Rotating anode X-ray bulb tube simulation device

Abstract

The invention relates to the technical field of medical teaching, in particular to a rotating anode X-ray bulb tube simulation device, which is used for simulating the rotating process of an anode of an X-ray bulb tube, the heating process of a cathode filament and the exposure process of X rays, and comprises an X-ray bulb tube with an anode module and a cathode module; the power conversion module is electrically connected with an alternating current power supply; the cathode adjusting module is arranged between the power supply conversion module and the cathode module; the exposure simulation module is electrically connected with the cathode adjustment module; the multi-gear control module is electrically connected with the anode starting module and the exposure simulation module; and the exposure simulation module is started to operate after receiving a trigger signal of the multi-gear control module. According to the rotating anode X-ray bulb tube simulation device provided by the invention, after the anode module is rotated, the exposure simulation module is used for replacing the exposure process of X-ray bulb tube parameter X rays, so that an operator can directly observe the working operation principle of the rotating anode X-ray bulb tube in a close range under the condition of ensuring safety, and the teaching quality is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical teaching, and in particular to a rotating anode X-ray tube simulation device. Background Art

[0002] X-ray machine is a device that produces X-rays. It is mainly composed of X-ray tube device, high voltage generating device, control device, peripheral device, etc. As a medical imaging device, X-ray machine plays an important role in clinical practice. In teaching, in order to intuitively reflect the working principle of X-ray tube device, a simulation device is usually used to simulate the X-ray tube device and demonstrate its working principle.

[0003] However, the simulation experiment of the existing X-ray tube device still needs to be connected to high voltage before it can be operated. For example, the patent document with the announcement number CN203204925U discloses an X-ray machine circuit teaching board, including an X-ray tube, a fluorescent board, a filament voltage supply circuit and a high-voltage supply circuit, wherein the X-ray tube is a high-vacuum diode, composed of an anode and a cathode, a filament is installed in the cathode, and the anode is composed of an inclined anode target and an auxiliary heat sink. The fluorescent board is arranged directly opposite the anode target of the X-ray tube. The filament voltage supply circuit is connected between a power supply and the filament in the cathode of the X-ray tube to convert the voltage of the power supply into the voltage required by the filament and output it to the filament. The high-voltage supply circuit is connected between the power supply and the X-ray tube to boost the voltage of the power supply and output it to the X-ray tube, thereby providing an instantaneous high-voltage electric field for the X-ray tube. It rotates the anode through the high-voltage supply circuit, and finally displays the fluorescence formed by X-rays on the fluorescent board.

[0004] However, the above scheme requires X-rays to form fluorescence on the fluorescent plate to show the exposure results, so the X-ray tube needs to be actually operated to generate X-rays. There are still safety hazards during teaching, which prevents students from directly observing at close range, and the teaching and operation process is inconvenient. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a rotating anode X-ray tube simulation device to overcome the defects of the existing X-ray tube simulation device, such as the need for high voltage startup, complex overall structure, and ultimately the generation of X-rays, which poses a safety hazard and prevents users from directly observing at close range, resulting in insufficient teaching effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a rotating anode X-ray tube simulation device, which is used to simulate the rotation process of the anode of the X-ray tube, the heating process of the cathode filament and the exposure process of the X-ray, comprising: An X-ray tube having an anode module and a cathode module; A power conversion module, electrically connected to an AC power source, and converting the AC power source into a DC power source; an anode starting capacitor, arranged between the AC power supply and the anode module, for starting the rotation of the anode module; A cathode adjustment module, disposed between the power conversion module and the cathode module, for adjusting the light of the cathode module; An exposure simulation module, electrically connected to the cathode adjustment module, for replacing the exposure process of the X-ray tube; A multi-speed control module, electrically connected to the anode module and the exposure simulation module, and used to control the start and stop of the anode module and the exposure simulation module; The exposure simulation module starts running after receiving the trigger signal from the multi-speed control module.

[0007] Furthermore, the multi-speed control module includes a first-speed switch, a second-speed switch, a first relay and a second relay. The first-speed switch controls the start and stop of the first relay, and the second-speed switch controls the start and stop of the second relay.

[0008] Further, the anode module is electrically connected to the AC power supply through the first relay, and the exposure simulation module is electrically connected to the power conversion module through the second relay.

[0009] Furthermore, the multi-speed control module also includes an exposure hand brake, and the first-speed switch and the second-speed switch are integrated in the exposure hand brake.

[0010] Furthermore, the anode module includes a starting winding and a working winding, the starting winding is connected in series with the anode starting capacitor, and the working winding, the starting winding and the anode starting capacitor are connected in parallel to the first relay.

[0011] Furthermore, the cathode module includes a large-focus filament and a small-focus filament, and the cathode adjustment module is connected in series with the large-focus filament or the small-focus filament to switch the large-focus filament or the small-focus filament to operate.

[0012] Furthermore, the exposure simulation module includes a timer and a trigger device, and the trigger device starts running after receiving a trigger signal from the timer.

[0013] Furthermore, the trigger device is a buzzer, and the buzzer emits a buzzer after receiving the trigger signal of the timer.

[0014] Furthermore, it also includes an image display module, which is electrically connected to the exposure simulation module and the cathode adjustment module.

[0015] Furthermore, the image display module comprises an analog light ring, and the analog light ring is arranged on the anode module.

[0016] The beneficial effects of the present invention are as follows: the rotating anode X-ray tube simulation device provided by the present invention, after the anode starting capacitor is activated to rotate the anode module, replaces the exposure process of the X-ray tube parameter X-rays through the exposure simulation module, so that the anode module and the cathode module do not need to actually work to generate X-rays. While ensuring safety, the operation process of the actual rotating anode X-ray tube is simulated, so that the operator can directly observe the working principle of the rotating anode X-ray tube at close range, thereby effectively improving the teaching quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A circuit diagram of the operating part of an embodiment of the present invention; Figure 2 A circuit diagram of a multi-speed control module in one embodiment of the present invention; Figure 3 An overall circuit diagram of an embodiment of a rotating anode X-ray tube simulation device provided by the present invention; Figure 4 This is an operation logic diagram of an embodiment of a rotating anode X-ray tube simulation device provided by the present invention.

[0018] Description of labels: 1. Anode module; 11. Anode starting capacitor; 12. Working winding; 13. Starting winding; 2. Cathode module; 21. Large focus filament; 22. Small focus filament; 3. Power conversion module; 4. Cathode adjustment module; 41. Regulator; 42. Adjustment switch; 5. Exposure simulation module; 51. Timer; 52. Buzzer; 6. Multi-speed control module; 61. First gear switch; 62. Second gear switch; 63. First relay; 64. Second relay.

[0019] L, live wire; N, neutral wire; F1, fuse 1; F2, fuse 2. DETAILED DESCRIPTION

[0020] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0021] Existing X-ray tube simulation devices require high voltage to start, have a complex overall structure, and ultimately produce X-rays, which poses a safety hazard and prevents users from directly observing at close range, resulting in insufficient teaching effects.

[0022] Based on this, please refer to Figures 1 to 4A rotating anode X-ray tube simulation device is used to simulate the rotation process of the anode of the X-ray tube, the heating process of the cathode filament and the exposure process of the X-ray, including: an X-ray tube, a power conversion module 3, an anode starting capacitor 11, a cathode adjustment module 4, an exposure simulation module 5 and a multi-speed control module 6. The X-ray tube has an anode module 1 and a cathode module 2; the power conversion module 3 is electrically connected to the AC power supply to convert the AC power supply into a DC power supply; the anode starting capacitor 11 is arranged between the AC power supply and the anode module 1, and is used to start the rotation of the anode module 1; the cathode adjustment module 4 is arranged between the power conversion module 3 and the cathode module 2, and is used to adjust the light of the cathode module 2; the exposure simulation module 5 is electrically connected to the cathode adjustment module 4, and is used to replace the exposure process of the X-ray tube; the multi-speed control module 6 is electrically connected to the anode module 1 and the exposure simulation module 5, and is used to control the start and stop of the anode module 1 and the exposure simulation module 5; the exposure simulation module 5 starts to run after receiving the trigger signal of the multi-speed control module 6. Specifically, the voltage of the AC power supply is 220V.

[0023] There is no specific phenomenon when X-rays are actually generated. Not only are the conditions for excitation harsh and the requirements for components high, but also in the actual teaching simulation process, the operator cannot observe directly at close range due to safety factors. Therefore, the multi-speed control module 6 controls the exposure simulation module 5 to produce sound effects, lights or vibrations, etc., to replace the exposure process of the anode module 1 and the cathode module 2 generating X-rays under high voltage.

[0024] Specifically, since there is no need to produce X-rays in the end, the X-ray tube can be a rotating anode tube disassembled from scrapped X-ray imaging equipment. It only needs the anode to start rotating and the cathode filament to heat up. Alternatively, a unidirectional asynchronous motor can be set at the anode of the scrapped X-ray tube, and the anode target plate of the rotating anode tube can be rotated by the unidirectional asynchronous motor and the anode starting capacitor 11. Those skilled in the art can design a suitable circuit according to their needs. This arrangement can greatly reduce costs while ensuring the teaching effect compared to the conventional cathode filament that needs to be excited.

[0025] It can be understood that the rotating anode X-ray tube simulation device provided by the present invention, after the anode starting capacitor 11 is used to start the rotation of the anode module 1, replaces the exposure process of the X-ray tube parameter X-rays through the exposure simulation module 5, so that the anode module 1 and the cathode module 2 do not need to actually work to generate X-rays. While ensuring safety, the operation process of the actual rotating anode X-ray tube is simulated, so that the operator can directly observe the working principle of the rotating anode X-ray tube at close range, thereby effectively improving the teaching quality.

[0026] In some embodiments, Figure 2As shown, the multi-speed control module 6 includes a first-speed switch 61, a second-speed switch 62, a first relay 63 and a second relay 64. The first-speed switch 61 controls the start and stop of the first relay 63, and the second-speed switch 62 controls the start and stop of the second relay 64. That is, the first relay 63 and the second relay 64 are connected in parallel, and the state switching of different relays is controlled by the first-speed switch 61 and the second-speed switch 62, respectively, so that the multi-speed control module 6 can independently control the anode module 1 and the exposure simulation module 5. Those skilled in the art can design a suitable circuit connection method according to needs, without specific limitation.

[0027] In some embodiments, Figure 3 As shown, the anode module 1 is electrically connected to the AC power supply through the first relay 63, and the exposure simulation module 5 is electrically connected to the power conversion module 3 through the second relay 64. This arrangement makes the operation of the anode module 1 relatively independent from the operation of the exposure simulation module 5, and the anode module 1 and the exposure simulation module 5 can be adjusted separately as needed, so that different modules of the rotating anode X-ray tube simulation device have higher adjustability and independence, which is convenient for users to perform maintenance. Those skilled in the art can design a suitable circuit connection method according to needs, without specific limitation.

[0028] In some embodiments, the multi-speed control module 6 also includes an exposure hand brake, and the first-speed switch 61 and the second-speed switch 62 are integrated in the exposure hand brake. The exposure hand brake has the first-speed switch 61 and the second-speed switch 62 that take effect in sequence. Referring to the actual operation process of the actual X-ray machine, the first-speed switch 61 is used to simulate the pre-exposure state, so that the anode module 1 is in a rotating state. Then, the second-speed switch 62 is used to trigger the exposure simulation module 5 to simulate the exposure state, effectively simulating the actual operation process, deepening the user's impression, and improving the teaching effect.

[0029] In some embodiments, the anode module 1 includes a starting winding 13 and a working winding 12, the starting winding 13 is connected in series with the anode starting capacitor 11, and the working winding 12 is connected in parallel with the moving winding and the anode starting capacitor 11 on the first relay 63. The two ends of the working winding 12 are respectively electrically connected to the two sets of middle ends of the first relay 63, and the normally open ends corresponding to the two sets of middle ends of the first relay 63 are electrically connected to the live wire and the neutral wire of the AC power supply. Figure 3As shown, taking the first relay 63 as a 14-pin relay as an example, the terminals 11 and 12 of the first relay 63 are respectively connected to the two ends of the working winding 12, the terminal 7 is electrically connected to the live wire, and the terminal 8 is electrically connected to the neutral wire. The first-gear switch 61 is arranged in series in the connection line between the terminal 13 and the output positive pole of the power conversion module 3, and the terminal 14 is electrically connected to the output negative pole of the power conversion module 3. The anode rotation circuit is formed as a whole. After closing the first-gear switch 61, the terminals 7 and 8 are switched to the closed state, the start winding 13 and the working winding 12 are energized, and the anode target disk of the X-ray tube starts to rotate under the action of the anode start capacitor 11, and enters the pre-exposure state. Specifically, the actual circuit design of the anode rotation circuit can be adjusted by those skilled in the art according to the needs and the specific conditions of the components, and no specific limitation is made.

[0030] In some embodiments, the cathode module 2 includes a large focus filament 21 and a small focus filament 22, and the cathode adjustment module 4 is connected in series with the large focus filament 21 or the small focus filament 22 to switch the large focus filament 21 or the small focus filament 22 to work. Specifically, the cathode adjustment module 4 includes a regulator 41 and an adjustment switch 42. The large focus filament 21 and the small focus filament 22 are arranged in parallel, and the regulator 41 switches the connection with the large focus filament 21 or the small focus filament 22 through the adjustment switch 42. After the regulator 41 is set, the voltage and current of the large focus filament 21 and the small focus filament 22 can be controlled, thereby ensuring the normal operation of the cathode module 2. At the same time, the operator can select different filaments as needed, so as to adjust the gear of the cathode. Specifically, the positive and negative electrodes of the regulator 41 are electrically connected to the output positive and output negative electrodes of the power conversion module 3, the output positive electrode of the regulator 41 is connected in series with the adjustment switch 42, and the two switching ends of the adjustment switch 42 are electrically connected to the large focus filament 21 or the small focus filament 22 respectively. The output cathode of the regulator 41 is electrically connected to the large focus filament 21 and the small focus filament 22, forming a cathode filament heating circuit as a whole. Those skilled in the art can adjust the circuit design of the cathode filament heating circuit as needed, without specific limitation.

[0031] In some embodiments, the exposure simulation module 5 includes a timer 51 and a trigger device, and the trigger device starts to run after receiving the trigger signal of the timer 51. After the timer 51 of the exposure simulation module 5 is turned on under the control of the multi-speed control module 6, the trigger device is operated after the set time, showing a preset reminder form, thereby simulating the actual use of the X-ray machine, after pressing the second gear of the exposure hand switch, the anode module 1 and the cathode module 2 are subjected to high voltage, so as to achieve the process of forming X-rays after the X-ray exposure state. The buzzer, vibration or light of the trigger device replaces the actual X-rays, greatly simplifying the circuits of the anode module 1 and the cathode module 2, reducing component requirements and saving costs.

[0032] Preferably, Figure 3As shown, the trigger device is a buzzer 52, and the buzzer 52 emits a buzzer after receiving the trigger signal of the timer 51. With this arrangement, the overall structure is simple, so that the operator can intuitively experience the operation process of the rotating anode X-ray tube from the pre-exposure state to the exposure state and the time required for the morphological transformation, enhance the operation experience, and thus improve the teaching effect. Specifically, the positive electrode of the buzzer 52 is electrically connected to the OUT end (output end) of the timer 51, the Trig end (trigger end) of the timer 51 is electrically connected to the normally open terminal of the second relay 64, and the corresponding middle end of the second relay 64 is electrically connected to the output negative electrode of the power conversion module 3. The second relay 64 is controlled to switch the state through the second gear switch 62, so that the Trig end of the timer 51 receives the trigger signal, and the OUT end outputs an electrical signal after the set time, so that the buzzer 52 is started and a buzzer is generated. Specifically, taking the timer 51 as a 555 timer 51 as an example, the timer 51 adopts a monostable timing circuit design, adopts the R-7.6-C wiring method, is triggered by the Trig end input, and outputs from the OUT end. Those skilled in the art can design appropriate circuits according to the components actually used, without any specific limitation.

[0033] In some embodiments, an image display module is also included, and the image display module is electrically connected to the exposure simulation module 5 and the cathode adjustment module 4. After the trigger device is started, the image display module displays a set pattern. Specifically, the image display module includes an LED screen, which is arranged on the side of the X-ray tube. After the trigger device is operated, the image display module displays different preset pictures according to the different states of the cathode adjustment module 4, thereby simulating and displaying the different effects of the X-rays finally generated by the large focus filament 21 and the small focus filament 22. Those skilled in the art can design a suitable circuit connection method according to needs, without specific limitation.

[0034] Preferably, the image display module includes a simulated light ring, which is arranged on the anode module 1. Specifically, the simulated light ring is arranged on the anode target disk of the anode module 1, and the simulated light ring is electrically connected to the second relay 64. After the second relay 64 switches the form, the simulated light ring is started to display the annular area generated by the electron beam generated by the cathode filament when the anode target disk is bombarded by the electron beam generated by the cathode filament under high-speed rotation when entering the exposure state, giving the operator a deeper impression, thereby improving the teaching effect. Those skilled in the art can design a suitable circuit connection method according to needs, without specific limitation.

[0035] Please refer to Figures 1 to 4The first embodiment of the present invention is: a rotating anode X-ray tube simulation device, used to simulate the rotation process of the anode of the X-ray tube, the heating process of the cathode filament and the exposure process of the X-ray, including: an X-ray tube, a power conversion module 3, an anode starting capacitor 11, a cathode adjustment module 4, an exposure simulation module 5 and a multi-speed control module 6. The X-ray tube has an anode module 1 and a cathode module 2; the power conversion module 3 is electrically connected to the AC power supply to convert the AC power supply into a DC power supply; the anode starting capacitor 11 is arranged between the AC power supply and the anode module 1, and is used to start the rotation of the anode module 1; the cathode adjustment module 4 is arranged between the power conversion module 3 and the cathode module 2, and is used to adjust the light of the cathode module 2; the exposure simulation module 5 is electrically connected to the cathode adjustment module 4, and is used to replace the exposure process of the X-ray tube; the multi-speed control module 6 is electrically connected to the anode module 1 and the exposure simulation module 5, and is used to control the start and stop of the anode module 1 and the exposure simulation module 5; the exposure simulation module 5 starts to run after receiving the trigger signal of the multi-speed control module 6.

[0036] The multi-speed control module 6 includes a first-speed switch 61, a second-speed switch 62, a first relay 63 and a second relay 64. The first-speed switch 61 controls the start and stop of the first relay 63, and the second-speed switch 62 controls the start and stop of the second relay 64. The anode module 1 is electrically connected to the AC power supply through the first relay 63, and the exposure simulation module 5 is electrically connected to the power conversion module 3 through the second relay 64. The multi-speed control module 6 also includes an exposure hand brake, in which the first-speed switch 61 and the second-speed switch 62 are integrated. The pole module includes a starting winding 13 and a working winding 12, the starting winding 13 is connected in series with the anode starting capacitor 11, and the working winding 12 is connected in parallel with the starting winding 13 and the anode starting capacitor 11 on the first relay 63. The two ends of the working winding 12 are electrically connected to the two sets of middle ends of the first relay 63 respectively, and the normally open ends corresponding to the two sets of middle ends of the first relay 63 are electrically connected to the live wire and the neutral wire of the AC power supply.

[0037] The cathode module 2 includes a large-focus filament 21 and a small-focus filament 22 . The cathode adjustment module 4 is connected in series with the large-focus filament 21 or the small-focus filament 22 to switch the large-focus filament 21 or the small-focus filament 22 to work.

[0038] In this embodiment, the first relay 63 and the second relay 64 use 14-pin relays, and the terminals 11 and 12 of the first relay 63 are respectively connected to the two ends of the working winding 12, the terminal 7 is electrically connected to the live wire, and the terminal 8 is electrically connected to the neutral wire. The first gear switch 61 is arranged in series in the connection line between the terminal 13 and the output positive electrode of the power conversion module 3, and the terminal 14 is electrically connected to the output negative electrode of the power conversion module 3. The anode rotation circuit is formed as a whole. After the first gear switch 61 is closed, the terminals 7 and 8 are switched to the closed state, the starting winding 13 and the working winding 12 are energized, and the anode target disk of the X-ray tube starts to rotate under the action of the anode starting capacitor 11, and enters the pre-exposure state.

[0039] In this embodiment, the exposure simulation module 5 includes a timer 51 and a buzzer 52. The buzzer 52 emits a buzzer after receiving a trigger signal from the timer 51. The positive electrode of the buzzer 52 is electrically connected to the OUT terminal (output terminal) of the timer 51, the Trig terminal (trigger terminal) of the timer 51 is electrically connected to the No. 5 terminal of the second relay 64, and the No. 9 terminal of the second relay 64 is electrically connected to the output negative electrode of the power conversion module 3. The second relay 64 is switched by the second-gear switch 62, so that the Trig terminal of the timer 51 receives a trigger signal, and an electrical signal is output from the OUT terminal after a set time, so that the buzzer 52 is started and a buzzer is generated. The timer 51 is a 555 timer 51, which adopts a monostable timing circuit design and adopts an R-7.6-C wiring method. The trigger is input from the Trig terminal and output from the OUT terminal.

[0040] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A rotating anode X-ray tube simulation device, used to simulate the rotation process of the anode of the X-ray tube, the heating process of the cathode filament and the exposure process of X-rays, characterized in that: include: An X-ray tube having an anode module (1) and a cathode module (2); A power conversion module (3) is electrically connected to an AC power source and converts the AC power source into a DC power source; an anode starting capacitor (11), arranged between the AC power supply and the anode module (1), and used to start the rotation of the anode module (1); A cathode adjustment module (4), arranged between the power conversion module (3) and the cathode module (2), and used for adjusting the light of the cathode module (2); An exposure simulation module (5) electrically connected to the cathode adjustment module (4) and used to replace the exposure process of the X-ray tube; A multi-speed control module (6) electrically connected to the anode module (1) and the exposure simulation module (5), and used to control the start and stop of the anode module (1) and the exposure simulation module (5); The exposure simulation module (5) starts to operate after receiving a trigger signal from the multi-speed control module (6).

2. The rotating anode X-ray tube simulation device according to claim 1, characterized in that: The multi-speed control module (6) comprises a first-speed switch (61), a second-speed switch (62), a first relay (63) and a second relay (64); the first-speed switch (61) controls the start and stop of the first relay (63), and the second-speed switch (62) controls the start and stop of the second relay (64).

3. The rotating anode X-ray tube simulation device according to claim 2, characterized in that: The anode module (1) is electrically connected to the AC power source via the first relay (63), and the exposure simulation module (5) is electrically connected to the power conversion module (3) via the second relay (64).

4. The rotating anode X-ray tube simulation device according to claim 2, characterized in that: The multi-speed control module (6) further comprises an exposure hand brake, wherein the first-speed switch (61) and the second-speed switch (62) are integrated into the exposure hand brake.

5. The rotating anode X-ray tube simulation device according to claim 3, characterized in that: The anode module (1) comprises a starting winding (13) and a working winding (12); the starting winding (13) is connected in series with the anode starting capacitor (11); and the working winding (12) is connected in parallel with the starting winding (13) and the anode starting capacitor (11) to the first relay (63).

6. The rotating anode X-ray tube simulation device according to claim 3, characterized in that: The cathode module (2) comprises a large-focus filament (21) and a small-focus filament (22), and the cathode adjustment module (4) is connected in series with the large-focus filament (21) or the small-focus filament (22) to switch the large-focus filament (21) or the small-focus filament (22) to operate.

7. The rotating anode X-ray tube simulation device according to claim 3, characterized in that: The exposure simulation module (5) comprises a timer (51) and a trigger device, and the trigger device starts running after receiving a trigger signal from the timer (51).

8. The rotating anode X-ray tube simulation device according to claim 7, characterized in that: The trigger device is a buzzer (52), and the buzzer (52) emits a buzzer sound after receiving a trigger signal from the timer (51).

9. The rotating anode X-ray tube simulation device according to claim 1, characterized in that: It also comprises an image display module, wherein the image display module is electrically connected to the exposure simulation module (5) and the cathode adjustment module (4).

10. The rotating anode X-ray tube simulation device according to claim 9, characterized in that: The image display module comprises an analog light ring, and the analog light ring is arranged on the anode module (1).

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