48results about How to "Small transmission power" patented technology

A method of allocating a channel in a wireless local area network (WLAN) system is provided. The method includes generating a MAC protocol data unit (MPDU) to be transmitted to a target station (STA), generating a PLCP protocol data unit (PPDU) by attaching a physical layer convergence procedure (PLCP) header to the MPDU, and transmitting the PPDU to the STA, wherein the PLCP header includes channel allocation information for transmission of the PPDU.

A slot antenna includes an insulation substrate, a metal layer provided on the insulation substrate, a slot formed in the metal layer, and a feeding part connected to the metal layer. The slot is symmetric with respect to a centerline. When an x-y coordinate system is defined on the metal layer so that the y-axis is the symmetric line, the origin is the center of the slot antenna, and the x-axis through the origin is perpendicular to the y-axis, the width of the slot in the direction of the y-axis increasing in proportion to the absolute value of the x-axis.

The invention relates to a high-efficiency energy-saving threshing air separation new process and equipment, and particularly relates to a threshing redrying process which carries out air separation on tobacco flakes and tobacco stalks and belongs to a tobacco processing industry and the technical field of equipment. The threshing redrying process sequentially comprises the following steps of: a scraping plate feeding machine, a bin type feeding machine, a proportional distributor, a first-level threshing machine set, a conveying belt, a first-level air separation machine set (double-bin air separator), a stalky leaf conveying belt, a second-level threshing machine set, the conveying belt, a second-level air separation machine set (three-bin air separator), the stalky leaf conveying belt, a third-level threshing machine set, the conveying belt, a third-level air separation machine set (three-bin air separator), the stalky leaf conveying belt, a fourth-level threshing machine set, the conveying belt and a fourth-level air separation machine set (three-bin air separator), wherein the first-level air separation machine set is provided with an air pressure type double-bin air separator which only separates qualified tobacco flakes; and the second-level air separation machine set, the third-level air separation machine set and the fourth-level air separation machine set are provided with air pressure type three-bin air separators which can separate qualified tobacco flakes and tobacco stalks.

A transmitter for transmitting signals to targets and a receiver for receiving signals reflected from targets are included. The transmitter outputs CW signals for detecting direction and velocity of the target. The receiver performs: a function of receiving signals reflected from targets with a plurality of receiving antennas at the same time as transmitting from the transmitter, and performing spectral analysis with respect to receiving signals to thereby classify them by velocity component; a function of correlating signals of the receiving antenna systems; a function of integrating the signals correlation-processed; and a function of obtaining phase fronts of signals made incident on an antenna face from the phase differences of signals between receiving antennas, and performing two-dimensional FFT to the outputs to thereby measure the direction and velocity of the target.

A lifting device is composed of a lifting platform, a counterweight, a set of symmetrically arranged lifting platform transmission devices, a toothed belt transmission device arranged on the lifting platform, and a hanging spindle for hoisting empty and full pipes. The lifting platform transmission device and the toothed belt transmission device are respectively driven by motors; the lifting platform is composed of a lifting arm and a set of transverse rails installed by the lifting arm. Compared with the existing technology, the structure is simpler and the operation is more reliable; the problem of counterweight balance between the lifting platform and the full pipe is solved; the transmission power is reduced; the load and wear of the transmission parts are reduced; the level adjustment element is set to adjust the lifting platform The levelness; improve the operational reliability of the unit, and can also realize the lifting and the exchange of empty and full pipes according to the requirements of displacement and displacement speed.

A device for continuous carbon felt impregnation comprises a frame, a carrier shaft, a feed roll shaft, an impregnation tank and a discharge roll shaft, wherein the carrier shaft, the feed roll shaft, the impregnation tank and the discharge roll shaft are sequentially arranged on the frame. A drive motor is arranged between the feed roll shaft and the discharge roll shaft, the drive motor is respectively connected with the feed roll shaft and the discharge roll shaft through a transmission device, impregnation roll shaft brackets are disposed inside two ends of the impregnation tank respectively, an impregnation roll shaft is arranged on the impregnation roll shaft brackets, and a slanting guide board is disposed below the discharge roll shaft and connected with the impregnation tank. Thedevice can be used for continuous, mechanical and automatic impregnation for carbon felts, labor intensity can be reduced greatly, impregnation efficiency can be improved, and product quality stability can be improved.

The invention relates to a method for operating a fuel pump in order to guide fuel from the fuel container of an internal combustion engine, wherein the electric energy, which is in the form of pulses, is periodically guided to the fuel pump and the duration of the pulses is controlled according to the fuel required by the internal combustion engine. The frequency of the pulses is controlled in such a manner that, in the event of low pump capacity of the fuel pump, the frequency is controlled to a higher level than in the even of a high pump capacity.

The invention relates to an energy-efficient threshing and pneumatic separating process and device. The energy-efficient threshing and pneumatic separating process is characterized in that a two-bin pneumatic separator is adopted for a first stage pneumatic separating unit; three-bin pneumatic separators are adopted for a second stage pneumatic separating unit, a third stage pneumatic separating unit and a fourth stage pneumatic separating unit; and the strips yield of the first stage pneumatic separating unit, the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit is respectively 45-64%, 15-30%, 10-15% and 5-15%. The strips yield is decreased gradually so that the device dimensions and capacities of the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit are decreased gradually, and the physical dimension of the fourth stage pneumatic separating unit is 1 / 2 that of the first stage pneumatic separating unit. The purpose of separating qualified tobacco flakes and tobacco stalks is achieved through the technological process, adjustment of the pressure balancing surface position in separation bins of the two-bin pneumatic separator and each three-bin pneumatic separator of the first to fourth stage pneumatic separating units and speed adjustment of a conveying mesh belt.