114results about How to "Reduce loss value" patented technology

The invention discloses a traditional Chinese medicine health consultation text named entity recognition method based on transfer learning, which comprises the following steps: S1, selecting a text named entity recognition annotation data set in other fields, constructing a neural network, and performing pre-training; S2, respectively constructing a one-way recurrent neural network, and performinglanguage model training by utilizing the traditional Chinese medicine health consultation text unlabeled data set to obtain a forward language model and a reverse language model. And S3, fusing the loop network layer output characteristics of the unidirectional language model, and combining the full connection network layer and the conditional random field layer to obtain a final named entity recognition model. And S4, naming the entity by using the traditional Chinese medicine health consultation text to identify the labeled data set, and carrying out fine tuning training. According to the method, named entities in other fields can be migrated to identify labeled text knowledge and unlabeled text knowledge in the field, so that the identification accuracy and recall rate of the named entities of the traditional Chinese medicine health consultation text are effectively improved, and the convergence speed of the model is increased.

The invention discloses a mask plate for evaporation. The mask plate is characterized by including a first region and second regions. Specifically, the first region corresponds to a display area, the second region corresponds to transition areas, and the second regions are arranged on the left side and right side of the first region. The first region is equipped with a plurality of horizontally parallel slits, the second regions are provided with at least one row of holes, and rib support members are disposed between the adjacent holes in each row of holes. The mask plate for evaporation provided by the invention has better tension transition and balance effects, and the risk of edge color mixing occurring during evaporation in the display area can be reduced. In addition, compared with the prior art, the mask plate occupies less space and realizes frame narrowing in space. The design can also reduce the manufacturing difficulty of the mask plate and lower the cost of the mask plate.

The invention discloses a preparation method of a nanometer crystal magnetic powder core with a magnetic conductivity mumof 60. The method comprises the following steps: thermally treating an iron-based amorphous thin ribbon prepared by a rapid cooling method into a nano-crystalline ribbon, wherein the iron-based amorphous thin ribbon has the following components by weight: 3-15% of Ni, 1-10% of Si, 1-4% of B, 1-9% of Al and the balance of Fe; crushing the nano-crystalline ribbon to obtain nano-crystalline metal powders; conducting ball-milling and shaping the nano-crystalline metal powders; screening the nano-crystalline metal powders, and mixing the nano-crystalline metal powders into powder particle consisting of 90%-98% of first powder screened by a -200-mesh sieve and 2%-10% of second powder screened by a (-150)-(+200)-mesh sieve for distribution; mixing the mixed nano-crystalline metal powders with a bonding agent, and pressing to form the magnetic core; and annealing the formed magnetic core, and then, coating the magnetic core with insulating resin. According to the technical scheme, the magnetic powder core has stable magnetic conductivity, a loss value and direct-current bias ability.

The present invention discloses a halogen-free epoxy resin composition having low dielectric loss, comprises: (A) 100 parts by weight of an epoxy resin; (B) 10-30 parts by weight of a DOPO modified curing agent; (C) 1-10 parts by weight of benzoxazine resin; (D) 60-90 parts by weight of an active ester compound; (E) 20-50 parts by weight of a flame retardant; and (F) 0.5-10 parts by weight of a curing accelerator. The halogen-free epoxy resin composition uses active ester as a curing agent of the epoxy resin to ensure that the hardening product has characteristics such as low dielectric constant (Dk), low dielectric loss (Df), high heat resistance, low water absorption, flame retardant and halogen-free. The halogen-free epoxy resin composition of the present invention is used for manufacturing semi-cured prepregs or resin-coated films, and is applied toward manufacturing metal clad laminates and printed circuit boards.

The invention provides solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and a preparation method thereof. The piezoelectric ceramics are represented by chemical composition general formula of (1-x)(0.74Na0.5Bi0.5TiO3-0.26SrTiO3)-xBa(Zr0.05Ti0.95)O3 or (1-y)(0.9Na0.5Bi0.5TiO3-0.1CaTiO3)-yBa(Zr0.05Ti0.95)O3, wherein 0.04<=x<=0.1 and 0.04<=y<=0.1. Solid solution of Ba(Zr0.05Ti0.95)O3 is realized at the morphotropic phase boundary of a 0.74Na0.5Bi0.5TiO3-0.26SrTiO3 and 0.9Na0.5Bi0.5TiO3-0.1CaTiO3 system, and high-density microcrystalline structure ceramics with uniform crystal grain size distribution are obtained by a two-step forming method and a self-bearing pressure sintering process. The piezoelectric property of the material is optimized by the morphotropic phase boundary composition characteristics and the solid solution modification method, and the piezoelectric constant d33 reaches 110-138 PC / N; the electromechanical coupling coefficient of the material is also increased obviously; the preparation process of the material is simple and stable, and the material is an optimal material for manufacturing low-power ultrasonic devices and energy transducers used in fields of gas sensors, industrial nondestructive test, and the like.

The invention discloses a preparation method of an anisotropic FeSiAl magnetic core and a product. The preparation flow comprises the steps of (1) performing smashing on a FeSiAl cast ingot by adopting a sand mill and then performing flattening treatment to obtain flake-shaped FeSiAl magnetic powder; (2) coating the surface of the flake-shaped FeSiAl magnetic powder with an SiO<2> insulating material by adopting a sol-gel process; (3) performing uniform mixing on the coated FeSiAl and a binder to prepare coating paste, and coating a substrate with the paste, and next, putting the product into a magnetic field to be subjected to orientation; (4) performing hot pressing compaction treatment on the oriented coating sheet, and performing curing at a certain temperature; and (5) performing punch forming on the cured coating sheet to obtain the anisotropic FeSiAl magnetic core. The anisotropic FeSiAl magnetic core prepared in the invention has high insulativity as well as high heat resistance; high magnetic conductivity and low loss value still can be maintained at 1MHz, and high direct current biasing resistance characteristic is still kept; and in addition, the preparation process for the anisotropic FeSiAl magnetic core is mild in conditions, convenient and quick to operate and high in efficiency, and batch production can be promoted.

The invention discloses a nano-crystalline magnetic powder core with magnetic conductivity of mu=60. The nano-crystalline magnetic powder core is prepared according to the following steps of: carrying out heat treatment on an iron base non-crystalline thin tape prepared via a rapid cooling method, and the iron base non-crystalline thin tape is converted into a nano-crystalline thin tape; obtaining nano-crystalline metal powders after the nano-crystalline thin tape is smashed; ball-milling and reshaping the nano-crystalline metal powders; screening the nano-crystalline metal powders, and mixing the screened nano-crystalline metal powders into powders distributed in particles, wherein the powders comprise 90-98 percent of first powder passing through a minus 200 mesh and 2-10 percent of second powder passing through a minus 150 - above 200 mesh; mixing the mixed nano-crystalline metal powders with a bonding agent, and shaping the magnetic powder core via compression; and annealing on the shaped magnetic powder core, and coating the magnetic powder core with insulation resin. By the adoption of the technical scheme, the magnetic powder core is provided with stable magnetic conductivity, loss value and direct-current polarization capability.

This invention provides a fluorate clad plastic fiber characterizing in having fluorate clad a fibre core or plastic fiber. This invention also provides the process method for fluorate clad plastic fiber including preparing materials: preparing fibre core or plastic fibre; putting fibre core or plastic fibre into a fluorate over with the concentration of 0.01%-10% to perform fluorate reaction for 2-72h at 10-80 deg.c to finish the fluorate clad plastic fiber.

The invention relates to a production method for a magnetic material, in particular to a low-permeability, low-power consumption Fe-Si-Al soft magnetic material and a production method thereof. The production method for the low-permeability, low-power consumption Fe-Si-Al soft magnetic material includes the following steps: (1) In the process of producing Fe-Si-Al powder, a melt-spinning machine rapid cooling method is adopted to produce a strip, and flat Fe-Si-Al powder is produced by atmosphere-protected mechanical crushing; (2) when the produced Fe-Si-Al powder is roasted until the temperature reaches 80 DEG C to 120 DEG C, phosphoric acid diluent is added for surface treatment, and the Fe-Si-Al powder then continues to be roasted to become dry; (3) the Fe-Si-Al alloy soft magnetic powder is pressed to be shaped; (4) in heat treatment, hydrogen or nitrogen is filled into a heat treatment furnace; (5) epoxy resin paint is applied on the surface of the soft magnetic material. The invention has the advantages that: the oxygen content of the powder is greatly decreased, the grain size of the product is reduced, consequently, the loss of the Fe-Si-Al product is reduced, and the properties of the product are enhanced.

The invention discloses a multi-core optical fiber connector, comprising a multi-core optical fiber capillary sleeved on a multi-core optical fiber, connection optical fibers, a connection optical fiber capillary sleeved on the outside of the connection optical fibers and an optical fiber elastic sleeving, wherein the quantity of the connection optical fibers is identical to that of the cores of the multi-core optical fiber, the distribution of the connection optical fibers is identical to that of the cores of the multi-core optical fiber and the outer diameter is D; the optical cable elastic sleeving sleeves the outside of the multi-core optical fiber capillary and the connection optical fiber capillary; when the multi-core optical fiber capillary is closely abutted against the connection optical fiber capillary, the multi-core optical fiber is abutted against the connection optical fibers; the multi-core optical fiber is in butt joint with the connection optical fibers through rotating the connection optical fibers; and the optical fiber elastic sleeving is fixed with the connection optical fiber capillary through glue and the multi-core optical capillary. Through the technical scheme of the multi-core optical fiber connection structure, two capillaries are abutted against and then realize the butt joint between the multi-core optical fiber and the connection optical fibers through rotating, and the loss value is minimum.

The invention relates to an insert device, in particular to an insert device with an exhausting function, belonging to the technical field of the optical fiber junction. The ferrule device with the exhausting function comprises a connection pipe; two ends of the connection pipe are respectively provided with a first ferrule and a second ferrule; one end of the second ferrule extends into the connection pipe and is fixedly connected with the connection pipe; one end of the first ferrule extends into the connection pipe and can slide in the connection pipe; the connection pipe is internally provided with optical fiber matching fluid corresponding to the end of the second ferrule, the fiber matching fluid surrounds the end of the second ferrule; and the connection pipe is provided with an exhausting hole corresponding to the side wall provided with the optical fiber matching fluid. The invention has the advantages of simple structure, convenient operation, low splice loss as well as high stability and reliability.

The invention provides an energy storage current transformer combination optimizing method based on maximum energy efficiency. The method includes the following steps: A, inputting basic data of a photovoltaic micro-grid; B, calculating the load within all sampling intervals [delta]T and the net power of photovoltaic output according to load data and photovoltaic output data in the step A; setting the required total power PC of an energy storage current transformer according to a net power value P0' obtained in the step B and associated with the charge and discharge process of an energy storage system and also according to the maximum energy storage charge and discharge power PBmax; D, calculating all current transformer combinations that meet requirements according to optional current transformer specifications and the total power of the current transformer determined in the step C; E, adopting a smart algorithm to distribute power to each current transformer combination determined in the step D within each period of time relative to each current transformer in the combination according to the net power value P0' obtained in the step B and associated with the charge and discharge process of the energy storage system and also to the configured the total power PC of the energy storage current transformer; and F, selecting the current transformer combination the loss of which is the minimum within a whole counted period of time in the step E as a final energy storage current transformer combination scheme.

A body structure of an AT power roll-core autotransformer relates to a body of a transformer. Insulation strength, an overload ability, an anti-short circuit ability, a high loss, etc. of a conventional autotransformer body structure cannot meet requirements of an electric railway. An iron core of the body structure of the AT power roll-core autotransformer is a single frame closed roll core structure, vertical columns of the iron core are iron core columns, and horizontal columns of the iron core are iron yokes. A plurality of concentric coils are wound around each iron core column, and upper and lower ends of each coil are both provided with insulation end rings. A lower end of a lower insulation end ring and an upper end of an upper insulation end ring are both provided with iron yoke insulation plates. Pressing devices are disposed on the upper iron yoke insulation plate, and integrally press the coil, the insulation end ring, and the iron core as a whole. The present technical solution uses the body structure of the roll-core autotransformer to enhance the insulation property and heat dispersion property, to improve the overload ability and the anti-short circuit ability of the transformer, to reduce the loss value of the transformer, and to meet the special requirements of the electric railway.