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  • 1
    Electronic Resource
    Electronic Resource
    Laurel forests in Tenerife, Canary Islands (1996)
    Springer
    Trees 11 (1996), S. 41-46 
    Details
    ISSN: 0931-1890
    Keywords: Key words Laurel forest ; Laurisilva ; Vertical leaf distribution ; Radial leaf distribution ; Allometric relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Branching pattern, leaf distribution (area, dry weight, number) and allometric relations on individual trees from a Canarian laurel forest have been analyzed. The following species were studied: Persea indica (L.) Spreng., Laurus azorica (Seub.) Franco, and Erica arborea L. Crown architecture was similar in all study species and corresponded to Rauhs’s model. In all species, leaf area was highly correlated to stem diameter. The vertical distribution of foliage was largely symmetrical and was roughly approximated by a Gaussian-like pattern which shifted upwards in dominant tree and downwards in suppressed tree. When radially viewed, most of the foliage area occurred roughly half the distance between the stem axis and the edge of the crown. However, radial leaf area indices, calculated for different areas of annulus around stems, showed a maximum closer to the stem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004680050055
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  • 2
    Electronic Resource
    Electronic Resource
    Laurel forests in Tenerife, Canary Islands (1996)
    Springer
    Trees 11 (1996), S. 34-40 
    Details
    ISSN: 0931-1890
    Keywords: Key words Laurel forest ; Laurisilva ; Stand structure ; Leaf area index ; Canopy structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Stand structure and leaf area distribution of a laurel forest in the Agua García mountains of Tenerife are described. The site is situated at 820 m a.s.l., faces NNE, and has a humid mediterranean climate. Summer droughts are mitigated by relatively high air humidity and clouds. The natural mixed hardwood forest is composed of six major tree species: Laurus azorica (Seub.) Franco, Persea indica (L.) Spreng, Myrica faya Ait., Erica arborea L. and two species of Ilex (I. platyphylla Webb & Berth. and I. canariensis Poivet.). The experimental stand had a density of 1693 trees ha – 1, a basal area of 33.7 m2ha – 1, and a cumulated volume of above-ground parts of trees of 231 m3 ha – 1 with a corresponding dry mass of 204 ton ha – 1. Diameters at breast height ranged from 6 to 46 cm. Mean concentration of plant dry mass per volume was 1.17 kg m – 3. The vertical pattern of leaf area distribution in individual trees for all tree species was characterized by a Gaussian-like curve. Stand leaf area index was 7.8. These evergreen, broad-leaved (laurisilva or lucidophyllous) forests represent a relic forest that was widespread in the Mediterranean region some 20 million years ago. Our data illustrate some of the structural characteristics of this historically widespread forest type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004680050055
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  • 3
    Electronic Resource
    Electronic Resource
    Pressure fluctuations in gas-fluidized beds at elevated temperatures (1983)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 22 (1983), S. 514-520 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i200022a029
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  • 4
    Electronic Resource
    Electronic Resource
    Sorption of sulfur dioxide by waste calcareous materials (1982)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 21 (1982), S. 530-532 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i200018a031
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  • 5
    Electronic Resource
    Electronic Resource
    Xylem water flow in a crack willow tree (Salix fragilis L.) in relation to diurnal changes of environment (1984)
    Springer
    Oecologia 64 (1984), S. 145-151 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The diurnal course of the xylem water flow in a solitary Salix fragilis L. tree in a wet grassland was measured using the tissue heat-balance method. There was considerable variation due to meteorological factors. Maximum flow rate was 0.4 kg h-1 m-2 of crown projection area, or 5.9 kg h-1 kg-1 leaf dry weight. The daily total was 2.4 kg m-2 day-1 or 36 kg kg-1 day-1. Water flow decreased immediately at the tree base and at the branches after start of rain, and in a branch, after cutting it off: the time constant of the system was 600–700 s in both cases. The part of the crown oriented to the sun transpired up to ten times as much as the shaded part. Over 70% of the total cross-sectional area of the conductive xylem vessels of the trunk was used by the transpiration flow. The water content of the trunk tracked the diurnal changes of the xylem water flow rate with a short time-lag. During the day, 1% of the trunk volume was temporarily exploited as water reserve, an amount equalling 3% of daily water loss. The stereometric configuration of the crown significantly influenced its water loss. During the summer period, about 33 mature (polycormic) trees per ha may drain 100% of water consumed by the present-day sedge-grass marsh.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376862
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  • 6
    Electronic Resource
    Electronic Resource
    Assessment of transpiration estimates for Picea abies trees during a growing season (1992)
    Springer
    Trees 6 (1992), S. 121-127 
    Details
    ISSN: 1432-2285
    Keywords: Heat balance method ; Canopy conductance ; Sap-flow rate ; Penman-Monteith equation ; Scaling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The tree-trunk heat balance method with internal heating and sensing of temperature was used to estimate sap-flow rate of spruce trees in a stand in southern Sweden. Sap-flow rate values were scaled up to stand transpiration and utilised for calculation of canopy conductance. The calculated values provided the basis for a function relating canopy conductance to vapour pressure deficit, which was implemented in the Penman-Monteith equation. The stand was mostly growing in non-limiting soil water conditions (irrigation regime applied during dry periods). The whole-season transpiration was assessed by two different approaches and then compared: the sap-flow rate measurements were scaled to stand transpiration and the adapted Penman-Monteith estimate. They gave similar results: the transpiration totals differed by 3% and the coefficient of determination of the linear regression was r2 = 0.89. Similarly good was the assessment for a set of rainy days. The Penman-Monteith estimate adapted in this way proved to be reasonably precise and reliable in this forest stand and usable even in wet conditions. The seasonal transpiration of the spruce stand was 392 mm according to the adapted Penman-Monteith equation. Mean daily transpiration was 1.8 mm and daily maximum transpiration was 4.8–4.9 mm as estimated by sap-flow rate measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202427
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  • 7
    Electronic Resource
    Electronic Resource
    An instrument for the resolution of the components of the doublet Kα1,α2 on X-ray diffraction photographs (1957)
    Springer
    Czechoslovak journal of physics 7 (1957), S. 756-756 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946606
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  • 8
    Electronic Resource
    Electronic Resource
    ПРИБОР ДЛЯ РАЗЛОЖЕНИ Я КОМПОНЕНТ Kα1, α2 ДУБЛЕТА НА РЕНТГ ЕНОВСКИХ ДИФФРАКЦИОННЫХ СНИМ КАХ (1957)
    Springer
    Czechoslovak journal of physics 7 (1957), S. 748-755 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Описан простой эИект рический моделирующ ий nрибор для разложен ия компонент Кα1, α2 дубле та на φотометрически х кривых, полученных из рентге нозских диφφракцион ных снимков или получ енчых при измерении счетчи ками Гейгера-Мюллера.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946605
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  • 9
    Electronic Resource
    Electronic Resource
    Asymptotic properties of differential equations with advanced argument (2000)
    Springer
    Czechoslovak mathematical journal 50 (2000), S. 825-837 
    Details
    ISSN: 1572-9141
    Keywords: functional differential equation ; functional (nondifferential) equation ; advanced argument ; asymptotic behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The paper discusses the asymptotic properties of solutions of the scalar functional differential equation $$y\prime \left( x \right) = ay\left( {{\tau }\left( x \right)} \right) + by\left( x \right), x \in \left[ {x_{0} ,\infty } \right)$$ of the advanced type. We show that, given a specific asymptotic behaviour, there is a (unique) solution y(x) which behaves in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022468713283
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  • 10
    Electronic Resource
    Electronic Resource
    Continuous transformations of differential equations with delays (1995)
    Springer
    Georgian mathematical journal 2 (1995), S. 1-8 
    Details
    ISSN: 1572-9176
    Keywords: 34K05 ; 34K15 ; Differential equation ; delay argument ; transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The aim of this paper is to find the class of continuous pointwise transformations (as general as possible) in the framework of which Kummer's transformationz(t)=g(t)y(h(t)) represents the most general pointwise transformation converting every linear homogeneous differential equation of thenth order into an equation of the same type. Further, some forms of these equations having certain subspaces of solutions are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257729
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