Preform

	Preform Preform may refer to: * Preform, a piece of glass used to draw an optical fiber * Preform, a piece of polyethylene terephthalate test tube shaped form blown into a completed bottle * Preform, an incomplete and unused basic form of a stone tool in lithic reduction * Preform, a specially designed shape of solder * Preform, a high quality, precision metal stamping used for a variety of brazing and joining applications * PreForm, a a software package from 3D printing technology company Formlabs See also * Perform * Preformationism In the history of biology, preformationism (or preformism) is a formerly popular theory that organisms develop from miniature versions of themselves. Instead of assembly from parts, preformationists believed that the form of living things exist, ... , a theory that organisms develop from miniature versions of themselves {{disamb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Brazing Brazing is a metal-joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, with the filler metal having a lower melting point than the adjoining metal. Brazing differs from welding in that it does not involve melting the work pieces. Brazing differs from soldering through the use of a higher temperature and much more closely fitted parts than when soldering. During the brazing process, the filler metal flows into the gap between close-fitting parts by capillary action. The filler metal is brought slightly above its melting ( liquidus) temperature while protected by a suitable atmosphere, usually a flux. It then flows over the base metal (in a process known as wetting) and is then cooled to join the work pieces together. A major advantage of brazing is the ability to join the same or different metals with considerable strength. Basics High-quality brazed joints require that parts be closely fitted with base m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Optical Fiber An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables. Fibers are used instead of metal wires because signals travel along them with less loss; in addition, fibers are immune to electromagnetic interference, a problem from which metal wires suffer. Fibers are also used for illumination and imaging, and are often wrapped in bundles so they may be used to carry light into, or images out of confined spaces, as in the case of a fiberscope. Specially designed fibers are also used for a variety of other applications, some of them being fiber optic sensors and fiber lasers. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Polyethylene Terephthalate Polyethylene terephthalate (or poly(ethylene terephthalate), PET, PETE, or the obsolete PETP or PET-P), is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing, and in combination with glass fibre for engineering resins. In 2016, annual production of PET was 56 million tons. The biggest application is in fibres (in excess of 60%), with bottle production accounting for about 30% of global demand. In the context of textile applications, PET is referred to by its common name, polyester, whereas the acronym ''PET'' is generally used in relation to packaging. Polyester makes up about 18% of world polymer production and is the fourth-most-produced polymer after polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC). PET consists of repeating (C10H8O4) units. PET is commonly recycled, and has the digit 1 (♳) as its resin identification code (RIC). T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Lithic Reduction In archaeology, in particular of the Stone Age, lithic reduction is the process of fashioning stones or rocks from their natural state into tools or weapons by removing some parts. It has been intensely studied and many archaeological industries are identified almost entirely by the lithic analysis of the precise style of their tools and the chaîne opératoire of the reduction techniques they used. Normally the starting point is the selection of a piece of tool stone that has been detached by natural geological processes, and is an appropriate size and shape. In some cases solid rock or larger boulders may be quarried and broken into suitable smaller pieces, and in others the starting point may be a piece of the debitage, a flake removed from a previous operation to make a larger tool. The selected piece is called the lithic core (also known as the "objective piece"). A basic distinction is that between flaked or knapped stone, the main subject here, and ground stone object ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Solder Solder (; NA: ) is a fusible metal alloy used to create a permanent bond between metal workpieces. Solder is melted in order to wet the parts of the joint, where it adheres to and connects the pieces after cooling. Metals or alloys suitable for use as solder should have a lower melting point than the pieces to be joined. The solder should also be resistant to oxidative and corrosive effects that would degrade the joint over time. Solder used in making electrical connections also needs to have favorable electrical characteristics. Soft solder typically has a melting point range of , and is commonly used in electronics, plumbing, and sheet metal work. Alloys that melt between are the most commonly used. Soldering performed using alloys with a melting point above is called "hard soldering", "silver soldering", or brazing. In specific proportions, some alloys are eutectic — that is, the alloy's melting point is the lowest possible for a mixture of those components, and co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Formlabs Formlabs is a 3D printing technology developer and manufacturer. The Somerville, Massachusetts-based company was founded in September 2011 by three MIT Media Lab students. The company develops and manufactures 3D printers and related software and consumables. It is most known for raising nearly $3 million in a Kickstarter campaign and creating the Form 1, Form 1+, Form 2, Form Cell, Form 3, Form 3L, and Fuse 1 stereolithography and selective laser sintering 3D printers. History Formlabs was founded by Maxim Lobovsky, Natan Linder, and David Cranor, who met as students at the MIT Media Lab while taking a class called "How to Make (almost) Anything". The founders also drew on their experience with MIT's Center for Bits and Atoms Fab Lab program, as well as Lobovsky's experience with the Fab@Home project at Cornell University. Formlabs was officially founded in September 2011 to develop the first desktop-sized, easy-to-use, and affordable stereolithography 3D printer. Formlabs rec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Perform PerForm and PerForm PRO were electronic form programs, initially designed to work under GEM in DOS. Later versions were designed to work in Windows 3.1, at which point it was succeeded by FormFlow. The initial version of PerForm was created in 1988 and was the first product released by Canadian software firm Delrina, which became best known for its later fax software program, WinFax. Chief Technical Officer Bert Amato and President of the company Mark Skapinker came up with the idea for the product while working as consultants that what their clients wanted was a way to fill in forms electronically, rather than an easier way to create paper-based forms from a computer. The program consisted of two parts: a form design module which gave users a graphical user interface for creating and arranging form elements, using tools largely familiar to those using desktop publishing or paint programs of the era, and a separate form filling program which would display the resulting form that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]