Apparatus for measuring a sorbate dispersed in a fluid stream

A sensitive, miniature apparatus was designed for measuring low concentrations of a sorbate dispersed in a fluid stream. The device consists of an elongated body having a surface capable of sorbing an amount of the sorbate proportional to the concentration in the fluid stream and propagating acoustic energy along its length. The acoustic energy is converted to an electrical output signal corresponding to the concentration of sorbate in the fluid stream. The device can be designed to exhibit high sensitivity to extremely small amounts of sorbate dispersed in a fluid stream and to exhibit low sensitivity to large amounts of sorbate. Another advantage is that the apparatus may be formed in a microminiature size and at a low cost using bath microfabrication technology

The effect of bending on the stresses in adhesive joints

The problem of stress distribution in adhesive joints where two orthotropic plates are bonded through a flexible adhesive layer is analyzed. It is shown that the effect of bending of the adherends on the stresses in the adhesive layer is very significant. The transverse shear deformations of the adherends appear to have little influence on the adhesive layer stresses. The maximum transverse normal stress in the adhesive is shown to be larger than the maximum longitudinal shear stress. The method of solution is applied to several examples of specific joint geometries and material combinations, and is proven to be applicable to other related problems

Stress analysis of adhesive bonded stiffener plates and double joints

The general problem of adhesive bonded stiffener plates and double joints of dissimilar orthotropic adherends with transverse shear deformations are analyzed. Adhesive layers are assumed to be of an isotropic, elastic and relatively flexible material. It is shown that the stress distributions in the adhesive layers are very much dependent on the bending deformations in adherends. Also, it is found that, in the adhesive layer, maximum transverse normal stress is, in many cases, larger than the longitudinal shear stress and that both occur at the edge of the joint. The general method of solution developed is applied to several practical examples

Gamma Ray Bursts as Probes of Dust in the Evolving Universe

Dust is ubiquitous in the universe. Understanding where it comes from and where we observe it can have major implications to all astronomical observations. In this study, we investigate how gamma ray bursts (GRBs) can be used as probes of dust in the evolving universe. Making the simplification that silicate dust comes from core collapse supernovae and that graphite dust is produced in the winds of low- to intermediate-mass stars, we present numerical simulations of the resulting dust evolution in GRB hosts and show how the SEDs evolve. Dust extinction laws are re-derived from scattering theory of small particles and the dependence of the extinction laws on varying dust properties are explored. Finally, we compare the predictions of our simulations of dust evolution and our modeled extinction laws to 82 GRB SEDs spanning the last 13 years. We measure the column densities of graphite and silicate along the line of sight to these GRBs as well as the overall visual extinction AV in the co-moving frame and the dust-to-gas ratios. We find no clear evolutionary trend with respect to the AV values or the graphite-to-silicate ratio as a function of redshift. However, we do detect more silicate than graphite in nearly every burst, implying high production rates of silicate in core-collapse supernovae, and we discover a graphite component previously undetected in 14 GRBs in our sample. These results are examined in the context of our evolutionary models, and we discuss the implications for star formation in the early universe

The Counsellor

JOHN UPDIKE of Georgetown, Massachusetts is one of the most widely translated of contemporary American writers. His recent books are The Coup and Problems, and he is currently completing a New England novel

Metriplectic Heavy Top: An Example of Geometrical Dissipation

Recently, Morrison and Updike showed that many dissipative systems are naturally described as possessing a Riemann curvature-like bracket, which similar to the Poisson bracket, generates the dissipative equations of motion once suitable generators are chosen. In this paper, we use geometry to construct and explore the dynamics of these new brackets. Specifically, we consider the dynamics of a heavy top with dissipation imposed by a Euclidian contravariant curvature. We find that the equations of motion, despite their rather formal motivation, naturally generalize the energy-conserving dissipation considered by Matterasi and Morrison. In particular, with suitable initial conditions, we find that the geometrically motivated equations of motion cause the top to relax to rotation about a principal axis.Comment: Bachelor Thesi

06.01.004 Lesley College Publications, Yearbooks, 1924-2008

Formerly called The Lesleyan, this collection consists of yearbooks published annually by Lesley College for the graduating classes between the years 1924 to 2008. The yearbooks contain photographs of students, staff, faculty and organizations, providing a valuable historical view of Lesley University throughout the years. The yearbook was not published in 2007 and 2009-present. Yearbooks are also accessible online at the following site: http://digitalcommons.lesley.edu/yearbooks/ Yearbooks for 1925, 1927, and 1943 are available in the Archives in digital format only; Physical copies of these editions may be found at the Lesley University Office of Advancement

In the Cemetery High Above Shillington

John Updike\u27s Collected Poems 1953-1993 was published by Knopf last spring. His most recent novel is Brazil. A frequent OR contributor, he lives in Beverly Farms, Massachusetts

12.001 Lesley University Alumni Donations, 1896-1987

This collection consists of alumni donations to the Lesley University Archives. Donations may include, but are not limited to; personal correspondence, school records, scrapbooks, artifacts, photographs and published works relating to Lesley University and student experiences at Lesley. Published works have been removed to specific collections within the archives, with a photocopy of the front page of the work remaining within the Alumni Donation collection