1,720,971 research outputs found
Corrosion resistance in FSW and in MIG welding techniques of AA6XXX
No full textA comparison of the corrosion resistance of AA6060T5 and AA6082T6 jointed surfaces via
Friction StirWelding (FSW) and Metal Inert Gas (MIG), respectively, is reported. The test was
conducted putting the welded and polished samples in an acid salt solution. The corrosion
resistance was detected via morphological analysis of the surface. The attack was localized
(pitting), an index referred to the pit density was used for the comparison. The result indicated
that the joint welded via Friction Stir is more resistant than that welded via Metal
Inert Gas technique
metodo per la realizzazione di un elemento decorativo applicabile su superfici e relativo elemento decorativo
No full textIl presente trovato si riferisce ad un metodo decorativo di tipo temporaneo, quale ad esempio un tatuaggio, una decalcomania, o simili, applicabile su superfici quali ad esempio sulla pelle, nel caso di un tatuaggio, o su una superficie di un oggetto. In particolare l'elemento decorativo temporaneo è realizzato con materiali di pregio metallici, preferibilmente metalli nobili, o preziosi, o loro leghe, come ad esempio, ma non esclusivamente, oro, platino, palladio, argento, leghe oro-rame, oro-argento, oro-platino, argento-palladio o simili, oppure materiali non metallici come diamond-like carbon
APPARECCHIATURA PER L'EROGAZIONE DI GELATO E/O SORBETTO E RELATIVO PROCEDIMENTO
No full textDispositivo per la vendita al dettagli di gelato sfuso
METHOD TO MAKE A DECORATIVE ELEMENT WHICH CAN BE APPLIED ON SURFACES AND CORRESPONDING DECORATIVE ELEMENT
No full textMethod to make a decorative element which can be applied on surfaces, comprising a step (22, 26) of making a decorative layer (12) made of high quality materials, metal or non-metal, such as precious materials or precious or noble metals and their alloys on a support layer (11) in order to define a desired design or graphic motif, wherein at least a sub-step (22) is provided of depositing the high quality material by means of a physical vapor deposition (PVD) technique chosen from a group comprising; heat evaporation, electronic beam evaporation, or magnetron sputtering
A novel MEMS device for the multidirectional mechanical stimulation of single cells: Preliminary results
No full textIn recent years, understanding cell mechanics has gained increasing importance, with significant implications for human health. Currently, different technologies have been developed to perform the mechanical stimulation of living cells. However, they often show some limitations. Here we present the development and characterization of a novel microelectromechanical system(MEMS), designed to perform a multidirectional mechanical stimulation of single living cells: in this way, in vitro cell behavior is closely simulated. The proposed device employs a newcompliant spring linkage tomove a twelve-slice sectioned plate that works as a seating platform for the cell under study. The whole platform is moved bymeans of four series of bimorph thermal actuators, which allow displacements in 12 directions in the x–y plane. Results showtheworkability of the device under certain conditions, with important implications for a better understanding of cell mechanics and related disease
Influence of different fixation reagents on NIH 3T3 fibroblasts morphology: An AFM study
No full textThe Atomic force microscope (AFM) has recently become an attractive tool for biological analysis, especially for the characterization of both morphological and mechanical properties. In this study, we investigated the influence of different fixation reagents on NIH 3T3 fibroblast cells morphology. Three protocols were selected: paraformaldehyde, methanol and acetone. Height, perimeter, area, volume and roughness of cells were measured using an AFM. As expected, different fixation protocols produce different morphological changes in cells. However, to preserve fibroblastsí
morphology, the methods applying aldehyde fixations performed much better than those using either methanol or acetone. Based on quantitative assessments, fibroblasts fixed with paraformaldehyde showed the closest volume, area and perimeter values to living cells. Roughness data and a Western blot test confirmed that methanol fixation produces larger cell membrane damage, when compared to the other two fixatives
A completely transparent MEMS for mechanical properties evaluation of a single living cell
No full textRaman spectroscopy characterization of a thermal bimorph actuator used in a bio-MEMS device
No full textDevising a MEMS (Micro Electro Mechanical
System) sensor is a very challenging task. When movement
is required, a transducer has to be integrated, capable to
convert electrical into mechanical energy. Different types
of actuators can be selected, using electrostatic forces,
magnetic fields or thermal expansion, and reliability of
actuators has proven to be a critical element in MEMS
devices. In this paper we have demonstrated that the
Raman spectroscopy technique (using the Raman peaks
shift) is a suitable tool to assess the temperature of a
thermal actuator in a MEMS device. The technique used is
a spectrometric characterization, benefitting from the
Raman peaks shift caused by an increase in temperature.
This method shows that it is possible to map areas with a
resolution of a few microns and a temperature accuracy of
around 0.01 %/full scale. This technique provides good
resolution and accuracy and allows several analyses: from
simple thermal mapping to determination of the system’s
thermal physical parameters and constant thermal resistance variation at a micrometric scale
Thermal analysis by Raman spectroscopy of a MEMS - cell stretcher
No full textIn this paper we have demonstrated that Raman spectroscopy technique (using Raman peaks shift) is a suitable tool to assess the temperature of a thermal actuator in a MEMS device. The technique used is a spectrometric characterization that takes advantage of the Raman peaks shift caused by the increase in temperature. The method shows that it is possible to map areas with a resolution of a few microns and a temperature accuracy of the order of 0.01%/full scale. This technique lets good resolution and accuracy and allows several analyses: from simple thermal mapping to the system thermal physical parameters determination and the constant thermal resistance variation at micrometric scale
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