Killers: Killers is a really fun game designed to be played with 3 or more people. The more people playing the more fun it is. It is a great game to play when there are an odd number of people and everyone wants to play tungsten darts.

The Object: To win killers you must simply be the last person on the scoreboard with a life left.

The Scoring: The names are place down the left side of the score board in any order. Generally, after the first game is played, the player who was knocked out first gets to throw first in the next game. For the first game, people usually do a closest to the bullseye with one dart each. Next to each name, three tally marks are placed to indicate the number of lives each player has left.

The Play: Play begins with each player, in order, throwing one tungsten dart left-handed (or right-handed if that player is a lefty). This is to set a random number and that number will be the players number for the rest of the game. Whatever number is hit is written next to that players name. No two players may have the same number, so if a player hits a number that was already taken that player should throw again.

The next step in the game is to become a "killer". You become a killer by hitting the double (the thin outer ring) of your number once. When you hit a double of your number, write a "K" next to your name to show that you are a killer. Note: if you hit a double with your left-handed throw, you automatically become a killer, provided no one else already had that number.

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A tungsten linear accelerator is a highly specialized machine in which a high frequency (alternating) electric field is used to accelerate electrons, producing high energy X-rays (photons) and electrons.

In operation, an electron gun with a tungsten filament produces electrons, which rides on microwaves down an accelerating waveguide at nearly the speed of light (186,000 miles per second). A powerful bending magnet is used to select the appropriate electron energy (measured in millions of electron volts (MeV)) and send these electrons to impact on a thin tungsten target producing photons (deeply penetrating X-rays). With a flip of a switch, the electrons may bypass the tungsten target and hit a scattering foil to generate a beam of electrons used for non-penetrating or superficial treatments, such as in the treatment of skin cancer. On the way to the patient, the chosen type of radiation beam is made flat and symmetric by using a flattening filter with quadrant monitor chambers. The dose is monitored using ionization chambers, and the beam is constrained and shaped using the 120 tungsten leaf multi-leaf collimator, to cover only the projected target area. These beam modifications correlate with the therapy plan, which produced by treatment planning computer to give the proper sculpted radiation dose to the tumor.

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
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tungsten polymer is composed of tungsten powder and one of a number of standard plastic base resins, which are selected according to the application. These base resin systems include polysulfones (PSU), co-polyamides, polyamides (PA), polymethylpentenes (PMP), polyurethanes (TPU), acryloynitrile butadiene styrene (ABS), polyethylenes (PE) and polyetheretherketones (PEEK). It has a high molecular polymer composited material having a density up to 11 g/cc (equivalent to lead). It is composed of the following components by weight ratio: a high molecular polymer 20-100, tungsten powder 950-1000, tungsten fiber 0-50, a coupling agent 0.5-5 and other aids 0.5-10.

Tungsten polymer has been found many applications in industries, including:

• X-ray devices in manufacturing industries and medical x-ray machines;
• Nuclear and medical industries, it is used as radiation shielding;
• Radiation shielding and radiation-protective equipment;
• Gamma ray shielding material and substitute for lead fiber mat in nuclear reactor piping systems;
• It is also used in weight and balance applications as a counterweight for applications like motors, ballasts and more;
• Used as a sound proofing material in aviation headphones;
• Acts as a damper to reduce shock due to vibration in the automotive industry.

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
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Defect types of tungsten contacts described as follows:

1. Porous holes, pores
This defect type is common in powder metallurgy to prepare tungsten contacts. This may be because:
Uneven particle size of tungsten powder;
The gas content of tungsten powder is relatively large;
Insufficient pressure when mixing powder;
Insufficient infiltration, when you are sintering the porous tungsten skeleton.

2. Unevenly distributed organization
Reason: Because of the existence of added element, it makes the added element or poor oxide in grain boundaries aggregated.

3. Inclusions
Under normal circumstances, the presence of inclusions in the tungsten contacts may be due to: non-metallic inclusions mixed in them and other foreign metal inclusions mixed with.

4. Bubbles
Because there are small holes in tungsten ingot itself, and the phenomenon of inner oxide will appear when pressing, crushed holes will expand to form bubbles.

5. Delaminating cracks
Because tungsten ingot itself has already gathered micro cracks, during the oxidation process, because stress makes delaminating of the cracks.

 

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2007 saw the Professional Darts Corporation (also known as PDC) introduce the ground-breaking Grand Slam of Darts competition, which features 32 players who have reached the finals of major PDC and BDO tournaments competing in Wolverhampton.

The PDC also introduced the innovative internet-streamed Championship League Darts in 2008, while the PDC World Cup - a Pairs tournament featuring 24 countries - season-ending Players Championship Finals and The Masters events have also been added to the circuit of major televised events.

The PDC continues to go from strength to strength with its central aim to ensure the sport receives the recognition and respect professional darts deserves, with both the Qualifying School - where players can win Tour Cards to compete on the PDC circuit full-time - and the introduction of the PDC Unicorn Development Tour and World Youth Championship guaranteeing a pathway to the top for aspiring stars.

The PDC also work with affiliated organizations for a number of region circuits worldwide, notably the DPA in Australia, SDC in Scandinavia, and in North America, where each region stages a series of ranking events each year which produces qualifiers for the World Championship.

The expansion of the PDC across Europe led to the introduction in 2012 of the European Tour series of events, which has expanded to nine tournaments in 2015 being held in the UK, Germany, Austria, Gibraltar and the Netherlands which give leading professionals and emerging talents from across the Continent the chance to compete at the top level.

2013 saw the introduction of the World Series of Darts, which began with the Dubai Duty Free Darts Masters and Sydney Darts Masters and see the world's top eight players spreading the professional game worldwide, with events in 2015 being also staged in Yokohama, Perth and Auckland.
As for professional game of dart, we recommend tungsten dart, tungsten is an extremely dense metal. It is also very durable, so a high-density tungsten dart resists wear and the knurling will last much longer.

  Tungsten Dart Manufacturer & Supplier: Chinatungsten Online - http://www.chinadart.com/
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The Professional Darts Corporation (also known as PDC) was initially formed as the World Darts Council in January 1992, and is now the leading professional body in the sport with over £7 million in prize money being paid out on its global circuit of tournaments.

The WDC was formed after 16 top professional players, along with managers Dick Allix, Tommy Cox and John Markovic, decided to break away from the British Darts Organisation to take the sport to a new level.

The first WDC event, the UK Masters, took place in October 1992 and the first World Championship was played over the 1993-94 festive period, establishing the partnership with Sky Sports which remains to this day.

The World Matchplay event followed in the summer of 1994, and four years later the World Grand Prix was introduced to the calendar to give three major televised events.

In July 2001, the Board of Directors who had carried the PDC forward since its inception decided to step down in favour of a specialist team, headed by promoter Barry Hearn, who came in as Chairman.

The PDC has built up a reputation as the leading innovator in terms of staging professional darts tournaments and as such is constantly looking towards the future and improving the organisation in every area.

Five ranking tournaments are staged live on Sky Sports each year, broadcasting to a global audience of more than 300 million viewers, and 2005 saw the introduction of the Premier League Darts to great success.

The tournament has grown to become the UK & Ireland's biggest indoor sporting event, being played across 15 league nights around the country, before the top four players then take part in the Play-Offs, and has expanded to be staged in arenas in front of crowds of up to 10,000 fans across a four-month period.

The PDC's commitment to spreading professional tungsten darts worldwide led to the Las Vegas Desert Classic being introduced to the calendar in 2002 and the arrival of the UK Open in 2003, which included a series of qualifying tournaments for professional players which now form part of the PDC Pro Tour.

The first professional tournament in China was staged in 2004, and the worldwide development has continued with the inclusion of more international qualifiers taking part in the PDC World Championship - with countries such as Japan, Spain, South Africa, New Zealand and Australia represented.

As for professional game of dart, we recommend tungsten dart, tungsten is an extremely dense metal. It is also very durable, so a high-density tungsten dart resists wear and the knurling will last much longer.

  Tungsten Dart Manufacturer & Supplier: Chinatungsten Online - http://www.chinadart.com/
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Ammonium paratungstate preparing submicron spherical tungsten powder process: Violet tungsten oxide is prepared with pure ammonium paratungstate in argon gas. Tungsten powder is obtained from violet tungsten oxide through deoxidation in hydrogen gas (rate of purity:99.99%, dew point: -40℃), and tungsten powder is oxidized in the air. Tungsten oxide is reduced to tungsten powder in hydrogen gas. The samples are characterized with the laser particle size distribution measuring instrument and the electron probe scan instrument.

The results show that submicron tungsten powder can be obtained through circulatory oxidation twice and reduction three times. The percentage of the particle size distribution of submicron spherical tungsten powder is 95.73% between 0.1um and 1.0um, and its BET is 1.082 m2/g.




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