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  • Electronic Resource  (62)
  • 2000-2004  (30)
  • 1960-1964  (32)
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  • Electronic Resource  (62)
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  • 1
    Electronic Resource
    Electronic Resource
    Ultrafast electron optics: Propagation dynamics of femtosecond electron packets (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1643-1648 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved electron diffraction harbors great promise for resolving the fastest chemical processes with atomic level detail. The main obstacles to achieving this real-time view of a chemical reaction are associated with delivering short electron pulses with sufficient electron density to the sample. In this article, the propagation dynamics of femtosecond electron packets in the drift region of a photoelectron gun are investigated with an N-body numerical simulation and mean-field model. It is found that space-charge effects can broaden the electron pulse to many times its original length and generate many eV of kinetic energy bandwidth in only a few nanoseconds. There is excellent agreement between the N-body simulation and the mean-field model for both space-charge induced temporal and kinetic energy distribution broadening. The numerical simulation also shows that the redistribution of electrons inside the packet results in changes to the pulse envelope and the development of a spatially linear axial velocity distribution. These results are important for (or have the potential to impact on) the interpretation of time-resolved electron diffraction experiments and can be used in the design of photoelectron guns and streak tubes with temporal resolution of several hundred femtoseconds. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1487437
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  • 2
    Electronic Resource
    Electronic Resource
    Modification of high mode pedestal instabilities in the DIII-D tokamak (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1976-1983 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The amplitude and frequency of modes driven in the edge region of tokamak high mode (H-mode) discharges [type I edge-localized modes (ELMs)] are shown to depend on the discharge shape. The measured pressure gradient threshold for instability and its scaling with discharge shape are compared with predictions from ideal magnetohydrodynamic theory for low toroidal mode number (n) instabilities driven by pressure gradient and current density and good agreement is found. Reductions in mode amplitude are observed in discharge shapes with either high squareness or low triangularity where the stability threshold in the edge pressure gradient is predicted to be reduced and the most unstable mode is expected to have higher values of n. The importance of access to the ballooning mode second stability regime is demonstrated through the changes in the ELM character that occur when second regime access is not available. An edge stability model is presented that predicts that there is a threshold value of n for second regime access and that the most unstable mode has n near this threshold. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874053
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  • 3
    Electronic Resource
    Electronic Resource
    Polymeric nanostructured material for high-density three-dimensional optical memory storage (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5328-5334 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The unique properties of a polymer photonic crystal are examined with respect to applications as a medium for high-density three-dimensional optical data storage media. The nanocomposite material was produced from core-shell latex particles, in which the latex cores contained dye-labeled polymer. Nonfluorescent latex shells were attached to the core particles. Upon annealing, the close-packed core-shell particles formed a nanostructured material with the fluorescent particles periodically embedded into the optically inert matrix in a hexagonal close-packed structure. A two-photon laser scanning microscope was used to write bits of information into the material by photobleaching the optically sensitive particles and, under much lower fluence, read out the resulting image. Relative to conventional homogeneous storage media, the nanostructured periodic material is shown to increase the effective optical storage density by at least a factor of 2 by spatially localizing the optically active region and imposing an optically inactive barrier to cross-talk between bits. This polymer photonic crystal has the potential to dramatically improve performance further through the improved capabilities to optimize the photochemical processes and more fully exploiting the periodic nature of the information domains in the image processing. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1406547
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  • 4
    Electronic Resource
    Electronic Resource
    Metamorphism of the deepest exposed arc rocks in the Cretaceous to Paleogene Cascades belt, Washington: evidence for large-scale vertical motion in a continental arc (2003)
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 21 (2003), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Swakane Gneiss and the overlying Napeequa Complex in the North Cascade range, Washington, were metamorphosed and deformed during development of a Cretaceous-Paleogene continental arc, and are among the structurally deepest exposed rocks within the Cordilleran arcs of North America. Peak metamorphic conditions in both the Swakane Gneiss and Napeequa Complex were c. 640–750 °C, 9–12 kbar. Clockwise paths and widespread evidence for high-P metamorphism in meta-supracrustal rocks (burial to 〉40 km) document major vertical tectonic motion during arc construction and unroofing.These and other moderately high-pressure rocks in the North Cascades-Coast Mountains experienced a dramatically different tectonometamorphic history than metamorphic rocks within other Cordilleran arcs. The exhumed arc complexes of the Sierra Nevada and Peninsular Ranges are dominated by relatively low-P metamorphic and plutonic rocks (typically 〈6 kbar). There is no evidence that the northern Cordillera was thickened to a greater degree than these other belts, suggesting that the greater magnitude of vertical motion in the Cascades may have been related to exhumation mechanisms: Eocene extension in the northern Cordillera vs. erosional unroofing in the central and southern Cordillera.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1525-1314.2003.00437.x
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluation of interarch space for implant restorations in edentulous patients: A laboratory technique (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of prosthodontics 9 (2000), S. 0 
    Details
    ISSN: 1532-849X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This article describes a laboratory procedure for the visual evaluation of interarch space and its effect on implant prosthesis design. The method is applicable to patients presenting with completely edentulous arches. Silicone impression material is used to form a resilient cast and an external mold from an existing denture. The denture is duplicated using autopolymerizing acrylic resin. The duplicate denture and resilient cast are mounted on an articulator. Spatial relationships of anatomic landmarks can be evaluated, and a quantitative evaluation of available space can be made. The duplicate denture can also be used as a surgical template to direct implant placement. Reference tables are provided to serve as guidelines in the correlation between available space and minimum space required for various implant-assisted restorations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1532-849X.2000.00102.x
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  • 6
    Electronic Resource
    Electronic Resource
    The Sunflower Forest: Ecological Restoration and the New Communion with Nature (2004)
    Oxford, UK; Malden, USA : Blackwell Science Inc
    Restoration ecology 12 (2004), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1061-2971.2004.012002.x
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  • 7
    Electronic Resource
    Electronic Resource
    FORESTRY AND AERIAL PHOTOGRAPHS (1963)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 4 (1963), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The author describes the responsibilities of the forester both for the production of timber and the preservation of natural resources, and shows how aerial photographs can assist in supplying the information required for organising the management of forest areas. On limited experience with infrared and colour films, the author compares them with panchromatic film for aerial photography of forest country; he considers that in most cases good definition is the most desirable quality in such photographs, although special contrast effects may be useful for particular purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.1963.tb00357.x
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  • 8
    Electronic Resource
    Electronic Resource
    No correlation between aggregates of Cu/Zn superoxide dismutase and cell death in familial amyotrophic lateral sclerosis (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 82 (2002), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aggregates of Cu/Zn superoxide dismutase (SOD) have been demonstrated in familial amyotrophic lateral sclerosis (FALS) and other neurodegenerative diseases; however, their role in disease pathogenesis is unclear. In this study, we investigated the presence of SOD aggregates in nerve growth factor (NGF)-differentiated PC12 cells and cell viability following: (i) transduction with replication-deficient recombinant adenoviruses (AdVs) expressing wild-type SOD (SODWT) or mutant SOD (SODMT, V148G or A4V); (ii) transfection of yellow fluorescent protein-tagged SODWT (SODWT-YFP) or SODMT (SODA4V-YFP, SODV148G-YFP). SOD aggregates were more prominent in cells following transduction of AdSODMT than AdSODWT and following treatment with H2O2, suggesting that mutant SOD leads to oxidation of cellular components. In addition, cells expressing SODMT-YFP yielded SOD aggregates that were significantly larger and more frequent than SOD aggregates in cells expressing SODWT-YFP. Proteasome inhibitors, but not cathepsin B inhibitors, increased aggregate formation but did not increase cell death. In addition, treatments that increased cell viability did not significantly decrease SOD aggregates. Taken together, our data demonstrate that there is no association between SOD aggregates and cell death in FALS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2002.01056.x
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  • 9
    Electronic Resource
    Electronic Resource
    Plant Protein Constituents, Hydroxyproline Content of Seed Meals and Distribution of the Amino Acid in Kernel, Seed Coat, and Pericarp (1961)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 9 (1961), S. 433-435 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60118a006
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  • 10
    Electronic Resource
    Electronic Resource
    A Quantum Theoretical Study of Some N-Heteroaromatic Compounds1 (1962)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 84 (1962), S. 4623-4627 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00883a002
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