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Grivory
POLYPHTHALAMIDE (aka. PPA, HIGH PERFORMANCE POLYAMIDE) is a subset of thermoplastic synthetic resins in the polyamide (nylon ) family defined as when 55% or more moles of the carboxylic acid portion of the repeating unit in the polymer chain is composed of a combination of terephthalic (TPA) and isophthalic (IPA) acids. The substitution of aliphatic diacids by aromatic diacids in the polymer backbone increases the melting point, glass transition temperature, chemical resistance and stiffness. PPA based resins are molded into parts to replace metals in applications requiring high temperature resistance such as automotive powertrain components, the housing for high temperature electrical connectors and many other uses
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USB Type-C
USB
USB
TYPE-C, commonly known as simply USB-C, is a 24-pin USB
USB
connector system allowing transport of data and power. It is distinguished by its horizontally symmetrical "reversible" connector. The USB
USB
Type-C Specification 1.0 was published by the USB Implementers Forum (USB-IF) and was finalized in August 2014. It was developed at roughly the same time as the USB
USB
3.1 specification. A device that implements USB-C does not necessarily implement USB
USB
3.1 , USB
USB
Power Delivery , or Alternate Mode
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Catheters
In medicine , a CATHETER is a thin tube made from medical grade materials serving a broad range of functions. Catheters are medical devices that can be inserted in the body to treat diseases or perform a surgical procedure. By modifying the material or adjusting the way catheters are manufactured, it is possible to tailor catheters for cardiovascular, urological, gastrointestinal, neurovascular, and ophthalmic applications. Catheters can be inserted into a body cavity, duct, or vessel. Functionally, they allow drainage, administration of fluids or gases, access by surgical instruments, and also perform a wide variety of other tasks depending on the type of catheter. The process of inserting a catheter is CATHETERIZATION. In most uses, a catheter is a thin, flexible tube ("soft" catheter) though catheters are available in varying levels of stiffness depending on the application
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International Standard Book Number
The INTERNATIONAL STANDARD BOOK NUMBER (ISBN) is a unique numeric commercial book identifier. An ISBN is assigned to each edition and variation (except reprintings) of a book. For example, an e-book , a paperback and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, and 10 digits long if assigned before 2007. The method of assigning an ISBN is nation-based and varies from country to country, often depending on how large the publishing industry is within a country. The initial ISBN configuration of recognition was generated in 1967 based upon the 9-digit STANDARD BOOK NUMBERING (SBN) created in 1966. The 10-digit ISBN format was developed by the International Organization for Standardization (ISO) and was published in 1970 as international standard ISO 2108 (the SBN code can be converted to a ten digit ISBN by prefixing it with a zero)
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Special
SPECIAL or SPECIALS may refer to: CONTENTS * 1 Music * 2 Film and television * 3 Other uses * 4 See also MUSIC * Special (album) , a 1992 album by Vesta Williams * "Special" (Garbage song) , 1998 * "Special" (Mew song) , 2005 * "Special" (Stephen Lynch song) , 2000 * The Specials
The Specials
, a British band * "Special", a song by Violent Femmes on The Blind Leading the Naked * "Special", a song on
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Soldering
SOLDERING (AmE : /ˈsɒdərɪŋ/ , BrE : /ˈsɒldərɪŋ/ ), is a process in which two or more items (usually metal) are joined together by melting and putting a filler metal (solder ) into the joint, the filler metal having a lower melting point than the adjoining metal. Soldering
Soldering
differs from welding in that soldering does not involve melting the work pieces. In brazing , the filler metal melts at a higher temperature, but the work piece metal does not melt. In the past, nearly all solders contained lead , but environmental and health concerns have increasingly dictated use of lead-free alloys for electronics and plumbing purposes
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Surface Mount Devices
SURFACE-MOUNT TECHNOLOGY (SMT) is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards (PCBs). An electronic device so made is called a SURFACE-MOUNT DEVICE (SMD). In the industry it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board. Both technologies can be used on the same board, with the through-hole technology used for components not suitable for surface mounting such as large transformers and heat-sinked power semiconductors. By employing SMT, the production process speeds up, but the risk of defects also increase due to the components miniaturization and denser packing of boards. In those conditions, the failures detection have become critical for any SMT manufacturing process
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Synthetic Resin
SYNTHETIC RESINS are materials with properties similar to natural plant resins . They are viscous liquids capable of hardening permanently. Chemically they are very different from resinous compounds secreted by plants (see resin for discussion of the natural products). Synthetic resins are of several classes. Some are manufactured by esterification or soaping of organic compounds . Some are thermosetting plastics in which the term "resin" is loosely applied to the reactant or product, or both. "Resin" may be applied to one of two monomers in a copolymer , the other being called a "hardener", as in epoxy resins . For thermosetting plastics that require only one monomer, the monomer compound is the "resin". For example, liquid methyl methacrylate is often called the "resin" or "casting resin" while in the liquid state, before it polymerizes and "sets". After setting, the resulting PMMA is often renamed acrylic glass , or "acrylic"
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Polyamide
A POLYAMIDE is a macromolecule with repeating units linked by amide bonds. Polyamides occur both naturally and artificially. Examples of naturally occurring polyamides are proteins , such as wool and silk . Artificially made polyamides can be made through step-growth polymerization or solid-phase synthesis yielding materials such as nylons , aramids , and sodium poly(aspartate) . Synthetic polyamides are commonly used in textiles, automotive applications, carpets and sportswear due to their high durability and strength. The transportation manufacturing industry is the major consumer, accounting for 35% of polyamide (PA) consumption. CONTENTS * 1 Classification * 2 Polymerization chemistry * 3 See also * 4 References * 5 Further reading CLASSIFICATIONPolymers of amino acids are known as polypeptides or proteins
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Nylon
NYLON is a generic designation for a family of synthetic polymers , based on aliphatic or semi-aromatic polyamides . Nylon
Nylon
is a thermoplastic silky material that can be melt-processed into fibers, films or shapes. :2 Nylon
Nylon
was the first commercially successful synthetic thermoplastic polymer. DuPont
DuPont
began its research project in 1930. The first example of nylon (nylon 6,6 ) was produced using diamines on February 28, 1935, by Wallace Carothers at DuPont's research facility at the DuPont Experimental Station . In response to Carothers' work, Paul Schlack at IG Farben developed nylon 6 , a different formulation based on caprolactam , on January 29, 1938
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Thermoplastic
A THERMOPLASTIC, or THERMOSOFTENING PLASTIC, is a plastic material, a polymer , that becomes pliable or moldable above a specific temperature and solidifies upon cooling. Most thermoplastics have a high molecular weight . The polymer chains associate through intermolecular forces , which weaken rapidly with increased temperature, yielding a viscous liquid. Thus, thermoplastics may be reshaped by heating and are typically used to produce parts by various polymer processing techniques such as injection molding, compression molding, calendering , and extrusion. Thermoplastics differ from thermosetting polymers , which form irreversible chemical bonds during the curing process. Thermosets do not melt when heated: they decompose and do not reform upon cooling. Stress-strain graph of a thermoplastic material Above its glass transition temperature and below its melting point , the physical properties of a thermoplastic change drastically without an associated phase change
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Led
A LIGHT-EMITTING DIODE (LED) is a two-lead semiconductor light source . It is a p–n junction diode that emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons . This effect is called electroluminescence , and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. LEDs are typically small (less than 1 mm2) and integrated optical components may be used to shape the radiation pattern . Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared light. Infrared
Infrared
LEDs are still frequently used as transmitting elements in remote-control circuits, such as those in remote controls for a wide variety of consumer electronics
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Polyphthalamide
POLYPHTHALAMIDE (aka. PPA, HIGH PERFORMANCE POLYAMIDE) is a subset of thermoplastic synthetic resins in the polyamide (nylon ) family defined as when 55% or more moles of the carboxylic acid portion of the repeating unit in the polymer chain is composed of a combination of terephthalic (TPA) and isophthalic (IPA) acids. The substitution of aliphatic diacids by aromatic diacids in the polymer backbone increases the melting point, glass transition temperature, chemical resistance and stiffness. PPA based resins are molded into parts to replace metals in applications requiring high temperature resistance such as automotive powertrain components, the housing for high temperature electrical connectors and many other uses
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