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  • Norepinephrine  (1)
  • Scaling  (1)
  • compressibility  (1)
  • equation of state  (1)
  • 1
    ISSN: 1432-1440
    Keywords: Adrenergic system ; Norepinephrine ; Renal failure ; CAPD ; Haemodialysis ; Renal transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Blood pressure as well as noradrenaline, creatinine and electrolytes in blood and urine were compared in normal controls (n=25), patients with chronic renal failure (n=39), patients with continuous ambulatory peritoneal dialysis (CAPD) (n=28) and haemodialysis patients before and after renal transplantation (n=63). The average blood pressures of the control group and the CAPD patients were lower than those of the renal failure patients without and with haemodialysis. After renal transplantation elevated blood pressure normalised in 18% within the following 6 months. In all groups of patients with renal failure the mean noradrenaline plasma concentration was increased more than three-fold of normal values: 1,470 pg/ml in patients with chronic renal failure, 1,366 pg/ml in CAPD patients and 1,284 pg/ml in patients with haemodialysis. No correlation was found between these elevated noradrenaline plasma levels and blood pressure. However, there was a significant correlation between noradrenaline excretion and sodium excretion. Compared to the controls, the urine excretion of noradrenaline was significantly lower in patients with chronic renal failure and almost zero in patients with dialysis treatment. Two days after renal transplantation the mean noradrenaline urine excretion increased to 15.7±1.8 µg/day and 4 days after transplantation the noradrenaline plasma concentration decreased to 592±155 pg/ml. Nine months after renal transplantation the creatinine clearance was 76 ml/min and the mean noradrenaline plasma concentration 438±153 pg/ml. It is concluded that in chronic renal failure the level of noradrenaline plasma concentration is dependant on renal function.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 72 (1987), S. 291-295 
    ISSN: 1432-2234
    Keywords: Polymer-Brownian dynamics ; Scaling ; Parallel processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The LCAP (loosely coupled array of processors) parallel processing systems developed at IBM Kingston have been employed in the simulation of Brownian dynamics on ring polymers. Significant speedups over the serial version of the FORTRAN code have been obtained by using bulk shared memories to expedite information passing between the attached array processors. In this manner we have been able to obtain data for chains with 128 and 256 units. Data on these larger chains indicate that the radius of gyration follows the predicted power law.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 11 (1990), S. 145-156 
    ISSN: 1572-9567
    Keywords: calorific value ; compressibility factor ; equation of state ; natural gas ; mixtures ; specific gravity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurement of large volume flows of natural gas in transmission lines requires an accurate equation of state for pressures up to about 12 MPa and in the temperature range from 265 to 335 K. If a detailed analysis of the gas mixture is available, one of the possibilities is to use the virial equation of state. However, such a gas analysis is time-consuming and expensive and, therefore, not always practical. We have developed a new equation which is based on the virial equation but requires limited input data. In general, for any given natural gas, the gross calorific value, the specific gravity, and the mole fractions of nitrogen and carbon dioxide are known. It will be shown that a knowledge of three of these four quantities is sufficient for an accurate prediction of the compressibility factor of the natural gas.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 9 (1988), S. 985-992 
    ISSN: 1572-9567
    Keywords: compressibility ; data analysis ; mixtures ; virial coefficients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The compressibility factor of multicomponent systems can be obtained in terms of virial coefficients of the pure components and their binary mixtures. This paper concerns a method with which, for that purpose, the second and third virial coefficients for these binaries have been determined from experimental data. From useful data, second and third virial coefficients are obtained as a quadratic function of the temperature. The density domain for which these results are applicable is discussed. When ample data are available, results for a sample mixture can be obtained in a straightforward manner. Nevertheless, it is shown that under much less favorable conditions—sometimes even when pure-component data are lacking—fairly good results can still be obtained. In that case, the choice for an appropriate combining rule has to be considered carefully. Finally, the involvement of ternary mixture data, both obtained experimentally and predicted by the equation, is considered.
    Type of Medium: Electronic Resource
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