469results about How to "Avoid performance impact" patented technology

The invention discloses a phase measurement compensation method for airborne interferometric SAR (synthetic aperture radar) based on synchronous internal calibration signals, effectively improves precision in interchannel error measurement and compensation and lowers the effect of calibration signals on radar performance. A calibration signal source is used to generate a phase modulated internal calibration signal; the phase modulated internal calibration signal is divided into N signals by a shunt, the internal calibration signal is combined with radar echo signal, received by an antenna, through a combiner, the internal calibration signal and the radar echo signal in the same path are synchronously input to corresponding receiving channels by controlling start time of the internal calibration signal; a matching filter is used to extract internal calibration signals from radar data of each receiving channel so as to separate the internal calibration signals from radar echo in an image field; processes of the phases of the receiving channels changing with time is calculated according to phase changes of the internal calibration signals; interchannel phase error measurement and compensation are completed according to phase change processes of the channels, and transmission error correction is complete.

A satellite network transmission control protocol is a method for controlling data transmission in a satellite network transmission layer, used for carrying out flow control and error control for the transmission in a network, realizing high-efficiency data transmission and belonging to the technical field of computer network and satellite channel transmission. The method of the invention is characterized by the improvement made on the basis of the existing TCPW algorithm and realization of a TCPW-BC algorithm applicable to a satellite network having large time delay and high bit error rate. The algorithm mainly aims at improving the congestion avoidance in congestion control. On the basis of TCPW bandwidth estimation algorithm, the algorithm adopts a window control algorithm based on binary growth, approaches the optimum sending window through binary comparing growth, and carries out window adaptability adjustment at every RTT instead of after packet loss, raising network utilization rate. The invention is applicable to satellite networks having large time delay and high bit error rate and is capable of realizing high-efficiency data transmission.

The invention discloses a method for solving line-protection false tripping when overloading. The method comprises the steps of: for a ground distance relay III, discriminating whether the ground distance relay III is in overloading state or a fault state through a degree of asymmetry m, wherein the degree of asymmetry m is defined in formula (2), when m is smaller than and equal to k1,as the ground distance relay III is judged in the loading state and the limit condition is not open, when m is larger than and equal to k2, the ground distance relay III is judged in a light loading state, the limit condition is open, and when m is smaller than k2 and larger than k1, the ground distance relay III is judged in a heave loading state, additional limit conditions are increased and finally if the limit condition is open is judged; and for a phase spacing relay III, increasing the limit conditions in formula (6), wherein when the formula (6) is satisfied, the limit conditions are open, otherwise, the limit conditions are not open. The invention can ensure performance of distance protection in conditions of overloading as well as overloading and fault so as to avoid distance protection false tripping caused by overloading and eliminates a constant value adjusted by users of a loading limiting relay in a protector so as to avoid the problem brought by the wrong adjustment of the constant value.

Some embodiments provide an optimized multi-hit caching technique that minimizes the performance impact associated with caching of long-tail content while retaining much of the efficiency and minimal overhead associated with first hit caching in determining when to cache content. The optimized multi-hit caching utilizes a modified bloom filter implementation that performs flushing and state rolling to delete indices representing stale content from a bit array used to track hit counts without affecting identification of other content that may be represented with indices overlapping with those representing the stale content. Specifically, a copy of the bit array is stored prior to flushing the bit array so as to avoid losing track of previously requested and cached content when flushing the bit arrays and the flushing is performed to remove the bit indices representing stale content from the bit array and to minimize the possibility of a false positive.

The invention relates to high-strength fluorinated silicone rubber gross rubber and a preparation method thereof. The gross rubber is composed of the following raw materials in parts by mass: 100 parts of fluorinated silicone raw rubber, 30-80 parts of white carbon black, 0.5-15 parts of fluorinated silicone rubber cross-linking agent, 1-5 parts of reinforcing additive and 0.5-1.5 parts of vulcanizing agent; the raw materials of the high-strength fluorinated silicone rubber gross rubber are uniformly mixed on a mill mixer or an internal mixer and then the materials are discharged to obtain the fluorinated silicone rubber gross rubber. The main chain of the fluorinated silicone raw rubber which is utilized by the invention does not contain vinyl and the concentrated cross-linking is formedin a fluorinated silicone rubber vulcanizing system through utilizing the fluorinated silicone rubber cross-linking agent with a higher vinyl content to mix the fluorinated silicone rubber so that the mechanical property of the fluorinated silicone gross rubber is greatly improved.

The invention provides a carrier of pre-impregnating metal components, and hydrotreating catalyst containing the carrier, wherein carrier materials are Al 2 O 3, SiO 2, TiO 2, and a composite oxide of two of the Al 2 O 3, the SiO 2, and the TiO 2 which are prepared by a sol-gel method, a certain amount of molecular sieve is added into the carrier, saline solution containing nickel and cobalt is inducted in the process of the carrier materials prepared by a sol method, in order that the content of NiO and CoO in the carrier is 0.1 to 5 wt percent, the specific surface area of the obtained carrier containing the nickel or the cobalt is in 250 to 400 m <2> * g <-1>, and the pore volume is in 0.5 to 1.0 ml * g <-1>. The invention also provides a preparation method for the catalyst, group 6B metals and group 8 metals are taken as active components, the adoption of an equivalent-volumetric impregnation method produces the petroleum fraction hydrotreating catalyst, and the catalyst of the invention has excellent activity of hydrogen desulfurization and hydrodenitrification.

The invention discloses a multifunctional nanosized ferrite composite material with a double-shell structure and a preparation method of the multifunctional nanosized ferrite composite material. The composite material is prepared from spinel type nanosized ferrite as a nucleus, silicon dioxide as an intermediate layer and titanium dioxide as an outer shell layer. With adoption of the intermediatelayer, on one hand, chemical stability of a magnetic nucleus of the nanosized ferrite can be improved and the applicable range of the material can be extended, and on the other hand, influence of themagnetic nucleus on performance of the outer shell layer is prevented; the outer shell layer not only can endow the material with special characteristics of light, electricity, catalysis and the like,but also can be integrated with the characteristics of the magnetic nucleus, so that multifunctional nanoparticles are obtained. The preparation method mainly comprises steps as follows: a three-stepsol-gel method for material preparation, surface modification with function of improving dispersity and coating effect, ball milling, heat treatment process under atmosphere control and the like. Thenanosized ferrite particles with the double-shell structure have the advantages of relatively good dispersity, high specific surface area, tight combination of the shell layer and the nucleus; meanwhile, the application field of the material can be further expanded by modification of the shell layer.

The invention discloses a quick clock synchronization method for an EtherCAT master station control system. The quick clock synchronization method includes the steps: realizing quick clock synchronization by means of a clock frequency following method; setting a fixed period timing thread and a changeable period timing thread, and respectively processing the aperiodic data and the periodic data; and completing the clock frequency following function by changing the period of the changeable period timing thread. The quick clock synchronization method realizes synchronization of an EtherCAT master station and a reference clock, and can avoid the packet loss problem caused by clock asynchronization. The quick clock synchronization method utilizes the frequency following method to realize quick clock synchronization, avoids the influence of overlarge overshoot and uncertainty of settling time in the other clock synchronization methods on system performance, and can accurately and quickly track the operation frequency of the reference clock. The quick clock synchronization method utilizes the method of changing the operation frequency of the master station clock to realize clock synchronization, avoids time loss caused replacement of moment, and can guarantee stable operation of the system.

The invention discloses two interference communication methods under a heterogeneous network. A first method comprises the following steps that: when the path loss from a macro terminal (MUE) which is currently interfered most seriously to a family base station HeNB is correctly calculated based on the family base station HeNB, the number of hollow sub frames sent by the HeNB is adjusted, so that the purpose of downlink interference to the MUE is achieved, and simultaneously, the problem that the number of the hollow sub frames is too large and the self performance of the HeNB is affected is solved; and a second method comprises the following steps that: when the path loss from the MUE which is currently interfered most seriously to the HeNB is correctly calculated based on the HeNB, the downlink interference to the MUE is reduced by adjusting the sending power of the HeNB.

The invention relates to a Rogowski coil-based integrator circuit for an electronic current transformer. The integrator circuit consists of a Rogowski coil, a low-frequency gain planarization analog integrator and a signal processing circuit, wherein the Rogowski coil is used for outputting a transient signal to the low-frequency gain planarization analog integrator and outputting a steady-state signal to the signal processing circuit; the low-frequency gain planarization analog integrator is used for processing the transient signal output by the Rogowski coil and is connected with the Rogowski coil and the signal processing circuit; and the signal processing circuit is used for processing an output signal of the low-frequency gain planarization analog integrator and performing digital integration on the steady-state signal output by the Rogowski coil, and then the processed signal is transmitted to a protecting channel and a metering channel through an output interface circuit. The integrator circuit has the advantages of measuring the steady-state signal with high precision, quickly responding to the transient signal, and providing measurement data of the protecting channel and the metering channel at the same time through one Rogowski coil, along with high temperature stability and vibration resistance.

The invention discloses a preparation method of a high-entropy alloy coating layer on a surface of a casting. The preparation method comprises the following steps: (S1) preparation of a prefabricated body: adhesive is added in raw material powder of the high-entropy alloy coating layer for mixing to form paste; the paste is pressed as a cylindrical prefabricated body; and the prefabricated body is dried; (S2) shaping: sand is used for manufacturing a molding cavity of a sand mold; after the sand mold is cured, a groove is formed in the specific part of a molding cavity wall part; and the prefabricated body in the step (S1) is put in the groove; and (S3) pouring: molten metal is poured in the molding cavity under normal temperature and normal pressure; and the prefabricated body is dissolved and dispersed under the heat effect of the molten metal, and is solidified to form the high-entropy alloy coating layer on the surface of the casting. After the step (S3), the high-entropy alloy coating layer is subsequently heated. The prepared high-entropy alloy coating layer is excellent in density, better in metallurgic bonding degree with a basal body, simple in needed equipment, convenient for operation and low in production cost.

The invention relates to a method for preparation of an antioxidant composite coating on a carbon fiber surface. The antioxidant composite coating is an Al2O3-SiO2-TiO2 composite coating. The method is sol-gel method, which includes: composite sol preparation, carbon fiber surface activation treatment, coating, drying and heat treatment. The composite sol is prepared under room temperature, and the preparation process includes: firstly preparing a water-alcohol solution of tetraethyl orthosilicate and acetic acid into a mixed solution A, then pouring the mixed solution A into an alcohol solution of butyl titanate to prepare a mixed solution B, then under stirring, pouring an alcohol solution of aluminum nitrate nonahydrate into the mixed solution B to prepare a mixed solution C, finally adding an alcohol-water mixed solvent into the mixed solution C, and performing stirring to obtain the composite sol. With the ternary composite sol prepared by the method provided by the invention, a uniform and complete antioxidant coating with good adhesion and thickness within 3 micrometers can be prepared on the carbon fiber surface.

The invention provides a testing system and a server end thereof. The server end of the testing system comprises a main dispatching server, an auxiliary dispatching server, a testing server and a tracking device. The main dispatching server comprises a main dispatching unit, the auxiliary dispatching server and the testing server comprise executing units respectively, and the auxiliary dispatching server further comprises an auxiliary dispatching unit. The main dispatching unit is suitable for executing dispatching tasks which comprise the tasks of allocating testing tasks to the auxiliary dispatching server or the testing server. The auxiliary dispatching server is suitable for executing the dispatching tasks when the main dispatching server is abnormal. The executing units are suitable for executing the testing tasks allocated by the main dispatching unit or the auxiliary dispatching unit. The tracking device is suitable for ending a testing case which is in the executing process when a test abnormity is detected. According to the technical scheme, the testing system and the server end of the testing system are good in stability and high in testing efficiency.

The invention provides a zero drift compensation method of a Hall magnetic sensor. At present, the existing Hall magnetic sensor has the defects that the output voltage VH of the Hall magnetic sensor is not equal to zero, and the zero error VHO is generated because of factors such as unsymmetrical geometric positions of Hall electrodes, poor ohmic contact of the electrodes, nonuniform electric resistivity, nonuniform temperature and the like when the external magnetic filed B is equal to zero. In order to eliminate the zero error, the invention mainly adopts an external compensation circuit for compensating the zero drift. When the method is used, the magnetic sensor is difficult to develop in the directions of miniaturization and intelligentization. The invention uses a CMOS process for manufacturing grooves of the MOSFET Hall magnetic sensor so that the resistance values of four equivalent resistors are changed along with the external grid voltage. The invention is applicable to the fields of medicine, automobiles and the like.

The present invention is amphoteric imidazoline surfactant in the structure as shown and its synthesis. The amphoteric imidazoline surfactant of the present invention contains phosphate ester radical and carboxyethyl radical and has improved product performance.

The invention provides a method and a device of restraining narrow-band interference. The method specifically comprises the following steps of detecting a frequency which corresponds to the narrow-band interference when a system has the narrow-band interference; detecting whether a higher harmonic frequency of a system clock falls into the operating frequency range of the system when the frequency which corresponds to the narrow-band interference is the higher harmonic frequency of the system clock; when the higher harmonic frequency of the system clock falls into the operating frequency range of the system, adjusting the frequency of the system clock so as to cause the higher harmonic frequency of the system clock to fall out of the operating frequency range of the system. According to the method and the system, the influence of the narrow-band interference of the system on the system performance is solved, and the equipment cost is reduced.

The invention aims to provide a floating wind-hydraulic power generating set comprising a boat, a column frame, a sail opening-closing mechanism, a rope tension unit, and a generating unit. The column frame is fixed to the boat which floats on the sea. The generating unit is fixed toe a fixed shore base or fixed carrier. The column frame is connected with the sail opening-closing mechanism. One end of the rope tension unit is connected with the boat; the other end of the rope tension unit is connected with the generating unit. When the floating wind-hydraulic power generating set is in use, the sail opening-closing mechanism opens, the boat leaves the generating unit under the action of wind load and water flow, the rope tension unit drives a drive wheel of the generating unit to rotate, and power generation is achieved; when a regulated travel is reached, the sail opening-closing mechanism closes, a motor on the boat operates and tensions ropes, and the boat approaches to the generating unit. The floating wind-hydraulic power generating set has the advantages that generating efficiency is improved and capacity of the generating set can be expanded conveniently by changing the structural size of a sail.