9,575 research outputs found
Harder Jonsson and Roberto Germains
No full textHarder Jonsson standing behind a circus pony in front of a circus tent circa 1945. Roberto Germains from Chapman's Circus is on the left left whilst a child is seated on the horse. Rider and horse trainer, Roberto Germains was an Italian born equestrian, horse trainer and later ringmaster, (b.1917 d.1994) who had a long and varied circus career
Existential prime convex Jonsson theories and their models
No full textThis article is devoted to the study of the model - theoretic properties of special subclasses of Jonsson theories and their classes of models. Namely, introduce a new class of Jonsson theories is existentially prime convex Jonsson theories. The notion of convexity of theory was previously known, it was introduced by A.Robinson. The notion of existential simplicity introduced by the author of this article. Both conditions form a broad natural classes of theories. Thus two natural restrictions on Jonsson define a new class of theories with rich model - theoretic properties. Besides defined formulation of the problem, which define a new direction in the study Jonsson theories
Sjøørretovervåking i bekker langs Skagerrakkysten, Situasjonen 2004
No full textJonsson, B. og Jonsson, N. 2005. Sjøørretovervåkning i bekker langs Skagerrakkysten: Situasjonen i 2004. - NINA Rapport 24. 14 s.© Norsk institutt for naturforskning Publikasjonen kan siteres fritt med kildeangivels
Mangani-pargasite, NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, a new mineral species of the amphibole supergroup
No full textMangani-pargasite, ideally NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, is a new mineral species of the calcium amphibole subgroup of the amphibole supergroup. The type specimen was found on the mine dump of the Långban Fe-Mn-(Ba-As-Pb-Sb) deposit in Värmland, Sweden. Crystal chemical analyses resulted in the empirical chemical formula: A(Na0.90Pb0.07K0.03)Σ1.00B(Ca1.93Mn2+0.07)Σ2.00C(Mg4.25Mn3+0.39Al0.26 Fe3+0.10)Σ5.00T(Si6.35Al1.65)Σ8.00O22W(OH)2. In order to complete the description of this newly approved (IMA 2018-151) mineral we report here additional data to those published in papers by Jonsson and Hålenius (2010) and Hålenius and Bosi (2012). Mangani-pargasite is biaxial positive, with a=1.635(5), b=1.645(5), g=1.660(5) and the measured optic angle 2V is 85(5)°. The dispersion is weak (r>v), and the optic orientation is: Y||b; Z^c=25(3)°. Mangani-pargasite is red to brownish red with weak pleochroism; X=pale reddish brown, Y=pale reddish brown and Z=pale brownish red; X≈Y>Z. The unit-cell parameters are a=9.9448(5), b=18.0171(9), c=5.2829(3) Å, b=105.445(3)°, V=912.39(9) Å3, Z=2, space group C2/m. The ten strongest reflections in the X-ray powder diffraction pattern [d-values in Å, I, (h k l)] are: 8.420, 29, (110); 3.368, 17, (131), 3.279, 49, (240); 3.141, 100, (310); 2.817, 44, (33 0); 2.698, 21, (151); 2.389, 18, (350); 1.904, 29, (510); 1.650, 22, (461) and 1.448, 46, (661)
J.N. Stokland, J. Siitonen and B.G. Jonsson, Biodiversity in Dead Wood (Cambridge, UK: Cambridge University Press, 2012)
No full textA review of the book by J.N. Stokland, J. Siitonen and B.G. Jonsson entitled "Biodiversity in Dead Wood" (Cambridge, UK: Cambridge University Press, 2012
Genetic association between methyl-CpG binding protein 2 (MECP2) and primary Sjögren's syndrome
No full textBeth L Cobb, Yiping Fei, Roland Jonsson, Anne Isine Bolstad, Johan G Brun, Maureen Rischmueller, Susan E Lester, Torsten Witte, Gabor Illei, Michael Brennan, Simon Bowman, Kathy L Moser, John B Harley, Amr H Sawalh
Nonlinear Output Regulation: Exploring Non-Minimum Phase Systems
No full textThis paper investigates a few issues related to the problem of
robust output regulation of nonlinear non-minimimum
phase systems. In order to cope with (unstructured) parametric
uncertainties we insist on well-known high-gain design principles
which, however, are integrated with robust zero-assignment
procedures to handle possible unstable zero dynamics
Numerical Simulation of the Kinetics of Radical Decay in Single-Pulse High-Energy Electron-Irradiated Polymer Aqueous Solutions
No full textA new method for the numerical simulation of the radiation chemistry of aqueous polymer solutions is introduced. The method makes use of a deterministic approach combining the conventional homogeneous radiation chemistry of water with the chemistry of polymer radicals and other macromolecular species. The method is applied on single-pulse irradiations of aqueous polymer solutions. The speciation of macromolecular species accounts for the variations in the number of alkyl radicals per chain, molecular weight, and number of internal loops (as a consequence of an intramolecular radical-radical combination). In the simulations, the initial polymer molecular weight, polymer concentration, and dose per pulse (function of pulse length and dose rate during the pulse) were systematically varied. In total, 54 different conditions were simulated. The results are well in line with the available experimental data for similar systems. At a low polymer concentration and a high dose per pulse, the kinetics of radical decay is quite complex for the competition between intra- and intermolecular radical-radical reactions, whereas at a low dose per pulse the kinetics is purely second-order. The simulations demonstrate the limitations of the polymer in scavenging all the radicals generated by water radiolysis when irradiated at a low polymer concentration and a high dose per pulse. They also show that the radical decay of lower-molecular-weight chains is faster and to a larger extent dominated by intermolecular radical-radical reactions, thus explaining the mechanism behind the experimentally observed narrowing of molecular weight distributions
- …
