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Wyszukujesz frazę "Perez, A." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Hexagonal Photonic Crystal Fiber Behaviour as a Chromatic Dispersion Compensator of a 40 Gbps Link
    Autorzy:
    Betancur-Pérez, A. F.
    Botero-Cadavid, J. F.
    Reyes-Vera, E.
    Gómez-Cardona, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/226794.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BER
    chromatic dispersion
    DWDM
    photonic crystal fibers
    vector finite element method
    Opis:
    In this paper, the capabilities of chromatic dispersion compensation of a photonic crystal fiber with a hexagonal distribution of circular air holes was investigated. The vector finite element method with scattering boundary condition was used to analyze a set of configurations of the fiber in which the distance between air holes’ centers was modified. With this method it was possible to obtain the values of chromatic dispersion and confinement factor in the C fiber band. The best suited configurations were tested in a 160 km optical link with a bit rate of 40 Gbps. The performance was evaluated by measuring the bit error rate for a set of 20 channels with channel spacing of 100 GHz. T e simulation results showed that is possible to reach values of hromatic dispersion as low as −850 ps/nm⋅km, confinement losses close to 10⁻³ dB/km and good BER results in the order of 10⁻¹⁷ for a wavelength of 1550 nm.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 93-98
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Scattering of 3D Complex Systems Having Random Rough Surfaces by Scalar Integral Equations
    Autorzy:
    Guel-Tapia, J. A.
    Villa-Villa, F.
    Mendoza-Suárez, A.
    Pérez-Aguilar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/178120.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    integral equations
    Helmholtz equation
    acoustic scattering
    Opis:
    We propose a numerical surface integral method to study complex acoustic systems, for interior and exterior problems. The method is based on a parametric representation in terms of the arc’s lengths in curvilinear orthogonal coordinates. With this method, any geometry that involves quadric or higher order surfaces, irregular objects or even randomly rough surfaces can be considered. In order to validate the method, the modes in cubic, spherical and cylindrical cavities are calculated and compared to analytical results, which produced very good agreement. In addition, as examples, we calculated the scattering in the far field and the near field by an acoustic sphere and a cylindrical structure with a rough cross-section.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 461-472
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Analysis of the Graphite Flake Formation of Low Manganese and Sulfur Gray Cast Iron
    Autorzy:
    Reyes-Castellanos, G.
    Cruz-Ramírez, A.
    Colin-García, E.
    Gutiérrez-Pérez, V. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049436.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gray iron
    inoculation
    cell count
    thermodynamic analysis
    Opis:
    Low manganese and sulfur gray irons were produced by adding inoculant base Fe-Si with small amounts of Al and Ca in the ladle. The effect of the cast thickness, inoculant amount and shakeout time of the green sand molds were studied on the graphite flake formation by microscopically techniques. A thermodynamic analysis was carried out for the cast iron produced with the FactSage 7.2 software. Stability phase diagrams were obtained for both gray cast irons to different manganese (0.1 to 0.9 wt.%) and sulfur (0.01 to 0.12 wt.%) amounts to 1150°C. It was shown that lower amounts of manganese and sulfur allow forming the 3Al2O3·2SiO2, Al2O3, and ZrO2 solid compounds. The thermodynamic results match with those obtained by SEM-EDS. It is possible to form MnS particles in the liquid phase when the solubility product (%Mn) × (%S) equals 0.042 and 0.039 for heats A and B, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 249-258
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A time-domain pulse amplitude and width discrimination method for photon counting
    Autorzy:
    del Mar Correa, M.
    Pérez, F. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/220971.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    field-programmable gate array
    time-to-digital converter
    spectroscopy
    photomultiplier
    photon counting
    discriminator
    after-pulsing
    low-voltage differential signalling
    Opis:
    This work shows a time-domain method for the discrimination and digitization of parameters of voltage pulses coming from optical detectors, taking into account the presence of electronic noise and afterpulsing. Our scheme is based on an FPGA-based time-to-digital converter as well as an adjustable-threshold comparator complemented with commercial elements. Here, the design, implementation and optimization of a multiphase TDC using delay lines shorter than a single clock period is also described. The performance of this signal processing system is discussed through the results from the statistical code density test, statistical distributions of measurements and information gathered from an optical detector. Unlike dual voltage threshold discriminators or constant-fraction discriminators, the proposed method uses amplitude and time information to define an adjustable discrimination window that enables the acquisition of spectra.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 2; 269-282
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold
    Autorzy:
    Gonzalez-Trejo, J.
    Real-Ramirez, C. A.
    Miranda-Tello, R.
    Rivera-Perez, F.
    Cervantes-de-la-Torre, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/351515.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    submerged entry nozzle
    fluid-flow modifiers
    continuous casting of steel
    mold flow patterns
    turbulence
    Opis:
    Some of the most recent technologies that improves the performance in continuous casting process has installed infrastructure outside the mold to modify the natural fluid flow pattern to obtain a quasi-steady condition and promote a uniform solidified shell of steel. The submerged entry nozzle distributes the liquid steel in the mold and can be used to obtain the flow symmetry condition with external geometry improvements. The fluid flow conditioners were located near the outlet ports of the nozzle. The aim of the modifiers is to impose a pseudo symmetric pattern in the upper zone of the mold by inhibiting the fluid exchange between the zones created by conditioners. This work evaluates the effect of the thickness and length of the fluid-flow modifiers on the overall performance of the submerged nozzle. These properties of the fluid-flow modifiers were normalized based on two of the geometric dimensions of the standard equipment. Numerical and physical simulations suggest that the flow modifier should be as thin as possible.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 927-946
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of a flow cytometry-based assay for monitoring complement-dependent cytotoxicity of an anti-CD20 biosimilar candidate antibody
    Autorzy:
    Blanco-Santana, R.
    Cedeno-Arias, M.
    Garcia-Perez, Z.
    Columbie-Gilbert, D.
    Portillo-Vaquer, A.
    Rengifo-Calzado, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/80888.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flow cytometry
    validation
    complement-dependent cytotoxicity
    monoclonal antibody
    CD20 antigen
    biological activity
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2014, 95, 1
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Welding Effects on the Mechanical Integrity of a Trip800 Steel: a Comparison of Laser Co2 and Gmaw Processes
    Wpływ spawania na integralność mechanicznaą stali Trip800: porównanie spawania laserowego ze spawaniem elektrodą topliwą
    Autorzy:
    Perez-Medina, G. Y.
    Lopez, H. F.
    Reyes-Valdes, F. A.
    Garza-Gomez, A.
    Lopez-Ochoa, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351511.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser
    GMAW
    retained austenite
    color metallography
    spawanie elektrodą topliwą
    austenit resztkowy
    metalografia barwna
    Opis:
    In this work a strip of a transformation induced plasticity (TRIP) steel was welded using gas metal arc welding (GMAW) and Laser CO2 welding (LBW) processes and the resultant strength and ductility of the welded joints evaluated. It was found that LBW lead to relatively high hardness in the fusion zone, FZ where the resultant microstructure was predominantly martensite. The relative volume fractions of phases developed in the welded regions were quantitatively measured using color metallography combined with X-ray diffraction analyses. It was found that the heat affected zone, HAZ developed the maximum amount of martensite (up to 32%) in the steel welded using LBW besides a mixture of bainite, retained austenite and ferrite phases. In contrast, a relatively low percent of martensite (10.8%) was found in the HAZ when the GMAW process was implemented.
    Pas ze stali typu TRIP poddano spawaniu elektrodą topliwą oraz spawaniu laserowemu i oceniono wytrzymałość i plastyczność uzyskanych połączeń spawanych. Stwierdzono, że spawanie laserowe prowadzi do uzyskania stosunkowo wysokiej twardości w strefie łączenia, gdzie powstała mikrostrukturę stanowi głównie martenzyt. Względne udziały objętościowe faz w spawanych obszarach zmierzono ilościowo za pomocą barwnej metalografii w połączeniu z dyfrakcyjną analizą rentgenowską. Stwierdzono, że w przypadku stali spawanej laserowo strefa wpływu ciepła zawiera najwięcej martenzytu (do 32%), a oprócz tego mieszanine bainitu, resztkowego austenitu i ferrytu. Natomiast w strefie wpływu ciepła uzyskanej podczas spawania elektrodą topliwą stwierdzono stosunkowo niską zawartość martenzytu (10,8%).
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 4; 1427-1432
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vascular structure of the earliest shark teeth
    Autorzy:
    Martínez-Pérez, C.
    Martín-Lazaro, A.
    Ferrón, H. G.
    Kirstein, M.
    Donoghue, P. C. J.
    Botella, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/139170.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Leonodus
    Celtiberina
    early chondrichthyans
    Lower Devonian
    synchrotron tomography
    vascular system
    ryby chrzęstnoszkieletowe
    ryby chrzęstne
    chrzęstniki
    dolny dewon
    tomografia
    układ naczyniowy
    Opis:
    Here we use synchrotron tomography to characterise dental vasculature in the oldest known tooth-bearing sharks, Leonodus carlsi Mader, 1986 and Celtiberina maderi Wang, 1993. Three dimensional reconstruction of the vascular system and microstructure of both taxa revealed a complex and dense network of canals, including horizontal, ascending and secondary bifurcated canals, as well as histological features consistent with an osteodont histotype. However, L. carlsi and C. maderi also exhibit significant morphological differences, showing Leonodus a typical diplodont tooth morphology with a linguo-labially elongated base, that contrast with Celtiberina’s teeth that show a single conical cusp curved lingually with a week developed flat base mesio-distally extended, perhaps reflecting distant relationship. These data are compatible with a pre-Devonian diversification of the two main tooth types traditionally recognised in Palaeozoic sharks (i.e., “cladodont” vs “diplodont”). Finally, our data demonstrate that existing dental classification schemes based on styles of vascularisation are over-simplified, especially when Palaeozoic taxa are considered.
    Źródło:
    Acta Geologica Polonica; 2018, 68, 3; 457-465
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual regulation of cytosolic ascorbate peroxide (APX) by tyrosine nitration and S-nitrosylation
    Autorzy:
    Begara-Morales, J.
    Sanchez-Calvo, B.
    Chaki, M.
    Valderrama, R.
    Mata-Perez, C.
    Lopez-Jaramillo, J.
    Carreras, A.
    Padilla, M.
    Corpas, F.
    Barroso, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/80378.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    post-translational modification
    nitric oxide
    target protein
    ascorbate peroxidase
    tyrosine nitration
    S-nitrosylation
    salinity stress
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design, Manufacture and Characterization of an Acoustic Barrier Made of Multi-Phenomena Cylindrical Scatterers Arranged in a Fractal-Based Geometry
    Autorzy:
    Casteneira-Ibanez, S.
    Rubio, C.
    Romero-Garcia, V.
    Sanchez-Perez, J. V.
    Garcia-Raffi, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176662.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic arrays
    acoustic attenuation
    acoustic wave absorption
    acoustic wave scattering
    phononic crystals
    acoustic barrier
    physical effect of sound
    Opis:
    In this work we present the design and the manufacturing processes, as well as the acoustics standard- ization tests, of an acoustic barrier formed by a set of multi-phenomena cylindrical scatterers. Periodic arrangements of acoustic scatterers embedded in a fluid medium with different physical properties are usually called Sonic Crystals. The multiple scattering of waves inside these structures leads to attenuation bands related to the periodicity of the structure by means of Bragg scattering. In order to design the acoustic barrier, two strategies have been used: First, the arrangement of scatterers is based on fractal geometries to maximize the Bragg scattering; second, multi-phenomena scatterers with several noise con- trol mechanisms, as resonances or absorption, are designed and used to construct the periodic array. The acoustic barrier reported in this work provides a high technological solution in the field of noise control.
    Źródło:
    Archives of Acoustics; 2012, 37, 4; 455-462
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differential transcriptomic analysis by RNA-seq of GSNO-responsive genes between Arabidopsis roots and leaves
    Autorzy:
    Begara-Morales, J.
    Sanchez-Calvo, B.
    Luque, F.
    Laterrier, M.
    Valderrama, R.
    Mata-Perez, C.
    Padilla, M.
    Carreras, A.
    Corpas, F.
    Barroso, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/81065.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    transcriptome
    RNA sequence
    S-nitrosoglutathione
    nitric oxide
    stress condition
    physiological condition
    gene expression
    root
    leaf
    Arabidopsis
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxidative stress responses are regulated by heat shock factor HSFA4A in Arabidopsis
    Autorzy:
    Perez Salamo, I.
    Papdi, C.
    Rigo, G.
    Zsigmond, L.
    Vilela, B.
    Pages, M.
    Nagy, I.
    Domoki, M.
    Darula, Z.
    Koncz, C.
    Szabados, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/80061.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    oxidative stress
    heat shock factor
    Arabidopsis
    environmental stress
    salt stress
    overexpression
    hydrogen peroxide
    lipid peroxidation
    mitogen-activated protein kinase
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transcriptomic profiling of linolenic acid-responsive genes in ROS signalling from RNA-seq data in Arabidopsis
    Autorzy:
    Mata-Perez, C.
    Sanchez-Calvo, B.
    Begara-Morales, J.
    Padilla, M.
    Valderrama, R.
    Luque, F.
    Fernandez-Ocana, A.
    Corpas, F.
    Barroso, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/80890.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    linoleic acid
    polyunsaturated fatty acid
    jasmonic acid
    phytohormone
    reactive oxygen species
    hydrogen peroxide
    gene expression
    Arabidopsis thaliana
    lipoxygenase
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Endophytic colonisation of tomato by the entomopathogenic fungus Beauveria bassiana: the use of different inoculation techniques and their effects on the tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae)
    Autorzy:
    Allegrucci, N.
    Velazquez, M.S.
    Russo, M.L.
    Perez, E.
    Scorsetti, A.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/65417.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    endophytic fungi
    tomato
    entomopathogen
    fungi
    Beauveria bassiana
    inoculation method
    tomato leafminer
    Tuta absoluta
    Lepidoptera
    Gelechiidae
    biological control
    Solanum lycopersicum
    Opis:
    Fungal entomopathogens can naturally regulate populations of various insects. The entomopathogen Beauveria bassiana (Bals.- Criv.) Vuill. is also able to endophytically colonize different plants. Endophytic colonization by entomopathogens may provide a source of indirect interactions between fungi and insects and has been associated with the ability of the fungus to control insect pests. The tomato leaf miner, Tuta absoluta (Meyrick) is considered one of the most devastating pests of tomato (Solanum lycopersicum L.) and its difficult control is due to its miner habit, short life cycle, and high reproductive capacity. The aims of this study were: (i) to use three different techniques, i.e. leaf spraying, seed immersion and root dipping, for the endophytic inoculation of B. bassiana in tomato plants; and (ii) to assess the effect of B. bassiana on tomato leaf consumption and mortality of T. absoluta after inoculation. The percentage of colonization by B. bassiana was assessed 7, 14 and 28 days after inoculation. All inoculation techniques employed allowed the recovery of B. bassiana, although our results showed significant differences between techniques. Leaf spraying was the most effective, with the highest percentage of colonization recorded 7 days after inoculation. We also evaluated (i) the effect on the mortality of T. absoluta by direct contact with conidia of B. bassiana, and (ii) the effect on tomato leaf consumption and mortality by indirect contact through ingestion of inoculated plant tissues with B. bassiana. Mortality bioassays showed that B. bassiana infected T. absoluta, either by direct contact or indirectly, via ingestion of inoculated tomato leaves. Direct contact showed a higher percentage of mortality and a lower median survival time (MST) than indirect contact. Significant differences in the mortality percentages of T. absoluta after exposure with B. bassiana were found among the treatments and the control. Our results suggest that the endophytic inoculation of B. bassiana in tomato crops provides the basis for further investigation, which should focus on the virulence of the endophytic B. bassiana against T. absoluta.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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