... onFacebookTwitterLinkedInRedditWechat Literatur 1 Briefliche Mitteilung von H. Wergeland (Hurdal/Norwegen) vom März 1985. 2 W. Heisenberg: Der ... 38– 39. 7 Briefliche Mitteilung von H. Wergeland (Hurdal/Norwegen). 8 Archiv der Karl-Marx-Universität Leipzig. ... Bl. 2. 9 Briefliche Mitteilung von H. Wergeland (Hurdal/Norwegen) vom März 1985. 10 W. Heisenberg: Der ... S. 219. 11 Briefliche Mitteilung von H. Wergeland (Hurdal/Norwegen) vom März 1985. 12 W. Heisenberg: Der ...
Tópico(s): Philosophy, Science, and History
1989 - Wiley | Physik Journal
M. Monder, P. Kozakiewicz, Agnieszka Jankowska,
... percentage of cuttings forming a callus only in ‘Hurdals’ and ‘Maiden’s Blush’. The width of the ... full blooming in four of the studied cultivars (‘Hurdals’, ‘Maiden’s Blush’, ‘Mousseuse Rouge’, ‘Semiplena’) and in ...
Tópico(s): Horticultural and Viticultural Research
2017 - Academic Press | Notulae Botanicae Horti Agrobotanici Cluj-Napoca
Hege Westskog, Tanja Winther, Marianne Aasen,
This paper presents a qualitative study of Hurdal Ecovillage in Norway. It explores how the actors involved have interacted over time and contributed to shaping the ecovillage. The study demonstrates that ... sustainability rather than as a goal in itself. Hurdal Ecovillage has undergone two distinct development phases. First, ...
Tópico(s): Collaborative and Sustainable Housing Initiatives
2018 - Multidisciplinary Digital Publishing Institute | Sustainability
... blooming, difficult-to-root cultivars Duchesse d'Angoulême, Hurdals, Maiden's Blush, Mousseuse Rouge were cut at ... and reducing sugars in the plant tissue. In Hurdals and Maiden's Blush, none of rooting stimulators ...
Tópico(s): Plant tissue culture and regeneration
2019 - Taylor & Francis | Biological Agriculture & Horticulture
... of said practices. The ecovillages under study are Hurdal in Norway and Findhorn in Scotland. The study ... to gain access to economic resources for expansion. Hurdal ecovillage sold its land to a private developer ...
Tópico(s): Community Development and Social Impact
2020 - Multidisciplinary Digital Publishing Institute | Sustainability
M. Monder, P. Kozakiewicz, Agnieszka Jankowska,
... on the response of stem cuttings of Rosa “Hurdal” to plant origin preparations used as rhizogenesis enhancers ...
Tópico(s): Plant Physiology and Cultivation Studies
2021 - Frontiers Media | Frontiers in Plant Science
Deborah A. Striegel, Monica K. Hurdal,
The mechanism for cortical folding pattern formation is not fully understood. Current models represent scenarios that describe pattern formation through local interactions, and one recent model is the intermediate progenitor model. The intermediate progenitor (IP) model describes a local chemically driven scenario, where an increase in intermediate progenitor cells in the subventricular zone correlates to gyral formation. Here we present a mathematical model that uses features of the IP model and ...
Tópico(s): Functional Brain Connectivity Studies
2009 - Public Library of Science | PLoS Computational Biology
Philip L. Bowers, Monica K. Hurdal,
There is a rich literature in the theory of circle packings on geometric surfaces that from the beginning has exposed intimate connections to the approximation of conformal mappings. Indeed, one of the first publications in the subject, Rodin and Sullivan's 1987 paper [10], provides a proof of the convergence of a circle packing scheme proposed by Bill Thurston for approximating the Riemann mapping of an arbitrary proper simply-connected domain in ℂ to the unit disk. Bowers and Stephenson's work ...
Tópico(s): Advanced Numerical Analysis Techniques
2003 - Springer Nature | Mathematics and visualization
J. Tilak Ratnanather, Patrick E. Barta, Nancy A. Honeycutt, not provided I-Chi Lee, Harry Morris, Adam Dziorny, Monica K. Hurdal, Godfrey D. Pearlson, Michael I. Miller,
Dynamic programming is used to define boundaries of cortical submanifolds with focus on the planum temporale (PT) of the superior temporal gyrus (STG), which has been implicated in a variety of neuropsychiatric disorders. To this end, automated methods are used to generate the PT manifold from 10 high-resolution MRI subvolumes ROI masks encompassing the STG. A procedure to define the subvolume ROI masks from original MRI brain scans is developed. Bayesian segmentation is then used to segment the subvolumes ...
Tópico(s): Visual perception and processing mechanisms
2003 - Elsevier BV | NeuroImage
T. Otto, Anke Meyer‐Baese, Monica K. Hurdal, DeWitt Sumners, Dorothee P. Auer, Axel Wismüller,
Conventional model-based or statistical analysis methods for functional MRI (fMRI) are easy to implement, and are effective in analyzing data with simple paradigms. However, they are not applicable in situations in which patterns of neural response are complicated and when fMRI response is unknown. In this paper the "neural gas" network is adapted and rigorously studied for analyzing fMRI data. The algorithm supports spatial connectivity aiding in the identification of activation sites in functional ...
Tópico(s): Advanced Neuroimaging Techniques and Applications
2003 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Monica K. Hurdal, Ken Stephenson,
Locations and patterns of functional brain activity in humans are difficult to compare across subjects because of differences in cortical folding and functional foci are often buried within cortical sulci. Unfolding a cortical surface via flat mapping has become a key method for facilitating the recognition of new structural and functional relationships. Mathematical and other issues involved in flat mapping are the subject of this paper. It is mathematically impossible to flatten curved surfaces ...
Tópico(s): Morphological variations and asymmetry
2008 - Elsevier BV | NeuroImage
Anke Meyer‐Baese, O. Lange, Axel Wismueller, Monica K. Hurdal,
We compare five different unsupervised clustering techniques as tools for the analysis of dynamic susceptibility contrast MRI time series. The study included four subjects: two subjects with stroke and two subjects without focal neurological deficit. The goal was to determine the robustness and reliability of clustering methods in providing a self-organized segmentation of perfusion MRI data sharing common properties of signal dynamics. For this purpose, the relative signal reduction time series ...
Tópico(s): Advanced Neuroimaging Techniques and Applications
2007 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Information Technology in Biomedicine
... 628 Hurum, 235 Ullensaker (Jessheim), 237 Eidsvoll, 239 Hurdal, 121 Rømskog. 5 The calculations of the location ...
Tópico(s): Cultural Industries and Urban Development
2011 - Taylor & Francis | Industry and Innovation
Juan B. Gutiérrez, Monica K. Hurdal, Rana D. Parshad, John L. Teem,
Tópico(s): Genetic diversity and population structure
2011 - Springer Science+Business Media | Journal of Mathematical Biology
Anqi Qiu, Benjamin J. Tamber-Rosenau, Adam S. Greenberg, Monica K. Hurdal, Patrick E. Barta, Steven Yantis, Michael I. Miller,
Human primary visual cortex is organized retinotopically, with adjacent locations in cortex representing adjacent locations on the retina. The spatial sampling in cortex is highly nonuniform: the amount of cortex devoted to a unit area of retina decreases with increasing retinal eccentricity. This sampling property can be quantified by the linear cortical magnification factor, which is expressed in terms of millimeters of cortex per degree of visual angle. In this paper, we present a new method ...
Tópico(s): Neural dynamics and brain function
2006 - Elsevier BV | NeuroImage
Advantages and disadvantages are compared of using a rule-based paradigm versus a neural-network-based paradigm for developing expert systems involving structured selection problems. For comparison purposes, two knowledge-based expert systems were developed using the two alternative paradigms to solve the same specific problem: selection of pavement sections that would benefit most from the routing and sealing maintenance treatment. Each expert system used commercially available microcomputer software ...
Tópico(s): Infrastructure Maintenance and Monitoring
1993 - SAGE Publishing | Transportation Research Record Journal of the Transportation Research Board
Lili Ju, Monica K. Hurdal, Josh Stern, Kelly Rehm, Kirt Schaper, David A. Rottenberg,
During the past decade, several computational approaches have been proposed for the task of mapping highly convoluted surfaces of the human brain to simpler geometric objects such as a sphere or a topological disc. We report the results of a quantitative comparison of FreeSurfer, CirclePack, and LSCM with respect to measurements of geometric distortion and computational speed. Our results indicate that FreeSurfer performs best with respect to a global measurement of metric distortion, whereas LSCM ...
Tópico(s): Computer Graphics and Visualization Techniques
2005 - Elsevier BV | NeuroImage
Monica K. Hurdal, Ken Stephenson,
Cortical flattening algorithms are becoming more widely used to assist in visualizing the convoluted cortical gray matter sheet of the brain. Metric-based approaches are the most common but suffer from high distortions. Conformal, or angle-based algorithms, are supported by a comprehensive mathematical theory. The conformal approach that uses circle packings is versatile in the manipulation and display of results. In addition, it offers some new and interesting metrics that may be useful in neuroscientific ...
Tópico(s): Cell Image Analysis Techniques
2004 - Elsevier BV | NeuroImage
Monica K. Hurdal, Ken Stephenson, Phil Bowers, D. W. Sumners, David A. Rottenberg,
Methods Quasi-conformal flat maps of the human cerebellum (1,4) were created from a high-resolution Tl-weighted MRI volume (5). A topologically correct surface was produced from a cerebellar volume defined by a plane parallel to the posterior commisure-obex line and orthogonal to a plane passing through the vermal midline. Our quasi-conformal flattening procedure (2,3) was applied to this surface to produce flat maps; the cortical surface was parcellated according to (6), and activations produced by ...
Tópico(s): Vestibular and auditory disorders
2000 - Elsevier BV | NeuroImage
M. Monder, Konrad Woliński, Maciej Niedzielski, A. Pacholczak,
... cuttings harvested from shoots with closed flower buds: (‘Hurdals’ 47.5%,‘Maiden’s Blush’ 55.0%, ‘Semiplena’ ...
Tópico(s): Agriculture and Biological Studies
2016 - Academic Press | Notulae Botanicae Horti Agrobotanici Cluj-Napoca
Monica K. Hurdal, Philip L. Bowers, Ken Stephenson, D. W. Sumners, Kelly Rehm, Kirt Schaper, David A. Rottenberg,
We present a novel approach to creating flat maps of the brain. It is impossible to flatten a curved surface in 3D space without metric and areal distortion; however, the Riemann Mapping Theorem implies that it is theoretically possible to preserve conformal (angular) information under flattening. Our approach attempts to preserve the conformal structure between the original cortical surface in 3-space and the flattened surface. We demonstrate this with data from the human cerebellum and we produce ...
Tópico(s): Advanced Optical Imaging Technologies
1999 - Springer Science+Business Media | Lecture notes in computer science
O. Lange, Anke Meyer‐Baese, Monica K. Hurdal, Simon Y. Foo,
Tópico(s): Functional Brain Connectivity Studies
2006 - Elsevier BV | Biomedical Signal Processing and Control
... acids. The following once-blooming cultivars were chosen: ‘Hurdals’, ‘Maiden’s Blush’, ‘Mousseuse Rouge’, ‘Polstjarnan’, and ‘Semiplena’. ... as well as in the rooting degree in ‘Hurdals’, ‘Mousseuse Rouge’, and ‘Polstjarnan’. In general, the plant- ...
Tópico(s): Powdery Mildew Fungal Diseases
2019 - International Society for Horticultural Science | Acta Horticulturae
Gregory Toole, Monica K. Hurdal,
The brain’s cerebral cortex is folded into intricate patterns of gyri (hills) and sulci (valleys). The complete biological mechanism underlying the cortical folding process continues to remain elusive to this day. One proposed biological mechanism of cortical folding is the Intermediate Progenitor Model, which correlates patterns of regional self-amplification of neural intermediate progenitor cells with cortical folds. We construct mathematical models of cortical folding utilizing a Turing reaction– ...
Tópico(s): Nonlinear Dynamics and Pattern Formation
2013 - Elsevier BV | Computers & Mathematics with Applications
Hichem Hajlaoui, Samira Maatallah, Nawel Nasri, Nasr Hafedh,
... in salinity of the soil which a major hurdal in development of vegetation. In these highly salted ...
Tópico(s): Plant Stress Responses and Tolerance
2016 - Academic Journals | African Journal of Agricultural Research
Monica K. Hurdal, Juan B. Gutiérrez, Christian Laing, Deborah A. Smith,
Tópico(s): Hydrocarbon exploration and reservoir analysis
2007 - Springer Science+Business Media | Journal of Combinatorial Optimization
Lisa J. Larsson, Géraldine Morin, Antoine Bégault, Raphaëlle Chaine, Jeannine Abiva, Évelyne Hubert, Monica K. Hurdal, Li Mao, Beatriz Paniagua, Tran Giang, Marie‐Paule Cani,
Maintaining the local style and scale of 2D shape features during deformation, such as when elongating, compressing, or bending a shape, is essential for interactive shape editing. To achieve this, a necessary first step is to develop a robust classification method able to detect salient shape features, if possible in a hierarchical manner. Our aim is to overcome the limitations of existing techniques, which are not always able to detect what a user immediately identifies as a shape feature. Therefore, ...
Tópico(s): Image Processing and 3D Reconstruction
2015 - Springer International Publishing | Association for Women in Mathematics series
... old, once-flowering rose cultivars (‘Duchesse d’Angoulême’, ‘Hurdals’, ‘Maiden’s Blush’, ‘Mousseuse Rouge’, Rosa beggeriana ‘Polstjårnan’, ...
Tópico(s): Plant Physiology and Cultivation Studies
2023 - Multidisciplinary Digital Publishing Institute | Agronomy
H.K Schønwandt, Jon Steen Petersen,
... with shallow level magmatism in the Glitrevann and Hurdal areas. The porphyry-Mo mineralization in these prospects ...
Tópico(s): High-pressure geophysics and materials
1983 - Elsevier BV | Developments in geotectonics
... We use the circle packing technique of Bowers, Hurdal, Stephenson, et al., to first create a quasiconformal ...
Tópico(s): Advanced Numerical Analysis Techniques
2012 - Elsevier BV | Journal of Mathematical Analysis and Applications