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  • 1
    Online Resource
    Online Resource
    Models and Methods in Few-Body Physics : Proceedings of the 8th Autumn School on the Models and Methods in Few-Body Physics Held in Lisboa, Portugal, October 13-18, 1986 (1987)
    Berlin, Heidelberg : Springer Berlin Heidelberg
    Details Availability
    Keywords: Physics ; Nuclear physics ; Heavy ions ; Hadrons ; Elementary particles (Physics) ; Quantum field theory ; Nuclear fusion ; Physics ; Mathematical physics ; Nuclear physics ; Quantum theory ; Nuclear fusion ; Physics ; Nuclear Physics, Heavy Ions, Hadrons ; Numerical and Computational Methods ; Nuclear Fusion ; Mathematical Methods in Physics ; Elementary Particles, Quantum Field Theory
    Description / Table of Contents: Few-body equations and their solutions in momentum space -- Method of continued fractions applied to three-body calculations -- Configuration-space faddeev calculations: Numerical methods -- Separable expansion methods for the two-body interaction and T-matrix -- Separable expansion methods for the three-body T-matrix -- Three-body problem with separable-expansion techniques and use of modern nucleon-nucleon forces -- Four-body equations in momentum space -- Variational operator padé approximants and applications to the Nucleon-Nucleon scattering -- Variational methods for the few-body bound state in a harmonic oscillator basis -- Resonating group calculations in light nuclear systems -- The hyperspherical expansion method -- TATMS method in few-body physics -- Variational and green's function Monte Carlo calculations of few-body systems -- Bethe-Salpeter equation and the nucleon-nucleon interaction -- Bag models and hadron structure -- Antinucleon annihilations at low energies at LEAR -- Charged-particle interactions in few-body systems -- Calculation of electromagnetic observables in few-body systems -- Scattering theory methods in reacting plasmas -- On stationary two-body scattering theory in two dimensions -- Dilation analytic methods -- Semiclassical methods in few-body systems
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    Edition: Springer eBook Collection. Physics and Astronomy
    ISBN: 9783540477365 , 9783540176473
    Series Statement: Lecture Notes in Physics 273
    URL: http://dx.doi.org/10.1007/3-540-17647-0
    URL: https://zbmath.org/?q=an:0623.00025
    DOI: 10.1007/3-540-17647-0
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Exact triple-avoided-crossing resolution for three-body molecular systems (1993)
    Springer
    Few body systems 14 (1993), S. 81-89 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperradial-adiabatic approach is used to study a region of localized triple-avoided crossing. A three-by-three orthogonal transformation involving a system of strongly coupled hyperradial Schrödinger equations is developed, leading to an exact coherent compensation of all peaks in the matrix elements of adiabatic corrections. In other words, the closure relation between adiabatic corrections matricesH+Q 2=0, which formally holds for a complete basis set, is nicely saturated by three strongly interacting states. One may suggest this to be a property of the hyperradial-adiabatic basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076307
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamical Study of Tensor Observables in the Energy Range of 80 keV to 95 MeV: Tests of Effective Two-Body Models (2000)
    Springer
    Few body systems 28 (2000), S. 189-229 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  Realistic interactions are used to study tensor observables in the energy range of 80 keV to 95 MeV deuteron laboratory energy, as well as the differential cross section for the two-body photodisintegration of . The Siegert form of the E1 multipole operator in the long-wavelength limit is taken as the sole component of the electromagnetic interaction. The three-body Faddeev equations for the bound-state and continuum wave functions are solved using the Paris, Argonne V14, Bonn-A, and Bonn-B potentials. The corresponding nucleon-nucleon t-matrices are represented in a separable form using the Ernst-Shakin-Thaler representation. The Coulomb force between protons is neglected and no three-nucleon force is included. The contribution of nucleon-nucleon P-wave components to the observables is carefully studied, not only in the angular distribution of the observables, but also as a function of the deuteron laboratory energy for fixed centre-of-mass angle. Comparison with data is shown wherever it exists. Results with simple Yamaguchi-type interactions with variable %D-state in the deuteron are compared with realistic interactions and one of these model potentials is used to study the results in terms of contributions from specific wave-function components or terms in the electromagnetic operator. Effective two-body models are examined by means of a derivation that is consistent with the underlying three-body calculation and that leads to an effective two-body t-matrix for neutron-deuteron elastic scattering carrying the same on-shell amplitudes as the original three-body equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010070021
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Faddeev calculation of energy states in two-electron atoms (1988)
    Springer
    Few body systems 5 (1988), S. 117-126 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Faddeev equations are used to calculate the ground state as well as a few ortho- and para-excited states of e−e+e−, H−, He, Li+ and Be++ atoms. The Coulomb potential is represented in a separable form using the appropriate Coulombic Sturmians for both the attractive and repulsive interactions. Up to 36 Sturmians are employed in each interaction leading to the solution of a maximum of 56 coupled one-variable integral equations. Results are compared with data or predictions from variational calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01079583
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  • 5
    Electronic Resource
    Electronic Resource
    Adiabatic calculation of the three-nucleon force (1986)
    Springer
    Czechoslovak journal of physics 36 (1986), S. 357-359 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A preliminary estimate of the three-nucleon force within the adiabatic framework has already been done. In this work we try to improve the first calculation by using relativistic kinematics for the pion and including theP 11 absorption channel, as well as theP 33 and the less importantS 13,S 11,P 13,P 31 channels, in theπN interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01597837
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  • 6
    Electronic Resource
    Electronic Resource
    Contribution ofp-wave (3)+1 subamplitudes to4He binding energy and scattering observables below four-body breakup threshold (1986)
    Springer
    Few body systems 1 (1986), S. 69-81 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The four-body equations of Alt, Grassberger and Sandhas, in the form that the (2)+(2) subsystem amplitudes are treated by the convolution method, are solved for separable two-body interactions between nucleon pairs in the channels3S1-3D1 (t 00 alone) and1S0. AllL=0 andL=1 (3)+1 subamplitudes are represented in a separable form using the energy dependent pole expansion. The contribution ofp-wave (3)+1 subamplitudes to the4He binding energy, threshold scattering observables and low energy cross sections forn 3H→n 3H,p 3He→p 3He,dd→dd anddd→p 3H reactions is studied for different two-body potentials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01277075
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  • 7
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    B-Type Natriuretic Peptides Help in Cardioembolic Stroke Diagnosis: Pooled Data Meta-Analysis [Clinical Sciences] (2015)
    American Heart Association (AHA)
    In: Stroke
    Details
    Publication Date: 2015-04-28
    Description: Background and Purpose— Determining the underlying cause of stroke is important to optimize secondary prevention treatment. Increased blood levels of natriuretic peptides (B-type natriuretic peptide/N-terminal pro-BNP [BNP/NT-proBNP]) have been repeatedly associated with cardioembolic stroke. Here, we evaluate their clinical value as pathogenic biomarkers for stroke through a literature systematic review and individual participants’ data meta-analysis. Methods— We searched publications in PubMed database until November 2013 that compared BNP and NT-proBNP circulating levels among stroke causes. Standardized individual participants’ data were collected to estimate predictive values of BNP/NT-proBNP for cardioembolic stroke. Dichotomized BNP/NT-proBNP levels were included in logistic regression models together with clinical variables to assess the sensitivity and specificity to identify cardioembolic strokes and the additional value of biomarkers using area under the curve and integrated discrimination improvement index. Results— From 23 selected articles, we collected information of 2834 patients with a defined cause. BNP/NT-proBNP levels were significantly elevated in cardioembolic stroke until 72 hours from symptoms onset. Predictive models showed a sensitivity 〉90% and specificity 〉80% when BNP/NT-proBNP were added considering the lowest and the highest quartile, respectively. Both peptides also increased significantly the area under the curve and integrated discrimination improvement index compared with clinical models. Sensitivity, specificity, and precision of the models were validated in 197 patients with initially undetermined stroke with final pathogenic diagnosis after ancillary follow-up. Conclusions— Natriuretic peptides are strongly increased in cardioembolic strokes. Future multicentre prospective studies comparing BNP and NT-proBNP might aid in finding the optimal biomarker, the best time point, and the optimal cutoff points for cardioembolic stroke identification.
    Keywords: Cerebrovascular disease/stroke, Acute Cerebral Infarction, Embolic stroke
    Print ISSN: 0039-2499
    Electronic ISSN: 1524-4628
    Topics: Medicine
    Published by American Heart Association (AHA)
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  • 8
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    RAGE in Glioma Angiogenesis (2014)
    The American Association for Cancer Research (AACR)
    Details
    Publication Date: 2014-12-16
    Description: Interaction of RAGE (the receptor for advanced glycation endproducts) with its ligands can promote tumor progression, invasion, and angiogenesis. Although blocking RAGE signaling has been proposed as a potential anticancer strategy, functional contributions of RAGE expression in the tumor microenvironment (TME) have not been investigated in detail. Here, we evaluated the effect of genetic depletion of RAGE in TME on the growth of gliomas. In both invasive and noninvasive glioma models, animal survival was prolonged in RAGE knockout (Ager−/−) mice. However, the improvement in survival in Ager−/− mice was not due to changes in tumor growth rate but rather to a reduction in tumor-associated inflammation. Furthermore, RAGE ablation in the TME abrogated angiogenesis by downregulating the expression of proangiogenic factors, which prevented normal vessel formation, thereby generating a leaky vasculature. These alterations were most prominent in noninvasive gliomas, in which the expression of VEGF and proinflammatory cytokines were also lower in tumor-associated macrophages (TAM) in Ager−/− mice. Interestingly, reconstitution of Ager−/− TAM with wild-type microglia or macrophages normalized tumor vascularity. Our results establish that RAGE signaling in glioma-associated microglia and TAM drives angiogenesis, underscoring the complex role of RAGE and its ligands in gliomagenesis. Cancer Res; 74(24); 7285–97. ©2014 AACR.
    Print ISSN: 0008-5472
    Electronic ISSN: 1538-7445
    Topics: Medicine
    Published by The American Association for Cancer Research (AACR)
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