Theoretical studies on the mechanical behavior of granular materials under very low intergranular stresses

The salient aspects of the theoretical modeling of a conventional triaxial test (CTC) of a cohesionless granular medium with stress and strain rate loading are described. Included are a controllable gravitational body force and provision for low confining pressure and/or very low intergranular stress. The modeling includes rational, analytic, and numerical phases, all in various stages of development. The numerical evolutions of theoretical models will be used in final design stages and in the analysis of the experimental data. In this the experimental design stage, it is of special interest to include in the candidate considerations every anomaly found in preliminary terrestrial experimentation. Most of the anomalies will be eliminated by design or enhanced for measurement as the project progresses. The main aspect of design being not the physical apparatus but the type and trajectories of loading elected. The major considerations that have been treated are: appearance and growth of local surface aberrations, stress-power coefficients, strain types, optical strain, radial bead migration, and measures of rotation for the proper stress flux

The development of methods for the early identification of heart disease and related job stresses Progress report, 1 Mar. - 30 Jun. 1969

Methods for early identification of heart disease and related job stresse

Ectoparasites and Other Arthropod Associates of Some Voles and Shrews From the Catskill Mountains of New York

Reported here from the Catskill Mountains of New York are 30 ectoparasites and other associates from 39 smoky shrews, Sorex fumeus, 17 from 11 masked shrews, Sorex cinereus, 11 from eight long-tailed shrews, Sorex dispar, and 31 from 44 rock voles, Microtus chrotorrhinus

Ectoparasites and Other Arthropod Associates of the Hairy-tailed Mole, \u3ci\u3eParascalops Breweri\u3c/i\u3e

A total of 33 taxa of ectoparasites and other associates was taken on seven individuals of the Hairy-tailed Mole, Parascalops breweri, from New York and New England. The most abundant form was the glycyphagid mite, Labidophorus nearcticus

Seabed mobility in the greater Thames estuary

This report presents results from a Caird-Crown Estate research project to investigate the geomorphic history of the seabed and associated features within the greater Thames estuary within a region of over 5000km2 bounded by Aldeburgh (Suffolk), Southend-on-Sea (Essex) and Margate (Kent). Bathymetric charts published over the last 180 years have been analysed to assess the geomorphological evolution of the greater Thames seabed. Charts published since the early 1800s comprise sufficient grid reference or ground control detail for georectification onto a common coordinate system (British National Grid), and a total of 10 charts were used here to reconstruct the historical changes in seabed morphology. Systematic errors in the positioning of offshore features proved only problematic for the earliest chart (1824). Soundings were digitised as points from each chart, and the depth measures at each point were converted to Ordnance Datum. The point data were interpolated onto a regular 100 x 100 m grid (3D surface), which formed the basis of further analysis. The historical evolution of the greater Thames seabed was examined using cross- estuary and shore-normal transects; bathymetric change maps and spatial statistics. The analyses illustrated considerable spatial variability in seabed mobility. Within the central Thames, the banks of Barrows, Sunk Sand, Long Sand and Kentish Knock have experienced significant depth changes associated with lateral shifts. In many cases, the bank surface comprises numerous bathymetric highs that appear to migrate along the banks. Progressive changes can be seen at Long Sand Head, which has been prograding northward over the last 180 years, and Kentish Knock, which has been lengthening and changing shape over this period. The Suffolk shoreface has also experienced some gradual shifts in bank position. Cutler bank has moved seaward, whereas Whiting and Aldeburgh Ridge have moved landward. Bawdsey Bank appears to be extending northward, and the Shipwash has shifted around a central axis, with more recent change in shape. It is not clear whether the offshore banks (Gabbards, Galloper) have moved due to systematic positional errors, but the head and tails of these banks do show evidence of growth and decay