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• Energy Technology
  Nuclear Energy
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  Energy

  In general, the word energy refers to a concept that can be paraphrased as "the potential for causing changes", and therefore one can say that energy is the cause of any change. The most common ... > more
• Sports Science
  Physics
  Medical Technology
  Acoustics
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  Hertz

  The hertz (symbol: Hz) is the SI unit of frequency. One hertz simply means "one per second" (1 / s); 100 Hz means "one hundred per second", and so ... > more
• Healthy Aging
  Attention Deficit Disorder
  Inorganic Chemistry
  Chemistry
  Sports Medicine
  Sports Science
   
  

  Bismuth

  Bismuth is a chemical element in the periodic table that has the symbol Bi and atomic number 83. This heavy, brittle, white crystalline trivalent poor metal has a pink tinge and chemically resembles ... > more
• Sports Science
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  Chemistry
  Inorganic Chemistry
  Nuclear Energy
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  Hafnium

  Hafnium is a chemical element in the periodic table that has the symbol Hf and atomic number 72. A lustrous, silvery gray tetravalent transition metal, hafnium resembles zirconium chemically and is ... > more
• Information Technology
  Hacking
  Encryption
  Biometric
  Engineering
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  Security engineering

  Security engineering is the field of engineering dealing with the security and integrity of real-world systems. It is similar to systems engineering in that its motivation is to make a system meet ... > more
• Sports Science
  Chemistry
  Inorganic Chemistry
  Weapons Technology
  Physics
  Batteries
   
  

  Beryllium

  Beryllium is the chemical element in the periodic table that has the symbol Be and atomic number 4. A toxic bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline ... > more
• Aviation
  Vehicles
  Weapons Technology
  Sports Science
  Nuclear Energy
  Transportation Science
   
  

  Cruise missile

  A cruise missile is a guided missile which uses a lifting wing and most often a jet propulsion system to allow sustained flight. Cruise missiles are, in essence, unmanned aircraft. They are generally ... > more
• Civil Engineering
  Engineering
  Energy Technology
  Environmental Science
  Geochemistry
  Geology
   
  

  Civil engineering

  In modern usage, civil engineering is a broad field of engineering that deals with the planning, construction, and maintenance of fixed structures, or public works, as they are related to earth, ... > more
• Electricity
  Energy Technology
  Solar Energy
  Batteries
  Wind Energy
  Sports Science
   
  

  Three-phase electric power

  Three-phase is a common method of electric power transmission. It is a type of polyphase system used to power motors and many other devices. Three phase has properties that make it very desirable in ... > more
• Chemistry
  Inorganic Chemistry
  Nature of Water
  Sports Science
  Organic Chemistry
  Petroleum
   
  

  Argon

  Argon is a chemical element in the periodic table. It has the symbol Ar and atomic number 18. The third noble gas, in group 18, argon makes up about 1% of the Earth's atmosphere, making it the most ... > more

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