Simulation des rheologischen Verhaltens von zementgebundenen Feinkornsystemen

Basierend auf eigenen Fließ- und Füllversuchsreihen und vergleichenden 2D- und 3D-Simulationen wurde ein Verfahren zur numerischen Simulation des Fließ- und Füllverhaltens von zementgebundenen Feinkornsystemen mit und ohne Stahlfasern entwickelt bzw. weiterentwickelt. Das stark zeit- und scherratenabhängige rheologische Verhalten dieser Feinkornsysteme wurde mit einem Rotationsrheometer anhand speziell entwickelter Messprofile untersucht und mittels eines geeigneten Modells abgebildet. Im Rahmen von Parameterstudien und Vergleichen der experimentellen Ergebnisse der durchgeführten Haegermann- und L-Box-Versuche mit denen der Simulation wurden Simulationsparameter und -modelle angepasst und validiert. Das Fließ- und Füllverhalten der untersuchten Feinkornsysteme konnte dadurch mit der verwendeten Software-Plattform „Complex Rheology Solver“ (CoRheoS) zufriedenstellend beschrieben werden. Darüber hinaus wurde die Orientierung von Stahlfasern mithilfe einer bi-direktionalen Kopplung der Gleichungen für das Fließverhalten der Feinkornsysteme mit denen für die Faserorientierung qualitativ gut wiedergegeben.A numerical simulation procedure for the flow and form filling behaviour of cement-based fine grain systems with and without steel fibres was developed based on specifically performed series of flow and filling tests and comparative 2D- and 3D-simulations. The time- and shearrate-dependant behaviour of the fine grain systems was represented by a suitable model based on investigations using a rotational rheometer and applying specifically developed measuring profiles. The numerical simulation was based on this rheological behaviour. Parameter studies and their evaluation by comparison to results of Haegermann and L-Box experiments were used to adjust and validate simulation parameters and simulation models. Thus, the flow and form filling behaviour of the investigated fine grain systems could be described sufficiently with the software platform “Complex Rheology Solver” (CoRheoS). The description of steel fibre orientation by means of a bi-directionally coupling of the equations for flow behaviour of fine grain systems and those for fibre orientation was fairly good

A Web Service Market Model based on Dependencies

ABSTRACT The construction of composite Web Services from service fragments requires semantic descriptions of service offers and service requests. We propose the use of dependencies as a modeling concept to describe service requests and service offers and outline a Web Service Market, that constructs composite services, offered by a temporary network of economically independent service providers, by resolving dependencies based on coordination theory

BAK1 regulates the accumulation of jasmonic acid and the levels of trypsin proteinase inhibitors in Nicotiana attenuata's responses to herbivory

BAK1 is a co-receptor of brassinosteroid (BR) receptor BRI1, and plays a well-characterized role in BR signalling. BAK1 also physically interacts with the flagellin receptor FLS2 and regulates pathogen resistance. The role of BAK1 in mediating Nicotiana attenuata's resistance responses to its specialist herbivore, Manduca sexta, was examined here. A virus-induced gene-silencing system was used to generate empty vector (EV) and NaBAK1-silenced plants. The wounding- and herbivory-induced responses were examined on EV and NaBAK1-silenced plants by wounding plants or simulating herbivory by treating wounds with larval oral secretions (OS). After wounding or OS elicitation, NaBAK1-silenced plants showed attenuated jasmonic acid (JA) and JA-isoleucine bursts, phytohormone responses important in mediating plant defences against herbivores. However, these decreased JA and JA-Ile levels did not result from compromised MAPK activity or elevated SA levels. After simulated herbivory, NaBAK1-silenced plants had EV levels of defensive secondary metabolites, namely, trypsin proteinase inhibitors (TPIs), and similar levels of resistance to Manduca sexta larvae. Additional experiments demonstrated that decreased JA levels in NaBAK1-VIGS plants, rather than the enzymatic activity of JAR proteins or Ile levels, were responsible for the reduced JA-Ile levels observed in these plants. Methyl jasmonate application elicited higher levels of TPI activity in NaBAK1-silenced plants than in EV plants, suggesting that silencing NaBAK1 enhances the accumulation of TPIs induced by a given level of JA. Thus NaBAK1 is involved in modulating herbivory-induced JA accumulation and how JA levels are transduced into TPI levels in N. attenuata

Simulation des rheologischen Verhaltens von zementgebundenen Feinkornsystemen

Basierend auf eigenen Fließ- und Füllversuchsreihen und vergleichenden 2D- und 3D-Simulationen wurde ein Verfahren zur numerischen Simulation des Fließ- und Füllverhaltens von zementgebundenen Feinkornsystemen mit und ohne Stahlfasern entwickelt bzw. weiterentwickelt. Das stark zeit- und scherratenabhängige rheologische Verhalten dieser Feinkornsysteme wurde mit einem Rotationsrheometer anhand speziell entwickelter Messprofile untersucht und mittels eines geeigneten Modells abgebildet. Im Rahmen von Parameterstudien und Vergleichen der experimentellen Ergebnisse der durchgeführten Haegermann- und L-Box-Versuche mit denen der Simulation wurden Simulationsparameter und -modelle angepasst und validiert. Das Fließ- und Füllverhalten der untersuchten Feinkornsysteme konnte dadurch mit der verwendeten Software-Plattform „Complex Rheology Solver“ (CoRheoS) zufriedenstellend beschrieben werden. Darüber hinaus wurde die Orientierung von Stahlfasern mithilfe einer bi-direktionalen Kopplung der Gleichungen für das Fließverhalten der Feinkornsysteme mit denen für die Faserorientierung qualitativ gut wiedergegeben.A numerical simulation procedure for the flow and form filling behaviour of cement-based fine grain systems with and without steel fibres was developed based on specifically performed series of flow and filling tests and comparative 2D- and 3D-simulations. The time- and shearrate-dependant behaviour of the fine grain systems was represented by a suitable model based on investigations using a rotational rheometer and applying specifically developed measuring profiles. The numerical simulation was based on this rheological behaviour. Parameter studies and their evaluation by comparison to results of Haegermann and L-Box experiments were used to adjust and validate simulation parameters and simulation models. Thus, the flow and form filling behaviour of the investigated fine grain systems could be described sufficiently with the software platform “Complex Rheology Solver” (CoRheoS). The description of steel fibre orientation by means of a bi-directionally coupling of the equations for flow behaviour of fine grain systems and those for fibre orientation was fairly good

Mustang Daily, October 23, 1998

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.https://digitalcommons.calpoly.edu/studentnewspaper/6350/thumbnail.jp

Business to Consumer Markets on the Semantic Web

Abstract. The emerging Semantic Web technologies have the potential to deeply influence the further development of the Internet Economy. In this paper we propose a scenario based research approach to predict the effects of these new technologies on electronic markets and business models of traders and intermediaries. We develop a concrete scenario for the domain of business to consumer electronic commerce and explain its technical realization. Furthermore, we analyse the potential impacts on market participants and highlight a range of technical and organizational obstacles which have to be solved before semantic technologies can be deployed in an e-business context.

Trustable B2C Markets on the Semantic Web

Semantic Web technologies will deeply influence the further development of the Internet Economy. A major challenge is, however, to find a practical solution for trust problems arising from their deployment in real-world scenarios