The constitution of starch : a study of the methyl, acetyl, and benzoyl derivatives of starch

The field of the Chemistry of Starch is so wide and the complexities involved are so great that any attempt to solve the problems of the constitution of starch cannot be spread over the whole front, but must necessarily be confined to a few chosen points of attack. The following introduction, therefore, is not presented as a complete survey of literature of the subject but merely as a resumé of those parts bearing immediately on the topics studies, with special reference to the work of Dr. J. K. Rutherford, inasmuch as the present thesis is a continuation and amplification of her work

Alien Registration- Anderson, Walter R. (Portland, Cumberland County)

https://digitalmaine.com/alien_docs/23818/thumbnail.jp

Amplitude vs. Offset Effects on Gas Hydrates at Woolsey Mound, Gulf of Mexico

Due to the estimated massive quantities of natural methane hydrates, they represent one of the largest sources of future alternative energy on Earth. Methane hydrates have been found in the shallow sub-seafloor of the Northern Gulf of Mexico where the water depth is in excess of ~900 m. Mississippi Canyon Block 118 has been chosen by the Gulf of Mexico Hydrates Research Consortium to be the site of a multi-sensor, multi-discipline sea-floor observatory for gas hydrate research. First evidence for gas hydrates at MC 118 was observed at Woolsey Mound. Subsurface evidence for gas hydrates has subsequently been substantiated by 3D seismic reflection data and piston coring. It is estimated that methane trapped within gas hydrates worldwide may exceed 1016 kg, one of the largest sources of hydrocarbons to date, and here they present an opportunity for exploitation via harvesting for energy production. The analysis of the 3-D seismic reflection data and integration with industry well logs reveals the subsurface structural and stratigraphic architecture of a thermogenic hydrate system in the Mississippi Canyon area (MC-118) of the Gulf of Mexico. Like many hydrocarbon systems in the Gulf of Mexico, Woolsey Mound is dominated by the presence and sporadic movement of allochthonous salt within the sedimentary section. Exploration-scale 3-D seismic imaging shows a network of faults connecting the mound to a salt diapir and an extended area of high P-wave velocity just beneath the sea floor. Gas hydrates exhibit clear seismic properties such as the bottom simulating reflector (BSR), relatively high P- and S- wave velocities, seismic blanking, and amplitude vs. offset (AVO) effects. These effects occur mainly due to the presence of free gas that is usually trapped by the more rigid overlying hydrate formations. In order to substantiate the presence of hydrates in the shallow subsurface at Woolsey Mound, an AVO analysis based on the variation of the P-wave reflection coefficient with the angle of incidence was performed on a seismic transect across the mound. The AVO analysis targeted a shallow (~150 m below the seafloor) \u27bright spot\u27 that is interpreted to mark the base of the gas hydrate stability field. The AVO analysis shows results consistent with evidence for free gas underlying a medium with higher P-wave and S-wave velocities such as gas hydrates. This shallow, high-velocity zone, pore-fluid analyses revealing microbial processes, thermobaric and AVO analysis provide convincing evidence for the existence of gas hydrates at MC 118

The Maine Shore and the Army Corps: A Tale of Two Harbors, Wells and Saco, Maine

By discussing the problems of beach erosion and sand movement at Wells and Saco, Maine, Joseph Kelley and Walter Anderson demonstrate how single-minded, engineering approaches to complex, interdisciplinary coastal issues can create bigger problems than previously existed. As Kelley and Anderson explain, at both Wells and Camp Ellis, the Army Corps of Engineers was brought in to construct a harbor at no local cost to the community. This was accomplished by constructing jetties, and the result has been a persistent and serious problem of beach erosion. Over the years, the Army Corps has offered further technical solutions that have served only to exacerbate the problem. In pointing out the shortcomings of these solutions, Kelley and Anderson call for new action requiring federal, state, and local involvement. To do nothing, they argue, is to absorb the costs of letting nature run its course

Mott--Hubbard and Anderson Transitions in Dynamical Mean--Field Theory

The Anderson--Hubbard Hamiltonian at half--filling is investigated within dynamical mean--field theory at zero temperature. The local density of states is calculated by taking the geometric and arithmetic mean, respectively. The non--magnetic ground state phase diagrams obtained within the different averaging schemes are compared.Comment: 2 pages, 2 figures, SCES2004 contributio