Temperature dependence of fluorescence of crude oils and related compounds

1992 ◽  
Vol 6 (5) ◽  
pp. 545-552 ◽  
Author(s):  
Yifu Zhu ◽  
Oliver C. Mullins
Keyword(s):  
Temperature Dependence ◽  
Crude Oils ◽  
Related Compounds

High molecular weight aromatic nitrogen and other novel hopanoid-related compounds in crude oils

2004 ◽  
Vol 35 (6) ◽  
pp. 665-678 ◽  
Author(s):  
T.B.P Oldenburg ◽  
H Huang ◽  
P Donohoe ◽  
H Willsch ◽  
S.R Larter
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crude Oils ◽  
Related Compounds

Analysis of Polychlorinated Dioxins and Furans in Samples of the Toxic Oil Syndrome

1993 ◽  
Vol 12 (4) ◽  
pp. 273-278
Author(s):  
Raimon Guitart ◽  
Lars Nørgaard ◽  
Giulio Mariani ◽  
Manuel Posada ◽  
Ignacio Abaitúa ◽  
...  
Keyword(s):  
Toxic Effects ◽  
Crude Oils ◽  
Chlorinated Phenols ◽  
Toxic Oil Syndrome ◽  
Dioxins And Furans ◽  
Wide Range ◽  
And Control ◽  
Related Compounds

1 Polychlorinated dioxins (PCDDs) and furans (PCDFs) are known to produce a wide range of toxic effects. 2 PCDDs and PCDFs are typical contaminants of chlorinated phenols, and pentachlorophenol and related compounds have been shown to be widely distributed among selected oil samples taken from the 1981 Spanish toxic oil epidemic. 3 Six control and eight case oil samples were analysed using GC/MS for PCDDs and PCDFs. Only small concentrations, normally below 1 ng g-1, of the higher chlorinated PCDDs and PCDFs were detected. There were no statistical differences between the case and control oils. 4 These levels seem to be too low to elicit toxic effects, although they could be enough to potentiate the toxicity of other xenobiotics present in the oils. However, it is uncertain whether the levels of these compounds measured in 1990 reflect the levels present when the oils were consumed in 1981, or whether or not the levels measured in crude oils are representative of fried oils.

Temperature dependence on addition of urea and its related compounds on formation of neodymium condensed phosphates

2005 ◽  
Vol 26 (8) ◽  
pp. 711-716 ◽  
Author(s):  
Hiroaki Onoda ◽  
Atsushi Takenaka ◽  
Kazuo Kojima ◽  
Hiroyuki Nariai
Keyword(s):  
Temperature Dependence ◽  
Condensed Phosphates ◽  
Related Compounds

The Temperature Dependence of Carbon-13 Chemical Shifts of Retinal Isomers and Their Related Compounds

1980 ◽  
Vol 53 (1) ◽  
pp. 239-242 ◽  
Author(s):  
Yoshito Hanafusa ◽  
Masakazu Toda ◽  
Yoshio Inoue ◽  
Riichiro Chûjô
Keyword(s):  
Temperature Dependence ◽  
Chemical Shifts ◽  
Related Compounds ◽  
Retinal Isomers

scholarly journals Dynamical Properties of Omani Crude Oils for Flow Through a Vertical Annulus and a Cylindrical Pipe

2011 ◽  
Vol 16 ◽  
pp. 102
Author(s):  
Sayyadul Arafin ◽  
S.M. Mujibur Rahman
Keyword(s):  
Fluid Flow ◽  
Crude Oil ◽  
Temperature Dependence ◽  
Viscous Force ◽  
Crude Oils ◽  
Cylindrical Pipe ◽  
Mass Rate ◽  
Flow Approximation ◽  
Dynamical Properties ◽  
Vertical Annulus

We have initially investigated the temperature dependence of density and viscosity of a number of crude oils, collected from various hydrocarbon reservoirs in Oman. The measured data are then utilized to investigate the flow dynamics of these hydrocarbon fluids under gravity and applied pressures at various temperatures. We have modeled the flow of the various crude oil samples through a vertical (a) annulus and (b) cylindrical pipe - all treated within the Newtonian fluid flow approximation of a laminar flow - to investigate the flow properties of these samples. A computer program is developed so that the temperature dependence of the fluid flow distinctly separates the laminar mode from a turbulent mode with respect to Reynolds numbers within the ranges Re<2000 and Re>2000. The adopted models of the velocity profiles, mass rate of flow and viscous force on the solid surface are not novel, but the present calculations aim to specifically use the various Omani crude oil samples with various AIP values; the calculated results shed some light on the dynamics of these specific samples within Newtonian approximation. The measured physical properties and the subsequent calculations of the relevant dynamical properties might be useful for various purposes e.g. extraction and transportation of crude oils through pipes.    

Thermoelectric Properties of CaxCo2O4 Aligned Crystals

2005 ◽  
Vol 20 (11) ◽  
pp. 3082-3087 ◽  
Author(s):  
M. Shikano ◽  
R. Funahashi ◽  
M. Kitawaki
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Thermoelectric Properties ◽  
Layered Structure ◽  
Phonon Scattering ◽  
Stacking Faults ◽  
Chloride Flux ◽  
Typical Size ◽  
Related Compounds

Agglomerates of aligned crystals of CaxCo2O4 with a layer of CoO2 were grown using a chloride flux technique, and their thermoelectric properties in air were determined. The agglomerates take the form of a very thin flakelike cluster of crystals with a typical size of almost 3 × 2 × 0.07 mm. The values of thermoelectric power along the ab-plane are larger than 200 μV K−1 at temperatures above 873 K and reach almost 300 μV K−1 at 973 K. The temperature dependence of the electrical resistivity along the ab-plane shows bends around 450 and 825 K, and the ln ρab−T−1 curve followed an Arrhenius-type behavior below 450 K. Temperature dependence of thermal conductivity indicated that stacking faults along the c axis induce phonon scattering like that in a misfit-layered structure. The effect of the CoO2 layer on thermoelectric performance is discussed in comparison with related compounds.

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