to its composition, availability and cost. The extraction process of silica from rice husk can be divided in two parts. First some compo...
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Rice husk can be an interesting source of raw material for obtaining silica, due to its composition, availability and cost. The extraction process of silica from rice husk can be divided in two parts. First some components of rice husk are removed by acid leaching, using HCl, H2SO4, or a mixture of them, followed by calcination for burning out carbon compounds. The residue obtained after calcination is composed of about 95% amorphous silica. In this work, silica was produced from rice husk following the steps previously described, using leaching solutions of 10% HCl, 10% H 2SO4 and a mixture of 10% HCl and 10% H2SO 4. Calcination of leached materials was carried out at 600 or 700°C for 3 h. The silica powder obtained presented a mean particle size of 18 μm, around 98% amorphous SiO2 with a specific surface area of about 300 m2/g.
Electroosmotic pumping has been extensively used in biomedical lab-on-a-chip devices and micropumps for critical applications such as microelectronic cooling. In many applications, a high flow rate is a key requiremen...
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Time resolved imaging and fluorescent assays were used to examine the biological response of confluent cell cultures to pulsed laser microbeam cell lysis using cavitation bubbles generated by Nd:YAG nanosecond laser p...
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One dimensional “sonic vacuum”‐type phononic crystals were assembled from chains of polytetrafluoroethylene (PTFE) beads and Parylene coated spheres with different diameters. It was demonstrated for the first time ...
One dimensional “sonic vacuum”‐type phononic crystals were assembled from chains of polytetrafluoroethylene (PTFE) beads and Parylene coated spheres with different diameters. It was demonstrated for the first time that these polymer‐based granular system, with exceptionally low elastic modulus of particles, support the propagation of strongly nonlinear solitary waves with a very low speed. They can be described using classical nonlinear Hertz law despite the viscoelastic nature of the polymers and the high strain rate deformation of the contact area. Trains of strongly nonlinear solitary waves excited by an impact were investigated experimentally and were found to be in reasonable agreement with numerical calculations. Tunability of the signal shape and velocity was achieved through a non‐contact magnetically induced precompression of the chains. This applied prestress allowed an increase of up to two times the solitary waves speed and significant delayed the signal splitting. Anomalous reflection at the interface of two “sonic vacua”‐type systems was reported.
Diamond ultramicroelectrode arrays (D-UMEAs) have been fabricated and evaluated experimentally for chemical sensing. D-UMEAs were found to demonstrate higher current density per unit active area than planar diamond ma...
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Diamond ultramicroelectrode arrays (D-UMEAs) have been fabricated and evaluated experimentally for chemical sensing. D-UMEAs were found to demonstrate higher current density per unit active area than planar diamond macroelectrode and glassy carbon electrode. D-UMEAs could address new operating envelopes in electrochemical detection, and provide stable sensor electrodes for bio and extreme environments.
Tetrahedrally bonded amorphous carbon (ta-C) thin films were prepared by mass selected ion beam deposition (MSIBD) using 100 eV carbon ions at room temperature. Gadolinium, a magnetic rare earth element, was implanted...
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To determine whether HIFU treatment can elicit a systemic, anti‐tumor immune response in vivo, MC‐38 solid tumors grown subcutaneously at the right hindlimbs of C57BL/6 mice were treated in an experimental HIFU syst...
To determine whether HIFU treatment can elicit a systemic, anti‐tumor immune response in vivo, MC‐38 solid tumors grown subcutaneously at the right hindlimbs of C57BL/6 mice were treated in an experimental HIFU system. Three different treatment strategies that produce thermal, mechanical, or thermal combined with mechanical damage to the tumor tissue were evaluated. To detect anti‐tumor immune response, a tumor challenge was performed on the left hindlimbs of the mice one day following the HIFU treatment, and subsequently, cytotoxic T lymphocyte (CTL) response was evaluated on day 14. All three HIFU treatment strategies were found to cause significant regression of the primary tumor, with the best suppressive effect produced by the thermal HIFU. In contrast, the most significant regression of the challenged tumor with concomitantly elevated CTL response were detected in mice treated by the mechanical HIFU, followed by the thermal combined with mechanical HIFU, but not in mice treated by the thermal HIFU alone. These findings suggest that alternative treatment strategies that promote mechanical lysis of the tumor cells (in contrast to purely thermal ablation) may enhance HIFU‐induced anti‐tumor immune response.
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