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  • 1
    Electronic Resource
    Electronic Resource
    Electrodeposition of nickel-cobalt-zinc alloys from a borate bath (1981)
    Springer
    Journal of applied electrochemistry 11 (1981), S. 697-701 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrodeposition has been studied of nickel-cobalt-zinc alloys from a borate bath containing nickel sulphate (120–140 g dm−3), cobalt sulphate (30–46 g dm−3), zinc sulphate (144–168 g dm−3), boric acid (30 g dm−3) and ammonium chloride (2 g dm−3). The operating conditions were: current density, 2.0–5.0 A dm−2; temperature, 30–40°C and pH, 2.4 to 5.4. Light grey, semibright, stressed films have been obtained. However, the deposits consist partially of black powder when the concentration of the various components is increased. The brightness is found to increase with decreasing temperature and pH of the solution. The total cathode efficiency increases when the pH and temperature of the solution decrease, whereas at any particular pH and temperature it first decreases, reaches a minimum and then increases with increasing current density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615173
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of intracerebroventricular administration of catecholamines and their antagonists on rectal temperature of Mastomys natalensis (1981)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 318 (1981), S. 38-42 
    Details
    ISSN: 1432-1912
    Keywords: Mastomys natalensis ; α-Adrenoceptors ; β-Adrenoceptors ; DA-receptors ; Thermoregulation ; Thermoneutral zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Noradrenaline (NA), adrenaline (ADR), isoprenaline (ISO) and dopamine (DA) were given through a chronically implanted cannula in the lateral cerebral ventricle of Mastomys natalensis. Low doses of NA (0.05–0.25 μg) reduced rectal temperature while larger doses (0.35 μg upwards) produced dose-dependent hyperthermia. The hypothermic effect was antagonised by α-adrenceptor and the hyperthermia by β-adrenoceptor antagonists. α-Methyl noradrenaline produced less hyperthermia but it antagonised the hyperthermic effect of NA. Adrenaline (0.1–10 μg) was ineffective per se but when given after tolazoline it produced hyperthermia and after propranolol it produced hypothermia. The dose-dependent hyperthermia with isoprenaline (0.1–10 μg) was blocked by propranolol and MJ-1999. Dopamine (0.5–20 μg) and its agonists apomorphine, amantadine and BS 9641 produced hyperthermia which was antagonised by haloperidol and pimozide but not by α- or β-adrenoceptor antagonists. Noradrenaline (1.0 μg) produced hypothermia at ambient temperature of 10°C and 16°C. It had no effect at 20°C which seems to be the thermoneutral zone for mastomys. The hyperthermic effect at 33°C was less than at 24°C. Dopamine (10 μg) response was attenuated at 33°C and unaffected at other ambient temperatures. It is concluded that α- and β-adrenoceptors and DA-receptors exist in the central thermoregulatory mechanism in mastomys. The α-receptors are concerned with lowering the body temperature whereas the β-receptors and DA-receptors are involved in raising it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503310
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  • 3
    Electronic Resource
    Electronic Resource
    On cohomological dimension and the sum theorems (1984)
    Springer
    Acta mathematica hungarica 43 (1984), S. 17-24 
    Details
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01951319
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  • 4
    Electronic Resource
    Electronic Resource
    Phenology of trees in a sub-tropical humid forest in north-eastern India (1982)
    Springer
    Plant ecology 49 (1982), S. 103-109 
    Details
    ISSN: 1573-5052
    Keywords: Humid forest ; India ; Phenology ; Tree
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phenological observations were made on 122 tree species in a subtropical humid seasonal forest in north-eastern India. The forest had a high proportion of evergreen compared to deciduous species. Leaf-fall of most of the tree species coincided with the dry season. Flushing started towards the end of the dry season for a majority of the tree species, the degree and period of leaflessness varying with the species. Leaf production in the overstorey species extended over a longer period compared to the understorey species. For most of the species, flowering coincided with leaflessness. Proportionately more overstorey species flowered during the dry season and wet season flowering was more characteristic of understorey species. A majority of the species produced fleshy fruits during the wet season. Fruits, produced during the dry season, were mostly dry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00052764
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  • 5
    Electronic Resource
    Electronic Resource
    On the anharmonic contribution to the specific heat of monatomic face-centered cubic crystals (1980)
    Springer
    International journal of thermophysics 1 (1980), S. 73-82 
    Details
    ISSN: 1572-9567
    Keywords: Helmholtz free energy ; anharmonic fcc crystal ; specific heat ; perturbation theory ; Brillouin zone sums
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have presented a method for an exact calculation of the two lowest-order, cubic (F 3) and quartic (F 4), perturbation terms in the Helmholtz free energy (F) of an anharmonic crystal in the high temperature limit. The method is applicable to a nearest-neighbor central force model of a monatomic fcc crystal for any phenomenological two-body potential Φ(r). The calculation of F 3 and F 4 requires a knowledge of the six dimensionless Brillouin zone (BZ) sums, as a function of a parameter a 1 depending on the first and second derivatives of Φ(r). These sums are calculated to a high degree of accuracy for a mesh size of 308,000 points in the whole BZ in the range −0.1≤a 1≤+0.1 in steps of 0.02. The linear temperature dependent anharmonic contribution to the specific heat at constant volume, calculated for the elements Pb, Ag, Ni, Cu, Al, Ca, and Sr, from the Morse and Rydberg potentials, is found to be positive in all cases, with the exception of Pb. In this case the Morse potential gives a negative sign. The predictions of theory are in agreement with experiments where the data is available (e.g., Cu, Al, and Pb).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00506273
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  • 6
    Electronic Resource
    Electronic Resource
    Anharmonic effects in the specific heat of aluminum (1980)
    Springer
    International journal of thermophysics 1 (1980), S. 299-315 
    Details
    ISSN: 1572-9567
    Keywords: Helmoltz free energy ; anharmonic aluminum fcc Crystal ; constant pressure and constant volume specific heat ; interionic potentials for aluminum ; equation of state ; perturbation theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific heat at constant pressure, C p , of aluminum has been measured by Leadbetter between 300 and 772 K and by Brooks and Bingham between 330 and 893 K. Both sets of data are converted to the specific heat at constant 0 K volume, C v0, by the Slater-Overton method, based on the equation of state and not the Debye type of theory. Corrections to the work of Overton are given. Our analysis shows that the C v0 obtained from Leadbetter's data remains below 3R up to 750 K, whereas it becomes 〉3R for the Brooks and Bingham data in the temperature range 650–850 K. Calculations of C v0 (harmonic + anharmonic) from three pseudopotentials are reported for (a) Harrison modified point ion potential with Hubbard exchange and correlation factor in the dielectric function, ε(q); (b) Ashcroft pseudopotential with the same ε(q) as in (a); and (c) Dagens-Rasolt-Taylor (DRT) M2 pseudopotential with Geldart-Taylor ε(q). The shape of the C v0 curve is found to be similar for all three potentials. For DRT potential, C v0 reaches 3R at 700 K, whereas the other two barely approach 3R about 900 K. The anharmonic contribution to C v0 is a factor of two larger for the Dagens et al. compared to the other two potentials. There is a marked difference between the C v0 curve from the analysis of the Brooks and Bingham data and the theoretical curves. It appears that the experimental points are too high from about 500 K up. The C v0 curve from Leadbetter's data is very similar to the three theoretical curves, but the results appear to be too low. A remeasurement of the specific heat from 500 K to the melting point is needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00517128
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetic study of Ru(VI)-catalyzed oxidation of cyclic alcohols by hexacyanoferrate(III) in aqueous alkaline medium (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 16 (1984), S. 195-204 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the oxidation of cyclopentanol, cyclohexanol, 2—methylcyclohexanol, and cycloheptanol by hexacyanoferrate(III) ions in mild alkaline medium has been studied in the presence of traces of ruthenium(VI) ≈ 10-7M at constant ionic strength (0.26M). The results suggest that the oxidation of the studied cyclic alcohols proceeds via the formation of a complex between Ru(VI) and the substrate which slowly decomposes, giving the reduced form of ruthenium which was reoxidized to Ru(VI) in a fast step by alkaline hexacyanoferrate(III) ions. The product study shows the production of the corresponding ketone.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550160302
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