Measurement of the line width parameters of a molecule is of interest because collision diameters can be calculated from them. This gives an effective size of the molecule when it is involved in interactions with other molecules. Further, specific types of interactions can be inferred from detailed information about the dependence of the line width upon pressure. In this paper, an experiment for measuring line width parameters for methyl cyanide is described and the results of the experiment are analyzed. This investigation was successful in obtaining precise values for the line width parameter for the J-J' = 0-1, J-J'= 1-2, and J-J' = 2-3 transitions of methyl cyanide which agree with experimental values of other researchers where available. It was found that standing waves were the dominant effect in the measurement of center frequency shift.

Born into one of the most distinguished families in eighteenth-century England, Samuel Wesley (1766-1837) distinguished himself as a child prodigy, an ardent devotee of the music of J. S. Bach, and as a composer, performer and music lecturer. His four extant overtures, written from the year 1778 to 1824, offer an insight into his development as a composer. This edition, drawn from the Wesley manuscripts housed in the British Library, is preceded by a commentary dealing with Wesley's life, the history of the overture as an independent for, and with Wesley's place in the history of English instrumental music.

Thin target L-Shell x-ray production cross sections for protons incident on ₆₂Sm and ₇₀Yb in the energy range of 0.3 to 2.4 MeV/amu, alpha particles incident on ₆₂Sm, ₇₀Yb, and ₈₂Pb in the energy range of 0.15 to 4.8 MeV/amu, and lithium ions incident on ₅₈Ce, ₆₀Nd, ₆₂Sm, ₆₆Dy, ₆₇Ho, ₇₀Yb, and ₈₂Pb in the energy range of 0.8 to 4.4 MeV/amu have been measured. The cross section data have been compared to the planewave Born approximation (PWBA) and the PWBA modified to include binding energy and Coulomb deflection effects. The Lα₁,₂ x-ray production cross sections are best represented by the PWBA modified to include both the binding energy and Coulomb deflection effects (PWBA-BC) over the entire incident ion, incident energy, and target ranges studied. However, the Lγ₁ and Lγ₂,₃,₍₆₎ x-ray production cross sections are best represented by the PWBA except at the lower ion energies, where both the PWBA and PWBA-BC are in disagreement with the data. The comparison of Lα₁,₂/Lγ₂,₃,₍₆₎ ratios to theory reveals that the PWBA-BC does not predict the inflection point substantiated by the data, and the agreement between the data and the PWBA-BC becomes worse as the atomic number of the incident ion increases. Comparison …

The problem of this study is the effect of two training models on personnel who teach moderately and severely retarded children. The subjects of this study were sixty-two staff members who work with the moderately and severely retarded pupils in two large metropolitan school systems. Eighteen teachers, eighteen aides, and twenty-six volunteers participated in the study. Two observation instruments administered by trained observers were used as pre- and post-tests to measure the trainees' competencies in applying operant conditioning techniques in both group and one-to-one instructional situations. The purposes of this study were (1) to compare the effectiveness of an experiential model and a didactic model in preparing personnel to deliver cues and reinforcers when working with moderately and severely retarded children; (2) to compare the costs of equipment and supervisory personnel; and (3) to examine the relationship between the trainees' effectiveness of delivering cues and reinforcers to a group of moderately and severely retarded youngsters and the on-task behavior of those students. This report concludes that the trainees' self-evaluation of the training models indicated that they prefer simulated techniques and feedback, which denotes that the Experiential Model may foster certain kinds of incidental learning such as physical mannerisms and visual …