More than 500 years ago, dart spent a long time to development.the United Kingdom soldiers who had been ejected in battlefield, it was competing with the bow and arrow was a weapon aiming at a specific target in the battle of leisure has been said that it is roots you.

Then, they throw using only arrow without a bow, target also changes to what was a large tree in round slices, it went a current form. Then it spreads around the world, and led to dart development to boom of today is transmitted to Japan.

Darts, unlike normal sport (competition), rather than the addition competition basically, it is subtracted competition. Therefore, you can feed the judgment that thought of computational power and earlier. Mental target competition, strengthening of the autonomic nervous, concentration sustained enhancement, in addition to the stimulus to the cerebral cortex, because the competition that you respect the manners, such as manners of discipline is attached to the body, the youth as Education and Sports. If there is a wide range of improvements and utility stood, we come to be recommended.

In addition, upon the aging society, and that the momentum is not so many, improvement of physical function, as rehabilitation and blur prevention, including the recovery effect, now not only the competition purposes, as education and lifelong sports, both young and old making it familiar.

More than 500 years ago, dart spent a long time to development.the United Kingdom soldiers who had been ejected in battlefield, it was competing with the bow and arrow was a weapon aiming at a specific target in the battle of leisure has been said that it is roots you.

Then, they throw using only arrow without a bow, target also changes to what was a large tree in round slices, it went a current form. Then it spreads around the world, and led to dart development to boom of today is transmitted to Japan.

Darts, unlike normal sport (competition), rather than the addition competition basically, it is subtracted competition. Therefore, you can feed the judgment that thought of computational power and earlier. Mental target competition, strengthening of the autonomic nervous, concentration sustained enhancement, in addition to the stimulus to the cerebral cortex, because the competition that you respect the manners, such as manners of discipline is attached to the body, the youth as Education and Sports. If there is a wide range of improvements and utility stood, we come to be recommended.

In addition, upon the aging society, and that the momentum is not so many, improvement of physical function, as rehabilitation and blur prevention, including the recovery effect, now not only the competition purposes, as education and lifelong sports, both young and old making it familiar.

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Separation of tungsten and molybdenum in production process of ammonium paratungstate is important working procedure ,but this is always one of difficult technical problems .General flows of various ammonium paratungstate technologies and basic nature of molybdenum were summarized .Moreover advantages and disadvantages of each separation method for tungsten and molybdenum in production process of ammonium paratungstate were systemarically analyzed .A nalysis results indicated that there many advantages , such as short process folw small tungsten loss, good molybdenum eliminating effect, simplicity of operation,low environmental pollution and economy feasibility to eliminate molybdenum by ion-exchange method . It is precisely because of these advantages, ion-exchange method to eliminate molybdenum has a good industrial application prospect.

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By evaporating and neutralizing of two ammonium tungstate with different density ,crystals of ammonium paratungstate (NH1)10W12O11·Nh2o(n=11,7,5)were prepared with ultrasonic .UsingXRD,DTG and granularity analysis, the crystalline form was confirmed and researched .The results proved that the effect of ultrasonic on ammonium tungstate was in evidence .The crystalline forms were the same with ultrasonic and without ultrasonic, but impure apexes on the XRD patterns were less and value of d/A more tallied with literature with ultrasonic . Distributing of crystalline granularity became narrower and the crystal was more homogeneous. Ultrasonic shortened the formation time nucleus of crystal .

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Ammonia in APT crystal mother liquor was removed by adding sodium tungstate with sodium hydroxide and magnesium salts. The results show that the content of ammonia in the treated solution can be removed down to 0.042g/L up to 98.8 ％ removal rate. The resultant sodium tungstate solution was diluted 10 times befote prepared as ion exchange feed solution., the content of ammonia in the raffinate is less than 0.0005％, which can meet China national discharge standard .

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A refractory metal tungsten carbide hard metal compound and a binder made by powder metallurgy method, its hardness (HRA) is 89 to 94, much higher than the high-speed steel; at 540 ℃ hardness (HRA) 82 to 87, and the hardness of high-speed steel normal temperature (HRA83 ~ 86) fairly, but also has good chemical stability, heat resistance advantages. Tool materials currently used for a lot of variety though, the new tool materials are also emerging, but still very popular tungsten carbide tool material kind.

In order to prevent the material as a result of crack propagation due to the failure, and is favorable for obtaining a high-performance tungsten carbide cutting tools material may gradient processing, the surface area of the coated substrate formed lack toughness cubic tungsten carbides and carbonitrides of region, this region is higher than the binder content of the nominal binder content of the coating substrate; when a crack is formed in the coating extended over the area, because of their toughness, crack propagation can absorb the energy, it is possible to effectively tungsten carbide cutting tools to prevent cracks internal expansion, improve the performance of tungsten carbide cutting tools.




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The extremely sharp and smooth enough neat cutting edge machining to have a specific, smooth shape, and edge rounding mostly waterfall edge, this process is called edge passivation. tungsten carbide cutting tool edge passivation change the contours of the cutting edge and morphology, but also to improve the microstructure of the blade surface area, thereby affecting the cutting process, tool performance and workpiece quality. tungsten carbide cutting tool edge passivation impact, affecting mainly the following aspects: the distribution of cutting temperature, the size distribution of cutting force, stress and strain, and chip formation and chip flow, deformation region of the workpiece, the workpiece surface integrity (residual stress), the machined surface roughness, surface hardening process and tool wear resistance.

Edge passivation tungsten carbide cutting tools for working efficiency has an important role in the following cases generally require the tool edge passivation:
1. The new sharpening of tungsten carbide cutting tools or regrinding of tungsten carbide cutting tools.
2. Prior to the tungsten carbide coating.
3. When the impact of heavy-duty cutting or cutting edge tungsten carbide cutting tools needed to passivation.




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High quality tungsten alloy penetrator is an important symbol of national materials technology development, but also an important material for high performance kinetic energy penetrators, which will be related to the development of standards to improve our standard of weapons and equipment needed can win a local war.

To this end, it should address some of the issues and the actual needs of the existing one hand, vigorously strengthen the management and coordination of military material development project, on the other hand should further improve the scientific management level of research institutes and universities to form a kind of systematic and highly complementary mechanism, and created a high standard of professional research team, in order to promote China's missile tungsten alloy materials technology to develop low-input, high output, high standards and high availability of direction. And should strive to achieve a breakthrough in the short term in some key technologies in order to be able to significantly improve the overall performance of armor-piercing tungsten alloy material.




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There are some options for outs with 2 darts left in hand.This is the "magic" number range. If you want to have a "guaranteed" dart at a double then you have to go for the single that leaves bull's eye.

A dart thower need to respectiving single's  treble and take right way. The first region from70 to 61contains 4 numbers that can be shot out with 2 darts over the bull's eye. Here we go :( Trebles, doubles, singles: T20: treble 20D20: double 20 20: single 20 orT13: treble 13D13: double 1313: single 13and so on...)

2Dart outs 70 - 61

This is the "magic" number range. If you want to have a "guaranteed" dart at a double then you have to go for the single that leaves bull's eye. This will give you the chance to leave a "normal" double (although often a "bad" one) if you hit the treble, and the "emergency exit" on bull's eye if you hit the single. Logic behind it: We go for the treble 'cause a bad double is still better than the difficult bull's eye; and a chance at bull's eye is better than no chance at all.

If you have time for percentage play then you should treat this region as if you had 3 darts for it. This path is given here with the red dot mark (you shouldn't play it if you have to go out in 2!), combined with the percentage sign.

70     best option T20 - D5 (20 - D25) avoid this! 6 dart out percentage play T18 - D8

69     best option T19 - D6 (19 - D25)

68     best option T18 - D7 (18 - D25) avoid this!6 dart out percentage play T20 - D4

67     best option T17 - D8 (17 - D25)

66     best option T16 - D9 (16 - D25) avoid this! T10 - D18

65     best option T15 - D10 (15 - D25) avoid this! 25 - D20

64     best option T14 - D11 (14 - D25) avoid this! 6 dart out percentage play T16 - D8

63     best option T13 - D12 (13 - D25) avoid this! T17 - D6

62     best option T12 - D13 (12 - D25) avoid this! 6 dart out percentage play T10 - D16

61. best option T11 - D14 (11 - D25) avoid this! 25 - D18 *avoid this! 6 dart out percentage play T15 - D8

A dart thower need to respectiving single's  treble and take right way.

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Dart throw should grip and stance just follow the requirements . You will benefit more when you know the connections.There is only one proper stance that fulfills the requirements for throwing: The right foot (left foot for left handers) forward stance.

First , We get this when we look at the aiming position. When we aim we put the target, the dart and the eye in one line. When we throw we should try to put the 3-lever system of the arm in a 2-dimensional plain. This reduces the margin of error by eliminating sideway movements of the arm. Thus it's easy to work out that we won't get happy with a frontal stance whith both feet touching the throwing line. Maybe this would be more comfortable, but we can't use it.

Second,in an optimum stance the soulders and the board form a 90 degrees angle, and so does the line from the forward foot to the behind foot. But most people find this highly uncomfortable or even impossible. So Dart throw just follow the requirements and find a compromise

Then,the shoulder angle:It defines the stance. You should try to get close to the perfect 90 degrees, but not with an absolute sacrifice of throwing comfort. Proper angles start from approx. 50 to 80 degrees. The exact value here is your personal compromise.

Finally,the feet angle:The feet angle simply follows the shoulder angle, otherwise you will fall on the floor.

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In every point of the throw dart you must stay perfectly balanced. This will be tricky for beginners and force them to start at a lower angle without leaning forward much.

Leg:Your balance leg is responsible for this work. Lifting it during the throw is not recommended, although it does by some pros, but these players have such a perfect balance they will still beat you with only one foot on the ground. Again, don't 'jump' when throwing - 'one foot on the floor' is not only a billiards rule. Highly recommended for darts players, too. Your balance foot shouldn't be flat on the ground (only okay for beginners), just the toes should touch it.

Torso: Your stance must guarantee that your body doesn't move at all when throwing. Remember the fixed shoulder joint of chapter 1. Don't arch your back, keep your spine straight. Your body must be strained, but your arm must stay relaxed.

As a summary, Throw dart you must stay perfectly balanced.stance is the least difficult, but an important matter. Don't start with a frontal stance, this will disturb all other technical necessities, and you will find yourself struggling sooner or later.

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