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Now showing items 125-144 of 164

Radiation pressure measurements on micron-size individual dust grains 
Abbas, MM; Thomas, E.; 0000-0002-7747-0284 (2020-06-18)
Measurements of electromagnetic radiation pressure have been made on individual silica (SiO2) particles levitated in an electrodynamic balance. These measurements were made by inserting single charged particles of known ...
Rapid evolution of disease resistance is accompanied by functional changes in gene expression in a wild bird 
Bonneaud, Camille; Balenger, Susan L.; Russell, Andrew F.; Zhang, Jiangwen; Hill, Geoffrey E.; Edwards, Scott V. (2020-06-03)
Wild organisms are under increasing pressure to adapt rapidly to environmental changes. Predicting the impact of these changes on natural populations requires an understanding of the speed with which adaptive phenotypes ...
Reactive transport of trace elements and isotopes in the Eutaw coastal plain aquifer, Alabama 
Lee, Ming-Kuo; Griffin, James; Saunders, James; Wang, Yang; Jean, Jiin-Shuh (2020-06-18)
[1] We integrate groundwater geochemistry, mineralogy, and numerical modeling techniques to study the reactive transport of heavy metals and isotopes in the Eutaw coastal plain aquifer, Alabama. Geochemical data show that ...
Reef endemism, host specificity and temporal stability in populations of symbiotic dinoflagellates from two ecologically dominant Caribbean corals 
Thornhill, Daniel J; Xiang, Yu; Fitt, William K; Santos, Scott R (2019-07-01)
BACKGROUND: The dinoflagellate genus Symbiodinium forms symbioses with numerous protistan and invertebrate metazoan hosts. However, few data on symbiont genetic structure are available, hindering predictions of how these ...
Regime transition of ion Bernstein instability driven by ion shell velocity distributions 
Min, Kyungguk; Liu, Kaijun; 0000-0002-2095-8529; 0000-0001-5882-1328 (2020-06-03)
Linear kinetic dispersion theory is used to investigate a regime transition of the ion Bernstein instability driven by a proton velocity distribution with positive slopes with respect to the perpendicular velocity, ...
Reproduction and development in Halocaridina rubra Holthuis, 1963 (Crustacea: Atyidae) clarifies larval ecology in the Hawaiian anchialine ecosystem 
Havird, Justin C; Vaught, Rebecca C; Weese, David A; Santos, Scott R (2019-08-01)
Larvae in aquatic habitats often develop in environments different from those they inhabit as adults. Shrimp in the Atyidae exemplify this trend, as larvae of many species require salt or brackish water for development, ...
Reproductive Value and the Stochastic Demography of Age-Structured Populations 
Engen, Steinar; Lande, Russell; Saether, Bernt-Erik; Dobson, F. Stephen; 0000-0001-5562-6316 (2020-06-03)
The dynamics of an age-structured population in a fluctuating environment is determined by the stochastic individual contributions from annual survival and fecundity to the total reproductive value of the population the ...
Reversal of magnetic field rotation in the reconnection layer due to shear flow effects 
Sun, Xiaoxia; Lin, Yu; Wang, Xiaogang; 0000-0001-8003-9252 (2020-06-18)
We investigate the effects of shear flows on the so-called "component reconnection," in which the guide field B-y not equal 0, by solving a one-dimensional Riemann problem for magnetopause reconnection using a resistive ...
Ring/Shell Ion Distributions at Geosynchronous Orbit 
Thomsen, M. F.; Denton, M. H.; Gary, S. P.; Liu, Kaijun; Min, Kyungguk; 0000-0001-5882-1328 (2020-05-28)
One year's worth of plasma observations from geosynchronous orbit is examined for ion distributions that may simultaneously be subject to the ion Bernstein (IB) instability (generating fast magnetosonic waves) and the ...
Scalings for the Alfven-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations 
Gary, S. Peter; Fu, Xiangrong; Cowee, Misa M.; Winske, Dan; Liu, Kaijun; 0000-0001-5882-1328 (2020-06-01)
The Alfven-cyclotron instability is driven by an ion temperature anisotropy such that T-perpendicular to/T-|| >1 where and || denote directions perpendicular and parallel to a uniform background magnetic field B-o, ...
Scalings of Alfven-cyclotron and ion Bernstein instabilities on temperature anisotropy of a ring-like velocity distribution in the inner magnetosphere 
Min, Kyungguk; Liu, Kaijun; Gary, S. Peter; 0000-0002-2095-8529; 0000-0001-5882-1328 (2020-06-03)
A ring-like proton velocity distribution with f(p)(v)/v>0 and which is sufficiently anisotropic can excite two distinct types of growing modes in the inner magnetosphere: ion Bernstein instabilities with multiple ion ...
Severe mammal declines coincide with proliferation of invasive Burmese pythons in Everglades National Park 
Dorcas, Michael E.; Willson, John D.; Reed, Robert N.; Snowd, Ray W.; Rochforde, Michael R.; Miller, Melissa A.; Meshaka Jr., Walter E.; Andreadish, Paul T.; Mazzottie, Frank J.; Romagosa, Christina M.; Hart, Kristen M. (2020-04-01)
Invasive species represent a significant threat to global biodiversity and a substantial economic burden. Burmese pythons, giant constricting snakes native to Asia, now are found throughout much of southern Florida, ...
Siboglinid-bacteria endosymbiosis: A model system for studying symbiotic mechanisms 
Thornhill, Daniel J; Fielman, Kevin T; Santos, Scott R; Halanych, Kenneth M (2019-04-29)
Siboglinid worms are a group of gutless marine annelids which are nutritionally dependent upon endosymbiotic bacteria.1,2 Four major groups of siboglinids are known including vestimentiferans, Osedax spp., frenulates and ...
Signatures of electron Landau resonant interactions with chorus waves from THEMIS observations 
Min, Kyungguk; Liu, Kaijun; Li, Wen; 0000-0002-2095-8529; 0000-0001-5882-1328 (2020-06-05)
Simultaneous observations of electron phase space density (PSD) and chorus waves for more than 4 years by the Time History of Events and Macroscale Interactions during Substorms (THEMIS) are analyzed to identify signatures ...
Simulation studies of a recorder in three dimensions 
Giordano, Nicholas J. (2015-10-12)
The aeroacoustics of a recorder are explored using a direct numerical simulation based on the Navier–Stokes equations in three dimensions. The qualitative behavior is studied using spatial maps of the air pressure and ...
Solar cycle variation of plasma mass density in the outer magnetosphere: Magnetoseismic analysis of toroidal standing Alfven waves detected by Geotail 
Takahashi, Kazue; Denton, Richard E.; Hirahara, Masafumi; Min, Kyungguk; Ohtani, Shin-ichi; Sanchez, Ennio; 0000-0002-2095-8529 (2020-06-05)
We study the variation of plasma mass density in the outer magnetosphere over a solar cycle using mass density estimated from the frequency of fundamental toroidal standing Alfven waves observed by the Geotail spacecraft. ...
Solitary potential structures associated with ion and electron beams near 1 R-E altitude 
Bounds, SR; Pfaff, Rf; Knowlton, SF; Mozer, FS; Temerin, MA; Kletzing, CA (2020-06-30)
Small-scale solitary electric potential structures are commonly observed on auroral field lines with the Polar Electric Field Instrument (EFI). This study focuses on observations of solitary structures in the southern ...
Spectral properties and associated plasma energization by magnetosonic waves in the Earth's magnetosphere: Particle-in-cell simulations 
Sun, Jicheng; Gao, Xinliang; Lu, Quanming; Chen, Lunjin; Liu, Xu; Wang, Xueyi; Tao, Xin; Wang, Shui; 0000-0001-5533-5981 (2020-06-01)
In this paper, we perform a 1-D particle-in-cell (PIC) simulation model consisting of three species, cold electrons, cold ions, and energetic ion ring, to investigate spectral structures of magnetosonic waves excited by ...
Spin splittings from first-order symmetry-adapted perturbation theory without single-exchange approximation 
Waldrop, Jonathan; Patkowski, Konrad; 0000-0003-0442-193X; 0000-0002-4468-207X (2020-05-20)
The recently proposed spin-flip symmetry-adapted perturbation theory (SF-SAPT) first-order exchange energy [Patkowski et al., J. Chem. Phys. 148, 164110 (2018)] enables the standard open-shell SAPT approach to treat arbitrary ...
Statistical correlation of low-altitude ENA emissions with geomagnetic activity from IMAGE/MENA observations 
Mackler, D. A.; Jahn, J-M; Perez, J. D.; Pollock, C. J.; Valek, P. W. (2020-06-03)
Plasma sheet particles transported Earthward during times of active magnetospheric convection can interact with exospheric/thermospheric neutrals through charge exchange. The resulting Energetic Neutral Atoms (ENAs) are ...