Results 81 to 90 of about 113,373 (284)

The Scale of Cosmic Isotropy

, 2012
The most fundamental premise to the standard model of the universe, the Cosmological Principle (CP), states that the large-scale properties of the universe are the same in all directions and at all comoving positions.
A Buzzi, A. Cappi, A.F. Heavens, C Marinoni, C. Clarkson, C.K. McBride ., D.J. Eisenstein ., D.W. Hogg ., G. Lemaitre, G.F.R. Ellis, J Bel, J. Gaite, J. Jia, K. Bolejko, L. Amendola, L. Pietronero, M. Davis, M.G. Kendall, M.N. Célérier, P.C. Gregory, R. Giovannelli, S. Bharadwaj, S. Perlmutter ., S. Weinberg, SDSS collaboration, SDSS collaboration, Supernova Search Team collaboration, V.J. Martinez   +27 more
core   +3 more sources

How to Avoid the Ambiguity in Applying the Copernican Principle for Cosmic Topology: Take the Observational Approach [PDF]

, 2001
It is often stated that homogeneity and isotropy of the Universe are assumptions of the almost Friedmann-Lema^itre (FL) model (the hot big bang model), inspired from the Copernican Principle.
B.F. Roukema, Balbi, Broadhurst, de Sitter, Fagundes, Friedmann, Friedmann, Gomero, Hoyle, Joshi, Lange, Lehoucq, Lemaître, Luminet, Roukema, Roukema, Roukema, Roukema, Schwarzschild, Schwarzschild, Thurston, Uzan, Weinberg   +22 more
core   +3 more sources

Brainstem and Cerebellar Volume Loss and Associated Clinical Features in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Progressive Supranuclear Palsy (PSP) is a neurodegenerative ‘tauopathy’ with predominating pathology in the basal ganglia and midbrain. Caudal tau spread frequently implicates the cerebellum; however, the pattern of atrophy remains equivocal.
Chloe Spiegel, Timothy P. Siejka, Cassandra Marotta, Josh J. Y. Lee, Kelly Bertram, Terence J. O'Brien, Meng Law, Lucy Vivash, Ian H. Harding   +8 more
wiley   +1 more source

Restoration of isotropy on fractals

, 1995
We report a new type of restoration of macroscopic isotropy (homogenization) in fractals with microscopic anisotropy. The phenomenon is observed in various physical setups, including diffusions, random walks, resistor networks, and Gaussian field ...
H. Watanabe, Hiroshi Watanabe, K. Hattori, K. Hattori, Kumiko Hattori, M. T. Barlow, M. T. Barlow, Martin T. Barlow, T. Hattori, Tetsuya Hattori, W. Sierpiński   +10 more
core   +2 more sources

Isotropy of low redshift type Ia supernovae: A Bayesian analysis [PDF]

, 2017
The standard cosmology strongly relies upon the Cosmological Principle, which consists on the hypotheses of large scale isotropy and homogeneity of the Universe. Testing these assumptions is, therefore, crucial to determining if there are deviations from
U. Andrade, C. Bengaly, J. Alcaniz, B. Santos   +3 more
semanticscholar   +1 more source

Diffusion Spectrum Imaging Maps Early Axonal Loss and a Unique Progressive Signal in Neuronal Intranuclear Inclusion Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To delineate specific in vivo white matter pathology in neuronal intranuclear inclusion disease (NIID) using diffusion spectrum imaging (DSI) and define its clinical relevance. Methods DSI was performed on 42 NIID patients and 38 matched controls.
Kaiyan Jiang, Yixiu Pei, Xiaobao Hu, Ying Xiong, Fang Wang, Yanyan Yu, Min Zhu, Dandan Tan, Meihong Zhou, Daojun Hong, Fuqing Zhou   +10 more
wiley   +1 more source

Value of MRI Outcomes for Preventive and Early‐Stage Trials in Spinocerebellar Ataxias 1 and 3

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To examine the value of MRI outcomes as endpoints for preventive and early‐stage trials of two polyglutamine spinocerebellar ataxias (SCAs). Methods A cohort of 100 participants (23 SCA1, 63 SCA3, median Scale for the Assessment and Rating of Ataxia (SARA) score = 5, 42% preataxic, and 14 gene‐negative controls) was scanned at 3T up ...
Thiago J. R. Rezende, Emilien Petit, Young Woo Park, Sophie Tezenas du Montcel, James M. Joers, Jonathan M. DuBois, H. Moore Arnold, Michal Povazan, Ipek Özdemir, Guita Banan, Romain Valabregue, Philipp Ehses, Jennifer Faber, Chiadi U. Onyike, Peter B. Barker, Jeremy D. Schmahmann, Eva‐Maria Ratai, Sub H. Subramony, Thomas H. Mareci, Khalaf O. Bushara, Henry Paulson, Thomas Klockgether, Alexandra Durr, Tetsuo Ashizawa, Christophe Lenglet, Gülin Öz, READISCA Investigators   +26 more
wiley   +1 more source

Optimization of the Walking Robot Parameters on the Basis of Isotropy Criteria

IEEE Access, 2022
Many authors proposed various criteria and concepts to assess manipulability of the robotic system. The isotropy criterion is used by other authors for synthesis of parallel manipulators, as a criterion of optimal force and transfer in all directions. In
Sayat Ibrayev, Arman Ibrayeva, Nutpulla Jamalov, Sarosh H. Patel   +3 more
doaj   +1 more source

On the zero set of G-equivariant maps

, 2008
Let $G$ be a finite group acting on vector spaces $V$ and $W$ and consider a smooth $G$-equivariant mapping $f:V\to W$. This paper addresses the question of the zero set near a zero $x$ of $f$ with isotropy subgroup $G$.
Field, Field, Golubitsky, J. S. W. LAMB, James, M. HELMER, Michel, P-L. BUONO   +7 more
core   +2 more sources

Fluid Biomarkers of Disease Burden and Cognitive Dysfunction in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Identifying objective biomarkers for progressive supranuclear palsy (PSP) is crucial to improving diagnosis and establishing clinical trial and treatment endpoints. This study evaluated fluid biomarkers in PSP versus controls and their associations with regional 18F‐PI‐2620 tau‐PET, clinical, and cognitive outcomes.
Roxane Dilcher, Charles B. Malpas, Stuart J. McDonald, William T. O’Brien, Craig Despott, Kelly L. Bertram, Matthew P. Pase, Lukas Frontzkowski, Meng Law, Terence J. O’Brien, Lucy Vivash   +10 more
wiley   +1 more source