Results 51 to 60 of about 6,930 (179)

Spatial distribution of acoustic traits in bird assemblages along regional bioclimatic gradients

Ecography, EarlyView.
Environmental variation shapes acoustic interactions among birds, creating spatial structures in the sonic signature of local species assemblages. Exploring these patterns at regional scales can reveal processes that segregate acoustic strategies along environmental gradients.
Michela Busana, Frédéric Sèbe, Luc Barbaro, Jonathan Carruthers‐ Jones, Solène Croci, Alice Eldridge, Almo Farina, Amandine Gasc, Charlène Gemard, Sylvain Haupert, Sandra Müller, Jean‐Yves Barnagaud   +11 more
wiley   +1 more source

On the period function of Newtonian systems [PDF]

, 2013
We study the existence of centers of planar autonomous system of the form $$(S) \quad \dot x=y,\qquad \dot y = -h(x) - g(x)y - f(x)y^2.$$ We are interested in the period function $T$ around a center 0. A sufficient condition for the isochronicity of (
Chouikha, A. Raouf, Timoumi, Mohsen
core   +1 more source

Differentiation of Plant and Animal‐Derived Cholesterol Using irm‐13C NMR and IRMS

Magnetic Resonance in Chemistry, EarlyView.
Determining and certifying the origin of ingredients, starting materials, and excipients used in manufactured goods like cosmetics and medicines can be difficult. In this report, we describe a robust approach for identifying the origin of cholesterol, a component of myriad consumer products using irm‐13C NMR and IRMS to differentiate plant versus ...
Anika M. Singh, Subir Chakraborty, Remington X. Poulin, R. Thomas Williamson   +3 more
wiley   +1 more source

Direct Photons from a Hybrid Approach -- Exploring the parameter space

, 2010
Direct photon spectra are calculated within a transport+hydrodynamics hybrid approach, in which the high-density part of the transport evolution has been replaced by a 3+1-dimensional hydrodynamic calculation.
Baeuchle, Bjoern, Bleicher, Marcus
core   +1 more source

Isotopic Composition of Solar Wind Calcium: First in Situ Measurement by CELIAS/MTOF on Board SOHO [PDF]

, 1997
We present first results on the Ca isotopic abundances derived from the high resolution Mass Time-of-Flight (MTOF) spectrometer of the charge, element, and isotope analysis system (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO).
A. B. Galvin, Amari S., B. Klecker, D. Hovestadt, F. Gliem, F. M. Ipavich, G. Gloeckler, Geiss J., H. Grünwaldt, J. Geiss, Leske R. A., M. Hilchenbach, M. R. Aellig, P. Bochsler, P. Wurz, R. Kallenbach, S. Hefti   +16 more
core   +3 more sources

Temporal and Spatial Organization in Collaborative Work by Nurses in an Emergency and Critical Care Center

Symbolic Interaction, EarlyView.
This study describes the work at an emergency and critical care center, focusing on the collaboration of multiple nurses when moving patients from the outpatient department to the ward. This study is an ethnomethodological ethnography based on fieldwork at a hospital and analysis of video data. The patient transport process is temporally organized into
Hiroki Maeda, Yumi Nishimura
wiley   +1 more source

Centers and Isochronous Centers for Two Classes of Generalized Seventh and Ninth Systems [PDF]

Journal of Dynamics and Differential Equations, 2010
We classify new classes of centers and of isochronous centers for polynomial differential systems in R2 of arbitrary odd degree d ≥ 7 that in complex notation z = x + iy can be written as z˙=(λ+i)z+(zz)d−7−2j/2 (Az5+jz2+j+Bz4+jz3+j+Cz3+jz4+j+Dz7+2j), where j is either 0 or 1, λ ∈ R and A,B,C ∈ C. Note that if j = 0 and d = 7 we obtain a special case of
Llibre, Jaume, Valls, Clàudia
openaire   +4 more sources

Flow‐pattern evolution of the Scandinavian Ice Sheet indicated by the subglacial lineation record over Norway, Sweden and Finland

Boreas, EarlyView.
We present a 25‐stage reconstruction of the ice‐flow pattern evolution of the Scandinavian Ice Sheet based on mapping and analysis of ~240 000 subglacial lineations and lineation fields across Norway, Sweden, Finland, and parts of NW Russia. Our reconstruction uses a glacial geomorphological inversion approach, in which we generated 611 individual ...
Frances E. G. Butcher, Anna L. C. Hughes, Helen E. Dulfer, Christopher D. Clark, Jeremy C. Ely, Emma L. M. Lewington, Benjamin M. Boyes, Alex C. Scoffield, Stephen Howcutt, Christiaan R. Diemont   +9 more
wiley   +1 more source

UNIFORM ISOCHRONOUS CENTER OF HIGHER-DEGREE POLYNOMIAL DIFFERENTIAL SYSTEMS

Journal of Applied Analysis & Computation, 2023
Summary: In this paper, we study the uniform isochronous center of a class of more general higher-degree of polynomial differential systems and give the necessary and sufficient conditions for the origin point to be a center. At the same time, we illustrate that under some restrictions, the composition conjecture about these differential systems is ...
openaire   +1 more source

New analysis in the field of open cluster Collinder 223

, 2003
The present study of the open cluster Collinder 223 (Cr 223) has been mainly depended on the photoelectric data of Claria & Lapasset (1991; hereafter CL91).
A. L. Tadross, Collinder P., Hogg A. A., Mermilliod J.-C., Meynet G., Schmidt-Kaler Th., Trumpler R. J., Wallenquist A.   +7 more
core   +1 more source