235results about How to "Sampling implementation" patented technology

The invention provides a flow sampling method and system for a software-defined network, and relates to the field of communication, in particular to a flow sampling method and system for a software-defined network. The method comprises the following steps: an SDN controller is used for acquiring flow sampling requirement from a north interface or a management interface; the SDN controller is used for matching the flow sampling requirement with current flow table entry information and SDN forwarding device information, generating a set table entry and a guide flow table entry for performing sampling behavior, and sending the set table entry and the guide flow table entry to an SDN forwarding device, wherein the set table entry comprises a sampling ratio, and the guide flow table entry comprises flow information and associated set table entry ID; the SDN forwarding device is used for sampling the flow according to the guide flow table entry and the set table entry after receiving the set table entry and the guide flow table entry. The technical scheme provided by the invention is applicable to the software-defined network; according to the method, the SDN flow sampling with service continuity is achieved.

In the invention, rainfall unit, canopy and low step face model are position at upper, middle and lower parts of bracket. Rainfall unit includes main pipe connected to water inlet pipe and branch pipes, and discharge pipe is in side opposite to the main pipe. Low step face model includes slope face, sidewall, movable lateral clapboard and movable back clapboard. Four sidewalls in model are sidewall, front wall, movable lateral clapboard and movable back clapboard. The invention includes sampler, curb and runoff bucket are arranged at proper position. Main pipe and branch pipes are made from PVC. Raininess is even. The invented equipment is suitable to indoor model test for larger area. The equipment is easy to be installed.

The invention discloses a device for collecting bottom sediments and submarine water simultaneously. The device comprises a sampling tube, a piston, a balance weight, a water collecting box and a balance wing; a plastic sleeve is arranged in the sampling tube and used for storing bottom sediment samples; the piston arranged in the plastic sleeve is connected with a cable, and extends out of the top of the sampling tube, and is driven to move upwards by pulling the cable, so that the bottom sediment samples are pulled into the plastic sleeve; an automatic opening assembly is arranged at the bottom of the water collecting box and is opened under pressure of seawater when the device sinks in the sea and is inserted into the bottom sediments so that the submarine water is sampled into the water collecting box; the automatic opening assembly is closed when the sampling device floats so that the submarine water sample is sealed. The device has both functions of collecting bottom sediments and submarine water and can collect the submarine water sample at the position 1-2m away from the seabed.

The invention provides a method and device for achieving return of an electric lifting table when an obstruction is encountered through a current dual-filter mode. The electric lifting table is driven by a motor to be lifted. The method comprises the following steps that a, signals of currents flowing through the motor are obtained and converted into voltage signals; b, the voltage signals are filtered; c, operation is carried out on voltage values of the filtered voltage signals to obtain comparison values; d, the comparison values and set values are compared to make a decision to control forward and reverse rotation of the motor. Cost is low, reliability is high, the structure is simple, and sensitivity is adjustable.

A DC mutual inductor check meter combining analog quantity and digital quantity verification functions comprises a main control module, an analog input sampling module, a digital quantity input parse module, a clock synchronization module, a man-machine exchange module, and a power supply module powering corresponding modules; the check meter also comprises following device interfaces: a clock synchronization interface, at least two analog input interfaces, and at least one digital quantity input optical network port; the analog input interfaces are connected with the analog input sampling module; the digital quantity input optical network port is connected with the digital quantity input parse module; the clock synchronization module is connected with the clock synchronization interface and the main control module; the main control module further processes the data sent by the analog input sampling module and the digital quantity input parse module, and processed data is sent to and displayed by the man-machine exchange module. The check meter can check the DC mutual inductors of either analog output type or digital quantity output type.

The invention relates to the field of signal sampling and signal detection, and in particular relates to a compressed sampling signal detection method based on a modulated wideband converter which detects the signals after obtaining the sampling value of a sub-Nyquist sampling rate through compressed sampling passive radar and electronic reconnaissance signals. The method comprises the steps of setting parameter, processing the signal entering an MWC structure with M parallel channels; computing the covariance matrix of a sampling matrix; getting the characteristic value of the covariance matrix and normalizing; computing the correlation coefficient of the normalization characteristic value; and judging whether the signal exists according to the obtain correlation coefficient and a threshold. With the application of the compressed sampling signal detection method based on the modulated wideband converter into the detection of broadband signals, the sub-Nyquist sampling can be ensured, and less data is used for storing under the premise of ensuring that the target can be detected out, and thereby the storage resources of a receiver are saved.

The invention relates to a seabed refrigeration pressure retaining type gravity piston sampling device and a sampling method thereof. The sampling device provided by the invention is formed by a gravity sampling pipe, a refrigeration mechanism and a pressure retaining mechanism. The sampling pipe is formed by an outer pipe, an inner pipe, a piston, a piston rod and a counterweight connector; a cavity between the outer pipe and the inner pipe forms a refrigeration cavity; a cold storage mechanism is arranged on the upper end of the counterweight connector. The pressure retaining mechanism is arranged in the sampling pipe, and is formed by an impact block, a positioning steel ball, a positioning spring, a pushing rod, a thrust spring, a rocking bar, a connecting rod and a pressure retaining ball valve. The sampling method provided by the invention comprises the following steps of enabling a natural gas hydrate layer to penetrate into the cavity sampling device by utilizing kinetic energy and gravitational potential energy during a process of lowering to a seabed through the cavity sampling device, closing a cavity of the cavity sampling device, and meanwhile, injecting a cold source into a refrigerating cavity refrigerating core from the cold storage cavity. On one hand, the critical decomposition pressure of the natural gas hydrate is reduced, and on the other hand, a self-protection effect of the natural gas hydrate is improved, so that the decomposition of natural gas is reduced, and the requirement on a natural gas hydrate pressure retaining mechanism is reduced.

The invention discloses a water quality detection and sampling device for shrimp and crab polyculture in a park paddy field. The water quality detection and sampling device comprises a water quality sampling barrel, wherein a plurality of separation plates are arranged in the water quality sampling barrel; side edges of the separation plates are fixedly connected with an inner side wall of the water quality sampling barrel in a sealing manner; the separation plates are used for dividing the inner part of the water quality sampling barrel into a plurality of water quality sampling rooms; waterdischarging end openings are formed in side walls of the bottoms of the water quality sampling rooms; side edge of water blocking plates are connected with inner side walls of water inlet channels ina manner of sliding leftward and rightward; stopping rings are arranged at the right sides of the blocking plates; the left end faces of the blocking plates are fixedly connected with pushing and pressing rods which penetrate through the water inlet channels; baffle plates are arranged at penetrating-out ends of the pushing and pressing rods; the baffle plates are connected with the side walls ofthe water inlet channels through pressure springs; the elastic coefficients of the pressure springs in the water quality sampling rooms are gradually increased from top to bottom. The device is simple in structure and water quality with different depths can be automatically sampled, without the need of operation; the device is convenient to operate, can be used for sampling the water quality andslurry at the same time so as to improve the detection comprehensiveness and has relatively strong practicability.

The invention discloses a sampling device and method for a geological exploration rock-soil body. The device comprises a mounting seat which is arranged at the upper end of a support seat, wherein the bottom portion of the support seat is provided with a base; a first motor is fixedly installed at the top portion of the inner cavity of the mounting seat, and a driving belt pulley is fixedly mounted at the output end of the first motor; a driving screw is vertically arranged in the support seat, a driven belt pulley is fixedly arranged at the top end of the driving screw, and the driven belt pulley is connected with the driving belt pulley through a driving belt; and moving seats slidingly sleeve transmission screws, and the moving seats sleeve the transmission screws; a moving seat connecting plate is horizontally arranged between the two moving seats, a second power mechanism is arranged on the moving seat connecting plate, and a sampling drill rod is connected with the output end of the second power mechanism. By cooperation of the first motor, the driving belt pulley and the driven belt pulley, the operation of the moving seats are stable, so that the sampling drill rod is kept in a vertical state in the running process and is prevented from being bent.

The invention discloses a cabin type gas sampler, comprising a sampling device and a control system, wherein, the control system is connected with the sampling device and is provided with an air pump and a controller; the controller is electrically connected with the air pump and controls the air pump to operate by outputting control signals; the air pump is communicated with the sampling device by a pipeline. The gas sampler is characterized in that the sampling device comprises a sealed cabin and a sample storage device which is arranged in the sealed cabin and is communicated with the outside of the sealed cabin. The gas sampler has high reliability and simple structure and does not need to carry out vacuum treatment on sample gas collection containers, thus having simple operation procedures and wide application range.

The invention discloses an ocean environment and sample collection system based on merchant ship carrying. The ocean environment and sample collection system comprises an information processing system, wherein the information processing system is connected with a ship-carried sampling and control system. According to the ocean environment and sample collection system disclosed by the invention, automatic collection of ocean environment samples and online obtaining of environmental and geographic information are realized by utilizing a modern electronic and information technology; an expandable sampling platform is provided and can be carried on a merchant ship to be operated by a non-specialized person, so that the scientific research cost is reduced. The ocean environment and sample collection system based on the merchant ship carrying disclosed by the invention can be widely applied to the field of environmental sciences.

The invention relates to a data acquisition card capable of automatically adjusting a sampling rate and belongs to the data acquisition technology field. The data acquisition card comprises a signal acquisition module, a signal conditioning module, a first filtering shaping module, a single-chip micro computer and a USB interface chip, wherein the first filtering shaping unit comprises a first waveform shaping module and a first low pass filtering module, and the single-chip microcomputer comprises a single-chip microcomputer core, a first timer, a second timer, a third timer, a first ADC module, a first DMA module, a second DMA module, a memory and an FSMC interface module. The data acquisition card is advantaged in that the sampling rate can be automatically adjusted according to frequency of acquired simulation input signals, flexible sampling of the acquired simulation input signals is realized, redundancy data can be effectively removed, the acquisition data bulk is reduced, and the data acquisition time and data storage cost of the data acquisition card can be saved to a maximum degree.

The invention discloses a probability load flow calculation method considering the admitting ability of a power grid. The method comprises the following steps that 1, a cumulative distribution function of a new energy power generation power variable is built according to the admitting ability of the power grid to new energy power generation power, wherein the cumulative distribution function is described in the form of a piecewise function; 2, the sampling frequency between all sections of the new energy power generation variable is calculated according to the cumulative distribution function F(pk) of the built new energy power generation power variable based on the proportional distribution principle, then a Latin hypercube sampling method is utilized for sampling all the sections of the new energy power generation power variable, and a sample matrix of the new energy power generation power variable is built; 3, the sample matrix of the new energy power generation power variable is adopted as an input variable for probability load flow calculation, a disperse result of an output variable is obtained, an empirical distribution function is utilized for fitting, and a probability distribution function of the output variable is obtained. The application range of the Latin hypercube sampling method is widened, and calculating precision is guaranteed.

The invention discloses a Current sampling method of a DC-DC conversion circuit, a current-sharing control method and a circuit. The sampling method comprises the following step of triggering the sampling on the current at a set moment in a PWM signal period according to a PWM signal of a switch tube; the currentp0-sharing control circuit comprises a sampling circuit, a current difference generating circuit and a duty ratio regulating circuit; the current difference generating circuit is used for generating the current difference between the first phase current and the second phase current; and the duty ratio regulating circuit is used for regulating the duty ratio of a first phase PWM signal for controlling the first phase current or the second phase PWM signal for controlling the second phase current according to the current difference.

The invention relates to the field of seabed observation, and particularly relates to a seabed sand wave long-term observation device and method applied to an internal wave development area. A supporting mechanism is in the shape of a balance and comprises a gravity anchor, hexagonal rods, an annular instrument control cabin and supporting rods, the gravity anchor is positioned at the bottom of the whole device, the gravity anchor is connected with the annular instrument control cabin above the gravity anchor through a plurality of hexagonal rods, an internal wave energy power generation mechanism is arranged in the annular instrument control cabin, two supporting rods are symmetrically fixed on the outer side of the annular instrument control cabin, one supporting rod is connected with amultifunctional observation rod through a mechanical grabbing ring at the end of the supporting rod, the other supporting rod is connected with a sandy sediment sampling rod through a mechanical grabbing ring at the end of the supporting rod, and the top of the annular instrument control cabin is connected with a subsurface buoy at a seawater boundary layer through a Kevlar cable. Ocean internal wave energy is fully utilized, long-term in-situ observation of seabed sand waves is achieved, the observation result is accurate and reliable, the observation cost is low, and collection and recoveryof seabed sand wave soil samples are achieved.

The invention discloses a high-side current sampling circuit comprising a sampling resistor R4 and a differential amplifier circuit, wherein the sampling resistor R4 is connected in series to a high voltage end of a sampled circuit; the differential amplifier circuit is connected to two ends of the sampling resistor R4 and comprises a grounding end which is grounded and used for amplifying and outputting the voltages at two ends of the sampling resistor R4, and the amplified voltage takes the grounding end as a reference point. As the differential amplifier circuit of the high-side current sampling circuit comprises the grounding end which is grounded, and the voltage amplified by the differential amplifying circuit, i.e., the sampling voltage, takes the grounding end as the reference point, the defect that the high-side current sampling circuit in the prior art is used for sampling by taking a power supply as the reference point is avoided and the technical problem is effectively changed.

The invention discloses a three-coil attitude-adjustable electromagnetic force feedback device and a coil attitude calculating and coil current intelligent control method thereof. According to the technical scheme of the invention, a probability description-based interactive application demand model is established for different electromagnetic forces varied in magnitude and direction in different space ranges, and a coil attitude calculating method for reducing the power dissipation of different interactive applications is designed based on the above demand model. Meanwhile, an integrated current intelligent control method is provided. The method comprises a coil current control interface circuit based on an ARM Cortex-M3 embedded microcontroller and an H-bridge driver, wherein one or more sampling resistors connected in parallel are sampled by a current sensor according to the requirements of different interactive application demands on the feedback force range and the precision. In this way, the high-precision current-sampling technique capable of improving the current sampling precision and lowering the power consumption is realized. Meanwhile, on the basis that the coil current is sampled by the above technique, the intelligent adjustment of the coil current based on the self-adaptive fuzzy PID algorithm is realized.

The invention provides an electric-dazzling prevention device and an electric-dazzling prevention method of bidirectional zero-clearance conversion current based on self-adaption. The electric-dazzling prevention device comprises a mains power voltage amplitude detection sampling circuit, a 220V power grid voltage current phase sampling circuit, a rectification module, a direct-current voltage reduction module circuit, a singlechip main control unit, a power supply module, a high-frequency transformer output circuit, a driving circuit, a bidirectional triode thyristor zero-clearance conversion current switching main circuit and a load voltage current detection circuit. According to the electric-dazzling prevention device, an alternative-current sampling technique is adopted to sample a power grid sinusoidal voltage amplitude value and a voltage current phase position, negative phase voltage is converted into positive phase voltage, and the amplitude value is correspondingly reduced to be a range that a singlechip main control unit can endure. Due to the adoption of the bidirectional triode thyristor zero-clearance conversion current structure based on self-adaption, the situation of current cutoff is well avoided in a smooth follow current mode, and the switching reliability is improved. As a bypass type structure is adopted to access a relay to the circuit, fault points are reduced, moreover, the service life of a triode thyristor is prolonged.

The invention relates to a method for fully-automatic on-line sampling of a freeze dryer. The method comprises that: in a freeze-drying box with a vacuum state, a motor drives an outer driving turnplate through a coupling; the outer driving turnplate adopts a magnetic coupling method to be connected with and drive an inner driving turnplate; the inner driving turnplate drives a manipulator on a crank through the coupling to grab a sample bottle placed on a board layer; the crank drives the manipulator to convey the sample bottle into an opened inner wicket of a vacuum chamber, the inner wicket is closed, an outer wicket is opened, the manipulator loosens, and the sample bottle drops off; and an operator takes off the sample bottle from one side of the outer wicket, and then the outer wicket closes automatically. The method overcomes the defect of a method that a long rod extends into the freeze-drying box to clamp a bottle manually for taking the bottle out of the middle vacuum chamber, realizes that sampling is performed in a vacuum state, and prevents polluted air from entering during the sampling or leakage caused by aging due to alternating low temperature and steam high temperature from impacting the quality of freeze-drying products in the freeze-drying box and discarding the products in bulk as useless; and the freeze-drying pass rate reaches over 99 percent.

The invention discloses a CMOS image sensor pixel sampling method, comprising the following steps of: firstly, sampling reading rows and reading columns through arranging an image sensor; arranging the total number of the reading rows of each frame; secondly, arranging reset rows through a calculation formula; and finally, reading the current reading rows and resetting the current reset rows according to the calculated result. In the image sensor pixel sampling way, reading row pixels and reading column pixels are selected according to a sampling value, meanwhile, non-reading rows are reset to realize irregular value pixel sampling, which breaks through the limitation which must sample according to the 1/2n traditional sampling value. The sampling method which enables the number of row pixels and the number of column pixel of output images of the CMOS image sensor to be reduced to 2m/2n times of the original number of the row pixels and the number of the column pixels is adopted, the frame rate can be improved so that all reading rows are correctly exposed sequentially and the color correctness of the output images is ensured.

The invention discloses a sampling and detection system and method of sulfur trioxide in coal fired boiler smoke gas. The system comprises a heating sampling gun, a heating filter, an electric heat tracing pipe, a condensation pipe, a constant temperature water bath box, a gas washing bottle and a vacuum pump, wherein a coiled pipe is arranged in the condensation pipe; a gun head of the heating sampling gun is positioned in a flue; an outlet of the heating sampling gun sequentially passes through the heating filter and the electric heat tracing pipe to be connected with one end of the coiled pipe; the other end of the coiled pipe is communicated with an inlet of the gas washing bottle; an outlet of the gas washing bottle is communicated with an inlet of the vacuum pump; a wet type flowmeter and an air pressure meter are arranged between the gas washing bottle and the vacuum pump; the constant temperature water bath box is communicated with the condensation pipe. The system and the method can accurately detect the concentration of SO3 in the smoke gas.

The invention discloses a liquefied natural gas sampling and continuous collecting device, which comprises a sampling system, a gasification system, an on-line analysis system and a continuous collecting system, wherein the sampling system comprises an LNG sampling probe, a sampling pipeline and an LNG filling pipeline; a closed deep cooling cavity is formed at the front end of the LNG sampling probe; the sampling pipeline is arranged in the LNG sampling probe in a penetrating manner; the LNG filling pipeline is arranged in the LNG sampling probe in a penetrating mode and communicates with a closed deep cooling cavity; one end of the sampling pipeline penetrates through the closed deep cooling cavity and is connected to the gasification system; the gasification system is used for gasifyingan LNG sample conveyed by the sampling pipeline; the on-line analysis system is connected to an outlet of the gasification system and is used for carrying out on-line analysis on a gasified natural gas sample and providing gas component parameters; and the continuous collecting system is connected to the outlet of the gasification system and is used for continuously collecting the gasified natural gas samples.