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Author (up) Bressan, O.J.; Ridner, A.E.; de la Cruz, F.
Title T^5 law and Matthiessen's rule Type Journal Article
Year 1975 Publication Journal of Physics F: Metal Physics Abbreviated Journal J. Phys. F: Met. Phys.
Volume 5 Issue 3 Pages 481
Keywords
Abstract Precise electrical resistivity measurements on very dilute non magnetic indium alloys show no doubt in a T 5 dependence on temperature between 1-4K and strong deviations from Matthiessen rule. Measurements of thermal resistivity show that the extrapolation method to obtain the data to H=0 is correct. Comparison of the results with recent theories is discussed.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0305-4608 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 547
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Author (up) Bressan, O.J.; Ridner, A.E.; de la Cruz, F.
Title Low angle electron scattering in thermal resistivity Type Journal Article
Year 1975 Publication Journal of Physics F: Metal Physics Abbreviated Journal J. Phys. F: Met. Phys.
Volume 5 Issue Pages 1902-1909
Keywords
Abstract Electrical ( rho ) and thermal (W) resistivity measurements in very dilute In alloys between 1K and 4K show a temperature dependence expressed by rho = rho 0+ beta T5 and WT=(WT)0+AT3+BT5. The BT5 term in the thermal resistivity is due to a contribution from a 'diffusion-like process' of electrons over the Fermi surface, as is the one that describes the temperature dependence of the electrical resistivity. This claim is supported by the experimental fact that the Lorenz number defined as L= beta /B coincides with the value given by L= rho 0/(WT)0 which in turn agrees with the free electron value within 15%.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 550
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Author (up) Bressan, O.J.; Ridner, A.E.; Luengo, C.A.; Alascio, B.
Title On the evidence for electron-electron scattering in the electrical resistivity of In Type Journal Article
Year 1970 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 8 Issue 24 Pages 2129-2133
Keywords
Abstract Experimental measurements of the electrical magnetoresistivity of high purity Indium at low temperatures have been performed and clearly indicate that:

1. (a) A generalized Kohler's rule can be used to describe all experiments.

2. (b) A reliable method is therefore obtained for extrapolating the zero magnetic field resistivity to temperatures below the superconducting transition temperature.

3. (c) Clear-cut and reliable data show that no T2 dependence of the resistance is found; therefore no evidence of electron-electron interaction appears, contrary to information previously reported in the literature.
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0038-1098 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 548
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Author (up) de la Cruz, F.; Bressan, O.J.
Title Sensitive Hot Wire Level Detector for Cryogenic Liquids Type Journal Article
Year 1969 Publication Review of Scientific Instruments Abbreviated Journal Rev. Sci. Instrum.
Volume 40 Issue 3 Pages 483-486
Keywords
Abstract A very simple and highly sensitive ``hot wire'' type level detector to be used with cryogenic liquids is described. The hot filament is made of tungsten wire of about 4 µ diam. The tests on the sensor were made moving the filament in and out of the quiescent surfaces of liquid helium and nitrogen. The results showed 0.006 mm sensitivity in the determination of liquid helium level and 0.002 mm sensitivity in the case of liquid nitrogen level. The sensor is assembled in such a way that it can be used without special precautions during indefinite periods of time. For the case when the full capabilities of the sensor are not necessary, a simple circuit is presented.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 549
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Author (up) de la Cruz, M.E.; Cotignola, J.M.; Bressan, O.J.; Luengo, C.A.
Title Thermal and Electrical Conductivities of Very-High-Purity Indium Type Journal Article
Year 1968 Publication Physical Review Abbreviated Journal Phys. Rev.
Volume 176 Issue 3 Pages 871-875
Keywords
Abstract Measurements of the thermal and electrical conductivities of a polycrystalline indium sample of very high purity have been performed between 1.5 and 4.2°K and in the presence of longitudinal magnetic fields up to 15 000 Oe. It was found that, within the experimental error, the electrical and thermal Kohler's rules were satisfied, the functional forms for the two being quite similar. The expression for the resistivity as a function of T for the normal state and in zero magnetic field are in good agreement with theory. The Lorenz number obtained by extrapolating to T=0 gives a very high value compared with the theoretical one. Measurements of the thermal conductivity for the superconducting state, in the same temperature range, have been made. The thermal-resistivity ratio Wn / Ws as a function of the reduced temperature does not agree with the results of Kadanoff and Martin.
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ PhysRev.176.871 Serial 536
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Author (up) Ridner, A.E.; Bressan, O.J.; Cotignola, J.M.
Title A high performance throttle valve Type Journal Article
Year 1972 Publication Vacuum Abbreviated Journal
Volume 22 Issue 2 Pages 51
Keywords technical; vacuum
Abstract Design details and working performance of a logarithmic throttle valve with a large range are given. Special features make the logarithmic valve particularly suitable for servomechanism operation in controlled systems.
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0042-207X ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 551
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