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| 2. |
- Andersson, Britt M., et al.
(author)
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Electrical resistivity and critical temperature of Bi-based high-Tc superconductors to 1 GPa
- 1990
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In: High Pressure Research, volumes 3 to 5. - London : Gordon and Breach. - 2881247466 ; 3:1-6, s. 120-122
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Conference paper (peer-reviewed)abstract
- We have measured the electrical resistance R of a sintered, two-phase, high-TC superconductor with the nominal composition BiSrCaCu2Ox, as a function of T and p. We find d(lnR)/dp ≃ -0.06 GPa-1 at 295 K, while dTC/dp is 2.5 K/GPa for the phase with Tc ≃ 76 and 2 K/GPa for that with TC ≃ 106 K.
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| 3. |
- Andersson, Britt M., et al.
(author)
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Electrical transport properties of dense bulk YBa2Cu4O8 produced by hot isostatic pressing
- 1990
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In: Physica. C, Superconductivity. - 0921-4534 .- 1873-2143. ; 170:5-6, s. 521-531
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Journal article (peer-reviewed)abstract
- Highly dense sintered YBa2Cu4O8 has been produced by hot isostatic pressing (HIP). The electrical resistivity varrho of this material has been measured as a function of temperature T and pressure varrho in the range 40–650 K and 0–0.7 GPa. Both the temperature dependence and the pressure dependence of varrho are found to be well described by a model based on the standard Bloch-Grüneisen theory. It is pointed out that varrho is liner in T only under isobaric conditions, while varrho is strongly nonlinear in all high-Tc superconductors under isochoric (constant volume) conditions. The critical current density of the material is 900 A/cm2 at 4 K, while the resistivity is 630 μΩ cm at 294 K.
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| 4. |
- Andersson, Britt M., et al.
(author)
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High-pressure properties of high-Tc superconductor samples produced by hot isostatic pressing
- 1990
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In: High Pressure Research, volumes 3 to 5. - London : Gordon and Breach. - 2881247466 ; 3:1-6, s. 123-125
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Conference paper (peer-reviewed)abstract
- The electrical resistance of dense YBa2Cu3Ox and YBa2Cu4Oy produced by hot isostatic pressing has been measured vs. T and p. At 295 K we find d (ln R)/dp ≃ -0.12 and -0.09 GPa-1, respectively, with no systematic dependence on initial density. For 1-2-4, dTC/dp ≃ 5.1 K/GPa, which is ten times that of 1-2-3.
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| 6. |
- Niska, John, et al.
(author)
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Formation of the 124 phase superconductor (YBa2Cu4O8) by retaining oxygen in a reaction HIP sintering process
- 1990
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In: Journal of materials science letters. - 0261-8028 .- 1573-4811. ; 9:7, s. 770-771
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Journal article (peer-reviewed)abstract
- The ceramic superconductor YBa2Cu4O8 has been produced by high temperature sintering of a mixture of CuO and YBa2Cu3O7 in a glass capsule under high hydrostatic argon pressure. The resulting highly dense material is investigated by X-ray diffraction, optical and electron microscopy, resistance measurements and hardness measurements, and shown to be a homogeneous High transition temperature superconductor.
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| 8. |
- Aden, A S, et al.
(author)
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The growth chart - a road to health chart? : Maternal comprehension of the growth chart in two Somali villages
- 1990
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In: Paediatric and Perinatal Epidemiology. - : Wiley. - 0269-5022 .- 1365-3016. ; 4:3, s. 340-350
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Journal article (peer-reviewed)abstract
- Growth monitoring is so far not implemented on a large scale in the Somali health services. Available reports indicate that growth faltering is common. However, the use of growth charts as a tool for health education has been questioned. This study examines the ability of 199, predominantly illiterate, rural Somali mothers to understand the growth chart message after an intensive period of growth chart use and education. During a home-based interview the mothers were asked to combine a set of four growth curves with a set of four pictures, showing the corresponding developments of four children. The mothers managed significantly better to interpret the charts than could be expected by chance alone. Maternal age, number of children and literacy did not differ much between those who correctly and incorrectly combined pictures and charts. Almost all mothers recognised the value of the growth chart as being good for the control and promotion of their children's health and/or growth. We conclude that the growth chart may be an applicable and appropriate tool even with illiterate mothers, provided that other prerequisites for successful growth monitoring, e.g. appropriate health services, are available.
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