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    Wyświetlanie 1-12 z 12
    Tytuł:
    On roughness measurement by angular speckle correlation
    Autorzy:
    Salazar, F.
    Belenguer, T.
    García, J.
    Ramos, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/220643.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    roughness
    speckle
    non-destructive testing
    Opis:
    In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 373-380
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wavelet-based Entropy Measure for Rate-Distortion Optimization in Image Coding
    Autorzy:
    Garcia-Alvarez, J.
    Führ, H.
    Castellanos-Dominguez, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/226142.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    entropy
    wavelet transform
    information measure
    rate distortion
    Opis:
    A novel method for calculation of the entropy measure in wavelet space is proposed. This perceived-based entropy measure uses a Second Order Model entropy estimator, in which the occurrence of neighbors is considered in formulation. It has the intention to allow the implementation of a more suitable measure in coding processes and a relationship between the metric and the description of perceptual features. This method is used for the Rate-Distortion optimization in order to improve the bit-allocation coding algorithm, demonstrating that the wavelet-based entropy estimates a truncation step close to the target rate. The hypothesis is founded in the effect of distortion on the coefficient allocation. Because entropy measure is a close approximation of the conditional probability of image in multiresolution space, it provides an adequate representation for the information of a Detail feature. A definition of Detail-based homogeneity variance criteria is used for the information quantity - wavelet representation space, in order to find the image that fits a given Quality Level criteria. Experimental results are obtained for artificial and natural databases.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 1; 25-31
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The OAE1a in Cuchía (Early Aptian, Spain): C and O geochemistry and global correlation
    Autorzy:
    García-Mondéjar, J.
    Fernández-Mendiola, P. A.
    Owen, H. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/139445.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cretaceous
    Aptian
    Basque-Cantabrian Basin
    C-O isotopes
    TOC
    kreda
    apt
    izotopy
    Opis:
    C-isotopes, TOC and O geochemical data from the lower Aptian Cuchía section in the western Basque-Cantabrian basin (BCB) allow an accurate delimitation of the OAE1a-equivalent and its geochemical Menegatti´s segments, a detailed δ13Ccarb correlation with regional and interregional sections, and a high-resolution construction of TOC and bulk-rock δ18Ocarb curves and their interpretation. The δ13Ccarb values range from -2‰ and +4‰ (VPDB). They agree with previous data from the eastern BCB sections (Aralar) confirming the ammonite age of the OAE1a in the Basque-Cantabrian basin: Deshayesites forbesi, Deshayesites deshayesi, and Deshayesites deshayesi-Dufrenoyia furcata transition Zones. Interregional δ13Ccarb correlation with pelagic (Cismon, Italy, and Mid-Pacific Mountains, DSDP Site 463) and neritic (Roquefort-La Bédoule, France) core sections, reveals a common profile of a wide negative excursion characteristic of the OAE1a. It consists of a double trough separated by a flat relative maximum, with two negative spikes in the upper trough of neritic sections. TOC absolute values range from 0.12% to 1.37%. Segments of the TOC curve with persistent low values closely correspond with descending segments of the δ13Ccarb curve, and are attributed to lesser organic productivity in the BCB. Detailed bulk-rock δ18Ocarb data (-5.71‰ to -1.05 ‰ PDB) and variation curve show two main positive O-isotope shifts and three minor positive inflections, within a general negative trend characteristic of the OAE1a. The two major positive shifts correspond to both shallowing upwards sequences and the lowermost can be related to a eustatic sea level fall. Independent interregional correlation of the O-isotope shifts with C-isotopes supports their interpretation as punctuating colder events within a general warming trend.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 4; 525-543
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Properties of TiC/Ti Coatings Deposited by the Supersonic Cold Gas Spray Technique
    Autorzy:
    Kusiński, J.
    Kac, S.
    Kowalski, K.
    Dosta, S.
    Georgiou, E. P.
    Garcia-Forgas, J.
    Matteazzi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356608.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold gas spraying
    Ti
    TiC
    CerMet coating
    SEM
    TEM
    wear resistance
    Opis:
    Nanostructured, biocompatible, TiC/Ti Supersonic Cold Gas Sprayed coatings were deposited onto a Ti6Al4V alloy and their microstructure, wear resistance and hardness were investigated. The starting nanostructured powder, containing a varied mixture of Ti and TiC particles, was produced by high energy ball milling. Scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction were used for structural and chemical analyses of powder particles and coatings. Coatings, 250-350 μm thick, preserving the nanostructure and chemical powder composition, with low porosity and relatively high hardness (~850 HV), were obtained. These nanostructured TiC/Ti coatings exhibited better tribological properties than commonly used biomedical benchmark materials, due to an appropriate balance of hard and soft nano-phases.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 867-873
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards the production of microalgae biofuels: the effect of the culture medium on lipid deposition
    Autorzy:
    Cuellar Garcia, D.J.
    Rangel-Basto, Y.A.
    Barajas-Solano, A.F.
    Munoz-Penalosa, Y.A.
    Urbina-Suarez, N.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/80961.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomass production
    biofuel
    microalga
    alga
    Chlorella vulgaris
    Scenedesmus obliquus
    renewable source
    culture medium
    lipid accumulation
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 3
    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:
    A new advisor system to detect the tap hole whistling and splashing in a Blast Furnace
    Nowy system doradczy do detekcji zjawiska wydmuchiwania i rozprysku z otworu spustowego w wielkim piecu
    Autorzy:
    Ruiz-Bustinza, I.
    Mochon, J.
    Verdeja, L. F.
    Garcia-Carcedo, F.
    Parra, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353337.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piec hutniczy
    optymalizacja
    blast furnace
    optimization
    Opis:
    The objective is to determine the moment from which a Blast Furnace tap hole must be closed and consequently the exit of materials (hot metal and slag), by studying the conventional video images obtained at the exit of the tap hole of the BF in order to optimize the process performance. This point is characterized by a remarkable increase in the width of the flow which corresponds to the maximum exit of the slag surrounding the melted metal (and a significant decrease in the pig iron). This video based system is compared to the information provided by the EMF signals (electromotive forces).
    W celu optymalizacji wydajności procesu wykonano pracę, której przedmiotem było określenie momentu w którym otwór spustowy wielkiego pieca musi zostać zatkany, a w konsekwencji również wypływ ciekłych produktów procesu (surówki, żużla) zakończony, określenie tego momentu, uzyskano przez analizę standardowych obrazów wideo wykonanych dla miejsca wydostania się ciekłych produktów z otworu spustowego. Moment ten charakteryzuje się znaczącym zwiększeniem szerokości przepływu strumienia, który odpowiada maksymalnemu wydostawaniu się żużla otaczającego ciekły metal (przy znaczącym zmniejszeniu wypływu surówki). System został oparty o technikę wideo, porównano go z informacjami dostarczonymi przez sygnał EMF (siły elektromotoryczne).
    Źródło:
    Archives of Metallurgy and Materials; 2010, 55, 4; 1125-1130
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental evaluation with chemical sensors in the Palace Museum of Wilanow
    Autorzy:
    Pena-Poza, J.
    Garcia-Heras, M.
    Palomar, T.
    Laudy, A.
    Modzelewska, E.
    Villegas, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200179.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heritage
    sensor
    acidity
    temperature
    sol-gel
    Wilanów
    Opis:
    Environmental evaluation arises as an innovative procedure to carry out preventive conservation of Cultural Heritage items. Parameters contributing to the proper conservation of such items can be monitored and assessed. Chemical sensors with optical response synthesised by the sol-gel method are useful for a complete and accurate environmental evaluation. Physical-chemical mechanisms of decay and degradation of materials can be predicted from the sensors response, which will favour the decisions on the adequate procedures to avoid damage. Sol-gel sensors prepared and applied in the present work are reversible, reusable and regenerable. Their optical response provides a change of colour vs. the parameters to which they are sensitive. Both temperature and environmental acidity have been monitored in several selected chambers of the Palace Museum of Wilanów (Warsaw, Poland). The optical response of sensors was recorded by visible spectrophotometry from June 2010 to December 2010. The results inform on the environmental conservation conditions, both indoor and outdoor the Palace. Main innovation of the research carried out concerns the evaluation of the environmental acidity as an essential parameter to be taken into account for the proper conservation that can not be measured by conventional methods.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 247-252
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transcriptome analysis of enzyme activities regulating ROS metabolism in olive (Olea europaea L.) reproductive tissues
    Autorzy:
    Zafra, A.
    Carmona, R.
    Jimenez-Quesada, M.
    Traverso, J.
    Castro, A.
    Rodriguez-Garcia, M.
    Bautista, R.
    Claros, M.
    Alche, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/80459.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    transcriptome
    enzyme activity
    reactive oxygen species
    metabolism
    olive
    Olea europaea
    reproductive tissue
    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:
    Efficacy comparison of intraperitoneal anaesthesia and post-operative analgesia regimens in laboratory rats
    Autorzy:
    Moreno-Mateo, F.
    García-Medrano, B.
    Álvarez-Barcia, A.
    Gayoso, M.J.
    Martín-Ferrero, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087353.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pain in rats
    anesthesia for rodents
    analgesia for rodents
    laboratory rats
    animal welfare
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 1; 127-132
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enzyme activities regulating ROS metabolism in olive ( Olea europaea L.) seeds
    Autorzy:
    Zienkiewicz, A.
    Jimenez-Quesada, M.
    Traverso, J.
    Zafra, A.
    Lopez-Huertas, E.
    Zienkiewicz, K.
    Castro, A.
    Rodriguez-Garcia, M.
    Alche, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/79927.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    enzyme activity
    reactive oxygen species
    metabolism
    olive
    Olea europaea
    seed
    antioxidative enzyme
    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:
    Synthesis of SrTiO3 by the Calcination of SrCO3 and TiO2 Mixtures Intensively Ground by Means of High Energy Milling
    Autorzy:
    Rocha-Rangel, Enrique
    Pech-Rodríguez, Wilian J.
    López-Hernández, Juan
    Calles-Arriaga, Carlos A.
    Armendáriz-Mireles, Eddie N.
    Castillo-Robles, José A.
    Rodríguez-García, José A.
    Powiązania:
    https://bibliotekanauki.pl/articles/356247.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SrTiO3
    mechanochemistry
    insulating ceramics
    perovskite
    Opis:
    A SrTiO3 electroceramic with perovskite structure was produced by the calcination of a mixture of SrCO3 and TiO2 intensively grounded by high energy milling. For this purpose, raw materials were mixed in stoichiometric amounts in a planetary type mill; the obtained powder mixture was calcined for 2 h at temperatures between 800 and 1300°C. Samples resulting from the calcination were characterized by XRD, FTIR, SEM analysis and electrical measurements. From XRD, it was determined that the SrTiO3 formed presents the cubic structure of perovskite. The complete reaction for SrTiO3 compound formation occurs at 1200°C. Micrograph observations indicate the presence of a homogeneous microstructure with tiny grain size. The measured values of electrical resistivity were within the typical range of insulating materials.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 621-626
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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