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  • 2000-2004  (4)
  • 1975-1979  (6)
  • 1970-1974  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Domain wall trapping in controlled submicron ferromagnetic elements (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4727-4729 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The domain configuration in permalloy wires (30 nm thick, 10 μm wide, and 205 μm long) with a wide size range of a narrow central bridge (5 μm long and w μm wide; 0.5≤w≤10 μm) were investigated in both their demagnetized and remanent states using magnetic force microscopy and the results were confirmed by micromagnetic calculations. At the bridge region, domain walls were found to be shifted by a small external field. Scanning magneto-optical Kerr effect revealed that the coercivity in these structures are the same as that in a straight wire, suggesting that domain wall movement is the dominant process in the magnetization reversal of these structures. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.373140
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  • 2
    Digitale Medien
    Digitale Medien
    Micromagnetism in mesoscopic epitaxial Fe dot arrays (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7019-7021 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 μm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 μm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to "collapse" into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372917
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  • 3
    Digitale Medien
    Digitale Medien
    Domain nucleation processes in mesoscopic Ni80Fe20 wire junctions (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3032-3036 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetization reversal process in permalloy (Ni80Fe20) wire junction structures has been investigated using magnetoresistance (MR) measurements and scanning Kerr microscopy. A combination of electron beam lithography and a lift-off process has been utilized to fabricate wires consisting of two 200 μm length regions with distinct widths w1 and w2 in the range 1–5 μm. Longitudinal MR measurements and magneto-optic Kerr effect hysteresis loops demonstrate that the magnetization reversal of the complete structure is predominantly determined by the wider region for fields applied parallel to the wire axis. Magnetic force microscopy and micromagnetic calculations show that several domain walls nucleate in the wider part and are trapped in the junction area. This implies that domain nucleation at the junction of the wire initiates magnetization reversal in the narrow half. As a consequence, the switching fields are found to be identical in both halves in this case. These results suggest the possibility of designing structures which can be used to "launch" reverse domains in narrow wires within a controlled field range. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372295
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  • 4
    Digitale Medien
    Digitale Medien
    WATER BINDING OF MACROMOLECULES DETERMINED BY PULSED NMR (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Pulsed NMR was applied to measure the spin-lattice (T1) and the spin-spin (T1) relaxation times of the water adsorbed on sodium alginate, pectin, corn starch, casein and cellulose. T1 was determined by means of repeated 90°-90° pulse sequences and T2 by the spin-echo method. T1 relaxation time curves for all the samples studied showed simple exponential, i.e., single phase, behavior. Plots of T1 as a function of moisture content showed minima at 0.15–0.258 water/g dry matter; plots of T1 vs water activity (Aw) yielded minima at Aw of 0.65. T2 relaxation time curves for corn starch containing more than 0.56g water/g DM exhibited two-phase behavior, indicating the existence of two water fractions of different mobility. The amount of water in the bound fraction showed a remarkable consistency (0.194 ± 0.011g water/g DM) among six samples of high moisture content. T2 was found to increase with moisture content for all the macromolecules. Cellulose showed exceptionally long T2 values compared to the other materials at the same moisture content, whereas pectin and sodium alginate showed short T2 values. These results indicated that T2 value is a measure of strength of water binding. Break points were observed in the T2-moisture curve. The moisture contents at these points corresponded to the bound water content determined by freezing and to the equilibrium moisture content at Aw of 0.9. T2 increased exponentially with Aw.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1976.tb00604.x
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  • 5
    Digitale Medien
    Digitale Medien
    WATER BINDING OF FOOD CONSTITUENTS AS, DETERMINED BY NMR, FREEZING, SORPTION AND DEHYDRATION (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The water binding properties of some common food constituents were determined by water sorption, dehydration, freezing and NMR methods. The sorption isotherms of sodium alginate, pectin, corn starch, casein and cellulose were obtained and the heats of adsorption and monolayer values were calculated. The unfreezable water contents of these five materials were determined and the values corresponded to the equilibrium moisture contents at a water activity of about 0.90. The bound water capacities of 14 food materials were determined using wide-line NMR. These values correlated closely with the tertiary moisture contents determined by a drying rate study and the equilibrium moisture contents at 100% relative humidity. The different NMR properties of free and bound water were discussed in terms of nuclear relaxation times and molecular mobilities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb03483.x
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  • 6
    Digitale Medien
    Digitale Medien
    1,3,5-Trinitrobenzene-N-methylanilide complex (1974)
    s.l. : American Chemical Society
    The @journal of organic chemistry 39 (1974), S. 272-273 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00916a045
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  • 7
    Digitale Medien
    Digitale Medien
    PULSED NUCLEAR MAGNETIC RESONANCE STUDY OF WATER MOBILITY IN FLOUR DOUGHS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Transverse relaxation time (T2) of water protons in wheat flour doughs, an indication of molecular mobility of water, was determined by pulsed nuclear magnetic resonance. The relaxation curves consist of two components with a long and a short T2, corresponding to a more mobile and a less mobile fraction, respectively. The less mobile fraction has a T2 of about 20 msec and accounts for about 0.62g water per g dry solid. These values seem to be independent of flour strength and mixing time. The more mobile fraction increased with moisture content and showed T, value of about 60 msec for most samples. Mixing and addition of salt to the dough resulted in reduced T2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb06449.x
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  • 8
    Digitale Medien
    Digitale Medien
    Effects of ethanol on turnover and function of striatal dopamine (1979)
    Springer
    Psychopharmacology 61 (1979), S. 1-9 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Ethanol ; Dopamine turnover ; Striatum ; Body turning ; Supersensitivity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Acute oral administration of ethanol increased the rate of depletion of dopamine in the striata of rats injected with α-methyl-p-tyrosine. This effect was eliminated by pretreatment with atropine or by lesioning of the striato-nigral tract. Ethanol also attenuated the inhibitory effect of apomorphine on turnover of striatal dopamine. Unilateral injection of ethanol into the neostriatum of rats followed by intraperitoneal injection of either apomorphine or amphetamine elicited marked ipsilateral head-to-tail body turning. This turning was blocked by pretreatment with haloperidol. Chronic intubation of ethanol to rats enhanced contralateral body turning elicited by unilateral intrastriatal injection of dopamine. Injection of 6-hydroxydopamine into the substantia nigra led to denervation supersensitivity of dopaminergic functions in the neostriatum. This effect was not seen in rats that were given ethanol postinjection of 6-hydroxydopamine. These results suggested that ethanol has an inhibitory effect on the nigrostriatal dopaminergic system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00426801
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  • 9
    Digitale Medien
    Digitale Medien
    Mapping quantitative and qualitative disease resistance genes in a doubled haploid population of barley (Hordeum vulgare) (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 580-589 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Barley ; Genome mapping ; Stripe rust ; Leaf rust ; BYDV ; Resistance Gene Analog Polymorphism ; QTL
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  Stripe rust, leaf rust, and Barley Yellow Dwarf Virus (BYDV) are important diseases of barley (Hordeum vulgare L). Using 94 doubled-haploid lines (DH) from the cross of Shyri x Galena, multiple disease phenotype datasets, and a 99-marker linkage map, we determined the number, genome location, and effects of genes conferring resistance to these diseases. We also mapped Resistance Gene Analog Polymorphism (RGAP) loci, based on degenerate motifs of cloned disease resistance genes, in the same population. Leaf rust resistance was determined by a single gene on chromosome 1 (7H). QTLs on chromosomes 2 (2H), 3 (3H), 5 (1H), and 6 (6H) were the principal determinants of resistance to stripe rust. Two- locus QTL interactions were significant determinants of resistance to this disease. Resistance to the MAV and PAV serotypes of BYDV was determined by coincident QTLs on chromosomes 1 (7H), 4 (4H), and 5 (1H). QTL interactions were not significant for BYDV resistance. The associations of molecular markers with qualitative and quantitative disease resistance loci will be a useful information for marker-assisted selection.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220051519
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  • 10
    Digitale Medien
    Digitale Medien
    Anisotropic transport scattering times for pure and dilute aluminium alloys (1975)
    Springer
    The European physical journal 19 (1975), S. 317-322 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The ideal transport scattering times for pure Al are calculated and found to be very anisotropic. The anisotropy is a sensitive function of temperature. It is due to the Fermi surface, the multi-plane-wave character of the electronic wavefunctions, the Umklapp processes, as well as the phonon spectrum. In addition, for a magnesium impurity in Al we have computed the residual transport scattering times as well as the quasiparticle lifetimes which we then compare. The scattering time anisotropy gives rise to deviations from Matthiessen's rule in dilute alloys.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01458879
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