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Buchner E.,University of Stuttgart | Buchner E.,Neu-Ulm University | Schwarz W.H.,University of Heidelberg | Schmieder M.,University of Stuttgart | Trieloff M.,University of Heidelberg
Meteoritics and Planetary Science | Year: 2010

40Ar/ 39Ar dating of recrystallized K-feldspar melt particles separated from partially molten biotite granite in impact melt rocks from the approximately 24 km Nördlinger Ries crater (southern Germany) yielded a plateau age of 14.37 ± 0.30 (0.32) Ma (2σ). This new age for the Nördlinger Ries is the first age obtained from (1) monomineralic melt (2) separated from an impact-metamorphosed target rock clast within (3) Ries melt rocks and therewith extends the extensive isotopic age data set for this long time studied impact structure. The new age goes very well with the 40Ar/ 39Ar step-heating and laser probe dating results achieved from mixed-glass samples (suevite glass and tektites) and is slightly younger than the previously obtained fission track and K/Ar and ages of about 15 Ma, as well as the K/Ar and 40Ar/ 39Ar age data obtained in the early 1990s. Taking all the 40Ar/ 39Ar age data obtained from Ries impact melt lithologies into account (data from the literature and this study), we suggest an age of 14.59 ± 0.20 Ma (2σ) as best value for the Ries impact event. © 2010 The Meteoritical Society.


Buchner E.,Neu-Ulm University | Schmieder M.,University of Western Australia | Schmieder M.,Curtin University Australia
Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften | Year: 2013

Palaeoenvironmental considerations suggest that the continental Miocene Ries-Steinheim impact on the Swabian- Franconian Alb plateau, as a rare case on Earth, affected a region dominated by swamplands and lakes. This is supported by the contemporaneous phreatomagmatism of the nearby Urach Volcanic Field, the widespread occurrence of pre- and early post-impact lacustrine and palustrine sediments that overlie deeply karstifi ed, water-saturated Upper Jurassic target limestones, as well as by a subtropical-humid palaeoclimate and a high groundwater level at the time of impact. The characteristics of the Ries ejecta (e.g. accretionary lapilli) display further evidence. Both impact craters became host to crater lakes soon upon impact. A water-saturated, lacustrine-palustrine phreatic impact scenario is also in agreement with the characteristics of proximal Ries and Steinheim impact ejecta, as well as recent numerical modelling results for the Ries impact. © 2013 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.


Schmieder M.,University of Western Australia | Schmieder M.,Curtin University Australia | Buchner E.,Neu-Ulm University
Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften | Year: 2013

The ~3.8 km wide Steinheim Basin (Baden-Württemberg, SW Germany), is formed in a sequence of Triassic to Upper Jurassic sedimentary rocks that support the karstified plateau of the eastern Swabian Alb. It is a well-preserved complex impact structure with a prominent central uplift. Shatter cones from the Steinheim Basin count among the most typically developed shatter cones so far known from terrestrial impact structures and were first described in 1905. In addition to the widely known, well-developed shatter cones in Upper Jurassic limestones of the crater rim domain and the central uplift, shatter cones were also noted in the Middle Jurassic "Eisensandstein" sandstones at the flanks of the central uplift. Recently, we discovered shatter cones in concretionary claystone nodules of the underlying Middle Jurassic "Opalinuston" Formation that was temporarily accessible during water catchment works at the top of the central uplift (Steinhirt). The Steinheim shatter cones are highly variable in their lithologic and structural properties, with well-defined individual or nested cones running either in one main or opposite directions, as well as cones arranged in a "sun-like" pattern radiating outward around concretionary cores within the "Opalinuston" nodules. Our observations suggest that, at least at Steinheim, shock-wave scattering and shatter-cone formation were not dominated by the general impact geometry as commonly stated, but governed by local, micro- to meso-scale target rock effects (e.g. rock inhomogeneities or local impedance). In particular, the "Opalinuston" shatter cones indicate that even comparatively soft clayey lithologies may be conductive to shock waves. © 2013 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.


Reichert M.,University of Ulm | Kolb J.,University of Ulm | Bobrik R.,Detecon AG | Bauer T.,Neu-Ulm University
Proceedings of the ACM Symposium on Applied Computing | Year: 2012

Process-aware information systems (PAISs) need to support personalized views on business processes since different user groups have distinguished perspectives on these processes and related data. Existing PAISs, however, do not provide mechanisms for creating and visualizing such process views. Typically, processes are displayed to users in exactly the same way as originally modeled. This paper presents a flexible approach for creating personalized process views based on parameterizable operations. Respective view-building operations can be flexibly composed in order to hide process information or abstract from it in the desired way. Depending on the chosen parameterization of the operations applied, we obtain process views with more or less relaxed properties (e.g., regarding the degree of information loss or soundness). Altogether, the realized view concept enables a more flexible visualization of large business processes satisfying the needs of different user groups. © 2012 ACM.


Buchner E.,University of Stuttgart | Buchner E.,Neu-Ulm University | Schmieder M.,University of Stuttgart
Meteoritics and Planetary Science | Year: 2010

The 3.8-km Steinheim Basin in SW Germany is a complex impact crater with central uplift hosted by a sequence of Triassic to Jurassic sedimentary rocks. It exhibits a well-preserved crater morphology, intensely brecciated limestone blocks that form the crater rim, as well as distinct shatter cones in limestones. In addition, an impact breccia mainly composed of Middle to Upper Jurassic limestones, marls, mudstones, and sandstones is known from drilling into the impact crater. No impact melt lithologies, however, have so far been reported from the Steinheim Basin. In samples of the breccia that were taken from the B-26 drill core, we discovered small particles (up to millimeters in size) that are rich in SiO2 (-50-wt%) and Al2O3 (-28-wt%), and contain particles of Fe-Ni-Co sulfides, as well as target rock clasts (shocked and unshocked quartz, feldspar, limestone) and droplet-shaped particles of calcite. The particles exhibit distinct flow structures and relicts of schlieren and vesicles. From the geochemical composition and the textural properties, we interpret these particles as mixed silicate melt fragments widely recrystallized, altered, and/or transformed into hydrous phyllosilicates. Furthermore, we detected schlieren of lechatelierite and recrystallized carbonate melt. On the basis of impactite nomenclature, the melt-bearing impact breccia in the Steinheim Basin can be denominated as Steinheim suevite. The geochemical character of the mixed melt particles points to Middle Jurassic sandstones ("Eisensandstein" Formation) that crop out at the center of the central uplift as the source for the melt fragments. © The Meteoritical Society, 2010.


Sturner M.,Neu-Ulm University | Brune P.,Neu-Ulm University
MODELSWARD 2016 - Proceedings of the 4th International Conference on Model-Driven Engineering and Software Development | Year: 2016

Virtual worlds and avatar-based interactive computer games are a hype among consumers and researchers for many years now. In recent years, such games on mobile devices also became increasingly important. However, most virtual worlds require the use of proprietary clients and authoring environments and lack portability, which limits their usefulness for targeting wider audiences like e.g. in consumer marketing or sales. Using mobile devices and client-side web technologies like i.e. JavaScript in combination with a more automatic generation of customer-specific virtual worlds could help to overcome these limitations. Here, model-driven software development (MDD) provides a promising approach for automating the creation of user interface (UI) components for games on mobile devices. Therefore, in this paper an approach is proposed for the model-driven generation of UI components for virtual worlds using JavaScript and the upcoming Famo.us framework. The feasibilty of the approach is evaluated by implementing a proof-of-concept scenario. © Copyright 2016 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.


Boll F.,Neu-Ulm University | Brune P.,Neu-Ulm University
Procedia Computer Science | Year: 2016

Most developed countries currently face a demographic change towards an aging society. In this respect, the so-called transition age between 55 and 75 is crucial for individual health and wellbeing, since it usually is connected with the transition from work life to retirement. This leads to a fundamental change in daily routines and social life, often causing mental or physical health problems. Online Social Networks have been studied for some time already as a means for supporting social inclusion of elderly people. On the other hand, by healthcare providers and welfare organizations an increasing number of support services for elderly people are or will be provided also online in the future. However, the combination of both aspects in order to provide a more holistic online support for elderly people, in particular to those between 55-75, has not been discussed so far. Therefore, in this paper we argue in favor of the concept of an integrated online service and social network for elderly people and present an outline of its intended functionality. © 2016 The Authors.


Ebbers F.,Neu-Ulm University | Brune P.,Neu-Ulm University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Knowledge-based authentication with username and password still is the predominant authentication method in practice. As the number of online accounts increases, users need to remember more and more passwords, leading to the choice of better memorable but insecure passwords. Therefore, it is important to take into account the users’ behavior to improve IT security. While gamification has been proposed as a concept to influence users’ behavior in various domains, it has not been applied to user authentication methods so far. Therefore, in this paper an approach for a gamified authentication method is presented. Using a prototype implementation, a qualitative evaluation in an empirical study is performed. Results illustrate the general feasibility of the proposed approach. © Springer International Publishing Switzerland 2016.


Wiedemann A.,Neu-Ulm University | Weeger A.,Neu-Ulm University
AMCIS 2016: Surfing the IT Innovation Wave - 22nd Americas Conference on Information Systems | Year: 2016

The design of an IT department received much attention during the last years. CIOs and IT managers still have a great interest how they can set up their IT department. Previous research discusses various key characteristics or even delivers archetypes of the IT department. However, a synoptic view of the screws CIOs can set, is still missing. Subsequently, the aim of the present paper is to synthesize existing literature in order to gain an overview about the key characteristics of an IT department. To that end, a systematic literature review was conducted. The paper contributes a set of nine characteristics grouped along three dimensions: organizational, technological, and human dimension. The nature of the IT artifacts deployed by the IT department as well as the real net output ratio of the IT function were identified as important characteristics, which were not addressed by existing typologies of IT departments.


Boll F.,Neu-Ulm University | Brune P.,Neu-Ulm University
Procedia Computer Science | Year: 2015

While applications and user interfaces (UI) for elderly people have been discussed by various authors, the specific requirements of people in the transition age from work life to retirement (55-75 years) have not been analyzed in detail yet. Therefore, in this paper we present results from a qualitative empirical analysis within this age group, evaluate their specific usage behavior and system requirements and derive basic UI design guidelines from it. The results indicate that indeed this age group differs in its requirements from older people (75+) mainly considered in the existing literature. © 2015 The Authors.

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