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2. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. The major diameter still extends to within ⁠ 1 / 8 ⁠ H of the theoretical sharp V, but the total depth of the thread is reduced 4% from ⁠ 5 / 8 ⁠ H = ⁠ 5 / 8 ⁠ cos(30°) P ≈ 0.541P to 0.52P.

3. Fractional ownership - Wikipedia

   en.wikipedia.org/wiki/Fractional_ownership

   Fractional ownership. Fractional ownership is a method in which several unrelated parties can share in, and mitigate the risk of, ownership of a high-value tangible asset, usually a jet, yacht or piece of resort real estate. It can be done for strictly monetary reasons, but typically there is some amount of personal access involved.

4. HO scale - Wikipedia

   en.wikipedia.org/wiki/HO_scale

   HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). It is the most popular scale of model railway in the world. [1] [2] The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge tracks and trains in HO.

5. Rail transport modelling scales - Wikipedia

   en.wikipedia.org/wiki/Rail_transport_modelling...

   One of the smallest ( Z scale, 1:220) placed on the buffer beam of one of the largest ( Live steam, 1:8) model locomotives. Rail transport modelling uses a variety of scales (ratio between the real world and the model) to ensure scale models look correct when placed next to each other. Model railway scales are standardized worldwide by many ...

6. Scale model - Wikipedia

   en.wikipedia.org/wiki/Scale_model

   Models are built to scale, defined as the ratio of any linear dimension of the model to the equivalent dimension on the full-size subject (called the "prototype"), expressed either as a ratio with a colon (ex. 1:8 scale), or as a fraction with a slash (1/8 scale). This designates that 1 inch (or centimeter) on the model represents 8 such units ...

7. Mathematical model - Wikipedia

   en.wikipedia.org/wiki/Mathematical_model

   A mathematical model is an abstract description of a concrete system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling. Mathematical models are used in applied mathematics and in the natural sciences (such as physics, biology, earth science, chemistry) and engineering ...

8. Precision and recall - Wikipedia

   en.wikipedia.org/wiki/Precision_and_recall

   Precision and recall. Precision and recall. In pattern recognition, information retrieval, object detection and classification (machine learning), precision and recall are performance metrics that apply to data retrieved from a collection, corpus or sample space . Precision (also called positive predictive value) is the fraction of relevant ...

9. Unit fraction - Wikipedia

   en.wikipedia.org/wiki/Unit_fraction

   Slices of approximately 1/8 of a pizza. A unit fraction is a positive ... 1/5, etc. When an object is divided into equal parts, each part is a unit fraction of the ...