Results 11 to 20 of about 151,031 (208)
Atmospheric Science Letters, Volume 24, Issue 1, January 2023., 2023 We report on a meeting on progress and challenges in convection‐permitting data assimilation. Novel developments include the assimilation of novel observations such as cloud‐affected satellite radiances, ground‐based profiling networks and aircraft data, as well as methodological advancements in error covariance modelling, and progress in operational ...
Guannan Hu +7 more
wiley +1 more source
On the lithium abundance of the visual binary components ξ Boo A (G8V) and ξ Boo B (K5V)
Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022 Abstract A spectroscopic investigation of the lithium resonance doublet in ξ Boo A and ξ Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R = 130,000 spectra with a signal‐to‐noise ratio (S/N) per pixel of up to 3200 using the 11.8 m LBT and PEPSI.
Klaus G. Strassmeier, Matthias Steffen
wiley +1 more source
Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022 Abstract The advent of ultra‐precise photometry space missions enables the possibility of investigating stellar interiors with mixed modes. The structural variations induced by the discontinuity of the chemical composition left behind during the first dredge–up is an important feature in the stellar mid‐layers located between the hydrogen‐burning shell
Chen Jiang
wiley +1 more source
Low‐boiling Point Perfluorocarbon Nanodroplets as Dual‐Phase Dual‐Modality MR/US Contrast Agent
ChemPhysChem, Volume 23, Issue 24, December 16, 2022., 2022 Low‐boiling point perfluorocarbon nanodroplets is vaporized into microbubbles using acoustic activation, establishing them as phase‐change contrast agents for ultrasound. The unique hyperCEST signatures of nanodroplets and microbubbles are demonstrated, enabling their use not only as a dual‐phase but also as a dual‐modality MR/US contrast agent ...
Christian T. McHugh +6 more
wiley +1 more source
Cosmological status of Lagrangian theory of density perturbations [PDF]
Astron.Rep.51:431-434,2007, 2006 We show that hydrodynamical and field approaches in theory of cosmological scalar perturbations are equivalent for a single medium. We also give relations between notations introduced by V. Lukash, J. Bardeen, J. Bardeen et al. and G. Chibisov and V. Mukhanov.
arxiv +1 more source
A new approach for extracting information from protein dynamics
Proteins: Structure, Function, and Bioinformatics, Volume 91, Issue 2, Page 183-195, February 2023., 2023 Abstract Increased ability to predict protein structures is moving research focus towards understanding protein dynamics. A promising approach is to represent protein dynamics through networks and take advantage of well‐developed methods from network science.
Jenny Liu +2 more
wiley +1 more source
Second-order Gauge-invariant Cosmological Perturbation Theory: Current Status [PDF]
Advances in Astronomy vol. 2010 (2010), 576273, 2010 The current status of the recent developments of the second-order gauge-invariant cosmological perturbation theory is reviewed. To show the essence of this perturbation theory, we concentrate only on the universe filled with a single scalar field. Through this review, we point out the problems which should be clarified for the further theoretical ...
arxiv +1 more source
Gravitation Field Dynamics in Jeans Theory [PDF]
Journal of Astrophysics and Astronomy, Volume 29 Issue 3-4
September-December 2008 pp 379-386, 2016 Closed system of time equations for nonrelativistic gravitation field and hydrodynamic medium was obtained by taking into account binary correlations of the field, which is the generalization of Jeans theory. Distribution function of the systemwas built on the basis of the Bogolyubov reduced description method.
arxiv +1 more source
Perturbation of mass accretion rate, associated acoustic geometry and stability analysis [PDF]
New Astronomy 51 (2017) 153-160, 2014 We investigate the stability of stationary integral solutions of an ideal irrotational fluid in a general static and spherically symmetric background, by studying the profile of the perturbation of the mass accretion rate. We consider low angular momentum axisymmetric accretion flows for three different accretion disk models and consider time dependent
arxiv +1 more source
Perturbations of self-similar Bondi accretion [PDF]
Astron.Astrophys.449:861-868,2006, 2005 The question of stability of steady spherical accretion has been studied for many years and, recently, the concept of spatial instability has been introduced. Here we study perturbations of steady spherical accretion flows (Bondi solutions), restricting ourselves to the case of self-similar flow, as a case amenable to analytic treatment and with ...
arxiv +1 more source