Suchergebnisse

Purpose. The purpose of this study was to identify the environmental correlates of urban trail use. Design. Three multiuse urban trails at least 15 miles in length were selected. Trails were divided into one-half-mile segments (N = 102 total segments) and marked in the field. An audit of each trail was completed identifying built environmental features. A cross-sectional count of trail users was completed at each segment estimating the type of use, age, gender. Setting. Data collection occurred on urban trails in Chicago, Dallas, and Los Angeles. Subjects. Trained observers counted 17,338 users across the three trails. Measures. The SPACES for Trails instrument was used, and a trail count data collection sheet was developed. Analysis. Univariate and multivariate Poisson regressions controlling for location of trail and density of the population within 1 mile of the trail. Results. Positive associations with trail use were observed for mixed views (β = .33, p < .0001), streetlights (β = .30, p < .0001), good trail condition (β = .28, p < .0001), and the presence of cafés (β = .38, p < .0001) and other trailside facilities (β = .08, p < .0001). Negative associations were observed for litter (β = −.22, p < .0001), noise (β = −.41, p < .0001), higher vegetation density (β = −.10, p > .001), drainage features (β = −.67, p < .0003), natural areas adjacent to the trail (β = −.39, p < .0001), and tunnel present (β = −.20, p < .04). Conclusions. These correlates should be confirmed in other studies and if supported should be considered in the promotion and design of urban trails.

This document brings together three notable topics: NACA, Max M. Munk, and the Caproni Seaplane. The report is NACA Technical Note No. 57, written by NACA researcher Munk on the failed design of the Caproni Company's 1921 Seaplane.

The first thing that you feel when an airplane lands is the effect of the brakes to slow it down. But, as the report "The Use of Wheel Brakes on Airplanes" points out, the use of brakes had to be proven to be safe before becoming part of standard operating procedures.

The United States emerged from World War II with technical knowledge about nuclear power, but very few options to use that power for positive outcomes. One attempt to funnel this knowledge into beneficial use was the Plowshare Program: "Swords Into Plowshares" established by the United States Atomic Energy Commission (AEC) to study and develop peaceful uses for nuclear explosives in science and industry. Plowshare advocates proposed using nuclear explosions to create craters to be used for excavations for projects such as canals and harbors, and deep underground explosions to be used for mining as well as recovery of oil and gas.

Luigi and Kate deliberate over the topics that will be discussed on Capitalisn't -- they range from market power to Italian history.