332results about How to "Improve performance" patented technology

A semiconductor-on-insulator structure and a method of forming the silicon-on-insulator structure including an integrated graphene layer are disclosed. In an embodiment, the method comprises processing a silicon material to form a buried oxide layer within the silicon material, a silicon substrate below the buried oxide, and a silicon-on-insulator layer on the buried oxide. A graphene layer is transferred onto the silicon-on-insulator layer. Source and drain regions are formed in the silicon-on-insulator layer, and a gate is formed above the graphene. In one embodiment, the processing includes growing a respective oxide layer on each of first and second silicon sections, and joining these silicon sections together via the oxide layers to form the silicon material. The processing, in an embodiment, further includes removing a portion of the first silicon section, leaving a residual silicon layer on the bonded oxide, and the graphene layer is positioned on this residual silicon layer.

The present invention provides a reliable, high-repetition rate, production line compatible high energy photon source. A very hot plasma containing an active material is produced in vacuum chamber. The active material is an atomic element having an emission line within a desired extreme ultraviolet (EUV) range. A pulse power source comprising a charging capacitor and a magnetic compression circuit comprising a pulse transformer, provides electrical pulses having sufficient energy and electrical potential sufficient to produce the EUV light at an intermediate focus at rates in excess of 5 Watts. In preferred embodiments designed by Applicants in-band, EUV light energy at the intermediate focus is 45 Watts extendable to 105.8 Watts.

The invention discloses a multisource semantic analysis based information retrieval method. The method comprises the steps that document acquisition and preprocessing are performed; document modeling is performed by utilizing an LDA model, and a reverse index is established; obtaining and preprocessing of user's initial query are performed; multi-dimensional analysis is performed according to the judgment whether queried lexical items are professional medical vocabularies or not, lexical item weighting and query extension are performed based on WordNet and UMLS Metathesaurus; the similarity between a queried extended word set and documents undergoing dimensionality reduction of LDA is calculated, ranking is performed according to progressively decreasing similarity, and the documents which are not lower than a preset threshold value are extracted and returned to a user. The multisource semantic analysis based information retrieval method integrates the characteristics of the WordNet and the UMLS Metathesaurus, conducts multi-dimensional analysis, weighting and extension on the initial query, can make the user's query intention more accurately understood, utilizes the LDA model to perform document modeling, analyzes the document representation capacity of lexical items at hidden theme level and improves the document retrieval performance for the user.

An embodiment of the invention provides a method, a device and a system for searching repeated data. After a repeated-deleting file is partitioned into blocks, fingerprint information of block data is utilized to determine a metadata server responsible for search. When the fingerprint information of the block data is found to be stored in a database by search, the block data corresponding to the fingerprint information of the block data are transmitted to a shared-file system and are not required to be transmitted to the metadata server for storage. Compared with the prior art, the method, the device and the system for searching the repeated data reduce link cost to a large extent and improve system performance.

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

Systems and methods for managing divergence of best effort transactional support mechanisms in various transactional memory implementations using a portable transaction interface are described. This interface may be implemented by various combinations of best effort hardware features, including none at all. Because the features offered by this interface may be best effort, a default (e.g., software) implementation may always be possible without the need for special hardware support. Software may be written to the interface, and may be executable on a variety of platforms, taking advantage of best effort hardware features included on each one, while not depending on any particular mechanism. Multiple implementations of each operation defined by the interface may be included in one or more portable transaction interface libraries. Systems and / or application software may be written as platform-independent and / or portable, and may call functions of these libraries to implement the operations for a targeted execution environment.

The method decomposes received TDS - OFDM signal into two parts: frame synchronization of PN code and DFT data. Based on characteristics of transmission channel, one of following methods is selected to carry out channel estimation: (1) time domain correlation method of PN code is selected, when channel possesses short time multipath disturbance; (2) frequency domain PN transformation approach is selected when channel possesses long time multipath disturbance; (3) frequency domain decision directed feedback method is selected when channel possesses stability characteristics of invariant time. The invention is realized at FPGA of Tsinghua DMB - T, ASIC version receiver. Favorable effect is obtained through actual try out broadcasting and testing, and performance is better than other system evidently.

Described are methods and systems for variable length decoding. A first execution unit executes a first single instruction that optionally reverses the order of bits in an encoded bitstream. A second execution unit executes a second single instruction that extracts a specified number of bits from the bitstream produced by the first execution unit. A third execution unit executes a third single instruction that identifies a number of consecutive zero bit values at the head of the bitstream produced by the first execution unit. The outputs of the first, second and third execution units are used in a process that decodes the encoded bitstream.

The invention discloses a methanol gasoline and a preparation method thereof, relating to the field of new energy. The methanol gasoline comprises 15-30wt% of methanol, 67-83wt% of gasoline and 2-3wt% of additive. The preparation method comprises the following steps: pouring solubilizer, energy increasing and consumption reducing agent, anti-oxidant, metal corrosion inhibitor, rubber swelling inhibitor into a reaction vessel according to a required proportion with stirring, mixing uniformly to obtain an additive; mixing the additive with methanol according to a required proportion to obtain modified methanol; and mixing the modified methanol with gasoline according to a required proportion to obtain the methanol gasoline. The methanol gasoline disclosed in the invention has the advantagesof simple preparation and good performance, can be used mixed with a national standard gasoline in any proportion with similar energy consumption with the national standard gasoline and emission indexes that conforms to requirements of environmental protection, and can be widely used for various petrol-engined motor vehicles, such as car, carriage, fork truck, power-assisted vehicle, farm vehicle, motorcycle, load wagon and forklift.

A positive active material including a compound expressed by a general formula LimMxM′yM″zO2 (here, M designates at least one kind of element selected from Co, Ni and Mn, M′ designates at least one kind of element selected from Al, Cr, V, Fe, Cu, Zn, Sn, Ti, Mg, Sr, B, Ga, In, Si and Ge, and M″ designates at least one kind of element selected from Mg, Ca, B and Ga. Further, x is designated by an expression of 0.9≦x<1, y is indicated by an expression of 0.001≦y≦0.5, z is indicated by an expression of 0≦z≦0.5, and m is indicated by an expression of 0.5≦m) and lithium manganese oxide expressed by a general formula LisMn2-tMatO4 (here, the value of s is expressed by 0.9≦s, the value of t is located within a range expressed by 0.01≦t≦0.5, and Ma indicates one or a plurality of elements between Fe, Co, Ni, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge) are included, so that both a large capacity and the suppression of the rise of temperature of a battery upon overcharging operation are achieved.

The invention provides a density relay comprehensive checking instrument of a sulfur hexafluoride (SF6) breaker. The density relay comprehensive checking instrument consists of a hardware structure, a software structure and a pneumatic unit. Under the control of the software structure, the hardware structure drives the pneumatic unit to perform data acquisition and data analysis, and to communicate with a monitoring centre server unit; the hardware structure is divided into lower computer hardware and upper computer hardware; the lower computer hardware is arranged under a spot SF6 breaker, and the upper computer hardware is arranged on a main control chamber power measuring counter, so the communication is realized by a controller area network (CAN) bus network; the software structure is also divided into lower computer software and upper computer software; the lower computer software controls the lower computer hardware to monitor a checking spot and transmits relevant data to the upper computer hardware; the upper computer software controls the upper computer hardware to receive and process the data; the pneumatic unit consists of an air cylinder and a pipeline; a piston in the air cylinder performs stretching and propelling under the driving of a stepping motor; and under the control of an intelligent control output unit, a pressure value of air in an air path can be changed. The density relay comprehensive checking instrument of the SF6 breaker has wide application prospect in the monitoring technical field.

The invention relates to a method and a system for managing authority. The method includes steps of creating tree structures for defining all authority bodies and resource access authority information corresponding to each authority body; displaying all the authority bodies stored in the tree structures and the resource access authority information corresponding to each authority body in a user authority list mode; caching user information in login requests when the login request transmitted by users are received; searching user authority lists according to the cached user information after the users successfully log in, and acquiring the resource access authority information corresponding to the users; judging whether the optional user has the authority to access requested resources or not according to resource access authority of the user when requests for accessing an optional resource from the user are detected, allowing the user to access the resources if the uses has the access authority, or completing processing procedures if the user does not have the access authority. The method and the system have the advantages that resource management and authority control can be improved, operation behavior of the users can be regulated, and the performance of the system can be greatly improved.

The invention discloses an electro-hydraulic servo steering system and a steering control method of a multi-axle vehicle and the multi-axle vehicle with the steering system. The electro-hydraulic servo steering system comprises a hydraulic steering system and an electric control system, wherein the hydraulic steering system comprises a variable pump, power-assisted steering oil cylinders and a servo proportional valve; the power-assisted steering oil cylinders are at least arranged on various rear steering axles; the servo proportional valve is used for controlling the trend of an oil path and the flow adjustment; the electronic control system comprises a lower controller and an upper controller; the lower controller is in signal connection with the servo proportional valve on each steering axle and forms closed loop control; and the upper controller is used for calculating a target corner of each steering axle according to a first axle corner and a steering mode. According to the invention, the electronic control systems of a two-stage controller is optimized, so that the servo proportional valve and the lower controller form a small closed loop; the lower controller with high frequency response is matched with the servo proportional valve to ensure the precision; and a programmable logic controller is used for main calculation work and transmitting a corner instruction to the each lower controller. The invention has the advantages of simple structural arrangement, safety, reliability and favorable control stability.

System and method for scheduling spectrum sensing in cognitive radio systems. A method comprises sensing an availability of a spectrum band, computing a duration of an inter-sensing time block based on the availability of the spectrum band, and scheduling an occurrence of the spectrum sensing operation using the duration of the inter-sensing time block. Computing the duration of the inter-sensing time block based on the availability of the spectrum band allows for an optimization of communications of the cognitive radio system, thereby increasing spectral efficiency and reducing interference to licensed communications.

The invention discloses a spectrum sensing algorithm based on variational mode decomposition, and solves the problem that a signal at a receiving end is interfered by a noise background in the prior art. The method comprises the following steps of: 1, generating a simulation signal BPSK; 2, taking the mean value of the instantaneous frequencies of the components as a decomposition parameter, determining an optimal mode decomposition number K according to a change curve of the decomposition parameter, and setting an appropriate penalty factor alpha; 3, performing variational mode decompositionon the BPSK signal according to the obtained decomposition parameters; 4, respectively carrying out power spectrum estimation on the obtained L intrinsic modes; 5, taking the ratio of the sum of the spectral line intensities of the intrinsic modes to the sum of intensities of all the intrinsic modes as a test statistic; and 6, comparing the obtained test statistics with a judgment threshold, and making a final judgment. According to the method, the equivalent band-pass filtering characteristic and the Wiener filtering structure of variational mode decomposition are utilized, frequency bands are better divided, and denoising processing is better carried out; and compared with a traditional power spectrum segmented cancellation algorithm, the detection performance can be remarkably improved.

An arc welding method comprising the steps of accelerating a feeding speed of a welding wire to cause shorting between the welding wire and a base metal when a welding end signal is input during a period of arcing, retracting the welding wire backward thereafter until a wire retracting speed reaches a predetermined rate, controlling the wire retracting speed constant at this speed for a predetermined duration of time, then stopping the backward retraction of the welding wire, and then terminating a welding power output after supplying a predetermined amount of welding current for a predetermined duration of time starting from a time when opening of the shorting occurs during the backward retraction of the welding wire.

The invention provides an electronic tag data filtering method used for a radio frequency identification middleware. The middleware sequentially filters according to the source, type, coding range, behavior type and entity attribute of an electronic tag. The method comprehensively considers the attribute, behavior information and EPC network information of the tag, greatly reduces the redundant data and realizes the efficient screening of data.

An under-bump metallurgical structure between the bonding pad of a die or a substrate and a solder bump such that the principle constituent of the solder bump is lead-tin alloy or lead-free alloy. The under-bump metallurgical structure at least includes a metallic layer and a buffer metallic structure. The metallic layer is formed over the bonding pads of the die. Major constituents of the metallic layer include copper, aluminum, nickel, silver or gold. The buffer metallic structure between the metallic layer and the solder bump is capable of reducing the growth of inter-metallic compound due to chemical reaction between the metallic constituents of the metallic layer and tin from the solder bump.

The invention discloses a manufacturing process of a high-carbon tool steel SK85 cold-rolled wide steel strip. The process is characterized in that steel is subjected to converter smelting, LF furnacerefining and slab continuous casting to obtain continuous casting slabs with the thickness ranging from 210 mm to 230 mm, the continuous casting slabs are heated and subjected to hot continuous rolling and laminar cooling to reach the coiling temperature, a hot-rolled wide steel strip with the thickness ranging from 2.5 mm to 6.0 mm is obtained, the coiled hot-rolled wide steel strip is put in storage and slowly cooled to the room temperature, and the obtained metallographic structure is thin-sheet-shaped pearlite; the total reduction of first cold rolling is controlled to be 20%-50% after acid pickling of the hot-rolled wide steel strip, then spheroidizing annealing is conducted, the Vickers hardness HV5 is 180 or below, and the spheroidizing rate is 92% or above; after the steel strip is subjected to primary spheroidizing annealing, secondary cold rolling is conducted, the total reduction of cold rolling is controlled to be 30%-85%, and a cold-rolled wide steel strip with the finished product specification being 0.70-3.00 mm thick is obtained; the steel strip subjected to secondary cold rolling is further spheroidized and annealed, the Vickers hardness HV5 is 175 or below, and the spheroidizing rate is 94% or above; and then third cold rolling is conducted, the total reduction of cold rolling is controlled to be 50%-85%, and the cold-rolled wide steel strip with the finishedproduct specification being 0.10-0.70 mm thick is obtained.

The invention provides a synchronizer self-learning identification control method and a vehicle synchronizer position verification control method based on the synchronizer self-learning identification control method. According to the synchronizer self-learning identification control method, forward and reverse rotation of a gear selection and shifting motor are controlled, the voltage change of a gear selection and shifting position sensor is monitored so as to identify the state of a synchronizer reaching extreme positions, the voltage value of the position sensor when the synchronizer is at each extreme position is recorded, and therefore self-learning identification of gear selection information and gear shifting information of the synchronizer is realized. According to the position verification control method, when a speed changer reaches a bottom line, a vehicle runs for a certain period of time and the vehicle cannot be started normally due to gear selection and shifting, the synchronizer self-learning identification control method is adopted for learning and identification of the gear selection information and the gear shifting information. By means of the synchronizer self-learning identification control method and the position verification control method, the problem that the synchronizer is inaccurate in position because of multiple factors is effectively eliminated, gear selection and shifting of the vehicle can be based on a correct synchronizer position, and therefore the correctness of gear selection and shifting of the vehicle is guaranteed.

The invention provides a multi-layer multi-chip fan-out structure. The multi-layer multi-chip fan-out structure comprises a bearing plate, and a plurality of packaging sub bodies which are stacked are arranged on the bearing plate; at least one die is packaged into each packaging sub body; in each packaging sub body, the die is coated by a dielectric material of a dielectric layer, and the die is attached to a metal cushion block with the front face faces upwards; an RDL layer is arranged on the dielectric layer of each packaging sub body; a bonding pad of the front face of each die is electrically connected with the RDL layer of the corresponding packaging sub body where the die exists; insulating layers are arranged between adjacent packaging sub bodies, and the RDL layers of the adjacent packaging sub bodies are electrically connected through second interconnection holes between the layers. The metal cushion blocks in the bottom packaging sub bodies are pressed on the surface of the bearing plate, and the metal cushion blocks in the middle or top packaging sub bodies are pressed on the insulating layers of the packaging sub bodies; the surface of each top packaging sub body is provided with a solder mask layer in a distributed mode. According to the multi-layer multi-chip fan-out structure, three-dimensional multi-chip stacking can be easily achieved.

The present invention discloses a wavelength division multiplexing (WDM) optical network route and wavelength distribution method, including digital computer, said digital computer executes the following steps: making network resource configuration; calculating route between any two notes in the optical network; forming standby route set; according to the requirements of calling service taking out all the stand by routes related to said service from stand by route set and calculating according to the formula, and selecting route and wavelength which have minium affection on network resource to distribute them to calling service. Said invention can reduce blocking rate of whole network, improve fairness and raise performance of whole network.

The invention discloses a high-entropy interlayer alloy, which comprises the following components in atomic percentage: 5-10% of Ti, 5-10% of Fe, 25-30% of Al, 15-20% of Ni, 30-35% of Cu and 5-10% of Cr. The invention also discloses a method for welding TA2 / 0Cr18Ni9Ti by the high-entropy effect, which comprises the following steps that: high-entropy interlayer alloy is placed between the two plates to be welded, the high-entropy interlayer alloy is in a foil folding structure, and the high-entropy interlayer alloy and local parent metal are subjected to heat fusing by an interface resistor ina resistance spot welding mode, so that the high performance welding of TA2 / 0Cr18Ni9Ti can be realized. According to the method and the high-entropy interlayer alloy of the method, which are disclosed by the invention, the high-entropy interlayer alloy has the advantages of favorable strength, toughness and corrosion resistance, is easy to process and form and is convenient to weld and assembly. The preparation method has the advantages of simple step and low manufacture cost and is convenient to popularize.