6,300 research outputs found
What is happening to the U.S. dollar?
Excerpts from an address at the meeting of the International Trade Club of Chicago, February 9, 1978
The economy and the banking system
Excerpt from a speech made to the Assembly for Bank Directors, Harbour Castle, Toronto, Canada, June 7, 1979
Stability of switched linear differential systems
We study the stability of switched systems where the dynamic modes are
described by systems of higher-order linear differential equations not
necessarily sharing the same state space. Concatenability of trajectories at
the switching instants is specified by gluing conditions, i.e. algebraic
conditions on the trajectories and their derivatives at the switching instant.
We provide sufficient conditions for stability based on LMIs for systems with
general gluing conditions. We also analyse the role of positive-realness in
providing sufficient polynomial-algebraic conditions for stability of two-modes
switched systems with special gluing conditions
Assessment of the potential of solar thermal small power systems in small utilities
The potential economic benefit of small solar thermal electric power systems to small municipal and rural electric utilities is assessed. Five different solar thermal small power system configurations were considered in three different solar thermal technologies. The configurations included: (1) 1 MW, 2 MW, and 10 MW parabolic dish concentrators with a 15 kW heat engine mounted at the focal point of each dish, these systems utilized advanced battery energy storage; (2) a 10 MW system with variable slat concentrators and central steam Rankine energy conversion, this system utilized sensible thermal energy storage; and (3) a 50 MW central receiver system consisting of a field of heliostats concentrating energy on a tower-mounted receiver and a central steam Rankine conversion system, this system also utilized sensible thermal storage. The results are summarized in terms of break-even capital costs. The break-even capital cost was defined as the solar thermal plant capital cost which would have to be achieved in order for the solar thermal plants to penetrate 10 percent of the reference small utility generation mix by the year 2000. The calculated break-even capital costs are presented
Nuclear design and experiments for a space power reactor
Design and experiments with compact fast spectrum reactor for generating electric power in spac
Utilizing the bank holding company
Excerpts from a speech to the Assembly for Bank Directors, Southhampton Princess, Bermuda, May 26, 1980
Comparison of Measured Flapwise Structural Bending Moments on a Teetering Rotor Blade With Results Calculated From the Measured Pressure Distribution
Flapwise bending moments were calculated for a teetering rotor blade using a reasonably rapid theoretical method in which airloads obtained from wind-tunnel tests were employed. The calculated moments agreed reasonably well with those measured with strain gages under the same test conditions. The range of the tests included one hovering and two forward-flight conditions. The rotor speed for the test was very near blade resonance, and difficult-to-calculate resonance effects apparently were responsible for the largest differences between the calculated and measured harmonic components of blade bending moments. These differences, moreover, were largely nullified when the harmonic components were combined to give a comparison of the calculated and measured blade total- moment time histories. The degree of agreement shown is therefore considered adequate to warrant the use of the theoretical method in establishing and applying methods of prediction of rotor-blade fatigue loads. At the same time, the validity of the experimental methods of obtaining both airload and blade stress measurement is also indicated to be adequate for use in establishing improved methods for prediction of rotor-blade fatigue loads during the design stage. The blade stiffnesses and natural frequencies were measured and found to be in close agreement with calculated values; however, for a condition of blade resonance the use of the experimental stiffness values resulted in better agreement between calculated and measured blade stresses
Spectroscopic study of unique line broadening and inversion in low-pressure microwave generated water plasmas
It was demonstrated that low pressure (~0.2 Torr) water vapor plasmas
generated in a 10 mm inner diameter quartz tube with an Evenson microwave
cavity show at least two features which are not explained by conventional
plasma models. First, significant (> 0.25 nm) hydrogen Balmer_ line broadening,
of constant width, up to 5 cm from the microwave coupler was recorded. Only
hydrogen, and not oxygen, showed significant line broadening. This feature,
observed previously in hydrogen-containing mixed gas plasmas generated with
high voltage dc and rf discharges was explained by some researchers to result
from acceleration of hydrogen ions near the cathode. This explanation cannot
apply to the line broadening observed in the (electrodeless) microwave plasmas
generated in this work, particularly at distances as great as 5 cm from the
microwave coupler. Second, inversion of the line intensities of both the Lyman
and Balmer series, again, at distances up to 5 cm from the coupler, were
observed. The line inversion suggests the existence of a hitherto unknown
source of pumping of the optical power in plasmas. Finally, it is notable that
other aspects of the plasma including the OH* rotational temperature and low
electron concentrations are quite typical of plasmas of this type.Comment: 27 pages, 7 figure
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