The Road Not Taken: John Brown Francis and the Dorr Rebellion

In this contextualizing essay, Dr. Erik J. Chaput and Russell DeSimone examine historical opposing views to Providence attorney Thomas Wilson Dorr and his attempt to reform the state\u27s archaic governing structure in the spring of 1842. Chief among these views is that of former Governor John Brown Francis, who urged both sides to find a compromise with each other. The essay, along with a collection of letters it accompanies on our Dorr Rebellion Letters project site, elucidates how the moderate faction within the Law and Order party; had this moderate voice been heeded Rhode Island’s Dorr Rebellion would have turned out quite differently and that there were alternative approaches that politicians might have taken. The Dorr Rebellion Project http://library.providence.edu/dorr The Dorr Letters Project http://library.providence.edu:8080/xtf/index.htm

The Road to Rebellion

In this essay, Dr. Erik J. Chaput and Russell DeSimone examine and contextualize the events surrounding the Dorr Rebellion of 1842 and the consequences that followed for those involved, primarily Providence attorney Thomas Wilson Dorr, who was the figurehead of one of the most significant constitutional reform efforts in antebellum American history. This essay, along with a collection of letters it accompanies on our Dorr Rebellion Letters project site, examines the momentous importance of the rebellion in terms of local Rhode Island history and national constitutional reform. The Dorr Rebellion Project http://library.providence.edu/dorr The Dorr Letters Project http://library.providence.edu:8080/xtf/index.htm

Dorr Rebellion Project Selected Bibliography

An annotated and traditional bibliography of research materials utilized by Dr. Erik J. Chaput and Rhode Island scholar Russell J. DeSimone in creating the script for The Dorr Rebellion short-form documentary and other resources on the Dorr Rebellion Project website. For those resources which are open access, an access link has been provided within the document. Visit the Dorr Rebellion Project website for more information: http://library.providence.edu/dorr

Prison Correspondence

This overview essay by SCE Professor Erik J. Chaput provides context for the drafting of the letters from Dorr to his mother Lydia. The essay provides a brief description of Dorr\u27s treason trial, his sentencing and the nature of his imprisonment in the state prison on the Providence cove. The Dorr Rebellion Project http://library.providence.edu/dorr The Dorr Letters Project http://library.providence.edu:8080/xtf/index.htm

Near-congruent solidification of castings

A study on the microstructure development of as-cast Cu-Mn alloys based around the congruent minimum at 34.6 wt % Mn and 873 °C was performed. Initially, this was to evaluate the alloy as an alternative to wide freezing range Pb and Sn bronzes that are plagued with porosity. The shallow minimum and associated narrow freezing ranges around the congruent point result in a completely cellular (non-dendritic) solidification morphology for a composition range ~3 wt % Mn about the congruent composition (C c). The degree of cellular solidification was found to depend on the mold material. Increased mold conductivity lead to a narrower composition range of complete cellular solidification. By casting alloys of different compositions into a composite mold, the effect of the mold conductivity allowed an evaluation of the congruent point reported by Gokcen. These results fit well with the constitutional supercooling criterion. While solidification at a point ideally would be planar, this was not observed even with minor deviations from the Cc. An additional study of the microstructure development along the minimum trough in the liquidus surface between the Cu-Mn and Ni-Mn binary congruent points of the Cu-Mn-Ni ternary system was conducted. This study revealed that alloys near the binary congruent minima were more cellular than alloys near the middle of the phase diagram, along the trough. As the composition approached the center of the Cu-Mn-Ni diagram, the morphology became more dendritic, characteristic of an isomorphous system. Even though these alloys did not solidify in a completely cellular manner, they were free of any microshrinkage porosity. The alloys in this study (Cu-Mn and Cu-Mn-Ni) show promise for use in structural applications due to the lack of microshrinkage porosity, potent solution strengthening of manganese and strong aging response

A new experimental procedure for characterizing quantum effects in small magnetic particle systems

A new experimental procedure is discussed, which aims at separating thermal from quantum behavior independently of the energy barrier distribution in small particle systems. Magnetization relaxation data measured between 60 mK and 5 K on a sample of nanoparticles is presented. The comparison between experimental data and numerical calculations shows a clear departure from thermal dynamics for our sample, which was not obvious without using the new procedure presented here.Comment: LaTeX source, 6 pages, 5 PostScript figure

Non-monotonic field-dependence of the ZFC magnetization peak in some systems of magnetic nanoparticles

We have performed magnetic measurements on a diluted system of gamma-Fe2O3 nanoparticles (~7nm), and on a ferritin sample. In both cases, the ZFC-peak presents a non-monotonic field dependence, as has already been reported in some experiments,and discussed as a possible evidence of resonant tunneling. Within simple assumptions, we derive expressions for the magnetization obtained in the usual ZFC, FC, TRM procedures. We point out that the ZFC-peak position is extremely sensitive to the width of the particle size distribution, and give some numerical estimates of this effect. We propose to combine the FC magnetization with a modified TRM measurement, a procedure which allows a more direct access to the barrier distribution in a field. The typical barrier values which are obtained with this method show a monotonic decrease for increasing fields, as expected from the simple effect of anisotropy barrier lowering, in contrast with the ZFC results. From our measurements on gamma-Fe2O3 particles, we show that the width of the effective barrier distribution is slightly increasing with the field, an effect which is sufficient for causing the observed initial increase of the ZFC-peak temperatures.Comment: LaTeX file 19 pages, 9 postscript figures. To appear in Phys. Rev. B (tentative schedule: Dec.97