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Angel Palomo - One of the best experts on this subject based on the ideXlab platform.
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hydration of hybrid alkaline cement containing a very large proportion of fly ash a Descriptive Model
Materials, 2016Co-Authors: Ines Garcialodeiro, Ana Fernandezjimenez, Shane Donatello, Angel PalomoAbstract:In hybrid alkaline fly ash cements, a new generation of binders, hydration, is characterized by features found in both ordinary portland cement (OPC) hydration and the alkali activation of fly ash (AAFA). Hybrid alkaline fly ash cements typically have a high fly ash (70 wt % to 80 wt %) and low clinker (20 wt % to 30 wt %) content. The clinker component favors curing at ambient temperature. A hydration mechanism is proposed based on the authors' research on these hybrid binders over the last five years. The mechanisms for OPC hydration and FA alkaline activation are summarized by way of reference. In hybrid systems, fly ash activity is visible at very early ages, when two types of gel are formed: C-S-H from the OPC and N-A-S-H from the fly ash. In their mutual presence, these gels tend to evolve, respectively, into C-A-S-H and (N,C)-A-S-H. The use of activators with different degrees of alkalinity has a direct impact on reaction kinetics but does not modify the main final products, a mixture of C-A-S-H and (N,C)-A-S-H gels. The proportion of each gel in the mix does, however, depend on the alkalinity generated in the medium.
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microstructure development of alkali activated fly ash cement a Descriptive Model
Cement and Concrete Research, 2005Co-Authors: Ana Fernandezjimenez, Angel Palomo, M CriadoAbstract:Abstract The microscopic study of a set of alkali-activated and thermally cured fly ash samples enabled the authors to establish a Descriptive Model for the microstructural development of fly ash-based cementitious geopolymers. The morphology of most fly ash particles (perfect spheres) not only makes microscopic research highly productive but facilitates the formulation of hypothesis explaining the fly ash activation over time through a series of consecutive steps that can be successfully fitted to real situations.
Ana Fernandezjimenez - One of the best experts on this subject based on the ideXlab platform.
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hydration of hybrid alkaline cement containing a very large proportion of fly ash a Descriptive Model
Materials, 2016Co-Authors: Ines Garcialodeiro, Ana Fernandezjimenez, Shane Donatello, Angel PalomoAbstract:In hybrid alkaline fly ash cements, a new generation of binders, hydration, is characterized by features found in both ordinary portland cement (OPC) hydration and the alkali activation of fly ash (AAFA). Hybrid alkaline fly ash cements typically have a high fly ash (70 wt % to 80 wt %) and low clinker (20 wt % to 30 wt %) content. The clinker component favors curing at ambient temperature. A hydration mechanism is proposed based on the authors' research on these hybrid binders over the last five years. The mechanisms for OPC hydration and FA alkaline activation are summarized by way of reference. In hybrid systems, fly ash activity is visible at very early ages, when two types of gel are formed: C-S-H from the OPC and N-A-S-H from the fly ash. In their mutual presence, these gels tend to evolve, respectively, into C-A-S-H and (N,C)-A-S-H. The use of activators with different degrees of alkalinity has a direct impact on reaction kinetics but does not modify the main final products, a mixture of C-A-S-H and (N,C)-A-S-H gels. The proportion of each gel in the mix does, however, depend on the alkalinity generated in the medium.
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microstructure development of alkali activated fly ash cement a Descriptive Model
Cement and Concrete Research, 2005Co-Authors: Ana Fernandezjimenez, Angel Palomo, M CriadoAbstract:Abstract The microscopic study of a set of alkali-activated and thermally cured fly ash samples enabled the authors to establish a Descriptive Model for the microstructural development of fly ash-based cementitious geopolymers. The morphology of most fly ash particles (perfect spheres) not only makes microscopic research highly productive but facilitates the formulation of hypothesis explaining the fly ash activation over time through a series of consecutive steps that can be successfully fitted to real situations.
M Criado - One of the best experts on this subject based on the ideXlab platform.
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microstructure development of alkali activated fly ash cement a Descriptive Model
Cement and Concrete Research, 2005Co-Authors: Ana Fernandezjimenez, Angel Palomo, M CriadoAbstract:Abstract The microscopic study of a set of alkali-activated and thermally cured fly ash samples enabled the authors to establish a Descriptive Model for the microstructural development of fly ash-based cementitious geopolymers. The morphology of most fly ash particles (perfect spheres) not only makes microscopic research highly productive but facilitates the formulation of hypothesis explaining the fly ash activation over time through a series of consecutive steps that can be successfully fitted to real situations.
Tony Ward - One of the best experts on this subject based on the ideXlab platform.
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a Descriptive Model of the offense process for female sexual offenders
Sexual Abuse: A Journal of Research and Treatment, 2008Co-Authors: Theresa A Gannon, Mariamne R Rose, Tony WardAbstract:Although considerable efforts have been made to develop and validate etiological Models of male sexual offending, no theory is available to guide research or practice with female sexual offenders (FSOs). In this study, the authors developed a Descriptive, offense process Model of female sexual offending. Systematic qualitative analyses (i.e., grounded theory) of 22 FSOs' offense interviews were used to develop a temporal Model documenting the contributory roles of cognitive, behavioral, affective, and contextual factors in female sexual abuse. The Model highlights notable similarities and divergences between male and female sexual offenders' vulnerability factors and offense styles. In particular, the Model incorporates male co-offender and group co-offender influences and describes how these interact with vulnerability factors to generate female sexual offending. The gender-specific research and clinical implications of the Model are discussed.
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Modeling the creative process a grounded theory analysis of creativity in the domain of art making
Creativity Research Journal, 2002Co-Authors: Maryanne Mace, Tony WardAbstract:ABSTRACT: In recent years a number of researchers have attempted to Model the cognitive, affective, behavioral, and contextual factors associated with the making of a work of art. However, very few studies have actually focused on understanding and describing what artists actually do during the creation of an artwork. Therefore, in this study grounded theory was used to investigate this phenomenon and to develop a Descriptive Model of the art-making process. In Study 1, 16 professional visual artists were interviewed over the course of making a work of art, which provided a Descriptive database of their working processes from the inception to the completion of the artwork. Grounded theory was used to analyze the data and to develop a dynamic, Descriptive Model of the art-making process. A second study involving 9 artists was undertaken to determine the validity of this Model. The results suggested that the Model has adequate content validity and sufficient scope to accommodate the working processes of a r...
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rapists offense processes a preliminary Descriptive Model
Journal of Interpersonal Violence, 2001Co-Authors: Devon L L Polaschek, Tony Ward, Stephen M. Hudson, Richard J SiegertAbstract:Models of the offense process set out to provide a description of the cognitive, behavioral, motivational, and contextual factors associated with a particular type of offense. They Model the temporal relationships between the variables of interest and focus explicitly on the proximal causes or the how of offending. In this study, qualitative analysis was used to develop a Descriptive Model of the offense process for 24 adult rapists. Sentenced offenders provided detailed retrospective descriptions of their thoughts, emotions, and behavior prior to and during their most recent rape. These descriptions were analyzed using a grounded-theory approach. The resulting preliminary Model contained the following six phases: background factors to the offense, goal formation, approach behavior, offense preparation, the offense, and postoffense behavior. These stages are discussed along with the Model's theoretical, research, and clinical implications. The Model is consistent with existing multivariate theories of rap...
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A Descriptive Model of the Offense Chain for Child Molesters
Journal of Interpersonal Violence, 1995Co-Authors: Tony Ward, Kirsten Louden, Stephen M. Hudson, William L. MarshallAbstract:A grounded theory approach was taken to the qualitative analysis of the descriptions of thoughts and feelings provided by 26 incarcerated child molesters while describing their most recent or typical offense. The resulting Descriptive Model comprised nine stages, with three contributing factors that describe the sequence of cognitive and behavioral events that form an offense chain. The Model incorporates offender type, offense type, and offers a description of the possible interactions between the various stages and factors. The Model was then applied to the offense descriptions of an independent sample of 12 incarcerated child molesters in order to ascertain its cross-sample validity and the reliability of classification. The results suggest that the Model has provisional validity and adequate interrater reliability. The theoretical, research, and clinical implications of the Descriptive Model are then discussed.
Chris Starmer - One of the best experts on this subject based on the ideXlab platform.
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developments in non expected utility theory the hunt for a Descriptive theory of choice under risk
Journal of Economic Literature, 2000Co-Authors: Chris StarmerAbstract:This article reviews recent developments in the economic theory of individual decision making under risk. Since the 1950s it has been known that individual choices violate the standard Model of expected utility in predictable ways. Considerable research effort has now been devoted to the project of developing a superior Descriptive Model. Following an overview of non-expected utility theories which distinguishes between "conventional" and "non-conventional" approaches, the paper seeks to assess these alternative Models in terms of empirical success (using laboratory and field data) and theoretical usefulness. The closing sections reflect on some new directions emerging in this literature.
