We put forward a new approach to generate stable, fully three-dimensional light bullets, which is based on the matching of the intrinsic material dispersion with a suitable effective diffraction. The matching is achieved in adequate waveguide arrays whose refractive index is periodically modulated along the direction of light propagation. We show that by using nonconventional, out-of-phase longitudinal modulation of the refractive index of neighboring channels, it is possible to tune the effective diffraction to match the intrinsic material group velocity dispersion. Three-dimensional light bullets are shown to form at reduced energy levels, in settings where the dispersion would be far too weak to generate bullets in the absence of array.
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http://dx.doi.org/10.1103/PhysRevLett.105.033901 | DOI Listing |
JB JS Open Access
November 2024
Department of Orthopaedic Surgery, Mount Sinai, New York, New York.
Introduction: We assessed ChatGPT-4 vision (GPT-4V)'s performance for image interpretation, diagnosis formulation, and patient management capabilities. We aim to shed light on its potential as an educational tool addressing real-life cases for medical students.
Methods: Ten of the most popular orthopaedic trauma cases from OrthoBullets were selected.
Polymers (Basel)
November 2024
Faculty of Engineering, Federal University of Grande Dourados, Dourados 79825-070, MS, Brazil.
(IP) extract was added to prepare edible films using a central rotational composite design (CCRD) 2 with IP extract and sorbitol concentrations as variables. The IP extract was characterized by color parameters, total phenolic content, caffeine, flavonoids, and chlorophyll content, and antioxidant activity and the edible films were assessed for the same analysis and thickness, water vapor permeability (WVP), solubility in water, fluorescence, photodegradation and UV/Vis light barrier, FT-IR, thermogravimetry, and differential exploratory colorimetry. Sorbitol increased thickness and WVP, while the extract influenced the concentration of phenolic compounds in the films.
View Article and Find Full Text PDFJ Acoust Soc Am
November 2024
Department of Biomedical Engineering, the Fourth Affiliated Hospital of School of Medicine, and International School of Medicine, International Institutes of Medicine, Zhejiang University, Yiwu 322000, China.
Energy concentration is a key parameter for the characterization of light or acoustic bullets. To the best of our knowledge, the highest encircled-energy ratio in the mainlobe reported is merely 25% for the solitary bullet waves and 30% for the nonsolitary bullet waves. This letter reports experimentally and theoretically on a new family of acoustic bullets, namely, Airy pattern ultrasonic bullets, realized by the depth of focus synthesis.
View Article and Find Full Text PDFBJPsych Open
October 2024
Department of Psychological Medicine, University of Otago Christchurch, New Zealand.
Background: On 15 March 2019, a white supremacist gunman sequentially attacked two mosques in Christchurch, New Zealand, killing 51 people aged from 3 to 77 years and bullet-injuring 40 more. Approximately 250 people survived the atrocity, and many more family and community members have been directly or indirectly affected.
Aim: To develop an understanding of the personal experiences of some of those affected, including effects on daily life and well-being, in the 18-30 months following the attacks.
Radiol Case Rep
December 2024
Department of Radiology, University of California, Davis, USA.
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