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  2. Physikalisch-Technische Bundesanstalt - Wikipedia

    en.wikipedia.org/wiki/Physikalisch-Technische...

    The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks.It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Climate Action.

  3. All India Secondary School Examination - Wikipedia

    en.wikipedia.org/wiki/All_India_Secondary_School...

    All India Secondary School Examination, commonly known as the class 10th board exam, is a centralized public examination that students in schools affiliated with the Central Board of Secondary Education, primarily in India but also in other Indian-patterned schools affiliated to the CBSE across the world, taken at the end of class 10. The board ...

  4. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    Some examples of NMI's are the National Institute of Standards and Technology (NIST) [60] in the United States, the National Research Council (NRC) [61] in Canada, the Physikalisch-Technische Bundesanstalt (PTB) in Germany, [62] and the National Physical Laboratory (United Kingdom) (NPL).

  5. Lectures on Theoretical Physics - Wikipedia

    en.wikipedia.org/.../Lectures_on_Theoretical_Physics

    Lectures on Theoretical Physics is a six-volume series of physics textbooks translated from Arnold Sommerfeld's classic German texts Vorlesungen über Theoretische Physik. The series includes the volumes Mechanics , Mechanics of Deformable Bodies , Electrodynamics , Optics , Thermodynamics and Statistical Mechanics , and Partial Differential ...

  6. Politehnica University of Bucharest - Wikipedia

    en.wikipedia.org/wiki/Politehnica_University_of...

    Gheorghe Duca tried and succeeded to bring the best professors to the “National School of Bridges and Roads”; among these were David Emmanuel (Elementary Mathematics), Spiru Haret (Higher Algebra and Analytical Geometry), C. M. Mironescu (Statistics and Engineering Graphics), Constantin Istrati (Physics), or Anghel Saligny (Bridges and ...

  7. Lecture Notes in Physics - Wikipedia

    en.wikipedia.org/wiki/Lecture_Notes_in_Physics

    Lecture Notes in Physics (LNP) is a book series published by Springer Science+Business Media in the field of physics, including articles related to both research and teaching. It was established in 1969.

  8. Boltzmann constant - Wikipedia

    en.wikipedia.org/wiki/Boltzmann_constant

    Boltzmann constant: The Boltzmann constant, k, is one of seven fixed constants defining the International System of Units, the SI, with k = 1.380 649 x 10 −23 J K −1.The Boltzmann constant is a proportionality constant between the quantities temperature (with unit kelvin) and energy (with unit joule).

  9. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    In August 2016 the French LNE-SYRTE in Paris and the German PTB in Braunschweig reported the comparison and agreement of two fully independent experimental strontium lattice optical clocks in Paris and Braunschweig at an uncertainty of 5 × 10 −17 via a newly established phase-coherent frequency link connecting Paris and Braunschweig, using ...