49results about How to "Lower difficulty requirement" patented technology

The invention discloses a coverage draping method, comprising the steps of I, selecting white paper 80 cm in length and width, drawing a basic form of clothing according to the actual dimensions of the clothing, cutting off along the drawn lines with scissors, pasting the cut lines according to an original pattern with double-sided adhesive tape to obtain paper sample I; II, placing the paper sample I of step I on a model form, fixing with pins, cutting off redundant paper from the initial paper sample on the model form while necessary looseness is reserved to obtain paper sample II, drawing required cutting lines on the paper sample II, and pasting with red markings to obtain paper sample III; III, attaching cloth to the paper sample III. The coverage draping method is convenient and handy and is easy to master, the learning difficulty is effectively reduced, and draping is effectively popularized.

The invention relates to a coal mine underground automatic bidirectional explosion suppression device and a use method. The bidirectional explosion suppression device comprises a sleeve, a connectingtwo-way joint, a piston barrel, a high-pressure cavity assembly and a push rod. A receiving plate is fixedly arranged on the push rod. A spraying cavity filled with dry powder is formed between the high-pressure cavity assembly, the piston barrel and an outer cover on the side where the high-pressure cavity assembly and the piston barrel are located. The interior of the high-pressure cavity assembly communicates with the interior of the piston barrel. A piston is slidably connected in the piston barrel in a sealed mode, the barrel wall of the piston barrel is provided with an air injection hole capable of enabling the spraying cavity to communicate with the interior of the piston barrel, and is provided with a through hole containing a limiting ball, the piston is provided with a step located on the side, away from the two-way joint, of the limiting ball, and grooves are formed in two sides, opposite to the limiting ball, of the sleeve respectively. The requirement for the moving distance of the piston is lowered, and it is only needed to ensure that high-pressure gas in the high-pressure cavity assembly pushes the piston away from the gas spraying hole. Bidirectional trigger can be carried out, and when one side is triggered, two sides of the device can spray dry powder, so that the explosion-proof area is increased.

The invention relates to a coal mine underground automatic bidirectional explosion suppression device and a use method. The bidirectional explosion suppression device comprises a sleeve, a connectingtwo-way joint, a piston barrel, a high-pressure cavity assembly and a push rod. A receiving plate is fixedly arranged on the push rod. A spraying cavity filled with dry powder is formed between the high-pressure cavity assembly, the piston barrel and an outer cover on the side where the high-pressure cavity assembly and the piston barrel are located. The interior of the high-pressure cavity assembly communicates with the interior of the piston barrel. A piston is slidably connected in the piston barrel in a sealed mode, the barrel wall of the piston barrel is provided with an air injection hole capable of enabling the spraying cavity to communicate with the interior of the piston barrel, and is provided with a through hole containing a limiting ball, the piston is provided with a step located on the side, away from the two-way joint, of the limiting ball, and grooves are formed in two sides, opposite to the limiting ball, of the sleeve respectively. The requirement for the moving distance of the piston is lowered, and it is only needed to ensure that high-pressure gas in the high-pressure cavity assembly pushes the piston away from the gas spraying hole. Bidirectional trigger can be carried out, and when one side is triggered, two sides of the device can spray dry powder, so that the explosion-proof area is increased.

The invention discloses a long range active response loop wire set, which is used in the field of railway signal automatic control to account for the difficulty of changing the command of controlling vehicles and answering machine receiving, detecting and maintaining system in the existing technology. This set includes electrical design which is compatible to European standard about the basic function of the active answering machine, and the elongated active response loop wire design. In this invention, the active response loop wire set is installed in the middle of two steel rails to replace standard answering machine, the loop wire of this set is as long as 4 meters, the parameter of electric resonance point is 4.23 MHz, this set can send 4.23 MHz FSK carrier frequencies semaphore which is compatible to standard answering machine to railway engine. After using this invention, the rigor request of railway engine positional accuracy can be relaxed, which is indicated that as long as the railway engine stops at the active response loop wire set of 4 meters long, information continuously received can be implemented, greatly reduces the railway engine position request when change the command of controlling machine and the answering machine implements receiving, detecting, maintaining and employing.

The invention provides a rectangular optical frequency comb generation system based on an on-chip silicon nitride micro-ring. The system comprises a tunable laser, a first optical coupler, a second optical coupler, an erbium-doped fiber amplifier, a polarization controller, a first optical isolator, a second optical isolator, a Si3N4 micro-ring resonant cavity, a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a data acquisition unit and a polarizer. Compared with an optical frequency comb based on dissipative optical solitons in a microcavity inthe prior art, the provided system has the following advantages: the comb tooth power of the rectangular optical frequency comb is remarkably more uniform, and particularly, a problem that the edge power of the optical frequency comb is reduced is solved, so that more comb tooth power is maintained at a high level, and the energy conversion efficiency of the optical frequency comb and the absoluteenergy of the comb teeth are remarkably improved.

The invention provides a signal testing system which comprises a PI module, an ALGO module and an EOM module, the PI module is used for receiving a plurality of initial clock signals which are orthogonal in pairs and a clock phase control signal sent by the ALGO module and outputting a target clock signal, and the EOM module is used for receiving a to-be-tested signal, the target clock signal and a threshold voltage control signal sent by the ALGO module and outputting the target clock signal. The EOM module is used for outputting a statistical result of sampling a to-be-detected signal, the ALGO module is used for receiving the statistical result, determining an eye width value and an eye height value of an eye pattern of the to-be-detected signal, and sampling and counting the to-be-detected signal by using a target clock signal input by the phase interpolation PI module and a threshold voltage control signal sent by the ALGO module through the EOM module; the ALGO module determines the eye width value and the eye height value of the eye pattern of the to-be-tested signal according to the obtained statistical result, automatic storage and reading of the eye height and the eye width of the high-speed signal are achieved, and the power consumption of the signal testing system is low.

The invention provides an annular optical fiber with an asymmetrical optical grating and application in orbital angular momentum generation thereof. A hollow core annular optical fiber can increase the effective refractive index between degeneracy-similar modes, thereby preventing crosstalk between the modes. A long period optical grating inscribed on the upper half ring of the hollow core annular optical fiber breaks a circular symmetry structure of the optical fiber and achieves conversion between angular non-same order modes. When input light is of a circular polarization fundamental mode, a first-order orbital angular momentum mode can be generated. The hollow core of the hollow core annular optical fiber is filled with an optical functional material with the refractive index adjustable and the wave length for generating the orbital angular momentum mode can be tuned by the refractive index of the liquid, so that the structure can generate the orbital angular momentum mode in an adjustable cross band wave length range. Simulation shows that when the optical grating period is 292 [mu]m and the optical grating length is 1.460cm, the range of broad band wave lengths with the angular momentum mode conversion rate higher than 90% can reach 237nm, the greatest conversion rate is 98.91%, and the modulation rate of the refractive index of the filling liquid for the wave lengths for orbital angular momentum mode generation is 400nm / RIU.

The invention discloses vapor deposition equipment as well as a wafer heating platform deck and a heating method thereof. The vapor deposition equipment comprises a platform deck body, an ejector pin body and a heating device, the heating device is arranged in the ejector pin body; a through hole is formed in the carrying table body, and the ejector pin body penetrates through the through hole; the ejector pin body is used for bearing a wafer and placing the wafer on the upper surface of the carrying table body, the heating device heats the ejector pin body, and the ejector pin body and the carrying table body jointly transfer heat to the wafer. The heating device is additionally arranged in the ejector pin body, so that the ejector pin body is heated by the heating device, the ejector pin body and the carrying table body jointly transfer heat to the wafer, the ejector pin body can reduce heat lost in the through hole or make up the heat lost in the through hole, and then the non-uniform heating degree of the wafer on the carrying table body is reduced; or the phenomenon that the wafer is heated unevenly on the carrying table body is avoided, the forming speed of a film on the upper surface of the wafer can be increased, the thickness of the film is increased, and the film forming efficiency of the surface of the wafer is improved.

The invention relates to a design method of a rhombic grid hole hot air grate sand core. The rhombic grid hole hot air grate sand core is characterized by consisting of a plurality of sand core units, wherein each sand core unit comprises a lower core head, an upper core head and a sand core body; the size and shape of the lower core head correspond to the size and shape of a cone frustum-shaped hole core of a corresponding porous core positioning general template for shaping; the shape and quantity of grate ventilation grid hole cores are determined according to the shape and quantity of designed grate ventilation grid holes; and each rhombic ventilation grid hole core consists of two regular triangles. Compared with the prior art, the method has the beneficial effects that: (1) according to the characteristic that the ventilation grid hole of a rhombic grid hole grate consists of two regular triangles, the cone frustum-shaped structure of a multi-hole-core positioning general template and a cone frustum-shaped lower core head which corresponds to the gravity centers of two regular triangles constituting a rhombic hole grid can be positioned accurately; and (2) due to the adoption of the cone frustum-shaped core head, the generality of the general template can be increased, and hot air furnace grates of other hole forms can be produced by using the multi-hole-core positioning general template.

The invention relates to a spectrum analysis system and a spectrum analysis method for component detection. The spectrum analysis system is applied to a metal component analysis device. The spectrum analysis equipment comprises a noise-reducing treatment module, a correcting and modeling module, a detecting and analyzing module and a communication module, wherein the noise-reducing treatment module is used for performing noise-reducing treatment on the spectrum data of a corrected metal sample and on the spectrum data of a detected metal sample; the correcting and modeling module is used for modeling with chemometrics software based on the spectrum data of the corrected metal sample to obtain a metal component measuring model; and the detecting and analyzing module is used for analyzing by using the metal component measuring model and the spectrum data of the detected metal sample. By adopting the technology, a correcting model for metal component analysis is established by combining chemometrics and modeling for selectively extracting information related to a sorted target and inhibiting influence of non-related characteristics and noise, so that influence on spectrum caused by various non-target factors can be effectively eliminated, and the technical effect of better spectral analysis is achieved.

The invention provides a full automatic gas recovering and charging device which comprises a first pipeline, a first oil separator, a compressor, a second oil separator, a work tank and a second pipeline. One end of the first pipeline is communicated with a low-voltage charging end of a car air conditioning system. The first oil separator is respectively communicated with the first pipeline and the compressor. The work tank is respectively communicated with the compressor and the second pipeline. The second pipeline is communicated with a high-voltage charging end of the car air conditioning system. The position of the first pipeline is provided with a first magnetic valve which controls the on and off of the first pipeline. The second pipeline is provided with a second magnetic valve which controls the on and off of the second pipeline. The full automatic gas recovering and charging device further comprises a first pressure sensor and a controller. When the full automatic gas recovering and charging device is connected with the car air conditioning system, the first pressure sensor is connected with the car air conditioning system to detect the pressure inside the car air conditioning system, and the controller is electrically connected with the first pressure sensor, the first magnetic valve, the compressor and the second magnetic valve.

The invention relates to a driving device for a pulse laser. The driving device comprises a drive and power supply module and a laser module; the drive and power supply module comprises a power supply source unit and a pulse generating unit; the power supply source unit is used for supply power to the laser module and the pulse generating unit; the pulse generating unit is used for generating electrical pulses according to a required pulse parameter; the laser module comprises a pulse level conversion unit, a pulse current switch and the pulse laser; the pulse level conversion unit is used for stepping up the electrical pulses generated by the pulse generating unit to a required electrical level so as to meet the driving requirements of the pulse current switch; the pulse current switch is used for driving the pulse laser; the power supply source unit is respectively connected with the pulse level conversion unit and the pulse laser through power supply leads; and the pulse generatingunit is connected with the pulse level conversion unit through a coaxial cable. According to the driving device for the pulse laser, the short driving distance of the pulse laser can be prolonged, and the driving quality can be improved.

The present invention relates to an ion concentration monitoring apparatus for purifying blood. It includes detection control circuit, electroconductivity sensor and temperature sensor. The output end of the described temperature sensor is connected with collecting and processing circuit in the described detection control circuit. It is characterized by that the described detection control circuit also includes: the input end of elecroconductivity / frequency conversion circuit is connected with output end of electroconductivity sensor, the output end of said electroconductivity / frequency conversion circuit is connected with frequency signal shaping circuit, the output end of frequency signal shaping circuit is connected with input end of the described collecting and processing circuit. The described electroconductivity sensor is formed from first and second graphite rings and first and second electrodes, the described first and second electrodes are respectively fixed on outer walls of first and second graphite rings, said first and second electrodes are also connected with electroconductivity / frequency conversion circuit conductor.

The invention discloses an auxiliary device used for controlling tongue-and-groove size manufacturing precision. The auxiliary device comprises a magnetic angle iron (1), a calibrated scale (2), and an iron sheet (3). The magnetic angle iron (1) comprises a groove plate (4) and a scale plate (5), and the side edge of the scale plate (5) is provided with scales. The calibrated scale (2) is provided with a strong ferromagnetic device (6). The calibrated scale (2) is provided with the scales used to correspondingly extend the scales of the scale plate (5), and the calibrated scale is an elastic telescopic member. One surface of the calibrated scale (2) is provided with the iron sheet (3), which is a fixable movable member, and is disposed on the side of the magnetic angle iron (1) opposite to a bending direction, and is fixedly disposed on the calibrated scale (2) by a locking device (7). The invention also discloses a method used for controlling the tongue-and-groove size manufacturing precision. The auxiliary device and the method have advantages of simple structure, convenient use, and high measurement precision.

The invention relates to a cylindrical mirror lens and a method for aligning a plurality of cylindrical mirror buses. The method comprises the following steps: fixing each cylindrical mirror in a corrThe invention relates to a cylindrical mirror lens and a method for aligning a plurality of cylindrical mirror buses. The method comprises the following steps: fixing each cylindrical mirror in a corresponding picture frame to form a plurality of cylindrical mirror assemblies; processing and treating the cylindrical mirror assemblies; making lens cylinders according to the shape of each cylindricaesponding picture frame to form a plurality of cylindrical mirror assemblies; processing and treating the cylindrical mirror assemblies; making lens cylinders according to the shape of each cylindrical mirror assembly; respectively and fixedly mounting the cylindrical mirror assemblies in the lens cylinders; and rotating the cylindrical mirror assemblies so that all the buses of the cylindrical mil mirror assembly; respectively and fixedly mounting the cylindrical mirror assemblies in the lens cylinders; and rotating the cylindrical mirror assemblies so that all the buses of the cylindrical mirror assemblies are arranged on the same plane. The method simplifies an adjusting link for aligning the cylindrical mirror buses. The lens made by the method has simplified and stable structure, lowerror assemblies are arranged on the same plane. The method simplifies an adjusting link for aligning the cylindrical mirror buses. The lens made by the method has simplified and stable structure, lowers the difficulty requirements for the optical processing precision and the processing technology of the cylindrical mirrors and improves the lens use reliability, and each dismounted cylindrical mirrrs the difficulty requirements for the optical processing precision and the processing technology of the cylindrical mirrors and improves the lens use reliability, and each dismounted cylindrical mirror assembly can be precisely reset and is convenient to assemble and disassemble and maintain.or assembly can be precisely reset and is convenient to assemble and disassemble and maintain.

The invention discloses a four-mode resonator loaded with high resistance lines, and relates to the field of microwave passive devices. The resonator is composed of a dual-mode resonator and two symmetrically distributed high-impedance lines connected to the transmission line, wherein the dual-mode resonator is a folded half-wavelength resonator, and the two arms of the metal patch are folded inward , there is a via hole at the center of the bottom of the patch, and two high-impedance lines are symmetrically attached to both sides of the dual-mode resonator and connected to the transmission line. All the above structures are printed on the front side of the dielectric substrate, and the backside of the substrate is completely covered with metal. The resonator overcomes the need for multiple resonators in the existing ultra-wideband notch devices to achieve multiple notch stop bands, frequency selectivity and notch bandwidth and other performance needs to be improved, and the resonant structure is difficult to apply or transplant to other different radiating units Insufficient such as UWB system.

The present invention provides a feature extraction method and device, which solves the problem of unsatisfactory matching effect of images with large shooting angle differences in the prior art. The method includes: extracting the feature points of the original image; assigning each of the feature points two or more scale windows of different sizes; in each scale window, using the feature point as the center of the scale window as a seed point The region grows to obtain more than two foreground regions corresponding to each feature point, and the number of foreground regions corresponding to each feature point is equal to the number of scale windows assigned to each feature point; calculate each of the foreground A covariance matrix of the area; performing affine deformation correction on the original image according to the covariance matrix of the foreground area; extracting feature points from the corrected image, and performing feature point description. Using the method can significantly improve the image matching effect, and is easy to implement and easy to popularize and apply.