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2. Euler's critical load - Wikipedia

   en.wikipedia.org/wiki/Euler's_critical_load

   Fig. 1: Critical stress vs slenderness ratio for steel, for E = 200 GPa, yield strength = 240 MPa. Euler's critical load or Euler's buckling load is the compressive load at which a slender column will suddenly bend or buckle. It is given by the formula: [1] = where

3. Johnson's parabolic formula - Wikipedia

   en.wikipedia.org/wiki/Johnson's_parabolic_formula

   The slenderness ratio is an indicator of the specimen's resistance to bending and buckling, due to its length and cross section. If the slenderness ratio is less than the critical slenderness ratio, the column is considered to be a short column. In these cases, the Johnson parabola is more applicable than the Euler formula. [5]

4. Compression set - Wikipedia

   en.wikipedia.org/wiki/Compression_set

   Compression set A is defined as the percentage of original specimen thickness after the specimen has been left in normal (uncompressed) conditions for 30 minutes. C A, the compression set A is given by C A = [(t o - t i) / t o] * 100 where t o is the original specimen thickness and t i is the specimen thickness after testing. [2]

5. Compression ratio - Wikipedia

   en.wikipedia.org/wiki/Compression_ratio

   For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.5 1.3 × atmospheric pressure, or 13.7 bar (relative to atmospheric pressure). The two corrections for dynamic compression ratio affect cylinder pressure in opposite directions, but not in equal strength.

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7. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   Round duct elbow allowable stresses are lower than the allowable stresses for straight duct by a K factor = 1.65/(h 2/3power) where h = t (duct) * R (elbow) /(r(duct)*r (duct). This equation, or similar equations is found in Tubular Steel Structures section 9.9. Rectangular ductwork design properties is based on width-to-thickness ratios.

8. Thermal efficiency - Wikipedia

   en.wikipedia.org/wiki/Thermal_efficiency

   [4]: 558 = Thus, the efficiency increases with the compression ratio. However the compression ratio of Otto cycle engines is limited by the need to prevent the uncontrolled combustion known as knocking. Modern engines have compression ratios in the range 8 to 11, resulting in ideal cycle efficiencies of 56% to 61%.

9. What You Need To Do Before It Gets Ridiculously Cold

   www.aol.com/gets-ridiculously-cold-103500516.html

   Remember the four P's when dealing with cold: Pets, Pipes, Plants and People (elderly and young). Bring pets inside and make sure they have plenty of food and water as well.