Results 61 to 70 of about 3,861,021 (288)

Collocation stations in space geodesy and their requirements

Научные труды Института астрономии РАН, 2022
Станции колокации в космической геодезии играют особенную роль, являясь, с одной стороны, станциями, на которых выполняются обычные геодезические измерения, но в то же время, с другой стороны, являясь станциями, связывающими различные технологии спутниковой геодезии, что позволяет производить оценку качества, точности и взаимную проверку результатов ...
openaire   +1 more source

Accelerated Brain Atrophy in Epilepsy: A Prospective Population‐Based Study

Annals of Neurology, EarlyView.
Objective Previous longitudinal neuroimaging studies suggest that epilepsy is a progressive disorder. To date, these findings have relied largely on populations from tertiary centers, resulting in ascertainment bias, as severely affected individuals are more likely to be rescanned.
Marian Galovic, Rebecca S. N. Liu, Alex D. Everitt, Robert Terziev, Louis Lemieux, Matthias J. Koepp, John S. Duncan   +6 more
wiley   +1 more source

Optimizing Strategies for Non‐Invasive Prospection of Settlements in the Intertidal Zone: A Case Study From the Centre of the Drowned Medieval Village of Tolsende (Scheldt Estuary, the Netherlands)

Archaeological Prospection, EarlyView.
ABSTRACT Medieval and early modern drowned villages in the intertidal zone of the Scheldt estuary (the Netherlands) constitute intriguing yet largely understudied components of north‐western Europe's underwater cultural heritage. Despite their high archaeological potential as time capsules of past settlement landscapes, research has remained limited ...
Jan Trachet, Sarah Bäumler, Stefan Krojer, Jeroen Verhegge, Wim De Clercq, Philippe De Smedt, Wouter H. Maes, Bente S. Majchczack, Immo Trinks, Dennis Wilken   +9 more
wiley   +1 more source

Ant Diversity of the Xisha Islands: Community Structure, Exotic Species Colonization, and Ecological Functions in a Tropical Coral Archipelago

Biological Diversity, EarlyView.
The first inventory of ants from the Xisha Islands of the South China Sea was compiled, revealing 21 species: 70% native and 30% exotic. Anthropogenic disturbance primarily drove exotic colonization, whereas island area showed weak positive effects on species richness. Most ants were omnivorous, with key mutualistic and seed‐dispersal roles.
Hua‐Yan Chen, Zhi‐Xuan Liu, Zheng‐Hui Xu, Rui‐Chong Wang, Shi‐Xiao Luo   +4 more
wiley   +1 more source

Space geodesy and the global forecast of earthquakes

Eos, Transactions American Geophysical Union, 1989
In view of the unprecedented increase in population in the developing nations and the apparent concentration of much of this population in urban centers within regions of seismic risk, we recommend the implementation of geodetic networks with a scale and distribution appropriate to characterizing earthquake risk in these nations. Synopsis of resolution
Roger Bilham, Susanna Zerbini
openaire   +1 more source

Exploring the Boundaries of Aromaticity in Complex Structures and Excited States Through Computational Analysis

Chemistry – A European Journal, EarlyView.
Understanding aromaticity has evolved from benzene‐centric concepts to a broad multidimensional framework spanning organic, inorganic, and excited‐state systems. This review highlights ambiguities between magnetic, electronic, geometric, and energetic descriptors, emphasizing the need for unified, multi‐criteria approaches.
Sílvia Escayola, Miquel Solà, Albert Poater   +2 more
wiley   +1 more source

Iris: Deep Space Small Satellite Radio [PDF]

, 2017
With nanosatellites being used for deep space missions, the need for a unique communications architecture to relay valuable mission data back to NASA’s Deep Space Network (DSN) is ...
Space Dynamics Laboratory
core   +1 more source

Effect of spatial correlation on the performances of modernized GPS and Galileo in relative positioning

Geodesy and Cartography, 2020
In the context of processing GNSS (Global Navigation Satellite System) data, it is known that the estimation of the ionospheric delays decreases the strength of the observation model and makes significant the time required to fix the ambiguities namely ...
Noureddine Kheloufi, Abdelhalim Niati
doaj   +1 more source

Study on the Preliminary Design of ARGO-M Operation System [PDF]

Journal of Astronomy and Space Sciences, 2010
Korea Astronomy and Space Science Institute has been developing one mobile satellite laser ranging system named as accurate ranging system for geodetic observation-mobile (ARGO-M). Preliminary design of ARGO-M operation system (AOS) which is one of the
Yoon-Kyung Seo, Hyung-Chul Lim, Dong-Young Rew, Jung Hyun Jo, Jong-Uk Park, Eun-Seo Park, Jang-Hyun Park   +6 more
doaj   +1 more source

Compact Manifolds With Unbounded Nilpotent Fundamental Groups and Positive Ricci Curvature

Communications on Pure and Applied Mathematics, EarlyView.
ABSTRACT It follows from the work of Kapovitch and Wilking that a closed manifold with nonnegative Ricci curvature has a uniformly almost nilpotent fundamental group. Leftover questions and conjectures, have asked if in this context the fundamental group is actually uniformly almost abelian. The main goal of this work is to construct examples (Mk9,gk)$(
Elia Bruè, Aaron Naber, Daniele Semola
wiley   +1 more source