David J Van Camp
Engineers at Technology Dr S 132, Irvine, CA
License number
Colorado 25679
Issued Date
Jul 8, 1988
Renew Date
Jul 31, 2002
Expiration Date
Jul 31, 2002
Type
Professional Engineer
Address
Address
16 Technology Dr S 132, Irvine, CA 92618
Professional information
System And Method For Efficient Computation Of Simulated Thermodynamic Property And Phase Equilibrium Characteristics Using Comprehensive Local Property Models
US Patent:
7676352, Mar 9, 2010
Filed:
Apr 19, 2005
Appl. No.:
11/109840
Inventors:
David J. Van Peursem - Irvine CA, US
Gang Xu - Corona CA, US
Gang Xu - Corona CA, US
Assignee:
Invensys Systems, Inc. - Foxboro MA
International Classification:
G06F 9/455
US Classification:
703 9, 703 2, 73 2501, 137828
Abstract:
A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.
System And Method For Efficient Computation Of Simulated Thermodynamic Property And Phase Equilibrium Characteristics Using Comprehensive Local Property Models
US Patent:
7987082, Jul 26, 2011
Filed:
Feb 1, 2010
Appl. No.:
12/698063
Inventors:
David J. Van Peursem - Irvine CA, US
Gang Xu - Corona CA, US
Gang Xu - Corona CA, US
Assignee:
Invensys Systems, Inc. - Foxboro MA
International Classification:
G06F 9/455
US Classification:
703 9, 73 2501
Abstract:
A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.
Thermodynamic Process Control Based On Pseudo-Density Root For Equation Of State
US Patent:
8165860, Apr 24, 2012
Filed:
Aug 25, 2009
Appl. No.:
12/547145
Inventors:
Gang Xu - Irvine CA, US
David Bluck - Yorba Linda CA, US
David J. Van Peursem - Irvine CA, US
Ian H. Boys - Vista CA, US
David Bluck - Yorba Linda CA, US
David J. Van Peursem - Irvine CA, US
Ian H. Boys - Vista CA, US
Assignee:
Invensys Systems, Inc - Foxboro MA
International Classification:
G06F 9/455
US Classification:
703 12
Abstract:
A system for thermodynamic modeling is provided. The system comprises a computer having a processor, a thermodynamic process simulation application, and a thermodynamic equation of state application. When executed by the processor, the thermodynamic equation of state application determines a density root based on a first and second point of departure from an equation of state and based on a first and a second extrapolation equation. The first departure point satisfies the equation.
Asymmetric Ligands Useful For Transition Metal Catalyzed Bond Forming Reactions
US Patent:
5739396, Apr 14, 1998
Filed:
Jun 7, 1995
Appl. No.:
8/487039
Inventors:
Barry M. Trost - Los Altos Hills CA
David L. Van Vranken - Irvine CA
Richard C. Bunt - Redwood City CA
David L. Van Vranken - Irvine CA
Richard C. Bunt - Redwood City CA
Assignee:
Stanford University - Stanford CA
International Classification:
C07F 928, C07F 950
US Classification:
564 15
Abstract:
Ligands useful for transition metal catalyzed bond forming reactions are provided with a metal binding portion having at least one metal binding moiety ##STR1## wherein Ar and Ar' each is an aryl or a heteroaryl. These ligands may be prepared by providing an aromatic carboxylic acid having a diarylphosphino or diheteroarylphosphino substituent on the aromatic ring, and forming an ester or an amide derivative of the carboxylic acid by coupling with a chiral diol or a chiral diamine. The ligands facilitate, for example, flexible strategies for enantiocontrolled construction of five membered carbocyclic rings with varying substitution patterns and high enantioselectivity.