An optical method for determining level in two-phase cryogenic fluids

A method was evaluated to measure the liquid-gas and the liquid-slush interfaces in two-phase cryogen systems using optical means. This method makes use of the attenuation of a directed light beam caused by the difference in the index of refraction between the solid particles and the surrounding liquid. Preliminary experimental results obtained in slush nitrogen are shown. The possibility of extending this technique to include a measure of solid fraction is also discussed

Maine public lands 1781-1795, claims, trespassers, and sales

Thesis (Ph.D.)--Boston UniversityIn 1781 the General Court of the new State of Massachusetts launched a program for the administration of its unappropriated land in the District of Maine, a program which encompassed three main phases: the clarification of pre-Revolutionary claims, the quieting of squatters, and the sale of the land that still belonged to the Commonwealth. Fourteen years later it ended a period by ordering the Land Committee which had been appointed in 1783 to stop selling those lands. During this period the Legislature and the Committees it appointed made significant progress in each of these fields. Despite the fact that the Province Government had devised a particularly efficient land grant system, 1781 found claims in Maine confused - authorities which controlled the area before Massachusetts bought it had not always handled these grants well, and Massachusetts itself had not followed its own system closely immediately before the Revolution. The Land Committees and the General Court settled some claim disputes during this period, but some remained to be resolved in later years. A 1791 act, not tested thoroughly before the period ended, established a method of restoring improperly claimed land to the State. [TRUNCATED

On being there

ON BEING THERE is the physical embodiment of an emotional experience. The works are responses to stories told and memories of my two grandfathers, being made of images from their possessions and sketchbooks. The object was to explore the experience of loss and to create a record of that experience. The work is an investigation of the self through the history of my grandfathers’ lives and experiences told in the media of printmaking

Substituted triphenyl tetrazolium chlorides

The work in this thesis is a continuation of a project started at the University of Richmond in 1952 by A. G. Richardson under the directorship of Dr. J. S. Pierce and Dr. George z.Williams, Director of Clinical Pathology, National Institutes of Health, Bethesda, Maryland. The purpose of the research was to prepare triphenyl tetrazolium salts, substituted, particularly in the ortho and para positions, with various electron accepting and electron donating groups. It was hoped that these substitutions would impart enough differences in the properties of the compounds so as to allow d etection of certain biological reactions. The tetrazolium salts were sent to Dr. Williams for testing as soon as they were prepared. Time has not permitted the biological testing of the com­ pounds prepared in this work to be completed. However, a number of the salts, as well as those prepared by Richardson have been tested in Dr. Williams\u27 laboratories. The substitutions which have been used were chosen from a number of groups which varied with respect to their electron donating and electron accepting power. The list as given in Fuson\u27s Advanced Organic Chemistry was used as a guide. The groups listed in order of decreasing nucleophylic power are as follows: -NH2, -OH, -OCH3, + -CH3, -H, -C6H5, - COCH3 , -No2, and -N(CH3)3 (8s). Piperonal, because of availability and electron donating power, was used to give a 3,4-methylenedioxy substitution on the phenyl group in position 5 of the tetrazolium molecule

History games for secondary schools

Thesis (Ed.M.)--Boston University, 1947. This item was digitized by the Internet Archive

An analysis of teen-age programs in the South End, Boston, Massachusetts 1946-1947

Thesis (M.S.)--Boston University, 1947. This item was digitized by the Internet Archive