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  • 1
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    Automatic Image Segmentation Using Active Contours with Univariate Marginal Distribution (2013)
    Hindawi
    Details
    Publication Date: 2013-11-26
    Description: This paper presents a novel automatic image segmentation method based on the theory of active contour models and estimation of distribution algorithms. The proposed method uses the univariate marginal distribution model to infer statistical dependencies between the control points on different active contours. These contours have been generated through an alignment process of reference shape priors, in order to increase the exploration and exploitation capabilities regarding different interactive segmentation techniques. This proposed method is applied in the segmentation of the hollow core in microscopic images of photonic crystal fibers and it is also used to segment the human heart and ventricular areas from datasets of computed tomography and magnetic resonance images, respectively. Moreover, to evaluate the performance of the medical image segmentations compared to regions outlined by experts, a set of similarity measures has been adopted. The experimental results suggest that the proposed image segmentation method outperforms the traditional active contour model and the interactive Tseng method in terms of segmentation accuracy and stability.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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    PAPER CURRENT
  • 2
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    Ocurrencia de un florecimiento fitoplanctónico en Cayo Largo, al sureste del golfo de Batabanó, Cuba (2013)
    Details
    Publication Date: 2021-05-19
    Description: Se informa sobre la ocurrencia por primera vez de un florecimiento o bloom de microalgas en Cayo Largo, Cuba; éste abarcó gran parte de las playas del litoral sur del cayo, identificándose como organismo productor de este bloom, una especie del género Phaeocystis Lagerheim.
    Description: Microalgae bloom is reported at South of Cayo Largo, Cuba. It changed color sea in the most important South littoral beaches of Cayo Largo, and the species identified belongs to Phaeocystis Lagerheim genus.
    Description: Published
    Description: red brown
    Description: microalgae
    Description: Cuba
    Keywords: Blooms ; Algae
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Heavy metals in sediments of a large, turbid tropical lake affected by anthropogenic discharges (2000)
    Springer
    Environmental geology 39 (2000), S. 378-383 
    Details
    ISSN: 1432-0495
    Keywords: Key words Anthropogenic ; Lake ; Metals ; Sediments ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Bottom-water data and trace metal concentration of Cu, Cr, Ni, Pb, Co, Zn, and organic matter in surficial sediment samples from 13 sampling stations of Lake Chapala in Mexico were studied. The lake is turbid with a great amount of flocculated sediments as a result of wind mixing, sediment re-suspension, and Lerma River discharges. Al distribution pattern in sediments was used as an indicator of the Lerma River discharges into Lake Chapala. The highest values of Cu (33.27 ppm), Cr (81.94 ppm), Pb (99.8 ppm), and Zn (149.7 ppm) were detected in sediments near the lake outlet. The bioavailable metal fraction is low for all metals except Pb, which shows 65–93% of the total metal concentration in bioavailable form. The minimum energy zone in the lake was related to organic matter concentration and was located in the SE part of the lake. An analysis of the studied parameters shows two zones: eastern zone (fluvio-deltaic) and central-western zone (lacustrine).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050017
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  • 4
    Electronic Resource
    Electronic Resource
    Biological upgrading of wheat straw through solid-state fermentation with Streptomyces cyaneus (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 764-771 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The biological upgrading of wheat straw with Streptomyces cyaneus was examined through the analysis of chemical and structural changes of the transformed substrate during solid-state fermentation. Analysis of enzymes produced during the growth of S. cyaneus showed that phenol oxidase was the predominant enzyme. The reduction in Klason lignin content (16.4%) in the transformed substrate indicated the ability of this strain to delignify lignocellulose residues and suggests a role for phenol oxidase in the bacterial delignification process. Microscopic examination of the transformed substrate showed that the initial attack occurred at the less lignified cell walls (phloem and parenchyma), while xylem and sclerenchyma were slowly degraded. The pattern of degradation of sclerenchymatic tissues by S. cyaneus showed delamination between primary and secondary walls and between S1 and S2 due to partial removal of lignin. In the later stages of the decay a disorganization of the secondary walls was detected on account of fibrillation of this layer. A comparison of the properties of the pulp from wheat straw transformed by S. cyaneus with untreated wheat straw showed that pretreatment improved the characteristics that determine the quality of pulp. This was indicated by an increase in pulp brightness and by a decrease in the kappa number. These changes occurred without significantly affecting the viscosity, a measure of the quality of the cellulose fibres. These results support the potential application of this organism or its oxidative enzymes in biopulping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000454
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  • 5
    Electronic Resource
    Electronic Resource
    Large Magnetoresistance at Oxide La〈sub〉0.7〈/sub〉Ca〈sub〉0.3〈/sub〉MnO〈sub〉3〈/sub〉 and YBa〈sub〉2〈/sub〉Cu〈sub〉3〈/sub〉O〈sub〉7〈/sub〉 Interfaces (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 2545-2553 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: We report magnetoresistance in ferromagnet / superconductor / ferromagnet structuresmade of La0.7Ca0.3MnO3 and YBa2Cu3O7 in the current in plane (CIP) geometry when thetemperature is fixed along the superconducting transition and the magnetic field is swept in anhysteresis loop sequence. We describe experiments changing the geometry of current versus field.We find that the shape and height of the magnetoresistance peaks is not modified no matter thefield is directed parallel or perpendicular to the current. This excludes interpretations in terms ofspontaneous vortices or anisotropic magnetoresistance of the ferromagnetic layers and supportsthe view that the magnetoresistance phenomenon originates at the spin dependent transport ofquasiparticles transmitted from the ferromagnetic electrodes into the superconductor
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.2545.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Particle Size and Size Distribution on the Mechanical Properties of EPDM/Silica Vulcanizates (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 113-116 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work we present the influence of different particle size (surface areas: 120,150, 200 and 250m2/g) and size distribution of precipitated silica on the mechanical properties of Ethylene-Propylene-Diene (EPDM) rubber. The vulcanization system employed was efficient. Compoundswere prepared using a Banbury internal mixer. Tensile and tear properties of vulcanized blendswere determined according to ASTM D412 and ASTM D624 procedures, respectively. Resultsshow an increasing tendency on tensile properties when particle size decreases, due to the betterdispersion of the filler and to a greater interaction with the rubber. Increases of up to 500% ontensile strength and 400% on tear strength were observed. However, there was an incoherentbehavior for the silica with surface area of 200 m2/g (Si-200), so size distribution of the aggregateswas experimentally determined by a microphotography study. Secondary aggregates sizedistribution was very different for each type of silica. Aggregates for Si-200 presented a bimodaldistribution where the greater frequencies correspond to aggregates with surface area higher thanthe corresponding values for the Si-120. This fact could explain why the mechanical properties ofthe EPDM filled with Si-200 are not in between the values of the compounds filled with Si-150 andSi-250
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.113.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fracture Behavior of Polypropylene /Elastomer Blends (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 278-281 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, effort has been undertaken to study the fracture behavior ofthermoplastic/elastomer (PP/SBS) dynamically vulcanized blends by analyzing the EWF testresults. PP/SBS blends were prepared with concentrations of SBS of 15, 30 and 40 wt%. Deeplydouble edged notched tension (DDENT) specimens were cut from injection molded plaques forfracture testing. It should be noted that the incorporation of SBS to PP seems to enhance fracturetoughness, thus the specific essential work (we) increases with elastomer content. The elastomerparticles contribute to the energy dissipation at the fracture surface and in the outer plastic zone inwhich various types of deformation might have been at work. Also, it seems that the fracturetoughness value levels-off from 30 wt% rubber on. In addition, the incorporation of SBS triggers aconsiderable plastic deformation, since the non-essential work ( βwp) increases compared to thevalue of pure PP. Nonetheless, a decrease in βwp is present with increasing amount of rubber. Sothe EWF method revealed that the dynamic vulcanization method can impair fracture resistance toPP/SBS blends
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.278.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Sintering of Mechanically Alloyed YSZ Nanocrystalline Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 1417-1420 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We report on the mechanical and structural properties of nanocrystalline 8% and 10%mol yttria stabilized zirconia (YSZ) obtained using mechanical alloying (MA). For milling timesabove 32 hours the complete alloying of the starting Y2O3 and ZrO2 powders is achieved. The asmilledpowders show a body-centered cubic crystalline structure with grain sizes in the order of 10nm. After uniaxial pressing and sintering the compacts exhibit densities of more than 93% of thetheoretical value. The microhardness of the compacts increases with sintering temperature,reaching a maximum value of 913 HV0.5 after sintering at 1220º C for 6 hours. The correlation ofthese enhanced mechanical properties with the microstructural changes induced by heat treatmentof the nanocrystalline MA powders is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1417.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Selective tunnelling effects in collinear chemical reactions (1985)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 5 (1985), S. 541-550 
    Details
    ISSN: 0392-6737
    Keywords: Specific chemical reactions ; reaction mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si esamina il contributo dell'effetto tunnel alla probabilità reattiva per reazioni con barriera anticipata e con barriera posticipata. Per la prima classe di reazioni si discute un nuovo tipo di effetto tunnel che ha luogo ad alte energie traslazionali. Per ambedue i tipi di reazione si discute il nesso esistente tra le caratteristiche dell'effetto tunnel e la forma di energia che è capace di favorire la reazione in relazione alla posizione della barriera.
    Notes: Summary Tunnelling contributions to the reactive probability of both early- and late-barrier reactions are investigated. For the first class of reactions a new type of tunnelling effect taking place at high translational energy is discussed. For both reactions relations linking tunnelling features to the type of energy promoting reactivity are discussed with regard to the barrier location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452550
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  • 10
    Electronic Resource
    Electronic Resource
    Observation of propagating collective excitations in liquid SO2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5387-5391 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectrum of collective excitations in liquid sulphur dioxide at two thermodynamic states has been measured by neutron triple-axis spectroscopy for momentum transfer ranges of 0.35≤Q≤2.0 A(ring)−1. Well-resolved inelastic peaks indicating the presence of propagating modes are found for Q values below 0.5 A(ring)−1 at T=266 K and below 0.7 A(ring)−1 at T=210 K. A precise value for the hydrodynamic limit has been found in both cases and the measured "dispersion relations'' are discussed in relation to predictions made by recent theoretical approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461654
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