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    Wyświetlanie 1-12 z 12
    Tytuł:
    4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium
    Autorzy:
    Pereira, A.S.
    Ferreira, G.
    Caetano, L.
    Castro, R.S.D.
    dos Santos, A.
    Padilha, P.M.
    Castro, G.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778413.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    4-amino-2-merkaptopirymidyna
    krzemionka
    ekstrakcja metali
    środowisko wodne
    4-amine-2-mercaptopyrimidine
    silica
    metal extraction
    aqueous medium
    Opis:
    This paper discusses silica surface modification by a process involving a two-step reaction: anchoring of a silylating agent, followed by an attachment of a 4-amino-2-mercaptopyrimidine molecule. The modified material (Si-BP) was successfully characterized by the FTIR spectra, which revealed amine absorption bands, and through 13C and 29Si NMR spectra, which confirm the proposed structure of the modified silica (Si-BP). Si-BP was used to extract cadmium and lead from an aqueous medium at 298 K. The Si-BP kinetics towards metal ions was very fast, i.e., about 10 minutes, although extraction was significantly impaired at pH 3. The series of adsorption isotherms were adjusted to a modified Langmuir equation and the maximum extraction capacity was 0.193 and 0.387 mmol g-1 for Cd(II) and Pb(II), respectively. An analysis of the Ř values lead to the inference that the resulting metal ligand complex was type 1:1.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 1; 7-11
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a particle swarm optimization to a physically-based erosion model
    Zastosowanie optymalizacji zbioru rozproszonych czasteczek do modelu erozji opartego na podstawach fizycznych
    Autorzy:
    Santos, C A G
    Pinto, L.E.M.
    De Macedo Machado Freire, P.K.
    Mishra, S.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/81761.pdf
    Data publikacji:
    2010
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    particle swarm optimization
    application
    erosion model
    erosion simulation
    run-off
    optimization
    erosion parameter
    Opis:
    The difficulties involved in calibration of physically based erosion models have been partly attributable to the lack of robust optimization tools. This paper presents the essential concepts and application to optimize channel and plane parameters in an erosion model, with a global optimization method known as Repulsive Particle Swarm (RPS), a variant of Particle Swarm Optimization (PSO) method. The physically-based erosion model that which was chosen is called WESP (watershed erosion simulation program). The optimization technique was tested with the field data collected in an experimental watershed located in a semi-arid region of Brazil. On the basis of these results, the recommended erosion parameter values for a semi-arid region are given, which could serve as an initial estimate for other similar areas.
    Trudności w kalibracji modeli erozji opartych na podstawach fizycznych przyczyniły się do braku ogólnych narzędzi optymalizacji. W pracy przedstawiono podstawowe koncepcje i zastosowanie do zoptymalizowania parametrów kanału i płaszczyzny w modelu erozji, globalną metodą optymalizacji znaną jako Repulsive Particle Swarm (RPS), wariantem metody Particle Swarm Optimisation (SPO). Fizycznie uzasadniony model erozji, który został wybrany jest nazywany WESP (watershed erosion simulation program). Technika optymalizacji została wypróbowana na danych terenowych zebranych w zlewni eksperymentalnej zlokalizowanej w umiarkowanie suchym regionie Brazylii. Na podstawie tych wyników przedstawiono wartości rekomendowanego parametru erozji dla umiarkowanie suchego regionu, który może służyć jako początkowe oszacowanie dla podobnych obszarów.
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 39-49
    0208-5771
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building on the concept of marine biological valuation with respect to translating it to a practical protocol: Viewpoints derived from a joint ENCORA-MARBEF initiative
    Autorzy:
    Derous, S.
    Austen, M.
    Claus, S.
    Daan, N.
    Dauvin, J.-C.
    Deneudt, K.
    Depestele, J.
    Desroy, N.
    Heessen, H.
    Hostens, K.
    Marboe, A.H.
    Lescrauwaet, A.-K.
    Moreno, M.P.
    Moulaert, I.
    Paelinckx, D.
    Rabaut, M.
    Rees, H.
    Ressurreicao, A.
    Roff, J.
    Santos, P.T.
    Speybroeck, J.
    Stienen, E.W.M.
    Tatarek, A.
    Hofstede, R.T.
    Vincx, M.
    Zarzycki, T.
    Degraer, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48603.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine biological valuation
    ecological criterion
    marine biodiversity
    intrinsic value
    ENCORA-MARBEF concept
    Opis:
    Marine biological valuation provides a comprehensive concept for assessing the intrinsic value of subzones within a study area. This paper gives an update on the concept of marine biological valuation as described by Derous et al. (2007). This concept was based on a literature review of existing ecological valuation criteria and the consensus reached by a discussion group of experts during an international workshop in December 2004. The concept was discussed during an ENCORA –MARBEF workshop in December 2006, which resulted in the fine-tuning of the concept of marine biological valuation, especially with respect to its applicability to marine areas.
    Źródło:
    Oceanologia; 2007, 49, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cold Atomic Gases in Optical Lattices with Disorder
    Autorzy:
    Schulte, T.
    Drenkelforth, S.
    Kruse, J.
    Ertmer, W.
    Arlt, J. J.
    Kantian, A.
    Sanchez-Palencia, L.
    Santos, L.
    Sanpera, A.
    Sacha, K.
    Zoller, P.
    Lewenstein, M.
    Zakrzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044614.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Kk
    03.75.Lm
    05.30.Jp
    64.60.Cn
    Opis:
    Cold atomic gases placed in optical lattices enable studies of simple condensed matter theory models with parameters that may be tuned relatively easily. When the optical potential is randomized (e.g. using laser speckle to create a random intensity distribution) one may be able to observe Anderson localization of matter waves for non-interacting bosons, the so-called Bose glass in the presence of interactions, as well as the Fermi glass or quantum spin glass for mixtures of fermions and bosons.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 89-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the JWL Constants for ANFO and Emulsion Explosives from Cylinder Test Data
    Autorzy:
    Sanchidrián, J. A.
    Castedo, R.
    López, L. M.
    Segarra, P.
    Santos, A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/358385.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    cylinder test
    JWL equation of state
    LS-DYNA
    ANFO
    emulsion explosives
    Opis:
    The Jones-Wilkins-Lee (JWL) equation of state parameters for ANFO and emulsion-type explosives have been obtained from cylinder test expansion measurements. The calculation method comprises a new radial expansion function, with a non-zero initial velocity at the onset of the expansion in order to comply with a positive Gurney energy at unit relative volume, as the isentropic expansion from the CJ state predicts. The equations reflecting the CJ state conditions and the measured expansion energy were solved for the JWL parameters by a non-linear least squares scheme. The JWL parameters of thirteen ANFO and emulsion type explosives have been determined in this way from their cylinder test expansion data. The results were evaluated through numerical modelling of the tests with the LS-DYNA hydrocode; the expansion histories from the modelling were compared with the measured ones, and excellent agreement was found.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 2; 177-194
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental results on advanced inertial fusion schemes obtained within the HiPER project
    Autorzy:
    Batani, D.
    Gizzi, L. A.
    Koester, P.
    Labate, L.
    Honrubia, J.
    Antonelli, L.
    Morace, A.
    Volpe, L.
    Santos, J. J.
    Schurtz, G.
    Hulin, S.
    Ribeyre, X.
    Nicolai, P.
    Vauzour, B.
    Dorchies, F.
    Nazarov, W.
    Pasley, J.
    Richetta, M.
    Lancaster, K.
    Spindloe, Ch.
    Tolley, M.
    Neely, D.
    Kozlová, M.
    Nejdl, J.
    Rus, B.
    Wołowski, J.
    Badziak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147696.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    advanced ignition schemes
    fast ignition
    shock ignition
    inertial fusion
    propagation of fast electrons
    short-pulse ultra-high-intensity laser
    shock compressed matter
    cylindrical implosions
    Opis:
    This paper presents the results of experiments conducted within the Work Package 10 (fusion experimental programme) of the HiPER project. The aim of these experiments was to study the physics relevant for advanced ignition schemes for inertial confinement fusion, i.e. the fast ignition and the shock ignition. Such schemes allow to achieve a higher fusion gain compared to the indirect drive approach adopted in the National Ignition Facility in United States, which is important for the future inertial fusion energy reactors and for realising the inertial fusion with smaller facilities.
    Źródło:
    Nukleonika; 2012, 57, 1; 3-10
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First record of mites associated with lima bean (Phaseolus lunatus L.)
    Autorzy:
    Neto, A.V.G.
    Silva, P.R.R.
    Silva, J.D.C.
    Dos Santos, M.F.
    Da Silva Melo, J.W.
    De Franca, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084632.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Tetranychidae
    pest mites
    legumes
    Opis:
    Pest mites of the family Tetranychidae are commonly reported in several legumes. However, reports of their occurrence in lima beans are insipient, especially in Brazil. The objective of this research was to record the occurrence of mites in lima bean plants and to describe their damage in this Fabaceae. Tetranychus neocaledonicus André and Mononychellus planki McGregor were found in lima bean plants, Phaseolus lunatus (Fabaceae or Leguminosae). The lima bean plants, when infested by these mites, initially exhibit small whitish spots in the leaflets, which with increasing population density rapidly evolve into chlorotic patches, followed by silvering, and may dry out and fall due to their overfeeding. The extent of the damage caused to lima bean plants and the adaptability of the mite to warm and dry conditions indicate that T. neocaledonicus has greater potential as a lima bean pest than M. planki in northeastern Brazil. This is the first record of these mites associated with P. lunatus.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 3; 418-422
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increasing photovoltaic panel power through water cooling technique
    Autorzy:
    Matias, C. A.
    Santos, L. M.
    Alves, A. J.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136175.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    photovoltaic panel
    water cooling
    increasing electrical efficiency
    efficiency increase
    Opis:
    This paper presents the development of a cooling apparatus using water in a commercial photovoltaic panel in order to analyze the increased efficiency through decreased operating temperature. The system enables the application of reuse water flow, at ambient temperature, on the front surface of PV panel and is composed of an inclined plane support, a perforated aluminum profile and a water gutter. A luminaire was specially developed to simulate the solar radiation over the module under test in a closed room, free from the influence of external climatic conditions, to carry out the repetition of the experiment in controlled situations. The first case study was published at EEEIC2016 conference where the panel was submitted to different rates of water flow, from 1 L/min to 4 L/min. In the test conditions without cooling apparatus, the panel reached about 70°C and produced approximately 63Wh. With the cooling apparatus with water flow rate of 2 L/min, the module reached about 50°C and produced approximately 77Wh. However, it has been observed that this water flow was overestimated. A second case study was carried out in order to perform the threshold between the flow and the energy produced. The best ratio was flow of 0.6 L/min and net energy of 77.41Wh. Gain of 22.69% compared to the panel without the cooling system. The best water flow rate was of 0.6 L/min and net energy of 77.41Wh. Gain of 22.69% compared to the panel without the cooling system.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 60-66
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of Hough technique in surgery of otosclerosis, using the finite element method
    Autorzy:
    Gentil, F.
    Parente, M.
    Martins, P.
    Santos, C.
    Almeida, E.
    Ferreira, A.
    Natali, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/307201.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metoda elementów skończonych
    otoskleroza
    wycięcie strzemiączka
    strzemiączko
    finite element method
    otosclerosis
    stapedectomy
    stapedotomy
    stapes
    Opis:
    Purpose: Otosclerosis is a metabolic bone disease of the otic capsule that can cause the stapes fixation, resulting in conductive hearing loss or, in a profound sensorineural deafness threshold. Surgery is one of the possible treatments for the otosclerosis. To repair small focus of otosclerosis in the anterior crus of the stapes, in 1960, Hough suggested the implementation of a technique in which part of the anterior crus is fractured and the stapes turned. As a result, the posterior crus of the stapes is the only connection with the inner ear. In this work, the outcome of Hough’s surgical technique was simulated. Methods: Based on computerized images, a finite element model of middle ear ossicles and tympanic membrane was created, as well as a model where the stapes has changed. The discretization of the tridimensional solid model was made using the ABAQUS software. The mechanical properties used were taken from the literature and adequate boundary conditions were applied. Results: The results obtained with the Hough technique simulation were compared with a representative model of the normal ear, taking into account the displacements obtained on the central part of the stapes footplate and the maximum principal stress in the stapes crus. Conclusions: The results obtained are closer to the normal ear model, therefore Hough technique stands out as a good option to correct small focus of otosclerosis.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 149-153
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial analysis of vegetal cover and sediment yield in Tapacura river catchment based on remote sensing and GIS
    Analiza przestrzenna ilosci sedymentu oraz pokrywy roslinnej w zlewni rzeki Tapacura okreslona na podstawie zdalnych obserwacji oraz analizy GIS
    Autorzy:
    Silva, R M
    Santos, C.A.G.
    Gico Lima Montenegro, S.M.
    Silva, L.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/81843.pdf
    Data publikacji:
    2010
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    spatial analysis
    vegetation cover
    sediment yield
    Tapacura River
    catchment
    remote sensing
    GIS analysis
    Opis:
    Mapping and assessment of erosion risk is an important tool for planning of natural resources management, allowing researchers to propose modifi cation in land-use properly and implement more sustainable management strategies in the long-term. The Tapacurá river catchment, located in Pernambuco State, Northeastern Brazil, is one of the planning units for management of water resources of Recife Metropilitan Region (RMR), and it is divided into 12 sub-basins. The objective of this study is to evaluate the spatial variability of vegetal cover and sediment yield in this basin through remote sensing and GIS techniques. Maps of the erosivity (R), erodibility (K), topographic (LS), cover-management (C) and support practice (P) factors were derived from the digital elevation model (DEM), climate database, and soil and NDVI maps, taking into account information available in the literature. In order to validate the simulation process, Sediment Delivery Ratio (SDR) was estimated. The obtained NDVI map showed vegetation loss during the analyzed period, indicating a distinct contrast between loss and gains of vegetation index. The vegetation and sediment yield mapping showed to be a useful tool for environmental monitoring and management, which can provide satisfactory results when jointly used. The results suggest a mean SDR around 0.9 and estimate the sediment yield as 23.98 ton/ha/month.
    Analiza przestrzenna ilości sedymentu oraz pokrywy roślinnej w zlewni rzeki Tapacura określona na podstawie zdalnych obserwacji oraz analizy GIS. Artykuł przedstawia sposób wykorzystania zebranych w terenie danych dotyczących pokrywy roślinnej oraz ilości sedymentu określonego za pomocą zdalnych obserwacji oraz analizy GIS w celu monitorowania środowiska i zarządzania zlewniami. W pracy wykorzystano metodę USLE-SDR, a także cyfrowy model terenu. Badania prowadzono w zlewni rzeki Tapacura w północno-wschodniej Brazylii. Wyniki sugerują przyjęcie wartości parametru SDR = 0,9, a oszacowana wielkość transportu rumowiska wynosi 23,98 t/ha/miesiąc.
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 5-16
    0208-5771
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional kinematic adaptations of gait throughout pregnancy and post-partum
    Autorzy:
    Branco, M. A. C.
    Santos-Rocha, R.
    Vieira, F.
    Aguiar, R.
    Veloso, A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/307113.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ciąża
    biomechanika
    kinematyka
    własności temporalne
    chód
    pregnancy
    biomechanics
    joint kinematics
    temporal parameters
    gait
    Opis:
    Purpose: The kinematic analysis of gait during pregnancy provides more information about the anatomical changes and contributes to exercise and rehabilitation prescription. The purposes were to describe and quantify the spatial, temporal and kinematic parameters in the joints of the lower limb during gait at the end of the first, second and third trimesters of pregnancy and in the postpartum period. Methods: A three-dimensional analysis was performed in eleven pregnant women. Repeated measures ANOVA was performed for comparisons between periods. Results: The longitudinal effect of pregnancy was not observed in spatial and temporal parameters. In joint kinematics the effect of pregnancy was observed in all joints for the three planes of motion. The hip joint and pelvis are the structures with more changes, and the results point to an increase in the anterior tilt of the pelvis as the pregnancy progresses, as well as a decrease of the amplitudes of the hip joint. The results suggested that pregnant women need to maintain the stability of the body, and become more efficient in locomotion. Conclusions: In general, the results retrieve the values from the beginning of pregnancy, indicating that the body was self-organized in order to overcome the morphological and physiological changes which women suffer during pregnancy, indicating that they have the ability to adapt depending on the demands, and after the effect of pregnancy is over, they return to values similar to those found in early pregnancy
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 153-162
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weather routing system architecture using onboard data collection and route optimisation
    Autorzy:
    Szłapczyńska, Joanna
    Vettor, Roberto
    Szłapczyński, Rafał
    Łącki, Mirosław
    Życzkowski, Marcin
    Hinostroza, Miguel A.
    Santos, Fernando P.
    Tycholiz, Wojciech
    Soares, C. Guedes
    Powiązania:
    https://bibliotekanauki.pl/articles/32899953.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    system architecture
    weather routing
    onboard data monitoring
    route optimisation
    data transmission optimisation
    Opis:
    This paper describes the architecture of a weather routing system consisting of two key elements: onboard monitoring and route optimiser sub-systems. The former is responsible for collecting various onboard measurements, such as current ship position or ship motion variables. These data, when gathered and processed, are then used for fine-tuning a ship model. The model, together with weather forecasts, is utilised by a multi-objective route optimiser to estimate forecasted ship responses during the voyage. The route optimiser has been developed in a client-server architecture to reallocate all necessary high-tech resources to the server side and keep the client software as simple and light as possible. The system also includes a module responsible for optimising transmission costs, to reduce onboard transmission during the voyage. The entire solution has been deployed onboard the demonstrator ship ‘Monte da Guia’ and tested during its operations at sea.
    Źródło:
    Polish Maritime Research; 2022, 2; 87-95
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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