Product Name: Earthquake Alarm

Item Number: DX 132

Packaging: Packaging bags

Product dimensions: 10.5*7.5*13

Single weight: 0.1

Number of boxes packed: 500

Box specifications: 60*50*55

Earthquake alarm
The early seismograph - The world's early seismograph was invented by Zhang Heng. The seismograph is made of copper and shaped like a wine bottle. There are eight dragon heads around it, facing east, south, west, north, southeast, southwest, northeast and northwest. The dragon mouths are movable, each holding a small copper ball in its mouth. Under each dragon head, there is a copper toad with its mouth wide open. Inside the instrument, there is a copper "hanging pendulum", and beside the column, there are eight channels called "Eight Channels", along with ingenious mechanisms. The earthquake test conducted in the southwestern part of Gansu Province in 134 AD fully confirmed its accuracy in detecting earthquakes. It was over 1,700 years earlier than similar seismographs created in Europe. It's a pity that the seismograph of the Eastern Han Dynasty has long been lost. The seismographs we see are all restored by later generations based on historical records.
 
  
Experimental cognition
Battery box: As the name suggests, it is a box for installing and fixing batteries and serves as the power output device for batteries
LED lamp: LED (Light Emitting Diode), a light-emitting diode, is a solid-state semiconductor device that can directly convert electricity into light. The heart of an LED is a semiconductor chip. One end of the chip is attached to a bracket, one end is negative, and the other end is connected to the positive of the power supply, thus encapsulating the entire chip with epoxy resin. A semiconductor wafer is composed of three parts. One part is the P-type semiconductor, where holes are dominant. The other end is the N-type semiconductor, where electrons are mainly present. In the middle, there is usually a quantum well with 1 to 5 cycles. When current passes through the wire and acts on this chip, electrons and holes will be pushed towards the quantum well. Inside the quantum well, electrons and holes recombine and then emit energy in the form of photons. This is the principle of how leds emit light. The wavelength of light, that is, the color of light, is determined by the material that forms the P-N junction.
Resistance: The hindrance effect of a conductor on electric current is called resistance! The factors influencing the magnitude of resistance include length, cross-section, area, material, and temperature. Generally, for metallic materials, the resistance increases as the temperature rises.
Sound generator: The principle is very simple. It uses one port to output a square wave. When this square wave is input into the buzzer, it will produce sound. By controlling the frequency and time of the square wave, simple music can also be produced
 
Experimental procedures
1. Experimental Preparation: Get to know the experimental equipment: screw hole plate, resistor, wire, LED lamp, battery box, sound generator, screwdriver, diagonal pliers.

Experimental Report: When the small device is shaken, the glass beads will come into contact with the O-ring, the circuit will be connected, the LED will flash, and the buzzer will emit a beeping sound.

Technology models mainly refer to land, sea and air models. Science and technology model activities integrate competition, hands-on work and brainwork, and are deeply loved by a large number of teenagers. Their main function is also to cultivate teenagers' comprehensive hands-on skills and high quality. Therefore, at the turn of the century. Under the new form of deepening reform and vigorously promoting quality-oriented education, actively carrying out science and technology model activities is an effective measure to implement quality-oriented education.
Broaden your horizons and enrich your knowledge
Science and technology model activities are rich in knowledge. Take nautical models for example: During the making and navigation of nautical models, students can learn why ships float, how ships maintain stability, why propellers generate power, how ships run fast, why the Titanic didn't sink immediately after being damaged and why it couldn't avoid icebergs... If one delves deeper, students will come into contact with radio-controlled transmitting and receiving machines. Understand (or master) force, density, gravity, pressure, magnetic field, the structure of ships, the structure and principle of engines, radio, the selection of materials... A lot of knowledge. Among them, there is a lot of knowledge that is not in the "textbooks" but is often needed in life. This further inspires students to think about what other technologies are inspired by animals. Can they boldly imagine and make a technological model? Some think of dragonflies and planes, and fish-shaped ones associate torpedoes, etc. Can they also make some simple aircraft models? In this way, students will come into contact with and apply all kinds of knowledge in the science and technology model activities, supplement a lot of book knowledge, broaden their horizons, enrich their extracurricular life, and at the same time learn more knowledge.
Second, cultivate logical thinking ability
The science and technology model activity requires all participants to have dialectical, holistic and strict thinking methods." A sparrow may be small, but it has all the vital organs." The small technological models are large, real cars, ships and planes made in a certain scale. It is an integrated whole, and any slight change can affect the whole.
A model aircraft that remains idle during a competition must go through two stages: high-speed climbing and low-speed gliding. The adjustments during the climbing stage mainly involve the adjustment of the ground tension line and the Angle of attack after the two wings are twisted. Although the position, the installation angles of the wings and the flat tail, and the rudder also have a certain impact on the aircraft's climbing attitude, the changes in these parts directly affect the performance of the model during the gliding stage. Therefore, in the design and adjustment, different force conditions and solutions for these two stages should be considered. For instance, in the design and production of car, ship and aircraft models, great care is taken in the selection of material strength, rigidity and weight, and the best solution is chosen from the two. Therefore, in terms of thinking methods, science and technology model activities require teenagers to be dialectical, holistic and independent. Otherwise, a small mistake can cause the performance of the science and technology model they make to deteriorate or even become unusable.
It can be seen that a person's initial thinking begins with actions. The thinking characteristics of students are mainly in the form of concrete image thinking. Thinking cannot be separated from images and actions. In operational activities, students not only need to look with their eyes and do with their hands, but also think with their brains and speak with their mouths. This organically combines the external operational process with the dialectical, holistic and characteristic aspects in the internal intellectual activities, which effectively promotes the development of their thinking.
Third, cultivate good habits
Science and technology model activities are conducive to shaping students' good personalities, cultivating their strong willpower and pioneering spirit, as well as their meticulousness and patience, and fostering a rigorous attitude towards work, etc.
1. Arrange the time. Students need a certain amount of time and energy to deal with their schoolwork and the cultivation of various interests and specialties. Only by arranging their time reasonably can they be well-organized and busy but not chaotic.
2. See things through from beginning to end. Nowadays, most students are only children. They are afraid of hardship and lack perseverance in doing things, often giving up halfway. If we choose activities that allow them to do things by themselves and think of ways to complete a science and technology model work, their interest will increase even more. Because they all love to play with dynamic toys, from this perspective, it will also help them gradually overcome the inertia in the making process and persevere To complete one's own masterpiece. This thus cultivated in them the habit of seeing things through from beginning to end.
3. Collectivist spirit. The students designed, made and competed together, helping, comparing and learning from each other in the process. This way, the students' sense of collectivism is cultivated. Enable students to have others in their hearts and learn how to get along with others. Only in this way can we create a great cause together with others under the socialist market economy conditions. The days when people like the Curies would shut their doors and boil asphalt are gone forever. Today's society needs the cooperation of a talent group like the Apollo moon landing program to transform the world and create the future.
Fourth, stimulate students' interest in exploring the field of science and technology
A home or an inventor undoubtedly develops a strong interest in the things they love, then explores and studies them, and eventually achieves fruitful results in that field. Nowadays, we make and assemble technological models for students, allowing them to understand the formation of power, the generation of buoyancy, the influence of magnetic fields, etc. This lays a solid foundation for their future research and exploration in this field and sows the seeds of success.
In conclusion, actively carrying out science and technology model activities is an effective measure to implement quality-oriented education and cultivate students' moral, intellectual, physical, aesthetic and labor development, as well as their comprehensive qualities, to become cross-century workers and successors. Actively carrying out science and technology model activities is an effective measure to implement the spirit of the "Several Opinions of The State Council of the Communist Party of China on Strengthening Popularization Work" and the fitness plan, as well as to implement the "rejuvenating the Country through science and education" strategy proposed at the 15th National Congress of the Communist Party of China.