131results about How to "Short lag time" patented technology

The invention belongs to the technical field of energy conservation of a central air-conditioning system, and particularly relates to a control method for optimizing cooling water flow of total energy consumption of a refrigeration apparatus and a cooling water pump. The method comprises the following steps: signal acquisition, signal treatment and conversion, primary control operation, secondary control operation, controlled quantity output and control of task execution. in the method, partial derivative of total power of the refrigeration apparatus and the cooling water pump to condensing pressure is taken as a parameter that represents whether the total power is in an approximately optimal sate or not, and the partial derivative of the total power of the refrigeration apparatus and the cooling water pump to the condensing pressure is calculate online by acquiring the parameter of the condensing pressure and parameters of temperature and flow rate of cooling water, and the flow rate of the cooling water is controlled according to the value of the partial derivative, thereby realizing that the total power of the refrigeration apparatus and the cooling water pump approaches minimum, at the time, the value of the partial derivative is close to zero, so that energy conservation effect of variable flow of the cooling water can be played to the utmost extent.

The invention discloses an intelligent control system for an electromagnetic valve and a method of the intelligent control system. The system comprises a control signal generator, a high pressure source, a constant pressure source, a negative pressure source, a switch, a signal trigger, a current detector, an oil tank, the electromagnetic valve, pressure sensors, a calculator and a signal inverter, wherein the pressure sensors at an oil inlet and a working opening of the electromagnetic valve can be used for detecting oil pressure at any time and feeding the oil pressure back to the calculator; the calculator is used for automatically calculating start current, shutoff current and the size of the constant pressure source according to the data of the electromagnetic valve tested in earlier stage; the pressure sensors and the calculator are matched with each other in use; during a control process, the intelligent control system is capable of realizing intelligent regulation according to a pressure value measured by the sensors even the working condition of the electromagnetic valve has changes, so that the electromagnetic valve has a self-adaption capability to the working condition. By adopting the high pressure source for stimulation, adopting the constant pressure source for reducing current and adopting the negative pressure source for rapid unloading, the intelligent control system is capable of effectively reducing the delay time when the electromagnetic valve is opened or closed and improving the dynamic characteristics.

The invention relates to a soft measurement method of the outflow water quality of sewage treatment, comprising the following steps: selecting the TOC, the DO, the ORP and the pH value of inflow water as inputs and quantities, i.e. BOD or COD, to be subject to soft measurement as outputs, and procedurally storing the inputs and the outputs into an embedded type metering instrument by adopting a structural modeling of a PNN process neural network and on the basis of an improved algorithm of the PNN process neural network; firstly carrying out off-line network training, inputting multiple groups of acquired input quantity values, and regulating the network training by a self-adaption network of the metering instrument processing system till the precision of the network training achieves a preset value; carrying out on-line measurement and real-time sampling on a sewage treatment site, filtering obtained data and then inputting the obtained data to an instrument, and fast computing an obtained BOD or COD value by a computing system; and outputting display or printing. An on-line intelligent detecting instrument comprises a group of sensors, an analog-digital converter, a CPU central processor, input equipment and output equipment, wherein the group of sensors collects the TOC, the DO, the ORP and the pH value, and a soft measurement procedure module organized on the basis of the structure and the improved algorithm of the PNN process neural network is embedded into the CPU central processor.

A method for detecting and defending against a CC attack is disclosed, which comprises the following steps of: recording the number of times m of requests for a webpage and the number of times n of related requests for the webpage within a preset time interval if a user's request of accessing the webpage is a dynamic webpage request; and determining that the webpage is subjected to a CC attack if a value (m−n)/m is greater than or equal to a preset threshold. A corresponding apparatus is further disclosed. The method and the apparatus for detecting and defending against a CC attack of the present disclosure can accurately detect and defend against the CC attack.

The present invention relates to a PID control method of applying variation trend of a controlled variable. The method selects the appropriate positive and negative deviation values according to the variation rate of the controlled variable, when the controlled variable varies between a set value and a negative deviation value and is located during a rising process or the controlled variable varies between the set value and a positive deviation value and is located during a falling process, the valve location of an adjusting valve does not vary, and the adjusting valve adjusts according to a conventional PID control technology at other time. By utilizing the method of the present invention to adjust and control the controlled variable, the overshoot times and the amplitude can be reduced, the lag time is shortened, a tracking effect of the controlled variable is improved obviously, and the control precision and the gentle degree can be improved by more than 50%, at the same time, the frequent action time of an execution mechanism, for example, the adjusting valve is also reduced, and the usage time of a device is prolonged.

The invention belongs to instrument technical field, in particular to a thermal expansion continuous micro-flow high-pressure gradient pump of high-effect liquid spectrometer, composed of a pressure-resistance heating pump, a micro-flow pump control system, a switch valve, a pressure sensor, and a liquid bottle connected in turn. The invention uses the theory of liquid thermal expansion, via pre/real-time calculation to control the heating process of heated liquid, to obtain micro-flow at 10-5 to 10-9L/min level via increasing temperature, as constant flow, linear gradient liquid flow and other types, and the output pressure can reach 10-35MPa. And the invention uses a valve switch system to realize automatic alternative operation of two pump groups, to confirm continuous output of micro flow, and realize at least binary flow equal/gradient watch, and uses dual-pressure balance point exchange technique, to confirm stable flow speed and stable pressure in pump switch.

A nifedipine controlled release composition is provided comprising a drug-layer and a push-layer at a ratio of 1:0.5˜3 by weight. The drug-layer contains nifedipine and 40˜99 percent by weight of the drug-layer of hydrophilic polyvinylpyrrolidone homopolymer and/or copolymer carrier. The push-layer comprises about 10 to 80 percent by weight of the push-layer of osmopolymers, about 10 to 80 percent by weight of the push-layer of water-insoluble polymers, and about 5 to 50 percent by weight of the push-layer of osmagents. The composition is used in osmotic pump tablets for controlled release of nifedipine useful for administration once a day.

The invention discloses an SMA driven curved unit body and an S-shaped soft-bodied robot and relates to the technical field of soft-bodied robots. The curved unit body comprises an internal supportingassembly and a plurality of SMA springs. The internal supporting assembly comprises a supporting part, two spherical hinge devices and two joint end covers. Each joint end cover comprises an end plate and a connecting shaft, one end of the connecting shaft is connected with the end plate, and the other end of the connecting shaft is connected with the supporting part through one spherical hinge device. The two ends of the supporting part are provided with a plurality of spring steel plates. The other ends of the spring steel plates make contact with the end plates. The two ends of each SMA spring are connected with the two end plates correspondingly. The S-shaped soft-bodied robot is formed by connecting a plurality of curved unit bodies in sequence in a line-shaped mode and further comprises modular twisting unit bodies. The curved unit bodies and the twisting unit bodies are modularly arranged. The SMA driven curved unit body is simple in structure and convenient to manufacture, canbe assembled to form the S-shaped robot, bionic elephant trunks and the like and assembled into robots with different functions and has great using value and promoting significance in production andlife.

The invention relates to the technical field of network management, in particular to a traffic monitoring method and a traffic monitoring device, and aims at solving the problems in the prior art that time delay of data processing is large and traffic monitoring is lagging. The traffic monitoring method includes the following steps: a traffic monitoring device periodically obtains data traffic of network management equipment according to the set duration; if the traffic monitoring device judges that the obtained data traffic is not in a traffic monitoring range corresponding to the network management equipment, the traffic monitoring device gives an alarm according to set alarm information corresponding to the network management equipment. Due to the fact that the obtained data traffic is not in the traffic monitoring range corresponding to the network management equipment, the traffic monitoring device gives an alarm according to the set alarm information corresponding to the network management equipment. Consequently, the data traffic does not need to be stored in a database, the time delay of data processing is reduced, and the lagging time of traffic monitoring is shortened.

Provided is a protective layer formed using at least one selected from the group consisting of a magnesium oxide and a magnesium salt and at least one selected from the group consisting of a lithium salt, a lithium oxide, a germanium oxide, and a germanium element. Provided is also a composition for forming a protective layer. When the composition is used for a protective layer of a gas discharge display device, an electrode or a dielectric can be protected from plasma ions generated by discharge of a mixed gas of Ne+Xe or He+Ne+Xe, a lower discharge voltage and a shorter discharge lag time can be obtained.

The invention provides a formaldehyde detection device and method. The formaldehyde detection device comprises a formaldehyde absorption module, a formaldehyde separating and sampling module and a detection module, wherein the formaldehyde absorption module comprises a first pipe body, a liquid feeding pipe and a first water absorption type filling body; the formaldehyde separating and sampling module comprises a second pipe body, a guiding-in pipe and a second water absorption type filling body; the detection module comprises a shading shell, a reaction bed and a photoelectric sensor. According to the formaldehyde detection device, the sensitivity of the formaldehyde detection device is improved and the corresponding speed of the formaldehyde detection device is increased, so that the formaldehyde detection precision and efficiency are improved.

A powertrain control apparatus that controls a powertrain including a lock-up clutch, which connects an engine, in which fuel supply may be cut off, directly to an automatic transmission. The control apparatus includes an output unit, a control unit, and a setting unit. The output unit outputs an instruction to lower engagement pressure for the lock-up clutch from a value at which the lock-up clutch is engaged to a value at which the lock-up clutch is disengaged. The control unit resumes the fuel supply to the engine when a predetermined lag time has elapsed since the instruction is output. The setting unit sets the lag time so that the lag time is shorter when a temperature of a combustion chamber of the engine is a first temperature than when the temperature of the combustion chamber of the engine is a second temperature which is higher than the first temperature.

The invention provides an online continuous detection method of oil polymer resin material viscosity, comprising installing various instrumentations in a pipeline for real-time continuous detection of mass flow, pressure difference, temperature of the material in the pipeline and environmental temperature, carrying out a real-time field data acquisition by an industrial control computer and calculating the present viscosity of the material by a model preset in the computer. The invention uses the conventional instrument of mature technology and high-precision measurement for on-site signal detection with the characteristics of accurate measurement of the information and a small lag time.

The invention relates to a leak indicator comprising a base unit (10), which contains a vacuum pump (11), a test gas sensor (12) and a hand-held sniffer probe (16). The sniffer probe (16) is connected to the base unit (10) via a flexible hose (15) containing capillary lines (20). According to the invention, the hose is equipped with at least two capillary lines (20), which can be opened using valves (23). This permits different capillary cross-sections to be used. The dead time between the entry of the test gas into the sniffer probe (16) and its detection by the test gas sensor (12) can be modified or selected. This allows the smallest detectable leakage rate to be modified or selected. The leak indicator can be adapted by the user to various requirements, without said user having to change the hose. Different leak indicators of the same equipment family can also be equipped with the same hoses.

The invention relates to an exhalation membrane valve which comprises an exhalation valve body installation base 6, an exhalation adapter 8, an exhalation pressure air inlet base 2, a membrane assembly and an exhalation valve locking nut 1. The exhalation adapter 8 is connected with the exhalation valve body installation base 6. The exhalation pressure air inlet base 2 and the membrane assembly are sequentially arranged in the exhalation valve body installation base 6. The exhalation valve locking nut 1 is arranged on the outer side of the exhalation pressure air inlet base 2 and is rotatably fixed with the exhalation valve body installation base 6. A hollow exhalation valve membrane 5 divides a whole exhalation valve into an upper cavity and a lower cavity, two interfaces are arranged in a positive end expiratory pressure (PEEP) cavity 1, one interface is connected with a PEEP valve to control air inlet, and the other interface is connected with the air (the caliber is controlled by a flow proportional valve). Two interfaces are arranged in an exhalation cavity 12, one interface is connected with patient exhalation airflow, and the other interface is directly connected with the air. The membrane is thin-wall and hollow so that the membrane is sensitive to acting force exerted on the membrane very much and can fast respond to seal or release exhalation airflow, the delay time is shortened, data are accurate and reliability of breathing machines is improved.

The invention provides a method for enhancing the tracking convergence of an angle tracking system simulator. Through utilization of the method, cross coupling and an error accumulation can be reduced, and the convergence of an angle tracking process is improved. The method is achieved through the following technical scheme: after accurate amplitude adjustment, precision of which is better than 0.01dB, is performed on an intermediate frequency signal by a simulator signal processing unit, the adjusted intermediate frequency signal is divided into three signals, i.e., a sum signal, an azimuth sub signal and an elevation sub signal, via a demultiplexer, amplitude attenuations are performed on the three signals through the numerical control attenuators receiving an attenuation control command corresponding to simulator monitoring software, the sum signal after the corresponding amplitude attenuation directly sends to a tracking receiver, the azimuth and elevation sub signals send polarity switching respectively via 0/[Pi] switchers under the control of the simulator monitoring software, the switched azimuth and elevation sub signals are synthesized into a difference signal in a quadrature synthesizer, the difference signal is sent to the tracking receiver, and the tracking receiver extracts an angle error signal according to the sum signal and the difference signal and sends the angle error signal to an antenna servo feedback system so that an antenna is controlled to rotate in a direction facing to a target.

The invention discloses a multi-point multi-loop parallel temperature control system suitable for operating in a vacuum environment. The system is mainly composed of a central control unit (100), a temperature acquisition unit (200) and a distributed temperature control unit (300). The central control unit (100) is used for instruction issuing and data transmission of the temperature control function of the system, issues the control information of a central control terminal to a temperature acquisition interface unit (210) and a distributed temperature control interface unit (310), and receives the system operation information, status information, process information, data information and the like sent by the temperature acquisition interface unit (210) and the distributed temperature control interface unit (310). According to the invention, the data acquisition speed is greatly improved; the acquisition period is increased from 60S to milliseconds; the fastest acquisition speed is upto 50Hz (20ms); and the corresponding time of a control instruction is increased from 400ms to 5ms.

The invention generally provides a moisture barrier article comprising a polymer matrix with water vapor permeability equal to or below 1 g mm/(m2 day) at 90% relative humidity difference and the intended temperature of use between 15° C. and 30° C., and moisture absorbing particles dispersed in the matrix in an essentially uniform manner, wherein the moisture absorbing particles have an average diameter of between 1 and 15 micrometers and wherein the article has an average wall thickness to mean particle diameter of at least 10:1.

The invention provides an information pushing method and device and a server, and belongs to the technical field of the Internet. The method comprises the following steps: acquiring a target query word at the current time, wherein the query popularity of the target query word is greater than a preset threshold; obtaining target news content related to the target query word; obtaining a keyword setfrom the target news content according to preset disease words, wherein keywords included in the keyword set are matched with the preset disease words; determining a medical popularity score of the keyword according to the occurrence frequency of the keyword in the keyword set; obtaining a target medical topic from the keyword set according to the medical popularity score of the keyword; acquiring medical topic information related to the target medical topic, and pushing the medical topic information to the terminal. According to the method and the apparatus, the target medical topic behind the hot news event represented by the target query word can be quickly mined, and the medical topic information related to the target medical topic is pushed to the terminal, so that the production efficiency of the medical topic information is improved.

The invention discloses an online continuous detecting device of a butylbenzene rubber reaction converting rate. A section of vertical measuring pipe is arranged on an outlet material pipeline of a butylbenzene rubber device polymerization reactor by a pipe reducer and a rubber cement original pipeline; the large end of the pipe reducer is in seal communication with the vertical measuring pipe, and the small end of the pipe reducer is in seal communication with the rubber cement original pipeline; two pressure measuring points are extracted from the vertical measuring pipe, and a tiny differential pressure transmitter is used for measuring the pressure difference of the vertical pipeline between the two measuring points through which the rubber cement flows; a butylbenzene rubber cement temperature measuring point is arranged in the center in the vertical measuring pipe in the middle of the two pressure measuring points, and a temperature transmitter A is used for measuring rubber cement temperature; and an ambient temperature measuring point is arranged near the tiny differential pressure transmitter, and an ambient temperature transmitter B is used for measuring the ambient temperature. The three measured signal data are transmitted to a computer system for calculating. The invention adopts a conventional instrument and has the advantages of stable and reliable performance, less delay time, rapid response time, good closed loop control effect, convenient maintenance and long service life.

The invention discloses a thickness control method for a 1720mm strip steel cold continuous rolling unit, and belongs to the technical field of material processing engineering. A first thickness gaugeand a first knotmeter are arranged at the front side of a first rack; a second thickness gauge and a second knotmeter are arranged at the rear side of the first rack; a third speed gauge is arrangedat the rear side of a second rack; and a third thickness gauge is arranged at the rear side of a fifth rack. According to the invention, the adjustment in advance is carried out according to a feed forward signal and incoming material situation, and a next rolling mill is pressed and controlled by the indirect thickness measuring information at the entrance of the rolling mill. The control increment is reduced by delay pressing to avoid oscillation and reduce the lag time; the monitoring amount can be fed back to the front rack in time through a feedback signal, namely, the pressing position of a roller gap is adjusted according to a deviation signal after comparing a measured value with a given value, and the thickness is controlled within a deviation range.

A communication device including: a memory; and a processor coupled to the memory, the processor being configured to: transmit a communication frame toward another communication device connected to the communication device through a communication path; determine whether or not an error has occurred in the transmission of the communication frame; and switch a communication method for transmitting the communication frame from a first protocol to a second protocol that has a slower communication speed than the first protocol, in a case in which determination is made that an error occurrence rate during transmission using the first protocol is equal to or greater than a predetermined limit.

The invention discloses a double-voltage driving circuit of a high-speed switch valve. The double-voltage driving circuit is characterized in that a high-voltage control signal PWM1 is connected to the control end of a high-voltage control switch V1, the output end of a high-voltage voltage source U1 is connected with one end of the high-voltage control switch V1, the output end of a low-voltage voltage source U2 is connected with the other end of the high-voltage control switch V1 and the cathode end of a diode D2 through a diode D1, a driving control signal PWM2 is connected to the control end of a driving control switch V2, one end of the driving control switch V2 is grounded, the other end of the driving control switch V2 is connected with one end of a resistor RZ, the other end of theresistor RZ is connected with the cathode of a voltage-regulator tube DWZ, and the anode of the voltage-regulator tube DWZ is connected with the anode of the diode D2. According to the double-voltagedriving circuit of the high-speed switch valve, the structure is simple, the cost is low, the valve element pull-in and drop-out retardation time can be effectively shorten, and furthermore, a high-voltage power supply and a low-voltage power supply are used in a altering mode, so that heating of a coil is greatly reduced, and the service life of the high-speed switch valve is prolonged.