The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Ian C Parmee - One of the best experts on this subject based on the ideXlab platform.
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EMO - Poor-Definition, Uncertainty, and Human Factors - Satisfying Multiple Objectives in Real-World Decision-Making Environments
Lecture Notes in Computer Science, 2001Co-Authors: Ian C ParmeeAbstract:Ill-Definition, uncertainty and multiple objectives are primary characteristics of real-world decision-making processes. During the initial stages of such processes little knowledge appertaining to the problem at hand may be available. A primary task relates to improving problem Definition in terms of variables, constraint and both quantitative and qualitative objectives. The problem space develops with information gained in a dynamical process where optimisation plays a secondary role following the establishment of a well-defined problem domain. The paper speculates upon the role of evolutionary computing, complementary computational intelligence techniques and interactive systems that support such problem Definition where multiobjective satisfaction plays a major role.
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Poor Definition uncertainty and human factors satisfying multiple objectives in real world decision making environments
International Conference on Evolutionary Multi-criterion Optimization, 2001Co-Authors: Ian C ParmeeAbstract:Ill-Definition, uncertainty and multiple objectives are primary characteristics of real-world decision-making processes. During the initial stages of such processes little knowledge appertaining to the problem at hand may be available. A primary task relates to improving problem Definition in terms of variables, constraint and both quantitative and qualitative objectives. The problem space develops with information gained in a dynamical process where optimisation plays a secondary role following the establishment of a well-defined problem domain. The paper speculates upon the role of evolutionary computing, complementary computational intelligence techniques and interactive systems that support such problem Definition where multiobjective satisfaction plays a major role.
Jeff Lonnee - One of the best experts on this subject based on the ideXlab platform.
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hydrothermal dolomite a product of Poor Definition and imagination
Sedimentary Geology, 2002Co-Authors: Hans G. Machel, Jeff LonneeAbstract:Abstract The latest dolomite bandwagon is the “hydrothermal dolomite model”. In its present form, this bandwagon is doomed or at least very much overstated for at least two reasons: (1) there are several Definitions of hydrothermal, and hardly any author specifies which one s/he is using; (2) very few of the dolomites hitherto called hydrothermal have been demonstrated to be hydrothermal according to any Definition, except the worst. As presently applied, the term “hydrothermal dolomite” is confusing and/or meaningless. We suggest to use White's [Geol. Soc. Amer. Bull. 68 (1957) 1637] time-honored Definition of “hydrothermal” as “aqueous solutions that are warm or hot relative to its surrounding environment”, with no genetic implications regarding the fluid source. Hence, a dolomite should be called hydrothermal only if it can be demonstrated to have formed at a higher than ambient temperature, regardless of fluid source or drive. Furthermore, this Definition does not carry a lower or upper temperature limit. Even a dolomite formed at 40 °C could be hydrothermal. By extension, dolomites formed at temperatures lower than ambient are not hydrothermal, even if they formed at a rather high temperature. For example, groundwater may penetrate a rock sequence through a highly permeable pathway, such that it is heated to 150 °C at a depth where the surrounding rock has a temperature of 250 °C. We suggest to call dolomite formed from this water “hydrofrigid”. Dolomite formed in or near thermal equilibrium with the surrounding rocks may be called “geothermal”. Furthermore, not all saddle dolomite formation requires advection (fluid flow) to transport Mg. Saddle dolomite can be formed in at least three ways, i.e., from advection, local redistribution of older dolomite during stylolitization, and as a by-product of thermochemical sulfate reduction in a closed or semi-closed system. Only the first and the last of these three possibilities have a chance of being hydrothermal. Almost all dolomites and dolostones in the Western Canada Sedimentary Basin have recently been (re-)interpreted as hydrothermal. Applying the rationale outlined above reveals, however, that this basin contains very little hydrothermal dolomite. Rather, most dolomites in this basin, and almost all dolostones south of the Peace River Arch, are geothermal, and/or the proof of a hydrothermal origin has not been made. This has important implications beyond the various case studies at hand, as attempts to tie dolomitization to orogenic events become moot, at least in the southern part of the basin.
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Hydrothermal dolomite—a product of Poor Definition and imagination
Sedimentary Geology, 2002Co-Authors: Hans G. Machel, Jeff LonneeAbstract:Abstract The latest dolomite bandwagon is the “hydrothermal dolomite model”. In its present form, this bandwagon is doomed or at least very much overstated for at least two reasons: (1) there are several Definitions of hydrothermal, and hardly any author specifies which one s/he is using; (2) very few of the dolomites hitherto called hydrothermal have been demonstrated to be hydrothermal according to any Definition, except the worst. As presently applied, the term “hydrothermal dolomite” is confusing and/or meaningless. We suggest to use White's [Geol. Soc. Amer. Bull. 68 (1957) 1637] time-honored Definition of “hydrothermal” as “aqueous solutions that are warm or hot relative to its surrounding environment”, with no genetic implications regarding the fluid source. Hence, a dolomite should be called hydrothermal only if it can be demonstrated to have formed at a higher than ambient temperature, regardless of fluid source or drive. Furthermore, this Definition does not carry a lower or upper temperature limit. Even a dolomite formed at 40 °C could be hydrothermal. By extension, dolomites formed at temperatures lower than ambient are not hydrothermal, even if they formed at a rather high temperature. For example, groundwater may penetrate a rock sequence through a highly permeable pathway, such that it is heated to 150 °C at a depth where the surrounding rock has a temperature of 250 °C. We suggest to call dolomite formed from this water “hydrofrigid”. Dolomite formed in or near thermal equilibrium with the surrounding rocks may be called “geothermal”. Furthermore, not all saddle dolomite formation requires advection (fluid flow) to transport Mg. Saddle dolomite can be formed in at least three ways, i.e., from advection, local redistribution of older dolomite during stylolitization, and as a by-product of thermochemical sulfate reduction in a closed or semi-closed system. Only the first and the last of these three possibilities have a chance of being hydrothermal. Almost all dolomites and dolostones in the Western Canada Sedimentary Basin have recently been (re-)interpreted as hydrothermal. Applying the rationale outlined above reveals, however, that this basin contains very little hydrothermal dolomite. Rather, most dolomites in this basin, and almost all dolostones south of the Peace River Arch, are geothermal, and/or the proof of a hydrothermal origin has not been made. This has important implications beyond the various case studies at hand, as attempts to tie dolomitization to orogenic events become moot, at least in the southern part of the basin.
Hans G. Machel - One of the best experts on this subject based on the ideXlab platform.
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hydrothermal dolomite a product of Poor Definition and imagination
Sedimentary Geology, 2002Co-Authors: Hans G. Machel, Jeff LonneeAbstract:Abstract The latest dolomite bandwagon is the “hydrothermal dolomite model”. In its present form, this bandwagon is doomed or at least very much overstated for at least two reasons: (1) there are several Definitions of hydrothermal, and hardly any author specifies which one s/he is using; (2) very few of the dolomites hitherto called hydrothermal have been demonstrated to be hydrothermal according to any Definition, except the worst. As presently applied, the term “hydrothermal dolomite” is confusing and/or meaningless. We suggest to use White's [Geol. Soc. Amer. Bull. 68 (1957) 1637] time-honored Definition of “hydrothermal” as “aqueous solutions that are warm or hot relative to its surrounding environment”, with no genetic implications regarding the fluid source. Hence, a dolomite should be called hydrothermal only if it can be demonstrated to have formed at a higher than ambient temperature, regardless of fluid source or drive. Furthermore, this Definition does not carry a lower or upper temperature limit. Even a dolomite formed at 40 °C could be hydrothermal. By extension, dolomites formed at temperatures lower than ambient are not hydrothermal, even if they formed at a rather high temperature. For example, groundwater may penetrate a rock sequence through a highly permeable pathway, such that it is heated to 150 °C at a depth where the surrounding rock has a temperature of 250 °C. We suggest to call dolomite formed from this water “hydrofrigid”. Dolomite formed in or near thermal equilibrium with the surrounding rocks may be called “geothermal”. Furthermore, not all saddle dolomite formation requires advection (fluid flow) to transport Mg. Saddle dolomite can be formed in at least three ways, i.e., from advection, local redistribution of older dolomite during stylolitization, and as a by-product of thermochemical sulfate reduction in a closed or semi-closed system. Only the first and the last of these three possibilities have a chance of being hydrothermal. Almost all dolomites and dolostones in the Western Canada Sedimentary Basin have recently been (re-)interpreted as hydrothermal. Applying the rationale outlined above reveals, however, that this basin contains very little hydrothermal dolomite. Rather, most dolomites in this basin, and almost all dolostones south of the Peace River Arch, are geothermal, and/or the proof of a hydrothermal origin has not been made. This has important implications beyond the various case studies at hand, as attempts to tie dolomitization to orogenic events become moot, at least in the southern part of the basin.
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Hydrothermal dolomite—a product of Poor Definition and imagination
Sedimentary Geology, 2002Co-Authors: Hans G. Machel, Jeff LonneeAbstract:Abstract The latest dolomite bandwagon is the “hydrothermal dolomite model”. In its present form, this bandwagon is doomed or at least very much overstated for at least two reasons: (1) there are several Definitions of hydrothermal, and hardly any author specifies which one s/he is using; (2) very few of the dolomites hitherto called hydrothermal have been demonstrated to be hydrothermal according to any Definition, except the worst. As presently applied, the term “hydrothermal dolomite” is confusing and/or meaningless. We suggest to use White's [Geol. Soc. Amer. Bull. 68 (1957) 1637] time-honored Definition of “hydrothermal” as “aqueous solutions that are warm or hot relative to its surrounding environment”, with no genetic implications regarding the fluid source. Hence, a dolomite should be called hydrothermal only if it can be demonstrated to have formed at a higher than ambient temperature, regardless of fluid source or drive. Furthermore, this Definition does not carry a lower or upper temperature limit. Even a dolomite formed at 40 °C could be hydrothermal. By extension, dolomites formed at temperatures lower than ambient are not hydrothermal, even if they formed at a rather high temperature. For example, groundwater may penetrate a rock sequence through a highly permeable pathway, such that it is heated to 150 °C at a depth where the surrounding rock has a temperature of 250 °C. We suggest to call dolomite formed from this water “hydrofrigid”. Dolomite formed in or near thermal equilibrium with the surrounding rocks may be called “geothermal”. Furthermore, not all saddle dolomite formation requires advection (fluid flow) to transport Mg. Saddle dolomite can be formed in at least three ways, i.e., from advection, local redistribution of older dolomite during stylolitization, and as a by-product of thermochemical sulfate reduction in a closed or semi-closed system. Only the first and the last of these three possibilities have a chance of being hydrothermal. Almost all dolomites and dolostones in the Western Canada Sedimentary Basin have recently been (re-)interpreted as hydrothermal. Applying the rationale outlined above reveals, however, that this basin contains very little hydrothermal dolomite. Rather, most dolomites in this basin, and almost all dolostones south of the Peace River Arch, are geothermal, and/or the proof of a hydrothermal origin has not been made. This has important implications beyond the various case studies at hand, as attempts to tie dolomitization to orogenic events become moot, at least in the southern part of the basin.
Alexander B Niculescu - One of the best experts on this subject based on the ideXlab platform.
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Schizophrenia: from genetics to biology to predictive medicine.
The Journal of clinical psychiatry, 2014Co-Authors: Alexander B NiculescuAbstract:Identifying genes for psychiatric disorders using traditional genetic approaches has thus far proven quite difficult. Reasons for this include the complexity of these disorders and the Poor Definition of the clinical phenotype. However, recent studies have demonstrated the power of an approach called convergent functional genomics (CFG). CFG is a methodology that integrates different types of data to increase the ability to identify genes involved in various psychiatric and nonpsychiatric disorders. The work exemplified in this article integrated human brain and blood gene expression data, relevant animal model brain and blood gene expression data, and human genetic data to identify candidate genes and blood biomarkers for schizophrenia.
J. G. Pike - One of the best experts on this subject based on the ideXlab platform.
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Heat Transport Visualization in Helium II Using Focused Shadowgraph and Schlieren Techniques
Advances in Cryogenic Engineering, 1995Co-Authors: D. M. Coulter, A. C. Leonard, J. G. PikeAbstract:High-speed still and moving photographs, using diffused back lighting, associated with earlier studies [1,2] of heat transport from a horizontal wire to helium II were of limited value because of the Poor Definition of the boundaries between the liquid and gaseous phases. It was felt that the use of improved optical techniques would overcome this deficiency. This paper describes the use of focused shadowgraph and schlieren techniques for the visualization of heat transfer in helium II.