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  • 1
    Digitale Medien
    Digitale Medien
    Measurement of short-term nutrient uptake rates in cranberry by aeroponics (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Aeroponics, a soil-less plant culture system in which fresh nutrient solutions are intermittently or continuously misted on to plant roots, is capable of sustaining plant growth for extended periods of time while maintaining a constantly refreshed nutrient solution. Although used relatively extensively in commercial installations and in root physiology research, use of aeroponics in nutrient studies is rare. The object of this study was to examine whether nutrient uptake rates could be calculated for aeroponic systems by difference using measurements of concentrations and volumes of input and efflux solutions. Data were collected from an experiment with cranberry plants (Vaccinium macrocarpon Ait. cv. Stevens) cultured aeroponically with nutrient solutions containing various concentrations of ammonium-N and isotopically labelled nitrate-N. Validation of the calculated uptake rates was sought by: (1) evaluating charge balance of the solutions and total ion uptake (including proton efflux) and (2) comparison with N-isotope measurements. Charge balance and proton efflux calculations required use of chemical modelling of the solutions to determine speciation of dissolved phosphate and acid-neutralizing capacity (ANC). The results show that charge balance requirements were acceptably satisfied for individual solution analyses and for total ion uptake when proton efflux was included. Relative rates of nitrate/ammonium uptake determined by difference were in agreement with those determined by isotopic techniques. Additional information was easily obtained from this experimental technique, including evidence of diurnal variation in nutrient uptake, correlation between ammonium uptake and proton efflux, and the relationship between ion concentration and uptake. Use of aeroponic systems for non-destructive measurement of water and ion uptake rates for numerous other species and nutrients appears promising.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00246.x
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  • 2
    Digitale Medien
    Digitale Medien
    Computer screening for early detection of melanoma—is there a future? (1995)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 132 (1995), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Computer image analysis in the study of pigmented lesions is critically examined and discussed in the light of the current published data. The potential for objective analysis by computers as a possible screening aid for the inexperienced clinician is discussed. The future for this technology is exciting if handled with care.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2133.1995.tb08664.x
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  • 3
    Digitale Medien
    Digitale Medien
    catena-Poly[[(1,4-dioxane-O1)iodolithium]-μ-(1,4-dioxane-O1:O4)] (1997)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 1387-1388 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270197008482
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  • 4
    Digitale Medien
    Digitale Medien
    Subdifferentiation of monotone functions from semilattices to distributive lattices (1995)
    Springer
    Order 12 (1995), S. 307-313 
    Details
    ISSN: 1572-9273
    Schlagwort(e): 06A12 ; 52A01 ; Semilattice ; monotone ; convexity ; distributive lattice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract An abstract algebraic interpretation of subgradients of real-valued convex functions is presented, and the definition is extended to modal theory. The main result is that a convex (i.e., monotone) function from a semilattice to acomplete distributive lattice is the join of its set of subgradients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01111745
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  • 5
    Digitale Medien
    Digitale Medien
    Simple algebras of hermitian operators (1995)
    Springer
    Archiv der Mathematik 65 (1995), S. 534-539 
    Details
    ISSN: 1420-8938
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01194173
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  • 6
    Digitale Medien
    Digitale Medien
    Semilattice-based dualities (1996)
    Springer
    Studia logica 56 (1996), S. 225-261 
    Details
    ISSN: 1572-8730
    Schlagwort(e): Priestley duality ; Stone duality ; Pontryagin duality ; character group ; program semantics ; Bochvar Logic ; regular identities
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Philosophie
    Notizen: Abstract The paper discusses “regularisation” of dualities. A given duality between (concrete) categories, e.g. a variety of algebras and a category of representation spaces, is lifted to a duality between the respective categories of semilattice representations in the category of algebras and the category of spaces. In particular, this gives duality for the regularisation of an irregular variety that has a duality. If the type of the variety includes constants, then the regularisation depends critically on the location or absence of constants within the defining identities. The role of schizophrenic objects is discussed, and a number of applications are given. Among these applications are different forms of regularisation of Priestley, Stone and Pontryagin dualities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00370148
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  • 7
    Digitale Medien
    Digitale Medien
    Automated fuzzy knowledge acquisition with connectionist adaptation (1996)
    Springer
    Neural computing & applications 4 (1996), S. 27-34 
    Details
    ISSN: 1433-3058
    Schlagwort(e): Fuzzy logic ; Genetic algorithms ; Knowledge acquisition ; Learning ; Neural networks ; Optimisation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Mathematik
    Notizen: Abstract This paper presents an automated knowledge acquisition architecture for the truck docking problem. The architecture consists of a neural network block, a fuzzy rule generation block and a genetic optimisation block. The neural network block is used to quickly and adaptively learn from trials the driving knowledge. The fuzzy rule generation block then extracts the driving knowledge to form a knowledge rule base. The driving knowledge rule base is further optimised in the genetic optimisation block using a genetic algorithm. Computer simulations are presented to show the effectiveness of the architecture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01413867
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  • 8
    Digitale Medien
    Digitale Medien
    Affine spaces and algebras of subalgebras (1995)
    Springer
    Algebra universalis 34 (1995), S. 527-540 
    Details
    ISSN: 1420-8911
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01181876
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  • 9
    Digitale Medien
    Digitale Medien
    Vector lattices and rooted trees (1995)
    Springer
    Algebra universalis 34 (1995), S. 110-117 
    Details
    ISSN: 1420-8911
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract There is a 1-1-correspondence between isomorphism classes of finite dimensional vector lattices and finite rooted unlabelled trees. Thus the problem of counting isomorphism classes of finite dimensional vector lattices reduces to the well-known combinatorial problem of counting these trees. The correspondence is used to identify the class of congruence lattices of finite-dimensional vector lattices as the class of finite dual relative Stone algebras, in partial answer to a question posed by Birkhoff.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01200493
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  • 10
    Digitale Medien
    Digitale Medien
    Quasigroups, right quasigroups and category coverings (1996)
    Springer
    Algebra universalis 35 (1996), S. 233-248 
    Details
    ISSN: 1420-8911
    Schlagwort(e): 20N05
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The category of modules over a fixed quasigroup in the category of all quasigroups is equivalent to the category of representations of the fundamental groupoid of the Cayley diagram of the quasigroup in the category of abelian groups. The corresponding equivalent category of coverings, and the generalization to the right quasigroup case, are also described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01195498
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