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  • 2000-2004  (1)
  • 1985-1989  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Neighborly Cubical Polytopes (2000)
    Springer
    Discrete & computational geometry 24 (2000), S. 325-344 
    Details
    ISSN: 1432-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. Neighborly cubical polytopes exist: for any n≥ d≥ 2r+2 , there is a cubical convex d -polytope C d n whose r -skeleton is combinatorially equivalent to that of the n -dimensional cube. This solves a problem of Babson, Billera, and Chan. Kalai conjectured that the boundary $\partial C_d^n$ of a neighborly cubical polytope C d n maximizes the f -vector among all cubical (d-1) -spheres with 2 n vertices. While we show that this is true for polytopal spheres if n≤ d+1 , we also give a counterexample for d=4 and n=6 . Further, the existence of neighborly cubical polytopes shows that the graph of the n -dimensional cube, where n\ge5 , is ``dimensionally ambiguous'' in the sense of Grünbaum. We also show that the graph of the 5 -cube is ``strongly 4 -ambiguous.'' In the special case d=4 , neighborly cubical polytopes have f 3 =(f 0 /4) log 2 (f 0 /4) vertices, so the facet—vertex ratio f 3 /f 0 is not bounded; this solves a problem of Kalai, Perles, and Stanley studied by Jockusch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004540010039
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of Liquid Foods by the Thermal Comparator Method (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The thermal comparator is shown to be a rapid, accurate method for determining the thermal conductivity of liquid foods. Increasing solids content decreased thermal conductivity for apple juice concentrate, orange juice concentrate, and milk samples. Equations for predicting the thermal conductivity of apple juice, orange juice, and milk are shown to be specific for each commodity. A comparison of apple juice and orange juice suggests that qualitative attributes of the solids fraction as well as the quantity present are important in determining thermal conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb10499.x
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship of Water Content to Textural Characteristics, Water Activity, and Thermal Conductivity of Some Commercial Sausages (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 52 (1987), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mechanical properties from cyclic low strain testing, texture profile parameters and thermal conductivity were evaluated for 7 types of commercial sausage products ranging in moisture content from 27.7% to 62.4% and aw from 0.857 to 0.993. Hardness, fracturability, the apparent moduli, stress al 20% compression, mechanical hysteresis loss, and strain energy all increased with decreasing moisture level, while springiness and the degree of elasticity decreased. Moisture had no significant effect on cohesiveness. A linear relationship was observed between the aw and the effective mole fraction of water in the brine, the exact nature of which depended on the thermal process which the product had received. Thermal conductivity decreased with decreasing moisture in a linear manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1987.tb14238.x
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of Mass Diffusivity of Simple Sugars in Water by the Rotating Disk Method (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 52 (1987), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The rotating disk method is shown to be an accurate method for determining the mass diffusivity of solid food components in liquid solutions. The diffusivities of sucrose and glucose in water were determined to be 0.50 and 0.66 (m2/sec × 109) at 25°C with activation energies of 36.3 and 31.6 kJ/g-mol, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1987.tb06655.x
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and detection of alignment with high ||m|| selectivity by saturated laser optical pumping in molecular beams (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 286-302 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We describe a technique for preparation of molecules in single ||m|| levels involving saturated laser optical pumping on molecular P, R, and Q transitions. This technique is not limited to small rotational quantum numbers j. It allows the determination of the populations of ||m|| levels for arbitrary distribution functions f ( j,m) or alternatively, the determination of all moments of f ( j,m). In principle, this method is able to completely determine the angular distribution of j vectors. Experimental verification of the high ||m||-state purity achieved in Na2 supersonic beams, as well as of inherent limitations due to hyperfine interaction is provided. For illustration, experimental data on laser-induced alignment, the dependence of the flow induced molecular alignment, and on Δm-propensity rules in differential rotationally inelastic scattering are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451655
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  • 6
    Electronic Resource
    Electronic Resource
    Branchings in rooted graphs and the diameter of greedoids (1988)
    Springer
    Combinatorica 8 (1988), S. 217-234 
    Details
    ISSN: 1439-6912
    Keywords: 05 B 35 ; 05 c 20 ; 68 Q 20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract LetG be a 2-connected rooted graph of rankr andA, B two (rooted) spanning trees ofG We show that the maximum number of exchanges of leaves that can be required to transformA intoB isr 2−r+1 (r〉0). This answers a question by L. Lovász. There is a natural reformulation of this problem in the theory ofgreedoids, which asks for the maximum diameter of the basis graph of a 2-connected branching greedcid of rankr. Greedoids are finite accessible set systems satisfying the matroid exchange axiom. Their theory provides both language and conceptual framework for the proof. However, it is shown that for general 2-connected greedoids (not necessarily constructed from branchings in rooted graphs) the maximum diameter is 2r−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02122803
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  • 7
    Electronic Resource
    Electronic Resource
    Intravertebral vacuum phenomenon in multiple myeloma (1987)
    Springer
    Clinical rheumatology 6 (1987), S. 597-599 
    Details
    ISSN: 1434-9949
    Keywords: Multiple Myeloma ; Osteonecrosis ; Spine ; Radiotherapy ; Vacuum Phenomenon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Authors report one case of intravertebral vacuum phenomenon associated with a multiple myeloma. Initially, there occurred a collapse and a lysis of the L4 vertebral body. Two months later, after chemotherapy and cobalt-therapy, X-ray examination showed a vacuum cleft phenomenon within the body of L4 and a backward displacement of the L4 posterior wall. At the same time the patient complained of a cruralgia. Recovery occurred after decompression surgery. Histologic sampling of the L4 vertebral body revealed bone necrosis without any abnormal plasmocytosis. Authors draw attention to the neurological complications occurring in the course of the vertebral necrosis and to the fact that, even in case of multiple myeloma, the occurrence of a transverse vacuum cleft may result from osteonecrosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02330600
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  • 8
    Electronic Resource
    Electronic Resource
    Relationships between processing, microstructure and properties of dense and reaction-bonded silicon nitride (1987)
    Springer
    Journal of materials science 22 (1987), S. 3041-3086 
    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: Abstracts Some aspects of processing, microstructure and properties of the various types of silicon nitride are discussed. Special emphasis is placed on the relationships between powder properties, process conditions, densification and microstructure, as well as the interdependence between microstructure and properties. After summarizing the areas of crystal structure and thermodynamic properties, and processing of the different types of Si3N4, the state-of-the-art of dense and reaction-bonded silicon nitride is given. For both types the formation mechanisms and microstructure, relationships between powder properties, additives (in the case of dense Si3N4), process conditions, and densification and microstructure, as well as data and microstructural effects of various mechanical, thermal and thermo-mechanical properties, are outlined. Advanced processing techniques, such as sintering, gas-pressure sintering, post-sintering, and the different routes of hot-isostatic pressing (starting with powder compacts, reaction-bonded Si3N4 or pre-sintered Si3N4 and the resulting properties, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161167
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  • 9
    Electronic Resource
    Electronic Resource
    Analytical problems with ceramic materials (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 333 (1989), S. 360-372 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Mechanical, physical and chemical properties of ceramic materials are strongly dependent on the microstructure. Thus, the optimization of the microstructure plays a key role for a further improvement of advanced ceramics. The basis of microstructural optimization of ceramics is the relationship between processing, microstructure and properties. In these three fields, at present, extreme demands are put on microstructural characterization of ceramic materials. Microstructural characterization implies, besides the stereometric parameters, the analysis of the chemical composition and structure of the phases present in the material which in many cases have dimensions on an atomic level. In this paper the need for microanalytical characterization of advanced ceramics is pointed out from the materials point of view. Particularly, three topics are discussed: problems and development lines in the field of advanced ceramics, consequences for analytical investigations which are deduced from these problems, and typical examples of analytical problems, and efforts to solve these problems by applying different analytical methods. These topics will be discussed based on examples of highstrength and high-temperature ceramic materials, monolithic ceramics and ceramics composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572328
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of vibrational bond stretching on rotational inelastic electron-molecule scattering (1988)
    Springer
    The European physical journal 10 (1988), S. 247-252 
    Details
    ISSN: 1434-6079
    Keywords: 34.50.Ez ; 34.50.Pi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections for state-to-state rotationally inelastic electron-Na2 scattering, with the molecule being in the vibrational levelv′'=31, are measured at a collision energy of 150 eV. Angular momentum transfer of up to Δj=26 is observed, which is even more than previously obtained for the vibrational ground statev′'=0. Good agreement is found with theoretical results from a spectator scattering model. This work, in general, elucidates the role of vibrational excitation in collision dynamics under vibrationally sudden conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384859
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