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Direct Observation of All-Flat Bands Phononic Metamaterials.
Phys Rev Lett
December 2024
University of Connecticut, University of Connecticut, School of Mechanical, Aerospace, and Manufacturing Engineering, Storrs, Connecticut 06269, USA and Institute of Materials Science, Storrs, Connecticut 06269, USA.
Flat lines within a band structure represent constant frequency bands for all momentum values (i.e., they maintain zero group velocity for all wave numbers).
View Article and Find Full Text PDFSituational analysis of the quality of maternal, child, and adolescent health data in the health districts of Thiès, Mbour, Kédougou, and Saraya in Senegal.
BMC Public Health
January 2025
Ministère de la Santé et de l'Action Sociale (MHSA), Dakar, Senegal.
Introduction: In Senegal, the Routine Health Information System (RHIS) captures the majority of data from the Ministry of Health and Social Action (MHSA) public structures and very little health data from the private sector and other ministerial departments. Quality data strengthens the validity and reliability of research results. Common areas of data quality include accuracy, completeness, consistency, credibility, and timeliness.
View Article and Find Full Text PDFResponding to: Rethinking Leadership in Academic Medicine: Embracing a Broader Definition of Success : Original article: Sticky Floor, Broken Ladder, and Glass Ceiling in Internal Medicine Academic Ranking, Leadership, and Research Productivity.
J Gen Intern Med
January 2025
Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada.
Postnatal experiences of teenage mothers in selected communities in Central Region, Ghana: a phenomenological study.
BMC Public Health
January 2025
Department of Population and Health, College of Humanities and Legal Studies, University of Cape Coast, Cape Coast, Ghana.
Background: Teenage childbirth is an issue of social and public health concern in Ghana, with high prevalence in some regions, including the Central Region. There is a dire need to understand the experiences of teenagers beyond pregnancies to facilitate comprehensive sexual and reproductive health information and service provision. We explored the postnatal experiences of teenage mothers in five communities in the Central Region of Ghana.
View Article and Find Full Text PDFSparse deconvolution beamforming with non-negative L1-αL2 regularization for acoustic source localization.
JASA Express Lett
January 2025
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
This letter proposed a sparse deconvolution localization method (FFT-L1ML2) driven by non-convex L1-αL2 regularization that more closely approximates the ideal L0 norm. It is an alternative that explores the sparse structure of sound sources to enhance localization accuracy, while the original sparse deconvolution beamforming lacks a sufficiently accurate sparse description. An optimization solver composed of forward gradient descent and backward proximal operator is then developed for the FFT-L1ML2 model to reconstruct the beamforming map.
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