Amateur fruit growing. A practical guide to the growing of fruit for home use and the market. Written with special reference to colder climates.

Mode of access: Internet.

Divided skates.

Mode of access: Internet.

A sunny little lass.

Mode of access: Internet.

Pittsburgh : its commerce & industries, & the natural gas interest. /

Mode of access: Internet.

Lord Milner and South Africa;

Mode of access: Internet.

1952 University of Michigan Football Team

View of Old Engineering Building from the South East

Originally one of four buildings on campus. Used as professor's house 1840-1877 (S. University where Clements Library stands). Used as Dental College 1877-1891; wing added on East 1891. In 1891, building enlarged to north and third story added. Entrance changed to West facade. Used by Engineering until 1922 when it was removed. After 1904, it was called the Old Engineering Building.

A geography of Pennsylvania; containing an account of the history, geographical features, soil, climate ...

Mode of access: Internet.

Mitteilungen der Naturforschenden Gesellschaft in Bern.

GeoRef

The relations of geography & history,

Mode of access: Internet.

Studies of the effects of molecular encounters on N.M.R. spin-lattice relaxation times

This thesis is concerned with investigations of the effects of molecular encounters on nuclear magnetic resonance spin-lattice relaxation times, with particular reference to mesitylene in mixtures with cyclohexane and TMS. The purpose of the work was to establish the best theoretical description of T1 and assess whether a recently identified mechanism (buffeting), that influences n.m.r. chemical shifts, governs Tl also. A set of experimental conditions are presented that allow reliable measurements of Tl and the N. O. E. for 1H and 13C using both C. W. and F.T. n.m.r. spectroscopy. Literature data for benzene, cyclohexane and chlorobenzene diluted by CC14 and CS2 are used to show that the Hill theory affords the best estimation of their correlation times but appears to be mass dependent. Evaluation of the T1 of the mesitylene protons indicates that a combined Hill-Bloembergen-Purcell-Pound model gives an accurate estimation of T1; subsequently this was shown to be due to cancellation of errors in the calculated intra and intemolecular components. Three experimental methods for the separation of the intra and intermolecular relaxation times are described. The relaxation times of the 13C proton satellite of neat bezene, 1,4 dioxane and mesitylene were measured. Theoretical analyses of the data allow the calculation of Tl intra. Studies of intermolecular NOE's were found to afford a general method of separating observed T1's into their intra and intermolecular components. The aryl 1H and corresponding 13C T1 values and the NOE for the ring carbon of mesitylene in CC14 and C6H12-TMS have been used in combination to determine T1intra and T1inter. The Hill and B.P.P. models are shown to predict similarly inaccurate values for T1linter. A buffeting contribution to T1inter is proposed which when applied to the BPP model and to the Gutowsky-Woessner expression for T1inter gives an inaccuracy of 12% and 6% respectively with respect to theexperimentally based T1inter.