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  • 1995-1999  (4)
  • 1990-1994  (9)
  • 1965-1969  (19)
  • 1
    Electronic Resource
    Electronic Resource
    A metal-oxide-semiconductor field-effect transistor with a 20-nm channel length (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2493-2495 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated a Si metal-oxide-semiconductor field-effect transistor with a 20-nm channel length using a novel step/edge technique. An Al gate is evaporated onto a step in the SiO2 gate oxide. A second Al gate, separated from the first by a plasma-enhanced chemical-vapor-deposited SiO2 layer, provides inversion layer extensions of the source and drain contacts. Electrical conductance measurements indicate a channel length approximately equal to the fabricated gate length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346512
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Improved circular polarizer for far-infrared lightpipe systems (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 5559-5562 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present an improved design for far-infrared (FIR) circular polarizers used in a lightpipe transmission system for magneto-optical experiments. A peak efficiency of nearly 100% is achieved for FIR laser radiation by reducing the multiple reflections within the polarizer system, as well as scattering from the walls of the lightpipe. Broadband low-resolution measurements are less susceptible to errors due to multiple reflections, but incorporation of these improvements is still found to reduce systematic errors due to the reflection from the sample. Also, we have measured the low temperature index of refraction of quartz and find significant disagreement with published values for frequencies below 100 cm−1. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146084
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sub-μm, planarized, Nb-AlOx-Nb Josephson process for 125 mm wafers developed in partnership with Si technology (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2609-2611 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have demonstrated a new planarized all-refractory technology for low Tc superconductivity (PARTS). With the exception of the Nb-AlOx-Nb trilayer preparation, the processing is done almost exclusively within an advanced Si technology fabrication facility. This approach has allowed us to leverage highly off of existing state-of-the-art lithography, metal etching, materials deposition, and planarization capabilities. Using chemical-mechanical polish as the planarization technique we have fabricated Josephson junctions ranging in size from 0.5–100 μm2. Junction quality is excellent with the figure of merit Vm typically exceeding 70 mV. PARTS has yielded fully functional integrated Josephson devices including magnetometers, gradiometers, and soliton oscillators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106405
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  • 4
    Electronic Resource
    Electronic Resource
    Compatibility of TPD/polycarbonate blends by carbon-13-proton HETCOR in the solid state (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 1060-1064 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00057a028
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogen atom positions in manganous formate dihydrate and a rerefinement of copper formate dihydrate (1968)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 24 (1968), S. 1312-1316 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056774086800422X
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic Code: The ‘Nonsense’ Triplets for Chain Termination and their Suppression (1965)
    [s.l.] : Nature Publishing Group
    Nature 206 (1965), S. 994-998 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE nucleotide sequence of messenger RNA is a code determining the amino-acid sequences of proteins. Although the biochemical apparatus which translates the code is elaborate, it is likely that the code itself is simple and consists of non-overlapping nueleotide triplets. In general, each ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/206994a0
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  • 7
    Electronic Resource
    Electronic Resource
    Tritium-labelled Peptide Hormones with High Specific Radioactivity (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 876-877 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207876a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Radio emission of fast cosmic ions (1969)
    Springer
    Astrophysics and space science 3 (1969), S. 448-463 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is usually assumed that the ions of cosmic rays contribute nothing to the observable electromagnetic radiation. However, this is true only when these ions are moving in a vacuum or a quiet (nonturbulent) plasma. In the case of fast ions in a turbulent plasma, there is an effective nonlinear mechanism of radiation which is discussed in this paper. The fast ion (relativistic or nonrelativistic) moving in the plasma creates a polarization cloud around itself which also moves with the particles. The turbulent plasma waves may scatter on the moving electric field of this polarization cloud. In the process of this scattering an electromagnetic wave with frequency (2.7) is generated. Let ω1 and k1 be the frequency and wave vector of turbulent plasma waves,V is the velocity of the ion, and ϱ is the angle between the wave vector of electromagnetic radiation and the direction of the ion velocity. The method of calculating the probability of the conversion of plasma waves (k1) into electromagnetic waves (k) by scattering on an ion with velocityV is described in detal in Section 2 (Equation (2.14)). The spectral coefficients of spontaneous radiation in the case of scattering of plasma waves on polarization clouds created by fast nonrelativistic ions are given in (3.6) for an ion energy distribution function (3.4) and in (3.8) for more general evaluations. The Equations (3.9)–(3.13) describe the spectral coefficients of spontaneous emission for different modes of plasma turbulence (Langmuir (3.9), electron cyclotron in a weak (3.10) or strong (3.11) magnetic field and ion acoustic (3.12)–(3.13) waves). The coefficients of reabsorption or induced emission are given by Equations (3.14) and (3.16)–(3.19). There is a maser effect in the case of scattering of plasma waves on a stream of ions. The effective temperature of the spontaneous emission is given by Equation (3.15). The spectral coefficients of radiation due to scattering of plasma waves on relativistic ions are calculated in the same manner (Equations (4.14)–(4.15)). The total energy loss due to this radiation is given in Equations (4.23)–(4.25). The coefficients of induced emission are given in (4.26)–(4.28). The results are discussed in Section 5. It is shown that the loss of energy by nonlinear plasma radiation is much smaller than the ionization loss. However, the coefficients of synchrotron radiation of electrons and nonlinear radiation of ions under cosmic conditions may be comparable in the case of a weak magnetic field and fairly low frequencies (5.5)–(5.6). Usually the spectrum of nonlinear plasma radiation is steeper than in the case of synchroton radiation. Equation (5.10) gives the condition for nonlinear radiation to prevail over thermal radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653365
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Long-Term Administration of Methotrexate on Bone Mineral Density in Rheumatoid Arthritis (1999)
    Springer
    Calcified tissue international 64 (1999), S. 100-101 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Methotrexate — Bone loss — Rheumatoid arthritis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Because previous studies of high-dose methotrexate usage have demonstrated an effect on bone formation and resorption, this study was done to determine whether long-term, low-dose use of methotrexate for the treatment of rheumatoid arthritis causes bone loss. Bone mineral density (BMD) of the lumbar spine and hip was measured in 10 Caucasian postmenopausal women who had never received methotrexate and 10 Caucasian postmenopausal women who had received the drug for 3 or more years. There were no significant differences in BMD at the lumbar spine (L2–L4) between patients who had used long-term methotrexate compared with patients never treated with methotrexate (1.08 ± 0.08 g/cm2 versus 0.98 ± 0.14 g/cm2, respectively; P= 0.08). Similarly, there were no significant differences in BMD at the femoral neck between methotrexate users and nonusers (0.81 ± 0.08 g/cm2 versus 0.76 ± 0.15 g/cm2, respectively; P= 0.42). These results suggest that long-term low-dose methotrexate treatment for rheumatoid arthritis is not associated with accelerated bone loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900585
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  • 10
    Electronic Resource
    Electronic Resource
    Human chorionic somato-mammotropin (HCS), proposed terminology for designation of a placental hormone (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 1288-1288 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird vorgeschlagen, dass das von verschiedenen Forschern als «human placental lactogen», «chorionic growth hormone prolactin», «purified placental protein (human)» usw. bezeichnete plazentare Hormon «chorionic somato-mammotropin (HCS)» benannt wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02146676
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