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  • 1
    Electronic Resource
    Electronic Resource
    The Influence of Mass Loss on the Eccentricity of Double Star Orbits (1998)
    Springer
    Astrophysics and space science 261 (1998), S. 205-207 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this comunication we study the behaviour of the eccentricity of double star orbits (visual and wide spectroscopic binaries) according to simplified laws of mass loss. Applications to the systems WDS 05245S0224 - HD 35411, WDS 05387S0236 - HD 37468 and WDS 06154S0902 - HD 43362 are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002048418040
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  • 2
    Electronic Resource
    Electronic Resource
    Transition-metal complexes in the prebiotic soup (1977)
    Springer
    Naturwissenschaften 64 (1977), S. 91-91 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437354
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  • 3
    Electronic Resource
    Electronic Resource
    Iron ligand mutants in protein R2 of Escherichia coli ribonucleotide reductase (1996)
    Springer
    JBIC 1 (1996), S. 247-256 
    Details
    ISSN: 1432-1327
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract  Ribonucleotide reductase protein R2 contains a diiron-oxo center with the ability to generate and stabilize a catalytically essential tyrosyl radical. The six protein-derived ligands (four carboxylates and two histidines) of the diiron site were, in separate experiments, mutated to alanines and in two cases also to histidines. We found that removal or exchange of an iron ligand did not in general abolish the formation of a diiron site in the mutant proteins, although all mutant proteins lost the bound metal ions with time upon storage. Iron bound to the mutant proteins was characterized by light absorption, EPR and resonance Raman spectroscopy. In addition, the ability of the mutant proteins to form a tyrosyl free radical and the catalytic competence of the latter were determined by EPR spectroscopy and activity measurements. The diiron sites of mutant proteins D84H and E238A were quite reminiscent of that in wild-type R2. Four of the other mutant proteins (H118A, E204A, E204H, H241A) could form the same number of metal sites as wild-type R2, but with different spectroscopic properties. The mutation E115A affecting the only μ-bridging ligand lowered the amount of bound iron to less than half. An important observation was that D84A, H118A and E204A formed transient tyrosyl radicals, but only the E204A mutant protein was enzymatically active. D84A and H118A affect iron ligands which have been suggested to participate in long-range electron transfer during catalysis. Our observation that these mutant proteins are catalytically inert, despite formation of a tyrosyl radical, underscores the necessity for an intact electron transfer pathway for catalytic activity in ribonucleotide reductase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007750050050
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  • 4
    Electronic Resource
    Electronic Resource
    Visual double stars in professional spanish astronomy: Past, present and future projects (1988)
    Springer
    Astrophysics and space science 142 (1988), S. 191-193 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary This poster describes the contribution of professional Spanish astronomy to all aspects of the study of visual double stars (observation, calculation of orbits and development of new methods of calculation), together with projected programmes of visual and interferometer observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656203
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  • 5
    Electronic Resource
    Electronic Resource
    Application of the stroboscopic method to the stellar three-body problem (1991)
    Springer
    Astrophysics and space science 185 (1991), S. 51-61 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stellar three-body problem has been approached by directly integrating the equations of motion in the orbital elements. The problem is set up in a barycentric chain with the orbits as perturbed ellipses. The integration was performed using the semi-analytical stroboscopic method, which is particularly useful for solving differential systems that depend on several slow variables and one fast, angular variable. Perturbation theory is applied and the solution for a particular order is obtained by way of successive approximations on the fundamental period of the fast variable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642705
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  • 6
    Electronic Resource
    Electronic Resource
    Combined design of structures and controllers for optimal maneuverability (1991)
    Springer
    Structural and multidisciplinary optimization 3 (1991), S. 214-230 
    Details
    ISSN: 1615-1488
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper treats the problem of the combined design of structure/control systems for achieving optimal maneuverability. A maneuverability index which directly reflects the time required to perform a given maneuver or set of maneuvers is introduced. By designing the flexible appendages of a spacecraft, its maneuverability is optimized under the constraints of structural properties, and of the postmaneuver spill-over being within a specified bound. The spillover reduction is achieved by making use of an appropriate control design model. The distributed parameter design problem is approached using assumed shape functions and finite element analysis with dynamic reduction. Characteristics of the problem and problem solving procedures have been investigated. Adaptive approximate design methods have been developed to overcome computational difficulties. It is shown that the global optimal design may be obtained by tuning the natural frequencies of the spacecraft to satisfy specific constraints. We quantify the difference between a lower bound to the objective function associated with the original problem and the estimate obtained from the modified problem as the index for the adaptive refinement procedure. Numerical examples show that the results of the optimal design can provide substantial improvement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01744056
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  • 7
    Electronic Resource
    Electronic Resource
    Multicriterion structure/control design for optimal maneuverability and fault tolerance of flexible spacecraft (1994)
    Springer
    Journal of optimization theory and applications 82 (1994), S. 219-251 
    Details
    ISSN: 1573-2878
    Keywords: Optimization ; control ; structures ; spacecraft ; fail-safe design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A multicriterion design problem for optimal maneuverability and fault tolerance of flexible spacecraft is considered. The maneuverability index reflects the time required to perform rest-to-rest attitude maneuvers for a given set of angles, with the postmaneuver spillover within a specified bound. The performance degradation is defined to reflect the maximum possible attitude error after maneuver due to the effect of faults. The fault-tolerant design is to minimize the worst performance degradation from all admissible faults by adjusting the design of the spacecraft. It is assumed that admissible faults can be specified by a vector of real parameters. The multicriterion design for optimal maneuverability and fault tolerance is shown to be well defined, leading to a minimax problem. Analysis for this nonsmooth problem leads to closed-form expressions of the generalized gradient of the performance degradation function with respect to the fault parameters and structural design variables. Necessary and sufficient conditions for the optimum are derived, and the closed-form expressions of the generalized gradients are applied for their interpretation. The bundle method is applicable to this minimax problem. Approximate methods which efficiently solve this minimax problem with relatively little computational difficulties are presented. Numerical examples suggest that it is possible to improve the fault tolerance substantially with relatively little loss in maneuverability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02191852
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  • 8
    Electronic Resource
    Electronic Resource
    A histochemical study of the cephalic-cervical system of a gnathostomatid nematode,Echinocephalus sinensis, parasite of oysters and rays (1980)
    Springer
    Parasitology research 63 (1980), S. 59-63 
    Details
    ISSN: 1432-1955
    Keywords: Echinocephalus sinensis ; Gnathostomatidae ; Histochemistry ; Morphology ; Nematodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Glycogen, protein, succinic dehydrogenase, adenosine triphosphatase, elastin, and collagen were demonstrated within the cephalic-cervical system of adult and third-stageEchinocephalus sinensis. Weak positive histochemical reactions were observed for the presence of sulphated mucosubstances, esterase, acetylcholinesterase, lipids, and acid phosphatase. Tests for the following substances were negative: leucine aminopeptidase, alkaline phosphatase, phosphorylase, neurosecretory substances, and proteases. The present finding seems to support a previous suggestion that this unique system does not have an active secretory role but acts mainly as a hydrostatic organ for the inflation of the headbulb of the worm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927726
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of formation of the mercury/II/-cyanide-bromide mixed ligand complex in dioxan-water solvent mixtures (1974)
    Springer
    Reaction kinetics and catalysis letters 1 (1974), S. 125-128 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Кинетика ооразования смешанного комплекса цианисто-бромистой ртути (ІІ) была изучена спектрофотометрически при 25°C, в смеси диоксан-вода с различным составом. Реакция может быть описана уравнением скорости простого обратимого процесса второго порядка. Константы скорости обеих — прямой и обратной — реакций изменяются периодически в зависимости от состава смеси растворителей, в то время как константа равновесия реакции не изменяется значительно. Такое необычное поведение констант скоростей является результатом селективной сольватации реактантов.
    Notes: Abstract The kinetics of formation of the mercury/II/-cyanide-bromide mixed ligand complex have been studied spectrophotometrically at 25°C, in dioxan-water mixtures of different compositions. The reaction can be described by the rate equation of a simple second-order reversible process. The rate constants of both the forward and reverse reaction vary periodically with the solvent composition, whereas the equilibrium constant of the reaction does not change to a large extent. The unusual behaviour of the rate constants is due to selective solvation of the reactants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02067529
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  • 10
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    Building a national wetland inventory: a review and roadmap to move forward (2018)
    Springer
    Details
    Publication Date: 2018-06-04
    Print ISSN: 0923-4861
    Electronic ISSN: 1572-9834
    Topics: Biology
    Published by Springer
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