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  • Institute of Physics  (124)
  • Springer  (109)
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  • 1
    Electronic Resource
    Electronic Resource
    Design of minimax robust filtering for an integrated GPS/INS system (1999)
    Springer
    Journal of geodesy 73 (1999), S. 407-411 
    Details
    ISSN: 1432-1394
    Keywords: Key words. Kalman filtering ; GPS/INS ; Uncertainty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract. The problem of navigation systems with uncertain noise is considered. A minimax robust filtering which can minimize the worst performance under noise uncertainties using the game theory is proposed. This new filter is applied to an integrated GPS/INS navigation system. A high dynamics aircraft trajectory is designed to test the new filter. The results show that minimax robust filtering performs better than standard Kalman filtering when noise parameters of an inertial measurement unit change their statistical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001900050260
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  • 2
    Electronic Resource
    Electronic Resource
    Persistence, stability and level crossings in an integrodifferential system (1994)
    Springer
    Journal of mathematical biology 32 (1994), S. 395-426 
    Details
    ISSN: 1432-1416
    Keywords: Uniform persistence ; stability ; Lyapunov functional ; level-crossing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Dynamical characteristics of an integrodifferential system modelling two species competition with hereditary effects are investigated; in particular we derive sufficient conditions for the persistence of the species, existence of an attracting periodic solution and ‘level-crossings’ of solutions about the periodic solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160166
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  • 3
    Electronic Resource
    Electronic Resource
    In vivo incorporation of14C-phenylalanine into ascidian tunichrome (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 367-371 
    Details
    ISSN: 1420-9071
    Keywords: Tunichrome ; phenylalanine ; ascidian ; tunicates ; blood pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ascidia ceratodes exposed to14C-phenylalanine in the surrounding seawater incorporates the radiolabel into newly biosynthesized tunichrome molecules. Radioactivity can be detected in tunichrome extracted from circulating blood cells within one day following initial exposure to the radiolabel; weak activity (≤4 μCi/mol tunichrome=22 nmol phenylalanine/mol tunichrome) is detected in 1 to 10 days; significantly higher amounts of radiolabel (57 μCi/mol tunichrome=318 nmol phenylalanine/mol tunichrome) appear 20 days after seawater exposure. Therefore, phenylalanine can function as a precursor in the biosynthesis of tunichrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923431
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  • 4
    Electronic Resource
    Electronic Resource
    Parallel Algorithms for Maximal Acyclic Sets (1997)
    Springer
    Algorithmica 19 (1997), S. 354-368 
    Details
    ISSN: 1432-0541
    Keywords: Key words. Parallel algorithms, Maximal acyclic sets, Planar graphs.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. Given a graph G=(V,E), the well-known spanning forest problem of G can be viewed as the problem of finding a maximal subset F of edges in G such that the subgraph induced by F is acyclic. Although this problem has well-known efficient NC algorithms, its vertex counterpart, the problem of finding a maximal subset U of vertices in G such that the subgraph induced by U is acyclic, has not been shown to be in NC (or even in RNC) and is not believed to be parallelizable in general. In this paper we present NC algorithms for solving the latter problem for two special cases. First, we show that, for a planar graph with n vertices, the problem can be solved in $O(\log^3 n)$ time with O(n) processors on an EREW PRAM. Second, we show that the problem is solvable in NC if the input graph G has only vertex-induced paths of length polylogarithmic in the number of vertices of G. As a consequence of this result, we show that certain natural extensions of the well-studied maximal independent set problem remain solvable in NC. Moreover, we show that, for a constant-degree graph with n vertices, the problem can be solved in $O(\sqrt{n}\log^3n)$ time with O(n 2 ) processors on an EREW PRAM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009178
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  • 5
    Electronic Resource
    Electronic Resource
    On the Linear-Cost Subtree-Transfer Distance between Phylogenetic Trees (1999)
    Springer
    Algorithmica 25 (1999), S. 176-195 
    Details
    ISSN: 1432-0541
    Keywords: Key words. Evolutionary trees, Approximation algorithms, Lower bounds.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. Different phylogenetic trees for the same group of species are often produced either by procedures that use diverse optimality criteria [16] or from different genes [12] in the study of molecular evolution. Comparing these trees to find their similarities and dissimilarities (i.e., distance ) is thus an important issue in computational molecular biology. Several distance metrics including the nearest neighbor interchange (nni) distance and the subtree-transfer distance have been proposed and extensively studied in the literature. This article considers a natural extension of the subtree-transfer distance, called the linear-cost subtree-transfer distance, and studies the complexity and efficient approximation algorithms for this distance as well as its relationship to the nni distance. The linear-cost subtree-transfer model seems more suitable than the (unit-cost) subtree-transfer model in some applications. The following is a list of our results: 1. The linear-cost subtree-transfer distance is in fact identical to the nni distance on unweighted phylogenies. 2. There is an algorithm to compute an optimal linear-cost subtree-transfer sequence between unweighted phylogenies in O(n ⋅ 2 O(d) ) time, where d denotes the linear-cost subtree-transfer distance. Such an algorithm is useful when d is small. 3. Computing the linear-cost subtree-transfer distance between two weighted phylogenetic trees is NP-hard, provided we allow multiple leaves of a tree to share the same label (i.e., the trees are not necessarily uniquely labeled). 4. There is an efficient approximation algorithm for computing the linear-cost subtree-transfer distance between weighted phylogenies with performance ratio 2 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00008273
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  • 6
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships of the Magnoliaceae inferred from cpDNA matK sequences (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 925-930 
    Details
    ISSN: 1432-2242
    Keywords: Key words Magnoliaceae ; Molecular phylogeny ; Chloroplast DNA ; matK gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The coding region of the matK gene was sequenced to infer the phylogeny of the family Magnoliaceae. Phylogenetic analyses of 21 matK sequences representing ten genera of Magnoliaceae and three outgroups suggest relationships among both subfamilies and genera. Monophyly of the subfamily Liriodendroideae (the genus Liriodendron) and the subfamily Magnolioideae is strongly supported, respectively. Within the subfamily Magnolioideae, three clades are formed: (1) the genus Magnlietia, (2) the subgenus Magnolia, and (3) the subgenus Yulania, with the genera Michelia, Paramichelia, Tsoongiodendron, Alcimandra, Kmeria, Parakmeria and Manglietiastrum. However, the genus Magnolia is shown to be a polyphyletic group, and the genus Michelia a paraphyletic group. Relatively low sequence divergences are detected among genera of the the subfamily Magnolioideae, ranging from 0.14% to 1.70%, especially in the tribe Micheliinae (0.14–0.98%). Molecular evidence from matK sequence data suggests that the phylogenetic positions and the delimitation of the eight genera Magnolia, Michelia, Tsoongiodendron, Paramichelia, Alcimandra, Kmeria, Parakmeria and Manglietiastrum need to be reconsidered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051563
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  • 7
    Electronic Resource
    Electronic Resource
    Spatial orientation of the spin vectors of the disk galaxies in the Virgo cluster I. A catalogue of the disk galaxies in the Virgo cluster (1996)
    Springer
    Astrophysics and space science 239 (1996), S. 71-88 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Based on four UK Schmidt Telescope (UKST) IIIa-j direct plates which had been digitized by the Automated Plate Measuring System (APM), a detailed identification of the disk galaxies in the Virgo cluster has been carried out. The certain and possible member galaxies are mainly selected from the updated Catalogue of 2096 Galaxies in the Virgo Cluster Area (VCC). The area of this identification covers a ∼ 85 square degree region centered on this cluster. As a result, we compiled a new catalogue of 340 certain and possible member disk galaxies, including 85 lenticulars (SO), 136 spirals (S) and 119 irregulars (Irr), where the APM-measured values of the position angle (P.A.) and diameters of 299 disk galaxies are provided. For at least 149 galaxies, the values of the P.A. and diameters are published for the first time. Comparison between the APM-measured P.A. and diameters of galaxies and those given by the Uppsala General Catalog of Galaxies (UGC) demonstrates the reliability of our data. The statistical properties and completeness of this database are also discussed. Compared with the UGC-given P.A. and diameters which were determined by eyes, our data has no selection effect owing to the instrument measurements. Within our searching region, this might be the largest and relatively complete photometric database published so far for investigating the spatial orientation of the spin vectors of galaxies in the Virgo cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653768
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  • 8
    Electronic Resource
    Electronic Resource
    Strong and electroweak interactions and their unification with non-commutative space-time (2003)
    Springer
    The European physical journal 28 (2003), S. 557-560 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Quantum field theories based on non-commutative space-time (NCQFT) have been extensively studied recently. However no NCQFT model which can uniquely describe the strong and electroweak interactions has been constructed. This prevents one to make a consistent and systematic study of non-commutative space-time. In this work we construct a NCQFT model based on the trinification gauge group $SU(3)_C\times SU(3)_{{L}}\times SU(3)_{R}$ . A unique feature of this model, that all matter fields (fermions and Higgs bosons) are assigned to (anti-) fundamental representations of the factor SU(3) groups, allows us to construct a NCQFT model for strong and electroweak interactions and their unification without ambiguities. This model provides an example which allows one to make a consistent and systematic study of non-commutative space-time phenomenology. We also comment on some related issues regarding extensions to E6 and $U(3)_C\times U(3)_{L}\times U(3)_{R}$ models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2003-01185-5
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  • 9
    Electronic Resource
    Electronic Resource
    Vesicle formation of 1:1 cationic and anionic surfactant mixtures in nonaqueous polar solvents (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 354-360 
    Details
    ISSN: 1435-1536
    Keywords: Key words Vesicle formation ; cationic and anionic surfactant mixtures ; nonaqueous polar solvent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The vesicle formations of 1:1 cationic-anionic surfactants in various nonaqueous polar solvents and their aqueous mixtures were investigated. Outstanding vesicle-forming capability and stability of cationic and anionic surfactants were found in nonaqueous polar solvents and their aqueous mixtures except for in formamide. A small amount of formamide destroys the vesicles formed by cationic-anionic surfactants in aqueous solutions. These results could be very well explained based on the effect of the medium dielectric constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050392
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of a crystalline organosilicic polymer: poly[1-(dimethyl)silyl, 4-(dimethylethylene)silyl benzene] (1987)
    Springer
    Polymer bulletin 17 (1987), S. 45-48 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The present note deals with the characterization of a serie of telechelic organosilicic polymers (Mn,Tg,Tm,ΔHm). These crystallizable polymers can been used as precursor molecules in the synthesis of multiblock copolymers, in association with amorphous blocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00955882
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