The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform

L. Juana - One of the best experts on this subject based on the ideXlab platform.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter.
    Biogeosciences, 2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance are also shown.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter
    2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance is also shown.

M. Gil - One of the best experts on this subject based on the ideXlab platform.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter.
    Biogeosciences, 2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance are also shown.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter
    2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance is also shown.

P Pinilla - One of the best experts on this subject based on the ideXlab platform.

  • ASTRONOMY & ASTROPHYSICS - Millimetre spectral indices of transition disks and their relation to the Cavity Radius
    Astronomy & Astrophysics, 2014
    Co-Authors: P Pinilla, M Benisty, T Birnstiel, Luca Ricci, Andrea Isella, A Natta, C P Dullemond, L. H. Quiroga-nuñez, Thomas Henning, Leonardo Testi
    Abstract:

    Context. Transition disks are protoplanetary disks with inner depleted dust cavities that are excellent candidates for investigating the dust evolution when there is a pressure bump. A pressure bump at the outer edge of the Cavity allows dust grains from the outer regions to stop their rapid inward migration towards the star and to efficiently grow to millimetre sizes. Dynamical interactions with planet(s) have been one of the most exciting theories to explain the clearing of the inner disk. Aims. We look for evidence of millimetre dust particles in transition disks by measuring their spectral index α_mm with new and available photometric data. We investigate the influence of the size of the dust depleted Cavity on the disk integrated millimetre spectral index. Methods. We present the 3-mm (100 GHz) photometric observations carried out with the Plateau de Bure Interferometer of four transition disks: LkHα 330, UX Tau A, LRLL 31, and LRLL 67. We used the available values of their fluxes at 345 GHz to calculate their spectral index, as well as the spectral index for a sample of twenty transition disks. We compared the observations with two kinds of models. In the first set of models, we considered coagulation and fragmentation of dust in a disk in which a Cavity is formed by a massive planet located at different positions. The second set of models assumes disks with truncated inner parts at different radii and with power-law dust-size distributions, where the maximum size of grains is calculated considering turbulence as the source of destructive collisions. Results. We show that the integrated spectral index is higher for transition disks (TD) than for regular protoplanetary disks (PD) with mean values of α^(TD)_(mm) = 2.70 ± 0.13 and α^(PD)_(mm) = 2.20 ± 0.07 respectively. For transition disks, the probability that the measured spectral index is positively correlated with the Cavity Radius is 95%. High angular resolution imaging of transition disks is needed to distinguish between the dust trapping scenario and the truncated disk case.

  • millimetre spectral indices of transition disks and their relation to the Cavity Radius
    Astronomy and Astrophysics, 2014
    Co-Authors: P Pinilla, M Benisty, T Birnstiel, Luca Ricci, Andrea Isella, A Natta, C P Dullemond, L H Quiroganunez
    Abstract:

    Context. Transition disks are protoplanetary disks with inner depleted dust cavities that are excellent candidates for investigating the dust evolution when there is a pressure bump. A pressure bump at the outer edge of the Cavity allows dust grains from the outer regions to stop their rapid inward migration towards the star and to efficiently grow to millimetre sizes. Dynamical interactions with planet(s) have been one of the most exciting theories to explain the clearing of the inner disk. Aims. We look for evidence of millimetre dust particles in transition disks by measuring their spectral index α_mm with new and available photometric data. We investigate the influence of the size of the dust depleted Cavity on the disk integrated millimetre spectral index. Methods. We present the 3-mm (100 GHz) photometric observations carried out with the Plateau de Bure Interferometer of four transition disks: LkHα 330, UX Tau A, LRLL 31, and LRLL 67. We used the available values of their fluxes at 345 GHz to calculate their spectral index, as well as the spectral index for a sample of twenty transition disks. We compared the observations with two kinds of models. In the first set of models, we considered coagulation and fragmentation of dust in a disk in which a Cavity is formed by a massive planet located at different positions. The second set of models assumes disks with truncated inner parts at different radii and with power-law dust-size distributions, where the maximum size of grains is calculated considering turbulence as the source of destructive collisions. Results. We show that the integrated spectral index is higher for transition disks (TD) than for regular protoplanetary disks (PD) with mean values of α^(TD)_(mm) = 2.70 ± 0.13 and α^(PD)_(mm) = 2.20 ± 0.07 respectively. For transition disks, the probability that the measured spectral index is positively correlated with the Cavity Radius is 95%. High angular resolution imaging of transition disks is needed to distinguish between the dust trapping scenario and the truncated disk case.

  • millimetre spectral indices of transition disks and their relation to the Cavity Radius
    arXiv: Earth and Planetary Astrophysics, 2014
    Co-Authors: P Pinilla, M Benisty, T Birnstiel, Luca Ricci, Andrea Isella, A Natta, C P Dullemond, L H Quiroganunez
    Abstract:

    Transition disks are protoplanetary disks with inner depleted dust cavities and excellent candidates to investigate the dust evolution under the existence of a pressure bump. A pressure bump at the outer edge of the Cavity allows dust grains from the outer regions to stop their rapid inward migration towards the star and efficiently grow to millimetre sizes. Dynamical interactions with planet(s) have been one of the most exciting theories to explain the clearing of the inner disk. We look for evidence of the presence of millimetre dust particles in transition disks by measuring their spectral index with new and available photometric data. We investigate the influence of the size of the dust depleted Cavity on the disk integrated millimetre spectral index. We present the 3mm photometric observations carried out with PdBI of four transition disks: LkHa330, UXTauA, LRLL31, and LRLL67. We use available values of their fluxes at 345GHz to calculate their spectral index, as well as the spectral index for a sample of twenty transition disks. We compare the observations with two kind of models. In the first set of models, we consider coagulation and fragmentation of dust in a disk in which a Cavity is formed by a massive planet located at different positions. The second set of models assumes disks with truncated inner parts at different Radius and with power-law dust size distributions, where the maximum size of grains is calculated considering turbulence as the source of destructive collisions. We show that the integrated spectral index is higher for transition disks than for regular protoplanetary disks. For transition disks, the probability that the measured spectral index is positively correlated with the Cavity Radius is 95%. High angular resolution imaging of transition disks is needed to distinguish between the dust trapping scenario and the truncated disk case.

R. Sánchez - One of the best experts on this subject based on the ideXlab platform.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter.
    Biogeosciences, 2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance are also shown.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter
    2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance is also shown.

L. Rodríguez-sinobas - One of the best experts on this subject based on the ideXlab platform.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter.
    Biogeosciences, 2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance are also shown.

  • Evolution of the spherical Cavity Radius generated around a subsurface drip emitter
    2010
    Co-Authors: M. Gil, L. Rodríguez-sinobas, R. Sánchez, L. Juana
    Abstract:

    Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical Cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the Cavity Radius. This pressure in the soil is very sensitive to the Cavity Radius. In this paper, the development of the Cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance is also shown.