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pde2path – A Matlab Package for Continuation and Bifurcation in 2D Elliptic Systems

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维普期刊数据库

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Numerical Mathematics(Theory,Methods and Applications) 2014年第1期7卷 58-106页

作者： hannes uecker Daniel Wetzel Jens D.M.Rademacher Institut für Mathematik Universität Oldenburg26111 OldenburgGermany Universität Bremen Fachbereich MathematikPostfach 33044028359 BremenGermany

pde2path is a free and easy to use Matlab continuation/bifurcation package for elliptic systems of PDEs with arbitrary many components,on general two dimensional domains,and with rather general boundary *** package is based on the FEM of the Matlab pdetoolbox,and is explained by a number of examples,including Bratu’s problem,the Schnakenberg model,Rayleigh-Bénard convection,and von Karman plate *** serve as templates to study new problems,for which the user has to provide,via Matlab function files,a description of the geometry,the boundary conditions,the coefficients of the PDE,and a rough initial guess of a *** basic algorithm is a one parameter arclength-continuation with optional bifurcation detection and *** calculations,error control and mesh-handling,and some elementary timeintegration for the associated parabolic problem are also *** continuation,branch-switching,plotting etc are performed via Matlab command-line function calls guided by the AUTO *** software can be downloaded from ***/*** ker/pde2path,where also an online documentation of the software is provided such that in this paper we focus more on the mathematics and the example systems.

关键词： Elliptic systems continuation and bifurcation finite element method

Automatic object annotation in streamed and remotely explored large 3D reconstructions

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Computational Visual Media 2021年第1期7卷 71-86页

作者： Benjamin Holler Annette Mossel hannes Kaufmann Institute of Visual Computing and Human-Centered Technology Vienna University of TechnologyFavoritenstraβe 9-11/193/06A-1040 ViennaAustria

We introduce a novel framework for 3 D scene reconstruction with simultaneous object annotation,using a pre-trained 2 D convolutional neural network(CNN),incremental data streaming,and remote exploration,with a virtual reality *** enables versatile integration of any 2 D box detection or segmentation *** integrate new approaches to(i)asynchronously perform dense 3 D-reconstruction and object annotation at interactive frame rates,(ii)efficiently optimize CNN results in terms of object prediction and spatial accuracy,and(iii)generate computationally-efficient colliders in large triangulated3 D-reconstructions at run-time for 3 D scene *** method is novel in combining CNNs with long and varying inference time with live 3 D-reconstruction from RGB-D camera *** further propose a lightweight data structure to store the 3 D-reconstruction data and object annotations to enable fast incremental data transmission for real-time exploration with a remote client,which has not been presented *** framework achieves update rates of 22 fps(SSD Mobile Net)and 19 fps(Mask RCNN)for indoor environments up to 800 m^(3).We evaluated the accuracy of 3 D-object *** work provides a versatile foundation for semantic scene understanding of large streamed3 D-reconstructions,while being independent from the CNN’s processing *** code is available for non-commercial use.

关键词： dense 3D reconstruction object detection CNN distributed virtual reality

Vulnerability and Resilience Research:A Critical Perspective

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International Journal of Disaster Risk Science 2014年第1期5卷 86-87页

作者： hannes Taubenbock Christian Geiв German Remote Sensing Data Center German Aerospace CenterOberpfaffenhofen82234 WesslingGermany

‘‘Vulnerability’’and‘‘resilience’’are terms of such broad conceptual meaning as to be almost useless for careful scientific communication,except as rhetorical indicators of areas of greatest *** is a reflection of the complexity of their meaning,an uncoordinated search among different fields for a common understanding,and maybe the difficulty of systematizing these complicated issues among the various involved parties.

关键词： Resilience difficulty coordinated

The role of GI-supported methods in crisis management

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International Journal of Digital Earth 2010年第4期3卷 340-354页

作者： hannes Seppänen Kirsi Virrantaus Department of Surveying Aalto University School of Science and TechnologyP.O.Box 11200Aalto 00076Finland

Crisis and disaster management has become an important research field in GIS during recent *** assessment and situation picture-related work are particularly important areas of *** are distinct phases in different crises;these can be roughly divided into mitigation,preparedness,response,and *** this paper a general classification of methods in each phase is given with examples on recent or ongoing research *** framework is based on literature and experiences from crisis and disaster-related *** case studies are based on those *** goal is to clarify the role and usability of various GI-supported methods in the crisis management process by outlining a theoretical framework and presenting examples of the developed *** increasing amount of spatially related geographic information is a huge potential to the GI analysis and modeling methods;the concept of digital earth is the underlying mainstream that gives lots of promise to the research and development work in this field.

关键词： geo-spatial science geoinformatics GIS digital earth crisis management

Global geospatial data from Earth observation:status and issues

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International Journal of Digital Earth 2017年第4期10卷 328-341页

作者： Ian Dowman hannes I.Reuter Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondonUK Gisexperts TrierGermany

Data covering the whole of the surface of the Earth in a homogeneous and reliable manner has been accumulating over many *** type of data became available from meteorological satellites from the 1960s and from Earth-observing satellites at a small scale from the early 1970s but has gradually accumulated at larger scales up to the present day when we now have data covering many environmental themes at large *** data have been used to generate information which is presented in the form of global data *** paper will give a brief introduction to the development of Earth observation and to the organisations and sensors which collect data and produce global geospatial data *** of accessing global data sets will set out the types of data available that will be *** elevation models are discussed in a separate section because of their importance in georeferencing image data as well as their application to analysis of thematic *** paper will also examine issues of availability,accuracy,validation and reliability and will look at future challenges.

关键词： Global data sets validation standardisation Earth observation

Nervous System 1 Har/Cdr

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Effects of external temperature and dead volume on laboratory measurements of pore pressure and injected volume in a rock fracture

丛书名： Cambridge Illustrated Surgical Pathology

2009年

作者： hannes Vogel

ISBN: (纸本)9780521881616

Nervous System is the new atlas-oriented resource in central nervous system pathology. As the fourth book in the Cambridge Illustrated Surgical Pathology series it is the most comprehensive text of methods utilized by pathologists to accurately diagnose diseases affecting the brain, meninges, and spinal cord. The book is a richly illustrated guide to surgical neuropathology, including all primary brain tumors as well as others arising near the nervous system that are also within the scope of neurosurgical practice. Numerous neuroimaging examples are provided to underscore the importance of knowing the basics of radiographic studies in accurately diagnosing CNS pathology. A complete spectrum of nonneoplastic neuropathological entities is also illustrated, including infectious, inflammatory, and epilepsy-related neuropathology. Additional chapters address intraoperative consultation and frozen sections, as well as CSF cytopathology.

关键词： surgical pathology illustrated cambridge system nervousAnatomy Basic Sciences Medical Professional & Technical

来源：畅想之星图书光盘版（南... 评论

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畅想之星图书光盘版（南通市图书馆镜像）

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1461-1469页

作者： Yinlin Ji Christian Kluge hannes Hofmann Guido Blöcher Helmholtz Centre Potsdam GFZ German Research Centre for GeosciencesPotsdam14473Germany State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou221116China

The accurate evaluation of pore pressure and injected volume is crucial for the laboratory characterization of hydromechanical responses of rock fractures. This study reports a series of laboratory experiments to systematically demonstrate the effects of external temperature and dead volume on laboratory measurements of pore pressure and injected volume in a rock fracture. We characterize the hydraulic aperture of the fracture as a function of effective normal stress using the exponential aperture *** model is then employed to predict the pore pressure change and injected volume in the fracture without the influences of external temperature and dead volume. The external temperature changes in the cyclic loading test due to the Joule-Thompson effect for fluids. The effect of external temperature on pore pressure change in the fracture can be well explained by thermal pressurization of fluids. Our results also show that the external dead volume can significantly lower the pore pressure change in the fracture during the cyclic loading test under undrained conditions. The injected volume can also be substantially enlarged due to the external dead volume in a typical pore pressure system. Internal measurement of the pore pressure in the fracture using a fiber optic sensor cannot exclude the influences of external temperature and dead volume, primarily because of the good hydraulic communication between the fracture and pore pressure system. This study suggests that the effects of external temperature and dead volume on pore pressure response and injected volume should be evaluated for accurate laboratory characterization and inter-laboratory comparison.

关键词： Fracture aperture Thermal pressurization External dead volume Pressure attenuation Injected volume Fiber optic sensor

Canonical Workflows in Simulation-based Climate Sciences

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Data Intelligence 2022年第2期4卷 212-225页

作者： Ivonne Anders Karsten Peters-von Gehlen hannes Thiemann German Climate Computing Center(DKRZ) BundesstraBe 45aD-20146 HamburgGermany

In this paper we present the derivation of Canonical Workflow Modules from current workflows in simulation-based climate science in support of the elaboration of a corresponding framework for simulationbased *** first identified the different users and user groups in simulation-based climate science based on their reasons for using the resources provided at the German Climate Computing Center(DKRZ).What is special about this is that the DKRZ provides the climate science community with resources like high performance computing(HPC),data storage and specialised services,and hosts the World Data Center for Climate(WDCC).Therefore,users can perform their entire research workflows up to the publication of the data on the same *** analysis shows,that the resources are used by two primary user types:those who require the HPC-system to perform resource intensive simulations to subsequently analyse them and those who reuse,build-on and analyse existing *** then further subdivided these top-level user categories based on their specific goals and analysed their typical,idealised workflows applied to achieve the respective project *** find that due to the subdivision and further granulation of the user groups,the workflows show apparent ***,similar"Canonical Workflow Modules"can be clearly made *** modules are"Data and Software(Re)use","Compute","Data and Software Storing","Data and Software Publication","Generating Knowledge"and in their entirety form the basis for a Canonical Workflow Framework for Research(CWFR).It is desirable that parts of the workflows in a CWFR act as FDOs,but we view this aspect ***,we reflect on the question whether the derivation of Canonical Workflow modules from the analysis of current user behaviour still holds for future systems and work processes.

关键词： Canonical Workflow Fair Digital Objects HPC infrastructures Data services Climate science

Urbanization between compactness and dispersion:designing a spatial model for measuring 2D binary settlement landscape configurations

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International Journal of Digital Earth 2019年第6期12卷 679-698页

作者： hannes Taubenbock Michael Wurm Christian GeiB Stefan Dech Stefan Siedentop German Aerospace Center(DLR) German Remote Sensing Data Center(DFD)OberpfaffenhofenGermany ILS-Research Institute for Regional and Urban Development DortmundGermany

Measuring spatial patterns is a crucial task in spatial *** indicators have been developed to measure patterns in a quantitative ***,most comparative studies rely on relative comparisons,limiting their explanatory power to specific case *** by advancements in earth observation providing unprecedented resolutions of settlement patterns,this paper suggests a measurement technique for spatial patterns to overcome the limits of relative *** design a model spanning a feature space based on two metrics-largest patch index and number of *** feature space is defined as‘dispersion index’and covers the entire spectrum of possible two-dimensional binary(settlement)*** model configuration allows for an unambiguous ranking of each possible pattern with respect to spatial *** spatial resolutions of input data as well as selected areas of interest influence measurement results,we test dependencies within the ***,common other spatial metrics are selected for testing whether they allow unambiguous *** scenarios,we apply the model to artificially generated patterns representing all possible configurations as well as to real-world settlement classifications differing in growth dynamics and patterns.

关键词： Land cover spatial patterns landscape metrics dispersion index sensitivity analysis urban settlements remote sensing comparative spatial analysis