31results about How to "Density Requirements Reduced" patented technology

The invention discloses a multi-section water cup, the cup body comprises an upper cup body and a lower cup body, the upper cup body is in threaded connection with the lower cup body, a cup cover is arranged on the upper cup body, the size of an opening in the connecting position of the upper cup body and the cup cover is smaller than that of an opening in the connecting position of the lower cup body and the upper cup body, and a buoyancy push rod is arranged on the inner side wall of the upper cup body, the buoyancy push rod comprises a floating section and a sinking section, the joint of the floating section and the sinking section is rotationally connected with the upper cup body, a clamping protrusion is arranged on the sinking section, and a second clamping groove matched with the clamping protrusion is formed in the inner side wall of the lower cup body; when the floating section floats, the clamping protrusion on the sinking section is clamped into the second clamping groove. According to the multi-section water cup, the structure is simple, the upper cup body and the lower cup body are detachably connected, when the liquid level in the cup is higher than the connecting position of the upper cup body and the lower cup body, connection of the upper cup body and the lower cup body can be automatically locked, and the situation that liquid is scattered due to mistaken opening is avoided.

The invention discloses an automatic calibration method and device of laser radar parameters and a laser radar. The method comprises the steps of (10) setting a first marker with a first marking point in a calibration field, using the laser radar to carry out laser scanning on the calibration field and obtaining scanning data, (20) fitting the scanning data of a position where the first marker is located, and obtaining the fitting space coordinate of the first marking point, and (30) calculating the laser radar parameters by using an error between the fitting space coordinate and the measurement space coordinate of the first marking point, and carrying out the automatic calibration by using the calculated laser radar parameters. According to the method, device and the laser radar, the fully automatic high precision calibration of the laser radar is realized, the density requirement of a laser point is low, the integrity requirement of marker scanning is low, and the automatic precision inspection and evaluation of calibrated laser radar measurement precision can be carried out.

The invention provides a flow cell stack, comprising two endplates, a diaphragm, and two bipolar plates, the flow cell stack is separated into an anode electrolyte area and a cathode electrolyte areathrough the diaphragm between the two endplates, each area is provided with a bipolar plate which has the same polarity with the electrolyte of the corresponding area and the same polarity at both sides; two poles of the same bipolar plate are connected in parallel; an inlet of each bipolar plate is arranged at the same position below the bipolar plate, and an outlet of each bipolar plate is arranged at the same position above the bipolar plate. The flow cell stack is simple in structure, can reduce the requirement on the performance of the material of the bipolar plate effectively, particularly the requirement on the compactness of the bipolar plate so as to reduce the production cost effectively; meanwhile, the flow cell stack can effectively decrease the self-discharging and reduction of efficiency of the cell caused by the crossing between the anode electrolyte and the cathode electrolyte in the cell stack and prolong the service life of the cell, is suitable to be an update of theprior flow cell stack, particularly to be used on a cell stack which needs large current discharging.

The invention relates to a locating method of a wireless sensor network based on an RSSI (Received Signal Strength Indicator), which belongs to the technical field of wireless sensor networks and comprises the following steps of: respectively measuring the RSSI values of anchor nodes and a blind node to obtain the information on the distance between the blind node and each anchor node; selecting three anchor nodes nearest to the blind node as reference nodes to perform rough locating to obtain the rough locating position of the blind node; establishing a distribution probability model of the blind node to obtain the distribution probability of the blind node in each position of the wireless sensor network; performing locating searching processing by using the rough locating position of the blind node as an initial position and L1 as step length to obtain the first locating position of the blind node; and performing locating searching by using the (N-1)th locating position as an initial position and L(N) as step length to obtain the Nth locating position of the blind node, i.e. the finial position of the blind node. The invention has low requirements for node density, no environmental interference, great improvement on locating accuracy and low locating error reduced to be between 20% and 50%.

The invention discloses a wireless sensor network positioning method based on unit grids, and the method is used for estimating the location of an undetermined location node through the intersection of a plurality of coverage areas based on the constraint from anchor nodes in a unit grid model to the communication coverage range thereof. A location constraint relationship also exists between nodes, the anchor node beacon information of which is not detected and received, and the anchor nodes, namely in the complementary set of the anchor node communication coverage range. The invention improves the location estimating precision, especially the precision and the algorithm coverage capacity of the sparse node location. The calculating and communicating expenses of the locating process are greatly reduced, and the requirements to the anchor node density are decreased; and the calculating complexity of each node is independent of the network scale and has strong anti-interference ability and certain application value, thereby effectively satisfying the requirements to the high-precision distributed location of the wireless sensor network.

The invention discloses an indoor wireless positioning method by utilizing fingerprint technique. The indoor wireless positioning method by utilizing the fingerprint technique largely lowers the requirements for the density of sampling points, enriches distribution information of signal strength, lightens the workload, and keeps high-precision positioning results. The indoor wireless positioning method by utilizing the fingerprint technique comprises an off-line training phase and an on-line training phase. The off-line training phase includes the following steps: firstly, an indoor environment is set up and signal strength data are acquired; secondly, an original fingerprint database with a low sampling rate is constructed; and thirdly, the original fingerprint database is reconstructed through a low-order matrix fill model, the low-order matrix fill model is minrank (X) s.t.A(X) = B. In the on-line training phase, signal strength vectors used for testing and the signal strength vector of each sampling point in the reconstructed fingerprint database are compared and matched, and position coordinates of a present position are estimated by utilizing the point coordinates of the known sampling points to obtain on-line positioning coordinates.

The invention relates to a sequence-based sensor node positioning method and device, comprising the following steps: the sensor node to be positioned collects signal strength indication values ​​of multiple beacon nodes within the communication range; according to the coordinate position and communication range of each beacon node Carry out area division, sort the signal strength in each area to obtain multiple signature sequences; match and calculate multiple detection sequences with the signature sequence table; the sensor node to be located collects the coordinate position of the beacon node outside the range of one hop and the coordinate positions of the quasi-beacon nodes that have been located; draw vertical bisectors between all beacon nodes and all quasi-beacon nodes outside the range of one hop and each beacon node within the range of one hop in order to obtain the final The area to be located; the centroid of the final area to be located is taken as the coordinate position of the sensor node to be located. The invention has good robustness and higher matching precision, and reduces the requirement on the density of beacon nodes.

The invention provides a composite foaming agent particle, which includes a titanium hydride phase and a metal phase, the metal phase covers the titanium hydride phase, and the melting point of the metal phase is lower than the decomposition temperature of the titanium hydride. The present invention also provides a method for preparing composite blowing agent particles, comprising mixing titanium hydride particles and metal particles to obtain mixed particles, the melting point of the metal particles being lower than the decomposition temperature of the titanium hydride; Apply pressure to the particles to make the metal particles and the titanium hydride particles composite to form a block composite; mechanically crush the block composite to obtain composite particles; and perform particle size screening on the composite particles to screen out The metal phase coats the composite particles of the titanium hydride phase. The invention also provides a preparation method of foamed aluminum.

The invention provides a high-energy X-ray industrial CT ionization detector, which can overcome the defects of scintillator detectors and is suitable for radiation detection of a high-energy X-ray industrial CT system. The detector comprises seal housing which is filled with working gases and is provided with a plurality of ionization chamber units; the ionization chamber unit is elongated and comprises a U-shaped ionization chamber wall and a latten; a receiving terminal of the X-ray on the latten is fixedly arranged at an open end of the U-shaped ionization chamber wall via an insulation sheet; the other end of the latten is arranged in the ionization chamber and spread along the length direction of the ionization chamber; the latten, with thickness less than or equal to 0.3mm, is manufactured by high-density metals with high atomic number or the alloy of the metals; a coat on which secondary electrons are easily generated covers the external surface of the latten; the U-shaped ionization chamber wall is connected with a signal processing circuit as a collector; the latten is connected with a high-voltage cathode and a high-voltage power supply as a radiation converter.

The invention discloses a method for increasing the density of parallel arrays of carbon nanotubes by means of the Poisson's ratio of an elastic material. First, the parallel array of carbon nanotubes grown on the substrate is transferred to elastic materials, such as polymethyl methacrylate, silicone rubber or polyester, and other elastic materials; then stretch the carbon nanotubes along the direction of extension. The elastic material makes it shrink in the direction perpendicular to the extension of carbon nanotubes, thereby obtaining high-density carbon nanotubes; finally, the parallel array of carbon nanotubes on the film is transferred to the target substrate. The method of the invention is simple and practical, high in efficiency and low in cost, and can produce high-density and high-quality parallel arrays of pure semiconductor carbon nanotubes.