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  • Articles  (35)
  • Springer  (35)
  • 1990-1994  (35)
  • Mathematics  (26)
  • Geography  (6)
  • Economics  (2)
  • Architecture, Civil Engineering, Surveying  (1)
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  • Articles  (35)
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  • 1
    Electronic Resource
    Electronic Resource
    Airborne pollen and spores of León (Spain) (1993)
    Springer
    International journal of biometeorology 37 (1993), S. 89-95 
    Details
    ISSN: 1432-1254
    Keywords: Airborne pollen ; Airborne spores ; Pollen diagrams ; Meteorological factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract A qualitative and quantitative analysis of airborne pollen and spores was carried out over 2 years (from September 1987 to August 1989) in the city of León. Slides were prepared daily using a volumetric pollen trap, which was placed on the Faculty of Veterinary Science building (University of León) 12m above ground-level. Fifty-one pollen types were observed; the most important of these were: Cupressaceae during the winter,Pinus andQuercus in spring, and Poaceae, Leguminosae and Chenopodiaceae in the summer. The results also showed the existence of a rich mould spore assemblage in the atmosphere. The group of Amerospores (Penicillium, Aspergillus andCladosporium) as well as Dictyospores (Alternaria) were the most abundant;Puccinia was common in the air in August. Fluctuations in the total pollen and spores m3 of air were compared with meteorological parameters (temperature, relative humidity and rainfall). From the daily sampling of the atmosphere of León, considering the maximum and minimum temperature and duration of rainfall, the start of the pollen grain season was observed generally to coincide with a rise in temperature in the absence of rain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01214387
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  • 2
    Electronic Resource
    Electronic Resource
    Matrix orthogonal Laurent polynomials and two-point Padé approximants (1992)
    Springer
    Numerical algorithms 3 (1992), S. 201-209 
    Details
    ISSN: 1572-9265
    Keywords: AMS 15 ; 41 ; Orthogonal polynomials ; Laurent polynomials ; T-fractions ; Padé approximants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract This paper is concerned with double sequencesC={C n} n =−∞/∞ of Hermitian matrices with complex entriesC n ∈M s×s ) and formal Laurent seriesL 0(z)=−Σ k=1 ∞ C −k z k andL ∞(z)=Σ k=0 ∞ C k z −k . Making use of a Favard-type theorem for certain sequences of matrix Laurent polynomials which was obtained previously in [1] we can establish the relation between the matrix counterpart of the so-calledT-fractions and matrix orthogonal Laurent polynomials. The connection with two-point Padé approximants to the pair (L 0,L ∞) is also exhibited proving that such approximants are Hermitian too. Finally, error formulas are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02141929
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  • 3
    Electronic Resource
    Electronic Resource
    On extrapolation of Jagerman and Stetter rules (1992)
    Springer
    Numerical algorithms 3 (1992), S. 211-222 
    Details
    ISSN: 1572-9265
    Keywords: Weight function ; integration rules ; extrapolation methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper quadrature rules introduced by Jagerman [1] and Stetter [2] are considered and asymptotic expansions for the error given. This allows to make use of the Romberg extrapolation process. Such rules can be viewed as generalizations of the well-known mid-point rule. Thus, numerical examples comparing these rules are finally presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02141930
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  • 4
    Electronic Resource
    Electronic Resource
    Duality and finite spaces (1990)
    Springer
    Order 6 (1990), S. 401-408 
    Details
    ISSN: 1572-9273
    Keywords: 55M05 ; 55N30 ; 06A10 ; Finite spaces ; sheaf cohomology ; dualizing complex ; geometric realization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Using that finite topological spaces are just finite orders, we develop a duality theory for sheaves of Abelian groups over finite spaces following closely Grothendieck's duality theory for coherent sheaves over proper schemes. Since the geometric realization of a finite space is a polyhedron, we relate this duality with the duality theory for Abelian sheaves over polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346134
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  • 5
    Electronic Resource
    Electronic Resource
    A pencil in with three points at the boundary (1992)
    Springer
    Geometriae dedicata 42 (1992), S. 255-265 
    Details
    ISSN: 1572-9168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We construct a linear pencilC t of curves in , such that for eacht ∈ ℙ1, Aut(C t) contains the alternating group $$\mathfrak{U}_5 $$ and we describe the curves of the pencil contained on the boundary of .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02414065
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  • 6
    Electronic Resource
    Electronic Resource
    Unicité dans ℝ n (1993)
    Springer
    Archiv der Mathematik 60 (1993), S. 345-348 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01207190
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  • 7
    Electronic Resource
    Electronic Resource
    When every polynomial is unconditionally converging (1994)
    Springer
    Archiv der Mathematik 63 (1994), S. 145-151 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189888
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  • 8
    Electronic Resource
    Electronic Resource
    Invariant differential operators and the range of the radonD-plane transform (1990)
    Springer
    Mathematische Annalen 287 (1990), S. 627-635 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01446918
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  • 9
    Electronic Resource
    Electronic Resource
    The 1987–88 Alaskan Bight tsunamis: Deep ocean data and model comparisons (1991)
    Springer
    Natural hazards 4 (1991), S. 119-139 
    Details
    ISSN: 1573-0840
    Keywords: Tsunamis ; ocean measurements ; model comparisons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Excellent deep ocean records have been obtained of two tsunamis recently generated in the Alaskan Bight on 30 November 1987 and 6 March 1988, providing the best available data set to date for comparison with tsunami generation/propagation models. Simulations have been performed with SWAN, a nonlinear shallow water numerical model, using source terms estimated by a seafloor deformation model based on the rectangular fault plane formalism. The tsunami waveform obtained from the model is quite sensitive to the specific source assumed. Significant differences were found between the computations and observations of the 30 November 1987 tsunami, suggesting inadequate knowledge of the source characteristics. Fair agreement was found between the data and the model for the first few waves of the 6 March 1988 tsunami. Model estimates of the seismic moment and total slip along the fault plane are also in fair agreement with those derived from the published Harvard centroid solution for the 6 March 1988 event, implying that the computed seafloor deformation does bear some similarity to the actual source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162783
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  • 10
    Electronic Resource
    Electronic Resource
    Approximation algorithms for partitioning a rectangle with interior points (1990)
    Springer
    Algorithmica 5 (1990), S. 11-42 
    Details
    ISSN: 1432-0541
    Keywords: Approximation algorithms ; Partition of rectilinear polygons ; Polynomial-time complexity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract LetR be a rectangle and letP be a set of points located insideR. Our problem consists of introducing a set of line segments of least total length to partition the interior ofR into rectangles. Each rectangle in a valid partition must not contain points fromP as interior points. Since this partitioning problem is computationally intractable (NP-hard), we present efficient approximation algorithms for its solution. The solutions generated by our algorithms are guaranteed to be within three times the optimal solution value. Our algorithm also generates solutions within four times the optimal solution value whenR is a rectilinear polygon. Our algorithm can be generalized to generate good approximation solutions for the case whenR is a rectilinear polygon, there are rectilinear polygonal holes, and the sum of the length of the boundaries is not more than the sum of the length of the edges in an optimal solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01840375
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