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254results about How to "Reduce density" patented technology

Method for tracking and positioning mobile node of wireless sensor network

The invention relates to a method for tracking and positioning a mobile node of a wireless sensor network, which comprises the following steps: in a measurement positioning period, sending low repeated frequency pulse beacon signals for at least four times at known time intervals by the mobile node approximately keeping uniform speed rectilinear motion, receiving the beacon signals continuously for four times by a main anchoring node, measuring self time difference to acquire three self time difference relation expressions relative to an initial measurement moment, providing two trigonometric function equations from a positioning measurement triangle consisting of a motion locus of the mobile node and a motion radius vector of detection wave by using the cosine theorem, and simultaneously solving the equations so as to determine the relative distance and speed between the mobile node and the anchoring nodes; and further, by adopting the technology of beacon retransmission, retransmitting the beacon signals sent by the mobile node for the last time to the main anchoring node by two auxiliary anchoring nodes so as to achieve asynchronous coordinate positioning of the mobile node. The method can achieve tracking and positioning of a mobile target without time synchronization among the anchoring nodes.
Owner:CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST

Coarse-fraction tailing paste filling method and system

InactiveCN108661703AImprove efficiencyImprove tailings utilizationMaterial fill-upHigh concentrationMaterials science
The invention discloses a coarse-fraction tailing paste filling method and system. The coarse-fraction tailing paste filling method comprises the following steps that (1) coarse-fraction tailing mortar is conveyed to a linear vibrating screen to be screened to obtain coarse sand and low-concentration tailing slurry; (2) the low-concentration tailing slurry is pumped into a deep-cone thickener, a flocculating agent is added, and high-concentration tailing slurry is formed in a base flow; (3) when a sand setting layer in the deep-cone thickener is away from the highest point of the deep-cone thickener by 2 m, the low-concentration tailing slurry is pumped into a tailing pond; (4) the high-concentration tailing slurry is pumped into a sand silo for buffer storage; (5) during filling, the high-concentration tailing slurry, with the concentration reaching the standard, in the step (2) and the high-concentration tailing slurry, with the concentration reaching the standard, in the sand silo in the step (3) are both pumped into a stirring system; cement and water are conveyed into a first-section horizontal-type stirring machine to be sufficiently stirred and mixed with the high-concentration tailing slurry, and filling slurry is obtained; and according to the magnitude of a stowing gradient, the filling slurry automatically flows or is pumped into a down-hole goaf to conducting filling. Operation is reliable, the cost is low, and abrasion is small.
Owner:CHINA MINMETALS CHANGSHA MINING RES INST

Extraction method of heavy fraction of ft synthetic product from slurry bed reactor

The invention provides a method for extracting Fischer-Tropsch synthesis product heavy distillate from a slurry bed reactor, concretely comprising the following steps: in the slurry bed reactor, when a Fischer-Tropsch reaction gas phase stream and a slurry phase stream flow through a metal sintering filter stick arranged in a liquid phase of the slurry bed reactor, the Fischer-Tropsch synthesis heavy distillate and part of catalyst powder can be separated out from the slurry phase of the slurry bed reactor; and the Fischer-Tropsch synthesis heavy distillate and part of catalyst powder are fed into a subsequent solid-liquid separation device for further separating the Fischer-Tropsch synthesis heavy distillate and the catalyst powder, so as to make the obtained Fischer-Tropsch synthesis heavy distillate meet the demand of downstream processing. The method avoids the catalyst particles from being brought out from the top part of the reactor by the gas phase stream and depositing on equipment such as a heat exchanger after being further crushed, and also improves the operational stability of the slurry bed reactor and extends the operation cycle of the apparatus, and can also provide qualified Fischer-Tropsch synthesis product heavy distillate to downstream units.
Owner:CHNA ENERGY INVESTMENT CORP LTD +1

Cylindrical battery and manufacturing method thereof

The invention discloses a cylindrical battery and a manufacturing method thereof, which relate to the field of lithium ion battery manufacturing. The structure is simple. The height of a roll core canbe reduced to a certain extent by arranging a tab on one end surface of the roll core, and meanwhile, only one end of a shell can be opened and sealed, so that the overall weight of the cylindrical battery is reduced; according to the manufacturing method of the cylindrical battery, compared with a pole piece using full tabs in the prior art, the laser cutting of the pole piece is additionally arranged on the process, and through the cooperation of the laser cutting and the subsequent welding and kneading process of the tabs, a positive tab area, a negative tab area and a non-tab area can beformed at one end of a roll core formed by winding a positive plate and a negative plate, and a non-welding area between tabs is omitted, so that the contact compactness between the positive tab and the negative tab after winding is reduced, and the speed of infiltrating the positive plate and the negative plate by electrolyte can be increased during subsequent injection of the electrolyte; and the production efficiency of the cylindrical battery is effectively improved.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY

Audiometry device based on over-sampled multi-frequency multi-amplitude joint estimated auditory evoke potentials

The invention provides an audiometry device based on over-sampled multi-frequency multi-amplitude joint estimated auditory evoke potentials. The audiometry device comprises a device control module, as well as a modulation sound generation device, a data acquisition device and a data processing and analysis module, which are connected with the device control module respectively. The device has thefollowing advantages and technical effects: 22 modulation sounds with different modulation frequencies and carrier frequencies can be utilized to simultaneously simulate the human ears and simultaneously evoke multiple ASSRs (auditory steady-state evoke responses); the frequency spectrum estimation algorithm of multi-frequency multi-amplitude joint estimation is adopted for estimating the amplitudes of the modulation signals in the auditory evoked potentials, thereby estimating the response of a carrier signal corresponding to each modulation signal and fitting auditory frequency response curves at all levels according to all groups of amplitude responses; the audiometry device can carry out frequency spectrum estimation in the environment with low signal-to-noise ratio, has very high frequency spectrum resolution and can realize simultaneous detection of sound frequency responses of at most 22 frequencies of an auditory system; and the detection time is further greatly shortened.
Owner:SOUTH CHINA UNIV OF TECH
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