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Antonio Oseas de Carvalho Filho, Aristófanes Corrêa Silva, Anselmo Cardoso de Paiva, Rodolfo Acatauassú Nunes, Marcelo Gattass
Using images from the Image Database Consortium and Image Database Resource Initiative (LIDC-IDRI), we developed a methodology for classifying lung nodules. The proposed methodology uses image processing and pattern recognition techniques. To classify volumes of interest into nodules and non-nodules, we used shape measurements only, analyzing their shape using shape diagrams, proportion measurements, and a cylinder-based analysis. In addition, we use the support vector machine classifier. To test the proposed methodology, it was applied to 833 images from the LIDC-IDRI database, and cross-validation with k-fold, where [Formula: see text], was used to validate the results...
October 17, 2016: Medical & Biological Engineering & Computing
Steven Kwasi Korang, Joshua Feinberg, Jørn Wetterslev, Janus C Jakobsen
BACKGROUND: Asthma is one of the most common reasons for hospital admission among children and constitutes a significant economic burden. Use of non-invasive positive pressure ventilation (NPPV) in the care of children with acute asthma has increased even though evidence supporting the intervention has been considered weak and clinical guidelines do not recommend the intervention. NPPV might be an effective intervention for acute asthma, but no systematic review has been conducted to assess the effects of NPPV as an add-on therapy to usual care in children with acute asthma...
September 30, 2016: Cochrane Database of Systematic Reviews
B Saleh
The potential use of many common hydrofluorocarbons and hydrocarbons as well as new hydrofluoroolefins, i.e. R1234yf and R1234ze(E) working fluids for a combined organic Rankine cycle and vapor compression refrigeration (ORC-VCR) system activated by low-grade thermal energy is evaluated. The basic ORC operates between 80 and 40 °C typical for low-grade thermal energy power plants while the basic VCR cycle operates between 5 and 40 °C. The system performance is characterized by the overall system coefficient of performance (COPS) and the total mass flow rate of the working fluid for each kW cooling capacity ([Formula: see text])...
September 2016: Journal of Advanced Research
K Mahesh, S Karpagam
We report on the synthesis and characterization of low band gap, blue light emitting and thermal stable conjugated oligomer by Wittig condensation. Thiophene and thiazole type of donor-acceptor based series of conjugated oligomers, Oligo-4,5-bis-[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OBTV-TZ) and Oligo-2,4,5-Tris-[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OTTV-TZ) were synthesized. These oligomers were confirmed by FT-IR and (1)H-NMR and LC/MS analysis. The effect of the number of thiophene rings on the optical, electrochemical, thermal and morphological properties of the oligomers were systematically investigated...
July 2016: Journal of Fluorescence
Keum-Shik Hong, Noman Naseer
In this paper, we present a systematic method to reduce the time lag in detecting initial dips using a vector-based phase diagram and an autoregressive moving average with exogenous signals (ARMAX) model-based q-step-ahead prediction algorithm. With functional near-infrared spectroscopy (fNIRS), signals related to mental arithmetic and right-hand clenching are acquired from the prefrontal and left primary motor cortices, respectively. The interrelationship between oxygenated hemoglobin, deoxygenated hemoglobin, total hemoglobin and cerebral oxygen exchange are related to initial dips...
May 2016: International Journal of Neural Systems
T Y Ou-Yang, G J Shu, J-Y Lin, C D Hu, F C Chou
Mn vacancy defect and grain size are shown to modify the magnetic phase diagram of MnSi significantly, especially near the critical regime of A-phase (skyrmion lattice) formation and the helimagnetic phase transition. Crystals grown using controlled nonstoichiometric initial precursors creates both grain boundaries and intrinsic Mn vacancy defect of various levels in MnSi. The results of combined transport, specific heat, and AC spin susceptibility measurements are compared for MnSi single crystal samples of various manganese deficiency levels and grain sizes...
January 20, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
G Yu, G Y Zhang, G H Ryu, C T Lin
We present results on the hydrothermal growth of ([Formula: see text])OHFeSe single crystals using floating-zone-grown [Formula: see text] (A  =  K, Rb, and Cs) as precursors. The growth proceeds by the hydrothermal ion exchange of Li/Fe-O-H for K, Rb, and Cs, resulting in a stacking layer of ([Formula: see text])OH sandwiched between the FeSe layers. Optimal growth parameters are achieved using high quality A 0.80Fe1.81Se2 single crystals added to the mixtures of LiOH, H2O, Fe and C(NH2)2Se in an autoclave and subsequently heated to 120 °C for 2 d, to obtain highest quality single crystals...
January 13, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
M J Nematollahi, P Ebrahimi, M Razmara, A Ghasemi
Hydrogeochemical investigations of groundwater in Torbat-Zaveh plain have been carried out to assess the water quality for drinking and irrigation purposes. In this study, 190 groundwater samples were collected and analyzed for physicochemical parameters and major ion concentrations. The abundance of major cations and anions was in the following order: Na(+) > Mg(2+) > Ca(2+) > K(+), and Cl(-) > [Formula: see text] > [Formula: see text] > [Formula: see text]. As a result, alkaline element (Na(+)) exceeds alkaline earth elements (Mg(2+) and Ca(2+)), and strong acids (Cl(-) and [Formula: see text]) dominate weak acids ([Formula: see text] and [Formula: see text]) in majority of the groundwater samples...
January 2016: Environmental Monitoring and Assessment
Peng Li, Wenxia Niu, Tao Gao
The structures, stabilities, nature of bonding, and spectroscopic properties of the new actinide imine molecules, neptunimine (HN=NpH2) and plutonimine (HN=PuH2), in the gas phase have been systematically explored at different levels of theory. Our calculation indicates that HN=AnH2 (An=Np, Pu) should be nonplanar and have a quartet ([Formula: see text]) and quintet ([Formula: see text]) ground state, respectively. The nature of the chemical bonding in these molecules were investigated by employing topological methods including electron localization function (ELF), atoms in molecules (AIM) as well as natural bond orbital analysis (NBO)...
December 2015: Journal of Molecular Modeling
C Echevarria-Bonet, D P Rojas, J I Espeso, J Rodríguez Fernández, M de la Fuente Rodríguez, L Fernández Barquín, L Rodríguez Fernández, P Gorria, J A Blanco, M L Fdez-Gubieda, E Bauer, F Damay
The structural state and static and dynamic magnetic properties of TbCu2 nanoparticles are reported to be produced by mechanical milling under inert atmosphere. The randomly dispersed nanoparticles as detected by TEM retain the bulk symmetry with an orthorhombic Imma lattice and Tb and Cu in the 4e and 8h positions, respectively. Rietveld refinements confirm that the milling produces a controlled reduction of particle sizes reaching ≃6 nm and an increase of the microstrain up to ≃0.6%. The electrical resistivity indicates a metallic behavior and the presence of a magnetic contribution to the electronic scattering which decreases with milling times...
December 16, 2015: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Bao Liu, Junguo Li, Yanan Zeng, Ziming Wang
AOD (Argon Oxygen Decarburization) slag is a by-product of the stainless steel refining process. The leaching toxicity of chromium from AOD slag cannot be ignored in the recycling process of the AOD slag. To assess the leaching toxicity of the AOD slag, batch leaching tests have been performed. PHREEQC simulations combined with FactSage were carried out based on the detailed mineralogical analysis and petrophysical data. Moreover, Pourbaix diagram of the Cr-H2O system was protracted by HSC 5.0 software to explore the chromium speciation in leachates...
February 2016: Chemosphere
Oksana Sologub, Leonid Salamakha, Peter Rogl, Berthold Stöger, Ernst Bauer, Johannes Bernardi, Gerald Giester, Monika Waas, Robert Svagera
On the basis of a detailed study applying X-ray single-crystal and powder diffraction, differential scanning calorimetry, and scanning electron microscopy analysis, it was possible to resolve existing uncertainties in the Pt-rich section (≥65 atom % Pt) of the binary Pt-B phase diagram above 600 °C. The formation of a unique structure has been observed for Pt2B [X-ray single-crystal data: space group C2/m, a = 1.62717(11) nm, b = 0.32788(2) nm, c = 0.44200(3) nm, β = 104.401(4)°, RF2 = 0.030]. Within the homogeneity range of "Pt3B", X-ray powder diffraction phase analysis prompted two structural modifications as a function of temperature...
November 16, 2015: Inorganic Chemistry
B Koteswararao, S K Panda, R Kumar, Kyongjun Yoo, A V Mahajan, I Dasgupta, B H Chen, Kee Hoon Kim, F C Chou
We investigate the magnetic, thermal, and dielectric properties of SrCuTe2O6, which is isostructural to PbCuTe2O6, a recently found, Cu-based 3D frustrated magnet with a corner-sharing triangular spin network having dominant first and second nearest neighbor (nn) couplings (Koteswararao et al 2014 Phys. Rev. B 90 035141). Although SrCuTe2O6 has a structurally similar spin network, the magnetic data exhibit the characteristic features of a typical quasi-1D magnet, which mainly resulted from the magnetically dominant third nn coupling, uniform chains...
October 28, 2015: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Yong-Jin Liu
The skeleton of a 2D shape is an important geometric structure in pattern analysis and computer vision. In this paper we study the skeleton of a 2D shape in a two-manifold M , based on a geodesic metric. We present a formal definition of the skeleton S(Ω) for a shape Ω in M and show several properties that make S(Ω) distinct from its Euclidean counterpart in R(2). We further prove that for a shape sequence {Ωi} that converge to a shape Ω in M, the mapping Ω→ S̅(Ω) is lower semi-continuous. A direct application of this result is that we can use a set P of sample points to approximate the boundary of a 2D shape Ω, and the Voronoi diagram of P inside Ω ⊂ M gives a good approximation to the skeleton S(Ω) ...
September 2015: IEEE Transactions on Pattern Analysis and Machine Intelligence
Iñigo Marcos-Alcalde, Javier Setoain, Jesús I Mendieta-Moreno, Jesús Mendieta, Paulino Gómez-Puertas
UNLABELLED: From conformational studies to atomistic descriptions of enzymatic reactions, potential and free energy landscapes can be used to describe biomolecular systems in detail. However, extracting the relevant data of complex 3D energy surfaces can sometimes be laborious. In this article, we present MEPSA (Minimum Energy Path Surface Analysis), a cross-platform user friendly tool for the analysis of energy landscapes from a transition state theory perspective. Some of its most relevant features are: identification of all the barriers and minima of the landscape at once, description of maxima edge profiles, detection of the lowest energy path connecting two minima and generation of transition state theory diagrams along these paths...
December 1, 2015: Bioinformatics
Nancy Fugate Woods, Rita Ismail, Lauri A Linder, Catherine Fiona Macpherson
OBJECTIVE: This study aims to elicit midlife women's heuristics about symptom clusters they were experiencing, as identified by the Computerized Symptom Capture Tool for Menopause (C-SCAT M). METHODS: Women aged 40 to 60 years who were experiencing symptoms that they associated with menopause were recruited through flyers posted on campus and in clinics. Women completed the C-SCAT M application (app), using an iPad, by identifying and drawing symptom clusters they experienced during the last 24 hours, indicating relationships among symptoms, prioritizing the clusters and symptoms within them, making causal attributions, and identifying exacerbating and ameliorating factors...
October 2015: Menopause: the Journal of the North American Menopause Society
Fabian Huettig, Detlef Axmann
AIM: To identify standards, how entities of dental status are assessed and reported from full-arch radiographs of adults. METHODS: A PubMed (Medline) search was performed in November 2011. Literature had to report at least one out of four defined entities using radiographs: number of teeth or implants; caries, fillings or restorations; root-canal fillings and apical health; alveolar bone level. Cohorts included to the study had to be of adult age. Methods of radiographic assessment were noted and checked for the later mode of report in text, tables or diagrams...
October 16, 2014: World Journal of Clinical Cases
Haomin Zhang
The present study tested a path diagram regarding the contribution of morphological awareness (MA) to early literacy acquisition among Chinese-speaking second graders ([Formula: see text]). Three facets of MA were addressed, namely derivational awareness, compound awareness and compound structure awareness. The model aimed to test a theory of causal order among measures of MA and literacy outcomes. Drawing upon multivariate path analysis, direct and indirect effects of MA were analyzed to identify their role in literacy performance among young children...
February 2016: Journal of Psycholinguistic Research
Angela María Alarcón, Lucy Barrera-Ortiz, Sonia Patricia Carreño, Gloria Mabel Carrillo, Ruth Elena Farías, Gladys González, Beatriz Sánchez-Herrera, Narda Santamaría
OBJECTIVE: To propose and validate a functional model that permits addressing, guiding, and qualifying nursing care in the Colombian National Cancer Institute. METHODOLOGY: Within the framework of the teaching-service work and as response to the priorities established by the National Cancer Institute, the need to have a model was determined to better understand the nursing work in the institution. For this purpose a study was conducted in three phases: 1) Analysis of the context, 2) Elaboration and analysis of the narratives of care, and 3) Development of the Functional Model of Nursing Care from the narratives...
2014: Investigación y Educación en Enfermería
Michael Nauenberg
In 1693, Gottfried Wilhelm Leibniz published in the Acta Eruditorum a geometrical proof of the fundamental theorem of the calculus. It is shown that this proof closely resembles Isaac Barrow's proof in Proposition 11, Lecture 10, of his Lectiones Geometricae, published in 1670. This comparison provides evidence that Leibniz gained substantial help from Barrow's book in formulating and presenting his geometrical formulation of this theorem. The analysis herein also supports the work of J. M. Child, who in 1920 studied the early manuscripts of Leibniz and concluded that he had frequently copied his diagrams from Barrow's book, but without acknowledgement...
July 2014: Annals of Science
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