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  • 1
    Electronic Resource
    Electronic Resource
    Operation of a quasi-optical gyrotron with a Gaussian output coupler (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3492-3500 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The operation of a 92 GHz quasi-optical gyrotron having a resonator formed by a spherical mirror and a diffraction grating placed in −1 order Littrow mount is presented. A power of 150 kW with a Gaussian output pattern was measured. The Gaussian content in the output was 98% with less than 1% of depolarization. By optimizing the magnetic field at fixed frequency, a maximum efficiency of 15% was reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871499
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  • 2
    Electronic Resource
    Electronic Resource
    Negative coronas: Low current mode – pulse mode transition (1999)
    Springer
    Czechoslovak journal of physics 49 (1999), S. 217-224 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the paper the results of experimental study of negative corona in a point – plane gap in a dust-free air flow at atmospheric pressure are presented. Both the low current mode (LCM) of the discharge and Trichel pulses are externally triggered by UV light. Close to the inception voltage of Trichel pulses short-duration current spikes appear besides the steady component of the LCM which indicates to the switch-on of Fowler-Nordheim type emission mechanism. At the inception voltage spike – Trichel pulse transition is recorded. The influence of dielectric layers at the cathode on the discharge parameters is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022854028712
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  • 3
    Electronic Resource
    Electronic Resource
    127Ce levels populated in the 4.2 s127Pr beta-decay (1995)
    Springer
    The European physical journal 351 (1995), S. 361-362 
    Details
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From new measurements, a half-live of 4.2±0.3 s has been clearly established in127Pr. This value confirms our first result [4] and rules out other data [5]. The127Pr activity was produced by bombarding92Mo or94Mo targets with 210 MeV40Ca beams. The mass identification has been made using an ion-guide coupled with an on-line isotope separator. The partial level scheme proposed for127Ce has been deduced from β-gated γ spectra and Xγ- and γγ-coincidences. A new band structure based on a 1/2+ state is established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291139
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation of prolate-oblate shape-coexistence in 74Kr (1999)
    Springer
    The European physical journal 4 (1999), S. 103-105 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.10.Tg Lifetimes – 23.20.Lv Gamma transitions and level energies – 23.20.Nx Internal conversion and extranuclear effects – 25.70.Gh Compound nucleus – 27.50.+e 59 A 89
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The atomic nucleus 74Kr has been investigated using combined conversion-electron (CE) and γ-ray spectroscopy. In order to confirm the existence of the expected low-lying isomeric 0+ 2 state, the possibility of an electric-monopole (E0) decay to the ground state was examined. The observation of an E0 transition at 508 keV allowed the determination of the mixing between coexisting prolate and oblate shapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050209
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of alfalfa (Medicago sativa L.) intercropping and polyethylene mulching on early growth of walnut (Juglans spp.) in central Italy (1995)
    Springer
    Agroforestry systems 31 (1995), S. 169-180 
    Details
    ISSN: 1572-9680
    Keywords: competition ; forage species ; growth analysis ; intercropping ; polyethylene mulching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Combined production of timber and forage species is considered to be a desirable land-use system to offset some of the current land management problems of Italy. This paper reports the early results of a study on intercropping young plants of walnut with alfalfa (Medicago sativa L.), with or without polyethylene mulching, in an experimental plantation in central Italy. Two genotypes of walnut were used:Juglans regia L. and the French hybrid NG23×RA. The seasonal changes of absolute and relative growth rates of walnut stem diameter and apical shoot length were investigated. During both growing seasons, alfalfa intercropping strongly decreased walnut growth, whereas polyethylene mulching promoted stem height and diameter growth. Stem growth of intercropped-and-mulched walnut was the same as that of sole walnut under clean cultivation management. The use of polyethylene mulching reduced or avoided the competitive effect of associated alfalfa on walnut growth. During both growing seasons, the intercropped-and-mulched walnut had higher relative growth rates than intercropped-unmulched walnut. The results show the effectiveness of polyethylene mulching in promoting early growth of walnut, even when intercropped with alfalfa during early stages of plantation establishment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00711724
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  • 6
    Electronic Resource
    Electronic Resource
    Soil physical characteristics and understory management in a walnut (Juglans regia L.) plantation in central Italy (1999)
    Springer
    Agroforestry systems 46 (1999), S. 95-105 
    Details
    ISSN: 1572-9680
    Keywords: alfalfa intercropping ; available water ; polyethylene mulching ; pore shape ; pore size distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Early and significant influences on soil physical properties are expected in temperate agroforests as a consequence of various soil and/or understory management practises. Soil physical characteristics were studied in an agroforestry trial of common walnut (Juglans regia L.) set up on a volcanic soil in central Italy, where clean cultivation, polyethylene mulching along tree rows and intercropping of walnut with alfalfa (Medicago sativa L.) were tested. Soil total porosity, size distribution and morphology of pores, and available water were evaluated during the second and the fourth growing season of the plantation to determine the possible influence and duration of the treatments on soil physical properties. In the first sampling the total porosity was two to three times greater than in the second one and no significant differences were found between treatments. Seasonal variation in total porosity was observed, with a maximum in summer. All dimensional classes of pores 〉 50 μm were well represented, thus indicating an adequate soil structure. In the fourth growing season total porosity and pore size distribution were very similar in clean cultivation and mulching so that the mulching effect on the structural characteristics of this soil was equivalent to that of repeated rototilling in clean-cultivated plots. Moreover, mulching stimulated more biological activity, resulting in a higher proportion of rounded pores. Alfalfa roots created a more homogeneous environment to a depth of 35 cm, with a greater presence of elongated pores in the range 50--500 μm that could make movement of water easier. Most of the water retained was unavailable for plants, so that competition between walnuts and alfalfa took place and could be associated with the lower stem growth of intercropped walnuts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006200310884
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  • 7
    Electronic Resource
    Electronic Resource
    Leaf-water potential and soil-water depletion of walnut mulched with polyethylene and intercropped with alfalfa in Central Italy (1998)
    Springer
    Agroforestry systems 40 (1998), S. 69-81 
    Details
    ISSN: 1572-9680
    Keywords: competition ; leaf water potential ; plantation forestry ; soil moisture ; timber species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In Italy, new agroforestry cultural models could play an important role in the diffusion of plantation forestry timber species. We studied the stem growth rates and leaf water potentials (Ψ) of common walnut (Juglans regia L.), and gravimetric soil moisture (θDW) depletion during the third and fourth growing seasons in an agroforestry trial in central Italy. Since the establishment of experimental plots in 1992, walnut was intercropped with alfalfa (Medicago sativa L.), with or without polyethylene (PE) mulching along tree rows. By the end of the study period, the unmulched-intercropped walnut was almost 68% smaller in stem diameter and height than the sole-unmulched control, demonstrating walnut’s sensitivity to alfalfa competition. The competitive effect of alfalfa on walnut stem growth was effectively controlled/reduced by PE mulching. Stem growth rates of mulched-intercropped walnut were always lower than the control, but much higher (ca. 235% in stem diameter and height) than those of unmulched-intercropped walnut. The higher field performance of mulched-intercropped walnut compared to the un- mulched-intercropped treatment was associated with higher soil moisture and predawn and midday Ψ values during the summer’s driest periods. The presence of PE mulching was also associated with lower levels of soil moisture during the early and late growing season, but this did not negatively affect walnut Ψ and growth rates. These results suggest that in the climatic conditions of central Italy, competition for soil moisture between young common walnut trees and alfalfa can be substantially lowered, but not completely eliminated, by PE mulching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006079215567
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  • 8
    Electronic Resource
    Electronic Resource
    Phase-stepped deflectometry applied to shape measurement of bent plates (1999)
    Springer
    Experimental mechanics 39 (1999), S. 66-70 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes an optical method based on deflectometry to measure the slope fields on the whole surface of a plate specimen under bending testing. The phase-stepping procedure used provides an excellent sensitivity on the slope measurement, which was measured and found to be better than 2.5×10−5 rad. Experimental results are presented along with finite element simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02329303
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