63results about How to "Increase hole size" patented technology

Methods are provided for production of pre-collapsed capacitive micro-machined ultrasonic transducers (cMUTs). Methods disclosed generally include the steps of obtaining a nearly completed traditional cMUT structure prior to etching and sealing the membrane, defining holes through the membrane of the cMUT structure for each electrode ring fixed relative to the top face of the membrane, applying a bias voltage across the membrane and substrate of the cMUT structure so as to collapse the areas of the membrane proximate to the holes to or toward the substrate, fixing and sealing the collapsed areas of the membrane to the substrate by applying an encasing layer, and discontinuing or reducing the bias voltage. CMUT assemblies are provided, including packaged assemblies, integrated assemblies with an integrated circuit / chip (e.g., a beam-steering chip) and a cMUT / lens assembly. Advantageous cMUT-based applications utilizing the disclosed pre-collapsed cMUTs are also provided, e.g., ultrasound transducer-based applications, catheter-based applications, needle-based applications and flowmeter applications.

Methods are provided for production of pre-collapsed capacitive micro-machined ultrasonic transducers (cMUTs). Methods disclosed generally include the steps of obtaining a nearly completed traditional cMUT structure prior to etching and sealing the membrane, defining holes through the membrane of the cMUT structure for each electrode ring fixed relative to the top face of the membrane, applying a bias voltage across the membrane and substrate of the cMUT structure so as to collapse the areas of the membrane proximate to the holes to or toward the substrate, fixing and sealing the collapsed areas of the membrane to the substrate by applying an encasing layer, and discontinuing or reducing the bias voltage. CMUT assemblies are provided, including packaged assemblies, integrated assemblies with an integrated circuit / chip (e.g., a beam-steering chip) and a cMUT / lens assembly. Advantageous cMUT-based applications utilizing the disclosed pre-collapsed cMUTs are also provided, e.g., ultrasound transducer-based applications, catheter-based applications, needle-based applications and flowmeter applications.

The invention relates to an SCM-5 molecular sieve and a preparation method thereof, for mainly solving the problems of porous materials of novel structures which are not related to in the prior art. By adopting the technical scheme that the SCM-5 molecular sieve is prepared from the following chemical components in a mole ratio: xO2 and nY2O3, wherein X is silicon or germanium, Y is at least one of the elements such as aluminum, boron, gallium and iron, n is greater than or equal to 0.0 and less than or equal to 0.40, the interplanar spacing of the SCM-5 molecular sieve has maximum values of X-ray diffraction peaks when d is equal to 11.20+ / -1.0., 7.35+ / -0.20., 5.50+ / -0.15., 3.60+ / -0.10. and 3.39+ / -0.04., the technical problem is relatively well solved, and the prepared SCM-5 molecular sieve has a relatively good application prospect in catalytic cracking of heavy oil and isomerization of organic molecules.

The invention discloses a modified carbon quantum dot loaded hollow tubular carbon nitride photocatalyst and a preparation method thereof. The photocatalyst takes hollow tubular carbon nitride as a carrier and is loaded with modified carbon quantum dots; urea and melamine with a mole ratio of 1-5:1 are used to prepare the hollow tubular carbon nitride through hydrothermal and calcination. The preparation method comprises the following steps of: mixing hollow tubular carbon nitride, water and modified carbon quantum dot solution, and drying to obtain the photocatalyst. The photocatalyst has the advantages of large specific surface area, large number of pores, multiple active sites, high speed of separation and migration of photo-generated carriers, strong light absorption capacity, high photocatalytic activity, high stability, high photocatalytic efficiency and the like; the preparation method of the photocatalyst has the advantages of convenience in synthesis, simplicity in operation,no secondary pollution to the environment and the like. The photocatalyst can be widely used for treating organic pollutants in the environment and killing harmful microorganisms in the environment,and has good application value and application prospect.

The invention discloses a combined optical system for a sun sensor, comprising photomask and microlens, where the photomask is equipped with pore, and the microlens is arranged in back of the photomask in the direction of incident light and opposite to the pore. And the invention discloses a method for implementing the combined optical system. And the invention can provide smaller diffraction facula by bigger pore and is beneficial to preventing the pore on the photomask from being stopped or polluted.

The invention provides a double-peak nano-porous amorphous alloy and a preparation method thereof. The amorphous material has a double-peak nano-porous structure. The elementary composition of the amorphous material is Y<alpha>Ti<beta>Co<gamma>Al<eta>, wherein the atomic percentages of the elements are as follows: alpha greater than or equal to 3.31% and less than or equal to 5.58%, beta greater than or equal to 50.35% and less than or equal to 52.67%, gamma greater than or equal to 19.79% and less than or equal to 20.46%, and eta greater than or equal to 23.56% and less than or equal to 24.28%; and alpha plus beta plus gamma plus eta is 100. According to the preparation method, a Y<28>Ti<28>Co<20>Al<24> two-phase amorphous alloy serves as a precursor; a porous amorphous alloy framework isobtained through the free dealloying method; and the double-peak nano-porous amorphous alloy with a multistage porous structure is prepared through secondary dealloying. The defects that the technology is complex, the overall technological cycle is long, equipment is complex, the manufacturing cost of the equipment is high, the yield is low, the porous structure of the product is single, the poresize is big, the porosity is low and the specific surface area is small in the current porous amorphous alloy preparation process are overcome.

The invention provides a preparation method of a porous ionic type electrically-driven polymer intelligent material. When an ionic polymer-metal compound intelligent material is prepared, a Nafion solution and high-boiling-point additives are mixed, the mixture is pre-frozen in liquid nitrogen after vacuum casting and is then subjected to freeze drying, and finally the ionic polymer-metal compound intelligent material is prepared. When an ionic polymer gel intelligent material is prepared, deionized water, gel monomers, a cross-linking agent and an initiator are evenly mixed to obtain a feed solution; the feed solution is subjected to freeze drying after being pre-frozen in liquid nitrogen, and then immersed in the deionized water to swell at indoor temperature, and then the porous ionic polymer gel intelligent material is prepared. Under the condition that no additive is added, the porous ionic polymer-metal compound intelligent material formed through the freeze-drying process has the advantages of being high in deformation performance, high in response speed, weak in relaxation phenomenon and the like.

To provide a method for producing a ceramic porous material which has a high strength, though it has a high porosity, and which is excellent in permeability without dust generation. In a ceramic porous material having a three-dimensional mesh-like skeleton structure with a large number of substantially spherical adjacent cells communicating with each other via communication holes, the crystal particle size at the rim of each communication hole in the skeleton structure is provided substantially equal to the crystal particle size in the other parts.