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  2. Vaillant Group - Wikipedia

    en.wikipedia.org/wiki/Vaillant_Group

    The history of the Vaillant Group dates back to 1874, when Johann Vaillant set up a master fitter's business. In 1894 Johann Vaillant patented a new "closed-system" gas-fired bathroom boiler. [3] This was the first device that made it possible to heat water hygienically, without contaminating it with combustion gases.

  3. Troubleshooting - Wikipedia

    en.wikipedia.org/wiki/Troubleshooting

    Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.

  4. Freezing-point depression - Wikipedia

    en.wikipedia.org/wiki/Freezing-point_depression

    In the above equation, T F is the normal freezing point of the pure solvent (273 K for water, for example); a liq is the activity of the solvent in the solution (water activity for aqueous solution); ΔH fus T F is the enthalpy change of fusion of the pure solvent at T F, which is 333.6 J/g for water at 273 K; ΔC fus p is the difference ...

  5. Problem solving - Wikipedia

    en.wikipedia.org/wiki/Problem_solving

    Problem solving in psychology refers to the process of finding solutions to problems encountered in life. [5] Solutions to these problems are usually situation- or context-specific. The process starts with problem finding and problem shaping, in which the problem is discovered and simplified. The next step is to generate possible solutions and ...

  6. John Vaillant - Wikipedia

    en.wikipedia.org/wiki/John_Vaillant

    John Vaillant (born 1962) is an American Canadian writer and journalist whose work has appeared in The New Yorker, The Atlantic, National Geographic, and Outside. He has written both non-fiction and fiction books.

  7. George Eman Vaillant - Wikipedia

    en.wikipedia.org/wiki/George_Eman_Vaillant

    George Eman Vaillant (/ v ə ˈ l æ n t /; born June 16, 1934) is an American psychiatrist and Professor at Harvard Medical School and Director of Research for the Department of Psychiatry, Brigham and Women's Hospital.

  8. Pure Earth - Wikipedia

    en.wikipedia.org/wiki/Pure_Earth

    In 2017, Pure Earth President Richard Fuller and Dr. Philip Landrigan, serving as co-chairs of the Lancet Commission on Pollution and Health, [2] issued an open letter, [8] and presided over the release of the landmark report from the commission, which confirmed in 2017 that pollution is the largest environmental cause of disease and premature death in the world, causing 3 times as many deaths ...

  9. Form, fit and function - Wikipedia

    en.wikipedia.org/wiki/Form,_fit_and_function

    Form, Fit, and Function (also F3 or FFF) is a concept used in various industries, including manufacturing, engineering, and architecture, to describe aspects of a product's design, performance, and compliance to a specification.