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  2. Pacific Railroad Surveys - Wikipedia

    en.wikipedia.org/wiki/Pacific_Railroad_Surveys

    An illustration of Fort Massachusetts, Colorado, made during the surveys. The Pacific Railroad Surveys (1853–1855) were a series of explorations of the American West designed to find and document possible routes for a transcontinental railroad across North America.

  3. Parity progression ratios - Wikipedia

    en.wikipedia.org/wiki/Parity_progression_ratios

    Parity progression ratios. A parity progression ratios (PPR) is a measure commonly used in demography to study fertility. The PPR is simply the proportion of women with a certain number of children who go on to have another child. Calculating the PPR, also known as , can be achieved by using the following formula : [1] In more developed ...

  4. Pennsylvania Railroad class J1 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_class_J1

    Pennsylvania Railroad class J1. Water cap. 124 scrapped, 6435 rumored to still extant but not confirmed. The PRR J1 was a class of 2-10-4 "Texas" type steam locomotives built between 1942 and 1944. The J1 had over 95,000 pounds-force (422.6 kN) of tractive effort, plus an additional 15,000 lbf (66.7 kN) if the booster engine was used.

  5. South Texas Nuclear Generating Station - Wikipedia

    en.wikipedia.org/wiki/South_Texas_Nuclear...

    The South Texas Project Electric Generating Station (also known as STP, STPEGS, South Texas Project), is a nuclear power station southwest of Bay City, Texas, United States. STP occupies a 12,200-acre (4,900 ha) site west of the Colorado River about 90 miles (140 km) southwest of Houston .

  6. Philosophy and Phenomenological Research - Wikipedia

    en.wikipedia.org/wiki/Philosophy_and...

    Res. Philosophy and Phenomenological Research ( PPR) is a bimonthly philosophy journal founded in 1940. Until 1980, it was edited by Marvin Farber, then by Roderick Chisholm, and since 1986 by Ernest Sosa. It considers itself open to a variety of methodologies and traditions, as indicated by a statement appearing in each issue: "PPR publishes ...

  7. Pulsed plasma thruster - Wikipedia

    en.wikipedia.org/wiki/Pulsed_plasma_thruster

    A pulsed plasma thruster (PPT), also known as a Pulsed Plasma Rocket (PPR), or as a plasma jet engine (PJE), is a form of electric spacecraft propulsion. [1] PPTs are generally considered the simplest form of electric spacecraft propulsion and were the first form of electric propulsion to be flown in space, having flown on two Soviet probes (Zond 2 and Zond 3) starting in 1964. [2]

  8. Projection pursuit regression - Wikipedia

    en.wikipedia.org/wiki/Projection_pursuit_regression

    Projection pursuit regression. In statistics, projection pursuit regression (PPR) is a statistical model developed by Jerome H. Friedman and Werner Stuetzle that extends additive models. This model adapts the additive models in that it first projects the data matrix of explanatory variables in the optimal direction before applying smoothing ...

  9. State of Texas Assessments of Academic Readiness - Wikipedia

    en.wikipedia.org/wiki/State_of_Texas_Assessments...

    The State of Texas Assessments of Academic Readiness, commonly referred to as its acronym STAAR ( / stɑːr / STAR ), is a series of standardized tests used in Texas public primary and secondary schools to assess a student's achievements and knowledge learned in the grade level. It tests curriculum taught from the Texas Essential Knowledge and ...

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