[The world's largest Telescope] The clarity of the world's largest Telescope in the world is ten times that of Hubble

In 1995, Chinese astronomers proposed the idea of building a 500 -meter -caliber spherical sphere in the Karst depression, and was located in Dawo in Pingtang County, Qiannan Prefecture, Guizhou Province.In 2007, the project was approved by national approval and became one of the nine major scientific and technological infrastructure in my country.fastEssence

Fast is called FIVE HUNDRED Meters Aperture Spherical Telescope (500 -meter -caliber spherical radio Telescope). It uses the unique terrain conditions of the unique design of Chinese scientists and the unique terrain conditions of the Karster depression in southern Guizhou, my country to build a high -sensitive giant radio electricity with a large high -sensitivity of about 30 football fields. Telescope.Compared with the 100 -meter Telescope of Germany, which is known as the "largest machine on the ground", FAST has increased by about 10 times the sensitivity; the United States ARECIBO 300m Telescope, which was ranked as the top ten projects in the 20th century project of the 20th century of the human 20th century,Compared with, its comprehensive performance has increased by about 10 times.As the world's largest single -caliber Telescope, Fast will maintain the status of world -class equipment in the next 20 to 30 years.

The FAST project has three major independent technological innovations: first, the first time in the world uses natural landform construction to build a giant Telescope; the other is to use active reflex surface technology.Innovation is a light cable dragging feed source support technology, reducing the 10,000 -ton platform to dozens of tons, achieving a millimeter -level dynamic positioning accuracy.The world's largest Telescope was officially put into use at the end of September 2016 and was open to the world. Astronomers in many countries have submitted a research and observation plan.

Profound meaning

As a multi -disciplinary basic research platform, FAST has the ability to extend neutral hydrogen observation to the edge of the universe, observe dark matter and dark energy, and find the first generation of celestial bodies.It can find about 7,000 pulse stars in one year, and study the material structure and physical laws in extreme state; there is hope to discover strange stars and quark stars; discover the neutron star -black hole double star, no need to rely on the model to accurately determine the quality of black holes; accurately through preciseThe reaching time of the determined pulse star to detect gravitational waves; as the largest station, add the international long baseline network to form a imaging image for the super fineness of the celestial body; it may also find that the high -red movement of the galaxy is also found.Observation breakthroughs; used to search for identifying possible interstellar communication signals, looking for external civilization.

Fast has important application value in major national needs.The Chinese space measurement and control capacity is extended from the Earth synchronization track to the outer edge of the Solar system, and the downward rate of deep space communication data is 100 times.The measurement accuracy of pulse stars has increased from the current 120 -nan seconds to 30 nan second seconds, becoming the most accurate pulse chronograph internationally, making pulse star clocks for independent navigation.Perform high -resolution microwave inspections, diagnose and identify weak space signals with a resolution of 1Hz, and serve national security as a passive strategic radar.As a non -related scattering radar receiving system for the "Wuwu Project", it provides high -resolution and high -efficiency ground observations; tracking and detecting the throwing of the coronation material to serve the space weather forecast.

Fast research involves many high -tech fields, such as antenna manufacturing, high -precision positioning and measurement, high -quality radio receiver, sensor network and intelligent information processing, ultra -broadband information transmission, massive data storage and processing.FAST key technical achievements can be applied to many related fields, such as large -scale structural engineering, high -precision dynamic measurement, large industrial robot development, and multi -wave radar device.FAST's construction experience will have an impact on the development of my country's manufacturing technology towards informationization, limit, and green.

With Fast, the remote and occluded Qiannan Karst Mountains will become the world's attention to the international astronomical academic center, becoming a new window that shows Guizhou to the world.The astronomical science popularization base with Fast as the main body will promote popular science work in western my country and even the whole country, educate young people, publicize the public and decision -making Levels, and serve the long -term strategic goals of science and education.

1. How to use folding tables and chairs

folding tables and chairs are often used outdoors. Generally, the folding tables and chairs need to be opened when used.

1. How to open the storage of Outdoor folding tables

(1) Open

The folding table adopts a central telescopic design. When it needs to be opened, the table is pulled open by the table, and the hidden panel below can be expanded, and the length of the desktop will increase.The side of the embedded panel of the lift is connected by the hardware anti -collision button. The stitching is good, and a person can easily stretch and shrink.

(2) storage

Pull out the table legs out of the card slot, then fold inward, and press the round Tube at the end of the table leg when you close it.

2. How to open the storage of Outdoor folding chairs

(1) Open

The structure of Outdoor folding chair is relatively single. Generally, it is composed of seat surface and back. Most of them have special armrest design. Press the handrail and push back directly.The chair does not have the design of the handrail. Its folding part is the back of the back of the seat.There are also some folding chairs. The design of the folding chair may be a three -stage type. In this way, it is necessary to start with the two sides of the lounge chair, then pull out the middle part, and adjust the length and width of the lounge chair according to the height of the human body.

(2) storage

Find the "Unlock" button on the back of the folding chair to keep the back in a state of tightness; press the back of the folding chair slightly forward, while the seats on both sides of the seats are stacked separately; then the cushions are flipped, and you can use the cushion to put the cushion, you can use the cushion, you can use the cushion to put it.The back is completely flat, so that it can be folded and folded away.

2. What to do if the Outdoor folding tables and chairs are unstable

When using Outdoor folding tables and chairs, sometimes the folding tables and chairs will be a bit unstable. Many friends are worried that putting things up will cause folding tables and chairs to break. So how to deal with Outdoor folding tables and chairs?

1. Outdoor folding tables and chairs are unstable. The reason may not be opened in place, resulting in poor firmness. Generally, folding tables and chairs are put away, and then it is opened again. Pay attention to opening it in place.

2. In addition to the correct use, the unstable of the folding tables and chairs may also be caused by too many things and bearing the bearing capacity of the table and chair. You can remove the things on the table and chairs.

3. In addition, there may be damage at the connection of the outdoor folding table and chair. You can prepare tools such as nails, hammers, corner iron and other tools, and shake the folding tables and chairs gently.Tap at the place where each connection is connected so that we can find the damaged position, and then tighten the screw.

3. precautions for the use of folding tables and chairs

1. When the folding tables and chairs are opened and folded, they must be used in accordance with the correct way. Do not force it to open or put it away to avoid damage.

2. The capacity of the folding table and chair for Outdoor is limited. Be careful not to put too many things on it.

3. After the folding tables and chairs are used, they should also pay attention to maintenance, and timely wipe the water on the surface of the steel pipe with dry cloth. If possible, you can spray car wax or sewing machine oil for maintenance.

1. What does the gliding umbrella club do?

The club is an organizational group or place where people gather together for entertainment activities. The gliding umbrella club is an organizational group composed of gliding umbrella lovers., Global umbrella Equipment Rent and sales, Global umbrella Information and other services.

2. Is it necessary for learning gliding umbrellas to go to the gliding umbrella club?

Need.

The gliding umbrella seems simple. After a few days of ground practice, theoretical learning, simulation flight, two -person umbrella teaching, you can fly up to command flight, but in fact, the equipment structure, flight principle, weather understanding, umbrella, umbrella control and other Links can beAll need to be learned. Self -learning gliding umbrellas may have hidden safety hazards, and the learning efficiency is low.

If you have a plan to learn the gliding umbrella, it is recommended to learn about the local gliding umbrella club and participate in regular gliding umbrella training. This is also responsible for your safety.

3. How to choose a reliable gliding umbrella club

With the development of gliding umbrellas, there are more and more gliding umbrella clubs, but not all gliding umbrella clubs are reliable. If you want to choose a good gliding umbrella club, you can see the following aspects:

1. Coach and teacher of the gliding umbrella club

It is really important to choose a good entry coach, which may determine your entire gliding umbrella career.Good gliding umbrella coaches can give you the cultivation of security awareness, solid basic skills, and development of good habits, etc., will be greatly helpful for future flight safety and growth.

To judge how the teacher's teacher's teacher's teacher, you can see if the head coach is a rich teaching experience of the certification coach and coaching team of the Chinese Aeronautical sports Association. In addition, the teaching process is also important.Theoretical learning -ground training -Xiaopo training -two -person umbrella flight teaching -simulator practice -independent flights for teaching.

2. Place conditions of the gliding umbrella club

A good gliding umbrella learning venue should have the following characteristics: there are stable and sustainable weather in the flying umbrella season, suitable for flying umbrellas. Continuous flight can ensure our learning efficiency;There are no too many obstacles, suitable for novice flights; there are small slopes for trainees to train the ground.

3. The location of the gliding umbrella club

Beginners try to choose a gliding umbrella club that is closer to their resident or convenient transportation. After all, learning Flying Global umbrella does not mean that short -term speed achievements can be fully learned.A qualified and independent pilot needs long -term learning accumulation experience.And if you want to continue advanced after studying the basic course of the A certificate, you still need to accumulate up and down.

1. How much is the probation light?

Detective lamps, also known as Outdoor probe lamps, are commonly used outdoor lamps. They are widely used in Outdoor landscape lighting and Outdoor safety prevention areas. Many donkeys will buy a probe lamp to help Outdoor photos. So what is the price of the probe lamp?

Generally speaking, the price of the probe Lights is mainly affected by factors such as lamp sources, power, accessories, brands, performance, irradiation distance, etc. Because of the quality gap, the price is also high and low, the ordinary ones are about 50-100 yuan, and it is more expensive.It takes 300-500 yuan. These are home-based scratch. If it is a large probe lamp on the truck, the price is much more expensive, usually thousands of yuan.

2. How to buy Outdoor visit Lights

When traveling in the wild, donkeys will use Outdoor probe Lights. When buying Outdoor visit Lights, the main factors that need to be considered are the following points:

1. Brightness

The higher the brightness is generally better, but the brightness is too high, which will also affect the life of the light source, and the heat is large and the battery life is poor. Therefore, the brightness of the ordinary Outdoor visits is generally not particularly large.Objects have better lighting function.

2. color temperature

The color temperature of about 4300K slightly yellow is more suitable for human eyes. The color temperature (that is, Blu -ray) of more than 5600 people will lose the layer and cannot see the details.

3. Light source

The size of the light source of the probe light is related to the hardness of the light. The larger the light source, the softer the light, the more likely to perceive the three -dimensional objects and detect the obstacles, but the corresponding irradiation distance is also shortened.When buying, you can choose according to your use. The long -range lighting source sources are smaller, and the sources of pedestrian Lights and camp Lights are larger.

4. Light distribution

Seeing whether the light and darkness is different in the lighting area, whether there are concentrated spots. Outdoor lighting generally requires a bright light spot in the center of the light area to illuminate the target, and there is a certain range of scattered scattered around to see the road or environment.

5. Protectiveness

Outdoor visit lamps are used outdoors after all, so they require certain protection performance. Usually IP Levels are expressed that general use can reach IP43 protection, mainly to prevent light rain and occasionally falling into the water; if it is under high intensity and bad weather, it is recommendedSelect the IP67 Protection Detective Light.

6. Endurance

The endurance capacity of Outdoor probe lamps is high or low. It is recommended to choose a viewing light for the high beam to reach more than six hours (including the backup power supply), which requires the replacement of the power supply.

1. Is comprehensive training shoes suitable for daily wear?

The design of comprehensive training shoes is designed specially for athletes, so as to better protect the feet.The soles are particularly thick, which can better cushion the pressure on the ground, avoid impact on the soles of the shoe and harm the joints of the feet.In addition, the upper of comprehensive training shoes is stronger and can better protect the feet.Many people are curious about comprehensive training shoes suitable for daily wear?

In daily life, there are some inconvenience to walk in comprehensive training shoes.The shoes are relatively heavy, easy to grind their feet, and it is easy to cause foot discomfort for a long time.In addition, wearing comprehensive training shoes requires certain skills.Because the soles of comprehensive shoes are relatively hard, you need to relax your knees and ankles when walking to avoid being impacted too much.

Therefore, the comprehensive training shoes are suitable for daily wear according to personal circumstances.If you often need to walk for a long distance or you need to walk on an uneven ground, it will be better to choose comprehensive training shoes.But if our journey is relatively short, it is better to choose a casual shoes with comfort.

2. Can comprehensive training shoes be competent for Badminton sports?

When Badminton beginners are not familiar with ball skills, comprehensive training shoes can be competent for Badminton.However, in professional competitions, comprehensive training shoes are not enough to meet the requirements of Badminton on the quality, non -slip, and support of shoes.Therefore, long -term Badminton is not suitable for comprehensive training shoes. It is recommended to choose professional badminton shoes.

3. What are the application scenarios of comprehensive training shoes

The versatility of comprehensive training shoes makes it suitable for a variety of exercise and exercise activities.They provide good buffer and support, and at the same time have sufficient flexibility and response, suitable for medium and long distance Running.In addition, comprehensive training shoes are also suitable for high -strength aerobic exercise such as skipping rope skipping, which can provide good support and stability.

Comprehensive training shoes are not only suitable for weight training, such as weightlifting and strength training, but also suitable for various aerobic fitness activities, such as aerobic dance, fitness exercises and comprehensive fitness training.Comprehensive training shoes provide sufficient support, buffer and flexibility, suitable for activities such as basketball and other activities that need to change, jump and move frequently.

The scope of application of comprehensive training shoes is widely used, so you need to consider personal sports needs when choosing.If you have specific sports needs, it is recommended to consult a recommendation guide for professionals or reference brands to ensure that you choose suitable sports shoes.Due to its multifunctional and versatility, comprehensive training shoe has become the first choice for many sports enthusiasts and fitness.