Showing papers in "Cryogenics in 1976"

TL;DR: In this paper, the influence of oscillating magnetic fields on the dc transport current in a single core superconducting wire has been studied by observing the terminal voltage of the wire.

TL;DR: In this paper, a compilation of 72 published thermochemical cycles for the production of hydrogen from water is presented, and a review of the most modern concepts for the hydrogen production from water can be found.

TL;DR: In this article, a significant improvement in the performance of evacuated multilayer insulations can be achieved by incorporating getter materials such as activated carbon in the spacer material, without the need for elaborate vacuum bake-out procedures.

TL;DR: In this article, the authors describe the propagation velocities of normal zones in composite superconductors and compare their theory with experiments on bare (uninsulated) conductors, concluding that the effects of transient heat transfer may need to be included in the theory to improve agreement with experiment.

TL;DR: In this paper, the compositional dependence of the Neel temperature has been studied, from data derived by different techniques and by various authors, for 30 austenitic stainless steels or special Fe-Cr-Ni alloys whose compositions fall near the range of the AISI 300 series.

TL;DR: In this article, a corresponding states procedure to predict the viscosity and thermal conductivity coefficients of a pure fluid or mixture is discussed, and it is shown that the conventional corresponding states approach is not sufficient to predict correctly the transport properties.

TL;DR: In this paper, the surface treatment of Nb3Sn cavities has been investigated for linear accelerators with high critical temperatures, such as Niobium cavities, which have potentially even more favorable rf characteristics compared to niobium.

TL;DR: In this article, both theoretical and experimental investigations of the error behavior of cryo current comparators (CCC) as a function of the geometric parameters of the superconducting shields are presented.

TL;DR: The use of the silica plummet technique to measure accurately the density of pure liquefied methane, ethane, propane, n-and iso-butane, and n- and iso-pentane in the temperature range 93 to 173 K (from 180°C to 100°C) is described in this article.

TL;DR: In this paper, a method of making joints between superconducting multifilamentary wires has been developed in connexion with the construction of a 7 T nmr magnet.

TL;DR: In this paper, a field-decay measurement technique to evaluate joints between superconducting multi-filamentary wires is described, which permits the measurement of both the resistance of the joint and its current carrying capacity in a matter of a few hours.

TL;DR: In this paper, the mechanical properties of a solution treated and double aged nickel -18% iron - 18% chromium alloy (Inconel 718) were studied to assess its utility at temperatures in the ambient-to-cryogenic range.

TL;DR: A nuclear demagnetization cryostat in which liquid He3 has been successfully cooled below 0.7 mK is described in this paper, where the essential parts of the apparatus and its operation and performance are explained.

TL;DR: In this paper, the electric field and losses for the first and immediately following second increase of the transport current were derived using a simplified model (J c = const) and the expressions for the electric fields and losses were derived.

TL;DR: In this article, a torque method for investigating pinning and viscous friction of vortices in a type II superconductor which continuously rotates with frequency f in a magnetic field H directed perpendicular to the axis of rotation was described.

TL;DR: In this paper, the pressure drop of boiling two-phase nitrogen flow in a smooth horizontal tube has been studied experimentally and the results show the well-known dependence of the local pressure drop from the vapour quality, the mass flow rate, and the heat flux.

TL;DR: In this paper, the measured local heat transfer coefficients in nucleate boiling depend on the heat flux as well as on the mass flow rate, pressure, and diameter dependence of para-hydrogen data of other authors.

TL;DR: In this paper, the behavior of a section of multifilamentary superconductor exposed to a pulsed longitudinal magnetic field is investigated theoretically and experimentally and a new kind of filament coupling originating from the twist has been found.

TL;DR: In this paper, the authors extended the error analysis on gaps forming a ring cavity and showed that the only field component which may penetrate the gap without attenuation is the one containing the useful signal about the current linkage of the comparator.

TL;DR: In this article, a memory cell with a write junction in a horizontal stripline loop, and a sense junction controlled by the loop current, has been implemented for a minimum line width of 2 μm.

TL;DR: A 16.5 T superconductive magnet system, which is easily mobile, is described and its mode of operation for use by several different workers over a short period is discussed and the main areas of application to date are listed.

TL;DR: The linear thermal expansion coefficient, α, has been measured from 2 to 32 K and from 55 to 90 K for a machineable glass-ceramic, an 'ultra-low expansion' titanium silicate glass (Corning ULEE), and ceramic glasses (Cer-Vit and Zerodur), and for glassy carbon.

TL;DR: In this paper, room temperature tensile testing has been carried out on a number of multifilamentary Nb 3 Sn superconductivity wires and it was shown that filament cracking does not occur until strains approaching 1% have been reached.

TL;DR: In this paper, both gold plating and solid silver were used for the contact surfaces to achieve a switch conductance greater than 1 W K−1 at 15 K for a switch closed at this temperature with a force of 54 kg.

TL;DR: In this paper, the concept of glass microsphere cryogenic insulation is discussed and significant advances made in the past few years are described. And the authors discuss the potential applications of microspheres in a wide range of applications.

TL;DR: The density and thermal conductivity of solid nitrogen and carbon dioxide have been measured as discussed by the authors, and the results showed that the density of carbon dioxide increased with increasing deposition rate and temperature but carbon dioxide showed different behaviour at a deposition rate of 400 mg s−1 m−2 and a temperature of 108 K.