53results about How to "Strong restrictive ability" patented technology

The invention discloses a thin-film lithium niobate single-polarization waveguide and a preparation method thereof, which belong to the field of integrated photonics. The thin-film lithium niobate single-polarization waveguide comprises an upper cladding, a lithium niobate thin film waveguide core layer, a lower cladding and a substrate layer from top to bottom, wherein the lithium niobate thin film waveguide core layer comprises a ridge-shaped waveguide and groove-shaped regions located on the two sides of the ridge-shaped waveguide; the width and the etching depth of the ridge-shaped waveguide are smaller than a cut-off value existing in a TM0 mode, and the TM0 mode in the ridge-shaped waveguide and a TE1 mode in the groove-shaped regions are subjected to cross coupling; and the width value of the groove-shaped regions enables the TE1 mode coupled from the TM0 mode in the ridge-shaped waveguide to the groove-shaped regions on the two sides to be coherent with the TM0 mode leaked to the groove-shaped regions. By optimizing geometric parameters of the micro-nano optical waveguide structure, the waveguide structure only supporting TE0 mode stable transmission is obtained. The thin-film lithium niobate single-polarization waveguide is high in light field limiting capacity, the integration degree of the device is improved, and the technological process is simplified.

The invention discloses a method for screening bio-control bacteria of cucumber fusarium wilt, and provides a method for identifying the bio-control nature of to-be-identified bacteria to pathogenic bacteria of the cucumber fusarium wilt including experimental treatment. The experiment treatment sequentially includes following steps of 1), accelerating sprouting of sterilized cucumber seeds to obtain the sprouting seeds; 2), subjecting the sprouting seeds to soaking in suspension liquid of the to-be-identified bacteria prior to cultivating the sprouting seeds till radicle length reaches by 1.5-2.0cm; 3), inoculating cucumber seedlings to suspension liquid of the pathogenic bateria of the cucumber fusarium wilt; 4), transferring the cucumber seedlings to MS solid media to cultivate, and identifying the bio-control nature of the to-be-identified bacteria to the patheogenic bacteria of the cucumber fusarium wilt by surveying disease indexes and/or observing disease phenotypes. The method is applicable to screening the bio-control bacteria of the cucumber fusarium wilt. In the method, the cucumber seedlings used as samples can truly reflect disease prevention effect of the bio-control bacteria, and can screen bacterial strains of various bio-control mechanisms.

The invention provides a silicon-based optical Peres gate reversible logic device based on a micro-ring resonator, and belongs to the technical field of optical logic calculation. The device comprisesfive micro-ring resonators and two Y-branch couplers. According to the invention, the optical Peres gate reversible logic device has three to-be-calculated electric pulse sequence inputs, and the output is calculated light pulse sequence; and the manufacturing process of the device is completely compatible with a COMS process, so that the device is small in size, high in speed, low in power consumption and convenient to integrate, and is expected to play an important role in a photon computer.

The invention discloses a method for manufacturing a quantum dot field effect transistor array. The method comprises the following steps of: selecting an epitaxial wafer, coating photoresist on the epitaxial wafer to corrode the epitaxial wafer to form a table board to form a source-drain channel, wherein sources in a same row are connected together during photoetching; evaporating an electrode on a source and a drain to carry out electrode annealing to form ohmic contact of the source, the drain and a conductive channel; evaporating a transparent electrode to photoetch grids between the source and the drain, wherein the grids in the same row are connected together; evaporating an insulating layer on the surface and exposing source-grid electrode welding tables at each row and at two ends of the epitaxial wafer; photoetching and corroding the insulating layer to enable the drain to be exposed, evaporating alloy, and utilizing a stripping technique to enable the drains at a same column to be connected together; and coating the photoresist to realize protection and surface passivation. Through the method for manufacturing the quantum dot field effect transistor array, disclosed by the invention, a problem that the common CCD (charge coupled device) can not effectively perform low-light detection is solved, the power consumption is low, and a purpose of high-gain low-light detection of image capture is realized under a weak light condition.

The invention provides a reversible optical exclusive or logic device based on microring resonators. The reversible optical exclusive or logic device consists of two microring resonators and a Y-shaped branch coupler, two electrical pulse sequence inputs to be calculated and optical pulse train outputs subjected to exclusive or calculation; the inputs and the outputs are in one-to-one correspondence. A manufacturing process of the reversible optical exclusive or logic device provided by the invention is completely compatible with a COMS (Complementary Metal Oxide Semiconductor) process, so that the device is small in size, quick in speed, low in power consumption and convenient for integration, and is expected to play an important role in photon computers.

The invention discloses an information prompting method and device, and relates to the field of information technology. Through the information prompting method and device, sending of information content can be separated from information prompting on the aspect of time, so that the information content is prompted and presented for an opposite side at a most appropriate moment. According to the embodiment of the invention, the information prompting method comprises the following steps: receiving information edited by a user, wherein the information comprises characters, pictures or voice; receiving an information prompting trigger logic selected by the user, wherein the information prompting trigger logic is used for prompting receiving equipment through an information prompting way when a set information prompting condition is satisfied; and transmitting the information and the information prompting trigger logic to the receiving equipment in order that information prompting is triggered to prompt the receiving equipment of the reception of the information when the information prompting trigger logic is met. The scheme provided in the embodiment of the invention is suitable to be adopted in information prompting.

The invention relates to a transformer internal fault on-line monitoring method which is characterized by specifically comprising the following steps: (1) establishing a T-shaped equivalent circuit model according to a transformer circuit structure; (2) constructing a target function J shown in the following formula (I), wherein the target function is used for solving a high-voltage side resistorR1, a high-voltage side leakage reactance X1, a low-voltage side resistor reduction value R2', a low-voltage side leakage reactance reduction value X2', an excitation resistor Rm and an excitation reactance Xm; (3) under the normal condition of the transformer, selecting an optimization algorithm to carry out optimization calculation by taking the formula J as the target function to obtain optimalsolutions and corresponding fitness of R1, X1, R2', X2', Rm and Xm, (4) carrying out online monitoring on the transformer, and (5) comparing and judging a fault type. According to the transformer internal fault on-line monitoring method, the equivalent circuit parameters of the transformer, such as winding resistance, leakage reactance and equivalent excitation branch impedance, are judged through on-line calculation and identification, the windings and iron cores can be monitored in real time, the classification monitoring of different internal faults is achieved, and the method has higher sensitivity for slight iron core faults or slight turn-to-turn short circuits.

The invention discloses an indent-size subway tunnel/train compartment dual-long and narrow space fire experiment platform. The fire experiment platform comprises a tunnel unit, a train unit, a railway unit, a fire source simulation unit, a longitudinal ventilation unit and a fire parameter measurement unit, wherein the tunnel unit adopts an arc-shaped ceiling structure and is located on the ground; the train unit is placed in the tunnel unit and controlled by the railway unit on the ground to move; the fire source simulation unit is placed in the train unit and used for generating fire plumesrequired by an experiment; the longitudinal ventilation unit is placed at one end of the tunnel unit and used for providing longitudinal ventilation; the fire parameter measurement unit is used for collecting various parameters in the experiment. By means of the fire experiment platform, the defects that a full-size experiment is high in cost, and numerical simulation is not precise enough are overcome, research on a series of basic theories of the entrainment characteristics of the fire plumes, smoke transportation behaviors and the like generated when a train fire occurs in a tunnel can bedeveloped, and the platform has a practical guiding significance for fire detection, smoke control and personnel evacuating in a fire scene.

The invention discloses a high-gloss colorful pearlescent PET master batch. The high-gloss colorful pearlescent PET master batch comprises, by weight, 75-85 parts of PET, 8-15 parts of PMMA, 3-8 partsof a toner, 0.2-3 parts of a scraping resistant agent and 0.1-0.5 part of a lubricant. A preparation method of the high-gloss colorful pearlescent PET master batch comprises the following steps: rawmaterials are weighed according to above weight part proportions, are added into a high-speed mixer, and are uniformly stirred, the obtained mixture is added into a homodromous double screw extruder,and is blended, extruded and drawn, the obtained mixture is pelletized to obtain a preliminary master batch, and the preliminary master batch is dried to obtain the finished master batch. Compared with the prior art, the preparation method prepares the high-gloss colorful pearlescent PET master batch with a face pearl-like gloss without adding pearl powder; and he pearlescent master batch has theadvantages of good dispersibility and tinting strength, dust-free and environmentally-friendly processing and using process, simple manufacturing technology, low production cost and wide uses.

The invention discloses a method for manufacturing a laser chip for water vapor detection. The method comprises the following steps of: 1, epitaxially growing an InP buffer layer, a lower waveguide layer, a multi-quantum well structure, an upper waveguide layer and a p-n inversion layer on an n-type InP substrate sequentially; 2, making a recoupling grating on the p-n inversion layer and the upper waveguide layer by using a holographic exposure method; 3, secondarily epitaxially growing a first p-InP cover layer, an etching stop layer, a second p-InP cover layer and a p-InGaAs contact layer on the recoupling grating; 4, corroding to form a ridge-type waveguide structure on the second p-InP cover layer and the p-InGaAs contact layer, and depositing a silicon dioxide layer in a large area; 5, etching the silicon dioxide layer in the middle of the ridge-type waveguide structure so as to form a window; and 6, sputtering to form a P-surface electrode and evaporating to form an N-surface electrode on the surfaces of the ridge-type waveguide structure and the window.

The invention discloses an optical waveguide type light combiner which comprises a plurality of optical waveguides for light incidence and a plurality of light wave coupling parts, and at most one section of light wave coupling part is arranged between any two optical waveguides for light incidence. The optical waveguide for light incidence includes a base layer, a core layer, and a cladding layer, and the relative refractive index difference between the core layer and the cladding layer is [Delta] 10%. When a plurality of beams of incident light are driven, the incident light forms a beam of emergent light after being coupled by the light wave coupling part, and the emergent light is emitted from the non-incident end of the optical waveguide for propagating the incident light with the non-longest wavelength. The invention further discloses a projection device adopting the optical waveguide type light combiner. Compared with the prior art, the optical waveguide type light combiner disclosed by the invention is high in light limiting capability, and the usable bending radius is smaller; a plurality of beams of light in different waveguides can be efficiently combined into one beam of waveguide; the overall coupling power loss of the light combiner is less than 25% of the incident light power.

A winglet device with adjustable angle includes a wingtip holder (1), insert blocks (2), connecting rods (3) and compression springs (4). The wingtip holder (1) is connected with the wingtip; one side of the wingtip holder (1) is provided with two or more grooves; both ends of each groove are respectively provided an insert block groove in a non-rotating shape and a blind hole; the shape of the insert blocks (2) is consistent with the shape of the insert block grooves, and the insert blocks are inserted into the insert block grooves; the outer end face of each insert block (2) is provided with a ring of adjustment grooves circumferentially arranged, and each adjustment groove forms a centrosymmetric figure along the center of the circumference; one end of each connecting rod (3) is provided with a ring of projections matching with the adjustment grooves, the projections are in the adjustment grooves, and the connecting rods (3) are connected with the winglet; and one end of each compression spring (4) is arranged in the blind hole, and the other end of each compression spring abuts against the other end face of the connecting rod (3) and is axially compresses the connecting rod (3). The winglet device has the advantages of small space occupation, light weight, and the many adjustable angles.