Special Meaning of Tungsten
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- Category: Tungsten Information
- Published on Thursday, 09 May 2013 09:09
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This article is going to talk about special meaning of tungsten.
Due to unique properties and irreplaceable purposes in broad fields, tungsten is an important rare metal that has a special strategic significance. For China, tungsten is one of mineral resources that has the most dominant position in the world.
Tungsten and tungsten alloys are widely used in iron and steel industry, equipment manufacturing industry, information industry, electric power, petrochemical, aerospace and military fields. Hard alloy in which the tungsten carbide is the main raw material is known as the "industrial teeth". Hard alloy is extremely important functional material in modern industrial, defense application and new and high technology application. In China's national economy, tungsten plays a very important role.
Because the strategic position of tungsten, major industrial countries classify tungsten as strategic reserve, particularly the United States, Japan. Other developed countries are on the increase in tungsten reserves.
China's tungsten reserves, production, trade and consumption all reside the first in the world. Along with fast and steady growth of our economy, our tungsten consumption receives steady growth and consumption of tungsten resources get rapid.
Nowadays, international situation is full of wind of change and uncertainties of developing global economy are increasing. Special meaning of tungsten requires us increase tungsten strategic national stockpile (includes tungsten resourcSpecial Meaning of Tungstenes and tungsten product).
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Types of Dartboards
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- Category: Tungsten Information
- Published on Wednesday, 08 May 2013 18:02
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Wooden Dartboard
Dartboard is made of corkwood or elm in early days, maintenance is a trouble for the wooden dartboard , it needs to take dartboard into water every evening in case of deforming caused by drying. Now it is hard to find the wooden dartboard but in some very particular bar in occident.
Paper Dartboard
Paper dartboard is made by tightly rolled paper with iron straps outside, it is one of the cheapest dartboards.
Flocking Dartboard
The main gasket material of flocking dartboard is also the paper, the difference is flocking dartboard embedded with a layer of fiber on the surface compared with paper dartboard, and this type dartboard is characterized by economy and beauty.
Magnetic Dartboard
Magnetic dartboard is made of iron, so all magnetic darts do not have tips, there is a piece of flat magnet at the top of the dart. This kind of dart is safer, and it will not hurt people or destroy furniture and wall when play.
Bristle Dartboard
Bristle dartboard is the most popular and best quality dartboard nowadays, it is also the appointed dartboard for regular games. Bristle dartboard is made of sisal fiber. The high quality bristle dartboard made in UK is adopting sisal hemp mainly from Kenya in Africa, and the material of bristle dartboard made in China are from Hainan, so bristle dartboard is commonly called as Joan Hemp dartboard by many people. Compared to other dartboards, it is more complicated to produce a bristle dartboard, first, processed sisal into compacted shapes by more than 10 tons high pressure, and then reinforce with iron straps outside. Therefore, a good bristle dartboard is with moderate hardness, when pull out darts from the dartboard, the hole can close automatic, so its life time much longer than dartboard made by other materials.
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Throwing Darts: The Art
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- Category: Tungsten Information
- Published on Wednesday, 08 May 2013 17:16
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A good dart throw begins with a good stance. It is best to align the body so that the throwing arm is forward. A right handed dart thrower will want his or her right foot next to the toe line. The body, should be aligned from 45 to 90 degrees from the toe line, with the opposite foot back. If the opposite foot is forward the thrower will have to sling the dart across the body. This makes for a longer throw. Also throws become awkward when the body is parallel to the oche.
Next it is important to develop a consistent grip. Probably the easiest grip for most beginners will be the pencil grip as this is familiar. However, the dart may be gripped in a variety of ways. The key is to use the thumb to push the dart against two or more fingers. Keep the point stabilized and pointed slightly upward. The dart, no matter how hard it is thrown (because of gravity) is going to travel in an arc.
Take advantage of this arc. Throw the dart so that its trajectory is along an arcing path. The amount of arc will depend upon the speed of the throw. The angle of arc will accelerate as the dart begins to drop, so a certain amount of impetus must be given in order to make accurate throws. To maintain the highest accuracy, the thrower should not make extreme variations in flight speed or grip. Continuous practice with a particular style and speed will allow the thrower to gauge where the throw will strike the board based on the angle of the throw to the oche and the angle of release.
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Throwing Darts: The Science
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- Category: Tungsten Information
- Published on Wednesday, 08 May 2013 17:20
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Dart throwing is done with the arm. Do not move the body or shoulder during the throw. The elbow is fixed when pulling the dart back, but raised slightly when the dart is flung forward. This allows the hand to better follow the trajectory of the dart. Many experts use a wrist snap that makes the entire movement of the arm rather like the crack of a whip. This imparts speed to the dart. However, it is an advanced movement and may degrade accuracy for the beginner.
Some beginners do not pull back the dart when throwing. This is a mistake as it makes it difficult to get enough acceleration from the dart to reach the board with accuracy. Also it is important to follow through. One way to do this is end the throw by leaving the throwing arm extended with the hand pointing at the target. Try to avoid the dart wobbling in flight. This is usually caused by the dart being thrown at too much of an angle to the path of flight. The dart flights attempt to correct, and this causes the wobbling motion.
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Darts: Various Rules
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- Category: Tungsten Information
- Published on Wednesday, 08 May 2013 17:10
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The two most popular games played by dart players around the world are "301" and "Cricket". 301 is the most obvious. Each side begins with 301 points and throws their darts in an effort to reduce their score to zero.
Before points may count a player must first hit a double. The score is then quickly reduced toward zero. The real skill comes in at the end of the game when a player must throw a double or bull's eye that reduces the final score exactly to zero. Any series of three throws (one turn) that would reduce the score beyond zero do not count.
Each game is considered one leg. The match is won when two out of three games are won.
Cricket is a more intricate game requiring more throwing skill and strategy. It is played using primarilly the numbers 15 through 20 and the bull's eyes.
At the begining 15 through 20 and the bull's eye are eligible to be opened. To open a number, a player or team must score three of that number (any combination of singles doubles and triples). Once a team opens a number every subsequent score on that number increases the score for the team. The opposing team may not score on that number. But may attempt to close it by getting three scores on that number.
For example side A scores once on 17. He gets no points but his score accumulates. Side B scores four times on 17 (a double and two singles). The first three scores open the number for B. The fourth score gives B 17 points. Now A strikes 17 three times. The number is now closed for everyone. A gets no points, but does have the satisfaction of not allowing B to get any more points on 17.
In attempting to open and close the bull's eye, the inner is counted as a double and the outer is counted as a single bull.
The game ends when all of the numbers are closed off. However, it may be declared over sooner if the player in the lead closes all posibility of the other side scoring.
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