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Journal of Environmental Sciences 2019年第1期31卷 54-63页

作者： Ariel E.Turcios Jutta Papenbrock Institute of Botany Leibniz University Hannover

The biofiltering capacity, distribution patterns and degradation of the antimicrobial sulfamethazine(SMT) by halophyte Chenopodium quinoa under hydroponic conditions and its further biodegradation through anaerobic digestion were evaluated. C. quinoa was cultivated for a complete life cycle under different concentrations of SMT(0, 2 and 5 mg/L) and sodium chloride(0 and 15 g/L). C. quinoa is able to uptake and partially degrade SMT. The higher the SMT concentration in the culture medium, the higher the SMT content in the plant tissue. SMT has different distribution patterns within the plant organs, and no SMT is found in the *** crop residues containing SMT have a great potential to produce methane through anaerobic digestion and, in addition, SMT is further biodegraded. The highest specific methane yields are obtained using crop residues of the plants cultivated in the presence of salt and SMT with concentrations between 0 and 2 mg/L.

关键词： Anaerobic digestion Chenopodium quinoa FISH analysis Phytoremediation Sulfamethazine biodegradation

Gottfried Konecny:The photogrammetric and remote sensing trend setter

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Geo-Spatial Information Science 2021年第1期24卷 13-21,I0004页

作者： Karsten Jacobsen Institute of Photogrammetry and Geoinformation Leibniz University HannoverHannoverGermany

There are various publications on the 90th birthday of Gottfried *** involvement in the International Society for Photogrammetry and Remote Sensing(ISPRS)is particularly described by ***,his forward-oriented impulses in research and development at the former Institute for Photogrammetry and Engineering Survey of the(Technical)university of Hannover,today Institute for Photogrammetry and Geoinformation,leibniz university Hannover,and some of his activities supporting developing and other countries by given shortterm courses are *** Konecny was always one of the first in pushing new *** the analytical plotter AP/C-3,he introduced analytical photogrammetry in *** on his experience with this not really operational version,he induced the company Zeiss to develop the first really operational analytical plotter Planicomp,which resulted in the end of analog photogrammetric devices and their *** the invitation of Gilbert Hobrough,a mainly hardware-based image correlator was developed for the AP/C-3 in Hannover which anticipated many of today’s *** Konecny initiated remote sensing in *** on his proposal with the Metric Camera Flight on Spacelab,the then highest resolution civil stereoscopic space images available were *** limited computer performance at his institute,a digital stereo plotter was developed,using hardware components from the cooperating Swedish company Context Vision,long before digital stereo workstations with increased and affordable computer capacity were ***,in the area of GIS,he too,pushed development in collaboration with companies and *** before the end of his time as head of the institute,and more so after he became emeritus professor,he started a series of educational workshops,particularly in developing countries,but also other countries,to support the development of photogrammetry,remote sensing and *** prom

关键词： initiated gramme hardware

Trajectory analysis at intersections for traffic rule identification

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Geo-Spatial Information Science 2021年第1期24卷 75-84,I0010页

作者： Chenxi Wang Stefania Zourlidou Jens Golze Monika Sester Institute of Cartography and Geoinformatics Leibniz University HannoverHannoverGermany

In this paper,we focus on trajectories at intersections regulated by various regulation types such as traffic lights,priority/yield signs,and right-of-way *** test some methods to detect and recognize movement patterns from GPS trajectories,in terms of their geometrical and spatio-temporal *** particular,we first find out the main paths that vehicles follow at such *** then investigate the way that vehicles follow these geometric paths(how do they move along them).For these scopes,machine learning methods are used and the performance of some known methods for trajectory similarity measurement(DTW,Hausdorff,and Fréchet distance)and clustering(Affinity propagation and Agglomerative clustering)are compared based on clustering ***,the movement behavior observed at six different intersections is analyzed by identifying certain movement patterns in the speed-and time-profiles of *** show that depending on the regulation type,different movement patterns are observed at *** finding can be useful for intersection categorization according to traffic *** practicality of automatically identifying traffic rules from GPS tracks is the enrichment of modern maps with additional navigation-related information(traffic signs,traffic lights,etc.).

关键词： Traffic rules traffic regulators GPS trajectories intersection classification speed-profiles clustering similarity measures

THE HP-VERSION OF BEM-FAST CONVERGENCE,ADAPTIVITY AND EFFICIENT PRECONDITIONING

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Journal of Computational Mathematics 2009年第2期27卷 348-359页

作者： Ernst P.Stephan Institute of Applied Mathematics Leibniz University HannoverGermany

In this survey paper we report on recent developments of the hp-version of the boundary element method （BEM）. As model problems we consider weakly singular and hypersingular integral equations of the first kind on a planar, open surface. We show that the Galerkin solutions （computed with the hp-version on geometric meshes） converge exponentially fast towards the exact solutions of the integral equations. An hp-adaptive algorithm is given and the implementation of the hp-version BEM is discussed together with the choice of efficient preconditioners for the ill-conditioned boundary element stiffness matrices. We also comment on the use of the hp-version BEM for solving Signorini contact problems in linear elasticity where the contact conditions are enforced only on the discrete set of Gauss-Lobatto points. Numerical results are presented which underline the theoretical results.

关键词： hp-version of the boundary element method Adaptive refinement Preconditioning Signorini contact

Ink-structing the future of vascular tissue engineering:a review of the physiological bioink design

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Bio-Design and Manufacturing 2024年第2期7卷 181-205页

作者： Judith Synofzik Sebastian Heene Rebecca Jonczyk Cornelia Blume Institute for Technical Chemistry Leibniz University Hannover30167 HannoverGermany

Three-dimensional(3D)printing and bioprinting have come into view for a plannable and standardizable generation of implantable tissue-engineered constructs that can substitute native tissues and *** tissue-engineered structures are intended to integrate with the patient’s *** tissue engineering(TE)is relevant in TE because it supports the sustained oxygenization and nutrition of all tissue-engineered *** have a specific role,representingthenecessarymedium for printability and vascular cell *** review aims to understand the requirements for the design of vascular ***,an in-depth analysis of vascular cell interaction with their native environment must be gained.A physiological bioink suitable for a tissue-engineered vascular graft(TEVG)must not only ensure good printability but also induce cells to behave like in a native vascular vessel,including self-regenerative and growth *** review describes the general structure of vascular walls with wall-speciﬁc cell and extracellular matrix(ECM)components and biomechanical properties and ***,the physiological role of vascular ECM components for their interaction with vascular cells and the mode of interaction is *** currently available or imaginable bioinks are described from physiological matrix proteins to nonphysiologically occurring but natural chemical compounds useful for vascular *** physiological performance of these bioinks is evaluated with regard to biomechanical properties postprinting,with a view to current animal studies of 3D printed vascular ***,the main challenges for further bioink development,suitable bioink components to create a self-assembly bioink concept,and future bioprinting strategies are *** concepts are discussed in terms of their suitability to be part of a TEVG with a high potential for later clinical use.

关键词： Vascular wall histology Vascular cells Microenvironment Extracellular matrix Cell–matrix interaction Bioink Printability

Deep learning for geometric and semantic tasks in photogrammetry and remote sensing

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Geo-Spatial Information Science 2020年第1期23卷 10-19页

作者： Christian Heipke Franz Rottensteiner Institute of Photogrammetry and GeoInformation(PI) Leibniz University HannoverHannoverGermany

During the last few years,artificial intelligence based on deep learning,and particularly based on convolutional neural networks,has acted as a game changer in just about all tasks related to photogrammetry and remote *** have shown partly significant improvements in many projects all across the photogrammetric processing chain from image orientation to surface reconstruction,scene classification as well as change detection,object extraction and object tracking and recognition in image *** paper summarizes the foundations of deep learning for photogrammetry and remote sensing before illustrating,by way of example,different projects being carried out at the Institute of Photogrammetry and GeoInformation,leibniz university Hannover,in this exciting and fast moving field of research and development.

关键词： Deep learning machine learning convolutional neural networks(CNN) example project from IPI

Hydromechanical model for hydraulic fractures using XFEM

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Frontiers of Structural and Civil Engineering 2019年第1期13卷 240-249页

作者： Bo HE Faculty of Mechanical Engineering Leibniz University of Hanover30167 HannoverGermany

In this study,a hydromechanical model for fluid flow in fractured porous media is *** assume viscous fluids and the coupling equations are derived from the mass and momentum balance equations for saturated porous *** fluid flow through discrete cracks will be modelled by the extended finite element method and an implicit time integration *** also present a consistent linearization of the underlying non-linear discrete *** are solved by the Newton-Raphson iteration procedure in combination with a line ***, the model is extended to includes crack ***,examples are presented to demonstrate the versatility and efficiency of this two-scale hydromechanical *** results suggest that the presence of the fracture in a deforming, porous media has great impact on the fluid flow and deformation patterns.

关键词： multi-phase medium porous fracture multi-scale method

Comparative analysis of sol-air temperature in typical open and semi-closed courtyard spaces

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Building Simulation 2022年第6期15卷 957-973页

作者： Aysan Forouzandeh Department of Civil Engineering and Geodetic Science Institute for building physicsLeibniz UniversityHanoverGermany

The building cooling load is calculated in most standards using the sol-air temperature(T_(sol-air)),which depends on the surface properties and the building *** study presents an experimental and numerical analysis to find a relationship between the aspect ratio of the courtyard and the T_(sol-air) at different height ***,the influence of the surface reflection factor on the T_(sol-air) is *** results show that the T_(sol-air) inside the courtyard differs compared to the usual outside *** difference is increased by increasing the aspect ratio of the courtyard and can reach up to 60°C at low levels of the deep *** is also found that the courtyard geometry is much more important than the thermal behavior of the materials and the T_(sol-air) within the deep courtyard is less affected by the reflection factor of materials.

关键词： sol-air temperature thermal conditions near facade microclimate semi-closed courtyard space

Influence of the wakes of rotating spokes on the performance of a turbine exhaust diffuser

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Journal of Thermal Science 2010年第3期19卷 206-210页

作者： M.Kuschel J.R.Seume Institute of Turbomachinery and Fluid Dynamics Leibniz University HannoverD-30167 HannoverGermany

The design of turbine exhaust diffusers is still commonly based upon conservative design charts which do not consider the influence of the components installed upstream such as the last turbine *** on investigations with different spoke wheels which approximate the blade wakes of the last turbine stage,the influence of a rotating bladed disc on the flow in a exhaust diffuser is *** pressure recovery for an annual diffuser with 15° half cone angle and the 5 mm spoke wheel used in the model test is very high and nearly independent on the rotational speed and the corresponding Strouhal *** a 20° annual diffuser,the pressure recovery increases with Strouhal number

关键词： turbine exhaust diffuser rotating wakes separation

Entropy dominated behaviors of confined polymer-nanoparticle composites

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Chinese Physics B 2012年第11期21卷 513-517页

作者：曹学正 Merlitz Holger Sommer Jens-Uwe 吴晨旭 Department of Physics and ITPA Xiamen University leibniz-Institut fr Polymerforschung Dresden

Stretched polymers will lose their possible configurations if they are mixed with nanoparticles or touch a hard wall, which leads to a strong depletion attraction responsible for the enrichment of nanoparticles near substrates. Moreover, it is found that there exists a sacrifice mechanism in confined pure polymer samples or polymer-nanoparticle mixtures, that part of the polymers, in order to reach a minimum free energy for the total system, are adsorbed on hard walls even though they lose their conformation. The current study provides a simple yet effective approach for the design of thin polymer composites.

关键词： conformation entropy nanoparticle depletion attraction thin polymer layer