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  • 1
    Electronic Resource
    Electronic Resource
    Sum rules and fugacity derivatives of classical fluids (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2386-2389 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Equations relating integrals of distribution functions or correlation functions with fugacity derivatives of distribution functions are derived. The corresponding equations in the canonical ensemble are also derived and the system considered is a multicomponent fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455980
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  • 2
    Electronic Resource
    Electronic Resource
    A modified superposition approximation to the three-body distribution function (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 5142-5147 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Based on quite general arguments we propose a simple modification to the Kirkwood superposition approximation. It consists in the replacement of g2(r) by α(r)g2[α(r)r] with α(r)=1+γ/r. This modification is tested against numerical simulations of a Lennard-Jones fluid, and good results are obtained. The γ value seems to be quite independent of the thermodynamic parameters of the system and of the precise functional form of α. Based on short-range universality arguments, we propose γ=0.07 for all simple fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463811
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  • 3
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘A modified superposition approximation to the three-body distribution function' '' [J. Chem. Phys. 99, 5625 (1993)] (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 5627-5628 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A modified Kirkwood superposition approximation (MKSA) is applied to a MC simulation of hard spheres with η=0.27 and is compared to the KSA. The results are good but not as good as in the LJ case. We conclude that, globally speaking, the MKSA is an improvement with respect to the KSA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466222
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  • 4
    Electronic Resource
    Electronic Resource
    Age, growth and reproduction of Aphanius iberus (Cuv. & Val., 1846) in the lower reaches of the Guadalquivir river (south-west Spain) (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 20 (1988), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. Age, growth and reproduction in an Atlantic population of the small fish, Aphanius iberus (Cuv. & Val., 1846), from the estuary of the Guadalquivir river were studied.2. The growth period was from April to September and the annulus on the scales was formed in April.3. The life-span was short with a winter age-structure of 95.9% 0+ fish, 3.9% 1+ and 0.2% 2+.4. The fecundity of this stock, before the beginning of reproduction, is represented by the formula: Fec=0.907 TL (cm)4.099. During the reproductive period 1+ females contained more, smaller eggs g−1 of gonad than 0+ fish.5. Males matured before females, but females were larger than males. The overall sex ratio did not differ from 1:1 but males dominated significantly during most of the spawning period.6. Aphanius iberus spawned intermittently during the reproductive period. From April to July, 1+ group specimens (7–12 months old) reproduced. Their offspring (0+ group; 3–4 months old) reproduced from July to September. Very few of the 1+ group specimens survived to spawn the following year.7. Mean gonadosomatic indices were much higher in the 1+ group than in the 0+ group and in females compared to males.8. The loss of condition and the disappearance of the 1 + group during spawning, may indicate the cost of a prolonged high level of reproductive effort.9. In this productive environment, the life history of Aphanius iberus is similar to that of Gambusia affinis (Baird & Girard, 1853) and Fundulus heteroclitus (Linnaeus) found in the same area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1988.tb00446.x
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamic derivatives of classical distribution functions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 4385-4386 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature and density derivatives of the distribution functions in the canonical ensemble and the temperature and fugacity derivatives in the grand canonical ensemble are evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448835
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  • 6
    Electronic Resource
    Electronic Resource
    Direct correlation function in the 2D one-component plasma at Γ=2 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 2853-2857 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The two-body direct correlation function for the two-dimensional one-component plasma with coupling constant Γ=2 is evaluated. It is analytically shown that its long-range behavior is identical with that of the interaction potential and the remainder is explicitly evaluated in closed form. The dependence of the distribution functions and correlation functions with the size of the system is considered and it is concluded that they are size independent in the thermodynamic limit. The bridge function, which is of interest in the MHNC approximation, is evaluated and discussed in terms of a recent universality ansatz. The relevance of these results for the mean spherical approximation is also pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450312
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  • 7
    Electronic Resource
    Electronic Resource
    Age and growth of yellow eels, Anguilla anguilla, in the estuary of the Guadalquivir river (south-west Spain) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 34 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A total of 1068 eels were examined from a population located in the Guadalquivir river estuary (37°N, 6°25′W). Maximum ages recorded were 4 + (males) and 7+ (females), and maximum lengths were 39-1 cm (males) and 54.1 cm (females). No growth was recorded between November and April, most occurring in May and, to a lesser extent, in June-October. Females grew to be larger than males. A classification analysis, based on 17 different European eel populations revealed that populations in brackish waters grew faster than those in fresh waters, but latitude also had an influence. Length-weight relationships obtained for three eel categories (males, females and undifferentiated) were used to estimate relative condition: condition cycles were similar between sexes, with increases in autumn and decreases in winter. There were monthly fluctuations in the sex ratio, and females dominated significantly in the combined catch (234 males/276 females).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03335.x
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  • 8
    Electronic Resource
    Electronic Resource
    Age, growth and reproduction of the barbel, Barbus sclateri (Günther, 1868), in a first-order stream in southern Spain (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 33 (1988), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: This study was based on examination of 1476 barbels from a first-order stream located in the Guadalquivir River basin (38°N, 4°43′W). This stock comprised nine age groups of male and 11 of females. No growth was recorded between October and March, most occurring in April–June and, to a lesser extent, in July–September. A classification analysis revealed that this stock had the lowest growth rate of 37 different European barbel populations. Length–weight relationships were obtained for 12 barbel categories and used to estimate both condition and instantaneous growth rate. Relative condition (before and after subtracting gonad weight) was similar in both sexes and was affected by gonad growth and environmental summer conditions.Spawning occurred during the second half of May (15 May is suggested as the birthday). Gonads began to develop in September (females) and in February (males). Males matured at between 7 and 9 cm fork length (f.l.) (2–4 years old) and females between 11 and 16 cm (6–7 years). The fecundity of this stock was represented by the formula F=6.07 10 4 f.l. (mm)3.0667. Larger and older fish showed a higher fecundity and bigger eggs. The overall sex ratio did not differ from 1:1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1988.tb05479.x
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  • 9
    Electronic Resource
    Electronic Resource
    Feeding preference in juveniles of Acipenser naccarii Bonaparte 1836 (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of applied ichthyology 18 (2002), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2002.00424.x
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  • 10
    Electronic Resource
    Electronic Resource
    Some meristic characteristics of hybrids between Acipenser naccarii and Acipenser baerii. (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 15 (1999), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The aim of this study was to describe meristic characters of hybrid Acipenser naccarii×A. baeri, to be used as the basis for characterizing hybrid specimens in a complementary manner to as described for,4. naccarii by Hernando et al. (1999). Thirty 2+ and 3+ year class individuals from the Region of Lombardy (Italy) were analysed for eight morphological variables (Soljan 1975; Holcick et al. 1989), and weight. Three indices, viz the relative position of barbels (CA), the ratio of snout width to length (FB) (Garrido-Ramos et al. 1997), and the Soljan index (Hernando et al. 1999), were used to characterize hybrids.A descriptive analyses of variables, simple and multiple regression analysis, and principal components relationships, were calculated. The relationships between Tl and the indices was described using a stepwise multiple regression analysis: Tl=33.32 - 0.26 CA + 10.49 FB + 74.45 SOU (F=1.96; Df = 3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1999.tb00206.x
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