Results 81 to 90 of about 562,891 (295)

Self‐Similar Blowup for the Cubic Schrödinger Equation

Communications on Pure and Applied Mathematics, EarlyView.
ABSTRACT We give a rigorous proof for the existence of a finite‐energy, self‐similar solution to the focusing cubic Schrödinger equation in three spatial dimensions. The proof is computer‐assisted and relies on a fixed point argument that shows the existence of a solution in the vicinity of a numerically constructed approximation.
Roland Donninger, Birgit Schörkhuber
wiley   +1 more source

YO!tech – Lust auf Technik

Medienimpulse, 2013
Mittwoch, 15.
Jennifer Berger
doaj  

Biophysical processes of morphogenesis in lizard lungs

Developmental Dynamics, EarlyView.
Abstract Background The lungs of squamate reptiles (lizards and snakes) are highly diverse, exhibiting single chambers, multiple chambers, transitional forms with two to three chambers, along with a suite of other anatomical features, including finger‐like epithelial projections into the body cavity known as diverticulae.
Kaleb Hill, Aaron H. Griffing, Michael A. Palmer, Bezia Lemma, Aria S. Lupo, Tony Gamble, Natalia A. Shylo, Andrej Košmrlj, Paul A. Trainor, Celeste M. Nelson   +9 more
wiley   +1 more source

Spin-to-Orbital Angular Momentum Conversion and Spin-Polarization Filtering in Electron Beams

, 2012
We propose the design of a space-variant Wien filter for electron beams that induces a spin half-turn and converts the corresponding spin angular momentum variation into orbital angular momentum of the beam itself by exploiting a geometrical phase ...
Ebrahim Karimi, Enrico Santamato, H. Rose, J. Grames, Lorenzo Marrucci, M. R. Scheinfein, O. Darrigol, Vincenzo Grillo   +7 more
core   +1 more source

Non‐stationary forest responses to hotter droughts: a temporal perspective considering the role of past legacies

Ecography, EarlyView.
Global change is altering forests worldwide, with multiple consequences for ecosystem functioning. Temporal changes in climate, and extreme, compounded weather events like hotter droughts are affecting the demography, composition and function of forests, leading to a highly uncertain future.
Xavier Serra‐Maluquer, Julen Astigarraga, César Morales-Molino, Paloma Ruiz-Benito   +3 more
wiley   +1 more source

Citylogistik Wien: Der Einfluss von Paketdienstleistern auf den Gesamtverkehr. Endbericht der Studie [PDF]

, 2019
In der öffentlichen Diskussion über die Citylogistik der Stadt Wien werden zunehmend Kurier-, Express und Paket (KEP)-Dienste für die Überlastung des Gesamtverkehrs verantwortlich gemacht. Jedoch gibt es kaum spezifische Erkenntnisse oder Studien darüber,
Dobrovnik, Mario, Herold, David Martin, Hribernik, Marko, Kummer, Sebastian, Mikl, Jasmin   +4 more
core  

Electron-Positron Pairs in Hot Accretion Flows and Thin Disk Coronae

, 1999
We investigate equilibrium accretion flows dominated by $e^+ e^-$ pairs. We consider one- and two-temperature accretion disk coronae above a thin disk, as well as hot optically thin two-temperature accretion flows without an underlying thin disk; we ...
Ann A. Esin, Bjornsson G., Chen X., Di Matteo T., Di Matteo T., Haardt F., Kusunose M., Kusunose M., Kusunose M., Kusunose M., Liang E. P., Nakamura K. E., Poutanen J., Shakura N. I., Sikora M., Stepney S., Stern B. E., Sunyaev R. A., Svensson R., Zdziarski A. A.   +19 more
core   +1 more source

Powerful yet challenging: mechanistic niche models for predicting invasive species potential distribution under climate change

Ecography, EarlyView.
Risk assessments of invasive species present one of the most challenging applications of species distribution models (SDMs) due to the fundamental issues of distributional disequilibrium, niche changes, and truncation. Invasive species often occupy only a fraction of their potential environmental and geographic ranges, as their spatiotemporal dynamics ...
Erola Fenollosa, Sean E. H. Pang, Natalie J. Briscoe, Antoine Guisan, Roberto Salguero-Gómez   +4 more
wiley   +1 more source

Defining Objectivity within Journalism

Nordicom Review, 2005
The article seeks the roots of the journalistic concept of objectivity in various theoretical schools. It argues that the concept of objectivity in journalism originates in the positivistic tradition and, furthermore, that it is strongly related to tan ...
Wien Charlotte
doaj   +1 more source

Conformal Killing spinors and special geometric structures in Lorentzian geometry - a survey

, 2001
This paper is a survey on special geometric structures that admit conformal Killing spinors based on lectures, given at the ``Workshop on Special Geometric Structures in String Theory'', Bonn, September 2001 and at ESI, Wien, November 2001.
Baum, Helga
core   +2 more sources