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  • Articles: DFG German National Licenses  (25)
  • 1990-1994  (25)
  • 1
    Electronic Resource
    Electronic Resource
    Critical scattering from erbium : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5341-5343 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron scattering techniques have been used to measure the nature of the phase transition in erbium at TN=87 K from paramagnetism to an incommensurate longitudinally ordered phase with q=0.283 along c at TN. A high-purity crystal showed normal critical scattering in the paramagnetic state with a different correlation length in the basal plane and along c. It is found that γ=0.96±0.06 and both correlation lengths diverge with the same critical exponent ν=0.49±0.02 for a range of reduced temperature from 0.0015 to 0.07. In the ordered state, power-law behavior was observed with β=0.48±0.02 for reduced temperatures between 0.005 and 0.04. Below TN the intensity of the third harmonic varied as the cube of the reduced temperature. All these observations correspond to mean-field behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353720
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic phase transitions in UNi2Si2 : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4807-4809 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report neutron diffraction measurements on a single crystal of UNi2 Si2. Three magnetically ordering phases are observed below 123 K with the magnetic moment parallel to the c-axis in all three phases. The low temperature (T〈53 K) phase is a superposition of a commensurate spin density wave with wave vector q = (0 0 0.667±0.002) and a ferromagnetic ordered moment of 1.1±0.3μB, the intermediate (53 K〈T〈103 K) is a simple body-centered tetragonal antiferromagnet with an ordered magnetic moment of 1.8±0.2μB and the high-temperature phase is an incommensurate spin density wave with wave vector q = (0 0 0.744±0.002) at 110 K. The phase transitions at 53 and 103 K are first order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348237
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic excitations in CePd2Si2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5203-5205 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of inelastic neutron scattering measurements on a single crystal of CePd2Si2 are presented. A broad magnetic contribution was observed near 20 meV at 20 K. Two different models were used to analyze this response: a single crystal-field excitation with a slightly Q-dependent energy, and two nearly degenerate crystal-field excitations without dispersion. In both cases the excitations have an appreciable intrinsic width due to the strong coupling between the 4f electrons of Ce and the conduction electrons. It is remarkable that, despite the presence of this strong coupling, the reduction of the Ce moment to 0.66μB at 4.2 K seems to be solely due to crystal-field effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344662
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetism in a chromium jarosite Kagomé lattice KCr3 (OH)6 (SO4)2 (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5658-5658 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The S=3/2 magnetic Cr3+ ions in KCr3 (OH)6 (SO4)2 form a quasi-two-dimensional Kagomé lattice. Susceptibility measurements show a Curie–Weiss temperature of −70 K but specific heat data show a peak at 1.8 K. This depression of the ordering temperature is a result of the extreme frustration of the Kagomé lattice. The change in entropy up to 2.8 K is 0.15 K ln 4. Neutron scattering measurements on a powder specimen put an upper limit of 1 μB on the long-range ordered moments. Constant energy inelastic neutron scattering data with energy transfers of 1.0 and 1.4 meV show a broad peak centered at about 1 A(ring)−1 indicative of strong spin fluctuations at both 0.3 and 10 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353631
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  • 5
    Electronic Resource
    Electronic Resource
    The effects of poloxalene on ingestion by cattle grazing Lucerne (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 47 (1992), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The mechanisms that terminate meals of cattle grazing lucerne (Medicago sativa L.) are not well defined. Sub-acute bloat may lead to cessation of grazing and, consequently, surface active substances used in the treatment and prevention of bloat, such as poloxalene, may extend grazing meals and increase herbage intake. Twelve mature Angus cows (Bos taurus) were offered 0, 12·5 and 25·0 g poloxalene in 0·5 kg of crushed maize (Zea mays L.) kernels each day, immediately before two consecutive 1-h measured parts of a grazing meal on 21- to 24-day-old lucerne swards with a herbage dry matter (DM) mass (〉 5 cm) of 2·03 t ha−1 and herbage DM mass allowance of 3·55 kg hd−1h−1. Total herbage DM intake was 2·52 kg hd−1 during the first hour and 1·54 kg hd−1 during the second hour of the 2-h grazing meal. Differences in herbage intake were attributable to a cessation of grazing. Mean rates of biting were 26·3 and 14·8 bites min−1 and mean DM intakes per bite were 1·82 and 4·38 g during the first and second part of meals, respectively. Poloxalene treatments caused a small linear decline in grazing time during the first part of meals and a larger increase in grazing time during the second part of meals. Lower rates of DM intake caused by poloxalene were offset by increases in grazing time. It was concluded that poloxalene moderated ingestive behaviour within grazing meals of immature lucerne and this response may have been at least partly due to the relief of sub-acute bloat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1992.tb02261.x
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  • 6
    Electronic Resource
    Electronic Resource
    Moderation of ingestive behaviour of beef ca le by grazing-induced changes in lucerne swards (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 45 (1990), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Intensive grazing of pastures may cause drastic and rapid changes in swards which have major effects on ingestive behaviour and diet. Twelve adult Angus cows (Bos Taurus), mean live weight of 482±19 kg, were allowed to graze on swards of lucerne (Medicago sativa L.) that were not grazed (TO), or had been grazed previously for 1 h (T1), or 2 h (T2) in a balanced changeover design. Herbage dry ma er (DM) masses (〉5 cm) were 2611, 1895 and 1441 kg ha−1; leaf fractions were 0-48, 0-29 and 0-14; and herbage DM allowances per animal were 10·6, 7·9 and 6·0 kg h−1 for TO, T1 and T2, respectively. During a 1 h measured grazing session that followed an overnight fast, cows ingested 2-93, 1·71 and 0·66 kg DM h−1 with herbage DM intakes per bite of 1·6, 0·9 and 0·4 g for T0, T1. and T2, respectively. Rates of biting did not respond to sward treatment and averaged 30 bites min−1. Intake of leaf DM was estimated at 98, 70 and 6% of total DM intake for the same treatment sequence. Utilization of herbage allowance was 0·29, 0·23 and 0·12, for TO, T1 and T2, respectively. Metabolzable energy (ME) intake per animal was 30, 17 and 5 MJ h−1 and ME intake per bite was 16, 9 and 3 KJ for TO, T1 and T2, respectively. Data show that grazing-induced differences in sward characteristics moderate both ingestive behaviour and diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1990.tb02194.x
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance studies of guest species in clathrate hydrates: line-shape anisotropies, chemical shifts, and the determination of cage occupancy ratios and hydration numbers (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 157-162 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100364a024
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  • 8
    Electronic Resource
    Electronic Resource
    Diastereoselective reactions of tungsten .eta.2-propargyl complexes with alkyl halides and aldehydes (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 3771-3775 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00036a028
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  • 9
    Electronic Resource
    Electronic Resource
    Monte Carlo simulations of CsMnBr3 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5421-5423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Monte Carlo simulations of the magnetic Hamiltonian of CsMnBr3, an XY antiferromagnet on a simple-hexagonal lattice, have been carried in order to examine the phase diagram in an applied magnetic field and the recently discovered tetracritical point. Results on a 12×12×12 lattice reproduce the observed phase diagram. Application of a magnetic field in the ab plane splits the zero-field transition into two transitions. The structures of the two phases are also in agreement with the measurements. Simulations of lattices with a larger number of spins along the c axis reveal a substantial renormalization of the Néel temperature due to the quasi-one-dimensional nature of the Hamiltonian.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344576
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  • 10
    Electronic Resource
    Electronic Resource
    Threshold studies of gravel size particles under the co-linear combined action of waves and currents (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 41 (1994), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Gravel size sediment beds are tested under the combined influence of simulated wave action and co-linear currents in a laboratory flume. Critical current speed, at threshold, increases with increasing size. Superimposed wave energy causes a small reduction in the unidirectional current energy. For low values of wave-induced near bed current velocities, the resistance to erosion increases when the wave period decreases from 10 to 6 s. Finally, combined critical shear stresses are found to be lower than those predicted using the Shields curve, as modified for oscillatory flow. Grain protrusion is suggested as a mechanism to explain this divergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1994.tb01434.x
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