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515results about How to "Change thickness" patented technology

Self-assembly method of inorganic nano particle hybridization organic membrane

The invention relates to a self-assembly method of inorganic nano particle hybridization organic membrane. The method comprises steps of: respectively dissolving polycation and polyanion in a dissolvent, preparing to form a membrane casting solution, standing and defoaming; adding inorganic nano particle into a polyanion solution to prepare a polymer nano particle solution; soaking or dynamically filtering polyanion nano particle solution or polycation solution on the surface of a substrate or basal membrane for 10 to 60 minutes to form a thin membrane layer. The substrate or the basal membrane is soaked or dynamically filtered in the polycation solution or polyanion nano particle solution for 10 to 60 minutes; the polyanion nano particle solution reacts with the polycation to form the thin membrane layer; the substrate or the basal membrane is soaked in deionized water, and the membrane surface is rinsed and dried. When the polycation or the polyanion nano particle solution is filtered on the basal membrane, the transmembrane differential pressure thereof is 0.01 to 0.3MPa or minus 0.02 to minus 0.09MPa. The membrane forming method is simple; the thin membrane prepared on the substrate is compact and uniform; the membrane formed on the basal membrane has excellent penetration and vaporization separating property and mechanical strength.
Owner:BEIJING UNIV OF TECH

Anti-impact flexible joint suitable for mechanical arm

ActiveCN106737825AJoints are compactLarge load and self-weight ratioJointsElectricityFlange
The invention discloses an anti-impact flexible joint suitable for a mechanical arm, and belongs to the technical field of robots. An output end cover is fixedly connected with a joint output end shell and a series connection elastic body, and a limiting block is fixedly connected with the series connection elastic body. A first joint position magnetic encoder is fixed to the part between the output end cover and a first magnetic ring fixing frame. A harmonic reducer is fixedly connected with a joint output end shell. A connecting flange plate is fixedly connected with the series connection elastic body. A motor center shaft is fixedly connected with the harmonic reducer and fixedly connected with a brake disc. A motor position magnetic encoder is fixed to the part between a third magnetic ring fixing frame and a power-off brake shell. A first silicon steel sheet is fixedly connected with the joint input end shell. A second silicon steel sheet is fixedly connected with the power-off brake shell. The power-off brake shell is fixedly connected with the joint input shell and a power-off brake end cover. An electromagnet is fixed into the power-off brake shell. A spring ring is arranged between the power-off brake shell and a friction disc, and a friction column is fixedly connected with the brake disc. The anti-impact flexible joint is used for a robot and the mechanical arm.
Owner:HARBIN INST OF TECH

Method capable of adjusting polarization and intensity of terahertz wave rapidly and continuously

The invention relates to a method capable of adjusting the polarization and the intensity of a terahertz wave rapidly and continuously. According to the method, a focusing lens is arranged at the outlet of a femto-second laser; incident laser passes through the focusing lens and a doubling frequency crystal in sequence to generate frequency doubled light; the frequency doubled light and remaining fundamental frequency laser pass through a uniaxial birefringent crystal wafer together; according to the principle that the refractive indexes of the fundamental frequency laser and the frequency doubled light in a uniaxial birefringent crystal are different, the optical path difference, namely the time delay, between the fundamental frequency laser and the frequency doubled light can be changed by adjusting the thickness of the uniaxial birefringent crystal wafer and the spatial included angle between a glass piece and an incident light beam, so that the relative phase between the fundamental frequency laser and the frequency doubled light is changed; and therefore, the polarization and the intensity of the finally generated terahertz wave are adjusted. Finally, the generated terahertz wave enters a terahertz wave detection system after being filtered by a high-resistance silicon wafer. By the method, the polarization and the intensity of the terahertz wave can be adjusted rapidly and continuously; and the operation is simple, rapid and effective.
Owner:UNIV OF SHANGHAI FOR SCI & TECH

Visible light anti-reflection and ultraviolet radiation cut-off bifunctional coated glass and preparation method thereof

The invention discloses a coated glass with the double functions of visible light reducing reflection and ultraviolet radiation cutting-off and the preparation method thereof. A film layer structure of the coated glass is glass uropatagia/ titanium oxide- cerium oxide film/silicon dioxide layer with a plurality of holes, or silicon dioxide layer with a plurality of holes/titanium oxide- cerium oxide film/glass uropatagia/titanium oxide- cerium oxide film/silicon dioxide layer with a plurality of holes. The transmittivity of the visible light is 92 to 98 percent, the ultraviolet radiation cutting-off is larger than or equal to 96 percent. The thickness of the titanium oxide- cerium oxide film layer is 10 to 500nm, the components have the mass ratio that the titanium oxide is 10 to 90 percent, and the cerium oxide is 10 to 90 percent; the thickness of the silicon dioxide layer with a plurality of holes is 20 to 200nm, and the volume of the holes is 10 to 80 percent. The coated glass adopts the preparation method of a single-side spraying process or a double-side dipping and pulling method. Feed liquid for preparing the titanium oxide and the cerium oxide film layer comprises organotitanium and dissolubility cerous salt; the feed liquid for preparing the silicon dioxide layer with a plurality of holes comprises silicon ester, water, and ethanol, and ammonia is used as activator, wherein, the quality of silicon is 1 to 5 percent. The coated glass is performed with the heat treatment under the temperature of 400 to 550 Deg C. The invention can be used as the glass of an autocar, a train, a steamship, buildings and a spotlight.
Owner:WUHAN UNIV OF TECH

Method for composite preparation of high-conductivity and high electromagnetic shielding flexible composite materials through adoption of graphene sponge and polydimethylsiloxane

The present invention belongs to a method for composite preparation of high-conductivity and high electromagnetic shielding flexible composite materials through adoption of graphene sponge and polydimethylsiloxane, belonging to the technical field of high-conductivity flexible composite materials. The objective of the invention is to solve the problems that current graphene sponge products are limited in size by a device and bad in flexibility. The method comprises: 1, preparing oxidized grapheme sponge; 2, performing reduction of the oxidized grapheme sponge through adoption of hydrazine hydrate vapor; 3; performing compression; 4, performing heat treatment; 5, pouring in PDMS solution; and 6, performing vacuum solidification to namely obtain PDMS / grapheme sponge composite materials. The PDMS / grapheme sponge composite materials obtained in the invention have good flexibility and a good electromagnetic shielding performance which can reach 59dB (2mm), the electrical conductivity of the PDMS / grapheme sponge composite materials is 1.03S / cm, and the PDMS / grapheme sponge composite materials have the utilization potentiality in the electromagnetic shielding field; and moreover, the preparation method can be widely applied in the industrial production.
Owner:HARBIN INST OF TECH
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