Showing papers by "Bielefeld University published in 1981"
TL;DR: In this article, a game theoretical analysis of animal contest situations which are asymmetric in more than one aspect: two opponents may for example be imagined which differ in "ownership status" as well as in "relative fighting ability".
331 citations
TL;DR: One-loop corrections to the Higgs-boson decays $H{\ensuremath{\tau}}^{+}+$H{W}+}$ up to Higgs boson masses of about 1 TeV are calculated in this paper.
Abstract: One-loop corrections to the Higgs-boson decays $H{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$, $H{W}^{+}{W}^{\ensuremath{-}}$, and $\mathrm{HZZ}$ are calculated up to Higgs-boson masses of about 1 TeV. The corrections are of the order of 10% for $200 \mathrm{GeV}\ensuremath{\lesssim}{m}_{H}\ensuremath{\lesssim}1 \mathrm{TeV}$ within the renormalization scheme adopted. Renormalization problems are discussed in detail. A complete set of one-loop counterterms in the 't Hooft gauge is presented.
232 citations
TL;DR: In this article, the authors considered the hard scattering processes gg→3S1 g and gq→3P0,1,2q with subsequent decay 3PJ→ 3S1γ as the main mechanisms at large transverse momenta.
218 citations
TL;DR: The Luteinizing hormone-releasing hormone (LHRH) system of the platyfish Xiphophorus has been studied using immunohistochemistry and retrograde transport of horseradish peroxidase (HRP) as discussed by the authors.
214 citations
TL;DR: In this article, the energy density of an SU(2) Yang-Mills system at finite physical temperature was calculated by Monte Carlo simulation on the lattice, showing that the conventional euclidean lattice formulation converges to the parameter free Stefan-Boltzmann limit of a free gluon gas in the continuum.
187 citations
TL;DR: In this article, a phase matching with the positive dispersive tare gas Ar or Xe was proposed to improve the efficiency of the conversion of negative dispersive Kr to positive dispersion Xe by two orders of magnitude.
Abstract: Nonresonant frequency tripling of intense dye laser radiation in negative dispersive Kr ( \lambda = 1203-1235 A ) is efficiently enhanced by phase matching with the positive dispersive tare gas Ar or Xe. Phase matching of Kr with Ar improved the efficiency of the conversion of 3648 A to L_{\alpha} = 1216 A by more than two orders of magnitude. At L_{\alpha}, 16 W ( 4 \cdot 10^{10} photons/pulse) could be generated with 1.5 MW pulses of a frequency doubled dye laser. The optimum conversion is limited by absorption of the VUV in the rare gas mixture and by dielectric breakdown. In mixtures of Kr and Xe, the dependence of the VUV on the density of the two gas components indicates a phase difference between their contributions to the induced third-order polarization. Measurements of the VUV output of different Kr-Xe mixtures provide a determination of the ratio of the third-order nonlinear susceptibilities χ Kr /χ Xe and of the wave vector mismatches per atom C Kr /C Xe at wavelengths \lambda = 1205-1230 A Besides frequency tripling in Kr, third-harmonic generation of blue dye laser light ( \lambda = 4208-4406 A) has been investigated in Xe phase matched with Kr. The peak power of the tunable VUV at \lambda = 1403-1469 A exceeded 30 W ( 8.7 \cdot 10^{10} photons/pulse).
145 citations
TL;DR: In this article, Even and Tarjan showed that the decision problem for Hex is in PS PACE, and that the game of Hex is PSPACE-complete for a generalization of Hex played on planar graphs.
Abstract: There are a number of board games such as Checkers [2], Go [5], and Gobang [8], which are known to be PSPACE-hard This means that the problem to determine the player having a winning strategy in a given situation on an nA—n board of one of these games is as hard to solve as everything computable in polynomial space PSPACE-completeness has been previously proven for some combinatorial games played on graphs or by logical formulas [1, 9]
In this paper we will show that the same holds for the game of Hex The crucial point of the proof is to establish PSPACE-hardness for a generalization of Hex played on planar graphs This will be done by showing that the problem, whether a given quantified Boolean formula in conjunctive normal form is true, is polynomial time-reducible to the decision problem for generalized Hex In order to do this we will use methods, which were also used to prove PSPACE-completeness of planar Geography in [5] Therefore our proof is quite different from the proof provided by Even and Tarjan [1], who showed PSPACE-completeness of generalized Hex played on arbitrary graphs Since it is easy to see that the decision problem for Hex is in PS PACE, the decision problem for Hex is PSPACE-complete
114 citations
TL;DR: Two models of Random Access Machines suitable for sorting integers are presented and it is shown that a RAM with addition, subtraction, multiplication, and integer division can sort integers in the range of[0,2^{cn}] in O(n c + n) steps.
109 citations
TL;DR: After injecting horseradish peroxidase solution into the eye or optic nerve in cichlid or poecilid fishes, neurons in the olfactory bulb, ventral telencephalon and pretectal area of the diencephalon contain retrogradely transported HRP, considered to be the origin of centrifugal innervation of the retina.
93 citations
TL;DR: This algorithm is easily seen to be a generalization of the well-known QR algorithm and how it is related to the power method and inverse iteration, and for special matrices the connection between the LR and HR algorithms is indicated.
92 citations
TL;DR: An instructive counterexample is presented showing that the coding strategy of Cover, El Gamal, and Salehi for multiple access channels with arbitrarily correlated sources is not optimal.
Abstract: An instructive counterexample is presented showing that the coding strategy of Cover, El Gamal, and Salehi for multiple access channels with arbitrarily correlated sources is not optimal. Some new insight into the very difficult problem of determining the true capacity regions is given by this example.
TL;DR: The result indicate that the activation of the latent collagenase can be regulated by the glutathione cycle, and might perhaps be coupled to the phagocytosis-associated respiratory burst known to be linked to the hexose monophosphate shunt activity of the cell.
Abstract: Latent collagenase form human polymorphonuclear leukocytes was isolated and shown to be activatable by disulfides, e.g. cystine, oxidized glutathione and insulin. Activation proceeds via a disulfide-thiol exchange mechanisms by which the active proteinase (Mr 65500–67000) is released from the inactive latent enzyme (Mr 91000–94000) which is a mixed disulfide of an inhibitor (Mr20000–25000) and the collagenase [Macartney and Tschesche (1980) FEBS Lett. 119, 327-332].
In a system in vitro the activation can be coupled to the glutathione cycle. Reduced glutathione and hydrogen peroxide in the presence of any of the enxymes glutathione peroxidase, NADH peroxidase, lactoperoxidase, horse radish peroxidase or human leukocyte myeloperoxidase activate the latent collagenase. Pre-incubation of the peroxidase with the inhibitor sodium azide prevents the activation of the latent enzyme via hydrogen peroxide and reduced flutathione. The oxidizing equivalents can also be generated by employing the hydrogen-peroxide-generating system of glucose and glucose oxidase. The peroxidase-catalysed activation by the glucose/glucose oxidase system can be inhibited by including either catalase or glutathione reductase in the activating system. NADH also inhibits the glucose-coupled activation system, but this effect can be counteracted by including NADH peroxidase.
The result indicate that the activation of the latent collagenase can be regulated by the glutathione cycle. The activation could be coupled in vitro to the glucose metabolism via the system glucose/glucose oxidase. Regulation in vitro might perhaps be coupled to the phagocytosis-associated respiratory burst known to be linked to the hexose monophosphate shunt activity of the cell.
In an experiment in vitro, with the concentrations of reduced and oxidized glutathione normally found in vivo, the glutathione cycle could be used either to activate or to inactivate the latent collagenase, depending on the addition of either hydrogen peroxide as oxidizing equivalents or NADPH or NADH as reducing equivalents. This provides the first example in which regulation of proteolyticactivity activity could be linked to the glutathione redox potential of the cell.
TL;DR: The new regular polyhedra, defined and investigated by Branko Grunbaum in this paper, and their n-dimensional generalizations are classified in terms of their symmetry group.
Abstract: The new regular polyhedra, defined and investigated by Branko Grunbaum in [4], and theirn-dimensional generalizations are classified in terms of their symmetry group.
TL;DR: In this article, two-photon absorption was used to ionize H and D atoms in the ionization chamber of a quadrupole mass filter in a crossed atomic-laser beam configuration with sub-Doppler resolution of ∼ 10 GHz.
TL;DR: In this paper, it was shown that high yield, rapid formation of alkynes from vicdibromides is possible using powered potassium hydroxide and catalytic amounts of lipophilic phase transfer catalysts.
01 Jan 1981
TL;DR: The main interest in tilted algebras comes from the fact that any finite dimensional algebra with a faithful indecomposable module and with Auslander-Reiten quiver without oriented cycle is a tilted algebra as discussed by the authors.
Abstract: The finite dimensional algebras of the form End(TA) , where T A is a tilting module, with A a finite dimensional hereditary algebra, are called the tilted algebras. The main interest in tilted algebras comes from the fact that any finite dimensional algebra with a faithful indecomposable module and with Auslander-Reiten quiver without oriented cycle is a tilted algebra. We will recall some properties of tilted algebras in Section 1, but refer for the proofs to [5].
TL;DR: It is suggested that the mean differences between Norwegian and German children in their exercise and cardio-vascular fitness are brought about by a more physically active behavioural pattern of living in Norway.
Abstract: This report gives results of a longitudinal study of two cohorts of school children in Norway and West-Germany. The rate of growth in body size and composition is identical for the two samples, but different for the two sexes, and follows closely the trend of growth which has been found for North-Europeans in general.
01 Jan 1981
TL;DR: Klebsiella pneumoniae is the most important nif plasmid constructed in vivo: Due to the broad host range of RP4 it can be transferred to a large variety of gram negative bacteria (Cannon and Postgate, 1976; Postgate and Krishnapillai, 1977).
Abstract: Klebsiella pneumoniae, a free-living N2-fixing organism, carries the genes for nitrogen fixation (nif) in a cluster on the chromosome (Streicher et al., 1972). By genetic engineering techniques in vivo this chromosomal nif region was transferred to Escherichia coli (Dixon and Postgate, 1972) integrated into the chromosome (Cannon et al., 1974) combined with the E. coli fertility plasmid F (Cannon et al., 1976) and subsequently with the resistance plasmid RP4 (Dixon et al., 1976). Plasmid pRD1 consisting of RP4 and the his nif region of K. pneumoniae is the most important nif plasmid constructed in vivo: Due to the broad host range of RP4 it can be transferred to a large variety of gram negative bacteria (Cannon and Postgate, 1976; Postgate and Krishnapillai, 1977).
TL;DR: In this article, the authors connect the notion of capacity of sets in the theory of symmetric Markov process and Dirichlet forms with tunneling through the boundary of sets.
Abstract: We connect the notion of capacity of sets in the theory of symmetric Markov process and Dirichlet forms with the notion of tunneling through the boundary of sets in quantum mechanics. In particular we show that for diffusion processes the notion appropriate to a boundary without tunneling is more refined than simply capacity zero. We also discuss several examples in ℝd.
TL;DR: In this article, the synthesis of 1R,1R′,2,3,4,5-tetraphenyl-1-silacyclopentadienes I-V, VII, X, XII and XIII is described.
TL;DR: In this article, a finite temperature Monte Carlo simulation of the SU(2) Yang-Mills system on the lattice is used to obtain an estimate of the mass m G of the lowest gluonium state.
TL;DR: The axonal arborization of lateral line efferent neurones of fishes and urodeles is demonstrated using retrogradely transported horseradish peroxidase to demonstrate widespread axonal branching.
TL;DR: In this paper, doppler-free two-photon transitions are induced in nitric oxide with blue, narrowband, tunable radiation generated by a frequency-stabilized cw dye ring laser.
TL;DR: A class E of storage structures which generalizes multidimensional tapes is defined and every t( n)-time bounded Turing machine whose storage structures are in E can be simulated by a t(n) loglog t (n)/log t(N)-space bounded Turing Machine.
TL;DR: In this article, products are conceptualized as bundles of attributes so that consumers' perceptions of existing products and their conceptions of 'ideal' products can be represented as points in an attribute space.
TL;DR: In this article, a Newton iteration process was proposed to solve the inverse eigenvalue problem, which includes the classical additive and multiplicative inverse Eigenvalue problems as special cases.
Abstract: We suppose an inverse eigenvalue problem which includes the classical additive and multiplicative inverse eigenvalue problems as special cases. For the numerical solution of this problem we propose a Newton iteration process and compare it with a known method. Finally we apply it to a numerical example.
TL;DR: Labelling of all fibres innervating individual neuromasts reveals a well-ordered branching pattern of afferents in the CNS and a projection to all termination areas.
TL;DR: Fluorescence of DNA at room temperature in neutral aqueous solution has been observed after excitation by a pulsed dye laser as mentioned in this paper, and maximum emission appears at 352 nm with a quantum yield of 4 × 10 −5.
TL;DR: In this article, the authors consider Ising ferromagnets on random subgraphs of the square lattice and show that at sufficiently low temperatures and zero external field, spontaneous magnetization occurs.
Abstract: We consider Ising ferromagnets on random subgraphs of the square lattice. These are obtained by independent random selections either of sites or of bonds. We assume that for each site (or, respectively, bond) the probability of being selected exceeds the critical percolation probability. Then, at sufficiently low temperatures and zero external field, spontaneous magnetization occurs. Some further related results are obtained.
TL;DR: A sequence of monotone Boolean functions hn:{0, 1}n→{0,1}n, such that the monotones complexity of hn is of order n2/log n is constructed, which includes the largest known lower bound of this kind.