31,046 results match your criteria root square

Higher order aberrations and retinal image quality during short-term accommodation in children.

Vision Res 2021 Jul 19;188:74-84. Epub 2021 Jul 19.

Queensland University of Technology, Contact Lens and Visual Optics Laboratory, School of Optometry and Vision Science, Centre for Vision and Eye Research, Brisbane, Queensland, Australia.

Changes in higher order aberrations (HOA's) and retinal image quality during accommodation have not previously been examined in children. This study measured ocular HOA's in ninety non-myopic, school-aged children during short-term accommodation tasks at 0, 3, 6, and 9 D demands presented via a Badal optometer mounted to a Hartmann-Shack wavefront aberrometer (COAS-HD, Wavefront Sciences). Eighty-four participants who exhibited active accommodation were included in the analyses. Read More

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Relationship of proprioception, cutaneous sensitivity, and muscle strength with the balance control among older adults.

J Sport Health Sci 2021 Jul 19. Epub 2021 Jul 19.

Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai 200438, China; Department of Health Sciences and Kinesiology, Georgia Southern University, Statesboro, GA 30460, USA. Electronic address:

Purpose: Balance impairment is one of the strongest risk factors for falls. Proprioception, cutaneous sensitivity, and muscle strength are 3 important contributors to balance control in older adults. The relationship that dynamic and static balance control has to proprioception, cutaneous sensitivity, and muscle strength is still unclear. Read More

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Probe into the Molecular Mechanism of Ibuprofen Interaction with Warfarin Bound to Human Serum Albumin in Comparison to Ascorbic and Salicylic Acids: Allosteric Inhibition of Anticoagulant Release.

J Chem Inf Model 2021 Jul 22. Epub 2021 Jul 22.

Biochemistry Research Laboratory, Chemistry Department, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran.

The release of anticoagulant drugs such as warfarin from human serum albumin (HSA) has been important not only mechanistically but also clinically for patients who take multiple drugs simultaneously. In this study, the role of some commonly used drugs, including -ibuprofen, ascorbic acid, and salicylic acid, was investigated in the release of warfarin bound to HSA . The effects of the aforementioned drugs on the HSA-warfarin complex were investigated with molecular dynamics (MD) simulations using two approaches; in the first perspective, molecular docking was used to model the interaction of each drug with the HSA-warfarin complex, and in the second approach, drugs were positioned randomly and distant from the binary complex (HSA-warfarin) in a physiologically relevant concentration. Read More

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An Automatic and Simplified Approach to Muscle Path Modelling.

J Biomech Eng 2021 Jul 22. Epub 2021 Jul 22.

Univ Rennes, Inria, CNRS, IRISA, France.

The current paper aims at proposing an automatic method to design and adjust simplified muscle paths of a musculoskeletal model. These muscle paths are composed of a limited set of via points and an optimization routine is developed to place these via points on the model in order to fit moment arms and musculotendon lengths input data. The method has been applied to a forearm musculoskeletal model extracted from the literature, using theoretical input data as an example. Read More

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Time-Dependent Long-Range-Corrected Double-Hybrid Density Functionals with Spin-Component and Spin-Opposite Scaling: A Comprehensive Analysis of Singlet-Singlet and Singlet-Triplet Excitation Energies.

J Chem Theory Comput 2021 Jul 22. Epub 2021 Jul 22.

School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia.

Following the work on spin-component and spin-opposite scaled (SCS/SOS) global double hybrids for singlet-singlet excitations by Schwabe and Goerigk [ 2017, 13, 4307-4323] and our own works on new long-range corrected (LC) double hybrids for singlet-singlet and singlet-triplet excitations [ 2019, 15, 4735-4744 and 2020, 153, 064106], we present new LC double hybrids with SCS/SOS that demonstrate further improvement over previously published results and methods. We introduce new unscaled and scaled versions of different global and LC double hybrids based on Becke88 or PBE exchange combined with LYP, PBE, or P86 correlation. For singlet-singlet excitations, we cross-validate them on six benchmark sets that cover small to medium-sized chromophores with different excitation types (local-valence, Rydberg, and charge transfer). Read More

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The Optimal Machine Learning-Based Missing Data Imputation for the Cox Proportional Hazard Model.

Front Public Health 2021 5;9:680054. Epub 2021 Jul 5.

Institute of Statistical Science, Academia Sinica, Taipei, Taiwan.

An adequate imputation of missing data would significantly preserve the statistical power and avoid erroneous conclusions. In the era of big data, machine learning is a great tool to infer the missing values. The root means square error (RMSE) and the proportion of falsely classified entries (PFC) are two standard statistics to evaluate imputation accuracy. Read More

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Smartphone-recorded physical activity for estimating cardiorespiratory fitness.

Sci Rep 2021 Jul 21;11(1):14851. Epub 2021 Jul 21.

Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, MA, USA.

While cardiorespiratory fitness is strongly associated with mortality and diverse outcomes, routine measurement is limited. We used smartphone-derived physical activity data to estimate fitness among 50 older adults. We recruited iPhone owners undergoing cardiac stress testing and collected recent iPhone physical activity data. Read More

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Determination of hardness for maize kernels based on hyperspectral imaging.

Food Chem 2021 Jul 8;366:130559. Epub 2021 Jul 8.

College of Engineering, China Agricultural University, NO. 17 Qinghua East Road, Beijing 100083, PR China.

In order to realize rapid and non-destructive detection of hardness for maize kernels, a method for quantitative hardness measurement was proposed based on hyperspectral imaging technology. Firstly, the regression model of hardness and moisture content was established. Then, based on reflectance hyperspectral imaging at wavelengths within 399. Read More

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Increased exhalation to inhalation ratio during breathing enhances high-frequency heart rate variability in healthy adults.

Psychophysiology 2021 Jul 20:e13905. Epub 2021 Jul 20.

Rotman Research Institute, Baycrest Health Sciences, Toronto, ON, Canada.

Heart rate variability (HRV) is a well-established surrogate of cardiac and emotional health that reflects the balance between sympathetic and parasympathetic activity of the autonomic nervous system. We examined the impact of manipulating exhalation to inhalation ratio (E:I) on HRV, without altering the intrinsic breathing rate of healthy individuals. We hypothesized that a longer exhalation relative to inhalation (E:I > 1) would shift HRV metrics in a direction consistent with increased parasympathetic activity. Read More

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Application of an integrated radio-frequency/shim coil technology for signal recovery in fMRI.

Magn Reson Med 2021 Jul 20. Epub 2021 Jul 20.

Brain Imaging and Analysis Center, Duke University, Durham, North Carolina, USA.

Purpose: Gradient-echo echo-planar imaging (EPI), which is typically used for blood oxygenation level-dependent (BOLD) functional MRI (fMRI), suffers from distortions and signal loss caused by localized B inhomogeneities. Such artifacts cannot be effectively corrected for with the low-order spherical harmonic (SH) shim coils available on most scanners. The integrated parallel reception, excitation, and shimming (iPRES) coil technology allows radiofrequency (RF) and direct currents to flow on each coil element, enabling imaging and localized B shimming with one coil array. Read More

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Association of polyunsaturated fatty acids with improved heart rate variability and cardiovascular events in patients with end-stage renal disease receiving maintenance dialysis: a systematic review and meta-analysis of randomized controlled trials.

Food Funct 2021 Jul 21. Epub 2021 Jul 21.

Division of Nephrology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan. and TMU Research Center of Urology and Kidney, Taipei Medical University, Taipei, Taiwan and Division of Nephrology, Department of Internal Medicine, Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan.

Objective: Apart from dietary restriction and medical therapy, the benefits of cardiovascular protection offered by polyunsaturated fatty acid (PUFA) supplements in patients with ESRD receiving maintenance dialysis remain unclear. This systematic review and meta-analysis examined the effects of PUFAs on blood pressure, heart rate (HR), HR variability (HRV), and cardiovascular disease (CVD) prognosis.

Methods: We identified randomized controlled trials (RCTs) from Embase, PubMed (including MEDLINE), and Web of Science. Read More

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Dual-Energy Computed Tomography Proton-Dose Calculation with Scripting and Modified Hounsfield Units.

Int J Part Ther 2021 25;8(1):62-72. Epub 2021 Jun 25.

Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA.

Purpose: To describe an implementation of dual-energy computed tomography (DECT) for calculation of proton stopping-power ratios (SPRs) in a commercial treatment-planning system. The process for validation and the workflow for safe deployment of DECT is described, using single-energy computed tomography (SECT) as a safety check for DECT dose calculation.

Materials And Methods: The DECT images were acquired at 80 kVp and 140 kVp and were processed with computed tomography scanner software to derive the electron density and effective atomic number images. Read More

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Structure-based approaches for drug discovery against .

Comput Struct Biotechnol J 2021 24;19:3708-3719. Epub 2021 Jun 24.

Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.

is the causative agent of TB and was estimated to cause 1.4 million death in 2019, alongside 10 million new infections. Drug resistance is a growing issue, with multi-drug resistant infections representing 3. Read More

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Genetic analysis of egg production traits in turkeys (Meleagris gallopavo) using a single-step genomic random regression model.

Genet Sel Evol 2021 Jul 20;53(1):61. Epub 2021 Jul 20.

Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, N1G 2W1, Canada.

Background: Egg production traits are economically important in poultry breeding programs. Previous studies have shown that incorporating genomic data can increase the accuracy of genetic prediction of egg production. Our objective was to estimate the genetic and phenotypic parameters of such traits and compare the prediction accuracy of pedigree-based random regression best linear unbiased prediction (RR-PBLUP) and genomic single-step random regression BLUP (RR-ssGBLUP). Read More

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A sensor to monitor limb depth in transtibial sockets with locking pin suspension: a technical note.

Prosthet Orthot Int 2021 Jul 19. Epub 2021 Jul 19.

Department of Bioengineering, University of Washington, Seattle, WA, USA.

Background: Monitoring of limb depth in transtibial sockets may provide useful information toward patient education and care.

Objective: The objective was to develop a sensor to detect the depth of a locking pin in the shuttle lock of a transtibial socket and to monitor the small motions between ratchet clicks during ambulation.

Study Design: Controlled bench testing and single-participant study. Read More

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Development and Validation of a Predictive Model for Outcomes in Shoulder Arthroplasty: A Multicenter Analysis of over 2000 Patients.

J Shoulder Elbow Surg 2021 Jul 17. Epub 2021 Jul 17.

University of Tennessee-Campbell Foundation Department of Orthopaedic Surgery & Biomedical Engineering, Memphis, TN, USA. Electronic address:

Background: Guiding expectations following shoulder arthroplasty is important in improving patient satisfaction. The purpose of this study was to develop a predictive model to calculate 2-year American Shoulder and Elbow Surgeons (ASES) scores in shoulder arthroplasty patients from a comprehensive set of preoperative patient factors and types of arthroplasty performed.

Methods: This retrospective multicenter study included 1947 shoulder arthroplasties performed from 2010 to 2015 at three high-volume centers. Read More

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Feature Matching Combining Radiometric and Geometric Characteristics of Images, Applied to Oblique- and Nadir-Looking Visible and TIR Sensors of UAV Imagery.

Sensors (Basel) 2021 Jul 4;21(13). Epub 2021 Jul 4.

School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Korea.

A large amount of information needs to be identified and produced during the process of promoting projects of interest. Thermal infrared (TIR) images are extensively used because they can provide information that cannot be extracted from visible images. In particular, TIR oblique images facilitate the acquisition of information of a building's facade that is challenging to obtain from a nadir image. Read More

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Deep Learning Based Prediction on Greenhouse Crop Yield Combined TCN and RNN.

Sensors (Basel) 2021 Jul 1;21(13). Epub 2021 Jul 1.

Lincoln Institute for Agri-Food Technology, University of Lincoln, Lincoln LN6 7TS, UK.

Currently, greenhouses are widely applied for plant growth, and environmental parameters can also be controlled in the modern greenhouse to guarantee the maximum crop yield. In order to optimally control greenhouses' environmental parameters, one indispensable requirement is to accurately predict crop yields based on given environmental parameter settings. In addition, crop yield forecasting in greenhouses plays an important role in greenhouse farming planning and management, which allows cultivators and farmers to utilize the yield prediction results to make knowledgeable management and financial decisions. Read More

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Effect of vision loss on plasticity of the head and neck proprioception.

Int J Ophthalmol 2021 18;14(7):1059-1065. Epub 2021 Jul 18.

Department of Orthopedics, Chinese PLA General Hospital, Beijing 100853, China.

Aim: To investigate whether head and neck proprioception and motor control could be compensatory enhanced by long-term vision loss or impairment.

Methods: Individuals who were blind, low vision or sighted were included in the study, which would undergo the head repositioning test (HRT). The constant error (CE), absolute error (AE), variable error (VE) and root mean square error (RMSE) of each subject were statistically analyzed. Read More

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Development of a health behavior scale for older adults living alone receiving public assistance.

BMC Public Health 2021 Jul 19;21(1):1428. Epub 2021 Jul 19.

Department of Community and Public Health Nursing, Graduate School of Health Sciences and Faculty of Medicine, Hokkaido University, N12-W5, Kita-ku, Sapporo, 060-0812, Japan.

Background: To reduce health disparities, prevention of non-communicable diseases (NCD) by performing desirable health behavior in older adults living alone with low socioeconomic status is an essential strategy in public health. Self-perception of personal power and practical skills for daily health are key elements of desirable health behavior. However, methods for measuring these concepts have not been established. Read More

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Fusion-based framework for meteorological drought modeling using remotely sensed datasets under climate change scenarios: Resilience, vulnerability, and frequency analysis.

J Environ Manage 2021 Jul 16;297:113283. Epub 2021 Jul 16.

Department of Biological and Agricultural Engineering & Zachry Department of Civil & Environmental Engineering, Texas A&M University, College Station, TX, 77843-2117, USA. Electronic address:

Severe drought events in recent decades and their catastrophic effects have called for drought prediction and monitoring needed for developing drought readiness plans and mitigation measures. This study used a fusion-based framework for meteorological drought modeling for the historical (1983-2016) and future (2020-2050) periods using remotely sensed datasets versus ground-based observations and climate change scenarios. To this aim, high-resolution remotely sensed precipitation datasets, including PERSIANN-CDR and CHIRPS (multi-source products), ERA5 (reanalysis datasets), and GPCC (gauge-interpolated datasets), were employed to estimate non-parametric SPI (nSPI) as a meteorological drought index against local observations. Read More

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Accuracy and error cause analysis, and recommendations for usage of Himawari-8 aerosol products over Asia and Oceania.

Sci Total Environ 2021 Jul 16;796:148958. Epub 2021 Jul 16.

National Marine Environmental Monitoring Center, Dalian 116023, China.

The Himawari-8 aerosol algorithm was updated to version 3 (V30). However, no study has evaluated its performance. The purpose of this study is to verify and to compare version 2. Read More

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Viscoelasticity Modeling of Dielectric Elastomers by Kelvin Voigt-Generalized Maxwell Model.

Polymers (Basel) 2021 Jul 2;13(13). Epub 2021 Jul 2.

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China.

Dielectric elastomers (DEs) are polymer materials consisting of a network of polymer chains connected by covalent cross-links. This type of structural feature allows DEs to generate large displacement outputs owing to the nonlinear electromechanical coupling and time-dependent viscoelastic behavior. The major challenge is to properly actuate the nonlinear soft materials in applications of robotic manipulations. Read More

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ZnO Films Incorporation Study on Macroporous Silicon Structure.

Materials (Basel) 2021 Jul 1;14(13). Epub 2021 Jul 1.

Institute for Renewable Energy, Autonomus National University of Mexico, Priv. Xochicalco S/N, Temixco, Morelos 62580, Mexico.

In the present work, we developed hybrid nanostructures based on ZnO films deposited on macroporous silicon substrates using the sol-gel spin coating and ultrasonic spray pyrolysis (USP) techniques. The changes in the growth of ZnO films on macroporous silicon were studied using a UV-visible spectrometer, an X-ray diffractometer (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). XRD analysis revealed the beneficial influence of macroporous silicon on the structural properties of ZnO films. Read More

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SAMPL7 physical property prediction from EC-RISM theory.

J Comput Aided Mol Des 2021 Jul 19. Epub 2021 Jul 19.

Physikalische Chemie III, Technische Universität Dortmund, Otto-Hahn-Str. 4a, 44227, Dortmund, Germany.

Inspired by the successful application of the embedded cluster reference interaction site model (EC-RISM), a combination of quantum-mechanical calculations with three-dimensional RISM theory to predict Gibbs energies of species in solution within the SAMPL6.1 (acidity constants, pK) and SAMPL6.2 (octanol-water partition coefficients, log P) the methodology was applied to the recent SAMPL7 physical property challenge on aqueous pK and octanol-water log P values. Read More

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Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor.

ACS Omega 2021 Jul 1;6(27):17442-17454. Epub 2021 Jul 1.

Thin Films & Nanomaterials Research Laboratory, Department of Physics, Osmania University, Hyderabad, Telangana State 500 007, India.

Toluene gas is the most toxic and affects the respiratory system of humans, and thereby, its detection at lower levels is an important task. Herein, we report a room temperature-operatable indium oxide-based chemiresistive gas sensor, which detects 50 ppm toluene vapors. Nanocrystalline indium oxide (InO) films were sprayed on a pre-cleaned glass substrate using a cost-effective spray pyrolysis method at different substrate temperatures in the range of 350-500 °C. Read More

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Fast and Accurate Quantification of Nitrogen and Phosphorus Constituents in Animal Slurries Using NMR Sensor Technology.

ACS Omega 2021 Jul 29;6(27):17335-17341. Epub 2021 Jun 29.

NanoNord A/S, Skjernvej 4A, DK-9220 Aalborg Ø, Denmark.

The optimal processing of animal slurry with a minimal environmental impact either as an organic fertilizer or as an energy source for biogas production fundamentally requires accurate, fast, cost-effective, and mobile analytical techniques for the measurement of nitrogen and phosphorus in large volumes of liquid animal slurry. Based on more than 300 different slurries from different species and origins, we provide here an extensive analysis of low-field NMR and standard laboratory measurements for animal slurry analysis. It is found that low-field NMR provides higher precision than wet chemistry laboratory measurements for ammonium nitrogen and total nitrogen, while it provides slightly lower precision for total phosphorus measurements. Read More

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3D simulation of aneurysm clipping: Data analysis.

Data Brief 2021 Aug 3;37:107258. Epub 2021 Jul 3.

Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY, United States.

Aneurysm clipping requires the proficiency of several skills, yet the traditional way of practicing them has been recently challenged. The use of simulators could be an alternative educational tool. The aim of this data analysis is to provide further evaluation of a reusable low-cost 3D printed training model we developed for aneurysm clipping [1]. Read More

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Spinal Palpation Error and Its Impact on Skin Marker-Based Spinal Alignment Measurement in Adult Spinal Deformity.

Front Bioeng Biotechnol 2021 23;9:687323. Epub 2021 Jun 23.

Department of Development and Regeneration, Faculty of Medicine, Institute for Orthopaedic Research and Training, KU Leuven, Leuven, Belgium.

Spinal alignment measurement in spinal deformity research has recently shifted from using mainly two-dimensional static radiography toward skin marker-based motion capture approaches, allowing three-dimensional (3D) assessments during dynamic conditions. The validity and accuracy of such skin marker-based methods is highly depending on correct marker placement. In this study we quantified, for the first time, the 3D spinal palpation error in adult spinal deformity (ASD) and compared it to the error in healthy spines. Read More

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[Quantitative evaluation of printing accuracy of multi-color and multi-hardness three-dimensional printing dental model with photopolymer jetting].

Zhonghua Kou Qiang Yi Xue Za Zhi 2021 Jul;56(7):652-658

Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.

To quantitatively evaluate the accuracy of multi-color and multi-hardness dental models printed by using the photopolymer jetting (PJ) technology, and to provide protocol for the clinical application. A maxillary partially edentulous (Kennedy class Ⅱ subclass 1) standard digital model obtained through scanning and processing was selected as reference data. Five monochromatic DLP (digital light processing) models with single hardness were printed by printer DLP-800d based on DLP technology (DLP group), and five multi-color and multi-hardness PJ models were printed by printer J300Plus based on PJ technology (PJ group). Read More

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