81results about How to "Close in performance" patented technology

This invention presents a novel receiver architecture for full-duplex multi-level PAM systems. The receiver employs an Analog-to-Digital Converter (ADC) that has a sample rate flexibly specified as (N_s+1)/N_s baud rate where N_s is an integer equal or greater than 1. A fractional-spaced echo canceller is used to cancel the echo at the ADC output. The use of a fractional sampling rate higher than the baud rate also enables the timing recovery function be implemented in the digital domain and hence eliminates the need of using the complex analog phase selection circuit. The receiver is also capable of fast, blind start-up by use of a decision feedback equalizer with unity main tap and a soft level slicer. The timing phase can be optimally located using a derivative channel estimator. Once the “eye-open” condition is achieved, the channel equalization is switched to the use of linear equalizer coupled with an error feedback equalizer to alleviate the error propagation problem associated with the decision feedback equalizer.

This invention provides a relay precoder selection method for two-way amplify-and-forward multiple-input multiple-output (MIMO) relay systems and communication devices using the selection method or the selected relay precoder. According to the relationship between a relay precoder and the singular values of the effective MIMO channels, a set of candidate relay precoders are constructed based on the singular vector subspaces of cascaded MIMO channels, and one of them is selected for meeting a specific design criterion, such as the minimum sum of mean-squared errors, the maximum sum of channel capacities, and the minimum or maximum sum of condition numbers, where the condition number is defined as the ratio of the largest to the smallest singular value of a MIMO channel. As compared with the iterative design methods with the best performance, this invention achieves close performance while requiring much lower computational complexity.

The invention discloses an air-barrier glue for all-steel-wire truck radial tires, as well as a preparation method thereof. The glue comprises the following components in weight portion: 60 to 80 portions of natural glue, 20 to 40 portions of butadiene-styrene rubber, 40 to 65 portions of carbon black N660 as a reinforcing agent, 3 to 7 portions of zinc oxide as an activator, 1 to 4 portions of stearic acid, 2.5 to 5 portions of 204 resin as a tackifier, 2 to 5 portions of homogenizing agent UB4000 or 2 to 5 portions of homogenizing agent 40MSF, 0.5 to 2 portions of antiager 4020, 0.5 to 2 portions of antiager RD, 1 to 3 portions of protective wax, 2 to 4 portions of aromatic oil as a softening plasticizer, 0.5 to 1.0 portions of sulfur as a vulcanizing agent and 1.0 to 3.0 portions of accelerator NS or 1.0 to 3.0 portions of accelerator TBBS.

A central noise reduction loudspeaker includes a speaker unit, a top cap, a seat body, and a microphone. The speaker unit includes a diaphragm, and the diaphragm includes a central through hole located at center of the diaphragm. The top cap covers the seat body, and the speaker unit is disposed between the top cap and the seat body. The top cap includes a central fixed frame penetrating the central through hole of the diaphragm. The microphone is disposed within the central fixed frame and located in the central through hole. Since the microphone is disposed in central through hole, compared to conventional, the front cavity and the overall size of the loudspeaker or earphone can be reduced and the production process can be simplified.

The invention provides a method for regenerating nylon. The method comprises the following steps: firstly, treating a material containing the nylon in the presence of a solvent and a depolymerization catalyst at a temperature of 10 DEG C to 200 DEG C at a pressure of 0.4MPa to 4MPa so as to obtain a nylon oligomer; then, removing impurities from the obtained nylon oligomer; and finally, regulating a pH value of the treated nylon oligomer by using a diamine material so as to stabilize the pH value within 7.5 to 8, adding a polymerization catalyst, heating to 100 DEG C to 300 DEG C in a stirring manner and pressurizing to 0.4MPa to 3MPa until the melt index of the material reaches 30g to 60g per 10 minutes, thereby obtaining the regenerated nylon material. The method provided by the invention is simple in process, low in cost, easy to industrialize and high in nylon recycling rate. In addition, the performance of the obtained nylon material is approximate to that of a novel nylon material.

The invention relates to the field of textile fibers and provides a method for producing cationic type composite cotton yarn imitation threads to solve the problems of cotton fiber imitation polyester filaments. Cationic polyesters are used as raw materials to be produced into cationic POY/FDY (ITY) composite fibers through a POY/FDY composite fiber one-step spinning device, and the POY/FDY (ITY) composite fibers are subjected to false twisting machining to be produced into cationic composite cotton yarn imitation threads. The cotton yarn imitation threads produced through the method are provided with appearance characteristics of cotton yarn and good in hygroscopicity, dyeing property and pilling resistance.

The invention discloses an asphalt pavement aging simulating method. The method comprises the following steps: inquiring the climate and communication information of the area to be simulated, according to the climate and communication information, calculating the rutting equivalent temperature, UV accelerating factor, raining accelerating factor, and rutting accelerating factor; according to the service life of the simulated pavement, calculating the rutting time, UV radiation time, and spraying time; putting a rutting member into a pavement material life-cycle analysis instrument, starting the pavement material life-cycle analysis instrument to obtain a simulated aged member; and according to the analysis of the multifunctional pavement material life-cycle analysis instrument on the aged member and the weights of aging factors (rutting equivalent temperature, UV accelerating factor, raining accelerating factor, and rutting accelerating factor), obtaining the aging index of simulated member. The aging mode is controlled by a plurality of factors, and thus the simulation is more close to the actual situation of asphalt pavement.

The invention relates to a power battery self-discharge detecting and grading process. The process comprises the following steps of: carrying out capacity grading on formed batteries and recording discharge capacities as C1; carrying out high-temperature aging on the capacity graded batteries at a temperature of 40-80 DEG C for 3-7 days; carrying out capacity keeping rate test on the high-temperature aged batteries, recording the discharge capacities as C2, calculating ratios K of C2 to C1, selecting batteries with relative large self-discharge through the K and grading the other batteries, wherein the batteries, the K of which is smaller than or equal to R, are batteries with large self-discharge, namely, unqualified batteries, and the batteries, the K of which is between R and 100, are divided into N grades according to the K; and carrying out stock removal on the graded batteries according to the grades. According to the process, batteries with relatively large self-discharge can berapidly and effectively selected, and the batteries are divided into different grades during the detection, so that the grading process of module grouping sections is saved.

The invention provides a Fe-based metal glass composite coating enhanced by WC-Co as well as a preparation method of the coating. By volume, 10%-30% of WC-Co powder and 70%-90% of Fe-based amorphous powder are mixed evenly to obtain a mixture serving as a spraying material, and by virtue of a hypersonic flame spraying technology, the metal glass coating enhanced by a hard alloy is prepared on the surface of a part. Compared with the existing Fe-based amorphous coating, the Fe-based metal glass composite coating is higher in hardness, strength and wear-resisting performance. Compared with a WC-Co coating prepared by the same method, the Fe-based metal glass composite coating is similar in performance but much lower in cost. The Fe-based metal glass composite coating with excellent performance and low cost can be used for not only enhancing product performance during production of new products, but also repairing or re-manufacturing waste products, and has extensive application prospect.

The invention discloses a semiconductor wafer chip sorting method. Qualified chips on an original wafer can be sorted and the qualified chips are placed on a reconstructed wafer according to the performance level grouping rule of the chips. The semiconductor wafer chip sorting method comprises the following steps of a performance level marking step S101: dividing the qualified chips on the original wafer into M performance levels according to performance differences by a device traceability system; an original information transmission step S102; a performance level grouping step S103: carryingout level grouping rule setting on a sorting device; a performance level selection step S104: reading an original electronic wafer map, and selecting the qualified chips on the original wafer according to a grouping selection rule by the sorting device; a reconstructed wafer reconstruction step S105; and a reconstruction information transmission step S106. The invention also discloses a semiconductor product packaging method and system. The technical effects of saving cost and increasing a production rate are achieved.

A blade driving device for use in cameras that includes a mechanical shutter blade that openably and closably disposed in front of a CCD, and is capable of blocking light passing through an exposure aperture. The blade driving device also includes a motor that drives the shutter blade, and a control means that drive-controls the motor. In this blade driving device, photography is performed such that the storage of an electric charge starts in the CCD and the closing motion of the shutter blade is completed. Opening energization is applied to the motor in order to allow the shutter blade to pre-perform an opening motion before performing a closing motion whenever a still image is photographed. Thus, the shutter blade always reaches an opened state prior to photography even if the shutter blade is closed without permission by receiving an impulsive force from the outside because of, for example, being dropped. Therefore, photography can be reliably performed.

The invention discloses a method for predicting comprehensive performances of a motorized spindle. The method comprises: motorized spindle temperature information, a rotating speed, a torque, a power,noise information corresponding to the rotating speed, vibration information corresponding to the rotating speed, and motorized spindle axial runout information are collected; an upper computer processes the collected information and relational expressions between all parameters are established simultaneously; according to the relational expressions between all parameters, an optimal motorized spindle performance equation is established; an motorized spindle service life prediction model is established; the upper computer calculates conditions that need to be met by decision-making variablesin integrated motorized spindle testing and service life prediction and optimization according all collected parameters and the optimal motorized spindle performance equation; and a complete expression for integrated motorized spindle performance and service life prediction is constructed by using performance maximization and motorized spindle service life consumption minimization as optimizationobjectives, and a Pareto solution is obtained by using an NSGA-II algorithm. The prediction result obtained by the method is accurate and reliable and is close to the actual performance of the motorized spindle.

A channel statistical information-based precoding method for a multi-cell cooperation system comprises that (1) multi-cell base stations participating in cooperation obtain second-order statistical information of all user channels of the system; (2) base stations cooperate with each other, and precoding vectors of all users of the system are calculated by using the obtained second-order statistical information of channels according to the channel statistical information-based precoding method; and (3) base stations multiply data which are required to be sent by each user by the corresponding precoding vector of the user and send precoded data. The method is characterized in that real-time information is replaced with the statistical information of channels and precoding vectors are calculated by using the channel statistical information-based precoding method. In the system, when Doppler spread of channels is small, and when precoding vectors obtained on the basis of the second-order statistical information of channels are compared with precoding vectors obtained on the basis of the real-time information of channels, performance loss at operating points is small.