90results about How to "Little external influence" patented technology

The invention discloses a microwave network channel accessing method based on a narrowband wave beam directional antenna. The method comprises the following steps of accessing a superframe structure multi-hop Ad Hoc network by a network main station, using the multi-hop Ad Hoc network operation time as a reference, and transmitting a synchronizing signal; capturing the synchronizing signal by other network nodes; if capturing succeeds, acquiring unidirectional synchronization; transmitting a broadcast signal according to an MAC address by means of a broadcast signaling time slot, performing searching on other network node broadcast signaling time slots, and establishing a neighboring link relation; performing distance measuring and performing path transmission time delay correction; performing neighbor discovering and antenna adjustment, and obtaining an optimal transmitting and receiving antenna; randomly accessing a time slot A by a sub-frequency channel, and accessing a small time slot by the channel of each time slot; and in a period, accessing the small time slot by M channels, and performing average distribution according to the MAC address. The microwave network channel accessing method is based on the microwave network and the distributed narrowband wave beam direction antenna and has advantages of realizing reliable and stable transmission in a high-mobility scene, quick real-time adjustment of the directional antenna, and effectively improving comprehensive communication performance of the network.

The invention discloses a 3D packaging structure based multifunctional phased array TR chip. A chip RF part with a high-performance gallium arsenide chip comprises four identical single channels, namely, first to fourth channels CH1, CH2, CH3 and CH4, the four single channels are connected with four ports of a one-to-four power divider respectively, and each channel comprises a six-bit digital control attenuator ATT, a six-bit digital control phase shifter PHS, a low noise amplifier LNA, a driving amplifier DRV1, a driving amplifier DRV2, a power amplifier PA, a single-pole three-throw switchSP3T and a limiter Limiter; and a CMOS chip services as a control circuit of the multifunctional chip for chip logic control, and the CMOS chip and the gallium arsenide multifunctional chip are arranged in a flip way to form the integrated 3D packaging structure. The 3D packaging structure based multifunctional phased array TR chip has the advantages of small size, low cost, high consistency, highreliability and simple debugging.

The invention relates to a DWT-DCT (Discrete Wavelet Transform-Discrete Cosine Transform) and Logistic Map-based medical image robust watermarking method, which belongs to the field of multimedia signal processing. The method comprises preprocessing of a watermark and embedding of the watermark, wherein the preprocessing of the watermark and embedding of the watermark comprise the following steps of: (1) obtaining an encryption matrix by using a Logistic Map; (2) obtaining an encrypted watermark; (3) performing DWT on an original image, performing DCT on an approximation sub-image and extracting the vector of a characteristic; (4) obtaining a corresponding two-valued logic sequence by using the characteristic vector and chaotically encrypted watermark, storing the two-valued sequence at a third party, and then extracting and reducing the watermark, wherein the extraction and the reduction of the watermark comprise the following steps of: (5) performing operation similar to the step (3) on an image to be tested to solve one characteristic vector; (6) extracting the encrypted watermark; (7) generating a two-valued encryption matrix by using the Logistic Map; and (8) solving the reduced watermark. According to the method, the secrecy of information of a patient can be protected.

The invention provides an unmanned aerial vehicle communication base station, a communication system, an establishment method of the communication system and an unmanned aerial vehicle communication base station, the unmanned aerial vehicle communication base station comprises a multi-rotor unmanned aerial vehicle, base station equipment, a base station antenna and a main control unit, and the base station equipment and the base station antenna are mutually connected and arranged on the multi-rotor unmanned aerial vehicle; the main control unit is connected with each driving motor, the base station equipment and the base station antenna; wherein the base station equipment transmits a radio frequency signal to the ground communication base station through the base station antenna so as to establish communication connection with the ground communication base station, and the main control unit is used for controlling the flight state of the multi-rotor unmanned aerial vehicle and the communication process of the base station equipment and the ground communication base station. The load requirement of the communication base station can be met, the communication network is less influenced by the outside, the communication quality is higher, and the maneuverability and the adaptability are stronger. The problem that a carrier platform adopted by a high-altitude communication base station in the prior art is difficult to adapt to high-altitude wireless communication and thus the application range is limited is solved.

The invention discloses a low-temperature storage transfer device and an operation method thereof. The low-temperature storage transfer device is used for conveying a transfer pot from the external environment to a refrigeration house and comprises a sealing component and a transmission component, wherein the sealing component comprises an inner door and an outer door; the inner door is provided with an inner lifting mechanism, the outer door is provided with an outer lifting mechanism, and a sealable buffer area is formed between the inner door and the outer door; the inner door is communicated with the refrigeration house, and the outer door is communicated with the external environment; the transmission component comprises an outer transmission mechanism and an inner transmission mechanism; the outer transmission mechanism is used for conveying the transfer pot from the external environment to the buffer area, and the inner transmission mechanism is used for conveying the transfer pot from buffer area to the refrigeration house. The low-temperature storage transfer device can ensure that a biological sample cannot be exposed in the normal-temperature environment after the transfer pot is uncapped, thereby reducing sample damage. The buffer area can prevent the inner part of the transfer pot from frosting, and the success rate of automatically storing and taking pipes is increased.

The invention provides a method for analyzing the magnetic roasting effects of an iron ore having different granularity ranges. The method mainly comprises the following technological steps: 1, preparing an experiment ore sample and a reduction coal sample; 2, drying the ore sample; 3, uniformly spreading the ore sample and the coal sample on a clean roasting porcelain dish, sending to a box type electric resistance furnace, and carrying out magnetic roasting to obtain a roasted ore; 4, rapidly taking out the roasted ore, and carrying out water quenching cooling; 5, filtering the roasted ore obtained after the water quenching cooling; 6, drying the filtered roasted ore sample; 7, screening the dried roasted ore by grid sieves to form roasted ores respectively having granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm, and respectively weighing; 8, grinding the roasted ores respectively having granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm to 1-60 meshes; and 9, carrying out magnetic separation of the roasted ores respectively having granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm. The experiment method has the advantages of high accuracy and few extraneous influence factors, and provides a basis for the selection of roasting conditions during the sieve fraction magnetic roasting of difficult-separation iron ores.

The invention discloses a tea polyphenol composite coating preservative and a preparation method thereof. The composite coating preservative is prepared from the following raw materials according to mass concentration: 2.5-5.5% of collagen, 0.5-3.5% of glycerol, 0.5-4.5% of gelatin, 0.1-1% of tea polyphenol, and deionized water. According to the preparation method, tea polyphenol, collagen, gelatin, and glycerol are used as main raw materials to prepare the composite coating preservative, and then the preservative is spread on hawthorn fruits. After 20 day's storage at room temperature, researchers research changes of hardness, vitamin C, sensory quality, weight loss rate and other indexes of hawthorn fruits, so as to evaluate the preservation effect of the composite coating preservative on hawthorn fruits. The hawthorn fruit treated by the coating preservative changes more slowly in weight loss rate, sensory quality, hardness and vitamin C than the hawthorn fruit not spread with the coating preservative. The preservative effectively prolongs the shelf life of the hawthorn fruits. The coating preservative with best preservation effect is prepared from the following raw materials: 4.0% of collagen, 3.0% of gelatin, 0.2% of tea polyphenol, and 1.0% of glycerol.

To enable mounting of a canister on a vehicle body in a compact manner while favorably ensuring the charge performance and the purge performance of the canister in the arrangement structure of an evaporated fuel treatment device of a saddle-ride-type vehicle. An under cowl (26) is provided at a front side of a lower portion of an engine (14), and a canister (41) is arranged below the engine (14) and inside the under cowl (26).

The invention discloses a curve PC track beam prefabrication construction method. The curve PC track beam prefabrication construction method comprises the operations of steel bar cage binding, template adjusting, steel bar cage placing, concrete pouring and demolding. According to the curve PC track beam prefabrication construction method, a steel cage prefabrication and suspension line positioning device is adopted to assist side template measurement positioning and side template automatic adjustment, the disadvantage of low manual template adjustment efficiency in traditional track beam prefabrication is broken, the automation degree of a template system is improved, and the quantity of operators is reduced.

The invention discloses a robust watermarking technology for medical images on the basis of Arnold scrambling transformation and DWT (discrete wavelet transform)-DFT (discrete Fourier transform), and belongs to the field of multimedia signal processing. The robust watermarking technology includes embedding watermarks and then extracting the watermarks, and particularly includes steps of (1), performing Arnold transformation for watermarks to be embedded; (2), performing DWT for a medical image, performing DFT for approximation sub-images of the medical image, and extracting vectors of a feature; (3), generating a binary logic sequence via a Hash function by the vectors of the feature and the preprocessed watermarks so as to complete the process for embedding the watermarks; (4), performing DWT for a medical image to be measured, performing DFT for approximation sub-images of the medical image to be measured and extracting vectors of a feature; (5), extracting watermarks by the aid of the Hash function and a binary logic sequence stored in a third party; and (6), obtaining the original watermarks via Arnold inverse transformation so as to complete the process for extracting the watermarks. The robot watermarking technology has an important significance in protecting information of patients during remote medical treatment.

The invention discloses a direct acting fuel oil metering device. The direct acting fuel oil metering device comprises a pipeline conveying system, a high-temperature type oval gear flowmeter system, an equivalent valve metering system and a direct constant pressure difference valve control system. The direct acting fuel oil metering device is simple in structure, obvious in effect and high in reliability. The high-temperature type oval gear flowmeter system is adopted, the control precision is high, and the device is hardly influenced by outside influential factors. The spherical equivalent valve metering system and the direct constant pressure difference valve control system are adopted to cooperatively control the oil pressure and the flow rate of fuel oil. A fuel oil flow control mode is adopted, and the constant pressure difference effect is achieved mainly on the basis of adjusting the opening degree of an oil return window of the direct constant pressure difference valve control system to convey surplus oil flow output by a fuel oil pump back to an inlet of the pump. No amplifier element is arranged, and a constant pressure difference valve doubles as a metering element and an actuating element, so that the steady state error is large, however, the device is simple in structure and high in reliability, and the direct acting fuel oil metering device can be widely applied to aircraft engines of which the required accuracy is not high.

The invention relates to a method for chemically analyzing the content of boron nitride in a nickel-based powder material. The method comprises the steps: separating boron nitride, which is insoluble in acid, in a nickel-based composite spraying material by adopting mixed acid, fusing a boron nitride precipitate by adopting anhydrous sodium carbonate to obtain water-soluble sodium borate, determining emission strength of boron under the working condition of an inductively coupled plasma (ICP) emission spectrometer, and converting the emission strength into the content of boron nitride in a sample. According to the method for chemically analyzing the content of boron nitride in the nickel-based powder material, boron nitride is converted into water-soluble sodium borate by adopting anhydrous sodium carbonate through fusion, the content of boron nitride in the nickel-based composite spraying material is determined by virtue of the plasma atomic emission spectrometer, insoluble boron nitride is converted into soluble borate, and thus the defects of complexity in operation and long consumed time when boron nitride is determined by adopting a volumetric method are prevented; and the method has the advantages of being accurate to analyze and simple and convenient to operate.

The invention provides a tunnel environment mechanical arm real-time collision early warning system and method.The tunnel environment mechanical arm real-time collision early warning method comprises the steps that firstly, tunnel three-dimensional space positioning information and tunnel circumferential contour surface information are obtained through a positioning system and a digital tunnel design module, and then joint variables when a mechanical arm reaches an expected pose are obtained through calculation of an inverse kinematics module; then, real-time poses of all joints of the mechanical arm relative to a reference coordinate system are obtained through calculation of a forward kinematics module, and then in a collision detection and early warning module, a model is established, and all parameters are set; a hierarchical bounding box detection algorithm and a separation axis theorem are adopted to realize collision detection and multi-level early warning between the mechanical arms, between the mechanical arms and a hydraulic pipeline and between the mechanical arms and a tunnel environment, and finally an alarm module receives an early warning instruction and sends an early warning signal to the outside. The method is suitable for real-time collision early warning of engineering equipment, the detection precision is high, the consideration condition is comprehensive, and safe and efficient operation in the tunnel construction process can be achieved.

The invention relates to an object existence detection device and method. The device comprises a UWB transceiver which comprises a transmitting end and a receiving end and is used for transmitting and receiving UWB pulse signals; a time recording unit which is used for recording the time duration from the time when the UWB transceiver transmits the preset pulse signals to the time when the pulse signals are reflected back and received by the UWB transceiver, wherein if no object exists, the receiving end receives multiple UWB pulse signals reflected through multiple paths of the surrounding environment and flying time of the UWB pulses through the shortest multipath reflection path is recorded as Tm, and if the detection result indicates existence of objects, the UWB pulse signals transmitted by the UWB transceiver return to the receiving end of the UWB transceiver, and flying time of the UWB pulses through the shortest reflection path is recorded as Tn; and a judgment unit which is used for comparing Tn and Tm, wherein if Tn<Tm, there are objects existing near the UWB transceiver through judgment, or there is no object existing near the UWB transceiver.

The invention provides a basic tracking measurement method for rolling lines. The basic tracking measurement method comprises the following steps: selecting two points as a rear view point and a station point on an original rolling line; selecting at least two points except the rear view point and the station point on the original rolling line as prediction points; placing an instrument at the station point, and implementing multiple times of measurement at the rear view point, thereby confirming positions of different prediction points relative to the original rolling line after being stabilized. According to the basic tracking measurement method for rolling lines, the prediction points are directly tested and compared by using the instrument at the station point, then the position of the prediction point relative to the original rolling line is confirmed, basic displacement of the rolling line is tracked and tested, the testing method is simple, external influence factors in the testing process are reduced, and errors caused by different station points are reduced as the station point of the instrument does not need to be changed for multiple times, and therefore, the method is precise and reliable in adjustment in the adjustment process, and the precision of basic measurement of the rolling line is improved.

The invention provides a manufacturing method for nanowire films/bodies accumulated in order. The manufacturing method for the nanowire films/bodies accumulated in order comprises the steps of preparing nanowires manufactured in advance; suspending the nanowires in a solvent to form even turbid liquid; filling the turbid liquid in a centrifugal tube; carrying out high-speed centrifugation sedimentation on the turbid liquid, wherein all the nanowires are precipitated on the bottom of the tube, and nanowire sedimentation accumulated in order is formed; removing liquid supernatant, the nanowire sedimentation accumulated in order is dried and separated from the bottom of the centrifugal tube, and the manufacturing of the nanowire films/bodies accumulated in order is completed. According to the manufacturing method for the nanowire films/bodies accumulated in order, dense nanometer materials can be obtained without growth of a seed layer, and the method is free of limitation of materials and preparation methods.

The invention provides an intelligent anti-theft alarm transformer and a distribution transformer system. The intelligent anti-theft alarm transformer comprises a transformer body and an anti-theft alarm device, wherein the transformer body comprises a transformer oil tank, and the anti-theft alarm device comprises an alarm unit for giving alarm information and a receiving alarm unit for receiving the alarm information, wherein the alarm unit is arranged inside the transformer oil tank. The intelligent anti-theft alarm transformer has the advantages of being high in safety, large in destructive resistance and good in installation hiding performance, being less affected by the outside and the like.

The invention relates to a device for contactless distance and/or position determination of a measurement object (1), comprising an electrically conductive measurement object (1) and a sensor (3) which is operated in particular according to the inductive, capacitive or eddy current principle, the sensor (3) comprising a measuring device (4). The invention is characterized in that the measuring device (4) is formed by at least two spatially separated measurement elements (5, 5', 5''). The invention further relates to a corresponding sensor (3).

The present invention provides a low-odor fast UV-LED ultraviolet cross-linked polyethylene insulation material, comprising following components shown in the specification by weight. The cross-linkedpolyethylene insulation material crosslinked by UV-LED ultraviolet radiation of a system of a novel photoinitiator and blended resin is provided. The material has characteristics of no flammable and explosive additives, low odor, low smoke, fast cross-linking, and the like, and is used for the insulation of low-voltage power cables and photoelectric composite cables.

The invention discloses a pyroelectric infrared scene-change-induction lighting control system and a method thereof. The system comprises a sampling control unit, a photosensitive element, a pyroelectric infrared induction sampling element, a power supply circuit, a cold white light emitting diode, a warm white light emitting diode, a red light emitting diode, a green light emitting diode, and a yellow light emitting diode. The sampling control unit includes a processor, a first duty ratio output unit, a second duty ratio output unit, a third duty ratio output unit, a fourth duty ratio output unit, a fifth duty ratio output unit, an anti-jamming filtering processing unit, and an average-mean filtering algorithm unit. Through the pyroelectric infrared scene-change-induction lighting control system and the method thereof, lighting scene change is realized. The system and the method have the advantages of simple circuit, high detection precision, high reliability, small external influence, and strong practicability.