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  • Electronic Resource  (7)
  • 1985-1989  (4)
  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Canopy structure and productivity of Festuca avundinacea Schreb. swards during vegetative and reproductive growth (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 40 (1985), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Canopy structure, productivity and their relationships were examined in 2-year-old swards of fourteen tall fescue (Festuca arundinacea Schreb.) strains during the vegetative and reproductive growth stages. During the vegetative growth stage morphological characters, particularly tiller size, were closely associated with productivity. Swards with large tillers showed an effective distribution of the incoming light energy within the canopy and hence low extinction coefficient (K) value and high productivity at complete light interception. On the other hand, although there was no apparent correlation between K and the productivity or the whole crop during the reproductive growth stage, the productivities of the reproductive and vegetative tillers were positively and negatively related to K respectively. Leaf area index of the reproductive tillers and their position in the canopy had marked effects on the distribution of the incoming light energy within the canopy and on the productivity of both types of tillers. The productivity of the vegetative and the reproductive tillers is discussed in terms of the effect of the competition for incoming light energy between both types of tillers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1985.tb01719.x
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  • 2
    Electronic Resource
    Electronic Resource
    The closest packing of equal spheres on a spherical surface (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 98-100 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A table is given of putative solutions to the Fejes problem: to find the maximum value of the smallest angular distance between any two of N points movable on the surface of a sphere. Values of N run without omission up to 27 with six sporadic cases thereafter. Some applications of this system as a model are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477000205
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  • 3
    Electronic Resource
    Electronic Resource
    Random packing of equal spheres (reply) (1975)
    [s.l.] : Nature Publishing Group
    Nature 256 (1975), S. 522-522 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] GOTOH AND FINNEY REPLY-We are aware of the numerical closeness of 2/n and 0.6366, but until now had no good nonnumerological reason for asserting its significance. We are grateful to Gamba for pointing out the possible use of integral geometry, and will follow up the The average volume of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/256522a0
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  • 4
    Electronic Resource
    Electronic Resource
    Removal of iron (III) oxide particles from a quartz plate by liquid flow (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 1072-1079 
    Details
    ISSN: 1435-1536
    Keywords: Detergency ; electro-osmosis ; iron (III) oxide ; electrokinetic phenomena ; heterocoagulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The detachment of submicron particles of iron (III) oxide from a quartz plate in aqueous solutions was investigated by using a well-defined flow of electro-osmosis in comparison with the ordinary flow of water without electrokinetic effect. A rectangular quartz cell was used for removal experiments. Zeta potentials of the particles and the plate were determined by electrophoresis and electro-osmosis, respectively. When the iron (III) oxide particles adhering to the quartz plate were removed by the electro-osmotic flow or the ordinary (Poiseuille) flow, the removal efficiency increased with increasing hydrodynamic force. The removal efficiency by electro-osmotic flow was almost the same as that by ordinary flow under the condition of the same magnitude of applied hydrodynamic force. The values of volume flow rate for the removal efficiency of 0.5 for the electro-osmotic flow was extremely small compared with that for the ordinary flow, showing the effectiveness of particle removal by electrokinetic effect of electro-osmosis. The kinetic analysis of the particle removal process showed that it was characterized by two different rate constants, the rate constant of the rapid process and that of the slow process. The rate constant of slow process increased with increasing electro-osmotic velocity. This shows that the electro-osmotic flow acts as a mechanical force to overcome the energy barrier in the removal process. The rate constant increased with increasing surfactant concentration and this trend became more noticeable as electro-osmotic velocity increased. It is concluded from this result that the effect of surfactant on particle removal is enhanced by the mechanical force in removal processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410325
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  • 5
    Electronic Resource
    Electronic Resource
    Triple isotope scintiphotography for differentiating between renal cysts and renal tumors (1976)
    Springer
    International urology and nephrology 8 (1976), S. 11-16 
    Details
    ISSN: 1573-2584
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract As a routine diagnostic approach to patients who present hematuria or abnormal findings in X-ray films such as intravenous pyelograms, the cases are submitted to serial scintiphotography every two minutes after the intravenous administration of 250 μCi of131I-Hippuran and to renography with PHO/GAMMA Scintillation Camera (Nuclear-Chicago). When scintiphotography with131I-Hippuran reveals filling defect in the kidney region, scintiphotography with 150 μCi of203Hg-chlormerodrin and renal blood flow scintiphotography after antecubital intravenous injection of 10 mCi of99mTc are carried out. The present report concerns 8 cases of renal tumor and 5 cases of renal cyst confirmed by X-ray examinations and surgical operation. The scintiphotography revealed decreased uptake of131I-Hippuran and203Hg-chlormerodrin in both tumor and cyst sites, exhibiting round or band-shaped filling defects. On the other hand, renal blood flow scintiphotography with99mTc demonstrated the cyst as a filling defect but failed to visualize most of tumors. Accordingly, these techniques are available for differential diagnosis of the two lesions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081986
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of surface properties of particles on their adhesion and removal (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 434-439 
    Details
    ISSN: 1435-1536
    Keywords: Nylon particle ; adhesion ; removal ; electrokinetic potential ; Hamaker constant ; heterocoagulation ; electrostatic ; van der Waals interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of surface properties of particles on their adhesion and removal was investigated using an immersed system consisting of nylon particles and a quartz plate. The nylon particles were dyed with a reactive dye in order to change their properties and were used for the adhesion and removal experiments in comparison with undyed particles. The electrokinetic potentials of the particles were measured by micro-electrophoresis and the Hamaker constants were independently evaluated using experimental values of dispersive component of surface free energy determined by the Wilhelmy technique. The experimental results were used for the discussion of particle adhesion and removal on the basis of the heterocoagulation theory. The differences in adhesion and removal efficiencies between dyed and undyed particles were explained in terms of the electrostatic and dispersive van der Waals interaction by considering the differences in thier properties, the electrokinetic potential and the Hamaker constant, due to dyeing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410189
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  • 7
    Electronic Resource
    Electronic Resource
    Contact angle hysteresis in carbon fibers studied by wetting force measurements (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 702-706 
    Details
    ISSN: 1435-1536
    Keywords: Contactangle ; carbonfiber ; wettingforce ; surfacefreeenergy ; Augerelectronspectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The surface free energy of polyacrylonitrile carbon fibers was investigated by using the Wilhelmy technique. The difference in surface free energy between immersion and emersion was observed for the carbon fiber pyrolyzed at 2500 °C. In contrast, the hysteresis disappeared with repyrolyzation of the carbon fibers at 3000 °C. Auger electron spectroscopic analysis indicated that the surface of the latter carbon fiber (repyrolyzed at 3000 °C) consisted of the basal planes of graphite. Rough surface topography of the carbon fiber repyrolyzed at 3000 °C, as observed by scanning electron microscope, did not affect the hysteresis. Therefore, the contact angle hysteresis was attributed to the chemical adsorbants on the activation sites of the fiber surfaces, as detected by Auger electron spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01524372
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