van Otterloo J.,Monash University |
Cas R.A.F.,Monash University |
Bulletin of Volcanology | Year: 2013
The ∼5 ka Mt. Gambier Volcanic Complex in the Newer Volcanics Province, Australia is an extremely complex monogenetic, volcanic system that preserves at least 14 eruption points aligned along a fissure system. The complex stratigraphy can be subdivided into six main facies that record alternations between magmatic and phreatomagmatic eruption styles in a random manner. The facies are (1) coherent to vesicular fragmental alkali basalt (effusive/Hawaiian spatter and lava flows); (2) massive scoriaceous fine lapilli with coarse ash (Strombolian fallout); (3) bedded scoriaceous fine lapilli tuff (violent Strombolian fallout); (4) thin-medium bedded, undulating very fine lapilli in coarse ash (dry phreatomagmatic surge-modified fallout); (5) palagonite-altered, cross-bedded, medium lapilli to fine ash (wet phreatomagmatic base surges); and (6) massive, palagonite-altered, very poorly sorted tuff breccia and lapilli tuff (phreato-Vulcanian pyroclastic flows). Since most deposits are lithified, to quantify the grain size distributions (GSDs), image analysis was performed. The facies are distinct based on their GSDs and the fine ash to coarse+fine ash ratios. These provide insights into the fragmentation intensities and water-magma interaction efficiencies for each facies. The eruption chronology indicates a random spatial and temporal sequence of occurrence of eruption styles, except for a "magmatic horizon" of effusive activity occurring at both ends of the volcanic complex simultaneously. The eruption foci are located along NW-SE trending lineaments, indicating that the complex was fed by multiple dykes following the subsurface structures related to the Tartwaup Fault System. Possible factors causing vent migration along these dykes and changes in eruption styles include differences in magma ascent rates, viscosity, crystallinity, degassing and magma discharge rate, as well as hydrological parameters. © 2013 Springer-Verlag Berlin Heidelberg.
Becker C.,University of Toronto |
Faria L.,Innovation |
Duretec K.,Vienna University of Technology
OCLC Systems and Services | Year: 2014
Purpose-Preservation environments such as repositories need scalable and context-aware preservation planning and monitoring capabilities to ensure continued accessibility of content over time. This article identifies a number of gaps in the systems and mechanisms currently available and presents a new, innovative architecture for scalable decision-making and control in such environments.Design/methodology/approach-The paper illustrates the state of the art in preservation planning and monitoring, highlights the key challenges faced by repositories to provide scalable decision-making and monitoring facilities, and presents the contributions of the SCAPE Planning and Watch suite to provide such capabilities.Findings-The presented architecture makes preservation planning and monitoring context-aware through a semantic representation of key organizational factors, and integrates this with a business intelligence system that collects and reasons upon preservation-relevant information. Research limitations/implications-The architecture has been implemented in the SCAPE Planning and Watch suite. Integration with repositories and external information sources provide powerful preservation capabilities that can be freely integrated with virtually any repository. Practical implications-The open nature of the software suite enables stewardship organizations to integrate the components with their own preservation environments and to contribute to the ongoing improvement of the systems.Originality/value-The paper reports on innovative research and development to provide preservation capabilities. The results enable proactive, continuous preservation management through a context-aware planning and monitoring cycle integrated with operational systems. © Emerald Group Publishing Limited.
Ristov S.,Ss. Cyril and Methodius University of Skopje |
Gusev M.,Ss. Cyril and Methodius University of Skopje |
Armenski G.,Ss. Cyril and Methodius University of Skopje |
IEEE Global Engineering Education Conference, EDUCON | Year: 2014
This paper describes the development of a scalable and elastic e-Assessment solution deployed on the OpenStack open source cloud. The solution activates virtual machine instances with a particular size for each assessment according to the number of students that should be assessed, in order to achieve sustainable performance. The system architecture and organization of this solution has been recently published . We have improved this design by introducing two new agents: the Assessment Generation Agent and Assessment Commit Agent. These modules improve the solution by enabling strategies in the test generation process and preventing situations when the test results are not updated correctly. The developed solution has also enabled several new features, such as introducing complex questions with several learning objectives, better presentation of results, and developed a new method to eliminate guessing in multiple choice questions as an advantage in the defined negative marking schema. We also discuss several new challenges that occur within the cloud deployment, including reference to delivery of open courses to massive number of students. © 2014 IEEE.
Frederiksen P.D.,University of Aarhus |
Hammershoj M.,University of Aarhus |
Bakman M.,Arla Foods |
Andersen P.N.,Arla Foods |
And 3 more authors.
Dairy Science and Technology | Year: 2011
The paper describes a study on the variation of coagulation properties in individual cow's milk measured by a novel free oscillation rheometry-based method. The work is part of a study on the occurrence and underlying causes of poorly and even non-coagulating (NC) milk in Denmark, and based on that, the paper reports on the frequency of non- and poorly coagulating milk in a herd of the three main Danish dairy breeds, Jersey, Danish red (RDM), and Danish Holstein-Friesian (SDM). The cows were milked by automatic milking. The rennet coagulation time, the coagulum firmness by storage modulus G', and the curd firming rate of fresh skimmed milk were determined. More than 20% of the milk samples exhibited poor coagulation properties by the criteria set. Of these, the 17% resulted in a weak coagulum after addition of rennet, while another 3% were due to NC milk that did not aggregate to form a curd within the 40 min of measurement. Milk from Jersey cows exhibited superior coagulation properties when compared to milk from SDM and RDM cows. The dependence of curd firming rate on protein concentration was investigated, and found to depend on milk protein concentration to the power of three, emphasizing the importance of protein interactions, and not just the protein concentration itself. The paper gives a basis for the subsequent selection of NC milk samples with theaim to look in more detail for the underlying reasons for the phenomenon of NC milk. © INRA and Springer Science+Business Media B.V. 2011.
Gueimonde M.,Institute Productos Lacteos Of Asturias Csic |
Florez A.B.,Institute Productos Lacteos Of Asturias Csic |
Van Hoek A.H.A.M.,Wageningen University |
Van Hoek A.H.A.M.,National Institute for Public Health and the Environment RIVM |
And 4 more authors.
Applied and Environmental Microbiology | Year: 2010
All strains of Bifidobacterium animalis subsp. lactis described to date show medium level resistance to tetracycline. Screening of 26 strains from a variety of sources revealed the presence of tet (W) in all isolates. A transposase gene upstream of tet(W) was found in all strains, and both genes were cotranscribed in strain IPLAIC4. Mutants with increased tetracycline resistance as well as tetracycline-sensitive mutants of IPLAIC4 were isolated and genetically characterized. The native tet (W) gene was able to restore the resistance phenotype to a mutant with an alteration in tet(W) by functional complementation, indicating that tet(W) is necessary and sufficient for the tetracycline resistance seen in B. animalis subsp. lactis Copyright © 2010, American Society for Microbiology. All Rights Reserved.