Uranium extractants : preparation and use in phosphate system /

"Date Declassified:October 27, 1955."

The action of medicines in the system /

Índice.

Geschichte der philosophie als einleitung in das system der philosophie.

1. Von Thales bis auf die Sophisten -- 2. Sokrates bis Plato

Report of the royal commission on the aged poor : appointed to consider whether any alterations in the system of poor law relief are desirable, in the case of persons whose destitution is occasioned by incapacity for work resulting from old age, or whether assistance could otherwise be afforded in those cases.

Mode of access: Internet.

A theological dictionary, containing definitions of all religious terms; a comprehensive view of every article in the system of divinity; an impartial account of all the principal denominations ... together with an accurate statement of the most remarkable transactions and events recorded in ecclesiastical history.

At head of title: Kay's improved & enlarged edit.

A theological dictionary : containing definitions of all religious terms, a comprehensive view of every article in the system of divinity, an impartial account of all the principal denominations which have subsisted in the religious world, from the birth of the Christ to the present day, together with an accurate statement of the most remarkable transactions and events recorded in ecclesiastical history /

Mode of access: Internet.

Einleitung in das System der christlichen Lehre : oder, Propädeutische Entwicklung der christlichen Lehr-Wissenschaft : ein Versuch /

Mode of access: Internet.

A theological dictionary, containing definitions of all religious terms; a comprehensive view of every article in the system of divinity; an impartial account of all the principal denominations ... together with an accurate statement of the most remarkable transactions and events recorded in ecclesiastical history.

Mode of access: Internet.

The Christian faith personally given in a system of doctrine.

Mode of access: Internet.

Origin of granite in the light of experimental studies in the system : NaAlSi₃O₈=KAlSi₃O₈=Si0₂=H₂O /

Mode of access: Internet.

Federal estate and gift taxes, recommendations for modifications in the system of taxing estates and gifts; report of Committee on federal finance.

Cover-title.

Vestiges of pre-metric weights and measures persisting in metric-system Europe, 1926-1927.

Half-title: Bureau of international research, Harvard university and Radcliffe college.

Address to the clergy of the Dioceses of Dublin and Glandalagh and Kildare : on the recent changes in the system of Irish national education /

Xerox reprint, 1965, by Univ. Microfilms.

An FDTD model for calculation of gradient-induced eddy currents in MRI system

In most magnetic resonance imaging (MRI) systems, pulsed magnetic gradient fields induce eddy currents in the conducting structures of the superconducting magnet. The eddy currents induced in structures within the cryostat are particularly problematic as they are characterized by long time constants by virtue of the low resistivity of the conductors. This paper presents a three-dimensional (3-D) finite-difference time-domain (FDTD) scheme in cylindrical coordinates for eddy-current calculation in conductors. This model is intended to be part of a complete FDTD model of an MRI system including all RF and low-frequency field generating units and electrical models of the patient. The singularity apparent in the governing equations is removed by using a series expansion method and the conductor-air boundary condition is handled using a variant of the surface impedance concept. The numerical difficulty due to the asymmetry of Maxwell equations for low-frequency eddy-current problems is circumvented by taking advantage of the known penetration behavior of the eddy-current fields. A perfectly matched layer absorbing boundary condition in 3-D cylindrical coordinates is also incorporated. The numerical method has been verified against analytical solutions for simple cases. Finally, the algorithm is illustrated by modeling a pulsed field gradient coil system within an MRI magnet system. The results demonstrate that the proposed FDTD scheme can be used to calculate large-scale eddy-current problems in materials with high conductivity at low frequencies.

A reinvestigation of phase equilibria in the system Al2O3-SiO2-ZnO

The phase equilibria and liquidus temperatures in the binary SiO2-ZnO system and in the ternary Al2O3-SiO2-ZnO system at low Al2O3 concentrations have been experimentally determined using the equilibration and quenching technique followed by electron probe X-ray microanalysis. In the SiO2-ZnO system, two binary eutectics involving the congruently melting willemite (Zn2SiO4) were found at 1448 +/- 5 degrees C and 0.52 +/- 0.01 mole fraction ZnO and at 1502 +/- 5 degrees C and 0.71 +/- 0.01 mole fraction ZnO, respectively. The two ternary eutectics involving willemite previously reported in the Al2O3SiO2-ZnO system were found to be at 1315 +/- 5 degrees C and 1425 +/- 25 T, respectively. The compositions of the eutectics are 0.07, 0.52, and 0.41 and 0.05, 0.28, and 0.67 mole fraction Al2O3, SiO2, and ZnO, respectively. The results of the present investigation are significantly different from the results of previous studies.