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Axis Carbon Stem
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 2012 Ritchey WCS 4-Axis Stem: Matrix Carbon; 110mm; 84d  US $129.15
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 Ritchey WCS 4-Axis Carbon Fiber Matrix Stem 84d 110mm 31.8mm 1 1/8" UD Degree US $99.45
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Ritchey 2012 WCS 4-Axis Road/Mountain Bike Stem Faceplate List Price: $0.00  |
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WCS 4Axis Matrix Faceplate |
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Ritchey WCS 4-Axis Carbon Matrix 3K Road/Mountain Bike Stem - 31.8 x +/- 6 Degree List Price: $0.00 |
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4-Axis technology combined with Matrix carbon.3D-Net forged 2014 alloy inner form combined with a carbon shell. 3 times the strength of pure alloy. Bias cut slot for carbon steerers 4-axis style clamp is carbon bar friendly. Titanium bolts. 40mm stack. 121g (110mm/31.8). |
Featured Article:
Alstroemerias are the native blossoms of South America which are admired for their beautiful and attractive umbels. Also being recognized as Inca Lily and Peruvian Lily, Alstroemeria has been named in honor of Claus alstroemer who introduced its seeds in South America in the 18th century.
Alstroemerias are the long-lasting, glitzy burgundy, cream, orange, pink, purple, red, white or yellow colored cut flowers belonging to the Amaryllidaceae family. Being partially zygomorphic or bilaterally symmetrical, these flowers comprise of 3 sepals and 3 petals, all being alike in color. Certain species may also grow as spotted or striped flowers. Alstroemerias are trumpet-shaped flowers which bear a likeness to the diminutive lilies and occur in small clusters at the top of long stem. It has six stamens with an inferior ovary consisting of 3 carpels. The placentas in the ovary are attached to the axis and it bears fruits in the form of capsule. There are around 50 diversified species of Alstroemeria being cultivated around the world. However, they are largely found in forests of Brazil and mountainous regions of Peru and Chile.
The blooming time for the perennials ranges from mid summer to late summer, however, they can be bought all year round. They have a long vase-life of about two weeks usually concluded with petal wilting and loss of rigidity. Alstroemerias are considered to be of good quality if they possess a symmetrical head forming a uniform cluster of flowers.
Growing Alstroemeria may require a certain amount of care. They should be kept away from ethylene sources and carbon monoxide. Watering should be done regularly, however water containing excessive fluoride shall be avoided as Alstroemeria are believed to be fluoride-sensitive plants. Solution containing flower food serves to be the best medium for Alstroemeria to grow. Moreover, if these flowers are required to be transported, the transfer should be done delicately as they have slender stems prone to be broken easily.
Alstroemeria plays a significant role in beautifying the garden corners and flower beds. Because of its color versatility, it appears appealing and attractive to the seers if placed in vases or containers. Even, a stamp being produced by Argentina bears the Alstroemeria illustration on it.
Alstroemeria flowers are no doubt, a symbol of perfect beauty.
Sarah Rahman is a student pursuing studies in the field of Mass Communication. She has a passion for writing and is currently working as a freelance writer rendering writing services to the national and International clients. You may get in touch on ali.sarah7@gmail.com or you may pay a visit to http://sarahrehman.blogspot.com
Facts Regarding Polystyrene Foam
What is EPS foam?
EPS is Expanded Polystyrene Foam. Polystyrene is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum by the chemical industry. At room temperature, polystyrene is normally a solid thermoplastic, but can be melted at higher temperature for molding or extrusion, then resolidified. Styrene is an aromatic monomer, and polystyrene is an aromatic polymer.
History of Polystyrene foam:
Polystyrene was accidentally discovered in 1839 by Eduard Simon; an apothecary in Berlin, Germany. From storax, the resin of Liquidambar orientalis, he distilled an oily substance, a monomer that he named styrol. Several days later Simon found that the styrol had thickened, presumably due to oxidation, into a jelly he dubbed styrol oxide ("Styroloxyd"). By 1845 English chemist John Blyth and German chemist August Wilhelm von Hofmann showed that the same transformation of styrol took place in the absence of oxygen. They called their substance metastyrol. Analysis later showed that it was chemically identical to Styroloxyd. In 1866 Marcelin Berthelot correctly identified the formation of metastyrol from styrol as a polymerization process. About 80 years went by before it was realized that heating of styrol starts a chain reaction, which produces macromolecules, following the thesis of German organic chemist Hermann Staudinger (1881 - 1965). This eventually led to the substance receiving its present name, polystyrene. The I.G. Farben Company began manufacturing polystyrene in Ludwigshafen, Germany, about 1931, hoping it would be a suitable replacement for die cast zinc in many applications. Success was achieved when they developed a reactor vessel that extruded polystyrene through a heated tube and cutter, producing polystyrene in pellet form.
Characteristics of Polystyrene:
Pure solid polystyrene is a colorless, hard plastic with limited flexibility. It can be cast into molds with fine detail. Polystyrene can be transparent or can be made to take on various colors. It is economical and is used for producing plastic model assembly kits, plastic cutlery, CD "jewel" cases, and many other objects where a fairly rigid, economical plastic of any of various colors is desired.
Polystyrene's most common use, however, is as expanded polystyrene (EPS). Expanded polystyrene is produced from a mixture of about 90-95% polystyrene and 5-10% gaseous blowing agent, most commonly pentane or carbon dioxide. Through the use of heat, usually stem, the solid plastic is expanded into foam.
Expanded polystyrene used to contain CFCs, but other, more environmentally safe blowing agents are now used. Because it is an aromatic hydrocarbon, it burns with an orange-yellow flame, giving off soot.
Cutting EPS foam:
Expanded polystyrene is very easily cut with a hot-wire foam cutter, which is easily made by a heated and taut length of wire, usually nichrome. The hot wire foam cutter works by heating the wire to the point where it can vaporize foam immediately adjacent to it. The foam gets vaporized before actually touching the heated wire, which yields exceptionally smooth cuts.
Polystyrene can also be cut with a traditional cutter. In order to do this without ruining the sides of the blade one must first dip the blade in water and cut with the blade at an angle of about 30º. The procedure has to be repeated multiple times for best results.
Polystyrene can also be cut on 3 and 5-axis CNC routers, enabling large-scale prototyping and model-making. Special polystyrene cutters are available that look more like large cylindrical rasps
Uses for Polystyrene:
Polystyrene, shaped and cut with hot wire foam cutters, is used in architecture models, actual signage, amusement parks, movie sets, airplane construction, aerospace and much more. Such cutters may cost just a few dollars (for a completely manual cutter) to tens of thousands of dollars for large CNC machines that can be used in high-volume industrial production.
About the Author
Tal is an electrical engineer with over 20 years of expertise with hardware, software, mechanical and motion control. Owner of Foamlinx, designing, manufacturing and distributing cnc hot wire foam cutters www.foamlinx.com and providing foam cutting services www.wecutfoam.com
Pure Nanotube-Type Growth Edges Toward the Possible
New research could ultimately show scientists the way to make batches of nanotubes of a single type.
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