To make such a container like a vacuum bottle,one way is to get a jar with foam insulation it wrapped up.The reason why the heat insulating material works,for two reasons.First of all,the foam plastics are poor conductors of heat.Secondly,the air is trapped in the foam is not conducive to the conduction of heat.Thus reducing the conductivity.Since the air is separated into tiny bubbles,foam insulation and therefore also play a role largely eliminate convection inside the bubble.Therefore,the heat transfer through the foam for the very small.

The fact that there is a better thermal insulator than a foam - vacuo.Vacuum bottle is no atom."Full vacuum"does not contain any atoms.To achieve the full vacuum is almost impossible,but can be done near vacuum,no atom,can completely eliminate conduction and convection.

There is a vacuum bottle evacuated bile.Thermos interior glass layer,while the surrounding glass vacuum.Glass gall easily broken,so the package it in a plastic or metal housing.Many thermos can actually unscrew and remove the glass gall.

Vacuum bottle also goes a step further.A silver-plated glass (mirror-like) to reduce the infrared radiation.Vacuum and silver combination significantly reduces the heat convection,conduction and radiation.

So why thermos things will eventually cool down?Because there are two paths thermos heat transfer.Among them is the big stopper,the other is glass,it is the top of the outer wall thermos where the transfer of heat to produce a path.Although the heat transfer through these paths is small,but not without.

Vacuum bottle know whether the liquid inside is hot is cold?I do not know. Vacuum bottle do is limit the heat conducted through the wall thermos.That can make a thermos to keep the temperature inside the liquid is almost unchanged for a long time,whether it is hot or cold.

How much irrigation thermos flask, its insulation works best?

Thoughts: For this problem we can first do an experiment.

Experimental Equipment: thermos flask (four identical),water,thermometer

1、First understand thermos household may be used in the following situations:

(1) The water filled;

(2) When water is about to be filled,leaving a small amount of air;

(3) filling only half a bottle of water;

(4) Only a small bottle of water irrigation.

2、The four thermos by filling more than four cases on the same temperature water.

3、The four thermos place the same time.

4、Measuring the water temperature,the level comparison.

Experimental phenomena:find the second case (when the water is about to be filled,leaving a small amount of air) insulation works best.

Experimental results and the reasons:When the bottle with no irrigation and leave a small amount of air (the distance between the stopper and the water surface is generally 2 to 3 cm),thermos insulation effect for the best. Because the heat transfer efficiency of the water is four times that of air,that air is a poor thermal conductivity in the water,so that the heat of hot water bottle will less easily through the air layer above the water in the mass to pass stopper to go outside,so the insulation effect is better.Conversely,if the thermos filled with water,the water will be the cork wet,then the heat will water as media and quickly spread to the bottle,so the insulation effect on hearing.

According to multiple consumers experience feedback,vacuum flask how to use the right methods mainly include the following:

1,before use, first opened, and then use boiled water or add some detergent washed a few times,The role of high temperature disinfection, to kill bacteria

2,before use, please thoroughly clean vacuum flask lid,plug and cup body inside and outside,for preheating or precooling (filled with hot water or cold water,close the cork 5 ~ 10 minutes,pour out the water in the stainless steel vacuum cup),it can make heat/cold effect is better.

3,water don't act too full,so as not to tighten the lid,the boiled water spill burns;

4,do not use vacuum flask bubble tea;

5,after drinking,please tighten the lid and ensure health clean;

6,shoulds not be long cheng fang milk,dairy products and carbonated drinks such as fruit juice;

7,vacuum flask inside sometimes will produce some red rusty spot,can use warm water with diluted vinegar soak 30 minutes later,fully clean.

8,cleaning time with a soft cloth and the consumption of detergent cleaning when diluted with warm water,do not use alkaline opal white agents,chemical cleaning cloth,etc.,it is best to use the bottle brush, thoroughly clean the stainless vacuum flask inside.

9,in order to prevent odor or stains,and can be used for a long time to clean.After use,Please clean the fully dry.

Why so won the hearts of the Nike Air Zoom Flight The Glove?In fact,precisely because of its grand,durable,beyond,heroic,coherent and pure that six elements,was deeply affecting people's psychology.Nike Air Zoom Flight The Glove basketball shoes from the original has excellent and amazing transformation,then the Nike Air Zoom Flight The Glove calendar to play what role?

First:the evolution of the Nike Air Zoom Flight The Glove

From the outset endorsement by the well-known basketball player,has a basketball and cultural propaganda,so that we can have a better understanding of Air Force One.By now the nature of the Nike Air Zoom Flight The Glove (Air Force) has changed into a street fashion shoes,basketball shoes,rather than a pure sense.But its influence can never diminish,it has witnessed the rapid development of a quarter century of basketball.Now it has become the influx of people's wild shoes,is an indispensable trend object.

Second:Nike Air Zoom Flight The Glove has become old classic

Even Nike Air Zoom Flight The Glove has left the basketball court,but it's sport has been aired with everyone.And for innovation year old today has become a classic.If Nike created the Nike Air Zoom Flight The Glove,Nike Air Zoom Flight The Glove today it is no longer just belong to Nike,but has become a symbol of the sneakers culture.Today,Nike Air Zoom Flight The Glove Black White Red the most perfect interpretation of the vintage of the word.

For now,Nike Air Zoom Flight The Glove has been extended and now a lot of different styles of shoes,Nike Air Zoom Flight The Glove high-top shoes,Nike Air Zoom Flight The Glove shoes lizard lovers,retro Nike Air Zoom Flight The Glove,etc.,all have the former "vigorous figure",another modern trend elements,so we put it down!

Summer period,vibrant season,full of seasonal movement,the Nike Womens Air Max tailored for you to create a full summer period,so you aplomb in the sports arena or outdoor sports,so Nike Air shoes shoes which items are good?Here I will introduce a female Nike air shoes,you want to buy Nike shoes MM can refer to Oh!

Nike Air shoes women shoes nike shoes authentic Nike Air shoes Paul,this shoe is neutral shoes,also called a couple of shoes,so MM can buy together with their other half,in outdoor sports can cultivate their feelings.

First,comes the Nike Air shoes women,in fact,very important to toe,toe shoes are the easiest to judge the quality of the site.High quality shoes,toe rounded fullness,there will be a very beautiful arc.This would not squeeze the foot toe,foot feeling very good brings comfort.

Second,buy Nike Air shoes,women's shoes,pay attention to the cortex.Amplification effect shoe surface to see if clear lines without rules,this is an important indicator to identify leather with PU leather.

Third,Through transparent heel cushion to determine Nike Air shoes women. PAMP Air unsaturated air,will absorb high-intensity exercise brings a big impact,play a great damping effect.

Fourth,Nike hook cutting edge neat,clean and tidy,and noble qualities.The Nike logo always reflect the fullness of neat!

Select MTB a look at the frame,two watch parts,three watch assembly technology.After these three factors are combined scientifically,in order to be a good mountain bike.Specifically how to choose car?

First,the frame corresponding to the human skeleton,with the frame can be loaded on a variety of bicycle parts.Frame made ​​of iron, aluminum and other materials,according to the angle of the length of the pipe,etc.affect the characteristics of the overall configuration of the bicycle.Light,prison,elasticity and good frame is one of the objectives pursued,in order to achieve this goal,each frame depends on the manufacturer's processes.Most iron frame,however,the iron frame is also divided into adding other extreme iron frame in chrome-molybdenum steel,high strength steel,ordinary steel,etc.,joined the other ingredients,you can make such a thin pipe,making the overall frame lighter.Recently,on the basis of the intensity is not reduced,there has been the use of materials other than iron frame,such as aluminum.In a bicycle race in the use of titanium metal frame carbon fiber material.

Two.What is the best bicycle parts?Simple talk is both light and strong,and the performance is better.Because these conditions have a bike ride up was easy,safe and convenient.But to achieve all of the above conditions,you need good material.So,bicycle parts is often a specific factor about bike prices,like carbon mtb rim.

Third,the good parts if the assembly is not good,neither will be as attentive design by architect nor experienced craftsmen to build the house,make you nervous all day,for fear that it will collapse.So,if you do not want to buy later regret,you should understand that knowledge.General use bicycles within the city,in fact,there are many slopes within the city.For example,sometimes when you ride pedal feel suddenly heavy,with your eyes can not determine the slope often more.At this time,the role of transmission can be fully reflected,if there is transmission,it can be replaced at this time as long as the lighter gear to ease of riding.

Do you know what the bmx 451 rim protector?If you throw this question,I believe that not many individuals can answer correctly.First was explained,referring to the rim of the hub,the rim protector is protected by the hub. Tire wheel protection, by definition refers to the special design can play a role in protecting wheel tires.

The tire and rim protection runflat tire sidewall have adopted a more rigid rubber,there is no higher for installation requirements?You know,reinforced sidewall has a certain impact on the performance of the tire comfort,but also for the vehicle damping system also has higher requirements.Although the tire rim sidewall protection than no protection tire rim more rigid,but far from reaching and runflat tire sidewall strength,so do not ask damping system of the vehicle, as long as the specifications of all models are suitable installation.

Wheel tire rim protection to a certain extent for the protection of the damaged wheels a great help, even if it is installed with a tire rim protection is also not easy to pressure the road sub-teeth. Wheel scratched does not matter,but if the inside ply and steel layer broke,ranging from changing a tire,while driving safety crisis.Owners and friends try to avoid rubbing the road sub-teeth while driving,you do not want scratched wheels,buy tires have rim protection can play a role.

Through sexual cycling around is one of the main factors of efficiency,increase of wheel diameter can reduce wheel Angle when in contact with obstacles,roll over obstacles,the easier;29"Angle of attack Angle is smaller than 26" six degrees,27.5"smaller than 26" 4 degrees,26,maximum Angle of attack Angle,29 through sex is best,27.5" is very close to the performance of 29".

The greater the wheels on the other hand,the higher the center of the car,29,"center of gravity is lower than carbon 27.5 rim for grade efficiency,27.5" is better than 29" big wheels for climbing ability is significantly increased,26" climbing Angle 20 degrees,27.5"climbing Angle of 25 degrees,29" climbing Angle of 30 degrees.

From through performance compared with climbing ability,26"performance is better than the latter two,best 29",27.5"which is very nearly 29" for being limited by the physical geometry of asians,27.5"is the ideal choice for improving the efficiency of cycling and fun.

Large diameter wheel tire contact with the ground area is larger,there is a better grip,help to improve control performance,when the downhill good grip is further enhanced playability,rapid downhill,drivers can accurately grasp the road turns,but good grip can actively improve braking efficiency.

The same width of tire,26"smallest contact area and 29" to 26"ground contact area is large,27.5" between 29"and 26".

Since the 1970s,people began to use carbon fiber composites in bicycle design and manufacture of carbon fiber bike gradually become the development direction of high-level sports bike,attracted more and more attention.With the carbon fiber composite manufacturing technology becoming more mature,a significant decline in the price of carbon fiber,to promote research and development of carbon fiber bicycle.After years of development,carbon fiber composite materials have become high,mid-range mainstream bicycle frame material has been widely welcomed.

Carbon fiber composites have high strength,modulus,low density,good fatigue resistance,vibration,strong resistance to environmental performance,etc.,with its manufacturing carbon fiber bicycle frame has the following characteristics.

1,light weight,stiffness

2,good vibration resistance

3,anti-fatigue properties

4,anti-corrosion

5,structural design flexibility

Currently,the carbon fiber composite molding process are pasting molding,pultrusion,filament winding molding,RTM molding,braided molding,autoclave molding process method,which is most suitable for RTM molding process for manufacturing Carbon bike rims.

A bicycle Carbon 29er rim is set with a circular metal rim component and at least a reinforced resin material.Annular metal rim components include:annular tires attachment part,suitable for tire installed on it;The first ring wall part;The second ring wall part;As well as the inner ring wall part,will be described in the first and second ring wall parts connected,and multiple formed in the inner ring wall part of the spokes attachment to speak.At least a reinforced resin material attachment on the annular metal rim components are described,in order to make reinforced resin material stated from the first to the second ring wall sections across the inner ring wall ring wall part extends continuously,which covered the first and second ring wall part of the surface area and around the spokes entrained openings of the inner ring wall part of the external surface area.

Generally speaking,carbon fiber as bicycle material has the following features:

1.Light weight:1200 grams of carbon fiber highway has been everywhere.Due to the quality of the carbon is only 1.6 g/cubic centimeters,so make about 1 kg of frame is not the dream.

2.To absorb impact performance is good.The carbon fiber can effectively absorb vibration,and keep good rigidity.This characteristic makes it a good competition level material.

3.Can make all kinds of the shape of the frame.And general manufacturing process of metal frame,carbon fiber frame is commonly to make mould first,then pay in mould on carbon fiber,finally the cementation with epoxy resin.This process can make use of aerodynamics for the wind resistance tiny frame.