1. What is the structure of speed skating knife and shoes

One of the most important equipment of the skating project is the ice knife on the feet. The structure of the ice knife of different ice skating projects is also different. Speed skating knife shoes are ice -knife shoes worn on speed skating. There are two types of short track speed skating and avenue speed skating. TheyAlthough there is a large difference in appearance, its structure is basically the same, mainly consisting of the following parts:

1. Ice knife:Speed skating emphasizes the speed of gliding, so the ice knife is long, the blade is narrow and flat, and the ice knife of the speed skating knife shoes is only fixed with the ice shoes. This structure can extend the athlete's pedal distance and allow the athlete's ankle activity to increase the amplitude of the ankle joint activity.Large, Smooth exercise.

2, knife support:The knife holder of the speed skate shoes is fixed on the soles of the shoe by two points, which can move the position of the ice knife left and right. Generally, the short -sized skate -shoe ice knife has a higher knife.It will contact the ice surface; the avenue speed skating knife shoes are low.

3. Boots:The boots of speed skating knife shoes are generally made of carbon fiber and thermal shrinkable plastic shoe shells. While reducing the quality of ice shoes, the rigidity is improved, the leg load is reduced, the stability of the support is strengthened, and the stability of the support is enhanced.efficiency.

2. What is the principle of speed skating knife shoes

The structure of the speed skate shoes and the other two types of Ice knife shoes is different, but the basic principles are the same, mainly using ice knife to pedal ice, so as to slide on the ice. The specific principle is:

As we all know, people can walk on the ground because the soles and the ground have friction. The greater the friction, the more stable people can walk.And ice skating is just the opposite, the smaller friction can make the movement smoother.After putting on Ice knife shoes, there is a layer of water in the contact position of the ice knife and the ice surface. This layer of water plays a lubrication effect, so that people can slip on the ice surface. There are several different reasons for the cause of this layer of water:

1. The theory of stress fusion

The ice knife puts a lot of pressure on the ice, which will melt the ice surface and cause a thin water layer.When a person passing by, the pressure on the ice disappears, and the part of the water layer will re -condense into ice.

2. Surface melting theory

In recent years, the physics community has had a lot of doubts about this theory.If the role of stress melted the ice surface, it is obviously unrealistic that the athlete's weight can reach at least 175 kg to provide sufficient pressure, so the pressure effect is not the main reason for the melting of the ice surface.As a result, scientists also proposed the "surface melting theory", and its intention is that the surface of the ice always has a layer of water that will not melt; the higher the temperature, the thicker the water film, it is the lubrication effect of this layer of water.This is also a saying widely recognized in the physics community.

In general, the principle of Ice knife shoes is to lubricate the water film generated by the ice knife melting the ice surface, reducing the friction between the ice knife and the ice surface, so that people can glide on the ice surface.

1. Where is the difference between mountaineering shoes and sports shoes

1. Function

There are significant differences in mountaineering shoes and sneakers, which is one of their biggest differences.

mountaineering shoes are shoes designed for outdoor activities such as Hiking travel and climbing, which have functions such as non -slip, abrasion resistance, and piercing.It focuses on ensuring the safety of wearers and providing sufficient support and cushioning function, which has better protection and support for Hiking travel and climbing.And some high -level Climbing shoes will also be equipped with ingredients and other equipment to provide additional protection for climbers.

And sports shoes are mainly used for daily sports activities and leisure wear. Its main functions are shock absorption, breathable, lightweight, etc. It is used for daily sports and leisure activities. It is suitable for long -term walking and outdoor activities. And outdoor activities such as climbing cannot provide sufficient guarantees.

2. design

mountaineering shoes usually use high -top design to strengthen the support of shoes.Its laces use the shoe laceer system, which can lock the feet firmly.At the same time, the soles are thicker than sneakers. There are internal insoles, support parts, cushains and other components inside, and have a better anti -slip effect.

sports shoes generally use low -top design, focusing on breathability and lightness.The design of the shoe and soles is relatively simple, thin and light, and is more suitable for flexible sports and comfortable dressing experience.Some sneakers use air cushions and shock absorption technology to provide better comfort.

3. Material

mountaineering shoes mainly use leather, nylon and polymer materials. It has a good performance in the weight of the shoes, the hardness of the shoe, and the waterproof moisture and prevention.Some hiking shoes also have built -in film or waterproof film for waterproof.

sports shoes use lightweight materials such as foam and fit materials, which are better breathable and can provide more comfort.

2. Which of the mountaineering shoes and sports shoes is better

mountaineering shoes and sneakers are very different in design and functions.Climbing shoes are usually stronger and durable to meet the needs of walking on rugged mountains.sports shoes are usually designed to be lighter and breathable to meet the needs of sports.

mountaineering shoes usually have higher rag collar, closer shoelace systems, thicker sole, and more non -slip outsole to ensure the stability and safety on rugged mountains.mountaineering shoes usually also have special functions such as water resistance and cold resistance to cope with various bad weather and environment.

sports shoes pay attention to breathability, lightness and wearing resistance, so as to adapt to sports during sports, fast and flexible exercise.sports shoes usually have thinner soles and softer midsoles to improve the flexibility during exercise.sports shoes usually also have special functions such as shock resistance and cushioning to reduce physical pressure on the athletes.

All in all, the design and function of mountaineering shoes and sneakers are obviously different, so there is no good or bad between the two. What we need to do is to choose different shoes on different occasions to adapt to different environments.

[Sunglasses] What problems do you need to pay attention to when you buy Sunglasses in Sunglasses?

The strong sunlight contains a large amount of ultraviolet and infrared, which may damage the cornea, crystal, and even the bottom of the eyes. Wearing a pair of Sunglasses can cover or absorb a part of the light to reduce the stimulation of the eyes.In recent years, due to everyone's importance to health, many When people go out in the hot summer, they all like to wear Sunglasses to reduce the stimulus of sunlight. Some people also like to decorate it.Sunglasses There are many types of types, and they should be selected according to different needs.

What are the color of Sunglasses

Pink lens

This is a very common color.It can absorb 95%of ultraviolet rays, and some short wavelength visible light.In fact, such functions are similar to general color lenses. This means that pink lenses do not have a greater protection effect than ordinary lenses.But for some people, it is still quite psychological to help, because they feel more comfortable to wear.

Gray lens

Absorbing infrared rays and 98%ultraviolet rays.The biggest benefit of gray lens is that the original color of the scene is not changed due to the lens, and the biggest is satisfactory that it can effectively reduce the strength of the light.

Green lens

Green lenses can be said to be represented by the "Ray Peng series" lenses. Like gray lenses, it can effectively absorb infrared light and 99%of ultraviolet rays.But green lenses can make the color of some scenes distorted.Moreover, the effect of blocking light is slightly inferior to gray lenses. However, green is still not excellent protective lenses.

Brown lens

This kind of lens is similar to the type of light of light, but it absorbs more blue light than green lenses.Brown lenses cause color distortion than gray and green lenses, so the satisfaction of ordinary people is also lower.But it provides another color choice, and it can slightly reduce the halo of the blue light to make the image clearer.

Yellow lens

It can absorb 100%ultraviolet rays, and allows infrared rays and 83%visible light penetration lenses.The biggest feature of yellow lenses is that most of the blue light is absorbed.Because when the sunlight is too atmospheric, it is mainly expressed in blue light (which shows why the sky is blue).After the yellow lens absorbs the blue light, it can make the scenery of nature more clear. Therefore, yellow lenses are often used as a "filter", or hunters are used when hunting.However, no one can prove that the shooter is better because of wearing yellow glasses.

What problems need to pay attention to when buying Sunglasses

Medical experts suggest that when you buy Sunglasses, you can judge according to whether the vision is clear.To buy high -quality Sunglasses, the only thing that can do is to buy Sunglasses in optical specialty stores and regular glasses shops.

The human body has the instinct of self -protection. When the eyes encounter strong light, the pupils will naturally become smaller, making the ultraviolet energy of the eyes enter the eyes decrease. Once wearing glasses without ultraviolet function, it will enlarge the pupil.The glasses do not have the effect of isolation of ultraviolet rays. At this time, the eyes are equal to the portal opening, and letting ultraviolet rays enter, the damage to the eyes can be imagined.

Sunglasses can block ultraviolet rays because a special layer of coating film is added to the lens, and inferior Sunglasses not only cannot block ultraviolet rays, but also severely reduce the light transmission of the lens, make the pupils larger.Damage.In addition, inferior lenses also cause visual fatigue symptoms such as nausea, forgetfulness, insomnia.

The color of Sunglasses is superior, followed by light gray, tea, or light smoke, followed by green, amber, blue, etc. Red is used as a sunbathing or snow.

It is best to use polarized Sunglasses in a car because they can weaken the dazzling strong light.

If you can see your eyes very clearly after you put on Sunglasses, then your lens color is too light.

When the sun goes down the mountain, it is best to move to Sunglasses, otherwise, our vision will be affected in a weaker place.

You should choose a regular manufacturer to produce a Sunglasses in regular manufacturers at a regular glasses shop.

Pay attention to the surface of the lens when selecting.

Thin -faced people are suitable for round mirror frame Sunglasses.

Face -shaped mirror frame

Sunglasses are the focus of the entire face, which strongly outlines the outline of the face, just like a thick waist Belt highlighting the small waist of the skirt.What kind of face shape, what mirror -frame Sunglasses should we wear?The following is the suggestion of optometry Chen Huifen: MIU MIU ultra -thick plastic Sunglasses play black and white, and the feet design is clear.

1. Ellipse face shape: with Square, or smaller positive rectangular frame Sunglasses.This face is the most pleased, suitable for any kind of frame.

2. Round face shape: Sunglasses with larger lenses, the best frame with rectangular frames, outlines outline.

3. Face shape: with a round or elliptical frame, it is wide and light enough.

4. Mounthole face shape: with a piece of mirror frame.

1. What does training shoes mean?

What is training shoes?Many people have such a doubt, but for many sports -loving people, they still have a certain basic understanding of training shoes.Its full name is called comprehensive training shoes, which is mainly designed for the athletes who exercise reactions in basic sports. Some people call it "all -around shoes".

2. What are the characteristics of training shoes

The previous article has simply understood what training shoes mean, and let's take a look at the characteristics of training shoes!

1. Multi -functional:Comprehensive training shoes can adapt to a variety of sports scenes. Whether it is indoor or Outdoor, it can provide good performance.

2. Protection performance:Comprehensive training shoes pay more attention to the protection of the feet in design and material selection, especially in high impact areas, such as toes and shoes.

3. Comfortable experience:Good cushioning performance, breathability, and fitting design can provide the wearer with a comfortable training experience.

4, durability:Due to high -intensity training, comprehensive training shoes have been specially designed in durability, which can withstand long tests.

Third, the appearance characteristics of training shoes

training shoes are similar to running shoes, but the characteristics of training shoes are the wide design of the forefoot and the rear heel, which provides a strong adaptability and can meet various training needs.The upper is usually made of synthetic leather and lightweight mesh, and the midsole is used for cast mold EVA materials, which is close to basketball shoes in size.The sole is usually used for miracle rubber to ensure flexibility and abrasion resistance.

The structure of the training shoes includes shoe gangs, soles, soles and shoes and shoes tightly connected. The support body is set at the bottom of the front.Training experience.

1. The difference between hiking shoes and off -road shoes

1. design purpose and characteristics

hiking shoes are mainly suitable for outdoor activities such as Hiking, crossing, etc., focusing on non -slip, grip, wear resistance, and suitable for walking in rugged mountain roads, grasslands, snow and other environments.Path shoe usually uses leather or durable nylon, which has a stronger midsole, outsole and leather upper to provide better support protection and durability.A good pair of hiking shoes can support you for more than 1,000 kilometers, or even 1500 kilometers.

Off -road running shoes are mainly suitable for outdoor sports such as off -road Running, mountain marathon, etc., focusing on light, breathable, comfortable, and suitable for Running on rugged roads.Off -road running shoes are usually lightweight. The soles of the shoe are wear -resistant rubber. The upper is usually made of mesh eye material. It has good breathability and provides better grip and non -slip performance.

2. Applicable environment

hiking shoes are more suitable for moderate weight Hiking, mountaineering activities that require better support and protection, and use under complex and changeable terrain conditions, such as rocks, dirt, sand, wet tree mud or snow.

Off -road running shoes are more suitable for low -altitude complex mountains and urban commuting. Its lightweight design and good breathability make it while maintaining flexibility and lightweight, and can also meet the comfort requirements during Running.

3. Other differences

In terms of weight, off -road running shoes are usually lighter than hiking shoes. This is mainly because off -road running shoes pay more attention to lightweight in design, while hiking shoes pay more attention to support protection and durability.

In terms of breathability and waterproofness, off -road running shoes are more breathable because of the use of lighter fabrics such as wide mesh cloth.Both hiking shoes and off -road running shoes have waterproof and non -waterproof models, so the waterproofness is not much different.

2. Which of the hiking shoes and off -road shoes is better

Choose hiking shoes or off -road running shoes depends on your specific needs and usage scenarios.If you are mainly Hiking or mountaineering activities, you need better support protection and durability. hiking shoes are more suitable choices.And if you mainly do off -road Running or need to commute in the city, and pay attention to light and breathable, then off -road running shoes will be a better choice.