Rural Illinois in the 1990s: On the Rebound?

Rural areas of Illinois experienced a widespread population rebound between 1990 and 1995.2 These recent population gains in Illinois are consistent with a broader rural population growth revival nationwide. Rural Illinois gain nearly 24,000 residents between 1990 and 1995, according to recently released estimates by the U.S. Census Bureau.3 The population grew in 47 of the 74 nonmetropolitan counties in Illinois during the period. Migration to rural areas accounted for most of this population gain. Most urban areas in Illinois also gained population during the first half of the 1990s. The recent population gains in rural Illinois are modest, but they represent a significant change from the substantial population losses in the same areas during the 1980s

Estimating unsteady aerodynamic forces on a cascade in a three-dimensional turbulence field

An analytical method has been developed to estimate the unsteady aerodynamic forces caused by flow field turbulence on a wind tunnel turning vane cascade system (vane set). This method approximates dynamic lift and drag by linearly perturbing the appropriate steady state force equations, assuming that the dynamic loads are due only to free stream turbulence and that this turbulence is homogeneous, isotropic, and Gaussian. Correlation and unsteady aerodynamic effects are also incorporated into the analytical model. Using these assumptions, equations relating dynamic lift and drag to flow turbulence, mean velocity, and vane set geometry are derived. From these equations, estimates for the power spectra and rms (root mean squared value, delta) loading of both lift and drag can be determined

Immunological studies in chronic inflammatory bowel disease

Imperial Users onl

Local and National Interests in Using Public Forests: Lessons from the Pacific Northwest, Part I: A Time for Scientists and Lawyers

18 pages. Contains references

Bol planes of orders 3434 and 3636

Finite Bol planes of order not $34$ or $36$ are known to be nearfield planes. This article resolves the remaining cases; Finite Bol planes are nearfield

Homology groups of translation planes and flocks of quadratic cones, II; j-planes

The set of j-planes with spreads in PG(3,K), for K a field admitting a quadratic field extension K+ is shown to be equivalent to the set of all det K+-monomial partial flocks of a quadratic cone. Using this connection, when K is GF(2r), the set of j-planes is determined and j = 0, 1, or 2 and correspond to the linear, Walker/Betten or Payne conical flocks, respectively. When K is the field of real numbers, the set of j-planes is completely determined and j is any real number > -&#x00BD