Chemical kinetics at very high pressures. 2. A new method of distinguishing between SN1 and SN2 solvolyses

1988 ◽  
Vol 92 (12) ◽  
pp. 3417-3421 ◽  
Author(s):  
Colin Cameron ◽  
Preet P. S. Saluja ◽  
M. Antonio Floriano ◽  
Edward Whalley
Keyword(s):  
Chemical Kinetics ◽  
High Pressures ◽  
New Method ◽  
Very High

Chemical kinetics at very high pressures. I. Two experimental techniques

1986 ◽  
Vol 57 (11) ◽  
pp. 2791-2794 ◽  
Author(s):  
Preet P. S. Saluja ◽  
Colin Cameron ◽  
M. Antonio Floriano ◽  
Aurele Lavergne ◽  
Graham E. McLaurin ◽  
...  
Keyword(s):  
Chemical Kinetics ◽  
High Pressures ◽  
Experimental Techniques ◽  
Very High

Design and Analysis of Commercial Pressure Vessels to 500,000 Psi

1966 ◽  
Vol 88 (2) ◽  
pp. 500-506 ◽  
Author(s):  
I. Berman
Keyword(s):  
Material Property ◽  
Large Volume ◽  
Pressure Vessel ◽  
High Pressures ◽  
Pressure Vessels ◽  
New Method ◽  
Flow Strength ◽  
Property Changes ◽  
Shrink Fit ◽  
Very High

On the basis of the finiteness of the flow strength of structural materials, the pressures permitted by current methods of pressure vessel design are limited. In this paper the analysis of a new method of design of commercial large volume pressure vessels is presented. This new design, which is a controlled fluid fill, may be used for many excursions to very high pressures without failure. The pressure that may be attained seems limited only by material property changes at extreme hydrostatic pressures. Large volume commercial vessels to 500,000 psi with reasonable outer to inner diameters may be built. The controlled fluid-fill pressure vessels in addition to piercing the current upper pressure barrier is also competitive with the shrink-fit method at pressures as low as 15,000 psi.

scholarly journals Stellar magnetic imaging from spectropolarimetric data

1996 ◽  
Vol 176 ◽  
pp. 53-60 ◽  
Author(s):  
J.-F. Donati
Keyword(s):  
Small Amplitude ◽  
High Accuracy ◽  
Spectral Lines ◽  
New Method ◽  
Doppler Imaging ◽  
Magnetic Imaging ◽  
Active Stars ◽  
Surface Fields ◽  
Very High

In this paper, I will review the capabilities of magnetic imaging (also called Zeeman-Doppler imaging) to reconstruct spot distributions of surface fields from sets of rotationnally modulated Zeeman signatures in circularly polarised spectral lines. I will then outline a new method to measure small amplitude magnetic signals (typically 0.1% for cool active stars) with very high accuracy. Finally, I will present and comment new magnetic images reconstructed from data collected in 1993 December at the Anglo-Australian Telescope (AAT).

scholarly journals Gaseous combustion at high pressures. —Part X. The co-volume corrections, maximum temperatures and dissociation of steam and carbon dioxide in explosions

1928 ◽  
Vol 119 (782) ◽  
pp. 464-480
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Internal Energy ◽  
High Temperatures ◽  
High Pressures ◽  
Internal Combustion ◽  
Systematic Survey ◽  
Explosion Method ◽  
Maximum Temperatures ◽  
Very High

During the researches upon high-pressure explosions of carbonic oxide-air, hydrogen-air, etc., mixtures, which have been described in the previous papers of this series, a mass of data has been accumulated relating to the influence of density and temperature upon the internal energy of gases and the dissociation of steam and carbon dioxide. Some time ago, at Prof. Bone’s request, the author undertook a systematic survey of the data in question, and the present paper summarises some of the principal results thereof, which it is hoped will throw light upon problems interesting alike to chemists, physicists and internal-combustion engineers. The explosion method affords the only means known at present of determining the internal energies of gases at very high temperatures, and it has been used for this purpose for upwards of 50 years. Although by no means without difficulties, arising from uncertainties of some of the assumptions upon which it is based, yet, for want of a better, its results have been generally accepted as being at least provisionally valuable. Amongst the more recent investigations which have attracted attention in this connection should be mentioned those of Pier, Bjerrum, Siegel and Fenning, all of whom worked at low or medium pressures.

Responses of cerebral arteries and arterioles to acute hypotension and hypertension

1978 ◽  
Vol 234 (4) ◽  
pp. H371-H383 ◽  
Author(s):  
H. A. Kontos ◽  
E. P. Wei ◽  
R. M. Navari ◽  
J. E. Levasseur ◽  
W. I. Rosenblum ◽  
...  
Keyword(s):  
Pressure Range ◽  
High Pressures ◽  
Cerebral Arteries ◽  
Pial Arteries ◽  
Small Vessels ◽  
Size Dependent ◽  
Arterial Blood ◽  
Vascular Bed ◽  
Acute Hypotension ◽  
Very High

The responses of cerebral precapillary vessels to changes in arterial blood pressure were studied in anesthetized cats equipped with cranial windows for the direct observation of the pial microcirculation of the parietal cortex. Vessel responses were found to be size dependent. Between mean arterial pressures of 110 and 160 mmHg autoregulatory adjustments in caliber, e.g., constriction when the pressure rose and dilation when the pressure decreased, occurred only in vessels larger than 200 micron in diameter. Small arterioles, less than 100 micron in diameter, dilated only at pressures equal to or less than 90 mmHg; below 70 mmHg their dilation exceeded that of the larger vessels. When pressure rose to 170- 200 mmHg, small vessels dilated while the larger vessels remained constricted. At very high pressures (greater than 200 mmHg) forced dilation was frequently irreversible and was accompanied by loss of responsiveness to hypocapnia. Measurement of the pressure differences across various segments of the cerebral vascular bed showed that the larger surface cerebral vessels, extending from the circle of Willis to pial arteries 200 micron in diameter, were primarily responsible for the adjustments in flow over most of the pressure range.

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