49 results about "Free distance" patented technology

The invention discloses a fully-coherent continuous-wave Doppler radar and a distance measurement and velocity measurement method thereof. According to the fully-coherent continuous-wave Doppler radar and the distance measurement and speed measurement method thereof, difference-frequency complex signals obtained by mixing echo signals and transmitted signals are acquired; according to the modulation characteristics of distance difference-Doppler frequency and target distance-velocity, a distance-dimension FFT and azimuth-dimension MTD-combined two-dimensional joint detection method is adopted to independently obtain fuzziness-free radial velocity information based on a plurality of coherent high-repetition frequency modulation signals; Doppler information introduced by velocity is removed from the frequency-domain information in the distance dimension, so that the influence of distance-velocity coupling can be eliminated, and therefore, accurate distance information can be obtained. The fully-coherent continuous-wave Doppler radar and the distance measurement and velocity measurement method thereof of the invention have coherent radar velocity measurement function and a continuous-wave radar distance blind zone-free distance measurement function and can satisfy requirements for distance blind zone-free and simultaneous distance measurement and velocity measurement, real-time performance, miniaturization and low power consumption.

Plasma treatment apparatus and method for treating a substrate (6, 7) e.g. for deposition of a layer on the substrate (6, 7). Two opposing electrodes (2, 3) and a treatment space (5) are provided. A dielectric barrier (6, 7; 2a, 3a), comprising in operation the substrate, is provided in the treatment space (5) between the at least two opposing electrodes (2, 3) which are connected to a plasma control unit (4). A gap distance (g) is the free distance in the treatment space (5) of a gap between the at least two opposing electrodes (2, 3) in operation. A total dielectric distance (d) is the sum of the dielectric thickness of the dielectric layers (2a, 3a) and the substrate (6, 7). The product of gap distance (g) and total dielectric distance (d) is controlled to a value less than or equal to 1.0 mm2.

According to the present invention, when an apparatus performs reproduction from an optical disc of a format not compatible to the apparatus, the apparatus is prevented from obtaining an incorrect address and thus causing a malfunction. A recording method according to the present invention performs first conversion of bit-inverting m number (1≦m<n; m an integer) of symbols at prescribed positions of a code word coded using an error correction code by a Reed-Solomon code and including symbol C(i) [i=C=0, 1, 2, . . . n; n is an integer] to generate conversion information; and records the conversion information on a first recording medium. The first conversion is set such that a distance between first information obtained by performing inverse conversion to the first conversion on the conversion information, and second information obtained by performing inverse conversion to second conversion, which is different from the first conversion, on the conversion information, is at least ½ of a minimum free distance of the error correction code.

The invention discloses an automatic guided vehicle comprising a vehicle body, a differential control device, a navigation control device, a steering control device, an obstacle avoidance device, a liftable climbing mechanism, a power supply device, and a main control device. According to the invention, the differential control device employs a two-wheel independent driving way and controls steering and drive steering based on the differential value; and with cooperation of the navigation control device, crooked moving of the vehicle body is prevented. An electronic gyroscope of the steering control device collects an azimuth signal of the vehicle body and outputs the azimuth signal to the main control device for processing. The main control device outputs an instruction to control the differential control device to make motion, thereby realizing pivot steering of the vehicle body. When the vehicle walks, a collision avoidance distance is set; and with a range finding sensor of the obstacle avoidance device, adjustable detection of the free distance can be realized, so that safety driving of the vehicle can be guaranteed. The liftable climbing mechanism employs a stepping motor to realize precise position adjustment of the lifting mechanism, so that full-range precise height adjustment is realized during carrying of tooling vehicles with different height requirements can be realized.

The invention discloses a combined cone lens for generating a long-distance diffraction-free Bessel beam. The combined cone lens has a structure formed by tightly gluing two conical surfaces of a positive-axis pyramid and a negative-axis pyramid. Base angles of the conical surfaces of the positive-axis pyramid and the negative-axis pyramid are equal, and a refractive index of the positive-axis pyramid is slightly more than that of the negative-axis pyramid. In the invention, the positive-axis pyramid and the negative-axis pyramid can be manufactured by using two kinds of common optical glass having slightly-different refractive indexes and combined, and the long-distance diffraction-free Bessel beam can be obtained by a combined single element, so the problems that the conventional pyramid cone has a small cone angle and is difficult to process are solved. The combined cone lens for generating the long-distance diffraction-free Bessel beam has the advantages of easiness of element processing, simple structure, high conversion efficiency and high light damage threshold and provides a new simple and effective way to acquire the long-distance diffraction-free Bessel beam. Moreover, a diffraction-free distance of the diffraction-free Bessel beam can be adjusted by adjusting the radius of an incident beam and a difference value between the refractive indexes of the positive-axis pyramid and the negative-axis pyramid. The combined cone lens for generating the long-distance diffraction-free Bessel beam has a great practical value in the fields of high-precision collimation, large-scale linear measurement, equipment manufacturing industry and laser communication.

The invention relates to a quality control method and an ultraviolet disinfection device which comprises an ultraviolet lamp digital display intelligent switch, an ultraviolet lamp tube free distance adjustment automatic lifter and an ultraviolet lamp tube wiping tool, wherein, the ultraviolet lamp digital display intelligent switch is used for controlling the opening and the closing of an ultraviolet lamp tube at definite time and cumulating and recording the irradiation time of the ultraviolet lamp tube; the ultraviolet lamp tube free distance adjustment automatic lifter is used for controlling the installation effective distance of the ultraviolet lamp tube and ensuring the best effect of disinfection; the ultraviolet lamp tube wiping tool is an S-shaped hook which is crossly arranged at the top end of an adjustable telescopic brace rod, and the ultraviolet lamp tube wiping tool can facilitate the wiping of accumulated dust on the lamp tube; the use of the method and the device canrealize the automatic control of the ultraviolet disinfection, control the nosocomial infection and can prevent the infectious diseases, so the method and the device can be widely applied to various hospitals, various laboratories, pharmaceutical plants and food plants for surface disinfection of air and objects, thus maintaining the cleanliness of the ultraviolet lamp tube and the effective penetrability and improving the quality and the level of the ultraviolet disinfection.

A filter fan of a switch cupboard or of an electrical and / or electronic device placed in a casing with a blast producing an air flow and with a filter element (3) which is placed in the air flow and separates a clean side, on which the blast is placed, from an unclean side, wherein the filter element is held in a frame which can be fixed on the casing by covering the air passage opening penetrating through the casing wall and wherein a protective grid (4) is placed between the filter element (3) and the blast, the invention proposes that a bridging-free distance is provided between the filter surface of the filter element (3) and the protective grid (4), wherein this distance is dimensioned so as to make possible the discharge of water drops on the clean side surface of the filter element and to avoid a contact of the water drops with the protective grid.

The invention relates to a device and a method for evaluating the accuracy of prism-free distance measurement of a total station. The device comprises two rotatable fixed platforms with scales; positioning parts located on the fixed platforms; and a length measuring tool for measuring the distance between positioning points of the positioning parts on the two fixed platforms. The device cooperates with a total station to perform analysis, wherein the total station and the two positioning parts are in triangular distribution, coordinates of the positioning points of the two positioning parts are measured by the total station, and the distance between the two positioning points is calculated and compared with the distance obtained by the length measuring tool, to analyze the distance measurement accuracy of the total station. The inventive evaluating device and method can analyze the measurement accuracy of the total station in a prism-free mode to obtain corresponding analysis data, to further determine the measurement capacity of the total station under different conditions, and ensures reasonable application of the total station prism-free mode.

Magnetorheological transmission device and method for influencing the coupling intensity of two components, which can be coupled and whose coupling intensity can be influenced. A channel is provided, which contains a magnetorheological medium with magnetically polarizable particles, which can be influenced by a magnetic field. A magnetic field generating unit generates a magnetic field in the channel in order to influence the magnetorheological medium in the channel. A body is disposed in the channel. A free distance between the body and the component is at least ten times greater than a typical mean diameter of the magnetically polarizable particles in the magnetorheological medium. A space with magnetorheological medium is disposed between the body and a component.; The magnetic field is applied to the region in order to optionally chain together the particles and / or wedge or release them with the body.

The invention relates to a method for paving low-traffic roads or paths with a paving slab that is cast in situ and has a width Dx narrower than the smaller value of D1 and D2, wherein D1 is the free distance between the front wheels of a standard haulage truck and D2 is the distance separating the wheels of the rear-wheel train, being the length of the paving slab Lx shorter than the value of the length L of the free distance between the front axle and the first rear axle of the wheel train of the standard haulage truck, such that the dimensions Dx and Lx mean that a single wheel or, alternatively, a single wheel train of the standard truck is always supported by the paving slab, touching same. The method comprises the steps of: providing for paving either a low-traffic road which has neither asphalt or concrete paving, or a low-traffic path; evening out and levelling the road or path to be paved; determining the width and length of the paving slab and establishing the thickness thereof in accordance with the amount of traffic and the traffic load, the bearing capacity of the natural ground, the strength of the concrete, the residual strength thereof and the climate, such that the thickness is between 5 and 15 cm; determining the amount of fiber required for a required design residual strength of between 10% and 50% of the maximum strength of the concrete; and preparing the mixture of concrete and fibers which are selected from steel, glass, polypropylene, carbon or another structural fiber for concrete. In addition, the method comprises pouring the mixture of fiber concrete directly onto the road or path to be paved according to

A female terminal for receiving a flat male terminal with a terminal tab (5), having a rectangular cross-section and a predetermined width (B) and thickness (D). The female terminal includes a contact element (1, 101) having two elastic contact tabs (3, 103) approaching each other along a longitudinal axis (2, 102), the contact tabs opposing contact zones (4, 104) for contacting the terminal tab (5); a hollow, rectangular support element (16, 116) defined by four walls (19, 20, 21, 22; 119, 120, 121, 122), enclosing the contact element (1, 101) and in which the elastic contact tabs (3, 103) are accommodated; and a device (13, 113) for electrically connecting a conductor. A first pair of opposing walls (19, 21; 119, 121) cover the contact tabs (3, 103) and a second pair of opposing walls (20, 22; 120, 122) have an elastic locking tab (26, 126) connected thereto. The elastic locking tabs (26, 126) engage between the elastic contact tabs (3, 103) and hold the contact zones (4, 104) of the contact tabs in a pre-tensioned and contact free manner at a distance (A) from each other, which is smaller than the thickness (D) of the terminal tab (5), in a condition in which the flat male terminal is not inserted. The locking tabs (26, 126) have a free distance (C) therebetween before the insertion of the terminal tab (5), which is smaller than the width (B) of the terminal tab (5) and the locking tabs (26, 126) contact the terminal tab (5) in the inserted position along the longitudinal axis (2, 102) in a contact area which is off-set further from the first end (17, 117) of the support element (16, 116) than the contact zones (4, 104) of the contact tabs (3, 103).

The invention relates to a laser range finder and a laser ranging method. The laser range finder comprises a supporting assembly and a distance measuring main body; the distance measuring main body isprovided with a laser head capable of emitting laser beams; one end of the laser head is rotatably mounted at the supporting assembly; a predetermined angle is formed between the supporting assemblyand a connection line of a measurement starting point and a measurement end point; the distance measuring main body rotates with a connection point of the distance measuring main body and the supporting assembly adopted as a rotation axis; and the laser range finder carries out blocking object-free distance measurement when the distance measuring main body rotates relative to the supporting assembly such that the laser head is aligned with the measurement end point. With the above laser range finder adopted, a distance L between the measurement starting point and the measurement end point of ameasured object can be obtained according to a sine and cosine theorem, so that the length of a measured object with no blocking objects can be measured conveniently when the distance of a measured object with an blocking object is measured, and therefore, the use range of the laser range finder is wide, and convenience can be brought to people's lives.

The invention discloses a compatible convolutional code generator polynomial determination method, a coding method and a coder. The compatible convolutional code generator polynomial determination method determines the target convolutional code generator polynomial at the 1 / (k+1) code rate by adopting the following steps, and k is a positive integer: if k is equal to 1, traversing all convolutional code generator polynomials of convolutional codes at 1 / 2 code rate and calculating the free distance of all the convolutional code generator polynomials, and taking one of convolutional code generator polynomials with larger free distances or a set quantity of convolutional code generator polynomials with the maximum free distance in convolutional code generator polynomials obtained through traversing; and if k is larger than 1, determining the vector of the target convolutional code generator polynomial of the convolutional code at the 1 / k code rate at first, recording the vector as a vector block Ak, and then determining the vector of the target convolutional code generator polynomial of the convolutional code at the 1 / (k+1) code rate based on the vector block Ak. According to the invention, the calculation amount is reduced, the requirement on hardware is lowered, the universality is strong, and the method is very suitable for the HARQ (Hybrid Automatic Repeat Request).

The invention provides an obtaining method of an optimal generation polynomial in a type-II hybrid automatic repeat request (HARQ) system and a repeat system adopting the method, relates to the obtaining method of the optimal generation polynomial in the type-II HARQ system and the repeat system adopting the method, and aims at solving the problem of poor anti-jamming capability of the existing HARQ system. Code words received by the receiving end of the repeat system have the maximum free distance under the given encoder restraining length, the free distance is used as the basis for measuring the intensity of the codebook anti-jamming capability when the Viterbi decoding is used, and the convolutional code error correction capability is determined by the greatest minimum free distance when the Viterbi decoding is adopted by the receiving end; and in the type-II HARQ system, the repeat in each time can be merged into the code words with the new code rate with the original code wards, and the effect equivalent to the once-step emission of the code words with the new code rate at the emitting end is realized. The method and the system provided by the invention are applicable to the technical field of error control.

The invention discloses a control method of an air conditioner. The air conditioner can work in a wind-feeling-free mode. When the air conditioner works in a wind-feeling-free mode, a cool feeling area of the air conditioner in the air flowing direction comprises a wind feeling area and a wind-feeling-free area. The distance between the boundary between the wind feeling area and the wind-feeling-free area and the air conditioner is defined as the wind-feeling-free distance. The wind-feeling-free mode comprises a plurality of wind-feeling-free grades corresponding to different wind-feeling-freedistances. The control method comprises the following steps of S1, detecting whether a target object exists in a front region of the air conditioner or not when the air conditioner is in a wind-feeling-free mode; S2, acquiring the shortest distance between the target object and the air conditioner and comparing the shortest distance with the plurality of wind-feeling-free distances if yes; and S3, switching the air conditioner to a corresponding wind-feeling-free grade according to comparison results so as to enable the target object to be located in the corresponding wind-feeling-free region. By means of the control method of the air conditioner, the wind-feeling-free function and intelligent degree of the air conditioner are improved.

The invention provides a combined axicon device. A negative axicon and a positive axicon are adopted to form the combined axicon device; through replacement of a filling medium between the positive axicon and the negative axicon or changes of the gap between the positive axicon and the negative axicon, the traditional combined axicon can break through limitations from the base angle of a single axicon, high-quality and long-distance diffraction-free beams are generated, the optical medium refractivity between the positive axicon and the negative axicon is changed, and thus, the maximum diffraction-free distance of the combined axicon device can be changed, and tuning on parameters such as the diffraction-free distance is facilitated; and besides, by adopting the combined axicon device, the processing difficulty of a single element can be reduced, the processing cost is thus reduced, and application of the diffraction-free beams is expanded.

The invention relates to a coding method for modulating carrier signals with 16 different digital states (4 bit signals). The aim of the invention is to obtain a high synchronicity robustness and an at least partially improved coding gain. The coding parameters are obtained by the following steps: a) using a 2ASK / 8PSK coding; b) choosing a convolutional code and determining all possible code word sequences with the free distance of the convolutional code; c) producing possible mappings by allocating a partial quantity of the 2ASK / 8PSK channel bits to subsets; d) choosing the mapping at which after determination of the optimum radii (ac,c) of the two amplitudes for every possible mapping, the resulting minimum Euclidean distance takes a maximum value between two possible subset sequences code word sequence.

A system and method provides extended convolutional coding for packets / frames or superframes used in wireless transmission. A wireless system has an extended convolutional encoder / decoder, a wireless network, a server having an extended convolutional encoding / decoding module, one or more clients, at least one of which performs extended convolutional encoding / decoding; and a wireless transmission unit for the server and one or more clients to communicate via the wireless network. A method for providing the extended convolutional encoding includes the steps of retrieving a set of codes from a database that has a maximal-minimal free distance within a certain range; selecting a subset of the retrieved codes that have the smallest number of paths at the maximal-minimal free distance; and finding extended convolutional codes by selecting a code having a certain rate from the subset of codes that have the smallest number of paths at increased free distances to provide the best candidates. The performance of the extended code can be verified prior to encoding.

The invention relates to a dust-free distance fine adjustment oblique cutting saw comprising a disc used for holding wood, a base bearing the disc, a rocking bar and a cutting assembly. The rocking bar is connected with the base and can rotate relative to the base. The cutting assembly comprises a saw web and a motor assembly driving the saw web to rotate. A dust collection protective cover is further arranged between the saw web and the motor assembly. A fan blade and a dust collection bag are arranged at the bottom end of the dust collection protective cover. The dust collection protective cover comprises a first dust collection pipeline and a second dust collection pipeline. Under the action of the fan blade, dust produced by material cutting of the saw web is sucked into the first dustcollection pipeline and a second dust collection pipeline and is discharged into the dust collection bag. The dust-free distance fine adjustment oblique cutting saw disclosed by the invention is simple in structure, the distance between two parts can be adjusted finely, fast and accurately, thus fine adjustment steps are simple and convenient, and real dust-free cutting of wood products is achieved.

A method for weaving the gap structure of ligh-weight composite material by dual-surface weft knitting machine with two needle beds features that the high-performance high-rigidity fibres or yarn is used as raw material for dual-surface knitting. Its advantages are light weight, complex shape and high-temp environment.

The application provides a Viterbi decoding path measurement anti-overflow method. The method comprises the following steps: computing a path measurement bit wide spreading parameter by using free distance and a convolutional code parameter; obtaining the path measurement total bit wide according to the path measurement bit wide spreading parameter and the Viterbi decoding input information bit wide; respectively selecting the highest bit of each state path measurement value according to the path measurement total bit wide so as to obtaining an overflow zone bit by performing OR operation according to the selected highest bit; and performing the anti-overflow processing when the overflow zone bit satisfies the first preset condition. Through the method provided by the application, a Viterbi decoding path measurement accumulation result can be realized through an OR gate, a selector switch and like simple hardware, the non-overflow is represented by the bit wide W, and the overflow problem existent in the Viterbi decoding path measurement can be solved through low complexity and hardware source overhead.

The invention belongs to the technical field of distance measurement and especially relates to a high precision switching free distance measuring instrument. The high precision switching free distance measuring instrument comprises a storage device, a control calculation device, first and second clock generation devices, a transmission driving device, a light emitting element driving device, a light emitting element which generates laser or infrared light beam, first and second half mirrors, a transmission device, a light quantity adjusting device, first and second large object lenses, a reflector, first and second receiving elements, first and second intermediate frequency amplifiers, a high voltage generating device, first and second AD sampling devices, and first and second double-head optical fibers. The invention adopts a high precision distance measurement device, the electric heterodyne frequency mixing technology is used, an internal and external optical path switching free measurement object emits the laser or infrared light beam and receives the reflection light from the measurement object to measure a distance, and the distance is calculated through obtaining the light receiving time difference of intermediate frequency pulse light. The high precision switching free distance measuring instrument has the advantages of stable distance measurement, high precision and no need of the mechanical switching of an optical path and is especially suitable for the distance measurement of a moving object.

The invention discloses a vegetable washer comprising a housing, an external barrel and an inner barrel, wherein the inner barrel is sleeved in the external barrel in a same axis, water-permeable holes are provided on the wall surface of the inner barrel, there is a free distance between the external barrel and the inner barrel, at least one dismountable splitter plate is provided in the inner barrel to separate the space of the inner barrel into several parts. The vegetable washer of the invention has a good cleaning effect and can clean and wash a plurality of vegetables and fresh fruits.

The invention provides a direct-through-cold-and-hot-bridge-free multi-row-hole multifunctional hollow brick, which comprises a brick body, wherein the brick body comprises outer and inner hole walls of multi-row holes and sealed hole shape side walls in the multi-row holes, and at least one hole shape for realizing opening holes at one end or two ends is formed in the two ends of each multi-row hole block body for blocking linear cold and hot bridge passages at the two ends of the block body, such as the hole shapes with the codes being C, D, II and III in the multi-row hole block bodies. Besides staggered sealed hole shapes formed by various mutually-staggered ribs in common use, the multi-row hole block bodies are also specially provided with end rib sealed symmetrical long strip prismatic direct through 0-shaped holes, so longest direct-through-cold-and-hot-bridge-free distance holes are formed in the middle sections of the block bodies, matching edge chamfering or angle chamfering is provided, or semicircular open holes are formed in the center of vertical ribs, or concave-convex anti-crack veins are arranged outside the wall, or interlocking mechanisms are arranged at the two ends in a vertical direction, or concave-convex interlocking mechanisms are arranged at top and bottom, and the brick with the advantages that the dry method building can be adopted, the mortar laying is carried out on the wall surface, the weight is light, the intensity is high, anti-seismic and anti-crack functions and the like can be realized, the secondary decoration of pipe laying and wire passing is convenient, the wall surface peeling is prevented, and the service life is as long as that of a building main body is formed.

The invention discloses a hat with an eyeshade, which comprises a hat body and an eyeshade. The hat body is made up of stretch mesh, and elastic cords are arranged on two sides of the eyeshade and connected to the inner side of the hat body at positions corresponding to a forehead of a human head. Therefore, the hat allows a user to keep the head warm, and the eyeshade can be used for shading light and avoiding interference. The hat body made up of the stretch mesh is highly elastic and capable of constantly maintaining fitting of the hat body with a head. The elastic cords are used for free distance adjustment to guarantee no pressure to ears and the back of the head and avoid strangulation pain and higher comfortableness in long-term wearing of the hat. When not used, the eyeshade can be stored inside the hat body to facilitate storage. The eyeshade is capable of shielding light and avoiding interference, so that an environment suitable for sleep is established, and the user can have a good rest even in daytime or outdoors.

The present invention relates to a functional material and the preparation method thereof, in particular to a BC 3 N crystal body with an orthorhombic structure and the preparation method thereof. The present invention is characterized in that the chemical components of the orthorhombic structure BC 3 N crystal body is B 18 to 20at percent, C 57 to 63at percent and N 18 to 20at percent. The present invention has the preparation method that: a. a powder B-C-N predecessor is prepared; b. the powder B-C-N predecessor is pressed as a disk-like sample (6), to load into a small plumbago crucible (5), and the upper end and the lower end free distances are filled up by a hexagonal boron nitride slice (7); then the small plumbago crucible is orderly put in a pyrophyllite sleeve (3) and a big plumbago crucible (2); at last, the assembled big plumbago crucible (2) is put in a pyrophyllite square block; c. the assembled block is processed under a high temperature of 1400 to 1600 DEG C and a high pressure of 5 to 6 GPa, and the assembled block is cooled to the room temperature after insulating 10 to 60 minutes; d. the gained product is processed chemically, the plumbago and the hexagonal boron nitride are removed, and then a black BC 3 N crystal particle is gained.

Magnetorheological transmission device and method for influencing the coupling intensity of two components, which can be coupled and whose coupling intensity can be influenced. A channel is provided, which contains a magnetorheological medium with magnetically polarizable particles, which can be influenced by a magnetic field. A magnetic field generating unit generates a magnetic field in the channel in order to influence the magnetorheological medium in the channel. A body is disposed in the channel. A free distance between the body and the component is at least ten times greater than a typical mean diameter of the magnetically polarizable particles in the magnetorheological medium. A space with magnetorheological medium is disposed between the body and a component. The magnetic field is applied to the region in order to optionally chain together the particles and / or wedge or release them with the body.