65results about How to "Good teaching effect" patented technology

The invention discloses a formaldehyde-free animal specimen fixed liquid and a preparation method thereof, the formaldehyde-free animal specimen fixed liquid includes the following components: a biocide mildewcide, a protein denaturant, a polyol moisturizing agent and balance of water, and if the biocide mildewcide is in solid state, the mass concentration of the biocide mildewcide is 5-20 g/L, if the biocide mildewcide is liquid, the volume concentration of the biocide mildewcide is 1-2%; the volume concentration of the protein denaturant is 5%-40%; and the volume concentration of the polyol moisturizing agent is 2% to 10%. The formaldehyde-free animal specimen fixed liquid does not contain formaldehyde, and is non-volatile, and harmless to the human body; a fresh animal organ is washed with normal saline, and stored in the fixed liquid, a year later, the organ is not corrupted, free of mildew spot, and free of obvious color and shape change, the fixed liquid color has no obvious change, and the storage effect is good.

The invention discloses a water tank outflow volume measurement device. The water tank outflow volume measurement device comprises an experiment water tank, a liquid-gas conversion pressure measurement cylinder, a fluid differential pressure sensor and a microcomputer, wherein one side wall of the experiment water tank is provided with an outflow port; the liquid-gas conversion pressure measurement cylinder is arranged inside the experiment water tank, the bottom of the liquid-gas conversion pressure measurement cylinder is communicated with the inside space of the experiment water tank, the side wall of the liquid-gas conversion pressure measurement cylinder is provided with a gas outlet water drainage port, and the upper edge of the gas outlet water drainage port is flush with the middle axis horizontal plane of the outflow port; the fluid differential pressure sensor is connected with the liquid-gas conversion pressure measurement cylinder and is used for detecting the differential pressure between compressed air inside the liquid-gas conversion pressure measurement cylinder and external air; the microcomputer is connected with the fluid differential pressure sensor and is used for converting the differential pressure detected by the fluid differential pressure sensor into the outflow of the outflow port. The water tank outflow volume measurement device can conveniently and accurately measure the jet flow volume of orifices in a momentum experiment instrument and orifices and pipe mouths in a pipe mouth experiment instrument in a hydromechanics fundamental experiment in a digitalized mode.

The invention discloses a classroom quality evaluation system and method based on deep learning target detection, and the system comprises: a data obtaining module which is used for obtaining a real-time monitoring video stream of a classroom and a corresponding timestamp; a video preprocessing module that is used for preprocessing the real-time monitoring video stream; a detection and calculationmodule that is used for inputting a pre-trained video frame into the model according to the preprocessed real-time monitoring video stream so as to detect the attendance number and/or the head-up number of classroom monitoring video pictures; and a statistical evaluation module that is used for generating an evaluation result according to the attendance number and/or the head-up number. Accordingto the system, the deep learning target detection model is used for obtaining the real-time attendance condition and the head-up rate of a classroom; the multi-scale features are detected by using the feature pyramid to improve the detection effect, so that the good balance between the calculated amount and the accuracy is realized, the situation of the whole class can be counted, the teaching mode adjustment of teachers is facilitated, and the optimal teaching effect is realized.

The invention provides a multimedia interaction teaching system and teaching method. The system comprises a data collection module for collecting video streams, and is characterized in that an image matting module, an image synthesis module and an image transmission and real-time display module are further included, the image matting module is used for processing the collected video streams, extracting a moving object of interest and obtaining a foreground image, the image synthesis module is used for displaying the obtained foreground image at the forefront ends of all windows in a special-shaped window mode, and the image transmission and real-time display module is used for transmitting a special-shaped window, including the synthesized image, on a teacher machine to a student machine and displaying the special-shaped window in real time. According to the system, a teacher teaching picture is obtained through a camera, and transmitted to the image matting module in real time through the network to extract the foreground figure image, the extracted foreground figure image and courseware played on the teacher machine are overlapped in a special-shaped window mode through the image synthesis module, real-time display is carried out in the teacher machine, meanwhile, the synthesized image is transmitted to the student machine in real time through the network in the mode of the video streams, and a teacher goes deep into a computer.

The invention relates to demonstration equipment, in particular to flat parabolic motion demonstration equipment for physics teaching and aims at solving the technical problem of providing the flat parabolic motion demonstration equipment for physics teaching, enabling a student to intuitively observe the flat parabolic motion process and improving the teaching effect. According to the technical scheme, the flat parabolic motion demonstration equipment for physics teaching comprises a base, a mounting plate, bearing blocks, a screw rod, a nut, a servo motor, a first guide rail, a first guide sleeve, a placement plate, a first sliding rail, a first sliding block and the like; the mounting plate is arranged at the left part of the upper side of the base; the bearing blocks are arranged at the upper part and the lower part of the right side of the mounting plate respectively; and the screw rod is connected between the bearing blocks on the upper side and the lower side. The flat parabolicmotion demonstration equipment for physics teaching enables the student to intuitively observe the flat parabolic motion process and improve the teaching effect. By adopting the flat parabolic motiondemonstration equipment for physics teaching, a physics teacher can continuously change the height of the placement plate, so that a small ball is thrown out from different heights, the student observes flat parabolic motion falling distances of the small ball under different heights, understanding of the student to a knowledge point is enhanced, and the teaching effect is better.

The invention discloses a digital display flow meter for experiment teaching based on piezometer tube display and a measuring method thereof. The digital display flow meter comprises a pressure difference flow signal generator, two pressure measuring assemblies, a pressure sensor, a microcomputer data display instrument head, a fixed bracket, and a scale, wherein the pressure difference flow signal generator is used for generating pressure difference signals, each pressure measuring assembly comprises a pressure measuring cylinder, a communication positioning tube and a pressure measuring tube, the pressure sensor is used for detecting the pressure difference of compressed air in the two pressure measuring cylinders, the microcomputer data display instrument head is used for converting pressure signals detected by the pressure sensor into flow, the fixed bracket is used for installing the pressure measuring tube, and the scale is used for calibrating the liquid level of the pressure measuring tube. According to the device and the method, the fluid mechanics principle is comprehensively adopted in an innovative way to solve the display difficulty of experiment measurement; besides the device and the method are combined with a traditional pressure measuring tube and a modern measurement technology, have high precision and high display, and can be widely applied to the fluid mechanics experiment teaching instrument; through the device and the method, learning interests of students are motivated, and innovative consciousness of students are inspired; thus the device and the method are beneficial to cultivate innovation capability and have good teaching effect.

The invention discloses a demonstration device for etiquette teaching. The demonstration device comprises a base, wherein the lower end of the base is connected with rollers, the base comprises an operating panel and a rod body, the left side of the rod body is connected with a switch, a supporting rod is arranged on the rod body, the supporting rod and the rod body are connected in a threaded manner, the left end of the switch is connected with a power supply, a 360-degree rotary joint is arranged on the supporting rod, the rotary joint is connected with a demonstration board through a fixing bracket and a fixing joint, a demonstration window is arranged at the front of the demonstration board, the demonstration window is made of novel materials, a demonstration lamp is connected to the interior of the demonstration board, the side surface of the demonstration board is provided a jack, a cross rod is arranged at the upper end of the demonstration board, the cross rod is connected with the demonstration board by means of a vertical rod, and the demonstration board is fixed on the cross rod by means of a hook. The demonstration device for etiquette teaching is simple in structure and convenient to use, can be watched from multiple angles, brings convenience for the teacher to move the demonstration device, improves the teaching efficiency, and alleviates the teaching burden.

The invention relates to a space grid structure demonstration apparatus for displaying the visual persistence phenomenon. The space grid structure demonstration apparatus for displaying the visual persistence phenomenon includes a frame and a pallet rotation shafting, wherein the pallet rotation shafting includes a first rotation shaft and a pallet fixed on the first rotation shaft; the first rotation shaft is arranged on the frame through a first bearing pedestal; a space grid structure is arranged on the pallet; the space grid structure and the pallet coaxially rotate following the first rotation shaft; the space grid structure includes a group of planar attitude contour model units which form continuous action; the attitude contour model units are uniformly arranged at intervals in the rotation circumferential direction of the space grid structure; and the planes of the attitude contour model units are parallel to the radial direction of the pallet; the corresponding positions between the adjacent attitude contour model units are connected through a smooth connecting line to form the integrated space grid structure. The space grid structure demonstration apparatus for displaying the visual persistence phenomenon allows a visitor or a learner to understand the visual persistence phenomenon and the principle of animation and films more visually and vividly, and is suitable for long period of teaching.

The invention relates to a mobile terminal realization method for auxiliary teaching. The method comprises steps that S1, the basic posture decomposition movement information of yoga exercise is stored in a server, and a continuous time scope value corresponding to each basic posture decomposition movement is stored; S2, the user image information acquired through a mobile terminal is configured in the server in advance, the body movement framework information of the user is extracted from the user image information, and corresponding relationships between each user and the body movement framework information of the user are established; S3, yoga teaching materials are uploaded to the server, and content of the yoga teaching materials is divided into each piece of basic posture decomposition movement information according to the basic posture decomposition movement information of the yoga exercise of the step S1; and S4, the age, sex, weight and height information of the user is acquired, and corresponding relationships between the user and the body movement framework information of the user are acquired according to the age, sex, weight and height information of the user.

The invention provides a ship bow thruster teaching simulation operating system. The system comprises a hardware system and a software system. The hardware system comprises a console and a display screen. The console comprises a PC end, a signal conversion module, a control plate, an operation plate and a power supply indication module. The PC end is connected to the signal conversion module. Thesignal conversion module is connected to the control plate. The control plate is connected to the operation plate and the power supply indication module. The signal conversion module is simultaneouslyconnected to the display screen. The software system presents a signal output by the signal conversion module on the display screen through a programmable controller and 3D animation software. By using the ship bow thruster teaching simulation operating system, through a mode of controlling real objects, such as the console similar to equipment in a real ship and the like, a virtual control object is controlled; and operation cost is low and simultaneously a good teaching effect can be achieved.

The invention relates to a simulation internet of things teaching system, comprising a data sensor, an identification server, a communication gateway, a computer processing platform, a wireless sensing system, a computer operation terminal and a cellphone display terminal; the data sensor is arranged in the front of the communication gateway; the identification server is arranged in the front of the computer processing platform; the communication gateway is arranged in the front of the computer processing platform and converts information received by the data sensor into a signal capable of being identified by a computer; the wireless sensing system is arranged in the front of the computer operation terminal arranged at the rearmost end of the simulation internet of things teaching system; the cellphone display terminal is arranged behind the wireless sensing system. The simulation internet of things teaching system provided by the invention is formed by simulating a real internet of things environment, can realize instant and convenient information change and has the characteristic of good teaching effect.

A formula of sucking pig feed and a preparing method of the sucking pig feed are disclosed. The formula comprises 96-98% of main materials and 2-4% of core materials. The main materials comprise rice powder, wheat protein hydrolysate powder, import fishmeal, whey powder, whole milk powder, plasma protein powder, oil meal and glucose. The core materials comprise a sucking piglet trace element premix, water soluble powder of vitamins and electrolytes, composite enzyme, calcium dihydrogen phosphate, an acidity conditioning agent, zinc oxide, an additive named as 'runfuxiang' by the inventor, colistin sulfate and an additive named as 'xianyangling' by the inventor. The invention also provides the preparing method of the sucking pig feed. The method includes: weighing 96-98% by weight of the main materials, uniformly mixing components in the main materials, weighing 2-4% by weight of the core materials, uniformly stirring the core materials, adding the core materials into the uniformly mixed main materials, and mixing and stirring uniformly to obtain the sucking pig feed.

The invention discloses a teaching appliance capable of performing multi-degree-of-freedom adjustment on a board frame. The teaching appliance comprises a writing panel and a multi-degree-of-freedom adjusting bracket matched with the writing panel for use. The multi-degree-of-freedom adjusting support comprises a base, a lifting adjusting device and a supporting rod. A moving device is mounted atthe bottom of the base; the lifting adjusting device is mounted on the base; the supporting rod is rotatably and adjustably arranged on the lifting adjusting device through the rotating device; and the writing panel is arranged on the supporting rod in a universal adjusting mode through the universal adjusting device. Specifically, the lifting adjusting device comprises a lifting supporting base,a lifting movable plate and a driving assembly. The rotating device comprises a clamping base and a rotating plate. The writing panel comprises a panel device and a cleaning device matched with the panel device. By means of the teaching appliance capable of conducting multi-degree-of-freedom adjustment on the plate frame, adverse effects of environmental factors in the teaching process are weakened, and a better teaching effect is achieved.

The invention discloses a buoyancy experiment device used for physics teaching. The device comprises a fixed device, lifting devices and an experiment adjusting device. The lifting devices are arranged on both sides of the top of the fixed device. The fixed device comprises a base. A first fixed seat is arranged in the middle of the top of the base. An experiment beaker is arranged in the first fixed seat. A second fixed seat fixed on the top of the base is arranged on the right side of the first fixed seat. A water receiving cup is arranged in the second fixed seat. The top of the right end of the experiment beaker is communicated with the water receiving cup through a connecting tube. Fixed blocks are arranged on the left and right sides of the base. Each lifting device comprises a sleeve. The sleeves are fixed on the top of the fixed blocks. A gear is arranged in the middle in each sleeve. According to the invention, the device can prevent a spring dynamometer from shaking during anexperiment, so that measured experiment data are more precise; the device has the advantages of simple operation and convenient use, and is convenient for the classroom teaching of a teacher; and theteaching effect is better.

The invention provides a data sorting process dynamic implementation method for teaching demonstration. The data sorting process dynamic implementation method adopts a data number edit module, a sorting data random generation module, an initial data label generation module, an initial sorting data display module, a data storage and reading module, a data sorting module, an auxiliary label generation module, a forward comparison data label attribute modification module, a data exchange process dynamic display module, a sorted data label attribute modification module and a sorted data result display module. When the data sorting process dynamic implementation method is used for implementing explanation of a programming course data sorting algorithm, the specific data sorting process can be demonstrated dynamically, the data exchange sorting process is demonstrated dynamically in the sorting process according to presorting data generated randomly, and the sorted results are displayed after sorting. By applying the data sorting process dynamic implementation method, data sorting theoretical process can be demonstrated for the students vividly, the learning efficiency of students is increased, and good teaching effect is achieved.

The invention discloses a multifunctional three-dimensional combined transmission teaching aid. A three-dimensional combined transmission mechanism comprises a rotating wheel mechanism used for conveying a small ball, a simple four-bar mechanism capable of switching two routes, a vertical route switching rotating wheel, a horizontal route switching rotating wheel, a cam ejector used for ejecting the small ball into a collection basket, a crank rocker type lifting device used for lifting the small ball, a multi-rod lifting mechanism, a chain wheel type carrying and lifting device, a cam intermittent lifting device, a pulley block lifting device and a base. With the movement of the small ball in the three-dimensional combined transmission mechanism as the clue, the movement laws of various mechanical structures such as a link mechanism and a cam mechanism are shown in a three-dimensional mode. The three-dimensional combined transmission mechanism is composed of multiple modules, autonomous design, combination and connection of the transmission module are conducted by taking the movement speed and the movement height of the small ball into consideration for each module, the theory of the mechanical structure and practical teaching supplement each other, and an open and interactive teaching atmosphere is formed; the method for displaying various types of mechanical transmission in a three-dimensional mode is adopted, and the optimal demonstration and teaching effect of the combined transmission mechanism is achieved by regulating parts inside all the modules.

The invention provides experimental teaching and practical teaching process rebroadcasting equipment which ensures that a teacher can freely show details of experimental and practical operation to students, the learning interest of the students is improved, and the teaching effect is ideal. The equipment comprises a bracket and an experimental platform/practical training platform, and is characterized in that a tripod head supporting rod, a middle supporting plate, a control console supporting plate and a bottom plate are arranged on the bracket from the upper part to the lower part in sequence; the experimental platform/practical training platform is supported on the middle supporting plate; a tripod head is arranged on the tripod head supporting rod; a camera is installed on the tripod head; the lens of the camera aims at the experimental platform/practical training platform below the camera; a control console is supported on the control console supporting plate; the camera is connected with the control console through a data line; and the control console is connected with an external display screen through a video output line.

The invention belongs to the technical field of teaching, and particularly relates to a context simulation system for English informatization teaching. The context simulation system comprises a displayer, holographic glasses and earphones, wherein a telescopic bracket is arranged at one end of the displayer; a storage box is arranged at one end of a supporting device at the lower end of the displayer, and one end of the outer side of the storage box is electrically connected with a WiFi Bluetooth sensor; and the rear side of the displayer is fixedly connected with a lever bracket. By arranging a pressing and clamping device composed of a sliding groove, a limiting groove, a sliding rod, a reset spring, a pressing connecting rod, a limiting pin and a snap fastener, the context simulation system can rapidly limit the height of the adjusted displayer and is convenient and fast to use. By arranging a crank, a steering side gear, an internal-thread telescopic lantern ring, a transmission gear and a rack, lifting adjustment of the steering side gear is achieved, the steering side gear and a steering gear achieves the effect of changing the direction of rotation, the rack achieves the effect of driving telescopic screws at the two ends to ascend and descend at the same time, and the stability during lifting is guaranteed.

The invention discloses a multifunctional computer teaching device. The teaching device comprises a teaching desk and learning desks placed in a classroom, the teaching desk is provided with a computer host, an input device, a display, a writing board, a support and a pen holder are mounted in the surface of the teaching desk, an image recorder is arranged on the support, a writing pen used for writing on the writing board is inserted into the pen holder, and the computer host controls and is connected with the input device, the display and the image recorder; and each learning desk is internally provided with a vertical driving motor, the vertical driving motor is connected with an operation screen, a projector is mounted in the ceiling of the classroom, and a screen is arranged in the front side of the teaching room. The multifunctional computer teaching device has the advantages that multiple terminals can be connected with one computer, classroom teaching and bidirectional communication tutoring are realized, a good teaching effect can be achieved, a traditional blackboard-writing teaching means is realized needless of arranging a blackboard in the classroom, strong learning interests of students can be aroused via necessary blackboard writing, and the teaching efficiency is improved.

The invention discloses multimedia interaction method, device and equipment, and a storage medium. The method comprises the steps of calling a multimedia interaction component of a teaching platform;acquiring a control instruction by using the multimedia interaction component; performing information extraction based on the control instruction by utilizing the multimedia interaction component; anddisplaying or playing the extracted information through the multimedia interaction component. Multimedia interaction can be realized without the help of external equipment, so that the network teaching effect is better.

The invention discloses a computer-assisted teaching device, which comprises a No. 1 display, a mainframe box, a framework and a function box, wherein the framework is internally provided with a No. 2 display, the bottom part of the framework is provided with the function box and telescopic rods arranged on both sides of the function box, the function box is provided with a control box and a control switch arranged on one side of the control box, and the function box is connected with the mainframe box through a data line. The computer-assisted teaching device realizes synchronous display of the No. 1 display and the No. 2 display for teaching by connecting the mainframe box for a teacher to the function box, adjusts the heights of the telescopic rods through adjusting knobs so as to achieve the optimal effect, plays an audio file by means of audio playing equipment, facilitates the conveying and movement of the device by utilizing universal castors, is fixed by means of a brake device to enhance stability, is simple and reasonable in structure and convenient to use, can be conveyed and moved along with the teaching places at will, and achieves good teaching effect.

The invention relates to a mobile base station operation and maintenance learning system, which comprises a virtual reality module, a base station overall cognitive module, a base station equipment cognitive module, a base station data configuration module and a base station troubleshooting module, and is characterized in that the virtual reality module is used for performing virtual reality on a mobile base station through a virtual reality technology engine to acquire a virtual mobile base station; the base station overall cognitive module is used for teaching environmental information of the virtual mobile base station; the base station equipment cognitive module is used for teaching basic information of communication equipment manufacturers of the virtual mobile base station; the base station data configuration module is used for teaching the data configuration process of the virtual mobile base station; and the base station troubleshooting module is used for teaching the troubleshooting process of the virtual mobile base station. The technical scheme of the invention enables students to perform mobile base station operation and maintenance practicing and learning in the virtual environment through combining mobile base station operation and maintenance learning and the virtual reality, goods teaching effects are achieved, and defects of traditional teaching are effectively solved.

The invention discloses an intelligent teaching interaction system for colleges and universities, and belongs to the field of teaching interaction. The intelligent teaching interaction system for colleges and universities comprises student desks and a platform desk, and further comprises a first combined screen, a second combined screen, a display screen, a first processor, a second processor, projection curtains and a movable lifting device, wherein the first combined screen is hung on a wall; the second combined screen is hung on the wall and is used in combination with the first combined screen; the display screen, the first processor and the second processor are arranged on the platform desk; the projection curtains are arranged on the student desks in a lifting manner; and the movablelifting device is arranged on the top wall of a classroom in a sliding manner. For the intelligent teaching interaction system for colleges and universities, through the first combined screen and thesecond combined screen, the interaction and communication state between a teacher and students is displayed in front of the platform, so that the listening and watching of the other students are facilitated, the teaching effect is good, meanwhile, the projection curtains are arranged on the student desks in the classroom, the movable lifting device carries out movable picture recording for realizing interactive intelligent teaching, so that the communication and interaction among the different students can be realized, and the teaching effect is good.

The invention relates to a mechanical transmission unit, in particular to a mechanical transmission unit of an engineering drawing universal projection demonstration device. In order to solve the problems that the existing teaching aid is limited in demonstration content, the projection is restricted to LED display, the core idea of universal projection cannot be expressed appropriately, and inconvenience is brought for the teaching of engineering drawing in the aspect of universal projection, the mechanical transmission unit is provided. The mechanical transmission unit comprises a fixed plate (17) and a bottom plate (18), wherein the fixed plate (17) and the bottom plate (18) are arranged in parallel in the vertical direction, a projection mechanism (7) is arranged between the fixed plate (17) and the bottom plate (18), the upper part of the projection mechanism (7) can be positioned in a sliding manner by means of a plurality of universal wheels (16) installed at the lower end of the fixed plate (17), two sides of the projection mechanism (7) are in contact with a driving mechanism and an adjusting mechanism installed on the bottom plate (18), and the driving mechanism and the adjusting mechanism drive the projection mechanism (7) to rotate. The mechanical transmission unit is used for engineering drawing universal projection demonstration.

The invention discloses a multifunctional quadrilateral transformation device. The multifunctional quadrilateral transformation device includes a first wooden bar, a second wooden bar, a first rubber rib, a second rubber rib, a third rubber rib, a fourth rubber rib, bolts and nuts. The multifunctional quadrilateral transformation device is characterized in that one bolt passes through a first hole O and a second hole O; the first rubber rib, the second rubber rib, the third rubber rib and the fourth rubber rib pass through holes of the first wooden bar and the second wooden bar; and the first wooden bar and the second wooden bar can be hinged with each other since the first hole O and the second hole O of the first wooden bar and the second wood wooden bar are provided with the bolt and one nut; and the first wooden bar is rotatingly hinged with the second wooden bar. Different hole pitch being realized, different quadrangles can be obtained; the two wooden bars are just like Transformers; and thus, the multifunctional quadrilateral transformation device can be used in teaching and experiment demonstration. With the multifunctional quadrilateral transformation device adopted, profound principles can be embodied, and teaching tends to arouse students' interests. The multifunctional quadrilateral transformation device is advantageous in interesting property, inspiration, creativity, operational easiness, simple structure and few materials.

The invention provides a bar type pressure measuring device with a circuit electric measurement digital display. The device comprises more than two groups of pressure measuring components; each group of pressure measuring components comprises a pressure measuring tube, a communication positioning pipe arranged at the top of the pressure measuring tube, a pressure measuring pipe connected to the communication positioning pipe, a guide pipe communicated with the compressed air in the pressure measuring tube, a valve arranged on the guide pipe, a pressure difference sensor and a ruler used for calibrating the level in the pressure measuring tube. The two groups of pressure measuring components are connected to the pressure difference sensors through the valves. A traditional pressure measurement tube used for measuring the water head pressure in basic tests of hydrodynamics and hydraulics can be widely replaced with the pressure measurement device, the basic principle of the hydrodynamics is utilized ingeniously, the traditional measurement manner and the novel measurement manner are combined well, and the fine teaching effect is achieved.

The invention discloses a niter ice making machine for teaching. The niter ice making machine comprises a reaction box, wherein supporting legs are fixedly connected to two sides of the bottom of thereaction box correspondingly, an ice forming box is arranged in an inner cavity of the reaction box, the bottoms of two sides of the ice forming box are in contact with the top of the reaction box, abearing is fixedly connected to the axis of the bottom of the reaction box, an sleeve is movably connected to an inner cavity of the bearing, the top of the sleeve extends to the inner cavity of the reaction box, a transmission rod is fixedly connected to the top of the sleeve, first stirring rods are fixedly connected to the tops of two sides of the transmission rod correspondingly, and second stirring rods are fixedly connected to the bottoms of the two sides of the transmission rod correspondingly. According to the niter ice making machine, through cooperatively using the reaction box, theice forming box, the sleeve, the transmission rod, the first stirring rods, the second stirring rods, a water flowing hole, a plugging block, a driven gear, a driving gear, a motor, a water inlet pipeand a feeding pipe, water can be visually frozen into ice, so that students can observe visually, the teaching effect is significant, and thus a teacher can be better assisted in teaching.

The invention provides a snowfall flow simulation device for primary school science teaching demonstration. The device of the invention comprises a control electric box, a cloud model, a model support, a magnet and a tube. The tank body is rectangular in shape, and a cover plate is rotatably arranged at the middle position of the rear sidewall of the tank body. The cover plate is horizontally corresponding to the front and rear sides of the model support at the lowest height position. The middle position of the right sidewall of the tank body is provided with the control electric box. Two axial flow fans are symmetrically fastened at the top positions of left and right sidewalls of the tank body. The two axial flow fans are electrically connected with a switch button on the control electric box. Two limit switches are supported and installed at intervals on the left internal wall of the tank body. The two limit switches and a positive and negative relay inside the control electric boxare connected in series and charged with electricity, and the highest and lowest suspension heights of the model support are further controlled. With the arrangement of two sieve tanks, the two sievetanks can be removed and alternately used so as to avoid the step of collecting falling plastic snow. The device of the invention is convenient to use.

The invention discloses a Chinese language learning device for a student and a using method thereof.The Chinese language learning device comprises a power supply, a central processing chip, a storage device, a display device, a pressure sensing device, a data interface, a working switch, a voice receiving device, a letter card group and a loudspeaker, wherein the working switch is connected with the power supply, the letter card group comprises at least three sets of Chinese phonetic alphabet cards, each set of Chinese phonetic alphabet cards includes vowel cards and initial consonant cards, each card is provided with a front side and a back side, Chinese phonetic alphabets are printed on the front sides, and protruding structures are arranged in the areas, corresponding to alphabets, of the back sides.The central processing chip is further connected with the working switch, the pressure sensing device, the storage device, the display device and the loudspeaker.The central processing chip is further provided with a checking attendance memory mechanism and a teaching test mechanism.The Chinese language learning device achieves teaching through lively activities, relates to multiple learning stages, is a device capable of constantly deepening the impression on learning contents of the student during teaching, performing dynamic update and initiatively performing interaction with the student and has a god teaching effect.

A remote sensing spatial information teaching experiment system comprises a host, a touch screen display, a database, an electronic whiteboard, and a stereo projector, wherein the host is respectivley connected with the touch screen display, the database, the electronic whiteboard and the stereo projector. Image resources become geography teaching resources, three-dimensional simulation topography can be displayed, all-angle interactive operation can be carried out, and teaching effects are good.