Now showing items 11-20 of 105
A Hall probe diagnostic for low density plasma accelerators
(The American Institute of Physics, 1998-06)
A Hall probe diagnostic was developed for use with plasma thrusters. The Hall generators were mounted at the end of a stainless steel tube heat exchanger. Ceramic cement and a Pyrex tube were used as radiation and particle ...
Frequency response of multipactor discharge
(The American Institute of Physics, 1998-01)
This paper analyzes the frequency response of a two-surface multipactor in a rf circuit. An equation for the frequency band in which steady state multipactor can occur is derived in terms of the secondary emission properties ...
High speed digital imaging of cavitating vortices
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1998-05)
Researchers at the Cavitation and Multiphase Flow Laboratory of the University of Michigan worked in conjunction with Princeton Scientific Instruments (PSI) engineers to employ a new digital imaging system in the study ...
Nonautonomous Hamiltonians
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1998-10)
We present a theory of resonances for a class of nonautonomous Hamiltonians to treat the structural instability of spatially localized and time-periodic solutions associated with an unperturbed autonomous Hamiltonian. The ...
Use of Kubo formalism to study transport beyond the Born approximation: Application to low-temperature transport in Si metal–oxide–semiconductor field-effect transistors
(The American Institute of Physics, 1998-09-14)
A formalism is developed to study transport in semiconductor devices under conditions where the Born approximation and independent scattering approximations break down. The approach based on the Kubo formalism is applied ...
Investigation of Virgin Coals and Coals Subjected to a Mild Acid Treatment
(Kluwer Academic Publishers; Springer Science+Business Media, 1998-03)
A quantitative determination of the relative marcasite/pyrite contents in virgin coals is possible by means of 57 Fe Mössbauer spectroscopy. Complications arise, however, when iron-containing silicates, carbonates, or other ...
Extendability of Solutions of the Einstein–Yang/Mills Equations
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1998-06)
We prove that any solution to the spherically symmetric SU (2) Einstein–Yang/Millsequations that is defined in the far field and is asymptotically flat, is globally defined. This result applies in particular to the interior ...
Misfit effects in adhesion calculations
(IOP Publishing Ltd, 1998-03-01)
The work of adhesion of bimaterial interfaces is commonly computed using quantum mechanical methods in which the two materials are strained into coherency. There is no relaxation of the coherency by the formation of an ...
Advanced imaging microscope tools applied to microgravity research investigations
(The American Institute of Physics, 1998-01-15)
The inability to observe and interact with experiments on orbit has been an impediment for both basic research and commercial ventures using the shuttle. In order to open the frontiers of space, the Center for Microgravity ...
Constructive role of noise: Fast fluctuation asymptotics of transport in stochastic ratchets
(The American Institute of Physics, 1998-09)
The constructive role of random fluctuations is studied in the context of transport in stochastic ratchets. We discuss the interplay of independent white (thermal) and discrete (external) noises and their generation of ...