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Skull flexure from blast waves: a mechanism for brain injury with implications for helmet design.
From numerical hydrodynamic simulations, it is discovered that nonlethal blasts can induce sufficient skull flexure to generate potentially damaging loads in the brain, even without a head impact.
New dynamical mean-field dynamo theory and closure approach.
We develop a new nonlinear mean field dynamo theory that couples field growth to the time evolution of the magnetic helicity and the turbulent electromotive force, E. We show that the difference…
High-Resolution Chandra HETGS and Rossi X-Ray Timing Explorer Observations of GRS 1915+105: A Hot Disk Atmosphere and Cold Gas Enriched in Iron and Silicon
The time-averaged 30 ks Chandra AO1 High Energy Transmission Grating Spectrometer observation of the microquasar GRS 1915+105 in the low hard state reveals for the first time in this source neutral K…
Consequences of Repeated Blood-Brain Barrier Disruption in Football Players
The correlation of serum S100B, auto-antibodies and DTI changes support a link between repeated BBBD and future risk for cognitive changes and predicted persistence of MRI-DTI abnormalities which in turn correlated with cognitive changes.
Does external pressure explain recent results for molecular clouds
The recent paper by Heyer et al. indicates that observations of size, linewidth and column density of interstellar clouds do not agree with simple virial equilibrium (SVE) as a balance between…
Antiquity of the South Atlantic Anomaly and evidence for top-down control on the geodynamo
This work reports the first archaeomagnetic curve from southern Africa and proposes that the recurrence of low field strengths reflects core flux expulsion promoted by the unusual core–mantle boundary (CMB) composition and structure beneath southern Africa defined by the African large low shear velocity province (LLSVP).
Persistent, Long-term Cerebral White Matter Changes after Sports-Related Repetitive Head Impacts
A single football season of RHIs without clinically-evident concussion resulted in WM changes that correlated with multiple helmet impact measures and persisted following 6 months of no-contact rest, which could potentially contribute to cumulative WM changes with subsequent RHI exposures.
Low-Mass Binary Induced Outflows from Asymptotic Giant Branch Stars
A significant fraction of planetary nebulae (PNe) and protoplanetary nebulae (PPNe) exhibit aspherical, axisymmetric structures, many of which are highly collimated. The origin of these structures is…
Constraints on the Magnitude of α in Dynamo Theory
We consider the back-reaction of the magnetic field on the magnetic dynamo coefficients and the role of boundary conditions in interpreting whether numerical evidence for suppression is dynamical. If…
Evidence for a Dynamo in the Main Group Pallasite Parent Body
Paleointensity measurements indicate strong paleomagnetic fields, suggesting dynamo action in the pallasite parent body, and suggest that some pallasites formed when liquid FeNi from the core of an impactor was injected as dikes into the shallow mantle of a ~200-kilometer-radius protoplanet.