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Wyszukujesz frazę "Martins, J.C." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Failure control of Plutella xylostella (Lepidoptera: Plutellidae) and selectivity of their natural enemies to different insecticides
    Autorzy:
    Bacci, L.
    Rosado, J.F.
    Picanco, M.C.
    Gonring, A.H.R.
    da Silva Galdino, T.V.
    Martins, J.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/66522.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biological control
    Plutella xylostella
    Lepidoptera
    Plutellidae
    selectivity
    plant pest
    natural enemy
    insecticide
    Brassica
    crop
    cabbage moth
    Opis:
    Control failure of pests and selectivity of insecticides to beneficial arthropods are key data for the implementation of Integrated Pest Management (IPM) programs. Therefore, the aim of this study was to assess the control failure likelihood of Plutella xylostella and the physiological selectivity active ingredients to parasitoid Oomyzus sokolowskii (Hymenoptera: Eulophidae) and to predators Polybia scutellaris (Hymenoptera: Vespidae) and Lasiochilus sp. (Hemiptera: Anthocoridae). In bioassays, P. xylostella larvae and O. sokolowskii, P. scutellaris and Lasiochilus sp. adults were used. Concentration-mortality curves of six insecticides for P. xylostella were established. These curves were used to estimate the mortality of P. xylostella at the recommended concentration, in order to check a control failure of insecticides to this pest. Furthermore, the lethal concentration for 90% of populations (LC90) and the half of LC90 were used in bioassays with the natural enemies to determine the selectivity of these insects to insecticides. All tested insecticides showed control failure to P. xylostella, indicated by high LC90 and low estimated mortalities (less than 80%). The cartap insecticide was selective in half of LC90 to Lasiochilus sp. and moderately selective in LC90 and the half of LC90, to Lasiochilus sp. and P. scutellaris, respectively. Deltamethrin was moderately selective in the half of LC90 to predator Lasiochilus sp. Cartap, carbaryl, and deltamethrin reduced the mortality of Lasiochilus sp. in the half LC90. The results also showed that the insecticides methamidophos, carbaryl, parathion methyl and permethrin were not selective to any of the tested natural enemies. The role of insecticides in IPM systems of Brassica crops is discussed based on their control failures to P. xylostella and selectivity to their natural enemies.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new multiple objective dynamic routing method using implied costs
    Autorzy:
    Craveirinha, J.
    Martins, L.
    Antunes, C.H.
    Climaco, J.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/307698.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    dynamic routing
    multicriteria decision support systems
    traffic management
    Opis:
    There are advantages in considering the routing problem in integrated communication networks as a multiobjective shortest path problem, having in mind to grasp eventual conflicts and trade-offs among distinct objectives and quality of services (QoS) constraints. On the other hand the utilisation of dynamic routing methods in various types of networks is well known to have significant impact on network performance and cost, namely in overload and failure conditions. This paper presents the detailed formulation of a proposal of a multiple objective dynamic routing method (MODR) of periodic state dependent routing type, enabling to represent distinct QoS related metrics and requirements in a consistent manner. The MODR method present formulation is based on a multiple objective shortest path model with constraints and is prepared to use implied costs as one of the metrics. Alternative paths tor each traffic flow are changed as a function of periodic updates of certain QoS related parameters estimated from real time measurements on the routes and trunks of the network. Such paths are computed by a specialised and efficient variant of a bi-objective shortest path constrained algorithm, developed for the MODR, enabling to incorporate flexible requirements on the QoS metrics. The architecture of the routing system is discussed together with the features of its main modules. An illustrative example of application of the MODR path calculation module to a circuit-switched type network using blocking probability and implied cost as metrics, is also presented, considering different overload conditions.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 3; 50-59
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen
    Autorzy:
    Martins Jr, J. R. S.
    Araújo, R. O.
    Nogueira, R. A.
    Grandini, C. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/351840.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical spectroscopy
    anelasticity
    internal friction
    Ti-Mo alloys
    interstitials
    biomaterials
    Opis:
    Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 25-30
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Traffic splitting in MPLS networks - a hierarchical multicriteria approach
    Autorzy:
    Craveirinha, J. M. F.
    Cli'maco, J. C. N.
    Pascoal, M. M. B.
    Martins, L. M. R. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/308582.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    multicriterial optimization
    multicriteria shortest paths
    routing telecommunication networks
    Internet/MPLS
    Opis:
    In this paper we address a new hierarchical multicriteria routing model associated with a two-path traffic splitting routing method in MPLS networks whereby the bandwidth required by a given node-to-node traffic flow is divided by two disjoint paths. The model has two levels of objective functions and several constraints. An algorithmic approach is presented for calculating non-dominated solutions and selecting good compromise solutions to this problem. Also a number of computational experiments are presented.
    Źródło:
    Journal of Telecommunications and Information Technology; 2007, 4; 3-10
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tailings reprocessing from Cabeco do Piao dam in Central Portugal: a kinetic approach of experimental data
    Autorzy:
    Figueiredo, J.
    Vila, M. C.
    Matos, K.
    Martins, D.
    Futuro, A.
    de Lurdes Dinis, M.
    Góis, J.
    Leite, A.
    Fiúza, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/92190.pdf
    Data publikacji:
    2018
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    tailings
    multi-criteria optimization
    reprocessing
    zinc
    tungsten
    odpadki
    optymalizacja wielokryterialna
    utylizacja
    cynk
    wolfram
    Opis:
    The mining waste and tailing dam are object of discussion due to the accidents that occur due to a lack of control or due to interest in the remaining minerals present in these materials. Most of the old tailings dams have high contents of heavy metals which could represent potential risks to the environment or be an alternative source of some critical raw materials. The case study of the Cabeco do Piao dam in Central Portugal involved tailings from a processing plant that belonged to the Panasqueira Mine Complex, which has been in operation for over 120 years. Waste rock and mining tailings were deposited in the area until 1995, and they represent an environmental liability for the local population due to their high content of toxic metals. Tailings reprocessing can be considered as a solution that minimizes social and environmental impacts, recovers some essential minerals, such as Zn, W, and Cu which can help to offset investments made. The project design involves several stages of metal concentration, determined by experiments, as well as a model of the process. The overall model will take into account technological constraints, social-economic conditions and environmental impacts. A preliminary result of an optimization study of the kinetic approach is presented in this piece of work.
    Źródło:
    Journal of Sustainable Mining; 2018, 17, 3; 139-144
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques
    Autorzy:
    Martins, J. F. T.
    Costa, F. E.
    dos Santos, R. A.
    de Mesquita, C. H.
    Hamada, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146916.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal growth
    iodide mercury crystal
    physical vapor transport (PVT)
    radiation detector
    semiconductor crystal
    Opis:
    In this work, the establishment of a technology for HgI2 purification and crystal growth is described, aiming at a future application of this crystal as a room temperature radiation semiconductor detector. Two methods of crystal growth were studied in the development of this work: (1) physical vapor transport (PVT) and (2) saturated solution from dimethylsulphoxide (DMSO) complexes. In order to evaluate the crystals obtained using each of these methods, systematic measurements were carried out for determining the stoichiometry, structure, orientation, surface morphology and impurity of the crystal. The influence of these physicochemical properties of the crystals developed was evaluated in terms of their performance as a radiation detector. The best response to radiation was found for the crystals grown by the PVT technique. Significant improvement in the performance of HgI2 radiation detector was found, purifying the crystal by means of two successive growths by the PVT technique.
    Źródło:
    Nukleonika; 2012, 57, 4; 555-562
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-ray computed tomography SCANNERS for applications in multiphase system COLUMNs
    Autorzy:
    Calvo, W. A. P.
    Hamada, M. M.
    Sprenger, F. E.
    Vasquez, P. A. S.
    Rela, P. R.
    Martins, J. F. T.
    de Matos Pereira, J. C. S.
    Omi, N.
    de Mesquita, C. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/148082.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    industrial computed tomography
    multiphase flow systems
    non-destructive testing
    gas absorption column
    industrial process optimization
    packed distillation columns
    scanning systems
    Opis:
    Gamma-ray tomography experiments have been carried out to detect spatial patterns in the porosity, in a 0.27 m diameter packed steel column using a first generation computed tomography (CT) system. The CT scanner consists of a NaI(Tl) detector 5.08 cm in diameter, and an encapsulated 137Cs (3.7 GBq) radioactive source, located opposite to the center of the detector. The detector and the source, mounted on a fixed support and the column, can rotated and dislocate by two stepping motors controlled through a microprocessor. Different sizes of stainless steel Raschig rings (12.6, 37.9 and 76 mm) have been examined. The primary objective of this work is to detect spatial patterns and statistical information on porosity variation in packed distillation columns. Horizontal scans, at different vertical positions of the packed bed were made for each size of Raschig rings. Radial porosity variation within the packed bed has been determined. This study has demonstrated that the porosity and its spatial distribution in a metallic packed column can be measured with adequate spatial resolution using the gamma-ray tomography technique. After validation of this first generation CT, the turntable design to rotate and dislocate the 60Co or 137Cs sealed gamma-ray sources and multidetector array for the third generation industrial computed tomography was also developed.
    Źródło:
    Nukleonika; 2009, 54, 2; 129-133
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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