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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 22 (1983), S. 1607-1610 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 23 (1984), S. 195-206 
    ISSN: 1435-1528
    Keywords: Black coal ; oil ; suspension ; ageing ; power-law model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The rheological study of coal-oil suspensions is very important because of their application in many industries as alternative fuels to petroleum oil. In this work, the flow behaviour of black coal-oil suspension was studied for a range of coal volume fractions from 0.0378 to 0.427. Shear stresses were measured for shear rates up to 200 s−1 using a Weissenberg Rheogoniometer. All the suspensions behaved like non-Newtonian liquids and exhibited significant increases in apparent viscosity on storage. The flow behaviour of both freshly prepared and aged suspensions was able to be described by power-law models. A model similar to that given by Chong was used to establish relation between the relative apparent viscosity and coal volume fraction for freshly prepared as well as all aged suspensions. A correlation was also established between ageing time and maximum coal volume fraction.
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] XLRP is one of the most severe clinical forms of RP, with onset in males in the first decade, progressing to blindness by the third or fourth decade6. Female carriers show a variable but generally mild degree of visual loss, which occurs much later than in males and is associated with ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 347-349 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 shows that control urine samples from unstressed rats produced comparatively little MAO inhibition. Cold immobilization stress increased fivefold the degree of MAO inhibition induced by rat urine, with no concomitant effects on urinary pH or creatinine concentration. Pretreatment of rats ...
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 57 (1984), S. 151-155 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase transitions of nearest-neighbour interacting Ising models on self-avoiding walk (SAW) chains on square and triangular lattices have been studied using Monte Carlo technique. To estimate the transition temperature (T c) bounds, the average number of nearest-neighbours (Z eff) of spins on SAWs have been determined using the computer simulation results, and the percolation thresholds (p c) for site dilution on SAWs have been determined using Monte Carlo methods. We find, for SAWs on square and triangular lattices respectively,Z eff=2.330 and 3.005 (which compare very well with our previous theoretically estimated values) andp c=0.022±0.003 and 0.045±0.005. When put in Bethe-Peierls approximations, the above values ofZ eff givekT c/J〈1.06 and 1.65 for Ising models on SAWs on square and triangular lattices respectively, while, using the semi-empirical relation connecting the Ising modelT c's andp c's for the same lattices, we findkT c/J≳0.57 and 0.78 for the respective models. Using the computer simulation results for the shortest connecting path lengths in SAWs on both kinds of lattices, and integrating the spin correlations on them, we find the susceptibility exponent γ=1.024±0.007, for the model on SAWs on two dimensional lattices.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 309 (1983), S. 325-329 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Volume integrals of the real part of the proton and neutron optical potentials computed using the existing phenomenological analyses forA=12–209 and for a range of nucleon energies (E p =10–180 MeV;E n = 8–150 MeV) have been fitted with an empirical experession. The magnitude and the energy dependence of the isoscalar, the isovector and the Coulomb components of the real part of the potential determined from this empirical procedure agree well with those predicted by the microscopic approach.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 258 (1980), S. 954-959 
    ISSN: 1435-1536
    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: Summary The polymerization of acrylamide initiated by Ce 44+/L-cysteine redox system has been studied at 35 ± 0.2 °C in dark under nitrogen atmosphere. The effect of monomer,L-cysteine, Ce4+ and sulphuric acid concentration and temperature on the rate of polymerization has been studied. The rate may be expressed by the following equation:R p α[M] [Ce4+]0.5 [Cysteine]0.44 The overall energy of activation is 4.78 kcal/deg/mole in the investigated range of temperature 30–50 °C. Molecular weight of the polymer is independent of catalyst concentration but increases with increasing monomer concentration.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 39 (1983), S. 427-428 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The profiles of plasma and ovarian cholesterol altered similarly as a result of seasonal influence. Fish pituitary extract and LH significantly depleted plasma and ovarian free cholesterol only, esterified cholesterol remaining unaltered. Findings indicated that plasma cholesterol was the primary source of sterol for ovarian steroidogenesis.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 313 (1983), S. 99-103 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Volume integrals of the imaginary part of the proton and the neutron optical potentials obtained from the existing phenomenological analyses for the mass number range of 12–209 and for a range of nucleon energies (E p =10–180 MeV,E n =8–150 MeV) have been fitted with an empirical expression. The isoscalar, the isovector and the Coulomb components determined empirically have been compared with those obtained from the microscopic approach. Though there is qualitative agreement between the two predictions, there are differences when compared quantitatively.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 20 (1981), S. 288-298 
    ISSN: 1435-1528
    Keywords: Sewage sludge ; yield-power law model ; pipeline rheometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Die rheologische Untersuchung von Abwasserschlamm ist von Bedeutung für die Planung, den Betrieb und die Überwachung von Abwasser-Kläranlagen. Die rheologischen Eigenschaften hängen aber in starkem Maße von den physikalischen, chemischen und biologischen Kennzeichen des Schlammes ab. Es wird ein Rohrrheometer beschrieben, das für die Messung der rheologischen Eigenschaften von Schlämmen geeignet ist. Frischer Abwasserschlamm ist eine komplexe ausgeflockte Suspension ohne einheitliche Größe, Form, Größenverteilung und Oberflächenbeschaffenheit der Teilchen. Die bisher vorliegenden Kenntnisse über die Rheologie von Abwasserschlämmen sind nicht geeignet für die Erfordernisse der Planung, weil die physiko-chemischen Kenndaten der betreffenden Schlämme fehlen. Frischer und gefaulter Abwasserschlamm sind nicht-newtonsche Systeme und weisen eine Fließgrenze auf. Während frischer Schlamm aber Scherentzähung zeigt, findet man bei Faulschlamm Scherverzähung. Sowohl die Approximation durch eine parabolische Beziehung als auch durch ein Herschel-Bulkley-Modell sind geeignet für die Beschreibung der experimentellen Ergebnisse, die für Schlämme mit verschiedener Konzentration und bei verschiedener Temperatur erhalten wurden. Die Fließspannung von frischem Schlamm hängt exponentiell von der Konzentration und linear von der Temperatur ab, zum mindesten innerhalb des untersuchten kurzen Temperaturintervalls. Frischer Schlamm erweist sich bei kleinen Schubspannungen als anti-thixotrop, wohingegen bei Faulschlamm kein zeitabhängiges Verhalten festzustellen ist.
    Notes: Summary Rheological study of sewage sludge is useful for the design, operation and control of sewage treatment plants. The rheology is highly dependent on physical, chemical and biological characteristics of the sludge. A pipeline rheometer is described in this paper for measurement of rheological properties of the sludge. Primary sewage sludge is a complex flocculated suspension having no fixed particle dimension, shape, size distribution or surface characteristics. The information available so far on rheology of sewage sludge is not suitable for application in design because of the lack of data on physico-chemical characteristics of this sludge. Primary and digested sewage sludge are non-Newtonian in character. Both exhibit yield stress and while primary sludge is shear-thinning in nature, digested sludge has been found to be shear-thickening. Parabolic and yield-power law models have been used to express the experimental data obtained for sludges at various concentrations and temperatures. Yield stress of primary sludge varies exponentially with concentration and linearly with temperature within the short temperature range studied. Primary sludge is found to be antithixotropic at low shear stress. Digested sludge does not exhibit time dependency.
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