Hydrogen Gas Response of Zn1 – xAgxOy and Cu1 – xZnxOy Nanostructured Films

Detection of hydrogen gas in industry, biomedical systems and combustion systems is important for safety reasons. Silver doping in zinc oxide and zinc doping in copper oxide were investigated to obtain improved hydrogen sensing performances for sensors. Samples were grown by chemical method and studied by X-ray diffraction, SEM and sensorial techniques. For selectivity study samples were exposed to hydrogen, methane and ethanol gases. Were found growth and annealing regimes which allow us fabrication of faster and more selective gas sensors based on Zn1-xAgxOy nanostructured films and nanocrystallite Cu1-xZnxOy films with respect to 100 ppm H2

Hydrogen Gas Response of Zn1 – xAgxOy and Cu1 – xZnxOy Nanostructured Films

Detection of hydrogen gas in industry, biomedical systems and combustion systems is important for safety reasons. Silver doping in zinc oxide and zinc doping in copper oxide were investigated to obtain improved hydrogen sensing performances for sensors. Samples were grown by chemical method and studied by X-ray diffraction, SEM and sensorial techniques. For selectivity study samples were exposed to hydrogen, methane and ethanol gases. Were found growth and annealing regimes which allow us fabrication of faster and more selective gas sensors based on Zn1-xAgxOy nanostructured films and nanocrystallite Cu1-xZnxOy films with respect to 100 ppm H2

Ethanol Sensing Performances of Zinc-doped Copper Oxide Nano-crystallite Layers

The synthesis via chemical solutions (aqueous) (SCS) wet route is a low-temperature and cost-effective growth technique of high crystalline quality oxide semiconductors films. Here we report on morphology, chemical composition, structure and ethanol sensing performances of a device prototype based on zincdoped copper oxide nanocrystallite layer. By thermal annealing in electrical furnace for 30 min at temperatures higher than 550 ˚C, as-deposited zinc doped Cu2O samples are converted to tenorite, ZnxCu1-xOy, (x=1.3wt%) that demonstrate higher ethanol response than sensor structures based on samples treated at 450 ˚C. In case of the specimens after post-growth treatment at 650 ˚C was found an ethanol gas response of about 79 % and 91 % to concentrations of 100 ppm and 500 ppm, respectively, at operating temperature of 400 ˚C in air

Using of ISM radio bands for wireless charging of medical implants

Universitatea de Stat de Medicină şi Farmacie „Nicolae Testemiţanu“, Universitatea Tehnică a Moldovei, Spitalul Clinic Central, 9 th International Conference on Microelectronics and Computer Science, Chisinau, Republic of Moldova, October 19-21, 2017In this paper, research progress on wireless powering of implantable devices is discussed and summarized. An efficient method of powering of medical implants is a key component for receive progress in dramatic size reduction without traditional implant's limitation of a short battery life. Appeared in recent years publications reports possible ways of using of decimeter size radio waves (midfield powering) as a very efficient method versus near-field inductively coupling power transfer. But proposed frequencies in GHz range are unpractical due to existing regulations in national and international Radio frequency spectrum regulations, making impossible or very hard following certifications. This article review possible using of GSM or ISM band frequency as a basic frequency for powering of medical implants. Review of possible application in development of commercial available modules for wireless powering was done

The influence of dependences of psychophysiological characteristics of drivers

The article analyzes the "man-machine-environment" system in relation to the psychophysiological characteristics of the driver - "human operator". The methods of diagnosing the psychophysiological characteristics of drivers were analyzed. The dependencies between the parameters of psychophysiological characteristics were established: complex visual-motor reaction and emotional stability (Pearson correlation coefficient r = -0.7), as well as the correlation between emotional stability and the level of perception of speed and distance (r = 0.5). The psychophysiological characteristics at different stages of the driving experience were revealed and practical recommendations were formulated for their development

Copper And Magnesium - Doped Zinc Oxide Nanorods For Device Applications

Layered Superconductors, Volume I, describes the chemistry and physics of all layered superconductors. Although widespread interest in the subject did not really arise until the discovery of high-temperature superconductivity in the cuprates, it has a much longer history, and is still evolving rapidly. This book describes the chemical syntheses, crystal structures, calculations and measurements of the Fermi surfaces, and measurements of the normal state physical properties and of the upper and lower critical fields of all classes of layered superconductors. At present, the large classes of layered superconductors are the graphite intercalation compounds, the transition metal dichalcogenides, the intercalated transition metal dichalcogenides, the organic layered superconductors,various artificial superconducting superlattices, the cuprates, binary and ternary intermetallics with the AlB2 structure, ternary and quaternary intermetallics of the ThCr2Si2 structure, the borocarbides, the iron pnictides, the iron oxypnictides, and the iron chalcogenides. Each of the stoichiometric compounds Sr2RuO4, MgB2, La3Ni2B2N3, and Ag5Pb2O6 are layered superconductors, as are intercalated ß-ZrNCl and ß-HfNCl. Many of these materials exhibit electronic instabilities such as charge-density waves, spin-density waves, magnetism, and pseudogaps , which may have closely related origins, and which compete with the superconductivity. Some of these materials are extremely anisotropic, while others are nearly isotropic in their normal and superconducting behaviours. To characterize the superconductivity, three phenomenological models are presented: the anisotropic London model, the anisotropic Ginzburg-Landau model, and the Lawrence-Doniach model. These models are used to calculate the upper and lower critical fields of layered superconductors. Experimental verification of these and selected microscopic models is provided

Detectors based on Pd-doped and PdO-functionalized ZnO nanostructures

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Synthesis and characterization of Cu-doped ZnO one-dimensional structures for miniaturized sensor applications with faster response

Detection of chemicals and biological species is an important issue to human health and safety. In this paper, we report the hydrothermal synthesis at 95 °C of Cu-doped ZnO low-dimensional rods for room-temperature (RT) sensing applications and enhanced sensor performances. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman and photoluminescence are used to characterize the material properties. To demonstrate the suitability of the Cu-doped ZnO rods for gas sensor applications and for comparison with pure ZnO, we fabricated a double rod device using Focused Ion Beam. The responses of pure-ZnO and Cu-doped ZnO rods studied in exactly the same condition are reported. We found that Cu-ZnO sensors have enhanced RT sensitivity, faster response time, and good selectivity. Miniaturized Cu-ZnO rod-based sensors can serve as a good candidate for effective H2 detectors with low power consumption

Methods for assessing the state of microhemocirculation of biotissue by speckle-structure of multiple scattered radiation

The characteristics of microcirculation of blood in human tissues were investigated by recording and analyzing a dynamic speckle pattern. Methodical approaches are proposed for evaluating the obtained data in order to verify speckle measurements using the widely used Doppler flowmetry technique