65 results about "Microwave radiometry" patented technology

A method of minimizing thermal trauma during tissue ablation includes the steps of placing an ablation catheter at an ablation site on a first organ in a patient's body, providing energy to the ablation catheter to heat first organ tissue at the ablation site, providing microwave radiometry apparatus including a probe containing a microwave antenna and a radiometer responsive to the antenna output for producing a temperature signal corresponding to the thermal radiation picked up by the antenna and positioning the probe in a body passage of a second organ in the patient's body having a wall portion adjacent to the ablation site so that the microwave antenna is located at a measurement site opposite the ablation site. Using the radiometry apparatus, the temperature at depth in the second organ tissue at the measurement site is measured to provide a corresponding temperature signal, and the ablation catheter is controlled in response to the temperature signal to maintain the temperature of the second organ tissue below a predetermined value that does not result in thermal trauma to the second organ tissue. Apparatus for carrying out the method is also disclosed.

The invention relates to a nano carbon doped electrocatalyst for a fuel cell, and application of the nano carbon doped electrocatalyst. The electrocatalyst is prepared by adopting the steps of: complexing a nitrogen-containing and/or boron-containing organic precursor and a transition metal salt to form a composite; adding nano carbon as a carrier, and heating and reacting a mixture by adopting a microwave radiation method; and after the reaction is complete, filtering and drying, placing a product obtained after the reaction in an inert atmosphere and/or reducing atmosphere, and treating at a high temperature of 500-1500 DEG C to obtain the nano carbon doped electrocatalyst. The nano carbon doped electrocatalyst is very low in cost, high in activity and stability and excellent in anti-poisoning capacity.

A system and method for remotely measuring the temperature of an object using microwave radiometry that may be used in hostile environments. A single pole-single throw reflective PIN diode switch is operable in a PASS mode and a BLOCK mode. In the PASS mode, the switch passes the power received from the object to a low-noise block converter (“LNB”) for amplification. In the BLOCK mode, the switch blocks the object power and reflects the load noise power of an ambient temperature load to the LNB. A detector diode detects the amplified power output during both the BLOCK and PASS mode and the AC signal from the detector is converted to an output signal proportional to the difference in the noise powers detected in the PASS and BLOCK modes. A servo loop uses the output signal to generate a feedback signal to a noise injection diode that causes the diode to inject sufficient power into the LNB to automatically maintain a balance between noise power measured in the PASS mode and the combined noise powers measured in the BLOCK mode. The output signal is then used to compute the temperature of the object.

The invention relates to a synthesis method of an alkaline earth metal vanadate micro/nano material by utilizing microwave radiation. According to the method, with an alkaline earth metal salt and ammonium metavanadate as the raw materials and distilled water as a solvent, the alkaline earth metal vanadate micro/nano material is prepared in a microwave radiation heating mode in the presence of a structure directing agent. The synthesis method is characterized in that: the microwave heating efficiency is high, and the phase and morphology of the product are effectively controlled through the adjustment and control of the raw material properties or the structure directing agent, ultimately the high-efficiency functional nano material is acquired; and the synthesis method has the significant advantages of no temperature and concentration hysteresis, high operability, mild reaction conditions, simple process, and the like and the microstructure of the product is controllable. The invention also provides valuable experience for the application of the metal vanadate micro/nano material in the fields of energy storage and conversion, sewage treatment, photocatalysis, biomedicine, etc.

The invention provides a method for synthesizing metal molybdate micron/nano materials by adopting a microwave radiation method. The method is characterized by taking alkaline-earth metal salts or rare-earth metal salts, ammonium molybdate and a surfactant ethylene diamine tetraacetic acid as raw materials and distilled water as a solvent, and adopting the surfactant-assisted microwave radiation method to prepare the molybdate micron/nano materials. The method has the following advantages: by adopting the surfactant-assisted microwave radiation method to prepare the metal molybdate micron/nano materials, the prepared materials have uniform sizes and regular topography, and effective control on the microstructures of the products can be realized by controlling the conditions of the microwave radiation process; the method has the advantages of mild reaction conditions, simple equipment, high process controllability, high yield and the like; and the metal molybdate micron/nano materials can be widely applied to the fields such as energy storage and conversion, gas sensing, photoluminescence, laser illuminators and the like.

The invention relates to a method for preparing yellow-green-fluorescent graphene quantum dots. The method comprises the following steps of: adding concentrated NHO3 and concentrated H2SO4 to an oxidized graphene solution, uniformly mixing, placing a mixture in a microwave oven to react, cooling down to be at the room temperature, carrying out an ultrasonic operation, regulating a pH value to be 8, and carrying out millipore filtration and dialysis to obtain yellow-green-fluorescent graphene quantum dots with the quantum yield reaching up to 11.7%; and further reducing the yellow-green graphene quantum dots through NaBH4 to obtain blue graphene quantum dots, wherein the quantum yield reaches up to 22.9%. According to the method for preparing the bicolor graphene quantum dots through the microwave radiation manner, the yellow-green or blue graphene quantum dots are represented through an AFM (Atomic Force Microscope) and a high-resolution TEM (Transmission Electron Micorscope) so that the prepared graphene quantum dots have excellent dispersibility, the granular sizes are mainly in the range of 2-7nm, the average grain diameter is 4.5nm, and the average height of the quantum dots is 1.2nm. The manufactured graphene quantum dots have excellent dispersibility underwater, can stably exist for a long term, have excellent fluorescence property and can be applied to biological mark and sensor analysis.

Systems and methods are disclosed for highly accurate calibration of microwave radiometry devices by defeating reflections from a cryogenic blackbody calibration target and, further, defeating a standing wave established between reflecting features at the device and at the blackbody calibration target. The preferred disclosed system includes adaptations for effective Brewster angle presentation of radiation emanating from the target to the radiometry device. Other embodiments are taught for substantially eliminating or randomizing the standing wave in both wavelength dependent and independent applications.

Disclosed is a method for synthesizing modified manganese dioxide nanometer material compound acrylic ester type oil-absorptive resin. The method includes modifying analytically pure manganese dioxide by vinyltriethoxysilane, modifying prepared manganese dioxde nanowires by cetyl trimethyl ammonium bromide so that manganese nanometer materials are of hydrophobicity; utilizing butyl methacrylate and butyl acrylate as oil-absorptive resin as main monomer, utilizing poval, N, N'-methylene bisacrylamide, benzoyl peroxide and ethyl acetate as dispersing agent, crosslinking agent, trigger and pore-forming agent of a polymerizing reaction system, and synthesizing modified manganese dioxide nanometer material compound acrylic ester type oil-absorptive resin by means of microwave radiation. The oil absorption ratio of the acrylic ester type oil-absorptive resin synthetized by the method to halohydrocarbon such as carbon tetrachloride is 20-40% higher than that of conventional acrylic ester type high-oil-absorption resin, and thermal stability is improved largely.

A method for preparing fluorescent nanopowder opf yttrium europium vanadate includes mixing sodium metavanadic acid with solids of yttrium nirate and europium nitrate in distilled water, agitating the material in distilled water to be solution; regulating pH value to 4-11, reacting on the solution for 5-10 min, under microwave radiation of 260W-560 W and obtaining the desired product through centrifugal separation, distilled water washing and drying.

The invention discloses a preparation method of hydroxyapatite microspheres. Methods for synthesizing spherical hydroxyapatite at present mainly comprise a secondary granulation molding method and a direct synthesis method, and the secondary granulation molding method has a high cost because of high apparatus requirements, strict reaction conditions and large energy consumption. Particles prepared through the direct synthesis method have a wide particle size distribution and have an irregular morphology. The method disclosed in the invention comprises the following steps: placing spherical calcium carbonate in an aqueous solution of phosphate as a precursor template, carrying out a hydrothermal method and a microwave radiation method, and carrying out an anion exchange reaction to prepare the hydroxyapatite microspheres. The method disclosed in the invention has the characteristics of rapid reaction, simple operation process, no need of template removal and the like. The obtained hydroxyapatite microspheres can be widely used in the biomedical field as an ideal carrier material for drug sustained release.

The invention discloses a preparation method of carbon monoxide absorbent which is mainly applicable to the resource recycling of carbon monoxide in yellow phosphorus tail gas and belongs to the field of flue gas purification.The preparation method includes: using NaY type molecular sieve as the carrier to prepare CuCl2 solution, adding the molecular sieve into the CuCl2 solution, adding an appropriate amount cerium nitrate, using a microwave radiation method to perform ion exchanging on the molecular sieve, drying, and calcining the molecular sieve after the exchanging to obtain the absorbent.The absorbent needs to be reductively activated by oxygen before being used, and the used molecular sieve can be desorbed through vacuumizing or heating.The prepared absorbent is short in modification time, high in ion exchanging degree, even in active substance dispersion, high in molecular sieve catalytic activity and promising in industrial application prospect.

The invention relates to chitosan oligosaccharide Schiff base phosphonate, which has the structural formula shown in the specification, and in the formula, n is 2-20. The preparation method comprises the following steps of: carrying out chemical modification on chitosan oligosaccharide with salicylaldehyde and substituted salicylaldehyde by adopting a microwave radiation method to obtain a chitosan oligosaccharide Schiff base (S-COS), and then carrying out addition reaction on the S-COS and diethyl phosphite to obtain the chitosan oligosaccharide Schiff base phosphonate. The chitosan oligosaccharide Schiff base phosphonate has better activity for resisting tobacco mosaic virus.

The invention relates to a method for synthesizing a vanadic acid zinc overlength nanowire material by microwave radiation. By using zinc nitrate and ammonium metavanadate as main raw materials and distilled water as solvent, a vanadic acid zinc one-dimensional nanometer material is prepared by the microwave radiation. The method is characterized in that the structure of a target product can be controlled by the method on a microcosmic scale, and the method is suitable for developing a minisize functional one-dimensional material excellent in performance. The method has the advantages that the method is high in operability of experimental conditions, low in energy consumption, and high in productivity and the like, the method for synthesizing the material can further provide basic researches of luminescent materials, electrochemistry, permanent magnet materials and biological medical materials with necessary theoretical basis and practical experience.

The invention discloses a method for preparing a biological water reducing agent via a microwave radiation method, and belongs to the technical field of concrete additives. The biological water reducing agent is prepared by leading hydrophilic groups with strong polarity onto starch molecules by utilizing special thermal effects of microwave radiation. The biological water reducing agent comprises the following components by weight percent: 20% to 75% of starch, 0% to 25% of esterifying agent, 3% to 30% of sulfonating agent, 0% to 45% of reaction medium, 0% to 5% of catalyst, 30% to 70% of distilled water and 1% to 5% of 30% caustic soda liquid. The method disclosed by the invention has the advantages that compared with the prior art, the method has the characteristics of being simple in operation process, high in reaction efficiency, low in energy consumption, environmentally friendly, pollution-free and the like. The biological water reducing agent prepared by using the method is stable in performance, high in water reducing rate, low in cost and strong in cement adaptability, and has the good compatibility and the good synergistic effect with a naphthalene water reducing agent or a polycarboxylate water reducing agent.

The disclosure relates to methods and devices for monitoring e.g., fatigue levels by measuring a subject's body core temperature. In one embodiment, microwave radiometry is used to measure such core temperature.

An interference classifier is disclosed for determining the type of interference present in a signal. The interference classifier 601 comprises a buffer 602 operable to receive and store data comprising samples of a signal; a scale factor calculator 603 operable to use the signal samples to calculate a scale factor in dependence upon the levels of the signal samples; a normaliser 604 operable to calculate normalised signal samples by using the scale factor to normalise the signal samples; a nonlinear transformer 605 operable to perform a nonlinear transform on the normalised signal samples to calculate transformed signal samples; an averaging circuit 606 operable to calculate an average of the transformed signal samples; and a comparator 607 operable to compare the calculated average of the transformed signal samples to a predetermined threshold level in order to determine the type of interference present in the received signal. The interference classifier 601 disclosed herein performs an advantageous type of nonlinear transform that provides an improvement in detection probability over known kurtosis-based interference classifiers. Applications of the interference classifier 601 include automotive radar systems, radio astronomy, microwave radiometry, weather forecasting and cognitive radio networks.

The invention discloses a preparation method of an MOF catalyst for photo-catalytic purifying of air. The preparation method comprises the following steps of (a) preparing an MOF-5 carrier through a microwave radiation method; (b) dissolving AgNO3 in ethylene glycol, adding nanometer TiO2 powder into the solution for mixing, stirring and mixing uniformly, so as to obtain a precursor solution; (c) uniformly dispersing the MOF-5 carrier prepared in step (a) into DMF, then adding into the precursor solution prepared in step (b), reacting for 1 to 3h, then carrying out ultraviolet irradiation for 10 to 20min, using the DMF for washing obtained precipitate for multiple times, carrying out centrifugal separation, drying the precipitate in a freezer dryer for 1 to 3 days, finally grinding the dried precipitate, and sieving through a 20 to 40-mesh sieve to obtain the required catalyst. The service life of the catalyst prepared by adopting the method can be up to three years.

The invention discloses a method for removing a polycyclic aromatic hydrocarbon, namely pyrene, in simulated wastewater by virtue of adsorption by using coal-based active carbon which is prepared by taking Xinjiang anthracite as a carbon source and by use of a microwave radiation method. The coal-based active carbon is prepared through the steps of mixing activators with the anthracite, putting the mixture in a microwave reaction device, and finally carrying out one-step carbonization and activation in the presence of the activators KOH, ZNCl2 and H3PO4 under the conditions of an agent-to-material ratio of 1: 1 to 1:5, microwave time of 4-20 minutes, microwave power of 100W to 900W and N2 protection. The coal-based active carbons prepared in different embodiments have an average pore size of 28.22-42.54 angstroms, and also have relatively large specific surface area; the specific surface area is 623.84-1770.49 m<2>/g, and the total pore volume is 0.32-0.99 cm<2>/g. The adsorbing capacity of the coal-based active carbon to the pyrene reaches 89.43mg/g, and the removal rate of the pyrene is 99.37%. For removing the pyrene in wastewater, the coal-based active carbon prepared by use of a microwave method is characterized in that energy saving and high efficiency are shown in the preparation process of the active carbon, the active carbon has the advantages of large adsorption capacity, high adsorption rate, remarkable treatment efficiency and the like, and thus has excellent economic benefit and environmental benefit.

The invention water solubility shell oligosaccharide preparing method. It includes the following steps: using shell oligosaccharide as raw material, rinsing, drying, soaking in feed liquid, processing microwave radiation degrading to form the mixture of dissoluble shell oligosaccharide and part of un-degraded shell oligosaccharide; then filtering to gain shell oligosaccharide residue and solution, sending the solution into anhydrous alcohol to process alcohol bleeding, drying to gain the finished product. Compared with existing preparing method, it has the advantages of advanced technology, simple working procedure, high purity, reducing production cost, environment protection, saving energy, industrialization scale production etc.

The invention provides a method for preparing bismuth oxide doped with a metal ion, which is characterized in that the easy-made bismuth compound and an alcohol compound are acted as the reaction raw material, the transitional metal ion Fe 3+ and Ni 2+ are doped, and then the metal ion doped bismuth oxide is prepared by means of an ultrasonic radiation. The preparation method for preparing bismuth oxide doped with the metal ion has the advantages of no environmental pollution, simple process, low production cost, and relatively narrow particle size distribution, strong oxidation capability, high catalysis activity, nontoxicity, good chemical stability of the produced product, which is applicable to the fields such as wastewater treatment, sewage treatment, waste gas disposal, and energy material, and also promoted to be used in the disposal of waste gas exhausted from the domestic rubbish burning industry and steel enterprises.

The invention discloses a method for preparing biomass powdered activated carbon from lichi seeds and relates to the technical field of activated carbon. According to the method, the lichi seeds are aired and ground into granules, the granules, calcium hydroxide and sodium hydroxide are mixed in the mass ratio being 1:(1-5):(0.05-0.20), water is added, the mixture is soaked, puffed and dried, the dried mixture is heated with a microwave radiation method and then cooled, hydrochloric acid is added, and the mixture is stirred, soaked, distilled to be neutral with distilled water, dried, treated with steam water and finally dried. Compared with the prior art, the prepared activated carbon has rich micropores, pores in concentrated distribution, continuous hole channels and a large specific surface area, is a good adsorption material and an anti-bacterial agent and can effectively remove blocking ions in the channels after being modified with acid, and the volume of cavities and the hole channels is 50% of the total volume of the biomass powdered activated carbon.

The invention discloses a high-specific surface silkworm excrement-porous carbon-MOFs composite material prepared through an impregnation method and a preparation method and application thereof. The preparation method comprises the steps that firstly, silkworm excrement and water are subjected to mixing swelling and then freeze-dried; secondly, the freeze-dried silkworm excrement is subjected to a carbonization chambering reaction in protection gas, and then cleaning, centrifuging and drying are conducted to obtain a silkworm excrement-based porous carbon material; thirdly, a metal salt solution and the material are stirred, mixed, centrifuged and dried, and high-dispersion metal oxides are formed on the surface of the silkworm excrement-based porous carbon material by introducing oxygen under the plasma modification conditions; fourthly, MOFs grow on the surface of the silkworm excrement-based carbon material by taking the high-dispersion metal oxides as precursors through a microwave radiation method; lastly, suction filtration and drying are conducted, and the high-specific surface silkworm excrement-porous carbon-MOFs composite material prepared through the impregnation method is obtained. The material can be applied to sustained or controlled release of pesticides. The composite carbon material obtained through the method has the high specific surface and carboxy groups and can achieve the high adsorption capacity and the good sustained or controlled release effect on the pesticides.

The invention discloses a preparation method of a catalyst for preparing cyclohexanol from cyclohexene and application of the catalyst in preparing cyclohexanol from cyclohexene. The catalyst adopts amicrowave radiation method for loading an active ingredient tungsten and a silanization reagent on a molecular sieve ZSM-5. The catalyst provided by the invention has relatively strong water-oil amphipathy, so that reaction activity is improved. Meanwhile, the catalyst prepared by the microwave radiation method has higher mechanical strength and a longer service life. Selectivity of the catalystprovided by the invention for preparing cyclohexanol from cyclohexene hydration reaches 99%. The catalyst is prepared by an advanced process, and has great industrial application prospect.