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  2. Principles and Standards for School Mathematics - Wikipedia

    en.wikipedia.org/wiki/Principles_and_Standards...

    The Principles and Standards for School Mathematics was developed by the NCTM. The NCTM's stated intent was to improve mathematics education. The contents were based on surveys of existing curriculum materials, curricula and policies from many countries, educational research publications, and government agencies such as the U.S. National Science Foundation. [3]

  3. National Science Education Standards - Wikipedia

    en.wikipedia.org/wiki/National_Science_Education...

    The content of these standards is based heavily on a specific model of learning, constructivism (learning theory). [4] Like reform mathematics, [5] which is distinguished by an emphasis on building on what a child already knows and understands, the standards intend to update the methods of science education to achieve greater effectiveness with children.

  4. Betz's law - Wikipedia

    en.wikipedia.org/wiki/Betz's_law

    The law is derived from the principles of conservation of mass and momentum of the air stream flowing through an idealized "actuator disk" that extracts energy from the wind stream. According to Betz's law, no wind turbine of any mechanism can capture more than 16/27 (59.3%) of the kinetic energy in wind.

  5. Beaufort scale - Wikipedia

    en.wikipedia.org/wiki/Beaufort_scale

    These designations were standardised nationally in 2008, whereas "light wind" can refer to 0 to 12 or 0 to 15 knots and "moderate wind" 12 to 19 or 16 to 19 knots, depending on regional custom, definition or practice. Prior to 2008, a "strong wind warning" would have been referred to as a "small craft warning" by Environment Canada, similar to ...

  6. Energy - Wikipedia

    en.wikipedia.org/wiki/Energy

    Energy (from Ancient Greek ἐνέργεια (enérgeia) 'activity') is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.

  7. Science, technology, engineering, and mathematics - Wikipedia

    en.wikipedia.org/wiki/Science,_technology...

    The Science, Technology, Engineering, and Mathematics (STEM) Education Coalition [103] works to support STEM programs for teachers and students at the U.S. Department of Education, the National Science Foundation, and other agencies that offer STEM-related programs. Activity of the STEM Coalition seems to have slowed since September 2008.

  8. Wind power - Wikipedia

    en.wikipedia.org/wiki/Wind_power

    On seasonal timescales, solar energy peaks in summer, whereas in many areas wind energy is lower in summer and higher in winter. [A] [75] Thus the seasonal variation of wind and solar power tend to cancel each other somewhat. [72] Wind hybrid power systems are becoming more popular. [76]

  9. Wind erosion equation - Wikipedia

    en.wikipedia.org/wiki/Wind_erosion_equation

    A wind erosion equation is an equation used to design wind erosion control systems, which considers soil erodibility, soil roughness, climate, the unsheltered distance across a field, and the vegetative cover on the ground.

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