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  • 2000-2004  (4)
  • 1965-1969  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Retrieval System for Quality Control Drug Data (1967)
    s.l. : American Chemical Society
    Journal of chemical documentation 7 (1967), S. 240-244 
    Details
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/c160027a011
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microwave transmission through a two-dimensional, isotropic, left-handed metamaterial (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 489-491 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present experimental data, numerical simulations, and analytical transfer-matrix calculations for a two-dimensionally isotropic, left-handed metamaterial (LHM) at X-band microwave frequencies. A LHM is one that has a frequency band with simultaneously negative cursive-epsiloneff(ω) and μeff(ω), thereby having real values of index of refraction and wave vectors, and exhibiting extended wave propagation over that band. Our physical demonstration of a two-dimensional isotropic LHM will now permit experiments to verify some of the explicit predictions of reversed electromagnetic-wave properties including negative index of refraction as analyzed by Veselago [Usp. Fiz. Nauk 92, 517 (1964), Sov. Phys. Usp. 10, 509 (1968)]. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343489
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  • 3
    Electronic Resource
    Electronic Resource
    Direct calculation of permeability and permittivity for a left-handed metamaterial (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2246-2248 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a "left-handed" (LH) propagation band at microwave frequencies. A LH metamaterial is one characterized by material constants—the permeability and permittivity—which are simultaneously negative, a situation never observed in naturally occurring materials or composites. While the presence of the propagation band was shown to be an inherent demonstration of left handedness, actual numerical values for the material constants were not obtained. In the present work, using appropriate averages to define the macroscopic fields, we extract quantitative values for the effective permeability and permittivity from finite-difference simulations using three different approaches. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314884
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  • 4
    Electronic Resource
    Electronic Resource
    Observations on Trapped Electrons and Allyl Radicals Formed in 2-Methylpentene-1 by γ Radiolysis at Low Temperature (1966)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 70 (1966), S. 2379-2383 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100879a047
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Shape effects in plasmon resonance of individual colloidal silver nanoparticles (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 6755-6759 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a systematic study of the effect of size and shape on the spectral response of individual silver nanoparticles. An experimental method has been developed that begins with the detection and characterization of isolated nanoparticles in the optical far field. The plasmon resonance optical spectrum of many individual nanoparticles are then correlated to their size and shape using high-resolution transmission electron microscopy. We find that specific geometrical shapes give distinct spectral responses. In addition, inducing subtle changes in the particles' morphology by heating causes a shift in the individual particle spectrum and provides a simple means of tuning the spectral response to a desired optical wavelength. Improved colloidal preparation methods could potentially lead to homogeneous populations of identical particle shapes and colors. These multicolor colloids could be used as biological labels, surface enhanced Raman scattering substrates, or near field optical microscopy sources covering the full range of wavelengths in the visible spectrum. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1462610
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of eastern hemlock (Tsuga canadensis L.) on fish community structure and function in headwater streams of the Delaware River basin (2003)
    Oxford, UK : Blackwell Science, Ltd
    Ecology of freshwater fish 12 (2003), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract –  Hemlock (Tsuga canadensis) forests of the eastern U.S. are in decline due to invasion by the exotic insect hemlock woolly adelgid (Adelges tsugae). Aquatic biodiversity in hemlock ecosystems has not been documented; thus the true impact of the infestation cannot be assessed. We compared ichthyofaunal assemblages and trophic structure of streams draining hemlock and hardwood forests by sampling first- and second-order streams draining 14 paired hemlock and hardwood stands during base flows in July 1997 at the Delaware Water Gap National Recreation Area of Pennsylvania and New Jersey. Over 1400 fish of 15 species and 7 families were collected, but hemlock and hardwood streams individually harbored only one to four species. Brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) were two to three times as prevalent in hemlock than hardwood streams. Insectivorous fishes occurred in significantly higher proportion in streams of hardwood (0.90) than hemlock (0.46) stands, while piscivores occurred more often in hemlock (0.85) than hardwood (0.54) stands. Functional (trophic) diversity of fishes in hemlock and second-order streams was numerically greater than that of hardwood and first-order streams. Species composition also differed by stream order and terrain type. Biodiversity is threatened at several levels within hemlock ecosystems at risk to the hemlock woolly adelgid in eastern U.S. forests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0633.2003.00006.x
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  • 7
    Electronic Resource
    Electronic Resource
    Nitrogen Fixation by Gunnera–Nostoc Symbiosis (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 1231-1231 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Blue-green algae enter into symbiosis with a variety of plant groups7,8 and for some of these, the phycobiont has been shown to fix nitrogen making it available to the host. It has been assumed8 that the same holds true for Gunnera-Nostoc, although Scott9 speculates that any contribution of fixed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2241231a0
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  • 8
    Electronic Resource
    Electronic Resource
    The tentorial artery: Its diagnostic significance (1969)
    Springer
    Acta neurochirurgica 21 (1969), S. 57-69 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Anatomie, radiographische Darstellung und pathologische Bedeutung der tentoriellen Arterie, die ein Ast der kavernösen Verlaufsstrecke der A. carotis interna ist, werden besprochen. Es werden 18 Patienten mit verbreiterter tentorieller Arterie beschrieben. Es handelte sich dabei mit fast gleicher Häufigkeit um Tentorium-Meningeome (4), maligne Gliome (6) und arteriovenöse Mißbildungen (4). Zusätzlich fand sich ein einzelner Fall, in dem dieses Gefäß ein Akustikusneurinom versorgte; eine solche Beziehung ist bisher noch nicht beschrieben worden. In drei Fällen stand die erweiterte Arterie in keinem erkennbaren Zusammenhang zu der bestehenden Erkrankung.
    Abstract: Résumé Les auteurs ont étudié l'anatomie, la visualisation radiographique et la signification pathologique de l'artère de la tente, branche de la portion caverneuse de la carotide interne. Dix huit patients ont présenté une artère tentorielle élargie: 4 cas de méningiome de la tente, 6 cas de glioblastome, 4 cas d'angiome, 1 cas de neurinome du VIII, vascularisé par l'artère tentorielle (ceci n'a pas été décrit auparavant). Dans les trois derniers cas, l'élargissement de l'artère tentorielle n'était pas formellement en rapport avec la lésion présente.
    Notes: Summary The anatomy, radiographic visualization and pathological significance of the tentorial artery, which is a branch of the cavernous portion of the internal carotid artery, is discussed. Eighteen patients with an enlarged tentorial artery are described. The diagnoses in these patients were almost equally divided among tentorial meningiomas (4), malignant gliomas (6) and arteriovenous malformations (4). In addition there was a single case in which this vessel fed an acoustic neuroma; this relationship has not been previously reported. In three cases the enlarged artery was not recognizably related to the lesion present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01405210
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    Paper (German National Licenses)
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