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Tennis Racquet Replacement
Checkout Ebay Auctions For The Cheapest Prices
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US $4.93
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Bolle 2011/12 Chase RL - Replacement Lenses (Pair) List Price: $0.00  |
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Ideal for all-purpose use. |
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Tennis Racket Mailbox Flag Replacement Sale Price: $18.95 |
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This heavy duty designer Mailbox Flag with a Tennis Racket design will replace the existing standard flag on your mailbox. The item comes in a shrink wrapped package and the mounting bracket and hardware is included... |
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Bolle Replacement Nose Pads List Price: $12.00 Sale Price: $13.95 |
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These replacement nose pads, specifically designed for the Vigilante and Parole frames, attach to the frame quite easily with glue. (Glue not included.) There are 2 nose pads per pack. Color: Black |
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Bolle 2011/12 Parole 2 RL - Replacement Lenses (Pair) List Price: $0.00 |
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Ideal for all-purpose use. |
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Bolle 2011/12 Helix RL - Replacement Lenses (Pair) List Price: $0.00 |
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Ideal for all-purpose use. |
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Wilson Micro-Dry Comfort Replacement Grip (Black) List Price: $9.99 Sale Price: $4.90 |
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Improve your performance on the tennis court with the Wilson [K] Cushion Air Contour grip. Designed for comfort and security, the grip features patented vertical pores on the surface for moisture absorption, along with raised contours that feel comfortable in the hand... |
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Butterfly TR21 Personal Rollaway Table Tennis Table (Green) List Price: $474.99 Sale Price: $474.99 |
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A great value for your home's rec room or for clubs and schools, the Butterfly TR21 Personal Rollaway Table Tennis Table provides the highest level of performance in this price-range. This table features a 3/4-inch wood table top, 1-1/2-inch steel railing rim, and 1-inch steel legs... |
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Gamma Pro Rx Replacement Grip, Black/Black Perforations List Price: $4.99 Sale Price: $4.25 |
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The Gamma Pro Rx Replacement Tennis Grip is tacky and cushioned with comfort foam backing that acts as an antifatigue shock absorbing barrier betwwen your hand and the racquet.Colors: Black/Black |
Featured Article:
Have I written that title correctly? The Pros And Cons Of The Nintendo Wii? Am I insane? Whoever thought of such a subject to write about?
Ok, well lets be frank, has anyone checked out the Nintendo Wii for possible flaws or imperfections? Or do we all accept its total perfection and flawlessness?
Alright, I admit that I'm being just a tad flippant there, but hey, come on, lets check it out for ourselves just to see how well the ol' Wii stands up to a hint of amateur inspection.
Well, firstly we can, I think pretty safely say that the Wii is cheaper than its counterparts such as the ps3 and the Xbox 360, it has a nice, sleek design, a controller which is motion sensitive and of course it has virtual control! Thats a good start isn't it? I mean, those are all quite positive factors aren't they.
In addition, let's not forget the amazing physical benefit of playing tennis, for example, on the Wii and actually swinging your racket as if you were doing the real thing - thats pure excercise is it not???
We must not forget one thing - when you buy the Nintendo Wii - you are getting the console itself plus the 5 games, so you can start the fun literally as soon as you press the ON button, so to speak.
Any cons though? Actually - yes. Some people don't realise until after purchase that you can only use the Wii via Wi-Fi - ie, you cannot use a normal cable, or ethernet cable (at least not at the time of writing).
Some would argue in addition that the graphic quality is not up to scratch to that of other consoles. In fact, if you read various write-ups on the Wii, this is the one that comes up every time - lower graphic quality than other top-of-the-range consoles.
Possibly a minor point for most, but just to mention it - the internal storage of the Wii is significantly low with a 512 flash memory which is nowhere near the huge storage capacity of the ps3 or the xbox 360.
However, if the cons are not a problem to you, (and to be frank they are not major flaws in honesty), the Nintendo Wii comes up trumps in my opinion.
Actually, we don't have to rely on my opinion - just look at how well the Wii is doing. At the time of writing, the Nintendo Wii is the top console seller on and off line and if that be the case then the pros of the Wii certainly outweigh its cons by a Wii bit more than we might have originally thought.
John Milligan.
[http://www.computer-games-store.co.uk]
An excellent resource for all those consoles and games you've ever wanted. No searching all over the web for different bargains. They're all here, Ebay, Amazon, Argos and lots of other top sellers.
So, if you're hungry for that bargain console or game or even that ipod nano 8gb, then go to the website, have a good browse and enjoy your shopping experience.
What Is Bulk Metallic Glass?
Bulk metallic glass, a.k.a. amorphous metal, appears to have a very bright future. Being twice as strong as titanium, tougher and more elastic than ceramics, and having excellent wear and corrosion resistance makes them attractive for a variety of applications. It can even be cast in a mold to near net shapes.
Conventional Metals
In an ordinary metal the atoms of the metal arrange themselves into a repeating pattern of crystals or grains with different sizes and shapes upon cooling from the liquid state. Because metals typically do not solidify into single crystals, they have inherent weaknesses.
The boundaries between the grains are weak spots and under high enough stress and temperature the grains will slide past each other resulting in metal deformation. In addition, extra atoms are often present in grains causing planes of distortion called dislocations. Dislocations easily move through metal that is under stress, again causing deformation. Grain boundaries and dislocations greatly lower a metals strength compared to its theoretical maximum.
Casting of conventional metals also requires more manufacturing steps than bulk metallic glass. Conventional metals shrink significantly as they cool in the mold from liquid to solid form and often develop surface roughness. Secondary steps are usually required to get at the final product, such as grinding and polishing.
Bulk Metallic Glass
The structure of metallic glass is very different from that of conventional metals. Rather than arranging themselves into repeating patterns of grains, the atoms of metallic glasses are "frozen" in a random, disordered structure, similar to regular window glass. It even has a smooth surface like glass. So smooth, in fact, that paint does not adhere well to metallic glass. It is this amorphous structure, lacking in grain defects, that gives metallic glasses their strength, toughness, hardness, elasticity and corrosion and wear resistance.
First discovered by Pol Duwez in 1960 at Caltech, the technique to create metallic glasses required undercooling a molten metal uniformly and rapidly. Rapidly as in 1,000,000°C per second! The molten metal reaches its glass transition temperature without enough time or energy to crystallize, and instead solidifies as metallic glass. Because the material did not conduct heat well, only thin ribbons of metallic glass could be created because of the uniformity and speed of cooling that was required.
Around 1990 Akihisa Inoue and his team at Tohoku University in Japan discovered new alloys that could form thicker metallic glasses at cooling rates as low at 1°C to 100°C, as long as three conditions were met:
1) Use three or more elements in the alloy
2) The atomic size of the elements must differ from each other by at least 12 percent
3) Use elements that have a strong affinity for each other
Soon after, William Johnson and Atakan Peker at Caltech did the same. The lower cooling rates allowed for thicker materials to be created, up to four inches. These thicker materials are referred to as bulk metallic glass (BMG).
Currently available bulk metallic glasses are malleable at around 400°C, compared to over 1000°C for steel. This allows the material to be processed similarly to polymers, with high volume production via casting up to a thickness of four inches. The material has low shrinkage during solidification and can therefore be cast in near-net shapes with microscale precision. The smooth shiny surface eliminates secondary finishing processes. Scalpels made from bulk metallic glass come out of the mold sharp and ready to use.
Some Disadvantages
As with any material, BMG cannot be everything to every application. Its plastic like manufacturability also means that it cannot be used in high temperature applications, i.e., above 260°C, because it becomes soft and weakened. Pure bulk metallic glasses also exhibit cyclic fatigue from repeated stress. Because of their high elasticity and low plasticity, catastrophic failure occurs after only a small amount of plastic deformation.
BMG Composites
New developments in BMG composites are helping to reduce the limitations of the material. In a BMG composite the BMG is the matrix and a ductile crystalline-phase is the reinforcement material. The reinforcement can either be an added material, such as metal or ceramic fibers, or internally created by precipitating ductile dendrites within the BMG, yielding partial crystallinity. These composites combine the ductility, fracture toughness and plasticity of conventional metals with the high strength of pure BMG.
Applications
BMGs are being examined for or currently used in a wide variety of applications including:
– Industrial coatings for improved wear and corrosion resistance – As a replacement for depleted uranium in Kinetic Energy Penetrators for the military. – Casings for cell phones – Scalpels – Sporting goods such as bats and tennis racquets – Jewelry
The Defense Advanced Research Projects Agency (DARPA) also funding a three-year program called Structural Amorphous Metals (SAM). The aim of the program is to demonstrate the viability of BMG in structural applications. Specific applications being investigated include "corrosion-resistant, reduced magnetic mass hull materials; moderate temperature, lightweight alloys for aircraft and rocket propulsion; and wear-resistant machinery components for ground, marine, and air vehicles."
U.S. Patent Situation
Upon examining several patents and class codes on amorphous metals it appears that the main U.S. patent classification codes for these materials are:
148/304 – Amorphous: Stock material which has no regular crystal structure but rather has a series of noncrystalline areas much like a glass.
148/403 – Amorphous, i.e., glassy: Stock material which has no regular crystal structure, but rather has a series of noncrystalline areas much like a glass.
148/561 – Passing through an amorphous state or treating or producing an amorphous metal or alloy: Process wherein a metal or metal alloy having no regular crystalline structure or periodicity (i.e., amorphous) in any amount is produced or treated by a process under the class definition or wherein a metal or metal alloy passes through a physical state having no regular crystalline structure or periodicity during the treatment of the metal or metal alloy.
Guideline examined patents assigned to these codes that were granted during the period from 1987 to 2003. We then compared the top patent holders for the above class codes in terms of number of patents published from 1987 to 2003.
Top BMG Patent Holders from '87 to '03
55 patents – YKK Corp.
43 patents – Honeywell
33 patents – Tsuyoshi Masumoto & Unitika Ltd.
26 patents – Akihisa Inoue
15 patents – Alps Electric Co.
14 patents – Koji Hashimoto
13 patents – California Institute of Technology
13 patents – Nippon Steel Corp.
11 patents – Hitachi Ltd.
11 patents – Kabushiki Kaisha Toshiba
One method Guideline uses to compare patent holders is by calculating an index referred to as Technology Influence. Technology Influence represents how often an assignee's patents from the previous five years (in this case, 1998-2002) are referenced by patents published in the year of comparison (in this case 2003). A Technology Influence value of 1 represents the average. This shows how much a patent holder's past technology developments are influencing current development. From this analysis Guideline determined that Caltech's work has been most influential as their Technology Influence value is 5.06, whereas the next closest value is only 1.46, held by Alps Electric.
Applied Science is another calculation used to compare patent holders. This refers to the average number of non-patent references cited by a patent holder's patents, such as scientific papers from journals, conference proceedings, etc. This gives an indication of which companies are working on the leading edge. Again, Caltech stands out as a clear leader with an Applied Science value of 7.3. This makes sense considering that Caltech is known to be one of the leaders in developing this technology. As mentioned earlier, metallic glass was first discovered at Caltech.
An analysis of patent assignees and inventors revealed that Akihisa Inoue has done extensive work and collaboration. He is listed as an inventor or co-inventor on a little over 60 patents with about 120 other Japanese researchers. All of this work was done with the following Japanese organizations, and this is only in regards to U.S. patents.
– Tsuyoshi Masumoto and Unitika, Limited – Teikoku Piston Ring Company Limited – Alps Electric Co., Ltd. – YKK Corporation – Honda Motor Co., Ltd. – Yamaha Corporation – Japan Science and Technology Corporation – Unitika Ltd. – Toyota Jidosha Kabushiki Kaisha – Research Development Corporation of Japan – Japan Metals & Chemicals Co., Ltd. – Sumitomo Rubber Industries, Ltd. – Mitsubishi Materials Corporation
Indeed, Inoue led a five year project sponsored by the Japanese government (Inoue Supercooled Liquid Glass Project), which reported the development of a less expensive copper alloy based BMG with a tensile strength over 2 Gpa. Currently Inoue is leading a five-year project sponsored by the Japanese New Energy and Industrial Technology Development Organization.
Although Inoue has done the most extensive work in terms of U.S. patenting on amorphous and glassy metal technology, the work being done by William Johnson's group at Caltech appears to be having a larger impact on the overall body of work in U.S. patents over recent years.
About the Author
Brian Reuter is Director of Product Realization at Guideline, Inc. Guideline provides research,
product realization
,
expert witness and consulting
services. Learn more at
www.intota.com
.
Which Tennis Racquet is better? NSix-One or AeroPro Drive?
I need a new main racquet, my Pure Drive is broken and I need to find a replacement. Which one do you think is better and why?
AeroPro Drive, it provides better spin, while the NSix-One provides both power and control but at the requirement of being very consistent. It requires too much consistency that it becomes too much of a hastle. I can really see why Federer keeps missing routine forehands with this racquet.
A leg up on life
From a distance, Andrea Heap of Ridgefield looked like one of a ladies double, though taller than the others and I approached as she was preparing to serve.
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