Effekte der Dünger-N-Form auf das Wurzelwachstum von Winterweizen (Triticum aestivum L.) unter Freilandbedin-gungen auf einem Schwarzerrde-Standort

Auf einem Schwarzerde-Standort konnten in den drei Versuchsjahren 2014–2016 keine eindeutigen Effekte verschiedener Dünger-N-Formen auf die Wurzelentwicklung von Winterweizen erfasst werden. Tendenziell förderte eine NH4+ basierende N Düngung das Wurzelwachstum während des Schossens (BBCH 37), wohingegen sich eine NO3- betonte N-Düngung positiv auf die Wurzelentwicklung zwischen dem Schossen (BBCH 37) und der Blüte (BBCH 65) der Pflanzen auswirkte. Ein Verzicht auf N-Dünger erhöhte im Trend die Durchwurzelung zu Beginn des Schossens (BBCH 32), führte jedoch zu einem teilweise statistisch abgesicherten geringen Wurzelwachstum im Vegetationsverlauf

Das Verbundprojekt StaPlaRes: N-Stabilisierung und wurzelnahe Platzierung als innovative Technologien zur Optimierung der Ressourceneffizienz bei der Harnstoff-Düngung

Das F&E-Verbundvorhaben StaPlaRes entwickelt, untersucht und bewertet neuartige Technologien im Rahmen der Harnstoff (HS)-Düngung mit dem Ziel größtmöglicher Ressourceneffizienz und Umweltschonung

Querying as an enabling technology in software reengineering

In this paper it is argued that different kinds of reengineering technologies can be based on querying. Several reengineering technologies are presented as being integrated into a technically oriented reengineering taxonomy. The usefulness of querying is pointed out with respect to these reengineering technologies. To impose querying as a base technology in reengineering examples are given with respect to the EER/GRAL approach to conceptual modeling and implementation. This approach is presented together with GReQL as its query part. The different reengineering technologies are finally reviewed in the context of the GReQL query facility. (orig.)Available from TIB Hannover: RO 6844(1998,22) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Program comprehension in multi-language systems

This paper presents an approach to program comprehension in multi-language systems. Such systems are characterized by a high amount of source codes in various languages for programming, database definiton and job control. Coping with those systems requires the references crossing the language boundaries to be analysed. Using the EER/GRAL approach to graph-based conceptual modeling, models representing relevant aspects of single language are built and integrated into a common conceptual model. Since conceptual modeling focusses on specific problems, the integrated model presented here is especially tailored to multi-language aspects. Software systems are parsed and represented according to this conceptual model and queried by using a powerful graph query mechanism. This allows multi-language cross references to be easily retrieved. The multi-language conceptual model and the query facilities have been developed in cooperation with the maintenance programmers at an insurance company within the GUPRO project. (orig.)Available from TIB Hannover: RO 6844(1998,4) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Transformation-based bottom-up computation of the well-founded model

We present a bottom-up algorithm for the computation of the well-founded model of non-disjunctive logic programs. Our method is based on the elementary program transformations studied by BRASS and DIX [BD94, BD97, BD98a]. However, their 'residual program' can grow to exponential size, whereas for function-free programs our 'program remainder' is always polynomial in the size of the extensional database (EDB). As in the SLG-resolution of CHEN and WARREN [CW93, CW96, CSW95], we do not only delay negative but also positive literals if they depend on delayed negative literals. When disregarding goal-directedness, which needs additional concepts, our approach can be seen as a simplified bottom-up version of SLG-resolution applicable to range-restricted Datalog programs. Since our approach is also closely related to the alternating fixpoint procedure [VG89, VG93], it is possibly serve as a basis for an integration of the resolution-based, fixpoint-based, and transformation-based evaluation methods. (orig.)Available from TIB Hannover: RO 6844(1998,15) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Testbaggerung im Kloecknerhafen Bremen mit Hopperbagger OSTSEE Ergebnissse der Schwebstoff- und Truebungsmessungen

Available from TIB Hannover: F00B359+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman