30,724 research outputs found
Continuous consent and dignity in dentistry
Despite the heavy emphasis on consent in the ethical code of the General Dental Council (GDC), it is often overlooked that communication difficulties between patient and dentist can cause problems in maintaining genuine consent during interventions. Inconsistencies in the GDC's Standards for dental professionals and Principles of patient consent guidelines are examined in this article, and it is concluded that more emphasis must be placed on continuous consent as an ongoing process essential to maintaining patients' dignity in dentistry
Unsteady pressure measurements on a biconvex airfoil in a transonic oscillating cascade
Flush-mounted dynamic pressure transducers were installed on the center airfoil of a transonic oscillating cascade to measure the unsteady aerodynamic response as nine airfroils were simultaneously driven to provide 1.2 deg of pitching motion about the midchord. Initial tests were performed at an incidence and angle of 0 deg and A Mach number of 0.65 in order to obtain results in a shock-free compressible flowfield. Subsequent tests were performed at an incidence angle of 7 deg and Mach number of 0.8 in order to observe the surface pressures with an oscillating shock near the leading edge of the airfoil. Results are presented for interblade phase angles of 90 and -90 deg and at blade oscillatory frequencies of 200 and 500 Hz (semi-chord reduced frequencies up to about 0.5 at a Mach number of 0.8). Results from the zero-incidence cascade are compared with a classical unsteady flat-plate analysis. Flow visualization results depicting the shock motion on the airfoils in the high-incidence cascade are discussed. The airfoil pressure data are tabulated
A spectrum of carbon dioxide from 800 to 5500 cm-1
An atlas of CO2 lines obtained from long path length samples at 296 K is presented. Many of the line centers are marked and their positions tabulated
Electrochemical characterization of nonaqueous systems for secondary battery application Quarterly report, Nov. 1967 - Jan. 1968
Multisweep cyclic voltammograms for electrochemical characterization of nonaqueous systems for secondary battery application
Electrochemical characterization of nonaqueous systems for secondary battery application Quarterly report, Feb. - Apr. 1968
Electrochemical characterization of nonaqueous battery systems to determine solubility and reactivity effects on electrode compatibilit
The dynamics of laser droplet generation
We propose an experimental setup allowing for the characterization of laser
droplet generation in terms of the underlying dynamics, primarily showing that
the latter is deterministically chaotic by means of nonlinear time series
analysis methods. In particular, we use a laser pulse to melt the end of a
properly fed vertically placed metal wire. Due to the interplay of surface
tension, gravity force and light-metal interaction, undulating pendant droplets
are formed at the molten end, which eventually completely detach from the wire
as a consequence of their increasing mass. We capture the dynamics of this
process by employing a high-speed infrared camera, thereby indirectly measuring
the temperature of the wire end and the pendant droplets. The time series is
subsequently generated as the mean value over the pixel intensity of every
infrared snapshot. Finally, we employ methods of nonlinear time series analysis
to reconstruct the phase space from the observed variable and test it against
determinism and stationarity. After establishing that the observed laser
droplet generation is a deterministic and dynamically stationary process, we
calculate the spectra of Lyapunov exponents. We obtain a positive largest
Lyapunov exponent and a negative divergence, i.e., sum of all the exponents,
thus indicating that the observed dynamics is deterministically chaotic with an
attractor as solution in the phase space. In addition to characterizing the
dynamics of laser droplet generation, we outline industrial applications of the
process and point out the significance of our findings for future attempts at
mathematical modeling.Comment: 7 two-column pages, 8 figures; accepted for publication in Chaos
[supplementary material available at
http://www.matjazperc.com/chaos/laser.html
The Impact of the Repeal of the Stock-for-Debt Exception on Corporate Bankruptcy Restructurings
This paper investigates the effect repeal of the stock-for-debt exception on corporate bankruptcy restructurings. This exception permitted corporations to exclude cancellation of indebtedness income from gross income provided they exchanged their own common equity for debt while in Chapter 11. Consistent with claims made by Easton (1994), it is found that the change in tax law imposed significant explicit tax costs on bankruptcy filers. Despite these costs, it is found that many of these firms altered their debt restructure method to preserve net operating losses and reduce their cost of equity. Almost half of the sample firms issued significant levels of debt while in Chapter 11. Additionally, approximately a third of these firms responded to the change in tax law to preserve NOLs by electing an alternative provision available under the ownership change rule bankruptcy exception that allows for a one-time reduction in NOL tax attributes. It is also shown that the remaining firms were precluded from changing their debt restructure method, despite the loss of all of their NOL tax attributes, because the financial reporting marginal costs of doing so exceeded any marginal tax benefits that might have been generated
Solid state microwave source development program Final report
Microstrip oscillator for solid state microwave sourc
Experimental and theoretical investigation for the suppression of the plasma arc drop in the thermionic converter
Ion generation and recombination mechanisms in the cesium plasma as they pertain to the advanced mode thermionic energy converter were studied. The decay of highly ionized cesium plasma was studied in the near afterglow to examine the recombination processes. Very low recombination in such a plasma may prove to be of considerable importance in practical converters. The approaches of external cesium generation were vibrationally excited nitrogen as an energy source of ionization of cesium ion, and microwave power as a means of resonant sustenance of the cesium plasma. Experimental data obtained so far show that all three techniques - i.e., the non-LTE high-voltage pulsing, the energy transfer from vibrationally excited diatomic gases, and the external pumping with a microwave resonant cavity - can produce plasmas with their densities significantly higher than the Richardson density. The implication of these findings as related to Lam's theory is discussed
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