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  • 1995-1999  (5)
  • 1965-1969
  • 1955-1959
  • 1997  (1)
  • 1996  (4)
Material
Years
  • 1995-1999  (5)
  • 1965-1969
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 42 (1997), S. 404-407 
    ISSN: 1573-2568
    Keywords: IRRITABLE BOWEL SYNDROME ; UROLOGICAL SYMPTOMS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Irritable bowel syndrome patients often complainof urinary symptoms such as frequency, urgency, anddysuria, raising the possibility of inappropriatereferral to the urologist. To resolve this issue, the prevalence of irritable bowel syndrome wascompared in patients attending urological and controlclinics (dermatology and ENT). The overall prevalence ofirritable bowel syndrome was 31.2% in the urological clinic compared with 21.2% in the controls (P〈 0.001), but striking differences emerged, dependingon presenting complaint. Irritable bowel symptoms wereparticularly common in patients presenting with loin pain (male: 40.9%, P = 0.004; female: 50%, P =0.03), dysuria (male: 43.8%, P = 0.007; female: 46.2%,P = 0.01) and frequency/urgency (male: 31.7%, P = 0.002;female: 42.4%, P = 0.006), and the male/femaleprevalence was 24% and 44%. These results suggest that inirritable bowel syndrome, urinary symptoms includingloin pain can present diagnostic dilemmas in both thegastroenterological and urological setting, underlining the importance of specialists in these fieldsworking together in order to define better ways ofmanaging such patients.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 211 (1996), S. 173-179 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The phase behaviour of carbon dioxide confined in VYCOR glass at pressures below that of the bulk triple point (∼0.51 MPa) has been investigated. The temperature at which freezing occurs appears to be pressure dependent below 0.3 MPa. As experiments are performed at successively lower pressures, the confined phase transitions gradually disappear, due to either partial pore filling, or the proximity of the confined triple point.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 211 (1996), S. 165-171 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In confined (nanometer-scale) geometry, the effects of substrate forces and finite size produce a shift of the gas ⇔ liquid phase boundary from that found in corresponding bulk. The pore transitions also show marked hysteresis. The phase behaviour of a binary gas mixture in confined geometry is likely to depend on the miscibility of the system and the interaction between the substrate and the individual fluid molecules/atoms. Here, we present the results of a pilot positronium annihilation study of the condensation and evaporation of argon-nitrogen mixtures confined in ∼4 nm diameter cylindrical pores in VYCOR glass.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 210 (1996), S. 255-271 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In this paper we present a brief review of the current state of positron annihilation research into the phase behaviour of fluids confined within restricted boundaries. We summarise, in the form of selected examples, the work done so far on: (1) fluids confined in the nanometer-size pores of VYCOR glass, with particular emphasis on the confined phase diagram and the mechanisms behind phase transitions compared to bulk. (2) The adsorption/physisorption of gases on internal surfaces of grafoil and the potential of positron technique for revealing physical properties, such as the intricate molecular arrangements during phase transitions of the “layered” fluid.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 210 (1996), S. 575-582 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In this paper we present our recent positron annihilation study of the liquid»solid phase boundary for CO2 confined in nanometer pores of VYCOR glass. We find that CO2 remains liquid in the pores far below the bulk freezing temperature and there is pronounced hysteresis between freezing and melting compared to that seen at the gas-liquid boundary in the pores. On freezing we see evidence of open space created in the pores. This leads to complex melting behaviour possibly involving the formation of gas-liquid interfaces. We see that frezing in the pores is totally irreversible, so that any solid which forms (no matter how small) remains stable up to the higher melting temperature. In contrast melting is more reversible (possibly indicating nucleation centres which permit immediate re-freezing). Finally, the pre-frozen state in the pores is different to the post-melted state.
    Type of Medium: Electronic Resource
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