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  2. Qualified residence interest - Wikipedia

    en.wikipedia.org/wiki/Qualified_residence_interest

    In effect, the Tax Reform Act changed § 163 from a general rule for deduction into one of non-deduction with six discreet exceptions. [3] These exceptions, listed in § 163(h)(2), include exceptions for active business interest, taxable investment interest, passive activity business interest, estate tax interest, and education loan interest ...

  3. Torsion constant - Wikipedia

    en.wikipedia.org/wiki/Torsion_constant

    In 1820, the French engineer A. Duleau derived analytically that the torsion constant of a beam is identical to the second moment of area normal to the section J zz, which has an exact analytic equation, by assuming that a plane section before twisting remains planar after twisting, and a diameter remains a straight line.

  4. Section (United States land surveying) - Wikipedia

    en.wikipedia.org/wiki/Section_(United_States...

    The existence of section lines made property descriptions far more straightforward than the old metes and bounds system. The establishment of standard east-west and north-south lines ("township" and "range lines") meant that deeds could be written without regard to temporary terrain features such as trees, piles of rocks, fences, and the like, and be worded in the style such as "Lying and ...

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  7. J-integral - Wikipedia

    en.wikipedia.org/wiki/J-integral

    The J-integral represents a way to calculate the strain energy release rate, or work per unit fracture surface area, in a material. [1] The theoretical concept of J-integral was developed in 1967 by G. P. Cherepanov [2] and independently in 1968 by James R. Rice, [3] who showed that an energetic contour path integral (called J) was independent of the path around a crack.

  8. Unified Parkinson's disease rating scale - Wikipedia

    en.wikipedia.org/wiki/Unified_Parkinson's_disease...

    Following the UPDRS scores over time provides insight into the patient's disease progression. For instance Michael J. Fox's symptoms started with a slight tremor, so his motor score would have been less than 10. For most patients, the "mentation, behavior and mood" scores increase later in the disease, but a subset exists for whom those ...

  9. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...