Search Results - (Author, Cooperation:J. Barroso)

Showing 1 - 20 results of 28, query time: 0.23s Refine Results
  1. 1
    R. J. Brienen ; O. L. Phillips ; T. R. Feldpausch ; E. Gloor ; T. R. Baker ; J. Lloyd ; G. Lopez-Gonzalez ; A. Monteagudo-Mendoza ; Y. Malhi ; S. L. Lewis ; R. Vasquez Martinez ; M. Alexiades ; E. Alvarez Davila ; P. Alvarez-Loayza ; A. Andrade ; L. E. Aragao ; A. Araujo-Murakami ; E. J. Arets ; L. Arroyo ; C. G. Aymard ; O. S. Banki ; C. Baraloto ; J. Barroso ; D. Bonal ; R. G. Boot ; J. L. Camargo ; C. V. Castilho ; V. Chama ; K. J. Chao ; J. Chave ; J. A. Comiskey ; F. Cornejo Valverde ; L. da Costa ; E. A. de Oliveira ; A. Di Fiore ; T. L. Erwin ; S. Fauset ; M. Forsthofer ; D. R. Galbraith ; E. S. Grahame ; N. Groot ; B. Herault ; N. Higuchi ; E. N. Honorio Coronado ; H. Keeling ; T. J. Killeen ; W. F. Laurance ; S. Laurance ; J. Licona ; W. E. Magnussen ; B. S. Marimon ; B. H. Marimon-Junior ; C. Mendoza ; D. A. Neill ; E. M. Nogueira ; P. Nunez ; N. C. Pallqui Camacho ; A. Parada ; G. Pardo-Molina ; J. Peacock ; M. Pena-Claros ; G. C. Pickavance ; N. C. Pitman ; L. Poorter ; A. Prieto ; C. A. Quesada ; F. Ramirez ; H. Ramirez-Angulo ; Z. Restrepo ; A. Roopsind ; A. Rudas ; R. P. Salomao ; M. Schwarz ; N. Silva ; J. E. Silva-Espejo ; M. Silveira ; J. Stropp ; J. Talbot ; H. ter Steege ; J. Teran-Aguilar ; J. Terborgh ; R. Thomas-Caesar ; M. Toledo ; M. Torello-Raventos ; R. K. Umetsu ; G. M. van der Heijden ; P. van der Hout ; I. C. Guimaraes Vieira ; S. A. Vieira ; E. Vilanova ; V. A. Vos ; R. J. Zagt
    Nature Publishing Group (NPG)
    Published 2015
    Staff View
    Publication Date:
    2015-03-20
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Atmosphere/chemistry ; Biomass ; Brazil ; Carbon/analysis/metabolism ; Carbon Dioxide/*analysis/metabolism ; *Carbon Sequestration ; Plant Stems/metabolism ; *Rainforest ; Trees/growth & development/metabolism ; Tropical Climate ; Wood/analysis
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Pinna F, Falcón-Barroso J, Martig M, et al.
    Oxford University Press
    Published 2018
    Staff View
    Publication Date:
    2018-03-06
    Publisher:
    Oxford University Press
    Print ISSN:
    0035-8711
    Electronic ISSN:
    1365-2966
    Topics:
    Physics
    Published by:
    http://global.oup.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Kostov, K. G. ; Barroso, J. J.

    [S.l.] : American Institute of Physics (AIP)
    Published 2002
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    In the present paper we extend to two dimensions the classical Langmuir–Blodgett law, which determines the maximum current ILB that can be accelerated by a given voltage across two infinitely long coaxial cylinders. Generalization of the ILB law is established by performing two-dimensional 2D particle-in-cell numerical experiments on a variety of cylindrical diode configurations with a finite-length emitter. It is found that the limiting current in two dimensions I2D follows a monotonically decreasing function of the emitter length-to-outer electrode radius ratio L/R as expressed by the fitting function I2D/ILB=1+0.1536/(L/R)+0.0183/(L/R)2 within 2.5% accuracy for simulation data in which the ratio of the outer to inner radii exceeds 3. © 2002 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1446876

    Articles: DFG German National Licenses
  4. 4
    Sandonato, G. M. ; Barroso, J. J.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    Conceptual modeling of the multiaperture electrode system of a 5-cm-diam ring cusp ion thruster intended for producing a 1 mN thrust is described. A mathematical treatment of the ion extraction from the plasma has been developed to provide a method for calculating both the shape and potential of the plasma-emitting surface. The ion optics of the electrode system have been examined using a numerical code to evaluate the ion beam divergence. Close agreement is achieved between the predictions of the conceptual modeling presented here and published experimental results. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1146880

    Articles: DFG German National Licenses
  5. 5
    BARROSO, J ; RUIZ, D ; FERNANDEZ-QUINTANILLA, C ; LEGUIZAMON, E S ; HERNAIZ, P ; RIBEIRO, A ; DIAZ, B ; MAXWELL, B D ; REW, L J

    Oxford, UK : Blackwell Science Ltd
    Published 2005
    Staff View
    ISSN:
    1365-3180
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    The ability to manage weed infestations in a spatially precise manner requires efficient and accurate methods of mapping weed distributions. A study was conducted to compare four different ground-based methods for collecting georeferenced information on infestations of Avena sterilis in winter wheat and barley. Sampling was performed at harvest by scoring panicle density, either from the ground or from a combine, by counting the number of panicle contacts with a stick moved horizontally over the crop canopy by an observer walking through the field, and by sampling A. sterilis seed rain on the ground. No significant differences were observed among the populations estimated by the four methods. A partial budget analysis of the in-season costs and benefits of spraying patches using these methods showed that visual scoring from the combine was the most appropriate method for the creation of weed management maps to be used for patch spraying in the following season. As a large variety of spatial patterns may be found in fields, the recommended sampling method might be field-specific and optimality should be verified for general use.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-3180.2005.00451.x

    Articles: DFG German National Licenses
  6. 6
    LEGUIZAMÓN, E S ; FERNANDEZ-QUINTANILLA, C ; BARROSO, J ; GONZALEZ-ANDUJAR, J L

    Oxford, UK : Blackwell Science Ltd
    Published 2005
    Staff View
    ISSN:
    1365-3180
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Historical records on the field emergence of seedlings of Avena sterilis in winter cereal crops were used to develop thermal/hydrothermal models to predict the emergence of this weed as a function of meteorological conditions. When water was not a limiting factor, a Weibull function provided a good description of the relationship between thermal time and seedling emergence. The variability in the rate of seedling emergence observed under these conditions was associated with variation in the differential between measured and base temperatures. When water was limiting in the soil, the rate of seedling emergence was reduced, a different function was required to describe the process. The use of a hydrothermal model enabled the use of a single function to describe the patterns of seedling emergence of the nine site-years considered in the study. Using this model we can conclude that 70% seedling emergence will be reached, under very diverse conditions, within 300 hydrodegree days. The hydrothermal model proposed was validated with independent seedling emergence data, supporting the idea that this model is robust enough to be used as a predictive tool for seedling emergence of A. sterilis in a variety of conditions.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-3180.2004.00444.x

    Articles: DFG German National Licenses
  7. 7
    Barroso, J ; Fernàndez-Quintanilla, C ; Ruiz, D ; Hernaiz, P ; Rew, LJ

    Oxford, UK : Blackwell Science Ltd
    Published 2004
    Staff View
    ISSN:
    1365-3180
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Long-term experiments were conducted in two winter barley fields in central Spain to determine the spatial stability of Avena sterilis ssp. ludoviciana populations under annual applications of low rates of imazamethabenz herbicide. Weed density was sampled every year (over 5 years in the first field and over 3 years in the second) on the same grid locations prior to herbicide application. Although weed patches were stable in their location, weed density decreased in most of the years. In the first field, the populations decreased exponentially over the 5-year period. The rates of population decline were dependent on the initial density of the population, being higher for the central core of the patches and lower for the low-density areas. Under the conditions present in this experiment, it was possible to reduce heavy weed patches (up to 1200 seedlings m−2) down to relatively safe levels (18 seedlings m−2) in a period of 3 years using a density-specific control programme, applying low rates of herbicides when weed densities were below a given level (1000 seedlings m−2). However, under adverse environmental conditions, half rates of the herbicide failed to control the weed populations adequately. The stability of the location of patches of A. sterilis ssp. ludoviciana suggest that weed seedling distributions mapped in one year are good predictors of future seedling distributions. However, the actual densities established each year will depend on the control level achieved the previous year and the climatic conditions present during the establishment period.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-3180.2004.00389.x

    Articles: DFG German National Licenses
  8. 8
    Barroso, J ; Fernandez-Quintanilla, C ; Maxwell, B D ; Rew, L J

    Oxford, UK : Blackwell Science Ltd
    Published 2004
    Staff View
    ISSN:
    1365-3180
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    The economic benefits of using site-specific weed management (SSWM) are related to the proportion of the field that is weed-infested, the number of weed patches and the spatial resolution of sampling and spraying technologies. In this paper we simulate different combinations of these factors using parameter values obtained for Avena sterilis ssp. ludoviciana growing in Spanish winter barley crops. The profitability of SSWM systems increased as the proportion of the field infested by this weed decreased and when patch distribution was more concentrated. Under most of the conditions tested, positive net returns for SSWM were obtained when the weed-infested area was smaller than 30%. The highest net return occurred using a 12 m × 12 m mapping and spraying resolution. The critical parameter that determined the economic viability of patch mapping and spraying resolution was the technology costs. The site specific strategy was economically superior to the standard strategy (overall herbicide application) in most cases. However, the differential between the two strategies decreased when the number of patches and the resolution of mapping and spraying increased, such that the highest net returns were obtained with a single patch covering 14% of the field and using a 12-m mapping and spraying resolution; whereas the worst net returns were obtained for all patch numbers when 64% of the field was infested and a 3-m mapping and spraying resolution was used.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-3180.2004.00423.x

    Articles: DFG German National Licenses
  9. 9
    Altshuler, E. ; Garcia, S. ; Barroso, J.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)90297-C

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    0028-3932
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Psychology
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0028-3932(90)90053-Q

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    0006-291X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0006-291X(65)90403-1

    Articles: DFG German National Licenses
  12. 12
    Hernandez, S. ; Nieto, A. ; Barroso, J.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0278-2626
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Medicine
    Psychology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0278-2626(92)90029-L

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    0304-4238
    Keywords:
    In vitro propagation ; Ophrys spp ; minitubers production ; terrestrial orchids
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0304-4238(90)90056-K

    Articles: DFG German National Licenses
  14. 14
    Spassov, V.A. ; Barroso, J. ; Ueda, M. ; Guerguiev, L.
    Springer
    Published 1997
    Staff View
    ISSN:
    1572-946X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The design and construction of a compact high-voltage pulse generator for providing input electron beam power for the LAP/INPE 32 GHz gyrotron and for treatment of metal and polymer materials by plasma immersion ion implantation (PIII) are described. The generator was built on a circuit category of Pulse Forming Network (PFN), consisting of nine LC sections with L = 270 μH and C = 2.5 nF. The instrument was designed to produce a flat 30 kV, several Amps pulse in 15 μs pulse length with pulse repetition frequency (PRF) of 8 to 100 Hz. By means of a resonant charging inductance it is possible to gain an output voltage with a factor of 1.8 higher than the voltage supplied by the pulse generator. The generator is fed with sine-wave, constant current source, and a 60 kV, 15 mA switching power supply.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1001123221816

    Articles: DFG German National Licenses
  15. 15
    Costela, A. ; García-Moreno, I. ; Barroso, J. ; Sastre, R.
    Springer
    Published 1998
    Staff View
    ISSN:
    1432-0649
    Keywords:
    PACS: 42.55Rz; 42.55Mv; 42.70Hj; 42.70Jk
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s003400050489

    Articles: DFG German National Licenses
  16. 16
    Costela, A. ; García-Moreno, I. ; Barroso, J. ; Sastre, R.
    Springer
    Published 2000
    Staff View
    ISSN:
    1432-0649
    Keywords:
    PACS: 42.55Mv; 42.55Rz; 42.70Hj; 42.70Jk
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract. Laser performance of pyrromethene 567 (PM567) dye dissolved in pure poly(methyl methacrylate) homopolymer and its copolymers with 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 1-vinyl-2-pyrrolidone, 2-phenoxyethyl acrylate, and 2,2,2-trifluoromethyl methacrylate has been investigated. The chosen monomers were selected to mimic solvents used in a previous study on the photophysical and lasing properties of PM567 in liquid solution in order to establish correlations between the lasing properties of PM567 in liquid and solid solutions. The vol/vol proportion of the different comonomers in each copolymer formulation was systematically varied, and the effect of each composition on the lasing properties of PM567 was evaluated. The laser samples were transversely pumped at 534 nm with 5.5-mJ pulses from a frequency-doubled Q-switched Nd:KGW laser. Lasing efficiencies of up to 30% and good photostabilities, with a drop of the initial laser output of 20% after 10000 pump pulses in some of the solid samples, were demonstrated.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s003400050059

    Articles: DFG German National Licenses
  17. 17
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] The 9 March 1994 occultation of Ch08 (GSC248-01674)9 by Chiron was successfully observed with two telescopes: the 0.9-m telescope aboard NASA's Kuiper Airborne Observatory (KAO) flying near Recife, Brazil and the 0.5-m telescope at the South African Astronomical Observatory (SAAO) at Sutherland. We ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/373046a0

    Articles: DFG German National Licenses
  18. 18
    Staff View
    ISSN:
    1420-908X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Abstract The intravenous injection of purified scorpion toxin (tityustoxin, TsTX) into unanesthetized rats induces a severe systemic hypertension followed by a hemorrhagic edema of the lungs. The edema is focal or diffuse, whereas the hemorrhage is always focal and less prominent than the edema. Anesthesia of the rats prevents the appearance of pulmonary edema. It seems likely that this protective action of the anesthesia is due, at least in part, to an interference with the hypertension induced by TsTX. The pulmonary edema is prevented by bilateral adrenalectomy, guanethidine or phenoxybenzamine. It is suggested that the edema depends on a sympathetic-adrenal discharge and that catecholamines released by TsTX act onalpha adrenergic receptors. The mean kininogen content of the rat plasma, 1 h after TsTX injection, is not significantly different from that found in the control animals. The possible role played by kinins and other mediators in the early phases of the pulmonary edema induced by TsTX is under investigation.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01972412

    Articles: DFG German National Licenses
  19. 19
    Castro, P. J. ; Barroso, J. J. ; Correa, R. A.
    Springer
    Published 1993
    Staff View
    ISSN:
    1572-9559
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A study of selective properties of coaxial open cylindrical resonators have been conducted experimentally and compared with theory. The resonator consists of an inner circular cylinder symmetrically located inside an outer weakly irregular open waveguide. Several fundamental TE modes were identified over the range 9 to 17 GHz through measurements of the resonant frequencies and the associated loaded quality factors. It has been verified that the structure and the number of resonant modes are both strongly dependent on the diameter of the coaxial insert. Such an electrodynamical system proves to be useful in guided wave applications requiring, for example, filters, frequency-tunable resonators and devices for analyzing the modal composition of a signal.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02282080

    Articles: DFG German National Licenses
  20. 20
    Castro, P. J. ; Barroso, J. J. ; Correa, R. A.
    Springer
    Published 1993
    Staff View
    ISSN:
    1572-9559
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A study of ohmic selective properties of open coaxial cylindrical resonators has been conducted experimentally and compared with theory. The resonator consists of an inner cylinder made of silicon carbide symmetrically located inside an outer cylindrical, tube shaped waveguide. Several fundamental TE modes were identified over the range 9 to 17 GHz through measurements of the resonant frequencies and the associated quality factors. Mode discrimination is achieved both by exploring selective ohmic effects and examining the electrodynamical properties of the coaxial cylindrical waveguide. The effectiveness of a silicon carbide coaxial insert in providing ohmic mode selection is demonstrated in that the totalQ factors of TE mp modes with radial indexp≥2 become well below the quality factors for surface TE m1 modes. It has been verified that both structure and number of resonant modes are strongly dependent on the diameter and the resistivity of the coaxial insert.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02096381

    Articles: DFG German National Licenses