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Excited states of the deformable jellium (1990)

Méndez-Moreno, R. M. ; Moreno, M.

American Physical Society

In: Physical Review A. 1990; 41(12): 6662-6667. Published 1990 Jun 01. doi: 10.1103/physreva.41.6662.

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Publikationsdatum: 1990-06-01

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Publiziert von American Physical Society

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Synthesis, characterization, and crystal structure of 1,3,7,9-tetramethylpyrido-[2,3-d∶6,5-d′]-dipyrimidine-2,4,6,8-tetrone (1994)

Enrique-Mirón, C. ; Quirós-Olozábal, M. ; Romero-Molina, M. A. ; [weitere]

Springer

Journal of chemical crystallography 24 (1994), S. 465-468

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ISSN: 1572-8854

Schlagwort(e): Pyrimidine ; uracil ; crystal structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract A new and easy method for the preparation of 1,3,7,9-tetramethylpyrido-[2,3-d∶6,5-d′]-dipyrimidine-2,4,6,8-tetrone is described. The structure of this compound has been solved by means of X-ray diffraction methods. The chemical characterization by spectral (mass, ultraviolet, infrared, and proton nuclear magnetic resonance) and thermal (thermogravimetry and differential scanning calorimetry) method is also reported. The compound is monoclinic, space groupP21/c,a=12.720(5),b=13.688(7),c=8.079(2) Å, β=107.06(4)°,Z=4. The structure consists of discrete tricyclic molecules, stacking playing an important role in crystal packing.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01666096

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3

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X-ray lasers as sources for resonance-fluorescence experiments (1994)

Koch, J. A. ; Lee, R. W. ; Nilsen, J. ; [weitere]

Springer

Applied physics 58 (1994), S. 7-11

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ISSN: 1432-0649

Schlagwort(e): 42.55.Vc ; 32.30.Rj ; 52.70

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We point out that existing Ne-like X-ray lasers have sufficient brightness to be used as pump sources in resonant pump-fluorescence experiments, and we discuss some of the potential benefits and limitations of such experiments. In preliminary experiments, we have measured the line overlap of the Ne-like yttrium X-ray laser near 155 Å with 4f−3d transitions in H-like Na and He-like Mg. These experiments used a high-resolution grating spectrometer, and calibrated the wavelength of the yttrium laser by comparison against lines of known wavelength. The results indicate that the wavelength of the yttrium laser is 154.985 ± 0.025 Å, a factor of 2–4 improvement in precision over previous calibrations. We find that the yttrium laser is ≈ 100 mÅ to the long-wavelength side of both the He-like Mg line and the H-like Na line, so that neither resonance is perfect; however, Stark broadening could improve the overlap in the latter scheme, and bulk Doppler shifting could improve both resonances. We also find a good resonance between the yttrium laser and an un-identified transition which we tentatively attribute to copper.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01081706

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Digitale Medien

Investigation of gain and hyperfine splitting in the niobium X-ray laser (1994)

Moreno, J. C. ; Nilsen, J. ; Koch, J. A. ; [weitere]

Springer

Applied physics 58 (1994), S. 3-5

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ISSN: 1432-0649

Schlagwort(e): 31.30.Gs ; 32.70.Jz

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Neon-like niobium X-ray lasers have been studied using both slab and thin-foil target geometries. Niobium foils of various lengths were irradiated from both sides with two beams of the frequency-doubled Nova laser system using a line focus. We looked for gain by measuring spectrally integrated line intensities at different plasma lengths. Gain was observed in four neon-like niobium lines corresponding to 3s−3p transitions. The line profile of theJ = 0−1 line (λ = 145.9 Å) shows splitting due to the hyperfine effect. Improved contrast in the hyperfine structure is observed as the plasma length is increased. Hyperfine splitting may be relevant to other 3s−3p transitions in neon-like niobium as well as other neon-like X-ray laser systems.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01081705

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Decay rates of sunspot groups from 1874 to 1976 (1990)

Pillet, V. Martinez ; Moreno-Insertis, F. ; Vázquez, M.

Springer

Astrophysics and space science 170 (1990), S. 3-7

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ISSN: 1572-946X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The global behaviour and fine structure of the distribution of sunspot decay rates from activity cycle 13 to 20 are presented. It is shown that the distribution of this parameter is lognormal. Statistically significantly lower values of decay rates are found in cycles 13, 14, and 18 for isolated spots. The complex groups had no appreciable changes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00652636

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6

Digitale Medien

Epichlorohydrin polymerization using diphenylzinc-cocatalyst systems in benzene solution (1990)

Contreras, Jesús M. ; Moreno, Pompilio ; Calcagno, María P. ; [weitere]

Springer

Polymer bulletin 23 (1990), S. 483-489

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary Various diphenylzinc-cocatalyst systems were used as initiators of epichlorohydrin polymerization in benzene solution. Water, acetone, butanone, acetophenone and cyclopentanone were employed as cocatalyst but in the most of the cases diphenylzinc alone produced the better conversion to polymer. GPC results suggest the presence of more than one active species for the polymerization initiated by those systems. For diphenylzinc alone as initiator the reaction at 120°C is first order with respect to monomer with kp=1.21x10 -5L mol-1sec-1.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00419966

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7

Digitale Medien

Active region asymmetry as a result of the rise of magnetic flux tubes (1994)

Moreno-insertis, F. ; Caligari, P. ; Schüssler, M.

Springer

Solar physics 153 (1994), S. 449-452

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ISSN: 1573-093X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The magnetic flux tubes that rise across the convection zone to produce active regions are shown to develop a difference in inclination between their preceding and follower sides. This asymmetry is such that the follower wing is more vertical (i.e., closer to the radial direction) than the preceding side. An asymmetry of this kind can be obtained as a natural consequence of the conservation of angular momentum along the rise. This process may explain a number of the observed asymmetries in morphology and behavior of the preceding and follower parts of the active regions. We present results of numerical simulations showing this effect and discuss possible observational consequences.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00712518

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8

Digitale Medien

Nonmanipulable decision mechanisms for economic environments (1994)

Moreno, Diego

Springer

Social choice and welfare 11 (1994), S. 225-240

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ISSN: 1432-217X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Sociologie , Wirtschaftswissenschaften

Notizen: Abstract In the social choice literature studying the problem of designing institutions for collective decision making, it is customary to (implicitly) assume that each dimension of the social outcome is of public interest (i.e., that each individual's welfare depends on every dimension of the outcome). Thus, the scope of the conclusions obtained is very limited. Here social decision problems with and without that public character are considered and it is shown that the same negative results arise in most cases; namely, that only dictatorial mechanisms are immune to the participants' manipulations. These results are obtained without requiring that the mechanisms produce Pareto optimal outcomes (they must simply be minimally responsive to the participants' preferences), which deepens their pessimistic character.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00193808

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9

Digitale Medien

Lattice-dynamics of the intermediate oxide of tin (1994)

Moreno, M. S. ; Mercader, R. C.

Springer

Hyperfine interactions 83 (1994), S. 415-418

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The lattice-dynamical properties of the intermediate oxide of tin (IO) have been investigated over the temperature range 80–295 K. The logarithm of the recoil-free fraction varied linearly with temperature. However, a Debye model does not give a good account of this dependence. By comparison with the other oxides of the Sn-O system, the recoil-free fraction for tin atoms with 2+ and 4+ oxidation states of the IO were estimated. At room temperature, they are 0.463 and 0.323 for 4+ and 2+ states respectively.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02074310

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10

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Measurement and Interpretation of Spontaneous Line Emission from a Common Upper Level in Laser-Produced Carbon Plasmas (1990)

Huang, Y. W. ; Wang, J. -S. ; Moreno, J. C. ; [weitere]

American Physical Society

In: Physical Review Letters. 1990; 65(21): 2747-2747. Published 1990 Nov 19. doi: 10.1103/physrevlett.65.2747.

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Publikationsdatum: 1990-11-19

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society

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