13597 to 13608 of 13961 results
For long-standing theoretical reasons, it is often asserted that the threshold shear stress for entrainment of sedimentary particles (τ*t = ρfu*2t, made dimensionless as A = ρfu*2t/((ρp − ρf)gd)) has […]
Enhancements in relativistic electron fluxes in the outer radiation belt often occur following magnetic storms and have been suggested to result from resonant interactions with enhanced whistler-mode chorus emissions observed […]
Relativistic electrons in the outer Van Allen belt wreak havoc with satellites in geosynchronous orbit, but how they reach such high energies has been unclear. New data identify gyro-resonant wave-particle […]
New collections of plant material from the Merrick and Sweeney Mountains provide further evidence of Jurassic floral diversity in the Antarctic Peninsula. Eighteen taxa are recognised, including sphenophytes (Equisetum), ferns […]
Six new records of ferns from the late Albian flora of Alexander Island, Antarctic Peninsula, provide further evidence for a widespread Cretaceous Austral flora. Phyllopteroides antarctica sp. nov. is the […]
Araucarian conifers are an important component of Cretaceous through Paleogene floras in the Antarctic Pensinsula. A well-preserved Eocene petrified trunk from Seymour Island, Antarctica reveals the growth form and bark […]
Based on the temporal distribution, abundance, and taxonomic composition of wood floras, four phases of vegetation development are recognized through the Cretaceous to Early Tertiary of the Antarctic Peninsula: (1) […]
Twenty-one members of the secretin family (family 2) of G-protein-coupled receptors (GPCRs) were identified via directed cloning and data-mining of the Fugu Genome Consortium database, representing the most comprehensive description […]
Empirical determination of the scaling properties and exponents of time series presents a formidable challenge in testing, and developing, a theoretical understanding of turbulence and other out-of-equilibrium phenomena. We discuss […]
Recently, Portelli et al (2003), Phys. Rev. Lett. 90 104501 have semi-numerically obtained a functional form of the probability distribution of fluctuations in the total energy flow in a model […]
Gareth Chisham describes a new method for remotely sensing reconnection in the magnetosphere. This article is based on his poster, which won a 2005 Rishbeth Prize.
The open-closed magnetic field line boundary (OCB) is best measured at the foot points of the boundary in the Earth’s ionosphere where continuous and extensive spatiotemporal measurements can be made. […]