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Search Results: 1 - 10 of 225411 matches for " Viviane R.;Pasini "
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Preda??o de pupas de Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) por larvas e adultos de Calosoma granulatum Perty (Coleoptera: Carabidae) em laboratório
Chocorosqui, Viviane R.;Pasini, Amarildo;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000100008
Abstract: the predation capacity of larvae and adults of calosoma granulatum perty on alabama argillacea (hübner) pupae was studied under laboratory conditions. in the first experiment, each larva of c. granulatum (n=18) was provided with five pupae of a. argillacea per day; in the second experiment, five pupae per day were given to each c. granulatum adult (n= five males and five females). their predation rate was 1.8 pupae per day. the highest level of predation occurred from the end of the second instar to the beginning of the third instar. their predation rate for adults was 1.5 and 1.7 larvae per day, for males and females, respectively. there was no significant difference between male and female predation capacity in all evaluations. these results indicate that c. granulatum larvae and adults may prey on relatively high numbers of a. argillacea pupae, and therefore, the preservation of this predator on cultivated areas is essential to reduce the number of insecticide sprays and, consequently, the cost of production per hectare.
Energy-based predictions in Lorenz system by a unified formalism and neural network modelling
A. Pasini, R. Langone, F. Maimone,V. Pelino
Nonlinear Processes in Geophysics (NPG) , 2010,
Abstract: In the framework of a unified formalism for Kolmogorov-Lorenz systems, predictions of times of regime transitions in the classical Lorenz model can be successfully achieved by considering orbits characterised by energy or Casimir maxima. However, little uncertainties in the starting energy usually lead to high uncertainties in the return energy, so precluding the chance of accurate multi-step forecasts. In this paper, the problem of obtaining good forecasts of maximum return energy is faced by means of a neural network model. The results of its application show promising results.
A Multiscale Mechanical Model for Plant Tissue Stiffness
Tanvir R. Faisal,Alejandro D. Rey,Damiano Pasini
Polymers , 2013, DOI: 10.3390/polym5020730
Abstract: Plant petioles and stems are hierarchical cellular structures, displaying structuralfeatures defined at multiple length scales. The current work focuses on the multi-scalemodelling of plant tissue, considering two orders of structural hierarchy, cell wall and tissue.The stiffness of plant tissue is largely governed by the geometry of the tissue cells, thecomposition of the cell wall and the structural properties of its constituents. The cell wallis analogous to a fiber reinforced composite, where the cellulose microfibril (CMF) is theload bearing component. For multilayered cell wall, the microfibril angle (MFA) in themiddle layer of the secondary cell wall (S2 layer) largely affects the longitudinal stiffnessfor values up to 40o. The MFA in turn influences the overall wall stiffness. In this work,the effective stiffness of a model system based on collenchyma cell wall of a dicotyledonousplant, the Rheum rhabarbarum, is computed considering generic MFA and volume fractions.At the cellular level, a 2-D Finite Edge Centroidal Voronoi tessellation (FECVT) has beendeveloped and implemented to generate the non-periodic microstructure of the plant tissue.The effective elastic properties of the cellular tissue are obtained through finite elementanalysis (FEA) of the Voronoi model coupled with the cell wall properties. The stiffness ofthe hierarchically modeled tissue is critically important in determining the overall structuralproperties of plant petioles and stems.
Beam Dynamics Studies for the HIE-ISOLDE Linac at CERN
M. A. Fraser,M. Pasini,R. M. Jones,M. Lindroos
Physics , 2009,
Abstract: The upgrade of the normal conducting (NC) Radioactive Ion Beam EXperiment (REX)-ISOLDE heavy ion accelerator at CERN, under the High Intensity and Energy (HIE)-ISOLDE framework, proposes the use of superconducting (SC) quarter-wave resonators (QWRs) to increase the energy capability of the facility from 3 MeV/u to beyond 10 MeV/u. A beam dynamics study of a lattice design comprising SC QWRs and SC solenoids has confirmed the design's ability to accelerate ions, with a mass-to-charge ratio in the range 2.5 < A/q < 4.5, to the target energy with a minimal emittance increase. We report on the development of this study to include the implementation of realistic fields within the QWRs and solenoids. A preliminary error study is presented in order to constrain tolerances on the manufacturing and alignment of the linac.
Beam Dynamics Investigation of the 101.28 MHz IH Structure as Injector for the HIE-ISOLDE SC Linac
M. A. Fraser,M. Pasini,R. M. Jones,D. Voulot
Physics , 2010,
Abstract: The first phase of the HIE-ISOLDE project at CERN consists of a superconducting (SC) linac upgrade in order to increase the energy of post-accelerated radioactive ion beams from 2.8 MeV/u to over 10 MeV/u (for A/q = 4.5). In preparation for the upgrade, we present beam dynamics studies of the booster section of the normal conducting (NC) REX-ISOLDE linac, focused on the longitudinal development of the beam in the 101.28 MHz Interdigital H-mode Structure (IHS), employing a Combined Zero Degree Structure (KONUS), pulsing at a high gradient of over 3 MV/m. The evolution of the transverse emittance in the SC linac depends critically on the injected longitudinal phase space distribution of particles from the existing linac and, with a better understanding of the beam dynamics upstream, the performance of the upgrade can be optimised. Data taken during the commissioning phase of the REX-ISOLDE linac is analysed to understand the properties of the beam in the booster and combined with beam dynamics simulations which include the realistic fields of the IHS, determined from both simulation and perturbation measurement.
Hie-Isolde High Beta Cavity Study and Measurements
A. D'Elia,R. M. Jones,M. Pasini
Physics , 2009,
Abstract: The upgrade of the ISOLDE machine at CERN foresees a superconducting linac based on two gap independently phased Nb sputtered Quarter Wave Resonators (QWRs) working at 101.28MHz and producing an accelerating field of 6MV/m on axis. A careful study of the fields in the cavity has been carried out in order to pin down the crucial e-m parameters of the structure such as peak fields, quality factor and e-m power dissipated on the cavity wall. A tuning system with about 200kHz frequency range has been developed in order to cope with fabrication tolerances. In this paper we will report on the cavity simulations. The tuning plate design will be described. Finally the frequency measurements on a cavity prototype at room temperature will be presented.
Beam Dynamics Studies of the REX-ISOLDE Linac in Preparation for its Role as Injector for the HIE-ISOLDE SC Linac at CERN
M. A. Fraser,M. Pasini,R. M. Jones,D. Voulot
Physics , 2010,
Abstract: The superconducting (SC) High Intensity and Energy (HIE) ISOLDE linac will replace most of the existing accelerating infrastructure of the Radioactive ion beam EXperiment (REX) at CERN, however, the 101.28 MHz RFQ and 5 MV IH cavity will remain in the role of injector for the upgrade, boosting the beam up to an energy of 1.2 MeV/u. We present the results of a beam dynamics investigation of the injector focused most critically on matching the longitudinal beam parameters from the RFQ to the SC machine, which is complicated largely by the IH cavity employing a Combined Zero Degree (KONUS) beam dynamics design. The longitudinal beam parameters at the RFQ are reconstructed from measurement using the three gradient method and combined with beam dynamics measurements and simulations of the IH structure to design the matching section for the SC linac.
株间距离对蜂巢式选择效率的作用
R.J.Pasini,李宗智
麦类作物学报 , 1991, DOI: 10.7606/j.issn.1009-1041.1991.03.040
Abstract: 在两个株间距离(d=100cm,低密度,代表无株间竞争条件和d=15cm,高密度,代表有株间竞争条件)下观察了蜂巢式选择程序对选择优良基因型的效果。通过对经过选择的单株后代和未加选择的随机单株后代小区产量的比较,评定了竞争和无竞争条件下单株选择的进展。观察了选择强度和选择效应之间的关系,发现单株竞争力和小区产量之间可能呈负相关。单株选择究竟应在竞争条件下进行,还是在无竞争条件下进行,迄今尚无定论。发现在这两种密度下单株产量和小区产量之间均无显著相关。然而,在低密度下产量选择效应较高,支持了Fasoulas在无竞争条件下选单株的主张。应用这个结果一定要慎重,因为种子质量和随机植株的取样偏差对选择效应会产生重要影响。
Sexo para quase todos: a prostitui??o feminina na Vila Mimosa
Pasini, Elisiane;
Cadernos Pagu , 2005, DOI: 10.1590/S0104-83332005000200008
Abstract: this article is based on ethnographic research conducted in an old zone of closed female prostitution in rio de janeiro - vila mimosa. i argue that the spaces created for the consumption of local sex are being used also for encounters between local sex laborers and foreigners. the discussion rises the question that this macrospace of female prostitution is becoming a stage for conflict when it becomes also a sex market used by foreigners.
Making a reality of social and health care integration: lessons from the Italian peninsula
Paolo Pasini
International Journal of Integrated Care , 2011,
Abstract:
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