what are ldrs made of?
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As its name implies, the Light Dependent Resistor (LDR) is made from a piece of exposed semiconductor material such as cadmium sulphide that changes its electrical resistance from several thousand Ohms in the dark to only a few hundred Ohms when light falls upon it by creating hole-electron pairs in the material.
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Bags are often made of high density polyethylene (HDPE). This plastic is usually milky white or semi-translucent, has superior puncture, low permeability and temperature resistance, and is more rigid and stronger than LDPE / LLDPE but also tears easier and has a propensity to crinkle.
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The lander beams are made out of carbon-based layers of graphite fiber woven into a fabric, creating a material that is lighter than aluminum and more rigid than steel. Titanium fittings are bonded (glued and fitted) onto the lander beams to allow it to be bolted together.
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Plastic. Historically, straws have been made from paper but today polypropylene plastic is the material of choice. Polypropylene is a resin made by polymerizing, or stringing together, molecules of a propylene gas.
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Number 4 - LDPE - Low-density Polyethylene: Wrapping films, grocery bags, and sandwich bags. Note that most cities accept plastics #4 for recycling, but NOT grocery bags (these can stuck in the sorting machines).
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Glulam to LVL Comparison LVL refers to a manufactured timber product made from thin veneers (often 3mm) glued together to form large structural members, often known as Hyspan or similiar. Glulam is made from thicker sections of timber, generally 15-45mm thick, glued together to form a large variety of products.
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manufactured by gluing strands of wood together under pressure. The strands are then structurally bonded together in a patented microwave process to form large cross-section beams and columns. Parallam® PSL beams are beautiful and strong, adding integrity to structures as a result of their superior strength.
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['Metal (steel or aluminum) fuel tanks welded from stamped sheets. ... ', 'Plastic high-density polyethylene (HDPE) fuel tanks made by blow molding.']
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Seat frames and the heart of the steering wheel are made of magnesium, a lightweight metal. The body is made of an impact-resistant composite plastic that is recyclable. Electric car batteries consist of plastic housings that contains metal anodes and cathodes and fluid called electrolyte.
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Kevlar is made by a condensation reaction of an amine (1,4-phenylene-diamine) and and acid chloride (terephthaloyl chloride). The kevlar chains are relatively rigid and tend to form mostly planar sheets, similar to those of silk.
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LDPE is low density polyethylene. It is a thermoplastic which is made from ethylene. ... HDPE is high density polyethylene which is prepared by co-ordination polymerization, which occurs through the formation of intermediate complexes, of ethene. Here, ethene is heated to 333-343 K under a pressure of 6-7 atmospheres.
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A long-distance relationship (LDR) or long-distance romantic relationship (LDRR) is an intimate relationship between partners who are geographically separated from one another. Partners in LDRs face geographic separation and lack of face-to-face contact.
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Kevlar is made by a condensation reaction of an amine (1,4-phenylene-diamine) and and acid chloride (terephthaloyl chloride). The kevlar chains are relatively rigid and tend to form mostly planar sheets, similar to those of silk. This is due to the para-orientation of the benzene rings.
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Introduction. For the past few weeks I've had the opportunity to compare a number of Baader Hyperion eyepieces with their equivalents from the Vixen LVW range. The Hyperions are made in China whereas the LVWs are of Japanese manufacture and retail for roughly twice as much as the Hyperions.
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The rings are made of plastic #4 (LDPE) and can be recycled in programs that accept low-density polyethylene resin. ... The company has worked with more than 12,000 schools and groups to collected and recycle the used rings. A little known fact: Six-pack plastic beverage rings are actually photodegradable.
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The various parts of the defibrillator, including the control box casing, microelectronics, and the electrodes, are all made with biocompatible materials. Typically, the casing is made of a hard polystyrene plastic or lightweight metal alloy. The electrodes are made from titanium and silicone rubber.
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The JUUL aluminum shell encases a lithium-ion battery, a circuit board and a pressure sensor, all separate from the vapor path and liquid. JUULpods are made with heat resistant, food-grade plastics, and contain a stainless steel vapor path, an industry standard silica wick, and nichrome coil heater.