42results about How to "Improve error tolerance" patented technology

Genomic sequence matching and alignment techniques are disclosed. In one embodiment, an index of a reference sequence is constructed that represents all transitions from a single l-mer prefix to multiple m-mer suffixes. This index data structure may take a variety of forms, including an array or a tree. The base position of each transition from l-prefix to m-suffix is recorded in k-bit masked form. The positions data structure may take a variety of forms as well, including an array or a tree. The l-prefix, m-suffix and k-position index is used for rapid assessment of similarity between a query and a reference genomic sequence by means of a table of local hits.

The invention provides a space deployable mechanism comprising multiple identical folding deployable units which are arranged symmetrically left and right. Each folding deployable unit comprises two identical vertical rods arranged longitudinally, two identical first chord members, two identical second chord members and two identical third chord members, wherein the starting ends of the two first chord members are connected to the upper ends of the two vertical rods through rotating pairs respectively, the tail ends of the two first chord members are mutually connected through a rotating pair to form a V-type rod, the middles of the two second chord members are mutually connected through a rotating pair to form a scissor form mechanism, the starting ends of the two second chord members are connected to the lower ends of the two vertical rods through rotating pairs respectively, the starting ends of the two third chord members are connected to the lower middle parts of the two vertical rods through rotating pairs respectively, and the tail ends of the two third chord members are connected to the tail ends of the two second chord members through rotating pairs respectively. The space deployable mechanism is good in deployable performance, high in rigidity and error containment and low in machining and manufacturing requirement.

The invention discloses a high-efficiency grating coupler based on an intermediate-refractive-index waveguide material. The specific structure is a substrate, a lower cladding layer, an intermediate-refractive-index material layer, an insulating layer, an amorphous silicon grating, and an upper cladding layer from bottom to top. The invention also discloses a preparation method of the high-efficiency grating coupler based on the intermediate-refractive-index waveguide material. The method comprises the following steps of: first preparing a waveguide lower cladding layer and the intermediate-refractive-index material layer on the substrate; implementing a waveguide device in the intermediate-refractive-index material layer; growing an insulating layer and amorphous silicon on a surface of asample; transferring a grating structure to an electron beam glue or a photoresist layer by an electron beam or an ultraviolet exposure, and forming a grating pattern after development; and then transferring the grating structure to the amorphous silicon grating by an etching process; and finally, removing the electron beam glue or the photoresist layer, and growing the upper cladding layer. Theinvention has the advantages of simpler process steps, lower cost and higher tolerance of errors.

The invention provides a solar photovoltaic system, which comprises a photovoltaic battery and a sun tracker. A round optical condensation component for condensing light is arranged in front of the photovoltaic battery and comprises an incident face and an emergent face; the emergent face is provided with a plurality of sawtooth concentric rings which are connected in sequence; the radial widths of the sawtooth concentric rings are equal, and each sawtooth concentric ring comprises a first surface which is vertical to the emergent face and a second surface which is arc-shaped and aspherical; one end of the second surface is connected to the emergent face, and the other end of the second face is connected with the other end of the first surface; and each point coordinate on the second surface of the Nth sawtooth concentric ring is shown as (x,y) which meets a specific formula, and a light evener is arranged between the photovoltaic battery and the optical condensation component. The focal spots formed by the solar photovoltaic system are smaller in size and stable in formed position, the condensation ratio is high, the light spots are influenced by band numbers slightly, and the light spots received by the photovoltaic battery are even, thus the integral photoelectric conversion efficiency and flexibility of the photovoltaic system can be improved.

The invention discloses a space target inverse synthetic aperture radar imaging parameter design method. The method comprises the following steps: a target running track and zenith-passing time are calculated; imaging center time is set; an azimuth angle, an elevation angle, imaging on and off time and a target slope distance are calculated; a redundant slope distance and an initial transmitting pulse width are set; a PRF is selected; whether Dc exceeds an upper limit is judged; an echo window length and Dr are calculated; whether the Dr exceeds the storage and transmission capability is judged; the echo starting time is calculated; beam pointing is adjusted; antenna gains and echo signal intensity are calculated; MGC is set; and imaging is carried out. The motion characteristics of the to-be-imaged space target and the limitations of the radar system are thoroughly considered, STK software is combined, the problems of insufficient calculation precision of target motion parameters, radar beam pointing and system parameters in the traditional space target inverse synthetic aperture radar imaging parameter design are solved, and through a mode of combining mechanical scanning and electric scanning, the beam pointing needed for space target inverse synthetic aperture radar imaging is realized, and the realization cost and the complexity are reduced.

The invention discloses a two-stage sub-wavelength grating silicon-based light polarization beam splitting rotator based on asymmetric coupling. Silicon dioxide is used as a substrate, and air is usedas an upper cladding to break vertical symmetry; a polarization beam splitting rotator main body is formed by using a silicon waveguide; the silicon waveguide is divided into three parts: a waveguide1 is a primary coupling sub-wavelength grating waveguide, the characteristic size of the waveguide is equivalently expanded, and the manufacturing tolerance is further increased; the waveguide 2 is atwo-stage conical etching waveguide, the first-stage conical etching and the waveguide 1 complete phase matching to achieve polarization rotation, and the second-stage etching recovers the thicknessof the waveguide to participate in second-stage coupling; and the waveguide 3 is a secondary sub-wavelength grating waveguide and is used for carrying out secondary coupling filtering on the residualTM0 polarization mode. According to the polarization beam splitting rotator, multi-stage coupling is adopted, a multi-stage filtering structure achieves the high polarization extinction ratio and thelarge manufacturing tolerance under the compact structure, and the polarization beam splitting rotator has important application in optical communication and photoelectric signal processing.

The invention provides an OCT conjugated mirror image removal device and method capable of eliminating multicolor errors. The device includes a CCD camera, a ruling grating, an upper computer, a piezoelectric ceramic, a beam splitter, a sample, an objective lens, a GRIN fiber collimator, and a super radiance light emitting diode. Through adoption of the device and the method, signal reconstructionis performed on an interference signal, fixed phase shift amount is corrected by utilizing the wavelength of a broadband light source, and a set of varying phase shift amount is calculated, and because the corrected phase shift amount is error-free, the reconstructed interference signal is not affected by the multicolor errors of the broadband light source. Rapid Fourier transform is performed onthe interference signal to eliminate a conjugated mirror image, and the detection depth of a system is doubled. Without increasing the amount of data of traditional phase shifting methods, the effectof the multicolor errors of the broadband light source is completely removed, and the error tolerance of the system is improved.

The invention discloses a novel motor train unit bogie replacing unit which comprises a main body framework, a supporting head mechanism and a ballast bed mechanism. A supporting head can be driven byitself along a supporting head walking rail so as to be aligned with a motor train unit lifting point. The ballast bed mechanism comprises a ballast bed and a lifting mechanism; the ballast bed is provided with a rail; and the lifting mechanism drives the ballast bed to reciprocate in a height direction so that the rail is selectively in butt joint with the fixed rail to form a continuous rail oris in butt joint with a negative working layer. When the lifting mechanism drives the ballast bed to be in a lifting state, the rail and the fixed rail are in butt joint to form the continuous rail.When the lifting mechanism drives the ballast bed to descend from the lifting state to a first descending state, the rail is in butt joint with the negative working layer, and the supporting head lifts a carriage. Synchronous lifting is easy to control, the unit is suitable for replacement operation of motor train unit bogies of all types, and an underground space can be effectively utilized for maintenance operation.

The invention relates to a copper-oxygen-based high-temperature superconducting single-photon detector and a preparation method thereof. The single-photon detector comprises a substrate, a copper-oxygen-based high-temperature superconducting micron wire and a dielectric film reflector which are sequentially arranged from bottom to top, a nanopore array is arranged in the copper-oxygen-based high-temperature superconducting micron wire, and metal nanoparticles are arranged on the copper-oxygen-based high-temperature superconducting micron wire. The single-photon detector works at the liquid nitrogen temperature of 77K, the use and storage cost of liquid nitrogen is greatly lower than that of liquid helium equipment, and the use of the single-photon detector is facilitated. The detector adopts a working mode of back incidence, Meanwhile, the local enhancement effect of the metal nanoparticles is utilized, so that the light absorption rate of the device is improved, and the detection efficiency of incident light in each polarization direction is enhanced on the whole. The preparation method of the copper-oxygen-based high-temperature superconducting single-photon detector is low in working cost and simple in preparation process.

The invention relates to a method for imaging a space target by an on-orbit SAR satellite, which fully considers the high-speed relative motion characteristics of the on-orbit SAR satellite and the space target to be imaged and the system limitation, and combines STK software to solve the problems that the relative motion of the SAR satellite and the space target is complex, the geometrical relationship is difficult to determine and the imaging parameter precision requirement is high in the space target imaging process. By selecting a proper pulse repetition frequency, effective reception of the echo of the space target to be imaged is ensured, and interference of emission pulse, sub-satellite point echo, ground scene echo and the like is avoided at the same time. Through the mode of combining satellite attitude maneuver and antenna electric scanning, the beam pointing required by the SAR satellite for space target imaging is realized, the implementation cost and complexity are reduced, and the application range of the on-orbit SAR satellite is expanded.

The invention discloses a plastic sealing mold and a plastic sealing method. The plastic sealing mold comprises: a base with an accommodating cavity; Among the interchangeable cavity frames, at least two cavity frames have different sizes; each cavity frame can be accommodated in the accommodating cavity, and is detachably connected with the base; and, the inserts are stored in the inside the cavity frame and adapted to the inner wall of the cavity frame, so that the surface of the insert near the side of the accommodating cavity and the inner wall of the cavity frame form a plastic-encapsulated cavity. The invention can process plastic-sealed products with different needs; reduces the manufacturing cost of the plastic-sealed products; also improves the machine utilization rate of the plastic-sealed mold, thereby improving the production efficiency and production efficiency of the plastic-sealed mold.

The invention provides a design method of an on-chip photonic device based on appearance contour regulation and control. The design method comprises the steps of determining functions, a design targetand a design area of the device; discretizing the appearance contour of the device in the design area into a plurality of points; restoring the appearance profile curve of the device on the basis ofthe discrete points in the previous step by using an interpolation method, and replacing the original appearance profile curve; and performing iterative search on the discrete points by using a searchalgorithm, and changing the appearance contour in the design area until the device meets the design target. By adopting the technical scheme of the invention, the design method and the design dimension of the on-chip photonic device are expanded, the requirements of the on-chip photonic device on wider bandwidth, higher error tolerance and smaller size are met, the design goals of more functions,higher standards and smaller size are achieved, and the convergence rate is greatly improved.

The invention relates to an LED (Light-Emitting Diode) light source installing structure, in particular to an LED light source drilling-free rapid fixing structure. The structure comprises a shell, wherein the back of the shell is provided with a driving power supply, the shell is internally provided with an LED base plate, and the shell comprises a component mounting part and side shell parts; the side shell parts extend downwards from two side of the component mounting part, the upper surface of the component mounting part is provided with one or more driving power supply fixing grooves which are concave inwards, and the driving power is fixedly arranged in the driving power fixing groove by virtue of a fastening piece; the lower surface of the component mounting part is provided with an LED base plate fixing groove, and the inner wall of the side shell part on one side is provided with a clamping slot. The tolerance fault tolerance is greatly improved by virtue of the LED light source drilling-free rapid fixing structure, the LED base plate is matched with the clamping slot by virtue of the single fastening piece, so as to realize fixing; the mounting difficulty is lowered, the cross-ventilation is convenient, the better heat dissipation is realized, the fastening piece can be arbitrarily selected and arranged in the mounting groove, so that the LED light source drilling-free rapid fixing structure is capable of providing convenience for splicing and position adjusting of the LED base plate.

The invention discloses an integrally forged iron golf club head and its manufacturing method, comprising the head body, the weight components and a cover. A connecting recess is arranged inside the head body. The weight components are installed in the connecting groove and the material of the weight components is composite ceramic with a density of 1.3 to 3.5 g/cc. The cover is welded to the meshing groove of the head body and the weight components are sealed by the head and the cover without any gap. The density of the integrally forged iron head is lower in the center area than that in thesurrounding area. So with bigger error margin, larger hitting area, and louder hitting sound, the player can feel better.

The invention discloses a cascaded waveguide-based end face coupler with a double-step structure. The cascaded waveguide-based end face coupler is formed by cascading a first waveguide and a second waveguide, introducing a ridge waveguide on the first waveguide; the end surfaces of the ridge waveguide and the first waveguide are flush to form an initial input end surface of the coupler, and the initial input end surface is completely matched with the size of the AWG output waveguide; the length of the ridge waveguide is equal to that of the first waveguide, the width of the ridge waveguide is gradually reduced from the initial input end face to the output end face, and the projection of the ridge waveguide on the first waveguide is an isosceles trapezoid; the second waveguide adopts a regular conical structure which is three-dimensionally reduced from the waveguide input end face to the waveguide output end face, the size of the second waveguide input end face is matched with that of the first waveguide output end face, the size of the output end face of the second waveguide is completely matched with that of the ridge waveguide of the photoelectric detector, and the first waveguide, the second waveguide and the ridge waveguide are of a double-step structure. The coupler is small in size, low in loss, high in error tolerance and capable of achieving efficient coupling of waveguides of different sizes.

Systems and methods transfer diecuts from a liner layer to a surface. One method may transfer a diecut from the liner layer to the surface by means of an applicator, wherein a ratio of the pull-off force of the diecut from the liner layer in the z direction to the pull-off force of the diecut from the surface in the z direction is at most 0.18. The method may enable particularly reliable and firmtransfer of the diecut from a diecut tape to a surface where bonding is to take place. As a result, it may be possible for the frequency of errors in the bonding of plastics parts to be relevantly reduced.