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  2. Calthemite - Wikipedia

    en.wikipedia.org/wiki/Calthemite

    Hence, CO 2 rich groundwater or rainwater would form carbonic acid (H 2 CO 3) (≈pH 7.58.5) [17] [19] and leach Ca 2+ from the structure as the solution seeps through the old cracks . [15] This is more likely to occur in thin layered concrete such as that sprayed inside vehicle or railway tunnels to stabilise loose material. [ 20 ]

  3. Next Generation Science Standards - Wikipedia

    en.wikipedia.org/wiki/Next_Generation_Science...

    Creating science-literate citizens; Creating common standards for teaching in the U.S. Making science and engineering relevant for and accessible to all students; Developing greater interest in science among students so that more of them choose to major in science and technology in college. Overall, the guidelines are intended to;

  4. UNESCO Science Report - Wikipedia

    en.wikipedia.org/wiki/UNESCO_Science_Report

    The UNESCO Science Report is a global monitoring report published regularly by the United Nations Educational, Scientific and Cultural Organization.Every five years, this report maps the latest trends and developments in national and regional policy landscapes, against the backdrop of shifting socio-economic, geopolitical and environmental realities.

  5. Table (information) - Wikipedia

    en.wikipedia.org/wiki/Table_(information)

    This is a simplified description of the most basic kind of table. Certain considerations follow from this simplified description: the term row has several common synonyms (e.g., record, k-tuple, n-tuple, vector); the term column has several common synonyms (e.g., field, parameter, property, attribute, stanchion);

  6. Cone penetration test - Wikipedia

    en.wikipedia.org/wiki/Cone_penetration_test

    The test method consists of pushing an instrumented cone, with the tip facing down, into the ground at a controlled rate (controlled between 1.5 -2.5 cm/s accepted). The resolution of the CPT in delineating stratigraphic layers is related to the size of the cone tip, with typical cone tips having a cross-sectional area of either 10 or 15 cm 2 ...

  7. Simplified perturbations models - Wikipedia

    en.wikipedia.org/wiki/Simplified_perturbations...

    Simplified Deep Space Perturbations (SDP) models apply to objects with an orbital period greater than 225 minutes, which corresponds to an altitude of 5,877.5 km, assuming a circular orbit. [ 3 ] The SGP4 and SDP4 models were published along with sample code in FORTRAN IV in 1988 with refinements over the original model to handle the larger ...

  8. Science - Wikipedia

    en.wikipedia.org/wiki/Science

    Science is a systematic discipline that builds and organises knowledge in the form of testable hypotheses and predictions about the universe. [1] [2] Modern science is typically divided into two or three major branches: [3] the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; and the social sciences (e.g., economics, psychology, and sociology), which ...

  9. IPCC Fifth Assessment Report - Wikipedia

    en.wikipedia.org/wiki/IPCC_Fifth_Assessment_Report

    [5] [1] The report was delivered in stages, starting with the report from Working Group I in September 2013. [5] It reported on the physical science basis, based on 9,200 peer-reviewed studies. [6] [7] The Synthesis Report was released on 2 November 2014, [8] in time to pave the way for negotiations on reducing carbon emissions at the UN ...