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  2. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. [3]

  3. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon. Racon signal as seen on a radar screen. This beacon receives using sidelobe suppression and transmits the letter "Q" in Morse code near Boston Harbor (Nahant) 17 January 1985. Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1 ...

  4. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

  5. Los Angeles abrasion test - Wikipedia

    en.wikipedia.org/wiki/Los_Angeles_abrasion_test

    The Los Angeles abrasion test (LA abrasion) is the North American standard for testing toughness (resistance to abrasion and degradation [1]) of construction aggregate or gravel and its suitability for road construction. Test methodology and equipment is defined in the ASTM International publications ASTM C131 for particle sizes smaller than 37 ...

  6. Cement - Wikipedia

    en.wikipedia.org/wiki/Cement

    A minimum temperature of 5 °C is recommended, and no more than 30 °C. [51] The concrete at young age must be protected against water evaporation due to direct insolation, elevated temperature, low relative humidity and wind. The interfacial transition zone (ITZ) is a region of the cement paste around the aggregate particles in concrete.

  7. Sodium hydroxide - Wikipedia

    en.wikipedia.org/wiki/Sodium_hydroxide

    4 Fe + 6 NaOH → 2 Fe 2 O 3 + 6 Na + 3 H 2 A few transition metals , however, may react quite vigorously with sodium hydroxide under milder conditions. In 1986, an aluminium road tanker in the UK was mistakenly used to transport 25% sodium hydroxide solution, [ 23 ] causing pressurization of the contents and damage to tankers.

  8. Aluminium oxynitride - Wikipedia

    en.wikipedia.org/wiki/Aluminium_oxynitride

    Aluminium oxynitride (marketed under the name ALON by Surmet Corporation [3]) is a transparent ceramic composed of aluminium, oxygen and nitrogen. Aluminium oxynitride is optically transparent (≥ 80%) in the near-ultraviolet, visible, and mid-wave- infrared regions of the electromagnetic spectrum. It is four times as hard as fused silica ...

  9. Parking meter - Wikipedia

    en.wikipedia.org/wiki/Parking_meter

    An in-vehicle parking meter is a handheld electronic device, the size of a pocket calculator, that drivers display in their car windows as a parking permit or as proof of parking payment. [36] Implementation of IVPM began in the late 1980s in Arlington, VA , [ 37 ] and is spreading to campuses and municipalities worldwide as a centralized ...

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