31results about How to "Controllable test conditions" patented technology

The invention discloses a method for cultivating a rose polyploidy variety. The method comprises a step (1) of moving female parent roses into a room at -5-0 DEG C when the female parent roses bear buds, performing pretreatment for 1-2 h, and using low temperature to kill viruses of the female parent roses; a step (2) of moving the female parent rose into a normal temperature room, and adopting colchicine to perform spraying method induction on buds of the female parent roses; a step (3) of collecting pollen of male parent roses to perform artificial pollination during a bud crack period, applying the pollen to stigmas of the female parent roses, performing daily management after the pollination, and obtaining rose seeds; a step (4) of performing flower field planting or soilless culture on the rose seeds, taking stem tips or root tips after plantation and adopting improved phenol fuchsine dyeing method to perform slide preparation, performing observation and camera shooting under a microscope, and checking the number of chromosomes of the plant, wherein the plant with a chromosome number of 21 is the obtained rose polyploidy variety. The method is high in mutagenesis success rate and low in cost, and test conditions are easy to control.

The invention belongs to the field of metal-containing catalyst preparation, and specifically relates to a Ta3N5 / C composite fiber photocatalyst and a preparation method thereof. The method adopts an electrostatic spinning method to be combined with a hydrothermal method and calcination to prepare the Ta3N5 / C composite fiber photocatalyst. According to the prepared Ta3N5 / C composite fiber photocatalyst, a Ta3N5 nano fiber is evenly coated with a C membrane, a good heterojunction is formed, recombination of photo-generated electrons and holes is effectively restrained, and the Ta3N5 photocatalytic activity and stability performance are improved; besides, the Ta3N5 / C composite fiber photocatalyst has the characteristic of being easy to recycle, is a good photocatalytic material, and has important application values in environment, energy sources and other fields; and the preparation method is simple, equipment and other costs are relatively low, test conditions are controllable, and mass production preparation is facilitated.

The invention discloses a device and a method for testing noise indoors by means of simulating driving of an automobile on a micro-surfacing road surface, and relates to a testing device and a testing method, in particular to the device and method for testing the noise indoors by means of simulating the driving of the automobile on the micro-surfacing road surface. The invention aims to solve the problems that a lot of manpower and material resources are necessarily consumed, and a measurement structure is affected by difficultly-controlled factors, such as wind speed, background noise, traffic flow and the like in a certain degree during the process of testing the noise of the micro-surfacing road surface outdoors. The device comprises a pedestal, a circular runway, a testing wheel, a transverse shaft, a vertical shaft, a driving shaft, a lifting vertical shaft rotary knob, a driven gear, a driving gear, a hinged column base and an engine, wherein the circular runway is arranged on the upper surface of the pedestal; the engine is arranged in the pedestal; the lower end of the driving shaft is arranged at the middle part of the inner bottom surface of the pedestal through the hinged column base; the driven gear is arranged on the driving shaft in a sheathing manner. The device and the method disclosed by the invention are applied to testing of the noise of the micro-surfacing road surface.

The invention discloses a measurement system for a building material surface convective heat exchange coefficient. The measurement system consists of a thermal insulation box, industrial fan, an anemometer, a small automatic weather station, thermocouple temperature sensors, an air temperature sensor, a water temperature sensor and a building material test piece. Thermal insulation box and the building material test piece compose an enclosed box; the water temperature sensor is disposed in the thermal insulation box; the thermocouple temperature sensors are disposed on the surface of the building material test piece; the air temperature sensor is arranged in an external environment; and the thermocouple temperature sensors, the air temperature sensor, the water temperature sensor and the anemometer are all connected to the small automatic weather station for real-time acquisition and storage of test data. Based on the theory of heat transfer, the measurement system and method providedby the invention can achieve efficient, simple and accurate measurement of the convective heat exchange coefficient between a building material and the external environment, also take the heat absorption and heat release processes into account, can better simulate the thermal behavior of an actual engineering structural material in a service environment, and have good application prospects.

The invention discloses a method for measuring acute and chronic toxicity of a drug against varroa jacobsoni. The method comprises the following steps: gently spraying the to-be-measured liquid onto the surfaces of healthy bee larvae; transferring the bee larvae from the inside of a larva culture plate into a bee pupa culture cup with the liquid-infiltrated filter paper piece at the bottom; collecting the to-be-measured varroa jacobsoni; introducing a varroa jacobsoni into the bee pupa culture cups of each treatment group and control group, and sealing the cup rims of the bee pupa culture cups with ventilated transparent films to prevent the introduced varroa jacobsoni from escaping the bee pupa culture cups; putting the bee pupa culture cups into an incubator for culturing, wherein the temperature is 34.5 DEG C, and the relative humidity is 75%; counting the deaths of varroa jacobsoni 48h or 72h later, calculating the death rate and analyzing the acute toxicity of the drug against varroa jacobsoni; or continuously recording the survival conditions of the varroa jacobsoni every day, counting the survival time of each varroa jacobsoni, and analyzing the chronic toxicity of the drug against varroa jacobsoni. The method disclosed by the invention has the advantages of controllable experiment conditions, high survival rate of the varroa jacobsoni, long survival time and accurate and credible result.

The invention relates to a method for establishing a model for jointly evaluating the bioavailability and toxicity of food cadmium accumulation on the human body, comprising the following steps: (1) digestion of food samples and acquisition of measurement liquid: a. After the food samples are collected, grind them and use gastric juice and intestinal juice in sequence; b. Centrifuge the digestion mixture, collect the supernatant, and sterilize under high pressure; (2) Cultivate Caco-2 cells and 293T cells alone; (3) Combined culture of Caco-2 cells and 293T cells: The insertion tank with Caco-2 cells cultured was moved into a six-well plate with 293T cells cultured, and continued to culture for 24 hours; (4) Evaluation of cadmium bioavailability and toxicity: the food sample assay solution was placed in the Caco-2 cells of the joint culture model At the same time, add isotonic incubation solution on the 293T cell layer and continue to culture for 24 hours; in chronic toxicity test, the longest joint culture can be 10 days; (5) Index detection. The invention has the characteristics of simple operation, easy control of test conditions, less pollution, economy, accurate results, etc., and has the advantages of joint evaluation of biological effectiveness and toxicity. It is suitable for the safety evaluation of cadmium accumulation in grains, vegetables and animal foods.

The invention discloses a system for measuring the comprehensive radiation absorption coefficient of the surface of a building material. The system comprises a thermal insulation box, a solar total radiation sensor, an anemometer, a small automatic weather station, a thermocouple temperature sensor, an air temperature sensor, a water temperature sensor and a building materials test piece. The building material test piece and the thermal insulation box form a closed box, and the water temperature sensor is arranged in the box; the thermocouple temperature sensor is arranged on the surface of the building material test piece; the air temperature sensor is arranged in a test environment; the solar total radiation sensor and the anemometer are arranged nearby the building material test piece;the total solar radiation sensor is used for detecting the total solar radiation quantity; the anemometer is used for detecting the speed of wind flowing through the outer surface of the building material test piece; and the small automatic weather station is used for collecting and storing data in real time. The comprehensive radiation absorption coefficient is directly measured in a natural environment in order to well simulate the radiant heat behavior of an actual engineering structure material in a service environment.

The invention belongs to the technical field of bearing test equipment, and relates to a temperature-rise test device and method for sealed double-row angular contact ball bearings. A main body of the temperature-rise test device structurally comprises a driving motor, a driving belt wheel, a small belt wheel, a rotation speed sensor, a driving shaft, a control system, a main shaft, a sleeve, an iron sheet, a test bearing, a stress and measurement device, a locking nut, a withdrawal nut, an adapter sleeve, a body, a driving belt, a shell and a stud. The temperature-rise test method comprises the following four steps of: setting test parameters, and starting the test device; determining bearing temperature and environment temperature at initial rotation speed; measuring the bearing temperature and the environment temperature at rated rotation speed; and disassembling the bearing, and performing statistical computation on the measured temperature. The device and the method are applicable to a temperature-rise test on double-row angular contact ball bearings. A test result can be reproduced, and the consistency of test data is high; and the device is simple in structure, principle is reliable, test cost is low, the test result is accurate, test condition is easily controllable, and environmental friendliness can be achieved.