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  • 1
    Digitale Medien
    Digitale Medien
    0.4 μm spatial resolution with 1 GHz (λ=30 cm) evanescent microwave probe (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1725-1729 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In this article we describe evanescent field imaging of material nonuniformities with a record resolution of 0.4 μm at 1 GHz (λg/750 000), using a resonant stripline scanning microwave probe. A chemically etched tip is used as a point-like evanescent field emitter and a probe–sample distance modulation is employed to improve the signal-to-noise ratio. Images obtained by evanescent microwave probe, by optical microscope, and by scanning tunneling microscope are presented for comparison. Probe was calibrated to perform quantitative conductivity measurements. The principal factors affecting the ultimate resolution of evanescent microwave probe are also discussed. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149658
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  • 2
    Digitale Medien
    Digitale Medien
    Highly oriented layers of the three-dimensional semiconductor CdTe on the two-dimensional layered semiconductors MoTe2 and WSe2 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5718-5722 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The II–VI semiconductor CdTe was sequentially deposited onto the (0001) van der Waals surfaces of the layered compound semiconductors MoTe2 and WSe2 by molecular beam epitaxy. Growth could only be achieved after deposition of a nucleation layer of CdTe at room temperature. After nucleation subsequent deposition steps followed at increased substrate temperatures (T=170–370 °C) in order to increase the crystalline quality of the films. The deposited films were investigated after each growth step by low energy electron diffraction and photoelectron spectroscopy. The diffraction pattern indicates a facetting of the (111) oriented film surfaces. From photoemission data we exclude interface reactions between substrate and film material. Transmission electron microscopy was used to examine the film morphology after the UHV experiments. The mean diameter of the film crystallites is 200–400 A(ring). © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363624
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  • 3
    Digitale Medien
    Digitale Medien
    Heteroepitaxy of CuInS2 on Si(111) (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3010-3012 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Epitaxial layers of CuInS2 are grown on chemically hydrogen terminated Si(111) surfaces with 4° miscut by molecular beam epitaxy. The morphological and structural properties are determined by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and texture analysis. The data show growth in the 〈112〉 direction and substantial twinning of the 75-nm-thick films. High-resolution cross-sectional micrographs of the interface indicate semicoherent epitaxial growth via an interfacial indium-rich secondary phase. The pronounced faceting of the film surface is discussed in relation to twin lamellae. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116822
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  • 4
    Digitale Medien
    Digitale Medien
    CuAu-type ordering in epitaxial CuInS2 films (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 785-787 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Ordering of Cu and In atoms in near-stoichiometric CuInS2 epitaxial films grown on Si (111) by molecular beam epitaxy was studied by transmission electron microscopy. Nonchalcopyrite ordering of the metal atoms in CuInS2 is observed, which is identified as CuAu-type ordering. Sharp spots in electron diffraction patterns reveal the ordered Cu and In atom planes alternating along the [001] direction over a long range. High-resolution electron microscopy confirms this ordering. The CuAu-ordered structure coexists with the chalcopyrite ordered structure, in agreement with theoretical prediction. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122001
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  • 5
    Digitale Medien
    Digitale Medien
    Transmission electron microscopy investigation and first-principles calculation of the phase stability in epitaxial CuInS2 and CuGaSe2 films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2483-2485 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Ordering of metal atoms in CuInS2 and CuGaSe2 thin films grown by vapor-phase epitaxy on Si (001) and GaAs (001) substrates were studied using transmission electron microscopy and first-principles total energy calculations. Chalcopyrite and CuAu-like orderings of the metal atoms were observed coexisting in CuInS2 films, while only chalcopyrite ordering was found in CuGaSe2 films. First-principles total energy calculations find that the formation enthalpy difference between chalcopyrite and CuAu-like phases of CuInS2 is very small (2 meV/atom), while it is large for CuGaSe2 (9 meV/atom), indicating that the existence of CuAu-like phase in the nominally chalcopyrite semiconductors is controlled by bulk thermodynamics. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123014
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  • 6
    Digitale Medien
    Digitale Medien
    Structure and voltage dependence of ferroelectric properties of SrBi2Ta2O9 thin films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1746-1749 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Polycrystalline SrBi2Ta2O9 (SBT) ferroelectric thin films were synthesized on Pt/Ti/SiO2/Si substrates by the metalorganic decomposition technique. The SBT crystalline phase appeared at 550 °C, completely crystallized at 650 °C, and little pyrochlore phase was observed in the x-ray diffraction patterns. The grains, which are rodlike, increased from about 50 to 200 nm in diameter with increasing annealing temperature from 550 to 800 °C. Typically, the SBT thin film annealed at 750 °C had Pr=8.8 μC/cm2 and Ec=29.3 kV/cm at applied voltage of 5 V, and the hysteresis loops become saturated with an increase of the maximum applied voltage. The fatigue and retention characteristics of SBT thin films dependence on applied voltage and frequency have also been investigated. It revealed that the fatigue endurance at a higher frequency and a higher applied voltage could be better than that at a lower frequency and a lower applied voltage. The retention properties of the SBT thin films are quite good over a range of 1–10 000 S, and the influence of applied voltage and bias voltage is not obvious. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369341
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  • 7
    Digitale Medien
    Digitale Medien
    CARDIOVASCULAR RESPONSE TO EMOTIONAL STRESS AND SPONTANEOUS BLOOD PRESSURE VARIABILITY IN GENETICALLY HYPERTENSIVE RATS OF THE LYON STRAIN (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 15 (1988), S. 0 
    Details
    ISSN: 1440-1681
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: 1. Intra-aortic blood pressure (BP) was continuously recorded in freely moving genetically hypertensive (LH), normotensive (LN) and low BP (LL) rats of the Lyon strains under basal conditions and during aversive stimulation (a jet of air for 20 min). Rats were studied when 5 and 14 weeks old.2. The 24 h standard deviation (i.e., variability) of diastolic BP was significantly greater in LH rats of both ages than in LN and LL control rats.3. In response to the stressor, LH rats showed larger increases in BP than age-matched controls.4. The BP variability was related to the BP responses to stress in the whole series of rats.5. It is concluded that the spontaneous BP variability and the BP responses to an experimental stressor rely upon a common regulatory mechanism in rats and that an increased lability of diastolic BP is a primary characteristic of Lyon hypertensive rats.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1440-1681.1988.tb01111.x
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  • 8
    Digitale Medien
    Digitale Medien
    EVOLUTION WITH AGE OF BAROREFLEX SENSITIVITY ITS AUTONOMIC NERVOUS COMPONENTS IN CONSCIOUS HYPERTENSIVE RATS OF THE LYON STRAIN (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 16 (1989), S. 0 
    Details
    ISSN: 1440-1681
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: 〈list xml:id="l1" style="custom"〉1Cardiac baroreflex sensitivity (BRS) and its sympathetic and vagal components were studied after atropine and propranolol administrations in conscious genetically hypertensive (LH), normotensive (LN) and low blood pressure (LL) rats of the Lyon strain at 5, 9, 13 and 70 weeks of age.2LH rats older than 9 weeks exhibit a lower BRS than age-matched LN and LL controls.3The vagal component of cardiac baroreflex is predominant. In LN rats, this component increases up to 9 weeks of age.4The sympathetic component of cardiac baroreflex is small and identical in the three strains and does not alter with age.5Thus, in normotensive rats, the increase in BRS during maturation reflects mainly the vagal component. The development of hypertension prevents this physiological increase in the sensitivity of the vagal component of cardiac baroreflex leading to a reduced BRS.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1440-1681.1989.tb02998.x
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  • 9
    Digitale Medien
    Digitale Medien
    Coherence effects in plasmon excitation
    Amsterdam : Elsevier
    Ultramicroscopy 28 (1989), S. 47-48 
    Details
    ISSN: 0304-3991
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Allgemeine Naturwissenschaft , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(89)90268-4
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  • 10
    Digitale Medien
    Digitale Medien
    Polymyxin B-horseradish peroxidase conjugates as tools in endotoxin research
    Amsterdam : Elsevier
    Analytical Biochemistry 207 (1992), S. 311-316 
    Details
    ISSN: 0003-2697
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0003-2697(92)90017-2
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