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Results 251 - 300 of 3125
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Vannoni Maurizio - - 2014
A method to provide absolute planarity measurements through an interferometric oblique incidence setup and an iterative algorithm is presented. With only three measurements, the calibration of absolute planarity is achieved in a fast and effective manner. Demonstration with synthetic data is provided, and the possible application to very long flat ...
Mulder Emma R ER Image Analysis Center, VU University Medical Center, Amsterdam, The Netherlands; Department of Radiology, VU University Medical Center, Amsterdam, The - - 2014
To measure hippocampal volume change in Alzheimer's disease (AD) or mild cognitive impairment (MCI), expert manual delineation is often used because of its supposed accuracy. It has been suggested that expert outlining yields poorer reproducibility as compared to automated methods, but this has not been investigated. To determine the reproducibilities ...
Cros David D Genetic Improvement and Adaptation of Mediterranean and Tropical Plants Research Unit (AGAP), CIRAD, International campus of Baillarguet, TA A-108/C, 34398, Montpellier Cedex 5, France, - - 2014
Explicit pedigree reconstruction by simulated annealing gave reliable estimates of genealogical coancestry in plant species, especially when selfing rate was lower than 0.6, using a realistic number of markers. Genealogical coancestry information is crucial in plant breeding to estimate genetic parameters and breeding values. The approach of Fernández and Toro ...
Langlois Eric E Centre de Toxicologie du Québec (CTQ), Institut National de Santé Publique du Québec (INSPQ), 945 Ave Wolfe, Québec, Québec G1V 5B3, Canada. Electronic address: - - 2014
Phthalate metabolites are often measured in biomonitoring studies to evaluate a population's exposure to ubiquitous phthalates. During the course of national biomonitoring studies in Canada, we identified an issue with the accuracy of several commercial phthalate metabolite standards that are commonly used in such studies. The validity of the results ...
Munger Crystal C Virginia Commonwealth University, 821 W. Franklin Street Richmond, VA, - - 2014
Refractive indices of seven double-paned vehicle windshields were measured to assess the variation across the pane of glass and to evaluate collection techniques for known glass standards by comparing false negative rates. Measurements were made using a Foster and Freeman GRIM3 instrument, and a minimum of 240 measurements were made ...
Sancho-Bru Joaquin L JL Biomechanics and Ergonomics Group, Department of Mechanical Engineering and Construction, Universitat Jaume I, Castello'n de la Plana, - - 2014
Hand movement measurement is important in clinical, ergonomics and biomechanical fields. Videogrammetric techniques allow the measurement of hand movement without interfering with the natural hand behaviour. However, an accurate measurement of the hand movement requires the use of a high number of markers, which limits its applicability for the clinical ...
Westgate Philip M PM Department of Biostatistics, College of Public Health, University of Kentucky, Lexington, KY 40536, - - 2014
Generalized estimating equations are commonly used to analyze correlated data. Choosing an appropriate working correlation structure for the data is important, as the efficiency of generalized estimating equations depends on how closely this structure approximates the true structure. Therefore, most studies have proposed multiple criteria to select the working correlation ...
Sá Rui Carlos RC 1University of California, San - - 2014
Specific Ventilation Imaging (SVI) uses proton MRI to quantitatively map the distribution of specific ventilation (SV) in the human lung, using inhaled oxygen as a contrast agent. To validate this recent technique, we compared the quantitative measures of heterogeneity of the SV distribution in a 15mm sagittal slice of lung ...
Fonda Borut B a School of Sport, Exercise and Rehabilitation Sciences , University of Birmingham , Birmingham , - - 2014
Abstract The most common bike fitting method to set the seat height is based on the knee angle when the pedal is in its lowest position, i.e. bottom dead centre (BDC). However, there is no consensus on what method should be used to measure the knee angle. Therefore, the first ...
Dryzun Chaim C Department of Natural Sciences, The Open University of Israel, Raanana, 43107, - - 2014
Symmetry is a fundamental property of nature, used extensively in physics, chemistry, and biology. The Continuous symmetry measures (CSM) is a method for estimating the deviation of a given system from having a certain perfect symmetry, which enables us to formulate quantitative relation between symmetry and other physical properties. Analytical ...
Ferl Gregory Z GZ Department of Pharmacokinetics & Pharmacodynamics, Genentech, Inc., South San Francisco, California, - - 2014
Most dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) data are evaluated for individual patients with cohorts analyzed to detect significant changes from baseline values, repeating the process at each posttreatment timepoint. Our study aimed to develop a statistically valid model for the complete time course of DCE-MRI data in a patient ...
Keogh Ruth H RH Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, - - 2014
Exposure measurement error is a problem in many epidemiological studies, including those using biomarkers and measures of dietary intake. Measurement error typically results in biased estimates of exposure-disease associations, the severity and nature of the bias depending on the form of the error. To correct for the effects of measurement ...
Milanzi Elasma E Interuniversity Institute for Biostatistics and statistical Bioinformatics, Universiteit Hasselt, Diepenbeek, - - 2014
For item response theory (IRT) models, which belong to the class of generalized linear or non-linear mixed models, reliability at the scale of observed scores (i.e., manifest correlation) is more difficult to calculate than latent correlation based reliability, but usually of greater scientific interest. This is not least because it ...
Ferrer Rodrigo - - 2014
In applied research as well as in clinical practice, it is common to evaluate the change that patients experience as a consequence of the treatment they receive. Various methods designed to evaluate this change are reviewed in this study. This review has focused on a specific aspect that has not ...
Law Charity W - - 2014
Normal linear modeling methods are developed for analyzing read counts from RNA-seq experiments. The voom method estimates the mean-variance relationship of the log-counts, generates a precision weight for each observation, and then enters these into a limma empirical Bayes analysis pipeline. This opens access for RNA-seq analysts to a large ...
Parker Michael J - - 2014
The ability to accurately obtain and interpret spirometry is essential for physicians caring for patients with asthma and inflammatory disease of the airway. This article reviews the basic equipment, setting, and personnel needed to obtain quality spirometric data. The fundamental measurements obtained in routine office spirometry and recommendations that are ...
Le Sang N SN National University of Singapore, - - 2014
Origamic architecture (OA) is a form of papercraft that involves cutting and folding a single sheet of paper to produce a 3D pop-up, and is commonly used to depict architectural structures. Because of the strict geometric and physical constraints, OA design requires considerable skill and effort. In this paper, we ...
Mattos Claudia Trindade CT Professor, Department of Dental Clinics, Universidade Federal Fluminense, Niterói, Brazil. Electronic address: - - 2014
Our objective was to assess the intraexaminer and interexaminer reliabilities of upper airway linear, area, and volumetric measurements in cone-beam computed tomography. Cone-beam computed tomography scans of 12 subjects were randomly selected from a pool of 132 orthodontic patients. An undergraduate student, an orthodontist, and a dental radiologist independently made ...
Vadeby Anna A a The Swedish National Road and Transport Research Institute , SE-581 95 , Linköping , - - 2014
Abstract Objective: The study sought to estimate changes in actual driving speed occurring after new speed limits were introduced in Sweden's rural road network. Method: The effects of speed limit changes were estimated for seven groups of roads of different types and initial speed limits. To study the effects on ...
Bozkurt Hayriye H Department of Food Science and Technology, University of Tennessee-Knoxville, 2605 River Drive, Knoxville, Tennessee 37996-4591, - - 2014
Leafy greens, including spinach, have potential for human norovirus transmission through improper handling and/or contact with contaminated water. Inactivation of norovirus prior to consumption is essential to protect public health. Because of the inability to propagate human noroviruses in vitro, murine norovirus (MNV-1) and feline calicivirus (FCV-F9) have been used ...
Staring M M Department of Radiology, Division of Image Processing, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The - - 2014
Whole lung densitometry on chest CT images is an accepted method for measuring tissue destruction in patients with pulmonary emphysema in clinical trials. Progression measurement is required for evaluation of change in health condition and the effect of drug treatment. Information about the location of emphysema progression within the lung ...
Norsang Gelsor - - 2014
We compare results for the UV index (UVI), the total ozone column (TOC), and the radiation modification factor (RMF, being 1 in the absence of clouds and aerosols) at four sites on the Tibetan Plateau. The results were obtained by analyzing ground measurements by multichannel moderate-bandwidth filter instruments for the ...
Kim Won Kuel WK Department of Physical Medicine and Rehabilitation, Chung-Ang University College of Medicine, Seoul, - - 2014
To determine the reliability and validity of hand-held dynamometer (HHD) depending on its fixation in measuring isometric knee extensor strength by comparing the results with an isokinetic dynamometer. Twenty-seven healthy female volunteers participated in this study. The subjects were tested in seated and supine position using three measurement methods: isometric ...
Grünheid Thorsten T Assistant professor, Division of Orthodontics, School of Dentistry, University of Minnesota, Minneapolis, Minn. Electronic address: - - 2014
Historically, orthodontists have taken dental measurements on plaster models. Technological advances now allow orthodontists to take these measurements on digital models. In this study, we aimed to assess the accuracy, reproducibility, and time efficiency of dental measurements taken on 3 types of digital models. emodels (GeoDigm, Falcon Heights, Minn), SureSmile ...
Huang Wei W Oregon Health and Science University, Portland, - - 2014
Pharmacokinetic analysis of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) time-course data allows estimation of quantitative parameters such as K (trans) (rate constant for plasma/interstitium contrast agent transfer), v e (extravascular extracellular volume fraction), and v p (plasma volume fraction). A plethora of factors in DCE-MRI data acquisition and analysis can ...
Kennes Lieven L University Hospital Aachen, Institute of Medical - - 2014
The purpose of this study was to create a new reference line for perineal ultrasound. We compared a new line to the horizontal reference line by Dietz (Line 1) and the central pubic line by Schaer (Line 2) as regards rates of possible assessment and the outcome of a reliability ...
Clerc Frédéric F 1. INRS - French National Institute for Health and Safety, 1 rue du Morvan, Vandoeuvre les Nancy 54500, - - 2014
This study was aimed at quantifying the impact of sampling duration and the number of measurements taken on the quality of assessing occupational exposure to toluene. To this end, a measurement database was built, based on four campaigns carried out in an industrial printing facility. Five homogeneous exposure groups (HEGs) ...
Hutchison Joanna L JL School of Behavioral and Brain Sciences, University of Texas at Dallas, Richardson, TX; Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX. Electronic address: - - 2014
Using a standard space brain template is an efficient way of determining region-of-interest (ROI) boundaries for functional magnetic resonance imaging (fMRI) data analyses. However, ROIs based on landmarks on subject-specific (i.e., native space) brain surfaces are anatomically accurate and probably best reflect the regional blood oxygen level dependent (BOLD) response ...
Beyer Benoît B Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium. Electronic address: - - 2014
The costovertebral joint complex is mechanically involved in both respiratory function and thoracic spine stability. The thorax has been studied for a long time to understand its involvement in the physiological mechanism leading to specific gas exchange. Few studies have focused on costovertebral joint complex kinematics, and most of them ...
An Bingbing B Department of Mechanics, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China; Department of Physics, Shanghai University, Shanghai 200444, PR - - 2014
Biological materials exhibiting non-self-similar hierarchical structures possess desirable mechanical properties. Motivated by their penetration resistance and fracture toughness, the mechanical performance of model materials with non-self-similar hierarchical structures was explored and the distinct advantages were identified. A numerical model was developed, based on microscopic observation of enamel prisms. Computational simulations ...
Louis Bruno B Department of Pharmacy, Sultan Qaboos University Hospital, Al Khod, Muscat, 123, - - 2014
In the present study the volume of distribution values in humans of 121 drugs was estimated using quantitative structure pharmacokinetic relationship analysis. The multiple linear regression (MLR) method and nonlinear artificial neural network (ANN) and support vector machines (SVM) were employed for modeling. The theoretically calculated molecular descriptors were used ...
Cozzolino M M Department of Radiation Oncology, IRCCS CROB, 1 Padre Pio Street, 85028 Rionero in Vulture, PZ, Italy. Electronic address: - - 2014
The aim of this paper is to evaluate clinically relevant quality assurance (QA) tests for RapidArc prostate patients. 26 plans were verified by the COMPASS system that provides an independent angle response and a reconstruction of dose distribution in patient CT model. Plan data were imported from treatment planning system ...
Mirauta Bogdan B Génomique des Microorganismes, UPMC and CNRS UMR7238, Paris, France. Mathématique Informatique et Génome, INRA UR1077, Jouy-en-Josas, - - 2014
The most common RNA-Seq strategy consists of random shearing, amplification, and high-throughput sequencing, of the RNA fraction. Methods to analyze transcription level variations along the genome from the read count profiles generated by the RNA-Seq protocol are needed. We developed a statistical approach to estimate the local transcription levels and ...
Lee Seung-Jae SJ National Center for Agro-Meteorology, Seoul National University, Building #36 (Room 109), 1 Gwanak-ro, Gwanak-gu, Seoul, 151-744, South Korea, - - 2014
This study describes an effort to estimate atmospheric mixing height using vertical profiles of thermodynamic variables measured operationally at radiosonde sites in South Korea. We focus on mixing height at 06UTC (15LST) when vigorous daytime convection is expected with clear skies. For this purpose, we developed a simple numerical algorithm ...
Schulz Jörn - - 2014
Delineation of the target volume is a time-consuming task in radiotherapy treatment planning, yetessential for a successful treatment of cancers such as prostate cancer. To facilitate the delineationprocedure, the paper proposes an intuitive approach for 3D modeling of the prostate by slice-wisebest fitting ellipses.The proposed estimate is initialized by the ...
Ghosh Pranay P IBG-1: Biotechnology, Forschungszentrum Jülich, - - 2014
A model-based approach is presented for quantitatively decoupling the impacts of non-ideal flow and non-ideal binding in membrane chromatography (MC) capsules at different scales. The internal geometry of Sartobind® capsules with 0.08ml and 1200ml membrane volume is reconstructed from MRI measurements and manufacturer data. Based on this information, computational fluid ...
Belous K K Institute for High Energy Physics, Protvino - - 2014
The lifetime of the τ lepton is measured using the process e^{+}e^{-}→τ^{+}τ^{-}, where both τ leptons decay to 3πν_{τ}. The result for the mean lifetime, based on 711  fb^{-1} of data collected with the Belle detector at the ϒ(4S) resonance and 60  MeV below, is τ=(290.17±0.53(stat)±0.33(syst))×10^{-15}  s. The first measurement of the lifetime ...
Chee Grace G Dept. of Molecular Biosciences and Bioengineering, Univ. of Hawaii, Honolulu, Hawaii 96822, - - 2014
The dielectric (DE) properties, specifically the DE constant (ε') and loss factor (ε''), were measured for vacuum-dried and freeze-dried potato samples at a microwave frequency of 2.45 GHz over a range of different moisture contents (MCs) using a DE probe and also a 2-probe electrochemical impedance spectroscopy (EIS). Third-order polynomial ...
Fedorov Andriy A Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115. Electronic address: - - 2014
Multi-parametric Magnetic Resonance Imaging, and specifically Dynamic Contrast Enhanced (DCE) MRI, play increasingly important roles in detection and staging of prostate cancer (PCa). One of the actively investigated approaches to DCE MRI analysis involves pharmacokinetic (PK) modeling to extract quantitative parameters that may be related to microvascular properties of the ...
Nunes Nélson N Área Departamental de Engenharia Química, Instituto Superior de Engenharia de Lisboa (ISEL), Instituto Politécnico de Lisboa, R. Conselheiro Emídio Navarro, 1, 1959-007 Lisboa, Portugal; Centro de Química e Bioquímica (CQB), Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016 Lisboa, - - 2014
Solvatochromic UV-Vis shifts of four indicators (4-nitroaniline, 4-nitroanisole, 4-nitrophenol and N,N-dimethyl-4-nitroaniline) have been measured at 298.15K in the ternary mixture methanol/1-propanol/acetonitrile (MeOH/1-PrOH/MeCN) in a total of 22mole fractions, along with 18 additional mole fractions for each of the corresponding binary mixtures, MeOH/1-PrOH, 1-PrOH/MeCN and MeOH/MeCN. These values, combined with our ...
Barros S S Instituto Superior Técnico, CTN, Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2695-066, - - 2014
This work compares the results of four different unfolding codes, MSANDB, MAXED, FRUIT and BONMA, which are based on different unfolding techniques. Additionally, Bayesian parameter estimation is also considered. All unfolding codes were supplied with the same set of input data acquired at the Environmental Research Station 'Schneefernerhaus' on the ...
Bell Melanie L ML Psycho-Oncology Co-Operative Research Group, School of Psychology, University of Sydney, Australia; Mel and Enid Zuckerman College of Public Health, University of Arizona, 295 N Martin Ave, Tucson, AZ 85724, - - 2014
Several methods exist to calculate sample size for the difference of proportions (risk difference). Researchers are often unaware that there are different formulae, different underlying assumptions, and what the impact of choice of formula is on the calculated sample size. The aim of this study was to discuss and compare ...
Korakakis Vasileios V Faculty of Physical Education and Sport Sciences, University of Thessaly, Karyes 42100 Trikala, Greece; CE.RE.TE.TH, Trikala, Greece. Electronic address: - - 2014
Sitting posture predominates in lifestyle and workplace, but quantitative postural designation is limited due to divergence of methodology used in the studies. To date, no study has investigated the upper body's habitual or a predetermined sitting posture in healthy individuals assessing together pelvis, spine and head. The objectives were (i) ...
Swaminathan Hariharan H University of Connecticut, Department of Educational Psychology, U-3064, Storrs, CT 06269, USA. Electronic address: - - 2014
This article describes a linear modeling approach for the analysis of single-case designs (SCDs). Effect size measures in SCDs have been defined and studied for the situation where there is a level change without a time trend. However, when there are level and trend changes, effect size measures are either ...
Westgate Philip M PM Department of Biostatistics, College of Public Health, University of Kentucky, Lexington, KY 40536, - - 2014
Generalized estimating equations (GEE) are commonly used for the marginal analysis of correlated data, although the quadratic inference function (QIF) approach is an alternative that is increasing in popularity. This method optimally combines distinct sets of unbiased estimating equations that are based upon a working correlation structure, therefore asymptotically increasing ...
Ando Ryosuke R Graduate School of Education and Human Development, Nagoya University, Japan. Electronic address: - - 2014
The purpose of this study was to determine the validity of fascicle length estimation in the vastus lateralis (VL) and vastus intermedius (VI) using ultrasonography. The fascicle lengths of the VL and VI muscles were measured directly (dFL) using calipers, and were estimated (estmFL) using ultrasonography, in 10 legs from ...
Lindner C C Centre for Imaging Sciences, The University of Manchester, Manchester M13 9PT, UK. Electronic address: - - 2014
In total hip arthroplasty, the shape of the contra-lateral femur frequently serves as a template for preoperative planning. Previous research on contra-lateral femoral symmetry has been based on conventional hip geometric measurements (which reduce shape to a series of linear measurements) and did not take the effect of subject positioning ...
Wan Jian J Control Systems Center, School of Electrical and Electronic Engineering, The University of Manchester, Manchester, UK. Electronic address: - - 2014
Batch processes are commonly characterized by uneven trajectories due to the existence of batch-to-batch variations. The batch end-product quality is usually measured at the end of these uneven trajectories. It is necessary to align the time differences for both the measured trajectories and the batch end-product quality in order to ...
Wand Handan H The Kirby Institute, University of New South Wales, Sydney, - - 2014
Graphical representation of data is one of the most easily comprehended forms of explanation. The current study describes a simple visualization tool which may allow greater understanding of medical and epidemiological data. We propose a simple tool for visualization of data, known as a "quilt plot", that provides an alternative ...
Perdikaris Paris P Division of Applied Mathematics, Brown University, Providence, RI, USA, - - 2014
In this work we employ integer- and fractional-order viscoelastic models in a one-dimensional blood flow solver, and study their behavior by presenting an in-silico study on a large patient-specific cranial network. The use of fractional-order models is motivated by recent experimental studies indicating that such models provide a new flexible ...
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