39results about How to "Achieve anisotropy" patented technology

An azimuth meter using spin-valve giant magneto-resistive elements, which is simple in manufacturing process, can be made compact in size and contribute to power saving, is disclosed. The azimuth meter comprises a quadrilateral plane coil having two pairs of parallel opposed sides and four spin-valve giant magneto-resistive element pairs, each pair of the elements disposed on a plane parallel to the coil. The longitudinal directions of two elements of each pair orthogonally cross each other, and cross only a respective side or only the same side of a pair of the opposed sides of the plane coil at substantially 45 degrees. The pinned layer of one of the two elements is magnetized in its longitudinal direction, and that of the other element is magnetized in the same direction as the pinned layer of that one element. The paired elements are connected to each other at one end. While a voltage for measurement is being applied between the other ends, a midpoint potential is taken out of the ends of the elements connected to each other to determine an azimuth.

The invention discloses an integrated fiber post for dental restoration and a preparation method thereof. The integrated fiber post for dental restoration is characterized by integrating a post and a core and comprising a post and core tail part and a head core part; the conical structure of the post and core tail part is consistent with the conical structure of a dental drilling head; the head core part is in an umbrella cap structure; the lower edge of the umbrella cap structure is fully matched with the residual part of a defected tooth; the outline part of the umbrella cap structure is fully matched with a crown part; and a porcelain crown is directly sleeved on the head core part. The method for forming and machining the integrated fiber post comprises the following steps of: (1) acquiring CT (computed tomography) data of the defected tooth; (2) reconstructing the three-dimensional model of the tooth and a post and core crown through a computer; (3) building a CAD (computer-aided design) model of the integrated post and core; (4) transferring the information of the CAD model of the integrated fiber post and core into a CAM (computer-aided manufacturing) numerical control center; and (5) cutting and machining the integrated fiber post and core by a machining center of a numerical control machine. The fiber post of the invention has improved strength, reduced post and core abhesion in application, and avoidances of breakage of tooth posts and failure of restoration caused by stress concentration.

The invention provides an anisotropic twisted fiber bundle and its preparation method and application. The method comprises the following steps: performing primary processing on the initial single fiber obtained by wet spinning or electrospinning by clockwise twisting method. twisting to obtain primary twisted fiber bundles; using the primary twisted fiber bundles obtained by multiple strands for secondary twisting to obtain anisotropic twisted fiber bundles. The anisotropic twisted fiber bundle provided by the invention can realize the compounding of various materials and the integration of various functions, has structure and performance anisotropy, high strength and flexibility, and the size of the fiber is controllable and can be bent arbitrarily and braiding, which have broad applications in energy storage devices and anisotropic liquid transport.

The invention discloses a double-sided nano-coating particle capable of adjusting the rheology of drilling fluid. The particle uses silicon dioxide micron particles as a matrix, and the outer side is sequentially covered with titanium (Ti)-nickel (Ni)-titanium with nanoscale thickness. (Ti) coating. The double-sided human nano-coating particles are polarized and added to the drilling fluid, and then the magnetic field is applied at different positions or the strength of the magnetic field is changed to use the double-sided human nano-coating particles to adjust the rheology of the drilling fluid. The non-chemical solvent of the present invention can be recovered and recycled, greatly reducing the cost of drilling fluid; the linear structure is different under different magnetic fields, which facilitates the adjustment of rheology, and the movement direction and speed of nano-coating particles are controllable; different positions give different magnetic field strengths, The rheology can be adjusted to realize the anisotropy of drilling fluid rheology, which has significant advantages compared with traditional chemical reagents.

A circulating etching method of a silicon nitride hole with high depth-to-width ratio comprises of the steps of 1 adopting a dry-method plasma process and fluorocarbon-based gas to perform silicon nitride thin film etching so as to form the hole and meanwhile generating a polymer depositing on the bottom and the side wall of the hole; 2 feeding oxidizing gas and diluting gas into an etching cavity. The deposition amount of fluorocarbon on the side wall of the deep hole can be controlled, the polymer depositing on the bottom of the deep hole can be removed so as to ensure continuous etching, and the two steps are repeatedly performed till the etching profile of the hole meets the requirement. When the fluorocarbon-based gas in the step 1 is increased and accordingly the fluorocarbon amount is increased, the hole is slightly oblique. When the oxidizing gas in the step 2 is increased, the hole is upright. Different hole etching profiles can be obtained as required by adjusting parameters to be between the two amounts.

The invention discloses a method for etching a metal molybdenum material. The method comprises the following steps of: forming an etching mask on the metal molybdenum material; and generating high-density and high-energy ions and free radicals by adopting a high-density plasma (such as ICP (Inductively Coupled Plasma), TCP (Transformer Coupled Plasma) and the like) dry etching process to realize high-speed and anisotropic etching of the metal molybdenum material. The etching speed can be up to 2.63 microns per minute, and the vertical degree of an etching result side wall can be up 70 degrees. On the basis of the method disclosed by the invention, a metal molybdenum substrate can be taken as a main body material for preparing an MEMS (Micro Electro Mechanical System) device.

The invention discloses a frequency-tunable terahertz multi-band absorber, which comprises an absorber body fixed on a rotatable platform. Several absorbing units are arranged on the absorbing surface of the absorber body, and each absorbing unit includes a The three-layer structure of metal pattern layer, lossy dielectric layer and bottom total reflection layer closely attached from top to bottom. The metal pattern layer includes four pairs of H-shaped metal pattern symmetrical structures centered on the surface of the absorbing unit. Each pair of H-shaped metal patterns is symmetrical The structures all include two H-shaped metal structures, and four pairs of H-shaped metal pattern symmetrical structures are uniformly arranged in a clockwise direction. Generate responses to problems that limit practical application capabilities.

The invention discloses a static pressure gas bearing comprising a bearing base body and an air-supply hole loop. Air-supply holes on the air-supply hole loop adopt a mode of loop surface throttling; the air-supply hole loop is divided into a plurality of independent regions along the circumferential direction, the diameters of the air-supply holes in all the regions are different; every region has an independent air-supply passage; every air-supply passage is connected with an industrial personal computer via an electric proportional valve and an amplifier; and the industrial personal computer sends a control signal to the amplifier according to a rotor operation condition detected by a displacement transducer to adjust air-supply pressure. The air-supply holes on the air-supply hole loop adopt a reversely tangential air-supply mode or a vertical air-supply mode. The pressure distribution in a flow field is changed because the diameters of the air-supply holes are different, therefore, the rigidity characteristic of the bearing in different directions is changed and the rigidity anisotropy of the bearing is realized. The system stability can be effectively improved due to rigidity anisotropy when the diameters of the air-supply holes in different regions are reasonably matched.

An electroplating copper layer includes bamboo-like copper crystal particles having a highly preferred orientation. The bamboo-like copper crystal particles have a long axis direction and a short axis direction, and the bamboo-like copper crystal particles have a length of 20 nm to 5 μm in the long axis direction and a length of 20 nm to 2 μm in the short axis direction. The bamboo-like copper crystal particles have a uniform particle size, and the electroplating copper layer has a major diffraction peak at a 2θ angle of about 44°.