37results about How to "Sampling is simple" patented technology

The invention provides an acute toxicity algae infrared testing method of toxic and harmful substances, which adopts the sensitive algae liquid with the chlorophyll content not less than 4.0mg.L-1 and the toxicity test factors of a portable infrared thermometer. The contrast toxicity test is carried out by selecting the processing and concentration design of a test sample, the response dose and the minimum response concentration of the sensitive algae to the sample are determined by the sample dilution concentration and the adding amount of a first-appeared temperature response during the dilution concentration test of using different samples for response temperature difference and response time so as to determine the toxicity of the sample. The sensitivity of the method of the invention can achieve the sensitivity of a luminous bacteria method, the average testing time of the method and the average testing time of the luminous bacteria method are similar, the testing effect ofthe acute toxicity algae infrared testing method of the toxic and harmful substances is the same with the testing effect of the luminous bacteria method. The invention is characterized by convenient test, low cost, strong specificity, field test and so on.

The invention discloses a method for controlling a bridgeless PFC circuit and a device thereof, which relates to the technical field of power supply power factor correction. The method comprises the steps of: when an AC power supply operates in a negative half period, sampling an input current to the bridgeless PFC circuit, and obtaining a first sampling signal of the input current; when the AC power supply operates in a positive half period, sampling the input current of the bridgeless PFC circuit, and obtaining a second sampling signal of the input current; sampling the AC input voltage of the bridgeless PFC circuit, and obtaining a third sampling signal of the AC input voltage; and through processing the first sampling signal, the second sampling signal and the third sampling signal, obtaining a switch tube control signal, and adjusting the current loop of the bridgeless PFC circuit through the switch tube control signal. The method of the invention can be used for sampling the input current simply and effectively, thereby controlling and realizing AC input voltage tracking by input current.

The invention discloses a device and a method for realizing electrocardiogram display of a browser by a UDP (User Datagram Protocol) network protocol, and the device comprises an electrocardiogram sampling data sending device consisting of a NODEMCU (Non-Oriented Digital Enhanced Microprogrammed Control Unit) module, an AD623 instrumentation amplifier and an anti-interference electrocardiogram amplification circuit realized by a broadband pass filter consisting of two stages of 358 operational amplifiers. The NODEMCU module is wirelessly connected with a mobile phone or a computer through a built-in WIFI network, and a NodeJS UDP-to-WS protocol is configured on the mobile phone or the computer, so that the single-chip microcomputer can display a transverse wide dynamic electrocardiogram onthe mobile phone or the computer through UDP protocol network communication. Implementation of an HTML5-JS program at a browser end is a mainstream front-end technology, so that the programming environment requirement is reduced to the minimum, and the invention is particularly suitable for popularization and open sources. The mode has the greater significance that data processing and storage management are put on a mobile phone or a computer with stronger processing capacity and ultra-large storage capacity, so that the combination of the WIFI single chip microcomputer and the mobile phone or the computer makes the best of each other, and a new WIFI single chip microcomputer application mode is provided.

The invention relates to an?ecological soil sampler, and in order to solve the problems of difficult sample output after sampling, easy disturbance of soil layers, easy change of soil biological patterns and easy biomass loss existing in existing soil collectors, the invention further provides a completely split type rapid ecological soil sampler. Two plug pins are inserted into two jacks correspondingly to fixedly connect a first semicylindrical body and a second semicylindrical body into a complete sampling cylinder. Two inverted L-shaped sockets that are centrosymmetric with respect to a socket pipe cap central axis are processed on the lower outer wall of a socket pipe cap. A handle is in threaded connection with the upper end of an upright pipe through a second pipe hoop, and the upright pipe lower end is fixedly connected to the center of the socket pipe cap upper end. The upper end of the sampling cylinder is sheathed on the lower end inner wall of the socket pipe cap, and a first cylindrical pin and a second cylindrical pin are respectively clamped in the two inverted L-shaped sockets of the socket pipe cap. The ecological soil sampler provided in the invention is used for collecting ecological soil samples.

The invention relates to animal disease prevention and control equipment, in particular to an animal tissue sampler, which comprises a first arm handle, a secondary arm handle, an upper jaw and a lower jaw, wherein the first arm handle and the lower jaw are integrated into one body, the secondary arm handle and the upper jaw are integrated into one body, the first arm handle and the secondary arm handle are connected by a rotary shaft, a cutter is fixedly arranged on the lower part of the lower jaw, a through hole corresponding to the cutter in term of position is arranged on the lower jaw, a baffle and a pipe clamp are fixed on the lower part of the lower jaw, the right end of the baffle is fixedly connected with a pushing device, at least one sampling pipe is arranged between the pushing device and the right end of the pipe clamp, the upper part of the pipe clamp is fixed with two side surfaces of the lower jaw, a clamping groove is formed in the middle of the right side of the pipe clamp, the sampling pipes are arranged in the clamping groove, and the sampling pipe on the right end of the pipe clamp is corresponding to the through hole in term of position. The animal tissue sampler can simply, quickly, conveniently and easily sample, with less stress on animals, and the tissue samples are normative and unified, and easy to collect without pollution.

The invention discloses a method for detecting clenbuterol residue in hair. The method sequentially comprises the following steps: (1) pre-processing a hair sample: hydrolyzing the sample with alkali at a high temperature, extracting the sample with an organic solvent and reversely extracting the sample with acid water; and (2) taking deuterated clenbuterol-D9 aqueous solution with the concentration of 5-500ng / ml as an internal standard, and detecting the clenbuterol residue in hair by liquid chromatogramy-tandem mass spectrometry. The method has the following advantages: 1. hair is taken as a detection material, which provides easy sampling, convenient storage and repeatable sampling, sampling is simple and rapid and has trace amount and high efficiency; 2. the pre-processing method of the hair sample is optimized, which shortens the pre-processing time, simplifies the processing steps and obviously reduces the cost; and 3. an isotopic compound is taken as the internal standard, and the liquid chromatogramy-tandem mass spectrometry is used as a detection means, the minimum detection limit reaches 0.01ng / g, and the minimum quantification limit is 0.5ng / g. The method has the accurate and reliable capacity to qualitatively and quantitatively detect the clenbuterol, and can be taken as a tool for large sample screening or small sample confirmation.