Results 211 to 220 of about 233,898 (339)

Signal‐to‐noise and spatial resolution in in‐line imaging. 3. Optimization using a simple model

Journal of Synchrotron Radiation, EarlyView.
Geometrical magnification and X‐ray energy are optimized with respect to spatial resolution, contrast, noise, radiation dose and other image quality characteristics. The optimization is performed using a simple theoretical model of a homogeneous edge feature embedded in a bulk uniform sample, and the resulting generic analytical expressions for image ...
Timur E. Gureyev, David M. Paganin, Harry M. Quiney   +2 more
wiley   +1 more source

Satellite megaconstellations will threaten space-based astronomy. [PDF]

Nature
Borlaff AS, Marcum PM, Howell SB.
europepmc   +1 more source

Errors in reconstruction of dichroic X‐ray orientation tomography due to polarization rotation of the incident beam

Journal of Synchrotron Radiation, EarlyView.
Linear dichroic X‐ray tomography is a technique in which the linear dichroism of anisotropic materials is used to image crystal orientation in three dimensions. We show that the reconstruction of tomograms is subject to errors due to the change in polarization on propagation through the material and propose strategies for mitigating these effects ...
Matthew A. Marcus, Harlan Heilman, Kas Andrle, Jayden Plumb   +3 more
wiley   +1 more source

Demonstration of a family of X‐ray dark‐field retrieval approaches on a common set of samples

Journal of Synchrotron Radiation, EarlyView.
This study aims to guide users of dark‐field imaging in selecting the most suitable technique for their imaging goals. To this end, we provide a summary table and highlight opportunities for future research into the sources of dark‐field contrast across emerging methods.There are various imaging setups capable of capturing dark‐field images, each with ...
Samantha J. Alloo, Ying Ying How, Jannis N. Ahlers, David M. Paganin, Michelle K. Croughan, Kaye S. Morgan   +5 more
wiley   +1 more source

Preface to 'Newton, <i>Principia</i>, Newton Geneva Edition (17^th-19^th) and modern Newtonian mechanics: heritage, past & present'. [PDF]

Philos Trans A Math Phys Eng Sci
Pisano R.
europepmc   +1 more source

Encyclopedia of History of Astronomy [PDF]

Highlights of Astronomy, 1995
openaire   +1 more source

New opportunities for grassland species in warming temperate winters

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Temperate winters are getting warmer, the length of the growing season is increasing and mid‐winter fluctuations of warm and freezing temperatures are more frequent. Although typically winter dormant, some herbaceous perennials can maintain or grow green leaves during ...
F. Curtis Lubbe, Andrea Kučerová, Martin Bitomský, Jitka Klimešová   +3 more
wiley   +1 more source

Potential impact of the Sagittarius dwarf galaxy on the formation of young O-rich stars. [PDF]

Nat Commun
Sun T, Bi S, Chen X, Chen Y, Lu YL, Liu C, Buck T, Zhang X, Li T, Li Y, Wu Y, Ge Z, Ye L.   +12 more
europepmc   +1 more source

Flap Anatomies and Victorian Veils: Penetrating the Female Reproductive Interior

Gender &History, EarlyView.
ABSTRACT This article examines the reappearance in the early nineteenth century of anatomical flapbooks in the context of obstetrical education in Britain, America and France. It asks why liftable paper flaps were reintroduced at this time after their disappearance from medical atlases in the eighteenth century.
Margaret Carlyle, Marcia D. Nichols
wiley   +1 more source

The Progenitor Systems of Classical Novae in M31. [PDF]

Astrophys J
Abelson CS, Badenes C, Chomiuk L, Williams BF, Breivik K, Galbany L, Jiménez-Palau C.   +6 more
europepmc   +1 more source