Determination of Zirconium by Precipitation from Homogeneous Solution

1949 ◽  
Vol 21 (2) ◽  
pp. 293-295 ◽  
Author(s):  
H. H. Willard ◽  
R. B. Hahn
Keyword(s):  
Homogeneous Solution

Ultraviolet Spectroscopy for the Analysis of Oil-In-Water Effluent Using Isopropanol as Co-Solvent

1997 ◽  
Vol 51 (3) ◽  
pp. 318-322 ◽  
Author(s):  
Trevor Bastow ◽  
William H. Durnie ◽  
Alan Jefferson ◽  
James Pang
Keyword(s):  
Petroleum Hydrocarbons ◽  
Homogeneous Solution ◽  
Direct Analysis ◽  
Ultraviolet Spectroscopy ◽  
Hydrocarbon Content ◽  
Oil In Water ◽  
Current Production ◽  
Oily Water ◽  
Clear Solution

Direct analysis of oily water effluents was investigated as a method for the determination of petroleum hydrocarbons in the discharge from primary oil production facilities. A co-solvent, isopropanol (2-propanol), was chosen that produced a clear, homogeneous solution when added to oil-in-water effluent. The clear solution was then analyzed directly for aromatic hydrocarbon content by using ultraviolet spectroscopy. The concentration of oil in the sample was calculated from a Lambert–Beer plot at 226 nm. The standard used was a sample of oil that best represented the oil that had contacted the water, i.e., current production crude oil.

A New Analytical Approach for the Determination of the Transient Response in Elastic Mechanisms

1992 ◽  
Author(s):  
T. Xu ◽  
G. G. Lowen
Keyword(s):  
Transient Response ◽  
Analytical Approach ◽  
Characteristic Exponent ◽  
Homogeneous Solution ◽  
Mathematical Work ◽  
Floquet Solution ◽  
Simulation Based ◽  
Elastic Mechanism ◽  
Type Differential Equation

Abstract Recent work on multi-regime per cycle machinery has shown that for such systems the transient response of the link deflections, which is governed by the homogeneous solution to a Hill-type differential equation, cannot be neglected in a meaningful simulation. Based on mathematical work by E.T. Whittaker, a new analytical approach for obtaining such transient responses is given. It is achieved by the determination of the characteristic exponent in the stable regions of the Floquet solution to the Hill’s equation involved. This technique is applied to a specific elastic mechanism. Several sample computations show that the transient response may vary from near-periodic to totally aperiodic.

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