Besides, the pressure drop of tungsten carbide porous nozzle is one of the factors. The pressure is decreasing caused by the energy loss, which fluid flowing in the pipe to overcome the internal friction and collide with each other when the turbulence and momentum exchange fluid particles generated in the nozzle. It shows that it is the size of the total energy of the water flow. With the nozzle pressure drop increasing, the flow for rock cracking is growing, and the jet flow and water power is relatively enhancing so that the jet impact, shear and tensile stress have been strengthened, rock cracking ability has been improved.

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High-density tungsten alloy shielding is extremely strong and durable (typical hardness ranges from 24-32 RC), yet easy to work with. (They machine much like gray cast iron.) Tungsten alloy’s low-thermal expansion rate and resistance to breakage and chipping allow you to achieve very close tolerances and hold fine finishes.

There are some main machining technologies for tungsten alloy shielding:

• Turning: Positive rake tooling is suggested.  Triangle inserts TPG432 or TPG431 grade 883.
• Drilling: Carbide tooling is suggested. Increased clearance angles and automatic feeds are often used to avoid binding and seizing. Carbide drills will give a better tool life.
• Milling: Premium uncoated end mills with a regular spiral such as SGS. Insert cutters; use square multi-edge or single edge cutters, such as KC730. Also can use positive rake octagon cutters, such as Seco grade 883.
• Sawing or Cutting: When sawing, use a bi-metal blade; blade pitch should be relative to the thickness of the material. Material can also be cut using high-speed abrasive cutoff wheels.
• Stress Relieving: Stress relieving can be accomplished on machined parts. We suggest heating at 600°F in air for two hours and cool in air or in a protective atmosphere at 900°F for 30 minutes.

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Whether you need to protect sensitive electronic equipment or delicate human tissue, the energy-absorbing properties of tungsten alloys make them exceptional choices for radiation shielding applications, in both medical and industrial settings.

Tungsten alloys are used for radioactive source containers, gamma radiography, shields, and source holders for oil-well, logging, and industrial instrumentation. Those high-density alloys also serve as collimators and radiation shielding in cancer therapy, as well as syringe protection for radioactive injections. When you need to direct a specific amount of radiation to a targeted area, tungsten alloys provide the control you need. Tungsten alloys will continue to perform, even under extreme, high-heat conditions.

Compared to traditional radiation shielding materials, tungsten alloys provide excellent value. It is a high-density alloy can provide the same energy absorption as lead using 1/3 less material! Unlike lead, you’ll also reduce administration costs by eliminating the need to obtain special licensing—it’s not required.

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Soccer tungsten dart rule is a game for two players or teams only. It is a very difficult game but is great practice because only bulls-eyes and doubles count.

The Object: To be the first player to score ten "goals".

The Scoring: No scoring is needed if you can simply remember each player’s points from one to ten.

The Play: One player from each team throws one tungsten dart at bulls-eye, closest to the bulls-eye goes first.

In order to score a "goal", the players first must "take possession of the ball". To take possession, you must hit a bulls-eye (either a single or a double, it does not matter). Once you have possession, you keep the ball until the other player/team takes possession by hitting a bulls-eye.

Only the player/team that has possession of the ball may score goals. To score a goal you must hit any double on the board. The doubles are the thin outer ring and the inner-bulls-eye. Any double you hit anywhere on the board counts as one goal and scores one point for you or your team.

Strategy: There isn't any.

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Here are two practice guidelines for tungsten darts should incorporate the following:

Focus on your weaknesses. You know where you are weak. If not, pay attention to what happened to you the next time you lose. Did you take too long to close out your ’01 game? Did you choke on your out shot? Whatever your weakness, choose practice games that help you. Click here for a list of great practice games. For example, the game of 21 is great for Cricket practice. If you need work on your outs, try a game called 170. You need 170 points to finish and you count the number of tungsten darts to do it. The fewer the tungsten darts the more points you get. It starts with a three tungsten dart finish worth five points and decreases by one point for each additional tungsten dart, including negative points. The first one to close out 170 stops the round. The first one to 15 points wins the practice session.

Change things up & keep track of your progress. Let’s face it, practicing can get boring. The excitement of a match is what makes the tungsten dart game so intriguing. You can help stop practice from being a chore by changing your surroundings. Maybe you could practice where you just had a close match? Or go to a friend’s house to practice. Another great idea is to throw at a popular tungsten dart bar and challenge one of the local throwers, but use it as a practice session by focusing on your weakness throughout the match. The other important thing to remember is to keep track of your practice routines. Write down your results after you practice and track your progress. This can also help to reveal parts of your dart game that need special attention if you aren’t progressing over time.

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Practice makes perfect. That is as true for tungsten darts as it is for any other sport. If you want to play consistent and competitive tungsten darts you need to practice as often as possible. Some people recommend shooting at least one hour per day. However the amount of time you practice is irrelevant. How you go about practicing and sticking to a schedule are the two most important aspects of practicing. Here are a few pointers to consider.

Take it seriously. A practice session is not time spent throwing a few tungsten darts with friends, tungsten dart practice is serious business. You should approach practicing just like you would a match. Make sure to stay focused and work on a specific goal for each session. This is where the amount of time you spend practicing becomes irrelevant. If you set specific goals for each practice session then once you achieve those goals you can stop practicing. It isn’t about quantity, but rather quality of practicing.

Simulate a high-pressure environment. One of the best things you can do when practicing is to try to simulate the high-pressure situation of a real match. You can do this by shooting with someone who is also serious about practicing. You can also create pressure situations by using the clock. For example, give yourself 10 minutes to shoot as many double 20s as possible. Keep track of your high number and try to beat it. You can also replay an old match you lost, trying to change the outcome by shooting differently.

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Warfare tungsten dart rule is a simple game of elimination that may be made as easy or as difficult as you wish by simply adjusting the playable area of each number used. Because the entire board is used, it is very good practice. It may be played by two players or teams.

The Object: To be the first player to eliminate your opponents soldiers.

The Scoring: The score board is divided into two columns with the player or team names written at the top of each column.
Each player (or one player from each team) throws one tungsten dart at bulls-eye, closest to the bulls-eye goes first and chooses whether to be the "top" army or the "bottom" army.

The numbers 11, 14, 9, 12, 5, 20, 1, 18, 4 and 13 are written in the column of the "top" army. The numbers 6, 10, 15, 2, 17, 3, 19, 7, 16, 8 are written in the column of the "bottom" army.

The Play: Each player takes a turn trying to "kill" each "soldier" in the opponents "army". A soldier is killed by hitting the area of the board where he is located. Each time a soldier is killed, that number is crossed off the scoreboard. When all the soldiers in one army have been eliminated, that army has lost the game.

In order to make the game more difficult, you may designate valid areas that need to be hit. For example, only the thin outer "doubles" ring may be used. You can also handicap a weaker shooter this way: the stronger shooter has to hit the doubles ring while the weaker shooter only has to hit anywhere in the number.

By the way, if you shoot your own soldier, he dies. So be careful on the "border" areas.

Strategy: This game is not properly named. Warfare evolve a lot of strategy, however, this game does not.

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In 2010 Russ Strobel submitted to the Darts Australia a new recommended wheelchair dartboard set-up. The height Russ has come up with is 137cm to the centre Bull. The height was based on the perceived origins of the standard hanging height of the standard clock dartboard. It is said the average height of a man in the England UK was 5’8” around 1920’s, the height to the centre bulls-eye of a standard board. Modern adjustments make that 173cm. Russ has taken this analogy and worked out what the height would be should a man of 5’8” (173cm) be sitting in a wheelchair. His exact figure came out to be 136.5cm however as Russ explains the addition of 0.5cm would make the recommended wheelchair dartboard height easy to remember 137cm (wheelchair) - 173cm (Standard).

This new height for wheelchair users was recognized by the WDF on October 8th 2012. The fisrt World Disability Winmau' Masters took place in 2014.

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Many people either aim naturally and don’t think about it or don’t actively aim at all. Either way, you should pay attention to aiming. By truly concentrating on the board you can feel your focus being drawn into the diagonal lines. Then try to imagine your target area is bigger than it really is. Experiment with the following aiming options and make sure to practice. The key to consistent aiming is practicing until it becomes second nature.

Here are few things you should know about how to aiming your tungsten darts:

Find a sight line. Some people use a sight line on their throwing hand to help them aim. For example, you could use the first or second knuckle on the thumb of your throwing hand. Some people use the tip of the tungsten dart. Others use the small finger of the throwing hand to line up properly. The ultimate goal with a sight line is to line up your shot consistently.

Lead with your elbow. Just like some pitchers in baseball lead their pitch with the elbow, you can lead your tungsten dart throw with your elbow. You start by being aware of where your elbow is pointing. Make sure your elbow is pointing slightly up and directly at the dartboard. When you start your throw your elbow leads the process followed by the basic mechanics of your throw.

Aim directly at your target. Some people try to aim to the left or right of the real target. This is just lazy tungsten darts and can lead to technical and mental problems the longer you throw. If you are aiming at triple 20 and you miss to the left then aim directly in the middle of the triple 20 again. Don’t try to aim to the right to overcompensate for the last throw.

Know your dominant eye. Everyone has a dominate eye and it’s important to make sure you lead your aiming with that eye. If you don’t know which of your eyes is dominant take turns throwing three tungsten darts with each eye closed. Which ever eye you have to struggle to keep closed while you throw your tungsten darts is your dominate eye. Make sure you lead with this eye and you will naturally gain confidence as your throw.

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No matter what style of throw you use, always remember that it should be a consistent and comfortable throwing motion. The more consistent your mechanics the better you will throw. Experiment with different throwing motions to develop your style and then pick one style and practice until the motion becomes second nature. Your throw is one of the most important elements of the tungsten dart game. Take some time to analyze your throw and develop some good habits.

Advanced tungsten darts throwing techniques should incorporate the following:

Minimize movement. Only the shooting arm moves. Your shoulder should stay completely still, as should the rest of your body. You’ll make the game easier by keeping as still as possible while throwing. A steady and controlled back swing is critical to accuracy. Very few people can throw accurately without a back swing. And one smooth and fluid motion to the board is critical. Try to minimize any side-to-side motion.

Consistent release. This is very difficult to monitor, however a reliable release point for your tungsten dart throw is crucial to achieving consistency. Some players release the tungsten dart early in the throw, when the arm has just begun the forward motion. Others wait longer and release the tungsten dart at the very end of the throwing motion. Find out what is most comfortable for you and practice consistency with the release point.

Snapping the wrist. Not all players snap their wrist at the end of the throw because it is one more thing that can go wrong in the throw. However, it does help with acceleration in the last phase of your throw. A slower, controlled throw can increase accuracy and snapping your wrist like a whip can provide sufficient speed at the end of the throw.

Follow-through. A follow-through is critical. When a great basketball player takes a shot his hand follows through the motion of shooting the ball. Tungsten darts requires the same motion. At the end of your throw your fingers should be pointing at your target or down towards the floor. If you are pointing up to the sky then you probably aren't following through properly.

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