Most Popular Books by Thomas Armstrong

Knowledge of the spectrum of the wavefront phase fluctuations caused by atmospheric seeing is essential to the design of the next generation of optical interferometers, but little empirical data exists. The authors report measurements of power spectra of the white-light fringe motion in the Mk III interferometer under a wide variety of conditions. Most of the temporal power spectra agree with those predicted from the standard Tatarski theory with a large (several km) outer scale, but data obtained with rapid switching of baselines indicate an outer scale of order 30 meters. The authors discuss how these results can be reconciled.

Letter from Ebenezer Dumont to his commander, T.A. Morris, dated Laurel Hill, 15 July, 1861, giving an official report of the part played by his regiment at the battle of Corrick's Ford, on the Cheat River in West Virginia. He pays tribute to the courage of his own men and that of the Confederate commander whose death he witnessed, presumably Robert S. Garnett.

The Little Blue Bird leaves its nest for the first time, getting lost and caught in the rain. With the help of Love Bird, Wise Bird and Silly Bird, The Little Blue Bird returns safely to its nest. The next morning there are lot's of worms because of all the rain. The Little Blue Bird helps introduce young ones to emotions that can be difficult to work through. We see with a little love, wisdom and a silly sense of humor, good things can come out of difficult challenges. This is the first book in a series that will encourage children to learn about the different kinds of emotions and early concepts of coping, healthy boundaries and self awareness.

This is an interactive book for parents and children to record memories of their pet that recently passed away.

The least squares estimator of the autoregressive parameter, LS((gamma)), in a first-order stochastic difference equation with independent, identically distributed random innovations is known to be asymptotically unbiased, efficient and consistent (as T ( -->) (INFIN) or (sigma) ( -->) 0) under the proper model specification. Further, LS((gamma)) has a limiting normal distribution around the true parameter, (gamma), if the random innovations are drawn from a normal population. These properties are not observed, however, in sample sizes that are typical of economic time series.