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    Wyświetlanie 1-23 z 23
    Tytuł:
    Geoelectric method applied in correlation between physical characteristics and electrical properties of the soil
    Autorzy:
    Filho, A. M. S.
    Silva, C. L. B.
    Oliveira, M. A. A.
    Pires, T. G.
    Alves, A. J.
    Calixto, W. P.
    Narciso, M. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/136150.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    geoelectrical prospecting
    apparent
    electrical resistivity
    soil compaction
    moisture content
    Opis:
    This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics. Results obtained show correlations among apparent electrical resistivity of the soil, moisture, soil compaction and clay content.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 37-44
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A 3D trabecular bone homogenization technique
    Autorzy:
    Marques, Marco Costa
    Belinha, J.
    Oliveira, A. F.
    Manzanares Cespedes, M.C.
    Natal Jorge, R.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27324130.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fabric tensor
    homogenization technique
    multiscale
    bone
    tensor tkaniny
    technika homogenizacji
    wieloskalowe
    kość
    Opis:
    Purpose: Bone is a hierarchical material that can be characterized from the microscale to macroscale. Multiscale models make it possible to study bone remodeling, inducing bone adaptation by using information of bone multiple scales. This work proposes a computationally efficient homogenization methodology useful for multiscale analysis. This technique is capable to define the homogenized microscale mechanical properties of the trabecular bone highly heterogeneous medium. Methods: In this work, a morphology-based fabric tensor and a set of anisotropic phenomenological laws for bone tissue was used, in order to define the bone micro-scale mechanical properties. To validate the developed methodology, several examples were performed in order to analyze its numerical behavior. Thus, trabecular bone and fabricated benchmarks patches (representing special cases of trabecular bone morphologies) were analyzed under compression. Results: The results show that the developed technique is robust and capable to provide a consistent material homogenization, indicating that the homogeneous models were capable to accurately reproduce the micro-scale patch mechanical behavior. Conclusions: The developed method has shown to be robust, computationally less demanding and enabling the authors to obtain close results when comparing the heterogeneous models with equivalent homogenized models. Therefore, it is capable to accurately predict the micro-scale patch mechanical behavior in a fraction of the time required by classic homogenization techniques.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 3; 139--152
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Eocene South American metatherian Zeusdelphys complicatus is not a protodidelphid but a hatcheriform: paleobiogeographic implications
    Autorzy:
    CARNEIRO, LEONARDO M.
    OLIVEIRA, ÉDISON VICENTE
    Powiązania:
    https://bibliotekanauki.pl/articles/945640.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    mammalia
    metatheria
    hatcheriformes
    zeusdelphys
    paleobiogeography
    systematics
    eocene
    itaboraí
    basin
    Opis:
    Zeusdelphys complicatus is one of the most enigmatic metatherians from the Itaboraí Basin. The type and only known specimen was previously regarded as the upper dentition of Eobrasilia; an M4 of a new taxon; an M3 of a Kollpaniidae (now regarded as a group of “condylarths”); a probable M1 of an incertae sedis taxon; and as an M1 of a Protodidelphidae. Herein, we present a morphological review of the dental structures of Zeusdelphys complicatus, presenting new interpretations and comparing it with other North and South American taxa. We also perform a phylogenetic analysis in order to test the affinities of Zeusdelphys and the validity of most studied characters. The results recovered Zeusdelphys complicatus as more closely related to Hatcheritherium alpha than to any other metatherian. Glasbiidae were recovered as the sister lineage of Protodidelphidae within Didelphimorphia, as true marsupials. Ectocentrocristus was recovered as the sister taxon of Zeusdelphys + Hatcheritherium, as a Hatcheriformes. The analysis recovered this suborder as an independent lineage from Polydolopimorphia, being more closely related to “Alphadontidae”. The affinities with Protodidelphidae are a result of convergent evolution, as Zeusdelphys is more closely related to Hatcheritherium alpha from the Late Cretaceous of North America. The results support a North American origin for Hatcheriformes. The presence of strong sea-level lowstands and islands in the Caribbean Plate during the Late Cretaceous provide valid data to support a faunal interchange between Americas during the latest Late Cretaceous. Based on the results, Zeusdelphys represents a South American early Eocene surviving Hatcheriformes.
    Źródło:
    Acta Palaeontologica Polonica; 2017, 62, 3; 497-507
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parasites community of Astronotus crassipinnis (Cichlidae), a fish from the Brazilian Amazon
    Autorzy:
    Santos, G.G.
    Oliveira, M.S.B.
    Neves, L.R.
    Tavares-Dias, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/972319.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    aggregation
    parasites
    Amazon
    Astronotus crassipinnis
    Cichlidae
    Opis:
    We provide the first study on the diversity and community of parasites in Astronotus crassipinnis from the lower Amazon River, in Brazil. Of 35 hosts examined, 100% were infected with one or more species of parasites, such as Gussevia asota, Gussevia astronoti, Gussevia rogersi, Posthodiplostomum sp., Contracaecum sp., Gorytocephalus sp. and Dolops longicauda. Gussevia asota, G. astronoti and G. rogersi were dominant, and, in total, 9788 parasites were collected. The richness of parasite species (4.9±0.7), Brillouin diversity (0.46±0.28) and evenness (0.29±0.17) were low. Parasites had aggregated dispersion, parasitism did not affect the host condition factor, and host size did not influence abundance, species richness and parasite diversity. The parasitic fauna was characterized by the presence of few species of parasites with high prevalence and low abundance, specifically the endoparasites, besides dominance of ectoparasites. The presence of endoparasites indicates that the diet of A. crassipinnis consists mostly of mollusks and microcrustaceans. This fish species is an intermediate host for Posthodiplostomum sp., Contracaecum sp. and Gorytocephalus sp., parasites found in larval stage. Finally, the behavior and availability of infective stages, which are intermediate hosts for endoparasites, were factors structuring the communities of endoparasites.
    Źródło:
    Annals of Parasitology; 2018, 64, 2; 121-128
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monogenoidea parasites of Cichla monoculus and Cichla pinima (Osteichthyes: Cichlidae), sympatric fish in lower Tapajós River, Northern Brazil
    Autorzy:
    Oliveira, M.S.B.
    Adriano, E.A.
    Tavares-Dias, M.
    Correa, L.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/6677.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Źródło:
    Annals of Parasitology; 2019, 65, 4
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of heuristic regression method applied in descriptive data analysis: case studies
    Autorzy:
    Gomes, F. A.
    Assis, A. de O.
    Reis, M. R. da C.
    Gomes, V. M.
    Oliveira, S. G. M.
    Araujo, W. R. H. de
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136229.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    regression
    data analysis
    optimization
    heuristic
    modeling
    Opis:
    The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 51-57
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric properties of papaya seeds from 75 kHz to 5 MHz
    Autorzy:
    Berbert, P.A.
    Soares, K.J.
    Moura, E.E.
    Berbert-Molina, M.A.
    Oliveira, M.T.R.
    Martinazzo, A.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082500.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    Carica papaya L.
    dielectric loss factor
    moisture content
    relative permittivity
    seed bulk density
    Opis:
    The object of this work was to study the dielectric properties of papaya seeds of the Golden cultivar and seeds of two papaya hybrids, Tainung and Calimosa, in the frequency range from 75 kHz to 5 MHz at four levels of bulk density, and with moisture contents ranging from 6 to 23% wet basis. The relative permittivity and the loss factor of the seeds were measured using a precision LCR meter, and their relationship with the variable frequency of the oscillating electric field, the seed moisture content and bulk density, and the cultivar/hybrid type were established. Relative permittivity for each value of the moisture content was reduced regularly as the frequency increased. Abrupt changes in the slopes of the curves demonstrating the relationship between the relative permittivity and the loss factor, and the moisture content were considered an indication of changes in the water sorption mechanisms occurring within the seed. The relationship between the relative permittivity and the loss factor, and bulk density was represented by linear functions with positive slopes. The effect of the cultivar or hybrid types on the relative permittivity and the loss factor revealed that seeds of the Golden cultivar and the Tainung hybrid exhibited similar relative permittivity values in the whole frequency range studied, in contrast to seeds of the Calimosa hybrid.
    Źródło:
    International Agrophysics; 2019, 33, 2; 185-192
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of a pull system – a case study of a polymeric production system for the automotive industry
    Autorzy:
    Martins, Bruna
    Silva, Cláudia
    Silva, Diogo
    Machado, Laura
    Brás, Miguel
    Oliveira, Rui
    Carvalho, Tiago
    Silva, Vera
    Lima, Rui M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037393.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    Kanban
    Leveling
    pull production
    SMED
    Supermarket
    Opis:
    This work, developed as a case study, propose, describe, and evaluates an implementation of a pull system in a SME company producing polymeric components for the automotive industry. The production system of the company was based on the push paradigm, which creates high stock levels and high lead times. The main purpose was to develop a pull production system controlled by Kanbans in the painting line. To achieve this goal, this case study demonstrates the application of relevant lean tools, such as, VSM, SMED, Kanban System, Supermarkets and Leveling. Through the SMED’s application, it was possible to reduce the setup times in 38% and make annual earnings of approximately 83000€. The application of a Kanban System, Leveling and Supermarket enabled the WIP’s reduction between injection and painting in 56% and, also, between painting and expedition in 45%. Also, the lead time decreased and the value-added time increased. Thus, this is an exemplary case study for the implementation of a pull system and can be used both by practitioners and researchers interested in this theme.
    Źródło:
    Management Systems in Production Engineering; 2021, 4 (29); 253-259
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and thermal properties of commercial multilayer flexible plastic packaging materials irradiated with electron beam
    Autorzy:
    Oliveira, V. M.
    Nogueira, B. R.
    Ortiz, A. V.
    Moura, E. A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146772.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron-beam radiation
    multilayer packaging materials
    mechanical properties
    thermal properties
    Opis:
    The effects of electron-beam irradiation on mechanical and thermal properties were studied for two commercial multilayer structures of flexible food packaging. Both the laminated poly(ethylene terephthalate) (PET)/ low-density polyethylene (LDPE) and the coextruded LDPE/polyamide(PA)/LDPE structures were irradiated up to 120 kGy using a 1.5 MeV electron beam accelerator, at room temperature in the presence of air. Mechanical properties showed significant changes (p < 0.05), specially in sealability that was severely affected. Changes in mechanical properties were discussed in relation to the eight day and the six month period after irradiation. In addition, the DSC analysis six months after treatment showed that the fusion enthalpy of the PET/LDPE structure components increase for the LDPE from 10 kGy and decrease for the PET up to 120 kGy (p < 0.05). On the other hand, the LDPE/PA6/ LDPE presented increase in the LDPE and PA up to 120 kGy, except for LDPE at 10 and 15 kGy and PA at 5 kGy doses (p < 0.05). The effects of irradiation were less severe for the LDPE/PA6/LDPE than for the PET/LDPE. The electron-beam irradiation did not show advantageous results that could be of interest for commercial applications for the film industry, but brings important information about the packaging behavior for food producers who may decide to use irradiation as a form of cold pasteurization of their packed products.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 141-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of multigrid parameters in a 3D heat diffusion equation
    Autorzy:
    de Oliveira, F.
    Franco, S. R.
    Villela Pinto, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/264346.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    metoda różnic skończonych
    metoda Gaussa-Seidela
    dyfuzja ciepła
    multigrid
    finite differences
    Poisson 3D
    solvers
    parameters
    Opis:
    The aim of this paper is to reduce the necessary CPU time to solve the three-dimensional heat diffusion equation using Dirichlet boundary conditions. The finite difference method (FDM) is used to discretize the differential equations with a second-order accuracy central difference scheme (CDS). The algebraic equations systems are solved using the lexicographical and red-black Gauss-Seidel methods, associated with the geometric multigrid method with a correction scheme (CS) and V-cycle. Comparisons are made between two types of restriction: injection and full weighting. The used prolongation process is the trilinear interpolation. This work is concerned with the study of the influence of the smoothing value (v), number of mesh levels (L) and number of unknowns (N) on the CPU time, as well as the analysis of algorithm complexity.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 213-221
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of grounding grids parameter at arbitrary geometry
    Autorzy:
    Silva, C. L. B.
    Pires, T. G.
    Calixto, W. P.
    Oliveira, D. N.
    Souza, L. A. P.
    Filho, A. M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/136173.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    grounding grids parameters
    Heppe
    soil stratified in two layers
    Opis:
    This paper deals with the computation of ground resistance, surface voltage, touch voltage and step voltage, to mesh with horizontal wires arranged in different angles. The computer program implemented used in the mathematical modeling is based on the method proposed by Heppe, which allows obtaining the grounding parameters for homogeneous soil and soil stratified in two layers. The results obtained with the proposed method will be compared with other methods in literature. Also will be presented the results of a grounding grid using wires at various angles.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 11-17
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Orbit Coupling in n-Type PbTe/PbEuTe Quantum Wells
    Autorzy:
    Peres, M. L.
    Chitta, V. A.
    Maude, D. K.
    Oliveira, N. F.
    Rappl, P. H. O.
    Ueta, A. Y.
    Abramof, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047927.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    72.25.Rb
    73.20.Fz
    73.63.Hs
    Opis:
    Magnetoresistance measurements were performed on an n-type PbTe/PbEuTe quantum well and weak antilocalization effects were observed. This indicates the presence of spin-orbit coupling phenomena and we showed that the Rashba effect is the main mechanism responsible for this spin-orbit coupling. Using the model developed by Iordanskii et al., we fitted the experimental curves and obtained the inelastic and spin-orbit scattering times. Thus we could compare the zero field energy spin-splitting predicted by the Rashba theory with the energy spin-splitting obtained from the analysis of the experimental curves. The final result confirms the theoretical prediction of strong Rashba effect on IV-VI based quantum wells.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 602-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Important phytopathogenic airborne fungal spores in a rural area: incidence of Botrytis cinerea and Oidium spp.
    Autorzy:
    Oliveira, M
    Guerner-Moreira, J.
    Mesquita, M.M.
    Abreu, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/49320.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    airborne fungi
    fungi
    airborne spore
    grey mould
    phytopathology
    powdery mildew
    rural area
    Botrytis cinerea
    Oidium
    Vitis vinifera
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2009, 16, 2; 197-204
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    “Ah non, je ne parle pas anglais moi. Je suis française !” Une contribution à la typologie des pragmatèmes
    “Oh no, I do not speak English. I’m French!” A contribution to the typology of pragmatems
    Autorzy:
    de Oliveira, Ruth
    Powiązania:
    https://bibliotekanauki.pl/articles/1789284.pdf
    Data publikacji:
    2020-12-23
    Wydawca:
    Wydawnictwo Uniwersytetu Śląskiego
    Tematy:
    Pragmatem
    clitic doubling
    French language
    language acts
    Opis:
    This work presents and discusses the development of the hypothesis according to which clitic doubling (pronominal reduplication), as seen in the sentence “Je ne parle pas anglais moi. / I do not speak English [me]”, has the fundamental structural and pragmatic parameters of the pragmatem (R. D e O l i v e i r a, 2018). Structural, because it is a compositional construction but selected as a whole by the speaker to respond to a communication goal associated with a precise utterance situation (G. F l é c h o n et al., 2012); pragmatic, since this device is a means of acting on the interlocutive context, allowing the accomplishment of a certain number of specific acts (I. M e l’č u k, 2013). In this sense, we argue that, like the pragmatem, the devise called French clitic doubling simultaneously has the following three characteristics, it is (i) fixed, (ii) compositional, and (iii) associated with a specific utterance situation.
    Źródło:
    Neophilologica; 2020, 32; 132-145
    0208-5550
    2353-088X
    Pojawia się w:
    Neophilologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge-Ordering and Magnetoelastic Coupling Effects on the Magnetocaloric Properties of Manganites
    Autorzy:
    Reis, M. S.
    Gomes, A. M.
    Araújo, J. P.
    Tavares, P. B.
    Amaral, J. S.
    Oliveira, I. S.
    Amaral, V. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037124.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Kz
    75.80.+q
    Opis:
    A study of the magnetocaloric properties of La$\text{}_{1-x-y}$Y$\text{}_{y}$Ca$\text{}_{x}$MnO$\text{}_{3}$, La$\text{}_{1-x}$Cd$\text{}_{x}$MnO$\text{}_{3}$, and Pr$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ manganites with ferromagnetic and charge-ordered states is presented. The ferromagnetic lanthanum manganites show a negative entropy change peakΔ S under the application of a magnetic field at the Curie temperature. However, the magnetoelastic coupling effects lead to a first-order paramagnetic-ferromagn etic transition and an increasedΔ S compared to simple ferromagnets. This effect is analyzed in the framework of the Landau theory of phase transitions which shows a comparable influence of the magnetoelastic couplings and the ordinary magnetic ordering effect. The Pr$\text{}_{1-x}$Ca$\text{}_{x}$MnO $\text{}_{3}$ system shows a rich electric and magnetic phase diagram, with a ferromagnetic insulator phase for 0.15
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 163-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and design of a MOSFET-only wideband balun LNA
    Autorzy:
    Bastos, I.
    Oliveira, L. B.
    Goes, J.
    Silva, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/397861.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    tranzystor polowy MOS-tylko obwody
    redukcja hałasu
    CMOS LNAs
    MOSFET-only circuits
    noise cancelling
    wideband LNA
    Opis:
    In this paper we present a MOSFET-only implementation of a balun LNA. This LNA is based on the combination of a common-gate and a common-source stage with cancellation of the noise of the common-gate stage. In this circuit, we replace resistors by transistors, to reduce area and cost, and to minimize the effect of process and supply variations and mismatches. In addition, we obtain a higher gain for the same voltage drop. Thus, the LNA gain is optimized and the noise figure (NF) is reduced. We derive equations for the gain, input matching and NF. The performance of this new topology is compared with that of a conventional LNA with resistors. Simulation results with a 130 nm CMOS technology show that we obtain a balun LNA with a peak gain of 20.2 dB (about 2 dB improvement), and a spot NF lower than 2.4 dB. The total power consumption is only 4.8 mW for a bandwidth higher than 6 GHz.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 3; 241-248
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hypertonic saline solution (NaCl 7.2%) enhances renal excretion of acids in cattle with acute ruminal lactic acidosis
    Autorzy:
    Rodrigues, F.A.M.L.
    Minervino, A.H.H.
    Barrêto Júnior, R.A.
    Reis, L.F.
    Ferreira, R.N.F.
    Mori, C.S.
    Oliveira, F.L.C.
    Sousa, R.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087583.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steers
    ruminal lactic acidosis
    hypertonic saline solution
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 1; 37-42
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling methods of predicting potato yield - examples and possibilities of application
    Metody modelowania predykcji plonu ziemniaków – przykłady i możliwości zastosowania
    Autorzy:
    Piekutowska, M.
    Niedbała, G.
    Adamski, M.
    Czechlowski, M.
    Wojciechowski, T.
    Czechowska-Kosacka, A.
    Wójcik Oliveira, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/337475.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
    Tematy:
    yield prediction
    potato
    artificial neural networks
    regression
    predykcja plonowania
    ziemniak
    sztuczne sieci neuronowe
    regresja
    Opis:
    The purpose of the following work is to review the methods used in predicting plant yields, with particular emphasis on potato production. The article refers to the histological methods of estimating plant yields and prevailing trends: groundbased remote sensing, which is often associated with regression calculus, multiple regression, artificial intelligence and image analysis. There are also two popular models SUBSTOR and LINTUL-POTATO, which are the foundation for developing more and more accurate tools of potato yield estimation. There are many methods that allow to predict yields before the end of the growing season. The most important element in creating prediction models is choosing the appropriate number of independent variables that actually shape the yielding of potatoes. Timely and accurate prediction of crop yields improve the management of agricultural production as well as limit financial, quantitative and qualitative losses of crops.
    Celem niniejszej pracy był przegląd metod wykorzystywanych w prognozowaniu plonów roślin ze szczególnym uwzględnieniem produkcji ziemniaka. W artykule nawiązano do historycznych sposobów szacowania plonów roślin oraz obecnie panujących trendów w predykcji: teledetekcji naziemnej, która często powiązana jest z rachunkiem regresyjnym, regresji wielorakiej, sztucznej inteligencji, analizie obrazów. Wspomniano także o dwóch popularnych modelach SUBSTOR i LINTULPOTATO, które stworzyły podwaliny do opracowywania coraz dokładniejszych narzędzi prognozujących plony ziemniaków. Wiele metod pozwala na predykcję plonów przed zakończeniem sezonu wegetacyjnego. Najistotniejszym elementem tworzenia modeli predykcyjnych jest dobór odpowiedniej liczby zmiennych niezależnych, które rzeczywiście kształtują plonowanie ziemniaków. Terminowe i dokładne prognozy plonów roślin uprawnych usprawniają zarządzanie produkcją rolniczą, pozwalają na ograniczanie strat finansowych, ilościowych i jakościowych plonów.
    Źródło:
    Journal of Research and Applications in Agricultural Engineering; 2018, 63, 4; 176-180
    1642-686X
    2719-423X
    Pojawia się w:
    Journal of Research and Applications in Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ergonomic evaluation of workload by milk production - a bibliometric analysis
    Autorzy:
    Caldas de Oliveira, Claudilaine
    Pereira Moro, Antônio Renato
    Ulbricht, Leandra
    Belinelli, Marjorie
    de Souza, Gilberto F.M.
    Gabriel, Michele
    Zattar, Izabel Cristina
    Powiązania:
    https://bibliotekanauki.pl/articles/989503.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    milk production
    ergonomics
    dairy farming
    work environment
    bibliometric analysis
    Opis:
    Introduction and Objective. The purpose of this study was to select in a structured manner the relevant articles with scientific recognition, and simultaneously identify the characteristics of these publications that may scientifically enrich the theme in a portfolio of papers. The theme involves ergonomics in milk production as a criterion for evaluating and improving organizational performance in the milking sector. Materials and Method. The study used ProKnow-C as a theoretical instrument for intervention. Results. The main results show: i) a bibliographic portfolio of 18 items aligned with the view adopted by researchers which served as a theoretical framework for this research; ii) The article entitled “Wrist positions and movements as possible risk factors during machine milking”, by Marianne Stål, Gert-Åke Hansson and Ulrich Moritz in 1999 and published in the Journal of Applied Ergonomics presented the highest scientific recognition, iii) the authors highlighted in the bibliographic portfolio or in its references researching the subject are Gert-Åke Hansson, Marianne Stål and Stefan Pinzke, and iv) the International Journal of Industrial Ergonomics shows the highest number of scientific articles in the bibliographic portfolio. Conclusions. The studies selected using the methodology indicate research in ergonomics focused on the production of milk in rural areas, specifically in the milking sector, are generally related to the health and safety of the workers.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2017, 24, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrating coagulation and Fenton’s oxidation for pharmaceutical effluents treatment
    Koagulacja połączona z utlenianiem Fentona w oczyszczaniu ścieków farmaceutycznych
    Autorzy:
    Martins, R. C.
    Oliveira, A. C.
    Quinta-Ferreira, R. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073214.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    pharmaceutical wastewater
    heterogeneous Fenton's process
    photo-Fenton process
    low cost catalysts
    biodegradability
    ścieki farmaceutyczne
    heterogeniczny proces Fentona
    reakcja foto-Fentona
    kataliza nisko-kosztowa
    biodegradowalność
    Opis:
    Pharmaceutical industry produces complex and bio-refractory wastewater whose discharge throughout water courses constitutes an environmental danger. Although several works can be found handling with simulated pharmaceutical effluents, data reporting results gathered using actual wastewater is still scarce. This work reveals that Fe-Ce-O and red volcanic rock are interesting catalysts for dark and photo-Fenton. Furthermore, the light/H2O2 system showed interesting results and it is now being explored at the pilot scale by the pharmaceutical industry that provided the effluent.
    Przemysł farmaceutyczny wytwarza złożone i bioodporne ścieki, których zrzut zwykła drogą stwarza zagrożenie dla środowiska. Pomimo tego, że kilka prac zajmuje się transportem symulowanych ciekłych odpadów farmaceutycznych, dane dotyczące rzeczywistych ścieków są wciąż skąpe. W prezentowanej pracy stwierdzono, że Fe-Ce-O i czerwona skała wulkaniczna są ciekawymi katalizatorami w reakcji foto-Fentona. Ponadto układ światło/H2O2 wykazał się interesującymi właściwościami i obecnie jest badany w skali pilotowej przy obróbce ścieków w przemyśle farmaceutycznym.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2015, 4; 174--177
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytochemical potential of Ficus species for the control of the phytonematode Meloidogyne javanica
    Autorzy:
    Alves, J.R.
    De Assis, J.N.
    Padua, C.C.A.
    Balbino, H.M.
    Lima, L.L.
    De Souza Gouveia, A.
    Vital, C.E.
    Buonicontro, D.S.
    De Freitas, L.G.
    Leite, J.P.V.
    De Oliveira Ramos, H.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082765.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas chromatography/mass spectrometry (GC/MS)
    metabolite profiling
    pest
    control
    phytochemistry
    Opis:
    Root-knot nematodes, genus Meloidogyne, are among the most plant damaging pathogens worldwide. The action of natural products against plant pathogens has been investigated to assess their effectiveness in the control of diseases. Thus, the present study aimed to evaluate the phytochemistry potential of the Ficus species for the control of Meloidogyne javanica. In vitro inhibitory activity assays were performed with crude ethanolic extracts of leaves and branches from 10 Ficus species. Among these, Ficus carica extracts exhibited strong paralysis activity against second stage juveniles (J2) (EC50 = 134.90 μg ∙ ml–1 ), after 72 hours. In addition, high efficacy was observed in egg-hatching inhibition at different embryonic stages. Microscopy analysis revealed severe morphological alterations in the nematode tissues at the J2 stage, as well as immotility of juveniles released from eggs in the presence of F. carica extracts. The efficacy of the treatments for the other species was very low. These differences were supported by the variation in the compound classes, mainly for alkaloids and metabolite profiles by Gas Chromatography/Mass Spectrometry (GC/MS) when F. carica was compared with the other species. The results indicated that F. carica is a promising source for the isolation and identification of molecules capable of acting in the control of M. javanica.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 2; 193-206
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hemifacial asymmetries in age perception: the left cheek looks older for females, but not males
    Autorzy:
    Lindell, Annukka K
    Cianchetta, Rhiannon O
    Azim, Sana M
    Freeman, Cody G
    de Oliveira, Nicole C
    Saban, Sakire
    Messina, Julia L
    Wilson, Kira Elise
    Egan, Alanna
    Caspar, Megan D
    Grey, Emma J
    McDonald, Bryce A
    Croxford, Kylie N
    Bui, Thu Trang
    Aiello, Ashley A
    Heywood-Smith, Victoria M
    Kidd, Andrew J
    Stanley, Shenae C
    Wakeling, Alarna
    Hoggan, Stephanie A.L
    Morriss, Ashleigh S
    Trinh, Thi Phuong Mai
    Thai-Nguyen, Hong
    Fonte, Melissa
    Agolli, Franceska
    Powiązania:
    https://bibliotekanauki.pl/articles/2106020.pdf
    Data publikacji:
    2019-12-18
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    emotion
    asymmetry
    hemisphere
    laterality
    age
    Opis:
    The left hemiface expresses emotion more intensely than the right. Because emotional expressions contract the facial muscles and wrinkle the skin, theoretically the left hemiface’s greater expressivity should prompt more pronounced expression lines and wrinkles on the left than right side of the face. As wrinkles are the most salient age cue, we investigated whether the left hemiface consequently appears older than the right. Two hundred and sixty participants (F=148; M=112) viewed booklets containing pairs of left-left and right-right chimeric faces of eight models (M=F). For each trial participants were asked to make a two alternative forced choice response indicating which image looked older. Results confirmed a left cheek bias, with participants more likely to select left-left than right-right chimeras. Whilst participant gender did not influence perceptions, model gender predicted cheek selections: responses to female models drive the overall left cheek bias. The left cheek (56.8%) appeared older than the right cheek (43.2%) for female models, whereas there was little difference in perceived age between male models' left (50.8%) and right (49.2%) cheeks. Given that youth influences perceptions of female beauty, these findings complement previous research and offer a potential explanation for why the left side of females’ faces are judged less attractive: the right cheek appears younger.
    Źródło:
    Acta Neuropsychologica; 2019, 17(4); 417-426
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facies architecture of the fluvial Missão Velha Formation (Late Jurassic-Early Cretaceous), Araripe Basin, Northeast Brazil : paleogeographic and tectonic implications
    Autorzy:
    Fambrini, G. L.
    Neumann, V. H. M. L.
    Menezes-Filho, J. A. B
    da Silva-Filho, W. F.
    de Oliveira, É. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/139001.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Araripe Basin
    Missão Velha Formation
    fluvial facies
    architectural element
    rift basins
    basen Araripe
    Missão Velha
    facje rzeczne
    element architektoniczny
    rów tektoniczny
    Opis:
    Sedimentological analysis of the Missão Velha Formation (Araripe Basin, northeast Brazil) is the aim of this paper through detailed facies analysis, architectural elements, depositional systems and paleocurrent data. The main facies recognized were: (i) coarse-grained conglomeratic sandstones, locally pebbly conglomerates, with abundant silicified fossil trunks and several large-to-medium trough cross-stratifications and predominantly lenticular geometry; (ii) lenticular coarse-to-medium sandstones with some granules, abundant silicified fossil wood, and large-to-medium trough cross-stratifications, cut-and fill features and mud drapes on the foresets of cross-strata, (iii) poorly sorted medium-grained sandstones with sparse pebbles and with horizontal stratification, (iv) fine to very fine silty sandstones, laminated, interlayered with (v) decimetric muddy layers with horizontal lamination and climbing-ripple cross-lamination. Nine architectural elements were recognized: CH: Channels, GB: Gravel bars and bed forms, SB: Sand bars and bedforms, SB (p): sand bedform with planar cross-stratification, OF: Overbank flow, DA: Downstream-accretion macroforms, LS: Laminated sandsheet, LA: Lateral-accretion macroforms and FF: Floodplain fines. The lithofacies types and facies associations were interpreted as having been generated by alluvial systems characterized by (i) high energy perennial braided river systems and (ii) ephemeral river systems. Aeolian sand dunes and sand sheets generated by the reworking of braided alluvial deposits can also occur. The paleocurrent measurements show a main dispersion pattern to S, SE and SW, and another to NE/E. These features imply a paleodrainage flowing into the basins of the Recôncavo-Tucano-Jatobá.
    Źródło:
    Acta Geologica Polonica; 2017, 67, 4; 515-545
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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