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  • Springer  (37)
  • 2000-2004  (37)
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  • 1
    Electronic Resource
    Electronic Resource
    Modelling one-dimensional driven diffusive systems by the Zero-Range Process (2004)
    Springer
    The European physical journal 41 (2004), S. 223-230 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The recently introduced correspondence between one-dimensional two-species driven models and the Zero-Range Process is extended to study the case where the densities of the two species need not be equal. The correspondence is formulated through the length dependence of the current emitted from a particle domain. A direct numerical method for evaluating this current is introduced, and used to test the assumptions underlying this approach. In addition, a model for isolated domain dynamics is introduced, which provides a simple way to calculate the current also for the non-equal density case. This approach is demonstrated and applied to a particular two-species model, where a phase separation transition line is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00314-7
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of identified leg motoneuron structure and function between larval and adult Manduca sexta (2000)
    Springer
    Journal of comparative physiology 186 (2000), S. 327-336 
    Details
    ISSN: 1432-1351
    Keywords: Key words Insect ; Motoneuron ; Properties ; Metamorphosis ; Behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Persistent leg motoneurons of the moth Manduca sexta were investigated in larval and adult animals to compare their dendritic structures, intrinsic electrical properties and pattern of target innervation. The study focused on two identified motoneurons of the prothoracic leg. Despite the complete remodeling of leg muscles, the motoneurons innervated pretarsal flexor muscles in both larval and adult legs. Similarly, although the central dendrites regress and regrow, the branching pattern was similar with the exception of a prominent midline branch that was not present in the adult stage. The intrinsic electrical properties of the motoneurons differed between larval and adult stages. Larval motoneurons had significantly higher membrane input resistances and more depolarized resting membrane potentials than did motoneurons in pharate adults or adults. In all stages, one motoneuron had a low maximal firing frequency, whereas the second motoneuron, which innervated the other half of the muscle, had a high maximum firing frequency. Although the two motoneurons continued to innervate the same halves of the target muscle, their relative effects on muscular contraction were reversed during metamorphosis along with concomitant changes in intrinsic properties. Pretarsal flexor motoneurons in pharate adults (just prior to emergence) displayed properties similar to those in emerged adults.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050433
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  • 3
    Electronic Resource
    Electronic Resource
    Inverting the Motivic Bott Element (2000)
    Springer
    K-Theory 19 (2000), S. 1-28 
    Details
    ISSN: 1573-0514
    Keywords: Motivic cohomology ; étale cohomology ; higher Chow groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We prove a version for motivic cohomology of Thomason's theorem on Bott-periodic K-theory, namely, that for a field k containing the nth roots of unity, the mod n motivic cohomology of a smooth k-scheme agrees with mod n étale cohomology, after inverting the element in H0(k,ℤ(1)) corresponding to a primitive nth root of unity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007874218371
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  • 4
    Electronic Resource
    Electronic Resource
    Issues related to the detection of boundaries (2000)
    Springer
    Landscape ecology 15 (2000), S. 453-466 
    Details
    ISSN: 1572-9761
    Keywords: environmental change ; GIS ; landscape ecology ; modeling ; remote sensing ; riparian ; statistics ; wetland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ecotones are inherent features of landscapes, transitional zones, and play more than one functional role in ecosystem dynamics. The delineation of ecotones and environmental boundaries is therefore an important step in land-use management planning. The delineation of ecotones depends on the phenomenon of interest and the statistical methods used as well as the associated spatial and temporal resolution of the data available. In the context of delineating wetland and riparian ecosystems, various data types (field data, remotely sensed data) can be used to delineate ecotones. Methodological issues related to their detection need to be addressed, however, so that their management and monitoring can yield useful information about their dynamics and functional roles in ecosystems. The aim of this paper is to review boundary detection methods. Because the most appropriate methods to detect and characterize boundaries depend of the spatial resolution and the measurement type of the data, a wide range of approaches are presented: GIS, remote sensing and statistical ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008194205292
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  • 5
    Electronic Resource
    Electronic Resource
    Soluble factors and the development of rod photoreceptors (2000)
    Springer
    Cellular and molecular life sciences 57 (2000), S. 224-234 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Retina; signaling factors; retinoic acid; Hedgehog; fibroblast growth factor; epidermal growth factor; ciliary neurotrophic factor.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Photoreceptors are the most abundant cell type in the vertebrate neural retina. Like the other retinal neurons and the Müller glia, they arise from a population of precursor cells that are multipotent and intrinsic to the retina. Approximately 10 years ago, several studies demonstrated that retinal precursor cells (RPCs) are competent to respond to environmental factors that promote cell type determination and differentiation. Since those studies, significant effort has been directed at identifying the molecular nature of these environmental signals and understanding the precise mechanisms they employ to drive RPCs towards the different retinal fates. In this review, we describe the recent progress toward understanding how environmental factors influence the development of vertebrate rod photoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000686
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  • 6
    Electronic Resource
    Electronic Resource
    The K-theory of fields in characteristic p (2000)
    Springer
    Inventiones mathematicae 139 (2000), S. 459-493 
    Details
    ISSN: 1432-1297
    Keywords: Mathematics Subject Classification (1991): 19D50, 19D45, 19E08, 14C25
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We show that for a field k of characteristic p, H i (k,ℤ(n)) is uniquely p-divisible for i≠n (we use higher Chow groups as our definition of motivic cohomology). This implies that the natural map K n M (k)?K n (k) from Milnor K-theory to Quillen K-theory is an isomorphism up to uniquely p-divisible groups, and that K n M (k) and K n (k) are p-torsion free. As a consequence, one can calculate the K-theory mod p of smooth varieties over perfect fields of characteristic p in terms of cohomology of logarithmic de Rham Witt sheaves, for example K n (X,ℤ/p r )=0 for n〉dimX. Another consequence is Gersten’s conjecture with finite coefficients for smooth varieties over discrete valuation rings with residue characteristic p. As the last consequence, Bloch’s cycle complexes localized at p satisfy all Beilinson-Lichtenbaum-Milne axioms for motivic complexes, except possibly the vanishing conjecture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002220050014
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  • 7
    Electronic Resource
    Electronic Resource
    The Effect of Heat and Moisture Treatments on Enzyme Digestibility of AeWx, Aewx and aeWx Corn Starches (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 571-586 
    Details
    ISSN: 1572-8943
    Keywords: enzyme digestibility ; genetically varied corn starches ; heat moisture treatment ; starch functional response ; starch structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thermal analysis was used to deduce the mechanism of resistance to enzymatic digestion by starches and to account for the extent of resistance at different enzymolysis reaction temperatures. Thermalanalysis was also used to determine the most productive treatment temperature for exploration of the effects of ‘heat-moisture treatment’ of starches on their subsequent chemical and physical behavior, including enzyme digestibility. The starches were selected according to an experimental design based on a nontraditional description of genetically varied corn starches. As a result, each functional response to heat moisture treatments of the starches adjusted to different moisture contents could be assigned to the relevant causative structural factor in the experimental design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010118314383
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  • 8
    Electronic Resource
    Electronic Resource
    Supporting high‐performance I/O in QoS‐enabled ORB middleware (2000)
    Springer
    Cluster computing 3 (2000), S. 151-173 
    Details
    ISSN: 1573-7543
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract To be an effective platform for high‐performance distributed applications, off-the-shelf Object Request Broker (ORB) middleware, such as CORBA, must preserve communication-layer quality of service (QoS) properties both vertically (i.e., network interface ↔ application layer) and horizontally (i.e., end-to-end). However, conventional network interfaces, I/O subsystems, and middleware interoperability protocols are not well-suited for applications that possess stringent throughput, latency, and jitter requirements. It is essential, therefore, to develop vertically and horizontally integrated ORB endsystems that can be (1) configured flexibly to support high-performance network interfaces and I/O subsystems and (2) used transparently by performance-sensitive applications. This paper provides three contributions to research on high-performance I/O support for QoS-enabled ORB middleware. First, we outline the key research challenges faced by high-performance ORB endsystem developers. Second, we describe how our real-time I/O (RIO) subsystem and pluggable protocol framework enables ORB endsystems to preserve high-performance network interface QoS up to applications running on off-the-shelf hardware and software. Third, we illustrate empirically how highly optimized ORB middleware can be integrated with real-time I/O subsystem to reduce latency bounds on communication between high-priority clients without unduly penalizing low-priority and best-effort clients. Our results demonstrate how it is possible to develop ORB endsystems that are both highly flexible and highly efficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019032220910
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  • 9
    Electronic Resource
    Electronic Resource
    Which Way Is Up? Thomas S. Kuhn's Analogy to Conceptual Development in Childhood (2000)
    Springer
    Science & education 9 (2000), S. 107-122 
    Details
    ISSN: 1573-1901
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General
    Notes: Abstract In the Preface to his Structure Of Scientific Revolutions, Thomas S. Kuhn let it be known that his view of scientific development was indebted to the work of pioneering developmental psychologist Jean Piaget. Piaget's model of conceptual development in childhood, on which the child passes through several discontinuous stages, served as the template for Kuhn's reading of the history of a scientific discipline, on which mutually incommensurable periods of normal science are separated by scientific revolutions. The analogy to conceptual change in childhood pervades Kuhn's corpus, serving as the central motif in his well-known essays, ‘A Function for Thought Experiments’ and ‘Second Thoughts on Paradigms’. But it is deeply problematic. For as a careful student of Piaget might note, Piaget, and the developmental psychologists he inspired, relied on the same analogy, but with the order of epistemic dependencies reversed. One begins to worry that Kuhn's use of the analogy, and its subsequent re-use by developmental psychologists, sneaks a vicious circularity into our understanding of important processes. This circularity is grounds for some concern on the part of science educators accustomed to employing such Kuhnian notions as ‘incommensurability’ and ‘paradigm’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008679213807
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  • 10
    Electronic Resource
    Electronic Resource
    Diagnostic Analysis of the Maricopa-Stanfield Irrigation and Drainage District Area (2000)
    Springer
    Irrigation and drainage systems 14 (2000), S. 41-67 
    Details
    ISSN: 1573-0654
    Keywords: performance ; systems analysis ; action research ; diagnostic analysis ; collaborative approach ; interdisciplinary ; integrated resource management ; irrigation management ; irrigation performance ; managed change ; strategic change ; strategic management ; sustainable agriculture ; systems change ; water conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Diagnostic Analysis (DA) is a methodologyfor assessing and understanding the performance of anagricultural system. This analysis is thefirst step in a large system change process, known asthe Management Improvement Program (MIP), whoseobjective is to improve the performance of the agricultural system.A group of Federal andstate of Arizona agencies agreed to apply the MIPmethodology in a western U.S. setting. The purpose of theapplication was to test the applicability of the MIPapproach and to refine themethodology. This paper describes how the DAmethodology was applied in the Maricopa-StanfieldIrrigation and Drainage District (MSIDD) area incentral Arizona, USA, and summarizes the lessonsderived from that experience. Specific findings ofthe DA study and the response of MSIDD areaagriculture to those findings are discussed inseparate articles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006367315969
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