摘要:
The invention relates to the realization of synthesis of organic com¬ pounds or abatement of volatile organic compounds (VOCs) in gas-solid fluid- ised bed photocatalytic reactor with improved illumination efficiency. The photoreactor consists of a two-dimensional fluidized bed catalytic reactor with two walls transparent to ultraviolet radiation, by an illumination system based on an array of LEDs positioned near its external walls, and heated by Joule effect inside the catalytic bed to control the reaction temperature. Through the use of the reactor it is possible to carry out both partial and total oxidation re¬ actions with high activity and selectivity and, in addition, the illuminated cata¬ lyst surface area per unit of irradiated volume reaches values in the order of 106 m"1, significantly higher than the values typical of microreactors and slurry reactors. The photocatalytic system reported in the present invention is shown to have high illumination efficiency due to the use of UV-LEDs, which, ensur¬ ing a direction of light irradiation orthogonal to the emission point, minimize the dispersion of photons.
摘要:
The invention concerns an actuator with bending-vibrating foils, comprising: a transducer (20) of the 'Langevin' type, connected to a foil (1) with a longitudinal principal extension direction, characterised in that: the transducer (20) is such to excite longitudinal modes, i.e. modes in which the direction of the produced motion is equal to that of the applied electrical field; foil (1) is placed in such a way that its longitudinal principal extension direction is substantially perpendicular to the direction of the motion produced by said transducer (20).
摘要:
The present invention relates to microporous manufacts (i.e, manufact presenting high porosity, often referred as aerogels) based on syndiotactic polystyrene and characterized by the presence of cavities with nanometric dimensions characteristic of the δ crystalline form and to processes for their preparation. These manufacts are capable to absorb with a fast kinetics volatile organic compounds from liquid or gaseous phases, also when such components are present at very low concentrations.
摘要:
The present invention relates to microporous manufacts (i.e, manufact presenting high porosity, often referred as aerogels) based on syndiotactic polystyrene and characterized by the presence of cavities with nanometric dimensions characteristic of the δ crystalline form and to processes for their preparation. These manufacts are capable to absorb with a fast kinetics volatile organic compounds from liquid or gaseous phases, also when such components are present at very low concentrations.
摘要:
A real time radiation dosimeter includes a first electrode and a second electrode, such as cathode and anode electrodes. The second electrode is based on carbon nanomaterials, such as carbon nanotubes bucky paper, carbon nanotubes forest and graphene film. The dosimeter is connected to an electrometer, able to apply a bias voltage between the electrodes and to measure the collected charge. The manufactured detectors display an excellent linear response to dose. The dosimeter with nanotubes forest is able to collect charge also to zero voltage, allowing in vivo applications. The use of nanomaterials allows a miniaturized version of dosimeters.
摘要:
The present invention describes a new synthetic strategy that permits to produce 2D 1D, e OD hybrid organic-inorganic nanocrystals of tungsten/molybdenum chalcogenides. The innovative chemical approach is based on the thermal decomposition of a molecular precursor containing both metal and sulphur, in a mixture of long chain amines and/or fatty acids and/or long chain thiols. By the control of reaction conditions is possible to address the synthesis can be driven towards the formation of nanosystems with different morphologies such as sheets, particles, rods, tubes.
摘要:
The invention concerns a process for the continuous treatment of an emulsion and/or a micro-emulsion assisted by an 'expanded liquid' for the production of micro- and/or nano-particles or micro- and/or nano- spheres containing one or more active ingredients. In particular, a liquid solvent expanded by compressed or supercritical CO2 is contacted with an O/W emulsion, or alternatively a W/O emulsion or multiple emulsions, formed by an external phase that is itself a liquid expanded by compressed CO2. The expanded liquid forms a solution with the dispersed phase of the emulsion and extracts it inducing the formation of the desired particles of the dissolved compounds. The process is carried out in a counter-current packed column wherein the expanded emulsion is fed from the top, while the expanded liquid is fed from the bottom. Thanks to the presence of the expanded liquid, any deposition of the solid particles produced on the packing elements is avoided, thus preventing any column blockage. A suspension of micro-structured particles of the desired product can be collected continuously at the bottom of the column.
摘要:
Provided herein are a control method and a control device for controlling a supply unit, which enable supply of the maximum power that can be delivered by a power source, said method being characterized by the presence of an absolute maximum on1 the curve of the power as a function of the voltage at the connection terminals; the supply system set betwee'n the power source and the load is preferably a DC/DC switching converter. The control circuit identifies the optimal operating point, using the relation existing between the harmonic components of the power and the harmonic components of the voltage at the terminals of the source. Starting from any value of the voltage at the connection terminals, the control circuit increments the value of the voltage if, for a given value of the frequency, the power and the vo'ltage at the connection terminals are in phase, whilst it decrements the value of the voltage if the power and the voltage are in phase opposition. The control circuit can be obtained employing discrete analog devices and integrated analog devices of a widely used type.
摘要:
The present invention relates an absorbent product able to lengthen the preservation period of food products, by optimizing at the same time the maintenance of the sensorial parameters, period designated hereinafter as shelf life. The adsorbent product includes cellulose, zeolites and starch and it is used in adsorbent/food product ratio of 0.5 - 5 % in weight.
摘要:
The present invention relates an absorbent product able to lengthen the preservation period of food products, by optimizing at the same time the maintenance of the sensorial parameters, period designated hereinafter as shelf life. The adsorbent product includes cellulose, zeolites and starch and it is used in adsorbent/food product ratio of 0.5 - 5 % in weight.