Structural Correctness of Planning Processes in Building Engineering

The planning of projects in building engineering is a complex process which is characterized by a dynamical composition and many modifications during the definition and execution time of processes. For a computer-aided and network-based cooperation a formal description of the planning process is necessary. In the research project “Relational Process Modelling in Cooperative Building Planning” a process model is described by three parts: an organizational structure with participants, a building structure with states and a process structure with activities. This research project is part of the priority program 1103 “Network-Based Cooperative Planning Processes in Structural Engineering” promoted by the German Research Foundation (DFG). Planning processes in civil engineering can be described by workflow graphs. The process structure describes the logical planning process and can be formally defined by a bipartite graph. This structure consists of activities, transitions and relationships between activities and transitions. In order to minimize errors at execution time of a planning process a consistent and structurally correct process model must be guaranteed. This contribution considers the concept and the algorithms for checking the consistency and the correctness of the process structure

The Added Value of Large-Eddy and Storm-Resolving Models for Simulating Clouds and Precipitation

More than one hundred days were simulated over very large domains with fine (0.156 km to 2.5 km) grid spacing for realistic conditions to test the hypothesis that storm (kilometer) and large-eddy (hectometer) resolving simulations would provide an improved representation of clouds and precipitation in atmospheric simulations. At scales that resolve convective storms (storm-resolving for short), the vertical velocity variance becomes resolved and a better physical basis is achieved for representing clouds and precipitation. Similarly to past studies we found an improved representation of precipitation at kilometer scales, as compared to models with parameterized convection. The main precipitation features (location, diurnal cycle and spatial propagation) are well captured already at kilometer scales, and refining resolution to hectometer scales does not substantially change the simulations in these respects. It does, however, lead to a reduction in the precipitation on the time-scales considered – most notably over the ocean in the tropics. Changes in the distribution of precipitation, with less frequent extremes are also found in simulations incorporating hectometer scales. Hectometer scales appear to be more important for the representation of clouds, and make it possible to capture many important aspects of the cloud field, from the vertical distribution of cloud cover, to the distribution of cloud sizes, and to the diel (daily) cycle. Qualitative improvements, particularly in the ability to differentiate cumulus from stratiform clouds, are seen when one reduces the grid spacing from kilometer to hectometer scales. At the hectometer scale new challenges arise, but the similarity of observed and simulated scales, and the more direct connection between the circulation and the unconstrained degrees of freedom make these challenges less daunting. This quality, combined with already improved simulation as compared to more parameterized models, underpins our conviction that the use and further development of storm-resolving models offers exciting opportunities for advancing understanding of climate and climate change

Abstracts from the 8th International Conference on cGMP Generators, Effectors and Therapeutic Implications

This work was supported by a restricted research grant of Bayer AG

Process modelling in civil engineering based on hierarchical Petri nets

Process modeling is a central aspect for the support of the network-based coordination of planning processes in civil engineering. Hereby, the planning processes are characterized by some significant aspects, especially the great complexity and the dynamical behavior. To master both, the complexity and the refinement of planning processes, appropriate hierarchical structured process models are necessary. This contribution provides a Petri Net based approach for hierarchical process modelling. The focus is on the formalism to ensure the structural and behavioural correctness of the hierarchical process models and a prototypic software implementation for hierarchical process modelling in civil engineering

Processes Modelling in Civil Engineering based on Hierarchical Petri Nets

ABSTRACT: Process modeling is a central aspect for the support of the network-based coordination of planning processes in civil engineering. Hereby, the planning processes are characterized by some significant aspects, especially the great complexity and the dynamical behavior. To master both, the complexity and the refinement of planning processes, appropriate hierarchical structured process models are necessary. This contribution provides a Petri Net based approach for hierarchical process modelling. The focus is on the formalism to ensure the structural and behavioural correctness of the hierarchical process models and a prototypic software implementation for hierarchical process modelling in civil engineering.

Energieflussanalyse Schleswig-Holstein: im Auftrag des Ministers fuer Wirtschaft und Verkehr des Landes Schleswig-Holstein

Available from Bibliothek des Instituts fuer Weltwirtschaft, ZBW, Duesternbrook Weg 120, D-24105 Kiel / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Operation mechanism of high performance organic permeable base transistors with an insulated and perforated base electrode

The organic permeable base transistor is a vertical transistor architecture that enables high performance while maintaining a simple low-resolution fabrication. It has been argued that the charge transport through the nano-sized openings of the central base electrode limits the performance. Here, we demonstrate by using 3D drift-diffusion simulations that this is not the case in the relevant operation range. At low current densities, the applied base potential controls the number of charges that can pass through an opening and the opening is the current limiting factor. However, at higher current densities, charges accumulate within the openings and in front of the base insulation, allowing for an efficient lateral transport of charges towards the next opening. The on-state in the current-voltage characteristics reaches the maximum possible current given by space charge limited current transport through the intrinsic semiconductor layers. Thus, even a small effective area of the openings can drive huge current densities, and further device optimization has to focus on reducing the intrinsic layer thickness to a minimum

Flexible Electronic Circuits - Vertical Transistors and Passive Devices

<p>Poster shown on the European Conference on Molecular Electronics ECME 2017 in Dresden.<br></p><p>Organic large area electronics have the potential to enable fully flexible applications. This requires efficient transistors on flexible substrates as well as capacitors, inductors, and resistors to complete an electrical circuit.</p><p>We operate Organic Permeable Base Transistors (OPBT) on polymer substrates to combine impressive transistor characteristics, facile manufacturing techniques and mechanical flexibility. Large current densities and on/off-ratios are achieved with simple shadow mask structuring well known from OLED technology. Currently our flexible devices reach on/off-ratios exceeding 10⁶ and current densities above 1 A/cm².<br></p>Thin-film capacitors and inductors are produced to fit the needs of a transmitter circuit that we aim to use for indoor wireless localization applications

Creating NFDI-Wide Basic Services in a World of Specific Domains

Schimmler S, Altenhöner R, Bernard L, et al. Base4NFDI - Basic Services for NFDI. Proceedings of the Conference on Research Data Infrastructure. 2023;1.NFDI is a German initiative to set up research data infrastructures across all disciplines. Within NFDI, Base4NFDI is a unique joint effort of all NFDI consortia to develop and deploy NFDI-wide basic services. Within this talk, we will give an overview of Base4NFDI, especially its structures and emerging work program, and inform about ways to participate and contribute ideas for potential basic services