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  • 1
    Electronic Resource
    Electronic Resource
    The high resolution video capture system on the alcator C-Mod tokamak : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 947-950 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new system for routine digitization of video images is presently operating on the Alcator C-Mod tokamak. The PC-based system features high resolution video capture, storage, and retrieval. The captured images are stored temporarily on the PC, but are eventually written to CD. Video is captured from one of five filtered RS-170 CCD cameras at 30 frames per second (fps) with 640×480 pixel resolution. In addition, the system can digitize the output from a filtered Kodak Ektapro EM Digital Camera which captures images at 1000 fps with 239×192 resolution. Present views of this set of cameras include a wide angle and a tangential view of the plasma, two high resolution views of gas puff capillaries embedded in the plasma facing components, and a view of ablating, high speed Li pellets. The system is being used to study (1) the structure and location of visible emissions (including MARFEs) from the main plasma and divertor, (2) asymmetries in gas puff plumes due to flows in the scrape-off layer (SOL), and (3) the tilt and cigar-shaped spatial structure of the Li pellet ablation cloud. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147721
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of the shape function on small-angle scattering analysis by the maximum-entropy method (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 27 (1994), S. 693-702 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Analysis of small-angle scattering data to obtain a particle-size distribution is dependent upon the shape function used to model the scattering. From a maximum-entropy analysis of small-angle scattering data, the effect of shape-function selection on the obtained size distribution is demonstrated using three different shape functions to describe the same scattering data from each of two alloys. The alloys have been revealed by electron microscopy to contain a distribution of randomly oriented and mainly noninteracting irregular ellipsoidal precipitates. A comparison is made between the different forms of the shape function. The effect of an incident-wavelength distribution is also shown. The importance of testing appropriate shape functions and validating these against other microstructural studies is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889894000373
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of small-angle scattering data dominated by multiple scattering for systems containing eccentrically shaped particles or pores (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 27 (1994), S. 878-891 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A previously developed formalism to interpret the beam broadening due to multiple small-angle scattering of a collimated beam of radiation in condensed matter is extended to treat the case of nonspherical scattering particles or pores. The new formalism concerns the situation where coherent single-particle scattering is incoherently, or stochastically, compounded by a random system of spheroidal particles, of any given mean aspect ratio, in a uniform matrix. By appropriate transformation of axes to reflect a spheroidal particle symmetry, Bethe's analysis of scattering when the sample thickness greatly exceeds the scattering mean free path is combined with the dynamical analysis of single-particle scattering to model the beam broadening arising from a system containing nonspherical scattering objects. For the range of experimental parameters used in practical small-angle scattering studies of technological materials such as porous ceramics, it is shown that, while the previous formulation suffices for spheres, globules and even short capillary pores, the variation in beam broadening as a function of incident wavelength exhibits distinguishable signatures for systems in which a collapsed planar or extreme capillary scattering morphology predominates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889894004097
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  • 4
    Electronic Resource
    Electronic Resource
    Time-resolved phenomena in cements, clays and porous rocks (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 624-634 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Small-angle neutron scattering (SANS) provides a powerful tool in the non-destructive characterization of statistically representative microstructures in technologically important disordered materials. While qualitative microstructural models must be provided by other methods such as transmission electron microscopy (TEM), SANS quantifies the microstructural parameters and can characterize scale-invariant (fractal) disordered materials such as cements, clays and porous rocks. H2O/D2O contrast-variation methods have proved particularly useful for investigating the accessibility of different parts of the pore structure and in differentiating between pore-volume access (measured by other methods) and pore-surface accessibility (likely to control sorption and leaching processes). This paper describes SANS studies of disordered porous materials, particularly the hydration of cement and the real-time permeation of water in clay minerals. Other microstructural effects are also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889890012237
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of the closed porosity in plasma-sprayed alumina (1997)
    Springer
    Journal of materials science 32 (1997), S. 3407-3410 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The porous phase of plasma-sprayed alumina was characterized using mercury intrusion porosimetry, water immersion methods, and small-angle neutron scattering. A comparison of the results shows that the intrusion techniques did not yield a full porous phase characterization. It has been found that while the amount of closed porosity was 1.4%(±0.5%) of the sample volume, this volume accounted for only 60% of the total internal surface area. The smallest void diameter was found to be 10 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018616632261
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  • 6
    Electronic Resource
    Electronic Resource
    The Victoria University (1879)
    [s.l.] : Nature Publishing Group
    Nature 20 (1879), S. 76-76 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the article on the Victoria University in the last number of NATURE, I observe some inaccurate statements regarding the Queen's University in Ireland. In the first place there are not four colleges, but three. Next there are no degree examinations in any college, but all are conducted ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/020076a0
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  • 7
    Electronic Resource
    Electronic Resource
    Radioaktive Untersuchungen (1934)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 98 (1934), S. 194-207 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01364400
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  • 8
    Electronic Resource
    Electronic Resource
    A study of ultrafine porosity in hydrated cements using small angle neutron scattering (1985)
    Springer
    Journal of materials science 20 (1985), S. 303-315 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small angle neutron scattering makes use of the neutron contrast due to differences in the scattering power between small, particulate regions and the general background medium, and has only very recently been applied to study the porosity in hydrated cement systems. The technique is applied to pore sizes below approximately 30 nm and produces data on pore size distribution, pore volume and pore shape without recourse to drying techniques and the potential structural degradation which may occur. Results indicate a bi-modal pore size distribution at approximately 5 and 10 nm diameter, with a total volume accounting for some several percent of the total cement block. The best estimate of the 5 nm pore shape is considered to be curved-faced tetrahedra. The pores appear to be relatively unaffected by changes in the water-to-cement ratio or accelerating admixture investigated, but macro defect free cement does show significant pore structure alteration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555924
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  • 9
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    The Tetraneutron (1952)
    American Physical Society
    Details
    Publication Date: 1952-03-01
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Inelastic Scattering of Protons from Nickel (1952)
    American Physical Society
    Details
    Publication Date: 1952-06-15
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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