38results about How to "Eliminate peaks" patented technology

System and method for preprocessing a signal for transmission by a power amplifier. In a preferred embodiment a multiple input multiple output processor is coupled to a plurality of power amplifiers for transmitting a signal, where the number of power amplifiers exceeds the number of antennas. The multiple input multiple output processor performs an algorithm to optimize the output vector ensuring that the transmit power for any one amplifier is below a predetermined threshold. In a preferred embodiment a Remez optimization algorithm is performed. Alternative optimization algorithms may be used. In a preferred embodiment the processor is a single integrated circuit. A method is disclosed where a multiple output vector is produced for transmission, using an optimization algorithm to produce an output vector that ensures that for any of the power amplifiers, the transmit power is maintained below a predetermined threshold.

Disclosed is a three-dimensional (3D) mesh compression apparatus and method. The 3D mesh compression apparatus may generate a base mesh through a mesh simplification, may separately compress the base mesh and peaks eliminated by the simplification, may construct a covariance matrix based on a topological distance between the eliminated peaks, and may compress 3D mesh data based on the covariance matrix.

The invention provides a timing synchronization method in a low-orbit satellite communication system. The timing synchronization method is characterized by comprising the following steps: selecting longest linear feedback shift register sequences to construct a training symbol, wherein the training symbol has two front and back reverse parts, the total length is N, the front half part N/2 is reverse to the back half part N/2, and meanwhile two parts N/4 in each N/2 part form conjugate antisymmetry; further improving a time domain structure of the training symbol, so that the time domain structure becomes a dual conjugate antisymmetry structure; and calculating the improved training symbol according to a timing synchronization measurement function to obtain a time domain measurement result. By adoption of the method, related peak values of timing positions can be eliminated, no platform effect is generated, and meanwhile the sidelobe phenomenon is also well inhibited.

The present invention adds gain and phase into a canonical second order system in order to mitigate the adverse effects of unwanted resonance, where the gain is added to the forward path of a control loop of the system and is a ratio of the square of the system and mechanism frequencies, and the phase lead (H-factor) is added to the feedback path of the control loop of the system and is a complex ratio of these frequencies which includes a dc-component (H_dc) and a zero- or pole-component. By adding gain and phase lead, which is contrary to current approaches to addressing resonance, the present invention achieves the desired result of resonant free application in a canonical resonant-prone system of second order, and the methodology is applicable to higher order systems.

The invention discloses a preparation method of a graphene low-temperature battery. The preparation method is applied to batteries of lithium titanate negative pole systems. An existing rechargeable battery only can be charged to 50-70% the total battery capacity in a low-temperature environment. The preparation method includes the steps that slurry needed for coating a battery positive pole plate is prepared from a lithium manganate positive electrode, a binding agent and a conductive agent; homogenate of slurry needed for coating a battery negative pole plate is prepared from a conductive agent containing conductive graphene slurry; coating of the battery positive pole and the battery negative pole is carried out, and blank foil is reserved on the upper and lower sides of the positive pole and the negative pole; rolling and cutting of the battery positive pole plate and the battery negative pole plate are carried out; battery assembling is carried out; battery formation and aftertreatment are carried out. The preparation method has the advantages that the battery can be charged to 90% the total battery capacity within 6 min in an environment where the temperature is -40 DEG C, and meanwhile the battery has super-high cycle performance and low internal resistance.

The invention discloses a load sensitive hydraulic control system, comprising a multipath directional control valve and a load sensitive pump having a load sensitive valve, wherein, a liquid inlet and an oil drain port of the multipath directional control valve are respectively communicated with a liquid outlet and an oil tank of the load sensitive pump, a load feedback port of the multipath directional control valve is communicated with a sensitive cavity of the load sensitive valve, and each uniting valve oil port of the multipath directional control valve is respectively connected with the corresponding executive component; the passage between the load feedback port of the multipath directional control valve and the sensitive cavity of the load sensitive valve is provided with a damper valve; the oil duct between an oil inlet and an oil outlet of the damper valve is provided with at least two dampings, and the oil duct between the adjacent two dampings is provided with a chamber having an enlarged cross section; and the oil outlet is communicated with the load feedback port of the multipath directional control valve, and the oil inlet is communicated with the sensitive cavity of the load sensitive valve. In addition, the invention provides a crane having the load sensitive hydraulic control system.

The invention relates to an automobile constant speed driving shaft. The automobile constant speed driving shaft comprises a left half axle and a right half axle, wherein the left end of the left half axle is assembled with a left side wheel through a left half axle fixed knot, the right end of the left half axle is assembled with a left side half axle gear of a differential mechanism in a power transmission device through a left half axle moving knot, the left end of the right half axle is assembled with a right side half axle gear of the differential mechanism in the power transmission device through a right half axle moving knot, the right end of the right half axle is assembled with a right side wheel through a right half axle fixed knot, the right half axle is of a hollow axle tube structure, the left half axle is of a solid rod axle structure, the length of the right half axle hollow axle tube is X, the length of the left half axle solid rod axle is Y, X is greater than Y, the torsion rigidity of the right half axle is K right, the torsion rigidity of the left half axle is K left, and the K right is equal to the K left. The automobile constant speed driving shaft not only solves the off-tracking problem during dynamic load acceleration running of the whole vehicle caused by inconsistent torsion angles of the left half axle and the right half axle, but also eliminates resonance phenomenon caused by different rotating speed working conditions of the engine, so that the NVH (Noise Vibration and Harshness) performances and economical performance of the vehicle are improved.

The harmful effects of tracking are reduced for a drill bit having roller cones with at least one of the outermost rows of active teeth containing one or more teeth having a height that does not extend to the height of at least one of the outermost rows on another roller cone on the bit. The crest on this tooth may have a length in a circumferential direction that is wider than an overall width of the tooth in the outer to inner direction. The invention may be used on any cutter row, not just the outermost row. The design may be used on a different roller cone or row, or more than one cutter row. The anti-tracking feature may be located between the leading and trailing edges of the tooth on one or more roller cones.

The invention discloses a reversely-rotating trowelling roller for a coated battery diaphragm output of a drying oven. The reversely-rotating trowelling roller comprises the drying oven, a coating mechanism arranged on the front side of the drying oven, a reverse trowelling mechanism installed on the back side of the drying oven and a take-up mechanism arranged on the back side of the reverse trowelling mechanism. A transmission belt is installed in the drying oven. A film is placed on the transmission belt. The reverse trowelling mechanism sequentially comprises a stainless steel roller guide roller, a first stainless steel guide roller group, a ceramic trowelling roller, a second stainless steel guide roller group and a rubber compression roller from front to back. According to the reversely-rotating trowelling roller for the coated battery diaphragm output of the drying oven, the ceramic trowelling roller is driven to rotate through a motor, the rotating direction of the ceramic trowelling roller is opposite to the motion direction of the film, a coating with undried glue is trowelled by utilizing rolling friction produced through relative motion, the film is not damaged, and the uniformity of the coating coated on the film can be ensured.

Preparation method of graphene fast charging battery. The invention is used in batteries. Existing rechargeable batteries can only reach 50‑70% of the total battery capacity when charged in a low temperature environment. The invention includes: preparing the slurry required for coating the positive electrode sheet of the battery through the lithium manganate positive electrode, the binder and the conductive agent; preparing the slurry required for coating the negative electrode sheet of the battery through the conductive agent containing the conductive graphene slurry Homogenization of materials; coating of battery positive and negative electrodes, and leaving empty foils on both sides of the positive and negative electrodes; rolling and shearing of battery positive and negative electrodes; battery assembly; battery formation and post-treatment process. The invention realizes the fast charging performance of the lithium manganate-lithium titanate battery at normal temperature, while maintaining its rate performance and cycle performance.