1. The role of football leg protection board

The leg protection plate is to protect the tibia of the calf, which is also known as the tibial plate.Due to the high confrontation of football games, the probability of players to be kicked to the calf is very high, so it is necessary to wear the tibia that suits your legs to protect your tibia in the game.From a physics point of view, the leg protection board is decentralized and buffer originally applied to the impact force on the calf.The gap between the leg protection board and the legs can play a buffer, and the flesh between the leg Bone and the legs also has a buffer effect to prevent fractures.

If the player does not wear the leg protection board, it is likely that tibial or fibula fractures are likely to occur when they have a strong force on the calf. In severe cases, they may even cause a thigh Bone fracture or knee cross ligament to tear.

It is clearly pointed out in the FIFA regulations: football players must wear sufficient protection to provide a certain protection. The leg protection board made of similar materials such as plastic and rubber, and the leg guard board must be completely covered by football socks.

2. How to choose a leg protection board

Generally speaking, the leg guard board is divided into two types based on the type of wearing: one is a traditional plug -in type, and the other is a sheet with socks.For example: Nike's Mercurial Blade Hinge, Adidas's F50 Adizero, and Puma's Evopower.Traditional plug-in boards such as SELECT, G-Form, Youzbao GMBH, etc.

From the shape of the leg protection board, we can simply divide it: big board and small board.The small board is relatively lightweight and relatively comfortable. Generally, the frontcourt players who like to break through the plate will choose small boards. Of course, the protection effect it can play is relatively poor.And many large leg protection plates with ankle -wrapped ankles at the same time. The same large plates are also worse in terms of flexibility and comfort. Generally, most of them are in the middle and backcourt defensive players tend to choose this type of leg protection board.

Be sure to choose a qualified product when choosing the leg protection board, a product that makes you feel comfortable.

Comfort can be considered through size, weight, thickness, fit, sweating not stuffy, and whether it will be challenging.For appearance, it is set in socks anyway, you can do not consider it.

3. How to bring football leg protection board

1. First of all, we need to put on football socks, but do not pull the ball socks to the knees.

2. Then, look for the calf parts protected by the leg protection board (usually a little bit lower in the middle of the calf), and insert the leg guard plate into the shoe socks.

3. Press the leg guard board, pull football socks to the knee, and complete the wear of the legs.

Note:

1. football leg protection boards include large plates, small boards, standard boards, etc., you can buy it according to your preference.

2. L is left, R is the right, and the leg guard board is generally marked. Remember not to wear it.

Having a sailing boat means to have a city -state that lives independently and freely at sea; with a sailboat, you can enter a port of any port on the sea ...Some people who get up are not an excessive price.However, so far, the sailboat is still a game that is only played by a small number of people in Mainland China.

1. Sailing equipment

As the so -called work is good, we must first benefit its instrument.When it was really going to sea, there was no professional sailing equipment.Due to its special environment, the sailing movement needs to be armed throughout the body.Sailing clothes, ropes, sunscreens,Sunglasses... Every detail may affect your progress of learning to control sailing.Therefore, don't forget to check the equipment before boarding the Ship.

Voyage

The weather on the sea is easier to change than the shore, so it is very important to wear and equipment correctly in this sport.You don't have to spend a lot of money on the equipment. Here is some simple guidance for your basic equipment:

Wear loose clothes.It takes a lot of movements to operate the sailing boat, so wearing can give you enough clothes for you

Carry extra clothes in luggage Bags.In order to add clothes or wet water when cold, you can change your clothes.

Wear light and breathable clothes in hot days.It is best to wear light -colored clothes. The clothes you lead can protect your neck from exposed to sunlight. The clothes with long sleeves can protect your arms from exposed to sunlight.

Use sunscreen (SFP15 or higher) to protect your Skin, and even so on a cloudy day, it is best to apply it frequently.

Wear a hat to protect your eyes and make your head from being shined with sunlight.In cold days, wearing a hat can warm the head.

Wear Sunglasses (at least 90%).Polarized mirrors can greatly reduce the dazzling feeling of water.

You must wear anti -slip shoes.In order to stand on the slippery deck.tennis shoes that are not broken sole will be a good choice. Of course, sailing shoes are the best choices, because the soles of the sole

The rubbing force is very large and dry very fast.Don't wear sandals or other toe shoes, sooner or later you will hurt your toes.

waterproof navigation boots will keep your feet warm and dry in cold days.

Daihang sea gloves can prevent your hands from being scratched and increase friction.It is best to wear waterproof gloves in cold days.

Lifeline is a must -have equipment for navigation.The life jacket should be fitted and has quality assurance.

Wear a few more layers in cold days.When you feel cold, your operation skills will be greatly affected, so wearing a few more clothes is a wise choice.Avoid wearing cotton clothing, wear

Clothes that can still keep warm after wet, such as cortex or polyester fiber clothing.Dedicated cold prevention clothing, dedicated cold -proof clothing can keep you warm and dry in bad weather.There are several styles to choose from:

Standard two -piece set, including a waterproof jacket with a hat pocket and an independent suspender pants.

Conjusational clothes will make you more dry, but you cannot take off your shirt or pants alone to adapt to changes in temperature.

On some particularly humid ships, crew members often wear wet warm clothes similar to divers.

Dry -style warm clothing is a suit that allows you to isolate water. They seal your neck, wrist and ankle tightly.They can prevent water and keep warm.

Safety equipment

In addition, there should be complete safety equipment on the sailing.Safety equipment not only protects Ship equipment, but also protects individuals. The crew must know the location and correct use of these equipment in order to prevent accidents during the movement.Sailing needs to prepare the following safety equipment on sailing on the shore:

Safe vests -Each person must have a qualified life -saving vest, and children must prepare special size life vests for them.

Life Rings -placed on the Ship that is easy to get on the boat, and once someone falls into the water, it can quickly throw it into the water fall.

FIRST AID Kit -Applicable first -aid drugs and items.

Bilge pump -manual or electric pump, which can quickly discharge the chamber water.

Bucket (bucket) -The rope of about two meters can be used urgently when the cabin is in water.

In addition to the above, if you want to travel long, you can also prepare excess anchor cables, waterproof flashlights, fire extinguishers, Gangpu, Haitu, signal bullets, wide -leaf short paddle, drainage equipment, horn, compass, sufficient water, knife, pliers, pliers, Screws, rolls and other tools to prepare from time to time.

First boarding

For the first time to board the Ship, pay attention to boarding etiquette. First of all, the captain's consent can only be boarded, just like invited to enter the house of others.When boarding the Ship, you should be very careful, especially when you are low tide, use a ladder or connect to the large boat by a small boat or a small boat. When crossing the side cable, you should cross the back to maintain the center of gravity of the body.Proper locations and prevent the hull of the hull may move into the water.

The sailing club often keeps tilting or suddenly unpredictable, especially for beginners who are not accustomed to activities on the tilted Ship.The string cable, the top pole of the cabin, or any fixed devices on the Ship can help you stand firm.When walking around, the body is slightly bent and walks, keeping the center of gravity, and be careful not to hit the horizontal pole or let it hit you.Walk on the deck to keep on the upper side for safety.

2. Small boat site and instructions

1. Former sail (jib): sail used in front of the main mast.

2. HeadStay or Forestay: The top of the mast can be pulled forward to the front boat, and the steel cable on the front sail can be buckled.

3. SHEET: The main control of the rope can be released or tightened and fixed. This picture refers to the front sail.

4. Mainsail: The largest sail that is raised after the main mast is also the source of the main power of the entire sailing boat.

5. Battens: The flat bars inserted from the back edge of the sail, in order to maintain a good sail shape.

6. MainSheet: Rope to control the angle of the main sail.

7. Boom: elongated, used to fix the bottom of the main sail.

8. BOOMVANG: The cable tightened or supported by the sail truss to prevent the sailing truffle up.

9. Mast (MAST): The long rods made of wood or aluminum are supported by steel cables for lifting and stretching sails.

10. SHRouds: The tension used to fix the side of the mast.

11. Centerboard: Under the hull, you can adjust the depth of water (mainly axis -based heart, front and rear lift).

12. Rudder: The device used to control the Ship in the direction.

13. Boat (BOW): The front of the hull.

14. Stern: The last part of the hull.

15. Hull: The shell of the Ship.

3. Preparation before playing sailing

1. Operation basis

(1) Look at the basic knowledge of sailing, understand what the sailboat is driving, and see the relationship between the wind, sail and boat in all directions, see the basic chapter of the sailboat in the forum technology post.

(2) Keep in mind the basic guidance and safety reminder of the teacher before launching. Sailing is a sports Tool with safety knowledge, including wearing a life jacket to understand the use of safety equipment. Pay attention to the difference between the boat and the big boat from the preparation of the Ship on the dock.To control the balance of the boat and your own center of gravity, it is generally necessary to quickly move the Ship to move the center of gravity to the center of the Ship to avoid the boat cover.Check whether each rope is in normal state.

(3) After boarding the Ship, pay attention to lift the sails because of the cooperation, and the boat can generally rise on the shore.

(4) After sailing, safely leave the dock.To judge the direction of the wind first, you can generally judge through the wind direction indicator on the boat or the wind line tied to the side branches. Generally, the range of 45 degrees in the direction of the wind is the range of 45 degrees.Sailing, of course, to adjust the angle of sails from the perspective of wind.

(5) After a period of familiarity, we can master the basic operation of the former sails, and start learning how to take the helm. The boat we learn is the rudder of the pushing rod. It is more sensitive than the rudder wheel.Basic driving in turn to understand the relationship between wind, front sail, main sail, main sail, Ship's order and rudder's sense of rudder, and can basically understand the basic essentials and feelings.

2. Important angle

(1) Wind direction angle: The term for sailing motion sailing, refers to the angle between the wind between the end of the same sailing boat.The motivation of the sailing Ship mainly depends on wind power.And the size of the wind direction to the promotion of sailing is very important.Athletes must correctly grasp the wind direction and angle in order to fully use the wind to drive sailing.

(2) Different wind direction angle divide the degree

The wind direction angle of the top wind is between 0 degrees and 30 degrees; the wind direction angle of the front wind is between 30 degrees and 60 degrees;At 80 degrees 1 100

Between degree; The wind direction angle of the Smooth wind is between 100 degrees and 170 degrees; The wind direction angle of the tail wind is between 170 degrees and 180 degrees.

3. Sailing knot

Since ancient times, skilled use of knots is one of the very important sailing skills, because it will save the life of the crew.Different use cables use different materials.Due to the high tensile strength, nylon rope can be used as anchor rope or a boat rope.Dakun has little resistance and can be used as a flag rope or main sail.Polypropylene can float and can generally be used as a tie rope.

(1) Single knot.The wide range of uses can prevent loosening.

(2) Lilac knot.It is not a very strong way of knotting, which can be used as a short -term link.

(3) 8 -character knot.Used for the top of the flag rope or main sail.

(4) Rolling knot.Used to connect with coarse cables.

(5) Horn knot.Used to connect the cable angle of the same system.

(6) Two halves.Used for the same column, ring, etc.

It is also important to exercise the skills to handle cables.First of all, take the cable carefully.Before handing, the disk is divided into two parts.When throwing the smaller part of the cable, you need to keep the hand shape so that the other half of the cable is naturally pulled out in the other hand.

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Use badminton shoes reasonably

1. When selecting sneakers, please choose according to your sports requirements and favorite styles. Because different types of sneakers have different design requirements and use requirements, it is necessary to choose sneakers suitable for your sports and need.

2. When choosing the number of the shoes, it is best to try it in person: when testing the shoes, you should use your feet to the ground, adopt an upright posture, and use your thumb up and down.Use the squat posture to confirm whether the shoe is grinded with the neck.

3. shoes are the fat marks of shoes.This needs to be based on the characteristics of sneakers and feet fat.In addition, adjusting the tightness of the shoelaces can also meet your requirements, and usually do not press the back.

4. When the shoes are dirty, you can use water dipped in a clean water to gently wash, then rinse it with water, and place it in a ventilated and cool place to avoid direct sunlight.Do not use warm air or fire to dry, so as not to cause aging, open glue, fade and severe deformation.Do not soak for a long time when washing, and generally soak time must not exceed 2 hours.

5. Most of the raw materials of sneakers are artificial synthetic polymer materials (mostly polyol nylon mesh and non -woven artificial leather, and most of the soles are made of rubber or rubber foam materials).In contact with organic reagents and oil solutions, it is not advisable to wear it for a long time in high temperature environments.Generally, the temperature of wearing or washing should not be higher than 45 degrees Celsius.

6. If it is stored for a long time, wash the shoes first, and store it in a cool ventilation at the cooling ventilation to avoid mildew.leather shoes are best dragged up with paper groups or shoes in the shoes to avoid severe deformation.

7. In order to make you reach a satisfactory dress, please treat you fairly. Remember not to wear general jogging shoes or do walking shoes for football.To give full play to your technical expertise.

badminton shoes maintenance

1. Do not contact organic reagents and oil solutions, compounds, and leather noodles.

2. It should not be worn for a long time in a high temperature environment.

3. Try to ensure that wearing in the environment of 45 degrees Celsius to minus 20 degrees Celsius.

4. If you do nt wear it for a long time, you should clean the shoes first and store it in a cool place to avoid pushing moldy.It is best to use filling in the shoe to avoid deformation.

5. Do not wear general jogging shoes or walking shoes for football.No kind of sneakers can be contacted with sharp weapons.

badminton shoes washing

1. When the shoes are dirty, you can use water dipped in clean water and wash it gently, and then rinse with water.

2. Do not use strong brush or wash the hot process and the corner of the printing pattern.

3. It is best to dry it with a washing machine after washing.

4. If you store it for a long time, you should wash the shoes first. After drying, place it and store it in a cool vent of ventilation so that the shoes have sufficient time to blow dry to avoid mold.

5. Do not use heating or light fire to dry, which can easily cause shoe aging and open gum, deformation and deformation.

6. Do not soak for a long time when brushing, and the soaking time must not exceed 2 hours.

7. The nylon mesh cloth and artificial tanning leather on the running shoes are relatively easy to maintain. You can wash it with a sailor. It is best not to soak it with a washing machine or soaked with water.

8. Wash the shoe and laces with neutral soap/powder.Take out the insole when washing the shoes, brush it gently with a soft brush, and then rinse dry.

1. How is the GPS positioning system positioning

The 24 GPS satellites run around the earth at a high altitude of 12,000 kilometers from the ground, so that at any moment at any time, any at all at the ground can be observed at the same time.

Because the position of the satellite is accurate, in the GPS observation, we can get the distance from the satellite to the receiver. Using the distance formula in the three -dimensional coordinates, the three satellites can be used to form three equations to solve the position of the observation point (x X, y, z).Considering the error between the clock of the satellite and the receiver clock, there are actually 4 unknown, X, Y, Z, and clock difference, so the 4th satellite needs to be introduced to form 4 squares to solve, so as to obtain the observation point of the observation pointLavels and heights.

In fact, the receiver can often lock more than 4 satellites. At this time, the receiver can be distributed into several groups according to the satellite constellation, and each group is 4, and then the group with the smallest error is selected by the algorithm for positioning, thereby positioning, so asImprove accuracy.

Due to the errors of satellite Running tracks and satellite clocks, the impact of atmosphere on the signal of the flow layer, the ionization layer on the signal, and the artificial SA protection policy, the positioning accuracy of the civil GPS is only 100 meters.In order to improve the positioning accuracy, the differential GPS (DGPS) technology is generally adopted to establish a reference station (differential table) for GPS observation. The accurate coordinates of the known benchmark station are used to compare the observation values to obtain a correction number and release it outside the outside world.EssenceAfter receiving the correction number, the receiver compares it with its own observation value, eliminates most of the errors, and obtains a more accurate position.Experiments show that the positioning accuracy can be increased to 5 meters by using differential GPS.

vehicle navigation system is mainly composed of navigation hosts and navigation display terminals.The built -in GPS antenna will receive at least 3 data information transmitted from 24 GPS satellites surrounding the earth, thereby determining the current location of the car.The navigation host is matched with the electronic map data determined by the GPS satellite signal to determine the accurate location of the car in the electronic map.

On this basis, various functions such as driving navigation, route recommendation, information query, and playback AV/TV will be realized.Drivers only need to watch the screens on the display and listen to voice prompts, and manipulate the remote control in the hand to achieve the above functions, so as to drive easily and freely.

Global Positioning System is the second -generation satellite navigation system in the United States.It was developed on the basis of the Ziwuyi satellite navigation system, and it adopted the successful experience of the Wuwuyi system.Like the Ziwuyi system, the global positioning system consists of three parts: space part, ground monitoring, and user receiving machines.

According to the current plan, the space part of the global positioning system uses 24 satellites with a height of about 20,200 kilometers to form a satellite constellation.21 3 satellites are near -circular orbit, and the operating cycle is about 11 hours and 58 minutes. It is distributed on the six orbit planes (four on the surface of the orbit), and the orbital inclination angle is 55 degrees.The distribution of satellites allows more than four satellites at any time around the world at any time, and can maintain a good positioning and solving geometric graphics (DOP).This provides continuous global navigation capabilities in time.

The ground monitoring section includes four monitoring stations, one upward injection station and a main control station.The monitoring station has a GPS user receiver, atomic clock, a sensor collected by local weather data, and a computer that processes preliminary data.The main task of the monitoring station is to obtain satellite observation data and send these data to the main control station.The main control station is located at the Vanden Fort Air Force Base.It implements comprehensive control of the ground monitoring department.The main task of the main control station is to collect all observation data of the GPS satellites in each monitoring station, and use these data to calculate the orbit and satellite clock of each GPS satellite.The upward injection station is also located at the Vanden Fort Air Force Base.Its task is mainly to inject such navigation data and the instructions of the main control station into the satellite when each satellite runs to the sky.This injection is performed once a day for each GPS satellite and the final injection before the satellite leaves.

The global positioning system has the characteristics of good performance, high accuracy, and wide application. It is by far the best navigation positioning system.With the continuous improvement of the global positioning system and the continuous improvement of software and software, the application fields are continuously developing. At present, the various departments of the national economy have begun to gradually penetrate people's daily life.

2. Positioning principle of GPS navigation

d1 = [(x1-x2)^2 (y1-y2)^2 (Z1-Z2)^2]^1/2 c (vt1-vt0)

d2 = [(x2-x)^2 (y2-y)^2 (Z2-Z)^2]^1/2 c (vt2-vt0)

d3 = [(x3-x)^2 (y3-y)^2 (Z3-Z)^2]^1/2 c (vt3-vt0)

d4 = [(x4-x)^2 (y4-y)^2 (Z4-Z)^2]^1/2 c (vt4-vt0)

In the above four equations, the coordinates of the measuring point X, Y, Z, and VTO are unknown parameters, where DI = C TI (i = 1, 2, 3, 4).

DI (i = 1, 2, 3, 4) is satellite 1. Satellite 2, satellite 3. Satellite 3. Satellite 3, satellite 4 to receiver.

TI (i = 1, 2, 3, 4) is satellite 1. Satellite 1. Satellite 2. Satellite 2, satellite 3, and satellite 4 signals to reach the time of the receiving machine.

C is the speed of transmission of GPS signal (ie, the speed of light).

The meaning of each parameter in the four equations is as follows:

X, Y, and Z is the spatial right -angle coordinates of the coordinates to be tested.

XI, Yi, Zi (i = 1, 2, 3, 4) are satellite 1. Satellite 1. Satellite 2. Satellite 2, Satellite 3, Satellite 4's spatial right -angle coordinates at the time of T, can be obtained by satellite navigation.

VT I (i = 1, 2, 3, 4) is satellite 1, satellite 2, satellite 3. Satellite 3, and satellite 4 satellite clocks, which are provided by the satellite star calendar.

VTO is the bell of the receiver.

From the above four equations, the clock vTO of the coordinates of X, Y, Z and the receiver at the above four equations.

The basic positioning principle of GPS is: satellite sends its own star parameters and time information uninterrupted. After receiving this information, the user receives the three -dimensional position, three -dimensional direction, and time information of the receiver.

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What should I do

1. Wash with soap, toothpaste or detergent. When cleaning, you need to pay attention. Wipe it gently with a soft wet cloth.

2. Apply soap or toothpaste, and use a soft brush with a soft brush with water.

3. When drying, the toes of the insoles are facing down, dried in the ventilation, and the white part of the shoe body is wrapped in toilet paper to avoid exposure.

4. Pay attention to daily maintenance. Do not wear it on rainy days. You can also wear less in mud roads. Suitable for shopping malls, roads, squares, floor sections.

5. Avoid stepping on sharp and fine stones, otherwise the materials on the soles of the feet will be tied out of small holes.

Which Adidas Boost series is better

1. Adidas Originals EQT Support 93/17

EQT is a classic shoe designed by Adidas in 1993.Today, Adidas has completely reshaped these shoes. The improved EQT is equipped with Adidas Primeknit upper, and incorporates a large thick BOOST midsole.The new improvement in retro styling has renewed this pair of EQT SUPPORT 93/17.The large -area midsole brings an unprecedented foot experience to EQT SUPPORT 93/17. Compared with running shoes like UB, EQT SUPPORT 93/17 is more suitable to become casual shoes for daily travel.

2. Adidas Inki Runner Boost

Adidas Iniki was designed in the 1970s and was one of the classic adidas shoes.Adidas Iniki is equipped with a large area of Boost midsole, which brings feedback, and basically kills mainstream UB, NMD and other styles.The only defect is that the breathability and wrapping are lacking. Inki upper is made of nylon, the toe and the heel are suede, and the inner lining is replaced by the elastic mesh.Without the blessing of the Primeknit upper, it is naturally impossible to compare with mainstream running shoes in terms of wrapping.

3. Adidas Ultra Boost4.0

As soon as UB is listed, it is under the name of the strongest running shoes. Indeed, having Boost's UB is indeed unique in the Running shoe industry.It should not be denied that UB is a good pair of sneakers. Whether it is daily travel or occasional exercise, UB is a good choice.

4,Yeezy Boost 350 V2

Yeezy Boost 350 V2 is also the coconut shoes in our mouths. The big sole is filled with Boost midsole, which provides a good foot feeling. With the perfect design, it can be said to be a great shoe.

5. Yeezy Boost 700

700 is also ugly shoes, daddy shoes.The retro appearance design and a thick feeling make this pair of shoes have the title of ugly shoes, but it is really handsome after getting on the feet.Of course, this shoe is also equipped with Boost midsole technology, and the foot feels very good.

Adidas shoe clothing recommendation & gt; & gt;