48results about How to "Low test conditions" patented technology

The invention discloses a chitosan and chitin content measurement method in the chitosan fiber and cotton blended products. Acetic acid solution is used to separate the chitosan fiber on the blended product, and the chitosan content in the dissolved solution is measured through colloidal titration so as to obtain the chitosan content in the chitosan fiber and the cotton blended product; the chitosan fiber and the cotton blended product are treated with a sufficient amount of concentrated alkali to enable the chitin in the chitosan fiber to be fully converted into chitosan; then the chitosan content in the chitosan fiber and the cotton blended product after alkali treatment is measured according to the method for measuring the chitosan, and the chitosan content in the chitosan fiber and the cotton blended product is deducted from the measured chitosan content so as to obtain the chitin content in the chitosan fiber and the cotton blended product. The chitosan and chitin content measurement method has high measurement precision and accuracy, small toxicity of the reagent, less environmental pollution and easy operation, which provides a convenient, scientific and feasible detectionmethod for the vast number of small and medium-sized enterprises and primary inspection agencies.

The invention discloses a vacuum gauge and an operating method thereof. The core of the vacuum gauge is a planar thin film transistor structure composed of a tungsten trioxide thin film channel, ion gel, a source, a drain and a gate, wherein the source and the drain are connected to the two ends of the tungsten oxide thin film channel respectively; the gate is isolated from the channel; the ion gel covers the channel surface and is connected to the gate. The source, the drain and the gate are connected to an external voltage and current test source gauge to form a complete vacuum gauge. By applying a small bias voltage to the gate, the resistance of the tungsten trioxide thin film channel can be controlled, and the resistance variation amplitude of the tungsten trioxide thin film has a significant linear relationship with the degree of vacuum. Based on the principle, the vacuum gauge of the invention is simple in structure, flexible to configure, large in range, low in cost, small in volume and low in energy consumption. In addition, if a flexible mica substrate is used, the vacuum gauge can be operated in a bent state, which can meet the test requirements of devices having different internal geometric configurations.

The invention discloses a method for testing a Seebeck coefficient of a thermoelectric material. The method integrates characteristics of a steady state method and a dynamic method, and mainly comprises the following steps: I, according to a dynamic testing method, keeping the temperature of a low-temperature end of a sample generally unchanged, rapidly increasing the temperature of a high-temperature end, recording a temperature difference delta T and a potential difference delta U of two ends in real time, and performing linear fitting delta U and delta T into the relationship that delta U=alpha 1*delta T+delta u; II, according to the equation, when delta T=0, acquiring delta U deviation, or when delta U=0, acquiring delta T deviation, and determining the two values as system errors; III, when keeping the average temperature T0 of the sample the temperature difference of two ends unchanged within 5-10K, respectively testing a potential difference delta U0 and a temperature difference delta T0 by using the steady state testing method, and according to an equation that alpha reality=delta U0 / delta T0-delta T deviation=delta U0-delta U deviation / delta T0, introducing delta U deviation or delta T deviation, thereby obtaining alpha reality. By adopting the method, precise testing on the Seebeck coefficient is achieved, system errors introduced in the testing process are eliminated, testing condition requirements are reduced, and very great learning significances can be achieved for making and optimization of data acquisition and processing modes of self-developed, to be developed and conventional commercial equipment.

The invention provides a chemiluminiscence detection kit for a canine distemper virus antigen. The chemiluminiscence detection kit comprises a coated plate and a reagent which are arranged in a box body, wherein the reagent comprises a horseradish peroxidase marked goat anti-mouse antibody, a coating solution, a sealing solution, a washing solution and chemiluminiscence liquid; the coated plate is a light-emitting plate coated with a canine distemper virus antibody; the diluting degree of the canine distemper virus antibody is 1:(700-1000); the diluting degree of the horseradish peroxidase marked goat anti-mouse antibody is 1:2500. The chemiluminiscence detection kit for the canine distemper virus antigen has the characteristics of low cost, convenience, rapidness and low testing condition requirements; the detection efficiency is improved and the detection accuracy is also guaranteed; the chemiluminiscence detection kit can be used for export inspection, food export inspection and field rapid detection of an animal breeding industry.

The invention discloses a method for testing the initial position angle of a motor rotor, which solves the technical problems of high requirements for testing conditions for the initial position angle of the motor rotor and difficult actual operation in the prior art. The method includes the following steps: Step 1, firstly, a current i is given to the motor to be tested to make the motor run; Step 2, after the motor runs, the current i is set to zero, that is, i d =0 and i q =0; Step 3, read the voltage u of the motor stator d-axis and q-axis in the converter at this time d , u q ; Step 4, according to u d , u q The trigonometric function relationship between the calculation obtains the initial position angle deviation θ of the motor rotor err . The invention uses the d-axis and q-axis voltages of the motor stator to directly calculate the initial position angle deviation of the motor rotor; the corresponding relationship between the motor terminal voltage and the initial rotor position angle in the motor controller is clarified; the method is simple and suitable for engineering field operations; Fault diagnosis and error correction control to improve system functional safety.