Nahrávání probehlo na nekolika místech Moravy a byly pri nem zaznamenány predevsím slovenské písne. Prepisy textu ve druhém svazku jsou pripojeny proto, ze texty mohou být pro velkou cást uzivatelu ...nesrozumitelné. K údaji o vyuzívání celostopého záznamu pouze v profesionálních studiích muzeme dodat, ze i na brnenském akademickém pracovisti se v terénu porizovaly od roku 1964 výhradne celostopé záznamy lidových písní hudby na profesionálním magnetofonu firmy Kudelski Nagra III B. Ve druhém svazku nejsou prepsány nekteré komentáre k písním, i kdyz se na ne v textu upozornuje.
This paper discusses energy efficient ADC design with low voltage operation. In SAR ADCs, the energy consumption stays constant in the S&H circuit and increases in the comparator with supply voltage, ...V DD . However, the energy consumed by the logic gates can be reduced using low V DD . Thus, the optimum V DD which minimizes the total energy consumption in SAR ADCs can be found. In flash ADCs, the ENOB is mainly determined by mismatch voltages of the comparators and the energy consumption can be reduced by using lower V DD ; however, it also reduces conversion frequency. Thus, we proposed FoM delay product (FD product) that offers the balance between the energy consumption and conversion speed. The optimum V DD that minimizes FD product can be found. A 0.5 V 5-bit 600 MSps flash ADC has been developed and demonstrated the usefulness of reducing V DD to decrease the energy consumption without serious degradation of the performance.
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•Activated carbons (ACs) were synthesized from DVDs and CDs wastes as precursor.•CNTs coated on the surface of the as-prepared ACs from CDs and DVDs.•The CNTs/CDsAC and CNTs/DVDsAC ...adsorbents were tested for the adsorption of AO7.•Influential parameters, kinetics, equilibrium and reusability were studied.
The purpose of the present work was to prepare activated carbon (AC) from low-cost wastes, such as digital versatile discs (DVDs) and compact discs (CDs), coated with carbon nanotubes (CNTs) for adsorption of Acid Orange 7 (AO7) from dye-containing solutions. The surface morphology of the activated carbons from DVDs (DVDsAC), CDs (CDsAC), CNTs, CNTs/DVDsAC and CNTs/CDsAC was determined by XRD and SEM techniques. SEM micrographs of adsorbents clearly show a heterogeneous porous surface with irregular pores in the structure of the activated carbons. Results showed that CNTs/DVDsAC (30.3mg/g) and CNTs/CDsAC (32.8mg/g), in comparison with DVDsAC (15.1mg/g) and CDsAC (9.9mg/g), were more efficient adsorbents for the adsorption of AO7. The dye adsorption amount (qe) increases with a reduction in the solution pH, adsorbent dosage and an increase in the initial concentration of AO7 for these two more efficient adsorbents. Pseudo-second order model and Langmuir isotherm fitted with the experimental data. The spontaneous and endothermic processes were analyzed by the thermodynamic studies for the adsorption of AO7. The negative values of ΔG, and the positive values of ΔH and ΔS parameters indicate that the adsorption of AO7 onto CNTs/CDsAC and CNTs/DVDsAC was spontaneous and endothermic, respectively.
•We fabricate a humidity sensor with laser-scribed graphene electrode and graphite oxide sensing layer.•The fabrication process is done by a low power (5 mW) DVD drive.•The LSG-GO humidity sensor ...operates in the relative humidity (RH) range of 19 %–97.4 %.•The LSG based humidity sensor demonstrates high sensitivity (4770.14 pF/% RH).•Excellent sensing stability for more than 30 days has been demonstrated.
Monitoring the environmental humidity are of great significance to human comfort and product quality in many fields. However, high performance humidity sensors are difficult to be widely used because of their cost and complex preparation process. It is also highly desirable to develop a facile fabrication method that is capable of producing humidity sensors of customized size, shape, and geometry. Here, using a low power DVD drive, we successfully fabricate a highly sensitivity and low-cost humidity sensor, consisting of laser-scribed graphene (LSG) electrode and graphite oxide (GO) sensing layer. The LSG-GO humidity sensor operates in the relative humidity (RH) range of 19 %–97.4 %, demonstrating high sensitivity (4770.14 pF/% RH), quick response/recovery, and excellent sensing stability. In addition, the possible humidity sensing mechanism is discussed with the help of impedance spectroscopy. These results indicate that the LSG/GO sensor, enabled by the facile fabrication process with low power DVD drives, demonstrates promising potential with broad application prospects.
First proposed in 1970, intracavity absorption spectroscopy (ICAS) has developed into a powerful diagnostics technique. This talk will focus on recent ICAS applications to combustion diagnostics and ...sketch promising future developments.
