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  • Artikel: DFG Deutsche Nationallizenzen  (27)
  • 1995-1999  (27)
  • 1999  (27)
Datenquelle
  • Artikel: DFG Deutsche Nationallizenzen  (27)
Materialart
Erscheinungszeitraum
  • 1995-1999  (27)
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Oblique collision of modified Korteweg–de Vries ion-acoustic solitons (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3466-3470 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Two-dimensional propagation and oblique collision of modified Korteweg–de Vries (mKdV) ion-acoustic solitons in a plasma with negative ions have been investigated experimentally. At a critical concentration of negative ions, both compressive and rarefractive mKdV solitons exhibit a resonance interaction at a particular amplitude when the colliding angle is fixed. The amplitude is found to be equal for both compressive and rarefractive solitons. The collided solitons suffer a positive phase shift during the interaction. The new solitons formed during the resonant interaction are found to obey the energy and momentum conservation laws of the mKdV solitons for three-wave interaction. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.873607
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  • 2
    Digitale Medien
    Digitale Medien
    A dusty double plasma device (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2345-2348 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A novel dusty plasma device to create spatially and temporally uniform steady state dusty plasma is described. An ultrasonic vibrator is used to vibrate a dust dispenser which disperses the dust uniformly through a fine mesh. A dusty plasma of large dimension with controllable dust density is produced. Measured dusty plasma parameters are compared with existing theories. Some experimental results related to propagation characteristics of dust-ion-acoustic waves in a dusty plasma column are presented. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149761
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  • 3
    Digitale Medien
    Digitale Medien
    Initial long-pulse plasma heating at reduced power with negative-ion-based neutral beam injector in large helical device (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4260-4265 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We have achieved long-pulse plasma heating using a negative-ion-based neutral beam injector (NBI) in the large helical device (LHD), where the confinement magnetic field is generated by only external superconducting coils. In the initial long-pulse experiments at lower power than that in short-pulse experiments, 80 keV–1.1 MW NBI heating lasted for 10 s with a little increase in the plasma density at the pulse end. Almost steady-state plasma heating was achieved for 21 s with 66 keV–0.6 MW NB injection. Plasma relaxation oscillation phenomena at a period of 1–2 s were also observed for 20 s. Above 1 keV plasma was easily sustained with a long-pulse NBI heating in LHD, without the current drive nor the disruption in tokamaks. Negative ion source operation was stable and the cooling water temperature rise of beam accelerator grids was nearly saturated with a temperature rise below 10 °C. For a higher power injection, the pulse duration is determined by the beam blocking, where the reionization loss is exponentially increased together with an increase in outgas in the injection port. The port conditioning by a careful repetition of injection is effective to the extension of the injection duration and the plasma maintenance duration. The initial long-pulse NBI heating at the reduced power has demonstrated an ability of steady-state operation in superconducting LHD. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150063
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  • 4
    Digitale Medien
    Digitale Medien
    Metallic resistively coupled single-electron transistor (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 132-134 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have fabricated and measured transport properties of resistively coupled single-electron transistors (R-SETs). In our version, a chromium thin-film resistive strip served as a gate and was connected directly to a mesoscopic island formed between two ultrasmall Al/AlOx/Al tunnel junctions. In current–voltage-gate voltage dependences of the R-SETs, a characteristic Coulomb blockade pattern was observed. Our simulations based on the orthodox theory of single-electron tunneling are in good qualitative agreement with the experimental data and indicate excessive electron temperature of the devices. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122973
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  • 5
    Digitale Medien
    Digitale Medien
    Single-electron memory using carrier traps in a silicon nitride layer (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3555-3557 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A single-electron memory that utilizes carrier traps in a silicon nitride layer is proposed and experimentally demonstrated. The proposed device consists of an insulating three-layered memory node structure formed on a silicon substrate and a highly sensitive aluminum single-electron transistor that detects the written information. Successful memory operation is demonstrated with two types of write modes (slow/rapid) that depend on the state of the Si channel underneath. Carrier retention time is estimated to be around 45 min. Possibilities for both destructive and nondestructive readout are discussed. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.124159
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  • 6
    Digitale Medien
    Digitale Medien
    Purification and characterization of nitrate reductase from nodule cytosol of soybean plants (1999)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 105 (1999), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Nodulated soybean (Glycine max [L.] Merr.) plants were grown in a nitrogen-free liquid culture medium prepared with distilled water. The cytosol fraction from root nodules showed a significant level of NADH-dependent nitrate reductase activity, even when the root did not show activity. This nitrate reductase was purified by column chromatography and native polyacrylamide gel electrophoresis (PAGE). The purified protein showed a main band at 100 kDa on sodium dodecyl sulfate (SDS)-PAGE. The Km value for nitrate was 0.16 mM, and the highest activity was obtained at around pH 7.5. These characteristics are very similar to the inducible type of nitrate reductase, previously purified from soybean leaves. The developmental change in activity of this enzyme corresponded to that in nitrogenase activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1399-3054.1999.105302.x
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  • 7
    Digitale Medien
    Digitale Medien
    Coherent control of macroscopic quantum states in a single-Cooper-pair box (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 398 (1999), S. 786-788 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A nanometre-scale superconducting electrode connected to a reservoir via a Josephson junction constitutes an artificial two-level electronic system: a single-Cooper-pair box. The two levels consist of charge states (differing by 2e, where e is the electronic charge) that are coupled by ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/19718
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetic studies of thermally treated Re–Fe (Re = Nd, Gd, and Tb) mixed oxides (1999)
    Springer
    Applied physics 69 (1999), S. 63-67 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 76.30Kg; 76.60Jx
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract. Magnetic susceptibility, X-ray diffraction and 57Fe Mössbauer measurements have been made on Re–Fe (Re = Nd, Gd, and Tb) mixed Oxides. The mixed oxides of Re–Fe were prepared in different atomic ratios and annealed at various temperatures. The temperature dependence of magnetic susceptibility shows a broad transition around liquid-nitrogen temperature for Nd–Fe mixed oxides. It is attributed to change in the direction of antiferromagnetic moment for the NdFeO3 as the temperature is lowered. The iron-rich samples have additional transition around 260 K indicative of the αFe2O3 phase. Samples annealed at 550 °C show relatively large magnetic susceptibilities characteristic of a fine particle size. In Nd–Fe (1:1) mixed oxides Mössbauer spectra show one six-line pattern, suggesting one crystallographic site of iron ions. TN observed from the Mössbauer and susceptibility measurements for Nd–Fe (1:1) composition closely agree each other.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390050972
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  • 9
    Digitale Medien
    Digitale Medien
    A Coherent Two-Level System in a Superconducting Single-Electron Transistor Observed Through Photon-Assisted Cooper-Pair Tunneling (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 799-806 
    Details
    ISSN: 1572-9605
    Schlagwort(e): energy-level splitting ; photon-assisted Cooper-pair tunneling ; superconducting single-electron box ; superconducting single-electron transistor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A coherent two-level system can be constructed in an ultrasmall Josephson-junction circuit, where two charge states are coupled by single Cooper-pair tunneling. To investigate coherence and decoherence in the two-level system, we have measured dc current through a voltage-biased superconducting single-electron transistor. Under microwave irradiation, a current due to photon-assisted Cooper-pair tunneling is induced, which serves as a useful experimental tool for spectroscopic study of the energy levels in the two-level system. We observed energy-level splitting, which is evidence of the coherent superposition of the two charge states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007793228293
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  • 10
    Digitale Medien
    Digitale Medien
    Mapping of a gene for May-Hegglin anomaly to chromosome 22q (1999)
    Springer
    Human genetics 〈Berlin〉 105 (1999), S. 379-383 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. May-Hegglin anomaly (MHA) is a rare autosomal dominant platelet disorder characterized by the triad of giant platelets, thrombocytopenia and leukocyte inclusions. Both the molecular and the genetic defects responsible for this disorder remain unknown. In order to map the gene responsible for MHA, we performed a genome-wide linkage study using highly polymorphic short tandem repeat markers in a single Japanese MHA family. Significant linkage was obtained for the markers on the long arm of chromosome 22 (22q12.3–q13.2), with a maximum two-point lod score of 4.52 at a recombination fraction of 0.00 for the markers D22S1142 and D22S277. Haplotype analysis mapped a critical region for the disease locus to a 13.6-centimorgan region, between D22S280 and D22S272. The relative proximity of the platelet GPIb β gene (22q11.2) to this region, as well as its involvement in an isolated giant platelet disorder, suggested a possible involvement of GPIb β mutations in MHA. However, DNA-sequencing analysis in two patients revealed no abnormality in the sequence of the GPIb β gene. This is the first report of linkage for MHA, and further analysis of this locus may lead to the identification of a gene the product of which regulates platelet and leukocyte morphology.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004399900132
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