Results 31 to 40 of about 2,185 (129)

Almost Hadamard matrices: general theory and examples

, 2012
We develop a general theory of "almost Hadamard matrices". These are by definition the matrices $H\in M_N(\mathbb R)$ having the property that $U=H/\sqrt{N}$ is orthogonal, and is a local maximum of the 1-norm on O(N).
Banica, Teodor, Nechita, Ion, Zyczkowski, Karol   +2 more
core   +3 more sources

Pairwise transitive 2-designs [PDF]

, 2015
We classify the pairwise transitive 2-designs, that is, 2-designs such that a group of automorphisms is transitive on the following five sets of ordered pairs: point-pairs, incident point-block pairs, non-incident point-block pairs, intersecting block ...
Devillers, Alice, Praeger, Cheryl E.
core   +1 more source

A U‐shaped relationship between left ventricular ejection fraction and risk of worsening heart failure

European Journal of Heart Failure, Volume 27, Issue 12, Page 2938-2947, December 2025.
A U‐shaped relationship between left ventricular ejection fraction (LVEF) and clinical outcomes. A U‐shaped relationship can be observed between LVEF, the primary outcome, and the cardiovascular‐related outcomes, including cardiovascular death and the risk of worsening heart failure (HF).
Hao‐Chih Chang, Wei‐Ming Huang, Liang‐Yin Lin, Ching‐Wei Lee, Chih‐Hsueh Tseng, Wen‐Chung Yu, Hao‐Min Cheng, Chern‐En Chiang, Chen‐Huan Chen, Shih‐Hsien Sung   +9 more
wiley   +1 more source

Reference left atrial dimensions and volumes by steady state free precession cardiovascular magnetic resonance [PDF]

, 2010
Background Left atrial (LA) size is related to cardiovascular morbidity and mortality. Cardiovascular magnetic resonance (CMR) provides high quality images of the left atrium with high temporal resolution steady state free precession (SSFP ...
Alicia M Maceira, Juan Cosín-Sales, Michael Roughton, Sanjay K Prasad, Dudley J Pennell   +4 more
core   +1 more source

Artificial intelligence‐based echocardiographic assessment for monitoring disease progression in transthyretin cardiac amyloidosis

European Journal of Heart Failure, Volume 27, Issue 12, Page 3392-3400, December 2025.
Artificial intelligence (AI)‐based estimation of stroke volume for risk prediction in amyloid transthyretin cardiomyopathy (ATTR‐CM). ATTRv, hereditary transthyretin amyloidosis; ATTRwt, wild‐type transthyretin amyloidosis; CI, confidence interval; HR, hazard ratio; IQR, interquartile range; LVOT‐VTI, left ventricular outflow tract velocity‐time ...
Lucia Venneri, Alberto Aimo, Aldostefano Porcari, Irem Sezer, Adam Ioannou, Awais Sheikh, Josephine Mansell, Yousuf Razvi, Surabhi Bhaskar Iyer, Ana Martinez‐Naharro, Francesco Bandera, Sze Chi Lim, Matthew Frost, Justin Ezekowitz, Carolyn S.P. Lam, William Moody, Carol Whelan, Helen Lachmann, Ashutosh Wechelakar, Michele Emdin, Philip N. Hawkins, Scott David Solomon, Julian D. Gillmore, Marianna Fontana   +23 more
wiley   +1 more source

Lumbopelvic Kinematics During Functional Tasks in a Chronic Low Back Pain Observational Cohort

JOR SPINE, Volume 8, Issue 4, December 2025.
The University of Pittsburgh Mechanistic Research Center, entitled, “Low Back Pain: Biological, Biomechanical, Behavioral Phenotypes (LB3P),” is part of the National Institutes of Health's Helping to End Addiction Long‐term Initiative. LB3P conducted a prospective, observational cohort study to identify phenotypes of over 1000 participants with chronic
Kevin M. Bell, Rachel E. Roos, Zakiy Alfikri, William Anderst, Anna Bailes, William W. Clark, Harold A. Cook, Jessa Darwin, Marit Johnson, Gina P. McKernan, Sebastian Murati, Bambang Parmanto, Nam V. Vo, Leming Zhou, Gwendolyn A. Sowa   +14 more
wiley   +1 more source

A wind tunnel two-dimensional parametric investigation of biplane configurations [PDF]

, 2014
This paper presents an experimental and systematic investigation about how geometric parameters on a biplane configuration have an influence on aerodynamic parameters.
Barcala Montejano, Miguel Angel, Morales-Serrano, Sara, Rodriguez Sevillano, Angel, Rodríguez Rojo, María Elena   +3 more
core   +1 more source

Artificial Intelligence Guided Nonexpert Echocardiogram in the COVID‐19 Health Action Response in Marines 2.0 Study

Sonography, Volume 12, Issue 4, Page 461-471, December 2025.
ABSTRACT Purpose Echocardiography is a widely utilized cardiac imaging modality, but accessibility can be limited by cost and lack of skilled sonographers. We demonstrate the use of point‐of‐care ultrasound (POCUS) with an embedded deep learning algorithm to guide novice users in obtaining diagnostic‐quality echocardiographic images and ejection ...
Andrew G. Letizia, Elizabeth S. Cooper, Charmagne G. Beckett, Chad K. Porter, Carl W. Goforth, Randolph P. Martin, David B. Adams, Andrew Marra, Michele Temple‐Wong, Dylan E. Wessman, M. Alaric Franzos   +10 more
wiley   +1 more source

Large Edge-non-vulnerable Graphs [PDF]

, 2011
In this paper we study the graphs such that the deletion of any edge does not increase the diameter. We give some upper bounds for the order of such a graph with given maximum degree and diameter.
Delorme, Charles
core  

Left Ventricular Mass Index and Relative Wall Thickness Predict Atrial High‐Rate Episodes in Patients With Pacemaker Implantation

Echocardiography, Volume 42, Issue 12, December 2025.
ABSTRACT Background Previous studies have shown that atrial high‐rate episodes (AHREs) after cardiac device implantation are associated with the occurrence of stroke. This study aimed to explore the predictive value of echocardiographic indices, namely left ventricular mass index (LVMI) and relative wall thickness (RWT), for AHREs following ...
Qin Zhang, Limin Xiang, Gege Zhao, Enbo Zhan, Jiali Tian   +4 more
wiley   +1 more source