61results about How to "The experimental phenomenon is obvious" patented technology

The invention discloses a device and a method for high-accuracy measurement of expansion coefficients of a metal wire. The method uses a PZT oscillating mirror system to perform frequency modulation on incident light at different times, can not only modulate parameter information to be measured to a phase difference, but also modulate the parameter information to be measured to in a frequency difference for the convenience of later signal treatments; and the device consists of an interference system, a high-speed PZT oscillating mirror system, a heating system and a signal processing system. Comparing the method with other measuring methods, a multi-beam laser heterodyne measuring method for measuring the expansion coefficients of the metal wire has the advantages of high space and time resolutions, high measurement accuracy, high linearity, quick dynamic response, large measuring range and the like, and simultaneously the method has the advantages of simple structure for an experimental apparatus, low power consumption, convenient operation, high repeatability, small experimental result error, high accuracy and the like. Because experimental phenomena are obvious and experimental data is reliable, the method and the device can be widely applied in the fields of engineering designs and the like, and have very high practical values in the field of laser ultra-precision measurements.

The invention provides a method and a device for simulating the water bloom floatation of blue algae, belonging to the field of water environment. The device comprises a reaction column, a light source and a heating sink, wherein the light source and the heating sink are arranged at the top of the reaction column; the top of the reaction column is sealed aseptically; the outer surface of the reaction column is provided with an aseptic aeration inlet, a culture liquid inlet, an aseptic stirring airflow inlet and a circulating water inlet; the middle of the reaction column is provided with a sampling inlet; and the lower part of the reaction column is provided with a circulating water inlet. The method comprises the following steps: carrying out the amplification culture of algae species; sterilizing culture fluid and a simulating device; placing the culture fluid in the reaction column; inoculating the blue algae into the reaction column for sealing; setting environmental conditions; and then, periodically sampling to analyze and observe the floating characteristics of the blue algae. The method enables the algae to grow in aseptic environments and can effectively simulate the waterbloom of the blue algae. The device has simple structure, small size, easy operation, strong removability, indoor and outdoor use, corollary use with an illumination culture box, convenient manufacture and low cost.

The invention discloses a device and a method for measuring a magnetoconstriction coefficient by using a Doppler polarizer through a sinusoidal modulation multi-beam laser heterodyne method, which belong to the technical field of micrometric displacement detection. By using the device and the method provided by the invention, the problem that the measurement precision of a conventional method for measuring the magnetoconstriction coefficient cannot meet an ultra-precise measurement requirement is solved. The method provided by the invention comprises the following steps: enabling a plane reflecting mirror and a thickness-regardless thin glass plate to be mutually parallel and equal-height, enabling a distance d between the thickness-regardless thin glass plate and the reflecting surface of the plane reflecting mirror to be 20mm, and turning on a driving power supply of a polarizer, so that the polarizer begins carrying out simple harmonic vibration; and collecting an electric signal output by a photoelectric detector through a signal processing system, processing a collected signal, obtaining a distance variable quantity between the plane reflecting mirror and the thickness-regardless thin glass plate, and obtaining the magnetoconstriction coefficient of an iron-nickel alloy sample to be measured according to the distance variable quantity. The device and the method provided by the invention are applicable to the measurement of the magnetoconstriction coefficient of a ferromagnetic body.

The invention discloses a method for measuring magnetostriction constant by using multi-beam laser heterodynes, which relates to a method for measuring the magnetostriction constant of a material and is used for solving the problem of low precision in a traditional method for measuring the magnetostriction constant. The measuring method disclosed by the invention comprises the following steps of: firstly, carrying out alternating-current demagnetization on a piece to be tested and fixing the piece between two fixed rods; then turning on an H0 solid laser and driving a galvanometer scanner to start working; and finally, applying monotonically-raised direct current on the piece to be tested, wherein in the process of applying the current, a signal processing system is adopted to continuously acquire an electrical signal output by a photoelectric detector, acquire a length variation delta l of the piece to be tested and acquire the magnetostriction constant alpha equal to delta l / l according to the delta l. According to the method disclosed by the invention, on the basis of a laser heterodynes technology and a Doppler effect, length information to be tested is loaded in a frequency difference of a heterodynes signal and is demodulated by the signal to simultaneously obtain a plurality of length values to be tested; and the measurement precision of the length value to be tested can be improved by weighted average processing, and further, the measurement precision of the magnetostriction constant is improved.

A resonant image of using color light to excite surface plasma type consists of light source, modulation unit of incoming light angle, sample analysis unit, temperature control unit, detection unit, data collection and management unit. It is featured as applying composite-color light as excitation light source, using total reflection media-coupling to excite surface plasma of sensing film and to resonate with excited surface plasma for generating color image correlating to property of test sample.

The invention discloses a drop tower frictional wear testing device and method. The drop tower frictional wear testing device comprises a load loading mechanism, a static test sample clamping mechanism, a movable test sample clamping mechanism, a friction power device and a rack which is fixedly mounted in a drop cabin of a drop tower, wherein the load loading mechanism, the static test sample clamping mechanism, the movable test sample clamping mechanism and the friction power device are arranged in sequence. The drop tower frictional wear testing device has the advantages of simple structure, relatively high precision, stable structure and strong anti-impact capability; various index designs of the drop tower are completely referred and the device can be mounted in the drop cabin to carry out a micro-gravity drop tower frictional wear testing experiment; a micro-gravity environment can be relatively really simulated and influences, caused by micro-gravity, on frictional wear on the mechanism are explored; the blank of a mechanism frictional wear test under a current real micro-gravity environment is made up and influences, caused by the micro-gravity, on abrasion of a space mechanism are explored better.

The invention provides a trivalent aluminum ion detection reagent and method and particularly provides a trivalent aluminum ion detection reagent or kit containing an effective dose of silver nano-particles packaged by peptide compounds as well as a method for detecting trivalent aluminum ions by utilizing the reagent or the kit. The kit provided by the invention has the characteristics of rapidness in detection, simple and easy experiment condition, accurate result and the like.

The invention relates to a method for measuring the electrostriction coefficient of sinusoidal modulation multi-beam laser heterodyne second harmonic waves by utilizing a Doppler vibration mirror and particularly relates to a method for measuring electrostriction coefficient. The method is provided for solving the problems of low acquisition laser difference frequency signal quality and low signal processing computing speed of the existing laser heterodyne measuring technique in the measurement process of the electrostriction coefficient. In the method provided by the invention, the reflection surface of a second plane reflector is parallel to a thin glass plate; a vibration mirror starts simple harmonic vibration; an H0 solid laser is simultaneously turned on to adjust output voltage signals of a high-voltage power supply; simultaneously, a signal processing system continuously collects and processes electric signals which are output by a photoelectric detector to obtain the distance variable quantity between the second plane reflector and the rear surface of the thin glass plate, thereby obtaining the electrostriction coefficient of a piezoelectric ceramic pipe to be measured; and the method has the advantages that the quality of collected laser difference frequency signals is high and computation speed of signal processing computing is high. The method can be widely used in the fields of relative laser wind measuring radars and the like.

The invention provides a method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic and relates to a method for measuring Young modulus. The method is provided for solving the problem that when the existing laser heterodyne measurement method is adopted to measure the Young modulus, the collected laser difference frequency signals and the operation speed of signal processing are not ideal. In the method, a metal wire to be tested is hung on a fixed support to ensure that the metal wire is perpendicular to the reflecting surface of a plane mirror, a laser is opened while the vibrating mirror begins performing simple harmonic vibration; a signal processing system collects the signal output by a photoelectric detector to obtain the distance parameter of a thin glass plate and the plane mirror, the weight of weights is increased, the distance parameter of the thin glass plate and the plane mirror is obtained again, the extension length is obtained according to the obtained two distance parameters; and the Young modulus of the metal wire is obtained. The method has outstanding advantages that the collected laser difference frequency signals have high quality and the operation speed of signal processing is high.

The invention discloses a simulation device and method for a catalytic operation principle of artificial precipitation / snow enhancement. The simulation device comprises a high-voltage electrostatic dust removal device, an atomization chamber, a combustion chamber, a cloud chamber, a real-time image monitoring device and a display screen; the high-voltage electrostatic dust removal device is used for providing a clean airflow for the atomization chamber, and the airflow can transport water vapors generated by the atomization chamber to the cloud chamber; the atomization chamber is used for generating the clean water vapors; the combustion chamber is used for generating a silver iodide smoke agent by using silver iodide particles, and the silver iodide smoke agent is inserted into the cloudchamber through an injection hole in the outside of the cloud chamber; the cloud chamber includes a temperature monitor, a temperature controller and a snowfall particle sampling station, and the temperature controller is used for controlling the temperature of the cloud chamber; the snowfall particle sampling station is used for sampling generated ice crystal snows; the real-time image monitoringdevice is disposed in the cloud chamber, and is used for continuously collecting images in the cloud chamber and transmitting to the display screen for display.

The invention relates to an integrated tester for wave optics, wherein the tester is an integrated experiment teaching instrument. The tester is composed of a light source, an objective table, an optical screen, a vernier plate, and a dial. An optical screen track is welded to a support arm and is welded with the dial. When a handle is rotated, the dial and the optical screen track rotate together; an alpha vernier and a beta vernier are designed on the vernier plate in a diametric mode; and reticules of 0 degree to 360 degrees are marked on the periphery of the dial uniformly. When measurement is carried out, numerical values corresponding to the alpha vernier and the beta vernier are read and then averaging is carried out to obtain location of the optical screen, thereby achieving an objective of angle measurement. The tester is mainly used for demonstration of a two-slit interference experiment, a single-slit diffraction experiment, a circular hole diffraction experiment, an optical grating diffraction experiment as well as Malus law verification and brewster angle measurement and the like. The tester has advantages of convenient usage, clear experiment phenomena, convenient demonstration of optical path leakage, low cost, and precise measurement.

The invention provides a magnetic levitation driving device and method, and belongs to the technical field of magnetic levitation driving. The device comprises a driven module, a rail and a power supply, the rail is composed of a bottom plate, a left side plate and a right side plate and is U-shaped, a coil is arranged on the bottom plate of the rail, and two rubber magnetic strips are arranged atthe bottom of the bottom plate; the driven module is a square capable of entering the rail, two rectangular strong magnetic sheets are arranged on the upper portion of the square in the moving direction, a round strong magnetic sheet is arranged between the two rectangular strong magnetic sheets, two width compensation sheets and two electric brushes are arranged at the position, close to the four corners, of the bottom of the square, and the two width compensation sheets and the two electric brushes are distributed diagonally. When the device is used, the driven module is enabled to suspendon the track by mutual exclusion of the permanent magnets; and meanwhile, coils are arranged on the rail and are matched with a strong magnetic sheet arranged in the center of the driven module to realize electromagnetic driving. According to the invention, the driving unit can be effectively simplified, and magnetic suspension driving is realized in a simple manner.

The invention relates to an ideal gas polytropic process experiment instrument, the instrument adopts a gas pressure sensor to collect the gas pressure signal in the air container, the pressure signalis converted into electric signal by analog-digital conversion, and the electric signal is amplified by amplifier. Finally, the voltage fluctuation image which varies with the gas pressure is displayed on the digital oscilloscope, and the computer is used for measurement and control, so that the precision and reliability of the numerical acquisition process are achieved and the experiment is simple and convenient.

The invention relates to a measuring device and a measuring method for measuring a coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics, and relates to a measuring device and a measuring method for measuring the coefficient of metal linear expansion. The measuring device and the method aim to solve the problem that the quality of collected laser difference frequency signals and the computing speed of signal processing are nonideal in the process of measuring the coefficients of metal linear expansion by the conventional laser heterodyning measuring method. The measuring device comprises the following steps of: making a reflective surface of a second planar reflector parallel to a thin glass plate mutually; heating a metal rod to be measured uniformly, and opening an H0 solid laser simultaneously; and collecting the temperature inside an electrothermal furnace to acquire temperature variable quantity, collecting electric signals outputted by a photoelectric detector continuously by a signal processing system to acquire distance variable quantity between the second planar reflector and the thin glass plate,and acquiring the coefficient of metal linear expansion. The measuring device and the measuring method have the advantages of high quality of the collected laser difference frequency signals and highcomputing speed of the signal processing.

The invention discloses a device and method for testing the friction and wear of a falling tower ring block. The device comprises a loading mechanism, a block sample clamping mechanism, a ring sampleclamping mechanism, a friction power device and a frame fixedly arranged in a falling tower falling cabin. The frame is provided with a first support plate, a second support plate and a power device fixing base for installing the friction power device. The first support plate and the second support plate are arranged along a vertical direction. The device can be installed in the falling cabin, cancarry out a micro-gravity falling tower friction and wear experiment, can realistically simulate the micro-gravity environment and can explore the effect of micro-gravity on the friction and wear ofthe mechanism.

The invention belongs to the technical field of electrostatic spinning, and relates to a teaching demonstration device for the electrostatic spinning. The teaching demonstration device mainly comprises an electrostatic induction machine with a discharge rod being removed, an injector metal bracket, an injector filled with a spinning solution, a wire, a hollow stainless steel needle, electrified jet flows or spinning fibers, a metal net collector and a collector metal bracket, wherein one end of the injector metal bracket is welded with a metal bar at the top of a leyden jar in the electrostatic induction machine with the discharge rod being removed; the other end of the injector metal bracket is used for fixing the injector; one end of the wire is connected with the injector metal bracket; the other end of the wire is connected with the hollow stainless steel needle mounted on an injector needle tube; one end of the collector metal bracket is welded with a metal bar at the top of another leyden jar in the electrostatic induction machine with the discharge rod being removed; and the other end of the collector metal bracket is welded with the metal net collector. The teaching demonstration device is simple in structure, reliable in method and principle, low in fabrication cost, good in demonstration effect, high in safety and environmentally friendly; and demonstration conditions are easy to achieve.

The invention discloses a method for determining the content of glucose and xylose in a sugar solution and a tobacco extract. The determination method is an ultraviolet-visible spectrum method. When the sugar solution is analyzed, (1) standard solution preparation and (2) hydrolysis reaction are carried out; (3) chromogenic reaction; (4) establishing a standard curve or a general model; (5) sample detection; and (6) outputting a result. The method for analyzing the tobacco extract comprises the following steps: (1) preparing the tobacco extract; (2) hydrolysis reaction; (3) chromogenic reaction; (4) establishing a standard curve or a general model; (5) sample detection; and (6) outputting a result. The phloroglucinol color developing agent is adopted, the color developing step is carried out after the hydrolysis step, and the hydrolysis adopts the mixed acid of concentrated hydrochloric acid and glacial acetic acid under the normal temperature condition, so that the phloroglucinol method is used for detecting the glucose for the first time, the glucose and the xylose can be simultaneously determined, and when the phloroglucinol method is used for detecting the glucose and the xylose in a sugar solution and a tobacco leaching solution, the detection accuracy is greatly improved. Operation is rapid and simple, detection efficiency is high, and accuracy is high.

The invention discloses an energy conversion demonstration device for teaching. The demonstration device comprises a transparent container, a blade assembly, a power generation assembly and a light gathering assembly, wherein the transparent container is used for holding liquid and comprises a first outlet; the blade assembly comprises rotatable blades, and the rotatable blades are arranged at a place corresponding to the first outlet; the power generation assembly is connected with the blade assembly; and the light gathering assembly is used for gathering outside solar rays into a first beam and enabling the first beam to be radiated to the liquid in the transparent container. When the liquid is heated to a boiling state and turns into hot steam under irradiation of the first beam, the hot steam escapes from the first outlet, so that the ambient air around the first outlet is heated and expanded and moves upwards to drive the rotatable blades to rotate, and the rotatable blades rotate to drive the power generation assembly to generate power. Through the mode above, the provided demonstration device can visually reflect energy conversion.

The invention discloses a device and a method for measuring a Young modulus by means of linear frequency modulation multi-beam laser heterodynes second harmonics, belongs to the field of optics and aims to solve the problems of large error and poor measuring accuracy in the conventional method for measuring the Young modulus. Linear polarized light emitted by a linear frequency modulation laser obliquely enters a thin glass plate at an incident angle theta0; a light beam transmitted by the thin glass plate enters a first plane mirror, and is reflected and transmitted repeatedly between the thin glass plate and the first plane mirror which are parallel to each other to obtain multiple beams of light; the light beams repeatedly reflected and transmitted between the thin glass plate and the first plane mirror are converged onto the light-sensitive surface of a photoelectric detector together with reflected light on the front surface of the thin glass plate through a converging lens; the photoelectric detector outputs an electric signal to a signal processing system; the signal processing system is used for processing data in order to obtain the distances between the thin glass plate and the first plane mirror before and after the length change of a metal wire. The device and the method are suitable for measuring the Young modulus.

The invention relates to a liquid heat conduction test device which is made of high-temperature-resisting glass. The liquid heat conduction test device comprises a horizontal pipe (1) and two longitudinal pipes (3), wherein the horizontal pipe and the longitudinal pipes are vertically communicated, one longitudinal pipe is higher than the horizontal pipe and is provided with an opening. Scales for water are arranged on the part, higher than the horizontal pipe, of the longitudinal pipe, and the opening (1) is used for water feeding and discharging. Bases (4) are arranged at the lower ends of the two longitudinal pipes respectively. The distance between the horizontal pipe and the bases enables outer flames of an alcohol lamp to reach the horizontal pipe.

The invention discloses a method and a device for demonstrating an incomplete combustion experiment. The method comprises the following steps of: (1) taking a plate-like combustible and rolling up the combustible into a conical combustible barrel of which the diameters of the two ends are different; (2) wedging the part, which is shorter than or equal to half of the barrel, of the end of with the smaller diameter of the combustible barrel into a fireproof barrel of which the shape is matched with that of the part; (3) tilting the combustible barrel, wherein the end with the smaller diameter is arranged at a high position; and (4) igniting the end with the larger diameter of the combustible barrel, and igniting smoke when the smoke appears on the end with the smaller diameter of the fireproof barrel. The method is simple and feasible, visible in experiment phenomenon, vivid, interesting and persuasive and can be widely applied to chemical teaching of junior and high middle schools and science education popularization.

The invention discloses a Galileo cant demonstrator which has the advantages of remarkable phenomenon, simple structure and convenience for self-production. The Galileo cant demonstrator is necessary in study of Newton first law. In multiple years, a number of physics laboratories in middle schools do not have the Galileo cant demonstrator, and it is difficult to buy the Galileo cant demonstrator. The reasons for the problems are that firstly, a gliding trolley or ball cannot be guaranteed to run in the same vertical surface; and secondly, inclined surfaces at two sides are not connected smoothly, thus the trolley or ball loses a large amount of energy at the bottom end, large experimental errors are caused, the phenomenon are not obvious, and the abstract theory is more difficult to understand. The Galileo cant demonstrator adopts a PVC (polyvinyl chloride) wire clamping groove upper cover as the guide rail, and a glass ball instead of the moving trolley, therefore, the experimental phenomenon are extremely obvious, the whole device has the advantages of simple structure, convenience for drawing of materials, convenience for self-production or batch production, and capability of filling the gap of the apparatus in laboratories quickly. In addition, the Galileo cant demonstrator can be used for qualitative research of the theory of conversion of kinetic energy and gravitational potential energy of an object.

The invention provides a method and a device for simulating the water bloom floatation of blue algae, belonging to the field of water environment. The device comprises a reaction column, a light source and a heating sink, wherein the light source and the heating sink are arranged at the top of the reaction column; the top of the reaction column is sealed aseptically; the outer surface of the reaction column is provided with an aseptic aeration inlet, a culture liquid inlet, an aseptic stirring airflow inlet and a circulating water inlet; the middle of the reaction column is provided with a sampling inlet; and the lower part of the reaction column is provided with a circulating water inlet. The method comprises the following steps: carrying out the amplification culture of algae species; sterilizing culture fluid and a simulating device; placing the culture fluid in the reaction column; inoculating the blue algae into the reaction column for sealing; setting environmental conditions; and then, periodically sampling to analyze and observe the floating characteristics of the blue algae. The method enables the algae to grow in aseptic environments and can effectively simulate the water bloom of the blue algae. The device has simple structure, small size, easy operation, strong removability, indoor and outdoor use, corollary use with an illumination culture box, convenient manufacture and low cost.

A laser gyroscope teaching demonstration system comprises a rotation control module used for controlling rotation of a laser gyroscope, a laser module which can emit laser, a cavity adjusting module which is matched with the laser module to collimate the laser gyroscope reflector, an information acquisition module which is used for acquiring the image and photoelectric information of the laser module, and a control and display device which is used for displaying the information acquired by the information acquisition module and outputting control parameters to the rotation control module. The system further comprises a light combination system which is used for adjusting the position of a light combination prism on the laser gyroscope reflector, interference light is generated by laser emitted by the laser module, and image acquisition and data acquisition of the information acquisition module are more efficient and accurate. The system is highly integrated and can be used for demonstrating various working modes and parameters of the laser gyroscope, and the teaching effect is improved.

The invention provides a floating type left hand rule demonstrator. The buoyancy is utilized, a hanging wire is omitted, and in addition, the gravity is counteracted, so the phenomenon is more obvious. In order to solve the technical problems, the floating type left hand rule demonstrator adopts the technical scheme that two floating objects are respectively arranged in two water tanks fully filled with conducting liquid. One conducting wire is lapped on the two floating objects and passes through the floating objects to be in contact with liquid in the water tanks. A magnet is placed between the two water tanks, and one conducting wire is respectively led out from each water tank and is connected with a power supply. After the power supply is conducted, the electrified conducting wire receives the translation thrust under the effect of the magnetic field.

The invention provides a method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic and relates to a method for measuring Young modulus. The method is provided for solving the problem that when the existing laser heterodyne measurement method is adopted to measure the Young modulus, the collected laser difference frequency signals and the operation speed of signal processing are not ideal. In the method, a metal wire to be tested is hung on a fixed support to ensure that the metal wire is perpendicular to the reflecting surface of a plane mirror, a laser is opened while the vibrating mirror begins performing simple harmonic vibration; a signal processing system collects the signal output by a photoelectric detector to obtain the distance parameter of a thin glass plate and the plane mirror, the weight of weights is increased, the distance parameter of the thin glass plate and the plane mirror is obtained again, the extension length is obtained according to the obtained two distance parameters; and the Young modulus of the metal wire is obtained. The method has outstanding advantages that the collected laser difference frequency signals have high quality and the operation speed of signal processing is high.

The invention discloses a device and a method for measuring electrostrictive coefficients through linear frequency modulation multi-beam laser heterodyne and relates to the field of ultra-precise measurement. The device and the method for measuring the electrostrictive coefficients through the linear frequency modulation multi-beam laser heterodyne aim at solving the problem that the existing electrostrictive coefficient measuring method is low in measuring accuracy. An adjusting frame is used for fixing piezo-electric crystal with voltage to be measured; a second planar reflecting mirror is used for being fixed on one end surface of the piezo-electric crystal with the voltage to be measured; a thin glass plate and the second planar reflecting mirror are arranged in a parallel mode; laser sent out from a linear frequency modulation laser enters into the surface of the thin glass plate, the laser enters into the second planar reflecting mirror after being transmitted through the thin glass plate, and the laser is focused on the photosensitive surface of a photoelectric detector after being reflected through the thin glass plate. According to the device and the method for measuring the electrostrictive coefficients through the linear frequency modulation multi-beam laser heterodyne, the length variation amount of the piezo-electric crystal with the voltage to be measured is modulated within the frequency difference of intermediate frequency heterodyne signals, the length variation amount of a plurality of piezo-electric crystal with the voltage to be measured are obtained simultaneously due to measurement of the frequency difference, and the measuring error is 0.04 %. The device and the method for measuring the electrostrictive coefficients through the linear frequency modulation multi-beam laser heterodyne is applicable to ultra-precise measuring and detecting, device machining, laser radar system and the like.

The invention discloses a teaching experiment method for exploring the influence of inorganic salt on plant growth. The method comprises the following steps: a, culturing wheat seedlings, specifically, placing a towel into a basin, spraying tap water onto the towel, sowing a plurality of full wheat seeds of the same variety onto the towel, and germinating the wheat seeds in a dark environment at the temperature of 10+ / -1 DEG C for 2 weeks in a shading manner to obtain the wheat seedlings; b, manufacturing a culture basin, specifically, taking three containers of the same specification, pouringSprite, tap water and soil leachate which have the same volume into the containers respectively, and making corresponding marks to obtain the culture basin; c, transplanting the wheat seedlings intothe culture basin, specifically, c1, selecting 9 wheat seedlings with the generally same growth condition, dividing the wheat seedlings into three groups, and measuring the maximum plant height and the maximum root length of each group of wheat seedlings respectively; recording after culturing for 2 weeks; and comparing the final recording result with the result before culturing. The method has the characteristics of readily available raw materials, simple experiment equipment, high safety and strong persuasion of experiment results.

The invention discloses a multi-gas manufacturing device. The multi-gas manufacturing device comprises a gas generator, wherein the gas generator is provided with a reacting container, a liquid storage container and an auxiliary container. The multi-gas manufacturing device is characterized in that a sealing piston is arranged on the reaction container and communicated with an inlet and outlet, the inlet and outlet is communicated with a guide pipe and a branch pipe, the guide pipe and the branch pipe are connected with a main switch and an auxiliary switch respectively, the main switch is connected with the liquid storage container, and the auxiliary switch is connected with the auxiliary container. The multi-gas manufacturing device is simple in structure, convenient to manufacture, rapid to operate, safe, reliable, environmentally friendly, controllable and convenient to popularize.