Solubility of mixtures of hydrogen sulfide and carbon dioxide in a monoethanolamine solution at low partial pressures

1980 ◽  
Vol 25 (2) ◽  
pp. 118-120 ◽  
Author(s):  
Ezra E. Isaacs ◽  
Fred D. Otto ◽  
Alan E. Mather
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Sulfide ◽  
Partial Pressures

Effect of Environmental Factors on Corrosion Fatigue Performance of Duplex 2507

2012 ◽  
Author(s):  
Ramgopal Thodla ◽  
Carlos Joia ◽  
Palmieri Baptista
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Sulfide ◽  
Corrosion Fatigue ◽  
Environmental Effect ◽  
Fatigue Performance ◽  
Duplex Microstructure ◽  
Partial Pressures ◽  
Frequency Scan ◽  
Austenite Grains ◽  
Weakly Dependent

Corrosion fatigue performance of welded duplex 2507 riser material environments containing high partial pressures of carbon dioxide (100–200 bar) and limited quantity of hydrogen sulfide (0–0.12 bar) is presented in this paper. da/dN vs ΔK at different frequencies as a function of various environmental were studied. In the range of environments studies there was no significant environmental effect on the FCGR. da/dN measurements were performed starting at an initial ΔK of 150Nmm-3/2 and crack growth was readily established suggesting that ΔKth were lower than this value. Frequency scan tests were performed in various environments and the FCGR was found to be weakly dependent on frequency. The highest increase in FCGR was about 3–4x over the air values. The effect of duplex microstructure will also be discussed by comparing results from plate samples of 2507 with differing microstructure. The FCGR was higher with the plate samples which had precipitation of ferrite within the austenite grains which may have led to the higher FCGR. Frequency scan results for the plate samples will be compared with the results from the riser material.

Inspiratory Speech as a Management Option for Spastic Dysphonia

1992 ◽  
Vol 101 (5) ◽  
pp. 375-382 ◽  
Author(s):  
Gordon A. Harrison ◽  
Richard H. Troughear ◽  
Pamela J. Davis ◽  
Alison L. Winkworth
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Voice Quality ◽  
Management Option ◽  
Communication Problems ◽  
Partial Pressures ◽  
The Subject ◽  
And Control ◽  
Laryngeal Resistance

A case study is reported of a subject who has used inspiratory speech (IS) for 6 years as a means of overcoming the communication problems of long-standing adductor spastic dysphonia (ASD). The subject was studied to confirm his use of IS, determine the mechanisms of its production, investigate its effects on ventilatory gas exchange, and confirm that it was perceptually preferable to ASD expiratory speech (ES). Results showed that the production and control of a high laryngeal resistance to airflow were necessary for usable IS. Voice quality was quantitatively and perceptually poor; however, the improved fluency and absence of phonatory spasm made IS the preferred speaking mode for both the listener and the speaker. Transcutaneous measurements of the partial pressures of oxygen and carbon dioxide in the subject's blood were made during extended speaking periods. These measurements indicated that ventilation was unchanged during IS, and that ventilation during ES was similar to the “hyperventilation” state of normal speakers. The reasons for the absence of phonatory spasm during IS are discussed, and the possibility of its use as a noninvasive management option for other ASD sufferers is addressed.

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