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Origin of Spectral Bands in the Crab Pulsar Radio Emission.
Phys Rev Lett
November 2024
Institute for Advanced Study, School for Natural Sciences, Princeton, New Jersey 08540, USA; Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA; Institute for Theory and Computation, Harvard University, Cambridge, Massachusetts 02138, USA; Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA; and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Article Synopsis
- - A new model has been developed to explain the high-frequency interpulse (HFIP) emission pattern of the Crab pulsar, suggesting that the emission bands are actually diffraction fringes influenced by the pulsar's magnetosphere acting as a diffraction screen.
- - The model accounts for specific features like band spacing, high polarization, and a constant position angle, effectively enabling the "tomography" of the pulsar's magnetosphere and directly revealing its plasma density profile.
- - The model is designed to be testable with future predictions made, and it proposes a connection between the observed "high-frequency components" and the HFIP emissions.
Spontaneous Sigmoid Colon Perforation and Ruptured Subserosal ("Zebra" Pattern) Small-Bowel Hematomas in Type IV Ehlers-Danlos Syndrome: A Case Report and a Short Review.
J Clin Med
July 2024
Department of Surgery, University Hospital Centre Zagreb, Kišpatićeva 12, 10000 Zagreb, Croatia.
Spontaneous colonic perforations (SCPs) in teenagers and young adults are extremely rare. Common underlying conditions, such as colonic tumors and diverticulitis, are absent at that age. The vascular type of Ehlers-Danlos Syndrome (vEDS) is one cause of SCP.
View Article and Find Full Text PDFNon-mass-type ductal carcinoma in situ of the breast on ultrasound: Features and pathological analysis.
J Cancer Res Ther
April 2024
Department of Ultrasound Diagnosis and Treatment, The First Affiliated Hospital of Shandong First Medical University and Shandong Provincial Qianfoshan Hospital, Jinan, Shandong, China.
Aims: The aims of this study were to investigate the ultrasound features of non-mass-type ductal carcinoma in situ (DCIS) of the breast and conduct a pathological analysis.
Material And Methods: Ultrasound images of 32 cases of non-mass-type DCIS of the breast, collected between September 2014 and June 2016, were analyzed. The characteristics of the lesions, including border, internal echogenicity, local glandular hyperplasia, micro-calcification, and intra-tumoral blood flow resistance index (RI), were analyzed, and a concurrent pathological analysis was conducted.
Organization and Formation of the Crossed-Foliated Biomineral Microstructure of Limpet Shells.
ACS Biomater Sci Eng
December 2023
Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada 18071, Spain.
To construct their shells, molluscs are able to produce a large array of calcified materials including granular, prismatic, lamellar, fibrous, foliated, and plywood-like microstructures. The latter includes an aragonitic (the crossed-lamellar) and a calcitic (the crossed-foliated) variety, whose modes of formation are particularly enigmatic. We studied the crossed-foliated calcitic layers secreted solely by members of the limpet family Patellidae using scanning and transmission electron microscopy and electron backscatter diffraction.
View Article and Find Full Text PDFInternal strain tunes electronic correlations on the nanoscale.
Sci Adv
December 2018
1. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany.
In conventional metals, charge carriers basically move freely. In correlated electron materials, however, the electrons may become localized because of strong Coulomb interactions, resulting in an insulating state. Despite considerable progress in the last decades, elucidating the driving mechanisms that suppress metallic charge transport, the spatial evolution of this phase transition remains poorly understood on a microscopic scale.
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