Wax precipitation from North Sea crude oils. 2. Solid-phase content as function of temperature determined by pulsed NMR

1991 ◽  
Vol 5 (6) ◽  
pp. 908-913 ◽  
Author(s):  
Walther Batsberg Pedersen ◽  
Asger Baltzer Hansen ◽  
Elfinn Larsen ◽  
Anne B. Nielsen ◽  
Hans Petter Roenningsen
Keyword(s):  
North Sea ◽  
Solid Phase ◽  
Crude Oils ◽  
Phase Content ◽  
Wax Precipitation ◽  
Solid Phase Content ◽  
Pulsed Nmr

scholarly journals Synthesis and Tribological Properties of Bio-Inspired Nacre-Like Composites

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1563 ◽  
Author(s):  
Hang Zhang ◽  
Shuhai Liu ◽  
Huaping Xiao ◽  
Xun Zhang
Keyword(s):  
Fracture Toughness ◽  
Friction Coefficient ◽  
Layered Structure ◽  
Solid Phase ◽  
Drilling Fluid ◽  
Phase Content ◽  
Wear Scar Diameter ◽  
Solid Phase Content ◽  
Water Based ◽  
Dry Conditions

Ceramic materials possessing the properties of high-strength and rigidity are widely used in industry. The shell nacre has a layered structure containing both macroscopic and microscopic levels and is equipped with superior qualities regarding hardness and strength. Therefore, the ceramic composites with a nacre-like layered structure have the potential to be utilized as sliding bearings employed in the harsh conditions of wells. For the purpose of this paper, a porous Al2O3 ceramics skeleton with nanometer powder is prepared using the freeze-casting method. Then the porous ceramic skeleton is filled with polymer polymethyl methacrylate (PMMA) through mass polymerization to produce a bionic Al2O3/PMMA composite with a lamellar structure. The properties of the prepared composite are determined by the analysis of micro-hardness, fracture toughness, friction coefficient, wear scar diameter, and the morphology of the worn surface. Consequent results indicate that elevation in the A12O3 powder, which acts as the initial solid phase content, prompts the ceramic slurry to exhibit an increase in viscosity and a gradual decrease in the pore size of the ceramic skeleton. The prepared layered Al2O3/PMMA composite possesses high fracture toughness, which closely resembles that of Al, is approximately four times that of the matrix of the Al2O3 ceramics and 16 times that of the PMMA. Three kinds of composites containing different solid phase content are subjected to testing involving lubrication by water-based drilling fluid to determine the friction coefficient of each. The results indicate that an increased load leads to a decreased friction coefficient while the impact of speed is not evident. Under dry conditions, the friction coefficient of three different composites tested, declines with elevated load and speed. With the use of water-based drilling fluid as lubrication, the wear scar diameter increases at higher speed, while dry conditions denote increased load. Abrasive wear is determined to be the principal form of erosion of layered Al2O3/PMMA composites.

Wax precipitation from North Sea crude oils. 3. Precipitation and dissolution of wax studied by differential scanning calorimetry

1991 ◽  
Vol 5 (6) ◽  
pp. 914-923 ◽  
Author(s):  
Asger Baltzer Hansen ◽  
Elfinn Larsen ◽  
Walther Batsberg Pedersen ◽  
Anne B. Nielsen ◽  
Hans Petter Roenningsen
Keyword(s):  
Differential Scanning Calorimetry ◽  
North Sea ◽  
Crude Oils ◽  
Scanning Calorimetry ◽  
Wax Precipitation

X-ray based measurements of the local solid phase content in a three-phase flow of a bubble column: statistical significance

2004 ◽  
Vol 37 (6) ◽  
pp. 923-928 ◽  
Author(s):  
U. Kertzscher ◽  
G. Dimitroff ◽  
M. Binsteiner ◽  
K. Affeld ◽  
L. Goubergrits ◽  
...  
Keyword(s):  
Solid Phase ◽  
Bubble Column ◽  
Statistical Significance ◽  
Phase Flow ◽  
Phase Content ◽  
X Ray ◽  
Three Phase ◽  
Solid Phase Content ◽  
Three Phase Flow

The Development of Hydraulic Water Separator Used in Construction

2012 ◽  
Vol 433-440 ◽  
pp. 1391-1396
Author(s):  
Xiao Chen Chen ◽  
Jing Guang Liu ◽  
Guo Hong Xie
Keyword(s):  
Particle Size ◽  
Solid Phase ◽  
Control Function ◽  
Servo Control ◽  
Phase Content ◽  
Water Parameters ◽  
Servo Control System ◽  
Solid Phase Content ◽  
Water Separator ◽  
Hydraulic Servo

Hydraulic water separator can realize the automatic control function by the use of pump-control speed electro-hydraulic servo control system. It can keep the centrifuge adapting to the changes of the water parameters fully with the real-time date collection of centrifugal speed according to different parameters including the density, viscosity, solid-phase content and particle size. It can achieve the best effect by the assurance that the centrifuge is always in the best condition.

Wax precipitation from North Sea crude oils: 1. Crystallization and dissolution temperatures, and Newtonian and non-Newtonian flow properties

1991 ◽  
Vol 5 (6) ◽  
pp. 895-908 ◽  
Author(s):  
Hans Petter Roenningsen ◽  
Brit Bjoerndal ◽  
Asger Baltzer Hansen ◽  
Walther Batsberg Pedersen
Keyword(s):  
North Sea ◽  
Crude Oils ◽  
Flow Properties ◽  
Newtonian Flow ◽  
Wax Precipitation

scholarly journals Synthesis of zirconia colloidal dispersions by forced hydrolysis

2006 ◽  
Vol 71 (6) ◽  
pp. 613-619 ◽  
Author(s):  
Jelena Markovic ◽  
Slobodan Milonjic
Keyword(s):  
Crystal Structure ◽  
Solid Phase ◽  
Colloidal Dispersions ◽  
Phase Content ◽  
Acidic Solutions ◽  
Solid Phase Content ◽  
Forced Hydrolysis ◽  
Hydrated Zirconia

Different zirconia colloidal dispersions (sols) were prepared from zirconyl oxynitrate and zirconyl oxychloride solutions by forced hydrolysis. Vigorously stirred acidic solutions of these salts were refluxed at 102 oC for 24 h. Characterization of the obtained sols (pH, solid phase content crystal structure) was performed by potentiometric, XRD, TGA/DTA and SEM measurements. The prepared sols contained almost spherical monoclinic hydrated zirconia particles 7-10 nm in diameter.

Wax precipitation from North Sea crude oils. 4. Thermodynamic modeling

1991 ◽  
Vol 5 (6) ◽  
pp. 924-932 ◽  
Author(s):  
Karen Schou Pedersen ◽  
Per Skovborg ◽  
Hans Petter Roenningsen
Keyword(s):  
North Sea ◽  
Thermodynamic Modeling ◽  
Crude Oils ◽  
Wax Precipitation

A Method for the Determination of the Solid Phase Content of Fats Using Pulse Nuclear Magnetic Resonance

1978 ◽  
Vol 80 (5) ◽  
pp. 180-186 ◽  
Author(s):  
J. C. Vanden Enden ◽  
A. J. Haighton ◽  
K. van Putte ◽  
L. F. Vermaas ◽  
D. Waddington
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Solid Phase ◽  
Phase Content ◽  
Pulse Nuclear Magnetic Resonance ◽  
Solid Phase Content ◽  
Nuclear Magnetic
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