Half-life period demonstration device and demonstration method

Abstract

The invention relates to the technical field of science popularization demonstration, in particular to a half-life period demonstration device and a half-life period demonstration method. The device comprises a base body, a plurality of vertically-arranged demonstration cavities are formed in the table top of the base body, magnetic jumping blocks are arranged in the demonstration cavities, the visual states of the top faces and the bottom faces of the magnetic jumping blocks are different, and the magnetic pole directions of the top faces and the bottom faces of the magnetic jumping blocks are opposite; an electromagnet is arranged under each magnetic jumping block, all the electromagnets can be controlled by a controller to switch the magnetic pole direction, and when the controller controls part of the electromagnets to switch the magnetic pole direction, the part of the electromagnets and the bottom faces of the magnetic jumping blocks are magnetically repelled to drive the magnetic jumping blocks to jump and turn over. Therefore, radioactive decay of part of atomic nucleuses in the elements is demonstrated. According to the invention, by combining the action of a mechanical structure, the nuclear decay process and rule can be dynamically and visually displayed, so that the double problems of non-visual teaching and weak science popularization display can be solved.

Description

Technical Field

[0001] This invention relates to the field of science popularization demonstration technology, specifically a half-life demonstration device and method. Background Technology

[0002] Half-life is a core concept in the decay process of radioactive nuclides, referring to the time required for the number of radioactive nuclei to decay to half of the initial value.

[0003] In the realm of classroom teaching, traditional methods primarily rely on static charts, mathematical formulas, or computer software simulations for explanation. These methods lack intuitive and dynamic physical demonstrations, making it difficult for students to establish a unified physical picture of "random individual events" and "deterministic statistical laws," leading to comprehension difficulties and keeping learning at an abstract level.

[0004] In the fields of science and technology museums, museums, and various themed science popularization exhibition halls, there is currently a lack of dedicated interactive exhibits that can effectively demonstrate the principle of half-life. Existing science popularization devices mostly focus on intuitive phenomena such as mechanics and optics. For microscopic and abstract concepts such as nuclear physics, explanations are often limited to graphic panels or video presentations. The presentation methods are monotonous, lack interactivity, and have weak appeal, failing to provide visitors, especially young people, with an immersive cognitive experience and a lasting impression. Therefore, this issue urgently needs to be addressed. Summary of the Invention

[0005] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a half-life demonstration device and demonstration method, which can dynamically and visually display the nuclear decay process and law by combining the action of mechanical structure, so as to solve the dual problems of unintuitive teaching and weak popular science demonstration.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A half-life demonstration device includes a substrate with multiple vertically arranged demonstration cavities formed on the substrate's platform. Magnetic jumping blocks are arranged inside the demonstration cavities. The top and bottom surfaces of the magnetic jumping blocks have different visual states, and the magnetic pole directions of the top and bottom surfaces of the magnetic jumping blocks are opposite to each other. An electromagnet is arranged directly below each magnetic jumping block. All electromagnets can be controlled by a controller to switch the magnetic pole direction. When the controller controls some electromagnets to switch the magnetic pole direction, the magnetic repulsion between those electromagnets and the bottom surface of the magnetic jumping block drives the magnetic jumping block to jump and flip, thereby demonstrating the radioactive decay of some atomic nuclei in an element.

[0007] As a further aspect of the present invention: the magnetic jump block is a cube, and the top and bottom surfaces of the magnetic jump block are formed by any two opposite faces of the cube. The demonstration cavity is a cylindrical cavity, and the side length of the cube is half the diameter of the cylindrical cavity.

[0008] As a further aspect of the present invention: the top and bottom surfaces of the magnetic jumping blocks are different in color and / or pattern to create different visual states.

[0009] As a further embodiment of the present invention: multiple positioning tubes with top openings are fixed on the base platform, the inner cavity of the positioning tubes constitutes the demonstration cavity, an electromagnet is installed at the bottom end of the positioning tubes, and tempered glass covering all the positioning tubes is fixed on the base.

[0010] As a further embodiment of the present invention: a start button for energizing the control device is installed on the platform of the substrate, and a knob is also installed on the platform of the substrate. The output end of the knob is connected to a controller that controls the switching of magnetic poles of the electromagnet. The knob constitutes an operating part for selecting the type of half-life element on the controller.

[0011] As a further aspect of the present invention: a display screen is mounted on the substrate.

[0012] The demonstration method, applied to the aforementioned half-life demonstration device, includes the following steps: S1. Control all electromagnets to the first magnetic pole state, record all electromagnets as being in the undecayed state, and define the duration of the decay period. S2. Identify the electromagnets in the undecayed state from all electromagnets and use them as candidate electromagnets for the current period. Determine the number M of electromagnets that need to switch to the decayed state in the current period according to the predefined decay sequence. S3. Based on a timer, a random seed is used to randomly sort M target electromagnets, and the time interval between random adjacent sorts is used. S4. Control the M target electromagnets to switch their magnetic pole states from the first magnetic pole state to the second magnetic pole state in a randomly obtained order and time interval, and update the switched electromagnets to the decayed state in the state record. S5. Repeat steps S2-S4 to start the decay of the next cycle until only one electromagnet remains, which is the undecayed state. S6. Continue with the last cycle, and within the time interval of this cycle, randomly select a time node based on the random seed to switch the electromagnet to the second magnetic pole state. The demonstration is now complete.

[0013] As a further aspect of the present invention: the predefined decay sequence in step S2 is configured such that the number of electromagnets that need to be switched to the decayed state in the current period is based on half of the number of undecayed electromagnets remaining before the start of the current period, rounded up or down.

[0014] As a further aspect of the present invention: step S1 further includes receiving a user's selection instruction for the target element type, and determining the duration of the decay period based on the selection instruction.

[0015] As a further aspect of the present invention: step S5 further includes, after the previous decay cycle is completed, indicating the number of decay cycles by the indicator module, and when the next cycle needs to be demonstrated, starting the next cycle immediately or after waiting for a delay interval.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This application utilizes the magnetic drive combination of electromagnet pole switching and magnetic jump blocks with opposite poles on the top and bottom surfaces to transform the abstract microscopic random event of "atomic nuclear decay" into a visually impactful mechanical action of "magnetic jump blocks jumping and flipping." By controlling a portion of the electromagnets to switch their pole directions, the magnetic field generated by these electromagnets interacts with the magnetic field of the corresponding magnetic jump block's bottom pole (changing from attraction to repulsion), generating an upward thrust that drives the magnetic jump block to jump upward within the demonstration cavity and, aided by the attraction force with the top surface, completes a mid-air flip. After the magnetic jump block flips, its visual appearance to the observer changes accordingly, thus intuitively simulating the decay event of a single atomic nucleus. In practical implementation, by controlling the movement of a specific number of electromagnets within a specific time period, the half-life phenomenon, where half of a certain number of atomic nuclei decay, can be macroscopically demonstrated. This makes this application not only a high-quality teaching tool for school classrooms, overcoming the abstract nature of traditional teaching methods that rely on charts; it can also become an interactive exhibit that attracts the public in science museums, museums, and themed exhibition halls. Its vivid physical movements are more realistic and memorable than screen animations, effectively stimulating the scientific interest of the public, especially teenagers.

[0017] 2. This application introduces random sorting and time intervals into the demonstration method, ensuring that the decay period of the same element is consistent in each demonstration. However, the specific electromagnet used to demonstrate decay (20) and the specific demonstration time of this part of the electromagnet are uncertain. This profoundly demonstrates the "one certainty and two uncertainties" in the radioactive decay process. The certainty is that the duration of each decay period of the same element is the same. The two uncertainties are: in a decay period, it is uncertain which atomic nuclei decay, and it is uncertain at what point in time the decaying atomic nuclei will decay. This avoids mechanically timed triggering, more realistically simulates the radioactive decay process in nature, and enhances the scientific rigor and persuasiveness of the demonstration.

[0018] 3. The precise ratio between the side length of the cube magnetic jump block and the diameter of the cylindrical cavity ensures a high success rate and regularity in each jump and flipping action, making it very suitable for long-term, high-frequency, unattended automatic loop demonstrations in exhibition hall environments with a low failure rate.

[0019] 4. Through the vivid colors, patterns, or lighting contrasts (such as LED light strips) on the top and bottom surfaces of the magnetic jump blocks, each "decay" event is clearly visible even when viewed from a distance. This design is particularly suitable for viewing by crowds in exhibition hall environments, quickly conveying core information and attracting attention.

[0020] 5. The fully enclosed design with positioning round tubes and tempered glass on top not only ensures high safety, preventing accidental contact or loss of parts, but also provides a clean overall appearance, facilitates modular assembly, and is easy to maintain.

[0021] 6. Through knobs and displays, users can independently select elements with different simulated half-lives. This interactive selection function greatly enhances the participation and interest in the exhibits, transforming the visit from passive viewing to active exploration. The displays show real-time information such as the remaining number of atoms, period number, and simulated element information, providing self-explanatory graphic and textual explanations for the exhibits. This reduces reliance on external explanatory panels, making the communication of scientific principles more direct and efficient, aligning with the design trend of modern self-service exhibition halls. Attached Figure Description

[0022] Figure 1 This is a partial cross-sectional view of the demonstration device in this invention.

[0023] Figure 2 This is a top view of the demonstration device in this invention.

[0024] Figure 3 This is a side view of the structural diagram of the demonstration device in this invention.

[0025] Figure 4 This is a flowchart illustrating the workflow of the demonstration method in this invention.

[0026] In the diagram: 10, substrate; 11, tempered glass; 20, electromagnet; 30, magnetic jump block; 31, permanent magnet; 40, positioning tube; 50, knob; 60, start button; 70, display screen. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] For ease of understanding, the specific structure and operation of the present invention will be further described below with reference to the accompanying drawings: The structure of the demonstration device of this invention is shown in reference. Figure 1-3 As shown, its main structure includes a square base 10 and magnetic jumping blocks 30 on it for demonstrating atomic nuclear decay.

[0029] On the top platform of the base 10, multiple vertically arranged demonstration cavities are formed in a matrix pattern. Specifically, such as... Figure 1 As shown, multiple transparent or semi-transparent positioning tubes 40 with top openings are fixed to the platform of the base 10 via slots or screws. The inner cavities of these positioning tubes 40 directly constitute the aforementioned demonstration chamber. Electromagnets 20 are installed on the outside of the bottom end of each positioning tube 40 (or can be embedded in the bottom), facilitating modular assembly of each demonstration chamber structure. Finally, a large tempered glass panel 11 is fixed to the platform of the base 10 via a frame, covering all the positioning tubes 40. The tempered glass panel 11 provides safety protection, preventing the magnetic jumping blocks 30 from accidentally jumping out, while not obstructing observation, resulting in a neat, safe, and durable overall device.

[0030] Furthermore, such as Figure 1 As shown, a movable magnetic jumping block 30 is provided inside each demonstration cavity. The top and bottom surfaces of the magnetic jumping block 30 are set to different visual states, such as the top surface being painted red and the bottom surface being painted blue, and / or the top surface being a pattern showing vitality and the bottom surface being a pattern showing decay, thereby forming different visual states.

[0031] In addition, such as Figure 1 As shown, to achieve the driving function, the magnetic jump block 30 can be made of magnetic material itself, or a permanent magnet 31 can be embedded inside the magnetic jump block 30 near the top and bottom surfaces, respectively. When installing these two permanent magnets 31, their outward-facing magnetic poles are set to be opposite to each other. For example, the N pole of the top permanent magnet 31 faces outward, and the S pole of the bottom permanent magnet 31 faces outward; or vice versa. Alternatively, a single permanent magnet 31 can be fixed inside the cavity of the magnetic jump block 30, with its two poles located at the top and bottom surfaces of the magnetic jump block 30, respectively.

[0032] Directly below each magnetic jump block 30, an electromagnet 20 is fixedly installed. All electromagnets 20 are electrically connected to the controller via a circuit to receive control signals. One of the core functions of the controller is to independently control each electromagnet 20, switching the direction of its magnetic field pole (i.e., the polarity of the electromagnet 20 toward the magnetic jump block 30) between the first magnetic pole state (e.g., N pole upward) and the second magnetic pole state (e.g., S pole upward).

[0033] The basic demonstration principle is as follows: Initially, all electromagnets 20 are uniformly set to the first magnetic pole state by the controller, assuming they are attracted to the bottom surface of the magnetic jump block 30. The magnetic jump block 30 is stably placed at the bottom of the cavity, displaying the top surface (e.g., red). When the controller selects a portion of the electromagnets 20 according to a preset program and switches their magnetic pole direction to the second magnetic pole state, the magnetic field of these electromagnets 20 will immediately repel the corresponding magnetic poles on the bottom surface of the magnetic jump block 30 (assuming they are initially attracted, but after switching they become like poles repelling each other). This suddenly generated magnetic repulsion force will drive the magnetic jump block 30 to jump upwards. During the jump, due to the force and cavity constraint, the magnetic jump block 30 will flip. When it falls back, the side that was originally facing down and had a different visual state (e.g., the blue side) will then be displayed facing upwards. This process intuitively simulates the random decay event of a single atomic nucleus. By controlling exactly half of the electromagnets 20 to switch their magnetic poles and drive the magnetic jump block 30 to flip in this way within a set "half-life" period, the half-life phenomenon of radioactive elements can be demonstrated macroscopically and statistically.

[0034] Based on the above, such as Figure 1 As shown, as a preferred structure to ensure reliable flipping, the magnetic jump block 30 in this embodiment is designed as a cube. Its "top" and "bottom" surfaces are formed by any two opposite faces of the cube. The cube structure makes it easier to ensure the magnetic jump block 30 has a complete surface. Correspondingly, the demonstration cavity is specifically a cylindrical cavity, and the side length of the cube is precisely designed to be half the diameter of the cylindrical cavity. This proportional relationship ensures that the cube has sufficient space within the cylindrical cavity to complete the flipping action without excessive shaking, resulting in a clear orientation after flipping and a clear and stable demonstration effect.

[0035] Based on the above, such as Figure 2 As shown, for ease of user operation, a start button 60 and a knob 50 are installed on the tabletop or side of the substrate 10. The start button 60 is connected to the controller. Normally, the device is in a sleep state. Pressing the start button 60 wakes the device or starts a new demonstration. The knob 50 serves as a user input device; its output is connected to the controller. Rotating the knob 50 allows switching between different settings, each corresponding to a preset radioactive element (such as carbon-14, iodine-131, uranium-238, etc.). The controller receives the signal from the knob 50, thus forming an operation unit for selecting the half-life element and calling the corresponding half-life time parameter for the demonstration.

[0036] like Figure 2 and Figure 3As shown, to further enhance the presentation of teaching information, a display screen 70 (such as an LCD or OLED screen) is also installed on the tabletop or front of the substrate 10. This display screen 70 is connected to the controller and is used to display textual and graphical information in real time, such as the name of the element being simulated, the number of half-lives, the number of remaining undecayed atomic nuclei, and the demonstration status, making the demonstration process more scientific and interactive.

[0037] The demonstration method applied to the above demonstration device is as follows: Figure 4 As shown, the specific steps include: S1. Control all electromagnets 20 to the first magnetic pole state, record all electromagnets 20 as being in the undecayed state, and define the duration of the decay period. Specifically, defining the duration of the decay period involves receiving the user's selection instruction for the target element type and determining the duration of the decay period based on the selection instruction.

[0038] S2. Identify the electromagnets 20 in the undecayed state from all the electromagnets 20, and use them as candidate electromagnets 20 for the current period. According to the predefined decay sequence, determine the number M of electromagnets 20 that need to be switched to the decayed state in the current period. Specifically, the predefined decay sequence in step S2 is configured as follows: the number of electromagnets 20 that need to be switched to the decayed state in the current period is based on half of the number of undecayed electromagnets 20 remaining before the start of the current period, rounded up or down.

[0039] S3. Based on the random seed of the timing clock, the random sorting of M target electromagnets 20, and the time interval between random adjacent sortings.

[0040] S4. Control the M target electromagnets 20 to switch their magnetic pole states from the first magnetic pole state to the second magnetic pole state in a randomly obtained order and time interval, and update the switched electromagnets 20 to the decayed state in the state record.

[0041] S5. Repeat steps S2-S4 to initiate the next decay cycle. Specifically, after the previous decay cycle is completed, the indicator module indicates the number of decay cycles that have occurred, and when the next cycle needs to be demonstrated, the next cycle is initiated immediately or after a delay interval; until only one electromagnet 20 remains in the undecayed state.

[0042] S6. Continue with the last cycle, and within the time interval of this cycle, randomly select a time node based on the random seed to switch electromagnet 20 to the second magnetic pole state. The demonstration is now complete.

[0043] The following instructions, using actual parameters, further elaborate on the above demonstration method: Command received: The user selects "Uranium-238" using knob 50. The controller receives the command, retrieves the corresponding half-life ratio parameter from the storage unit, and sets the duration of each demonstration cycle to 12 seconds.

[0044] Initialization: The controller sets all electromagnets 20 to state A (e.g., N pole upwards) and creates a state array in memory, marking all entries as "0" (undecayed). Display screen 70 shows "Element: Uranium-238, Total: 96, Remaining: 96, Period: 0".

[0045] First cycle begins: Quantity determined: The current remaining undecayed number N = 96. According to the definition of half-life, the number of triggers required this cycle is M = N / 2 = 48. The controller randomly selects 48 indices from the 96 indices marked "0" as the targets for this batch.

[0046] Random scheduling: Using the system real-time clock (RTC) as a random seed, a random permutation order of 1-48 is generated for these 48 target indices. At the same time, an interval time (the sum of which is less than the cycle length of 12 seconds) is randomly generated for each of the 1st to 2nd actions, the 2nd to 3rd actions, ... the 47th to 48th actions.

[0047] Demonstration: The controller initiates a cycle timer. At second t1 (t1 being the first random interval) after the timer starts, the first target electromagnet 20 is triggered (switching its magnetic poles to state B, i.e., S pole facing upwards). The corresponding magnetic jump block 30 jumps and flips, and the "remaining" count on display 70 is decremented by 1. At second t1+Δt1 (Δt1 being the second interval), the second target electromagnet 20 is triggered... and so on, until all 48 actions are completed within 12 seconds. Each time an action is triggered, the corresponding state flag in memory is updated to "1" (decayed).

[0048] Cycle End: When 12 seconds have elapsed, display 70 updates "Cycle: 1, Remaining: 48". At this point, approximately half of the magnetic jump blocks 30 have revealed the other side.

[0049] Subsequent cycle: Enter the second cycle. The controller only focuses on the 48 electromagnets (20) with a state of "0". Calculate M = 48 / 2 = 24. Randomly select 24 targets and randomly sort and space them.

[0050] Repeat the "Execute Demonstration" process, triggering 24 times within 12 seconds. At the end of the cycle, update to display "Cycle: 2, Remaining: 24".

[0051] This process repeats until the third cycle (12 triggered, 12 remaining), the fourth cycle (6 triggered, 6 remaining), the fifth cycle (3 triggered, 3 remaining), and the sixth cycle (M=3 / 2=1.5, rounded up, 2 triggered, 1 remaining).

[0052] End Judgment: When the remaining number of "undecayed" blocks is 1, the controller determines that it is entering the final stage. It can randomly select a time point within the next 12-second cycle to trigger the last electromagnet 20. After the last magnetic jump block 30 flips over, the display screen 70 displays "Demonstration End" or directly plays a completion prompt tone.

[0053] The above demonstration method incorporates random sorting and time intervals, ensuring that the decay period of the same element remains consistent across demonstrations. However, the specific electromagnet 20 used for demonstrating decay and its demonstration time are uncertain. This method profoundly illustrates "one certainty and two uncertainties" in the radioactive decay process: the certainty is that the duration of each decay period for the same element is identical; the two uncertainties are: which atomic nuclei decay within a decay period and at what time. This avoids mechanically timed triggering, more realistically simulating the natural radioactive decay process, and enhancing the scientific validity and persuasiveness of the demonstration.

[0054] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0056] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A half-life demonstration device, characterized by, The base (10) is provided with a plurality of vertically arranged demonstration cavities on the table top, and a magnetic jump block (30) is arranged in each demonstration cavity. The top surface and the bottom surface of the magnetic jump block (30) have different visual states, and the magnetic pole directions of the top surface and the bottom surface of the magnetic jump block (30) are opposite to each other. An electromagnet (20) is arranged below each magnetic jump block (30). All electromagnets (20) can be controlled and switched in magnetic pole direction by a controller. When the controller controls part of the electromagnets (20) to switch the magnetic pole direction, the magnetic jump block (30) is driven to jump and turn over by the magnetic repulsion between the part of the electromagnets (20) and the bottom surface of the magnetic jump block (30), so as to demonstrate the radioactive decay of part of atomic nuclei in the element.

2. The half-life demonstration device of claim 1, wherein, The magnetic jump block (30) is a cube, and any two opposite surfaces of the cube form the top surface and the bottom surface of the magnetic jump block (30). The demonstration cavity is a cylindrical cavity, and the length of the side of the cube is half of the diameter of the cylindrical cavity.

3. A half-life demonstration apparatus according to claim 1 or 2, wherein The top surface and the bottom surface of the magnetic jump block (30) have different colors and / or patterns to form the different visual states.

4. The half-life demonstration apparatus of claim 1 or 2, wherein A plurality of open-top positioning circular tubes (40) are fixed on the table top of the base (10), and the inner cavities of the positioning circular tubes (40) form the demonstration cavities. The electromagnets (20) are installed at the bottom ends of the positioning circular tubes (40). A tempered glass (11) is fixed on the base (10) to cover all the positioning circular tubes (40).

5. The half-life demonstration apparatus of claim 1 or 2, wherein A start button (60) for controlling the power-on wake-up of the control device is installed on the table top of the base (10). A rotary knob (50) is also installed on the table top of the base (10). The output end of the rotary knob (50) is connected with the controller for controlling the electromagnets (20) to switch the magnetic pole. The rotary knob (50) constitutes an operation part for selecting the type of element with half-life on the controller.

6. The half-life demonstration apparatus of claim 1 or 2, wherein A display screen (70) is installed on the base (10).

7. A demonstration method applied to the half-life demonstration device according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1, controlling all electromagnets (20) to be in a first magnetic pole state, recording that all electromagnets (20) are in an undecayed state, and defining the time length of a decay period; S2, identifying electromagnets (20) in the undecayed state from all electromagnets (20) as candidate electromagnets (20) in the current period, and determining the number M of electromagnets (20) that need to be switched to the decayed state in the current period according to a predefined decay sequence; S3, randomly selecting the order of M target electromagnets (20) based on the random seed of a timing clock, and randomly selecting the time interval between adjacent orders; S4, controlling the M target electromagnets (20) to switch their magnetic pole state from the first magnetic pole state to a second magnetic pole state in the order and time interval obtained randomly, and updating the switched electromagnets (20) to the decayed state in the state record; S5, repeating steps S2-S4 to start the decay of the next period until only one electromagnet (20) is in the undecayed state; S6, continuing the last period and randomly selecting a time node within the time interval of the period based on the random seed to switch the electromagnet (20) to the second magnetic pole state, and the demonstration is completed at this time.

8. The presentation method of claim 7, wherein, The predefined decay sequence of step S2 is configured such that the number of electromagnets (20) to be switched to the decayed state in the current cycle is rounded up or down based on half of the number of electromagnets (20) remaining undecayed before the start of the current cycle.

9. The presentation method of claim 7, wherein, Step S1 further comprises receiving a selection instruction of a target element type from a user and determining the length of the decay cycle according to the selection instruction.

10. The presentation method of claim 7, wherein, Step S5 further comprises indicating the number of cycles that have decayed after the completion of the last decay cycle by the indicating module and starting the next cycle immediately or after a delay interval when a demonstration of the next cycle is required.

Images