Development of protective coatings for tantalum T-22 alloy Final summary report

Oxidation resistance tests of protective coatings for tantalum allo

Electrophoretic deposition of gradated oxidation resistant coatings on tantalum-10 tungsten alloy

Material selection and electrophoretic deposition studies of high temperature oxidation resistant coatings on tantalum-10 tungsten allo

Development of oxidation resistant coatings for use above 3500 deg F

Physical property evaluation of oxidation resistant coating materials for high temperature protection of tantalum-base alloy

Optimization and evaluation of electrophoretic protective coatings for tantalum T-222 alloy Final summary report, 1 Jul. 1966 - 27 Oct. 1967

Protective coating parameters for improving oxidation resistance and reliability of silicide coating systems for tantalum alloy

Relativistic photoelectron spectra in the ionization of atoms by elliptically polarized light

Relativistic tunnel ionization of atoms by intense, elliptically polarized light is considered. The relativistic version of the Landau-Dykhne formula is employed. The general analytical expression is obtained for the relativistic photoelectron spectra. The most probable angle of electron emission, the angular distribution near this angle, the position of the maximum and the width of the energy spectrum are calculated. In the weak field limit we obtain the familiar non-relativistic results. For the case of circular polarization our analytical results are in agreement with recent derivations of Krainov [V.P. Krainov, J. Phys. B, {\bf 32}, 1607 (1999)].Comment: 8 pages, 2 figures, accepted for publication in Journal of Physics

Relativistic semiclassical approach in strong-field nonlinear photoionization

Nonlinear relativistic ionization phenomena induced by a strong laser radiation with elliptically polarization are considered. The starting point is the classical relativistic action for a free electron moving in the electromagnetic field created by a strong laser beam. The application of the relativistic action to the classical barrier-suppression ionization is briefly discussed. Further the relativistic version of the Landau-Dykhne formula is employed to consider the semiclassical sub-barrier ionization. Simple analytical expressions have been found for: (i) the rates of the strong-field nonlinear ionization including relativistic initial and final state effects; (ii) the most probable value of the components of the photoelectron final state momentum; (iii) the most probable direction of photoelectron emission and (iv) the distribution of the photoelectron momentum near its maximum value.Comment: 13 pages, 3 figures, to be published in Phys. Rev.

Program in Comparative Study of Social Transformations

Also CSST Working Paper #1.http://deepblue.lib.umich.edu/bitstream/2027.42/51112/1/344.pd

Transport von Dieselruß durch Wasser in gestörten und ungestörten Böden - Resultierende, kleinskalige Verteilung und Nachweismethoden

Durch den Diesel-Kfz-Verkehr gelangen jährlich ca. 1,8 g Ruß/km in straßennahe Böden. Ruß enthält hohe Gehalte an PAK und ist aufgrund seiner Sorptionseigenschaften gleichzeitig Senke für weitere hydrophobe Schadstoffe. Es ist daher zu vermuten, dass derartige Schadstoffe prioritär mit dem Ruß transportiert werden. Zur Verlagerung bzw. Retention von Ruß in Böden liegen jedoch kaum Informationen vor. Ziel dieser Arbeit war es daher, den Transport von Ruß in aggregierten bzw. homogenisierten Böden unterschiedlichen Stoffbestandes mit Hilfe von Säulenperkolationsexperimenten zu bestimmen. Zur Ermittlung des Durchbruchs bzw. der Retention des Rußes wurden DOC und DON im Perkolat sowie PAK-Gehalte in unterschiedlichen Bodentiefen bestimmt. Die resultierende räumliche Verteilung des Rußes in den Bodensäulen und Porenräumen wurde mittels bildgebender Verfahren untersucht. Dies erfolgte zum einem unter Verwendung einer Hyperspektralkamera (Neo HySpex VNIR-1600) und Maximum Likelihood Classification (MLC) sowie autoPartial Least Squares Regression (aPLSR) als Auswertungsmethoden. Die Identifizierung des Rußes erfolgte durch konfokale Raman-Imaging Mikroskopie. Die Ergebnisse zeigen, dass Ruß vorrangig an der Bodenoberfläche ausgefiltert wird, wo er potentiell einem Abtrag durch runoff, Auswehung, etc. unterliegt. Eine Tiefenverlagerung erfolgt über Makroporenräume als präferentielle Fließwege

Quasi-classical Molecular Dynamics Simulations of the Electron Gas: Dynamic properties

Results of quasi-classical molecular dynamics simulations of the quantum electron gas are reported. Quantum effects corresponding to the Pauli and the Heisenberg principle are modeled by an effective momentum-dependent Hamiltonian. The velocity autocorrelation functions and the dynamic structure factors have been computed. A comparison with theoretical predictions was performed.Comment: 8 figure

On the variational limits of lattice energies on prestrained elastic bodies

We study the asymptotic behaviour of the discrete elastic energies in presence of the prestrain metric $G$, assigned on the continuum reference configuration $\Omega$. When the mesh size of the discrete lattice in $\Omega$ goes to zero, we obtain the variational bounds on the limiting (in the sense of $\Gamma$-limit) energy. In case of the nearest-neighbour and next-to-nearest-neibghour interactions, we derive a precise asymptotic formula, and compare it with the non-Euclidean model energy relative to $G$