33results about How to "With filtering effect" patented technology

The invention concerns an HF-surgery device for cutting and / or coagulating biological tissue and a method for same, which in operation monitors the patient skin contact of a connected neutral electrode having at least two separate contact surfaces. The HF-surgery device includes at least one parallel resonant circuit arranged in a patient circuit, at least one measurement energy source arranged in a measurement circuit galvanically separated from the patient circuit for producing a measurement voltage / current acting between the contact surfaces of the neutral electrode, and at least one measuring and computing unit which in operation determines by means of the measurement voltage / current a tissue impedance which is representative of the patient skin contact and which acts between the contact surfaces. An HF-current flows in the patient circuit which is closed in the cutting or coagulation operation and the measurement voltage which is independent of the HF-current can be produced in the measurement circuit. To provide an improved HF-surgery device it is provided according to the invention that the frequency of the measurement voltage source is substantially equal to a resonance frequency of the parallel resonant circuit.

The invention discloses a multiplexed volume holographic grating. The multiplexed volume holographic grating respectively records red, green and blue three holograms on the same dielectric layer by exposing for three times; volume holographic gratings formed by exposure of different wavelengths are the same in inclination angle and are different in period; by controlling exposure time, refractive index modulation depths corresponding to red, green and blue light after exposure accords with the relation that delta n red light is greater than delta n green light, and delta n green light is greater than delta n blue light, and peak diffraction efficiencies corresponding to the red, green and blue light after exposure are similar. The multiplexed volume holographic grating can effectively balance irradiating energy of red, green and blue light waves and avoid color offset.

The invention discloses a high-efficiency low-resistance air filter material prepared form special-shaped melt-blown fiber and a preparation method of the high-efficiency low-resistance air filter material. The high-efficiency low-resistance air filter material is characterized in that a coarse filtration part, a supporting part and a fine filtration part are sequentially arranged from top to bottom to form a filter material adopting a sandwich structure; needling is performed under the conditions that the needling depth ranges from 5 mm to 7 mm and the needling density ranges from 390 needles per cm<2> to 480 needles per cm<2>, and all parts of the filter material are connected to form the high-efficiency low-resistance air filter material; the coarse filtration part and the fine filtration part are made from chemical fiber and combed into net-shaped structure, and the supporting part is made from the special-shaped melt-blown fiber. The high-efficiency low-resistance air filter material has high filter efficiency, the filter resistance is lower, the manufacturing cost is low, and the process is simple and environment-friendly; the special-shaped melt-blown fiber is used for preparing the filter material for the first time, and a great breakthrough is made in the field of filter materials.

The invention relates to blind ditch production equipment and technology. The blind ditch production equipment comprises a heat sealing machine, an edge cutting machine, a film laminating machine, anda heat recessing machine which are sequentially arranged, wherein the heat sealing machine is used for combining a plastic mesh with geotechnical cloth together to form a composite layer; the edge cutting machine is used for cutting the composite layer; the film laminating machine is used for applying the composite layer onto the surface of a bland ditch; the heat recessing machine is used for forming slots in two ends of the bland ditch, and comprises an operation platform, a blind ditch mounting support, a recessing device, and a back-and-forth movement driving mechanism of the recessing device, wherein the recessing device comprises a moving platform and two heating sheave wheels which are symmetrically arranged at the left end and the right end of the moving platform; and electric heating devices are respectively arranged in the heating sheave wheels. Compared with the prior art, the blind ditch production equipment disclosed by the invention has the advantages that the compositelayer is firmly bonded to the surface of the blind ditch, so that the phenomenon that the composite layer falls off is avoided; and the integral structural strength of the blind ditch is enhanced, sothat the blind ditch cannot be damaged under higher pressure.

The invention relates to the technical field of waste gas treatment, and particularly relates to a desulfuration and impurity removal device and process of tunnel kiln exhaust gas. The process comprises the following steps that: A. part of exhaust gas generated in a high temperature baking area is introduced pinto a drying buffer area, the exhaust gas passes through a brick mesh of the drying buffer area and is then discharged from an exhaust gas collection channel; B. another part of exhaust gas generated in the high temperature baking area enters a side air duct through an air duct port, a ventilating gate is opened, cold air outside a tunnel kiln enters the side air duct through a ventilating gate port and is mixed with the exhaust gas in the side air duct, and the mixed exhaust gas enters the high temperature baking area again through the air duct port; C. the ventilating gate is closed, the exhaust gas enters the side air duct through the air duct port, and when the mixed exhaust gas reaches the side air duct of a drying area, the mixed exhaust gas is pumped from the air duct port to the drying area, and the mixed exhaust gas passes the brick mesh of the drying area; and D. the exhaust gas is pumped by a exhaust fan and discharged from the exhaust gas collection channel. The desulfuration and impurity removal device and process of tunnel kiln exhaust gas provided by the invention is good in a dedusting effect and high in desulfuration efficiency, and the sulfur content of the exhaust gas is reduced by 80%-90%.

The invention discloses an echo amplifying circuit of a low-noise MEMS piezoelectric hydrophone. The echo amplifying circuit mainly includes a non-inverting amplifying circuit and a voltage following circuit. The circuit is powered by a precise voltage source, and the follower circuit provides a suitable static potential for the non-inverting amplifying circuit through resistor division. By selecting an operational amplifier with low equivalent input noise voltage and low equivalent input noise current and conducting external resistance Reasonable selection enables the echo amplifier circuit to have a certain filtering effect while reducing the equivalent input noise of the circuit and further improving the signal-to-noise ratio of the signal. The circuit is convenient to adjust the static operating point of the amplifying circuit, the single power supply simplifies the circuit, the circuit has good stability, uses few components, and is low in cost.

The invention discloses an LED outputting narrow-band notch filtering light, and a preparation method thereof. According to the invention, a multi-layer waveguide structural layer is composited on the light-emitting surface of an LED chip and comprises a medium depletion layer, a composite grating layer and a medium protective layer; the composite grating layer is a metal / medium grating film layer which is formed by metal strips and medium strips at intervals; the medium depletion layer is positioned below the composite grating layer and is in direct contact with the light-emitting surface of the LED chip; the medium protective layer is above the composite grating layer and is in direct contact with the ambient environment or transparency electrode; and the thickness of each layer of the multi-layer waveguide structure layer, the grating duty cycle and the period parameter are designed to meet the condition of the resonance of the light waveguide mold transmission. According to the invention, a sub-wavelength metal / medium composite grating structure is directly integrated on the surface of the LED chip, and the LED per se has filtering effect; and compared with a traditional passive filter, the LED is a highly integrated active filtering light-emitting device.

The invention discloses a light-condensing and heat-collecting multistage flash evaporation process device based on feedback control. How to overcome the characteristic that a solar heat source is instable is not considered in the prior art. The light-condensing and heat-collecting multistage flash evaporation process device comprises a solar heat-collecting system, a heat transfer system, a seawater desalting system, a feedback control system and a heat exchanger; the heat transfer system constructs a closed heat transfer working medium circulating loop; the closed heat transfer working medium circulating loop allows a heat conducting working medium to repeatedly circulate; and a seawater desalting loop formed by the seawater desalting system is in an open structure and allows the seawater desalting system to continuously generate fresh water. Meanwhile, a feedback control loop is applied to the light-condensing and heat-collecting multistage flash evaporation process device disclosed by the invention; a flow temperature meter is used for measuring fluid and temperature signals in several pipelines and feeding back the signals to an industrial controller; and according to the feedback signals, the industrial controller generates a control command for adjusting the rotating speeds of each motor and each centrifugal pump. According to the light-condensing and heat-collecting multistage flash evaporation process device disclosed by the invention, adverse influence generated by solar fluctuation is overcome; and meanwhile, the utilization efficiency of heat energy is increased and energy saving and environment friendliness are realized.