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  2. Fourth power law - Wikipedia

    en.wikipedia.org/wiki/Fourth_power_law

    This example illustrates how a car and a truck affect the surface of a road differently according to the fourth power law. Car (total weight 2 tonnes , 2 axles): load per axle: 1 tonnes Truck (total weight 30 tonnes, 3 axles): load per axle: 10 tonnes

  3. Cooling load temperature difference calculation method

    en.wikipedia.org/wiki/Cooling_load_temperature...

    The cooling load temperature difference (CLTD) calculation method, also called the cooling load factor (CLF) or solar cooling load factor (SCL) method, is a method of estimating the cooling load or heating load of a building. It was introduced in the 1979 ASHRAE handbook.

  4. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    The need for day count conventions is a direct consequence of interest-earning investments. Different conventions were developed to address often conflicting requirements, including ease of calculation, constancy of time period (day, month, or year) and the needs of the accounting department.

  5. Energy return on investment - Wikipedia

    en.wikipedia.org/wiki/Energy_return_on_investment

    The issue is still subject of numerous studies, and prompting academic argument. That's mainly because the "energy invested" critically depends on technology, methodology, and system boundary assumptions, resulting in a range from a maximum of 2000 kWh/m 2 of module area down to a minimum of 300 kWh/m 2 with a median value of 585 kWh/m 2 according to a meta-study from 2013.

  6. Per-unit system - Wikipedia

    en.wikipedia.org/wiki/Per-unit_system

    As an example of how per-unit is used, consider a three-phase power transmission system that deals with powers of the order of 500 MW and uses a nominal voltage of 138 kV for transmission. We arbitrarily select S b a s e = 500 M V A {\\displaystyle S_{\\mathrm {base} }=500\\,\\mathrm {MVA} } , and use the nominal voltage 138 kV as the base ...

  7. Mass balance - Wikipedia

    en.wikipedia.org/wiki/Mass_balance

    In environmental monitoring, the term budget calculations is used to describe mass balance equations where they are used to evaluate the monitoring data (comparing input and output, etc.). In biology , the dynamic energy budget theory for metabolic organisation makes explicit use of mass and energy balance.

  8. 3 Stock Market Mistakes Investors Should Avoid in 2025 - AOL

    www.aol.com/3-stock-market-mistakes-investors...

    AAPL Market Cap data by YCharts. Other noteworthy examples include selling out of oil and gas stocks during the downturn of 2020. In the last four years, the energy sector is up 129%.

  9. Expected shortfall - Wikipedia

    en.wikipedia.org/wiki/Expected_shortfall

    Expected shortfall (ES) is a risk measure—a concept used in the field of financial risk measurement to evaluate the market risk or credit risk of a portfolio. The "expected shortfall at q% level" is the expected return on the portfolio in the worst % of cases.