122,628 results match your criteria ground


Anisotropic compliance of robot legs improves recovery from swing-phase collisions.

Bioinspir Biomim 2021 Jun 15. Epub 2021 Jun 15.

Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr, La Jolla, California, 92093, UNITED STATES.

Uneven terrain in natural environments challenges legged locomotion by inducing instability and causing limb collisions. During the swing phase, the limb releases from the ground and arcs forward to target a secure next foothold. In natural environments leg-obstacle collisions may occur during the swing phase which can result in instability, and may require contact sensing and trajectory re-planning if a collision occurs. Read More

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Radiological findings of e-cigarette or vaping product use associated lung injury: A systematic review.

Heart Lung 2021 Jun 12;50(5):736-741. Epub 2021 Jun 12.

Melbourne Medical School, University of Melbourne, Melbourne, VIC, 3010, Australia; Department of Radiology, Royal Melbourne Hospital, Melbourne VIC, 3010, Australia.

Introduction: Chest radiology provides an opportunity to better understand the diagnostic characteristics of e-cigarette or vaping product use associated lung injury (EVALI). This systematic review aimed to summarize the radiological findings associated with EVALI reported in the literature.

Methods: This systematic review was conducted in accordance with PRISMA guidelines. Read More

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Reconstituted mRNA Covid-19 vaccines may maintain stability after continuous movement.

Clin Microbiol Infect 2021 Jun 12. Epub 2021 Jun 12.

Laboratory of Neuropharmacology-Neurophar, Department of Experimental and Health Sciences, Universitat Pompeu Fabra (UPF), Barcelona, Spain; Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain. Electronic address:

Objectives: There is an urgent need to ameliorate the possibilities to transport the reconstituted mRNA vaccines from the centralized preparation centers to the vaccination sites to improve the COVID-19 vaccination campaigns. We have analyzed Pfizer-BioNTech and Moderna vaccine integrity under different movement conditions to provide information that may improve the distribution of vaccines to the target population.

Methods: Syringes of reconstituted Pfizer-BioNTech or Moderna COVID-19 vaccines were prepared in a laminar flow chamber to be subjected to a stability analysis in order to evaluate the impact of movement conditions on mRNA integrity. Read More

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A 1-km hourly air-temperature model for 13 northeastern U.S. states using remotely sensed and ground-based measurements.

Environ Res 2021 Jun 12:111477. Epub 2021 Jun 12.

Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Institute for Exposomic Research, Icahn School of Medicine at Mount Sinai, New York, USA.

Background: Accurate and precise estimates of ambient air temperatures that can capture fine-scale within-day variability are necessary for studies of air temperature and health.

Method: We developed statistical models to predict temperature at each hour in each cell of a 927-m square grid across the Northeast and Mid-Atlantic United States from 2003 to 2019, across ∼4000 meteorological stations from the Integrated Mesonet, using inputs such as elevation, an inverse-distance-weighted interpolation of temperature, and satellite-based vegetation and land surface temperature. We used a rigorous spatial cross-validation scheme and spatially weighted the errors to estimate how well model predictions would generalize to new cell-days. Read More

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The oldest peracarid crustacean reveals a Late Devonian freshwater colonization by isopod relatives.

Biol Lett 2021 Jun 16;17(6):20210226. Epub 2021 Jun 16.

Department of Taxonomy and Systematics, Naturalis Biodiversity Center, 9517, 2300 RA Leiden, The Netherlands.

Peracarida (e.g. woodlice and side-swimmers) are, together with their sister-group Eucarida (e. Read More

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Differential Clinical Diagnosis and Prevalence Rate of Allergic Rhinitis, Asthma, and Chronic Obstructive Pulmonary Disease among COVID-19 Patients.

Int J Clin Pract 2021 Jun 15:e14532. Epub 2021 Jun 15.

Clinical Pharmacy Department, Faculty of Pharmacy, Beni-suef University, Beni-suef, Egypt.

Background: There is a great need to make a rapid differential clinical diagnosis of COVID-19 among respiratory disease patients and determining the prevalence rate of these diseases among the COVID-19 population.

Method: Approximately 522 patients with allergic rhinitis, asthma, COPD, and COVID-19 were analyzed for demographic and clinical features. Radiological features were analyzed only for COVID-19 patients. Read More

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Comparison of foot strike sound between rearfoot, midfoot and forefoot strike runners.

J Athl Train 2021 Jun 15. Epub 2021 Jun 15.

Gait & Motion Analysis Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.

Context: There are three common foot strike techniques in runners. Whether these techniques generate different sounds at the point of impact with the ground may influence lower limb kinetics. No previous studies have determined whether such relationships exist. Read More

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Room temperature atomic frequency comb storage for light.

Opt Lett 2021 Jun;46(12):2960-2963

We demonstrate coherent storage and retrieval of pulsed light using the atomic frequency comb protocol in a room temperature alkali vapor. We utilize velocity-selective optical pumping to prepare multiple velocity classes in the =4 hyperfine ground state of cesium. The frequency spacing of the classes is chosen to coincide with the =4-=5 hyperfine splitting of the 6 excited state, resulting in a broadband periodic absorbing structure consisting of two usually Doppler-broadened optical transitions. Read More

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Gigahertz-bandwidth optical memory in Pr:YSiO.

Opt Lett 2021 Jun;46(12):2948-2951

We experimentally study a broadband implementation of the atomic frequency comb (AFC) rephasing protocol with a cryogenically cooled : crystal. To allow for storage of broadband pulses, we explore a novel, to the best of our knowledge, regime where the input photonic bandwidth closely matches the inhomogeneous broadening of the material (∼5), thereby significantly exceeding the hyperfine ground and excited state splitting (∼10). Through an investigation of different AFC preparation parameters, we measure a maximum efficiency of 10% after a rephasing time of 12. Read More

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REPAID: resolution-enhanced plenoptic all-in-focus imaging using deep neural networks.

Opt Lett 2021 Jun;46(12):2896-2899

Due to limited depth-of-focus, classical 2D images inevitably lose details of targets out of depth-of-focus, while all-in-focus images break through the limit by fusing multi-focus images, thus being able to focus on targets in extended depth-of-view. However, conventional methods can hardly obtain dynamic all-in-focus imaging in both high spatial and temporal resolutions. To solve this problem, we design REPAID, meaning resolution-enhanced plenoptic all-in-focus imaging using deep neural networks. Read More

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Pre-Treatment with dual antiplatelet therapy in Non-ST-Segment elevation acute coronary syndromes: Landing from guidelines recommendations to Real-World ground.

Authors:
Leonardo De Luca

Eur Heart J Cardiovasc Pharmacother 2021 Jun 15. Epub 2021 Jun 15.

Department of Cardiosciences, A.O. San Camillo-Forlanini, Roma, Italy.

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Integrated transcriptomic analysis of human tuberculosis granulomas and a biomimetic model identifies therapeutic targets.

J Clin Invest 2021 Jun 15. Epub 2021 Jun 15.

School of Clinical and Experimental Sciences, University of Southampton, Faculty of Medicine, Southampton, United Kingdom.

Tuberculosis (TB) is a persistent global pandemic and standard treatment has not changed for thirty years. Mycobacterium tuberculosis (Mtb) has undergone prolonged co-evolution with humans, and patients can control Mtb even after extensive infection, demonstrating the fine balance between protective and pathological host responses within infected granulomas. We hypothesised that whole transcriptome analysis of human TB granulomas isolated by laser capture microdissection could identify therapeutic targets, and that comparison with a non-infectious granulomatous disease, sarcoidosis, would identify disease-specific pathological mechanisms. Read More

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Methane emissions from above-ground natural gas distribution facilities in the urban environment: a fence line methodology and case study in Calgary, Alberta, Canada.

J Air Waste Manag Assoc 2021 Jun 15. Epub 2021 Jun 15.

Department of Geography, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4.

The occurrence and emissions of methane (CH) from above-ground urban natural gas infrastructure is poorly understood. Compared to below-ground infrastructure, these facilities are relatively easy to monitor and maintain and present an opportunity for cost-effective CH reductions. We present a case study and methodology for detecting, attributing, and quantifying CH emissions from fence line measurements at above-ground natural gas facilities in the City of Calgary, Alberta, Canada. Read More

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Cost-Effectiveness of Treatment Thresholds for Subsolid Pulmonary Nodules in CT Lung Cancer Screening.

Radiology 2021 Jun 15:204418. Epub 2021 Jun 15.

From the Department of Radiology (Thoracic Division), Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115 (M.M.H.); Institute of Technology Assessment, Massachusetts General Hospital, Boston, Mass (A.L.E.); Department of Statistical Science, Duke University, Durham, NC (L.L.P.); and Icahn School of Medicine at Mount Sinai, New York, NY (C.Y.K.).

Background Guidelines such as the Lung CT Screening Reporting and Data System (Lung-RADS) are available for determining when subsolid nodules should be treated within lung cancer screening programs, but they are based on expert opinion. Purpose To evaluate the cost-effectiveness of varying treatment thresholds for subsolid nodules within a lung cancer screening setting by using a simulation model. Materials and Methods A previously developed model simulated 10 million current and former smokers undergoing CT lung cancer screening who were assumed to have a ground-glass nodule (GGN) at baseline. Read More

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Nonadiabatic Molecular Dynamics Study of the Relaxation Pathways of Photoexcited Cyclooctatetraene.

J Phys Chem Lett 2021 Jun 15:5716-5722. Epub 2021 Jun 15.

Physics and Chemistry of Materials, Theoretical Division, Los Alamos National Laboratory, Los Alamos 87545, New Mexico, United States.

In the current study, we present nonadiabatic (NAMD) and adiabatic molecular dynamics simulations of the transition-state dynamics of photoexcited cyclooctatetraene (COT). The equilibrium-state structure and absorption spectra are analyzed using the semiempirical Austin Model 1 potential. The NAMD simulations are obtained by a surface-hopping algorithm. Read More

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Dianionic States of Trithiadodecaazahexaphyrin Complexes with Homotrinuclear MO Clusters (M = Ni and Cu): Crystal Structures, Metal- Or Macrocycle-Centered Reduction, and Doublet-Quartet Transitions in the Dianions.

Inorg Chem 2021 Jun 15. Epub 2021 Jun 15.

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia.

Metal complexes of trithiadodecaazahexaphyrin (Hhp) that contain MO clusters inside a π-extended trianionic (Hhp) macrocycle have been prepared. Studies of the magnetic properties of NiO(Hhp) and CuO(Hhp) reveal a diamagnetic and EPR-silent trianionic (Hhp) macrocycle and diamagnetic Ni(O) or paramagnetic Cu(O) tetracations. The positive charge of MO(Hhp) is compensated by one acetate anion {MO(Hhp)}(CHCO). Read More

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Mental health of children with neurodevelopmental disorders during COVID-19: A brief report of family experiences from a low and middle income country.

Clin Child Psychol Psychiatry 2021 Jun 15:13591045211026058. Epub 2021 Jun 15.

Center for Advanced Research and Excellence in Autism and Developmental Disorders (CAREADD), St. John's Medical College, Bangalore, Karnataka, India.

COVID-19 has grossly impacted lives of people across the globe. In particular, children have also been affected due to closure of schools, therapy, and day care centers. Families have been challenged with new circumstances, and mental health professionals are coming up with novel ways to help these families who have children with mental health issues. Read More

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Numerical Simulation of Solute Transport in Saturated Porous Media with Bounded Domains.

Ground Water 2021 Jun 14. Epub 2021 Jun 14.

Department of Water Science and Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran.

This work presents the first attempt to develop unconditionally stable, implicit finite difference solutions of one-sided spatial fractional advection-dispersion equation (s-FADE) by imposing the nonzero Dirichlet boundary condition (ND BC) or the nonzero fractional Robin boundary condition (NFR BC) at inlet boundary and the zero fractional Neumann boundary condition (ZFN BC) at outlet boundary. The results of the numerical studies performed using artificial solute transport parameters demonstrated that the numerical solution with the NFR BC as the inlet boundary produced much more realistic concentration values. The numerical solution with the NFR BC at the inlet boundary was capable of correctly describing the Fickian and non-Fickian behaviors of the solute transport at different α values, and it had the relatively same accuracy at different numbers of the spatial nodes. Read More

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Use of the MODFLOW 6 water mover package to represent natural and managed hydrologic connections.

Ground Water 2021 Jun 14. Epub 2021 Jun 14.

Integrated Modeling and Prediction Division, U.S. Geological Survey, 12201 Sunrise Valley Dr, Reston, VA, 20192.

The latest release of MODFLOW 6, the current core version of the MODFLOW groundwater modeling software, debuted a new package dubbed the "mover" (MVR). Using a generalized approach, MVR facilitates the transfer of water among any arbitrary combination of simulated features (i.e. Read More

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What Should We Manage: Aquifers or Groundwater?

Authors:
Alfonso Rivera

Ground Water 2021 Jun 15. Epub 2021 Jun 15.

Geological Survey of Canada, Canada.

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Impacts of COVID-19 lockdown on NO and PM levels in major urban cities of Europe and USA.

Cities 2021 Jun 10:103308. Epub 2021 Jun 10.

Wilmer Eye Institute, Johns Hopkins University School of Medicine, 600N Wolfe Street, Baltimore, -21287, MD, United States of America.

SARS CoV-2 (COVID-19) coronavirus has been causing enormous suffering, death, and economic losses worldwide. There are rigorous containment measures on industries, non-essential business, transportation, and citizen mobility to check the spread. The lockdowns may have an advantageous impact on reducing the atmospheric pollutants. Read More

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Design of a miniaturized ultrawideband and low scattering antipodal vivaldi antenna array.

Sci Rep 2021 Jun 14;11(1):12499. Epub 2021 Jun 14.

State Key Laboratory of Media Convergence and Communication, Communication University of China, Beijing, 100024, China.

This paper presents a miniaturized ultra-wideband (UWB) antipodal Vivaldi antenna (AVA) array with low-scattering characteristics integrated a hybrid diffusive-absorptive metasurface. Periodic elliptical slots at the outer edges and a dielectric lens are utilized for antenna element to improve performances including miniaturized size, wide bandwidth, and high gain. The optimized element is fabricated and measured, the results demonstrate that the - 10 dB impedance bandwidth is 4. Read More

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Inter-vendor performance of deep learning in segmenting acute ischemic lesions on diffusion-weighted imaging: a multicenter study.

Sci Rep 2021 Jun 14;11(1):12434. Epub 2021 Jun 14.

Department of Radiology, Acibadem Mehmet Ali Aydinlar University School of Medicine, Istanbul, Turkey.

There is little evidence on the applicability of deep learning (DL) in the segmentation of acute ischemic lesions on diffusion-weighted imaging (DWI) between magnetic resonance imaging (MRI) scanners of different manufacturers. We retrospectively included DWI data of patients with acute ischemic lesions from six centers. Dataset A (n = 2986) and B (n = 3951) included data from Siemens and GE MRI scanners, respectively. Read More

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Lattice quantum electrodynamics in (3+1)-dimensions at finite density with tensor networks.

Nat Commun 2021 Jun 14;12(1):3600. Epub 2021 Jun 14.

Dipartimento di Fisica e Astronomia G. Galilei, Università di Padova, Padova, Italy.

Gauge theories are of paramount importance in our understanding of fundamental constituents of matter and their interactions. However, the complete characterization of their phase diagrams and the full understanding of non-perturbative effects are still debated, especially at finite charge density, mostly due to the sign-problem affecting Monte Carlo numerical simulations. Here, we report the Tensor Network simulation of a three dimensional lattice gauge theory in the Hamiltonian formulation including dynamical matter: Using this sign-problem-free method, we simulate the ground states of a compact Quantum Electrodynamics at zero and finite charge densities, and address fundamental questions such as the characterization of collective phases of the model, the presence of a confining phase at large gauge coupling, and the study of charge-screening effects. Read More

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Sex Difference in Hip Adduction during the Stance Phase of Running: A Swing Phase Problem?

Med Sci Sports Exerc 2021 Jul;53(7):1412-1416

Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA.

Purpose: The purpose of the current study was 1) to evaluate sex differences in peak hip adduction during the late swing and stance phases of running and 2) to determine whether peak hip adduction during late swing is predictive of peak hip adduction during stance.

Methods: A total of 15 female and 16 male heel strike runners ran over ground at a speed of 4 m·s-1. Hip joint kinematics during running were quantified using a 3D motion capture system. Read More

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Biomechanical Effects of a 6-Week Change-of-Direction Technique Modification Intervention on Anterior Cruciate Ligament Injury Risk.

J Strength Cond Res 2021 Jun 11. Epub 2021 Jun 11.

Human Performance Laboratory, Directorate of Sport, Exercise, and Physiotherapy, University of Salford, Greater Manchester, United Kingdom; Department of Sport and Exercise Sciences, Musculoskeletal Science and Sports Medicine Research Centre, Manchester Metropolitan University, Manchester, United Kingdom; and Edith Cowan University, School of Medical and Health Science, Western Australia, Australia.

Abstract: Dos'Santos, T, Thomas, C, Comfort, P, and Jones, PA. Biomechanical effects of a 6-week change-of-direction technique modification intervention on anterior cruciate ligament injury risk. J Strength Cond Res XX(X): 000-000, 2021-The aim of this study was to evaluate the biomechanical effects of a 6-week change-of-direction (COD) technique modification intervention on anterior cruciate ligament (ACL) injury risk (i. Read More

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CT ​EvaLuation ​by ​ARtificial ​Intelligence ​For ​Atherosclerosis, Stenosis and Vascular ​MorphologY ​(CLARIFY): ​A ​Multi-center, international study.

J Cardiovasc Comput Tomogr 2021 Jun 12. Epub 2021 Jun 12.

Department of Radiology, The George Washington University School of Medicine, Washington, DC, USA.

Background: Atherosclerosis evaluation by coronary computed tomography angiography (CCTA) is promising for coronary artery disease (CAD) risk stratification, but time consuming and requires high expertise. Artificial Intelligence (AI) applied to CCTA for comprehensive CAD assessment may overcome these limitations. We hypothesized AI aided analysis allows for rapid, accurate evaluation of vessel morphology and stenosis. Read More

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Phytoremediation of azoxystrobin and imidacloprid by wetland plant species , and .

Int J Phytoremediation 2021 Jun 14:1-9. Epub 2021 Jun 14.

Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA.

Azoxystrobin (strobilurin fungicide) and imidacloprid (neonicotinoid insecticide) have been detected in surface waters near treated agricultural, urban, and mixed landscapes. The hazards of pesticide runoff can be prevented through best management practices, including the establishment of diverse wetland plant barriers that can phytoremediate the chemicals in which they come into contact with. In this study, the wetland plant species softrush (), pickerelweed (), and arrowhead ( were planted in sandy soil containers that were then placed in azoxystrobin or imidacloprid treated water. Read More

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Mechanisms of IR amplification in radical cation polarons.

Chem Sci 2020 Jan 22;11(8):2112-2120. Epub 2020 Jan 22.

Department of Chemistry, University of Oxford, Chemistry Research Laboratory Oxford OX1 3TA UK

Break down of the Born-Oppenheimer approximation is caused by mixing of electronic and vibrational transitions in the radical cations of some conjugated polymers, resulting in unusually intense vibrational bands known as infrared active vibrations (IRAVs). Here, we investigate the mechanism of this amplification, and show that it provides insights into intramolecular charge migration. Spectroelectrochemical time-resolved infrared (TRIR) and two-dimensional infrared (2D-IR) spectroscopies were used to investigate the radical cations of two butadiyne-linked conjugated porphyrin oligomers, a linear dimer and a cyclic hexamer. Read More

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January 2020