Yahoo奇摩 網頁搜尋

登入

  1. 輕鋼架節能循環扇價格 相關

    廣告
  2. events.carrefour.com.tw/家樂福/節能涼爽超省價

    家樂福線上購物│節能省錢全攻略 - 買指定變頻冷氣滿$5,000折$500！ - 再抽KIA EV6電動車+減碳節能金！

    過去一個月已有 超過 1 萬 位使用者造訪過 events.carrefour.com.tw

    盛夏想要節能涼爽？該換變頻冷氣了！指定商品最高折$500，多品牌任你挑，再把KIA電動車抽回家！ 買冷氣抽KIA百萬電動車！選購指定商品滿$5000折$500，月月再抽節能減碳獎勵金，快來家樂福挑選！

搜尋結果

  1. 輕鋼架節能循環扇價格 - 購物搜尋結果

    更多 輕鋼架節能循環扇價格 相關商品

  2. en.wikipedia.org › wiki › List_of_AMD_Ryzen_processorsList of AMD Ryzen processors - Wikipedia

    The Ryzen family is an x86-64 microprocessor family from AMD, based on the Zen microarchitecture. The Ryzen lineup includes Ryzen 3, Ryzen 5, Ryzen 7, Ryzen 9, and Ryzen Threadripper with up to 96 cores. All consumer desktop Ryzens (except PRO models) and all mobile processors with the HX suffix have an unlocked multiplier.

  3. en.wikipedia.org › wiki › Airbus_A350Airbus A350 - Wikipedia

    Number built. 598 as of 30 April 2024 [update] [4] The Airbus A350 is a long-range, wide-body twin-engine airliner developed and produced by Airbus . The initial A350 design proposed by Airbus in 2004, in response to the Boeing 787 Dreamliner, would have been a development of the Airbus A330 with composite wings and new engines.

    • Two
    • 440 seats
    • 36 LD3 or 11 pallets
    • 315 (48J+267Y)

  4. en.wikipedia.org › wiki › PolytetrafluoroethylenePolytetrafluoroethylene - Wikipedia

    • History
    • Production
    • Properties
    • Processing
    • Applications and Uses
    • Safety
    • Ecotoxicity
    • Similar Polymers
    • See Also
    • Further Reading

    Polytetrafluoroethylene (PTFE) was accidentally discovered in 1938 by Roy J. Plunkett while he was working in New Jersey for DuPont. As Plunkett attempted to make a new chlorofluorocarbon refrigerant, the tetrafluoroethylene gas in its pressure bottle stopped flowing before the bottle's weight had dropped to the point signaling "empty". Since Plunk...

    在「en.wikipedia.org」查看更多資訊

    PTFE is produced by free-radical polymerization of tetrafluoroethylene.The net equation is 1. n F2C=CF2 → −(F2C−CF2)n− Because tetrafluoroethylene can explosively decompose to tetrafluoromethane (CF4) and carbon, a special apparatus is required for the polymerization to prevent hot spots that might initiate this dangerous side reaction. The process...

    在「en.wikipedia.org」查看更多資訊

    PTFE is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2200 kg/m3 and a melting point of 600 K (327 °C; 620 °F). It maintains high strength, toughness and self-lubrication at low temperatures down to 5 K (−268.15 °C; −450.67 °F), and good flexibility at temperatures above 194 K (−79 °C; −110 °F). PTFE g...

    在「en.wikipedia.org」查看更多資訊

    Processing PTFE can be difficult and expensive, because the high melting temperature, 327 °C (621 °F), is above the decomposition temperature. Even when molten, PTFE does not flow due to its exceedingly high melt-viscosity. The viscosity and melting point can be decreased by inclusion of small amount of comonomers such as perfluoro (propylvinyl eth...

    在「en.wikipedia.org」查看更多資訊

    Wire insulation, electronics

    The major application of PTFE, consuming about 50% of production, is for the insulation of wiring in aerospace and computer applications (e.g. hookup wire, coaxial cables). This application exploits the fact that PTFE has excellent dielectric properties, specifically low group velocity dispersion, especially at high radio frequencies, making it suitable for use as an excellent insulator in connector assemblies and cables, and in printed circuit boards used at microwave frequencies. Combined w...

    Bearings seals

    In industrial applications, owing to its low friction, PTFE is used for plain bearings, gears, slide plates, seals, gaskets, bushings, and more applications with sliding action of parts, where it outperforms acetal and nylon.

    Electrets

    Its extremely high bulk resistivity makes it an ideal material for fabricating long-life electrets, the electrostatic analogues of permanent magnets.

    在「en.wikipedia.org」查看更多資訊

    While PTFE is stable at lower temperatures, it begins to deteriorate at temperatures of about 260 °C (500 °F), it decomposes above 350 °C (662 °F), and pyrolysis occurs at temperatures above 400 °C (752 °F). The main decomposition products are fluorocarbon gases and a sublimate, including tetrafluoroethylene (TFE) and difluorocarbene radicals(RCF2)...

    在「en.wikipedia.org」查看更多資訊

    Trifluoroacetate

    Sodium trifluoroacetate and the similar compound sodium chlorodifluoroacetate can both be generated when PTFE undergoes thermolysis, as well as producing longer chain polyfluoro- and/or polychlorofluoro- (C3-C14) carboxylic acids which may be equally persistent. These products can accumulate in evaporative wetlandsand have been found in the roots and seeds of wetland plant species, but has not been observed to have an adverse impact on plant health or germination success.

    PFOA

    Perfluorooctanoic acid (PFOA, or C8) has been used as a surfactant in the emulsion polymerizationof PTFE, although several manufacturers have entirely discontinued its use. PFOA persists indefinitely in the environment. PFOA has been detected in the blood of many individuals of the general US population in the low and sub-parts per billion range, and levels are higher in chemical plant employees and surrounding subpopulations. PFOA and perfluorooctanesulfonic acid (PFOS) have been estimated t...

    GenX

    As a result of the lawsuits concerning the PFOA class-action lawsuit, DuPont began to use GenX, a similarly fluorinated compound, as a replacement for perfluorooctanoic acid in the manufacture of fluoropolymers, such as Teflon-brand PTFE.However, in lab tests on rats, GenX has been shown to cause many of the same health problems as PFOA. The chemicals are manufactured by Chemours, a corporate spin-off of DuPont, in Fayetteville, North Carolina. Fayetteville Works was the site where DuPont beg...

    在「en.wikipedia.org」查看更多資訊

    The Teflon trade name is also used for other polymers with similar compositions: 1. Perfluoroalkoxy alkane(PFA) 2. Fluorinated ethylene propylene(FEP) These retain the useful PTFE properties of low friction and nonreactivity, but are also more easily formable. For example, FEP is softer than PTFE and melts at 533 K (260 °C; 500 °F); it is also high...

    在「en.wikipedia.org」查看更多資訊

    BS 4994, PTFE as a thermoplastic lining for dual laminate chemical process plant equipment
    Dark Waters, a film about litigation related to PFOA
    The Devil We Know, documentary on PFOA's health and environmental effects
    ETFE

    在「en.wikipedia.org」查看更多資訊

    Ellis, D.A.; Mabury, S.A.; Martin, J.W.; Muir, D.C.G.; Mabury, S.A.; Martin, J.W.; Muir, D.C.G. (2001). "Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the envi...

    在「en.wikipedia.org」查看更多資訊

  5. en.wikipedia.org › wiki › Lockheed_Martin_F-35_Lightning_IILockheed Martin F-35 Lightning II - Wikipedia

    2006–present. Number built. 1,000+ [4] Developed from. Lockheed Martin X-35. The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, stealth multirole combat aircraft designed for air superiority and strike missions; it also has electronic warfare and intelligence, surveillance, and reconnaissance capabilities.

  6. en.wikipedia.org › wiki › Earth_DayEarth Day - Wikipedia

    Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network)[1] including 1 billion people in more than 193 countries.[2][1][3] The official theme for 2024 is "Planet vs ...

  7. en.wikipedia.org › wiki › Richter_scaleRichter scale - Wikipedia

    v. t. e. The Richter scale [1] ( / ˈrɪktər / ), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Francis Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it ...

  8. en.wikipedia.org › wiki › 3_Body_Problem_(TV_series)3 Body Problem (TV series) - Wikipedia

    3 Body Problem is an American science fiction television series created by David Benioff, D. B. Weiss and Alexander Woo, based on the Hugo Award–winning Chinese novel series Remembrance of Earth's Past by Liu Cixin. It is the second live-action adaptation after the 2023 Chinese television series. The first season was released on Netflix on ...