A Generalized Function in Heat Conductivity Problems for Multilayer Structures with Heat Sources

The creation of the efficient reinforced concrete structures, that allows to reduce the material consumption as well as the labor costs, is the most important task today. One of the possible ways of solving this problem is the design and wide application of multilayer structures in which high mechanical, heat engineering and acoustic properties are provided due to the combination of high strength of heavy concrete and low strength of light concrete with low heat conductivity. The advantages of three-layer reinforced concrete structures are shown. The proposals have been made to take into account the sag and the classes of lightweight concrete of such elements.

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Temperature distribution in nonlinear multilayer structures with several heat sources

International Communications in Heat and Mass Transfer ◽

10.1016/0735-1933(77)90027-6 ◽

1977 ◽

Vol 4 (2) ◽

pp. 149-154

Author(s):

A Silard

Keyword(s):

Temperature Distribution ◽

Multilayer Structures ◽

Heat Sources

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Al-CuOx multilayer nanostructures: formation features and thermal properties of new type of local heat source

Journal of Physics Conference Series ◽

10.1088/1742-6596/2086/1/012213 ◽

2021 ◽

Vol 2086 (1) ◽

pp. 012213

Author(s):

A I Novoseltsev ◽

L I Sorokina ◽

A V Sysa ◽

R M Ryazanov ◽

E A Lebedev

Keyword(s):

Thermal Properties ◽

Heat Source ◽

Magnetron Sputtering ◽

Copper Oxide ◽

Deposition Process ◽

Local Heat ◽

Multilayer Structures ◽

Heat Sources ◽

Multilayer Nanostructures ◽

New Type

Abstract In this work, multilayer nanostructured thermite materials are considered - a new type of local heat sources. Aluminium and copper oxide were chosen as components of the thermite mixture. The formation of multilayer structures was carried out on the surface of the substrate by the method of magnetron sputtering. The features of the deposition process as well as the energy properties of the formed materials have been investigated. The results obtained confirm the prospects of using this class of materials as local heat sources.

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Investigation of ultra-thin films of YBa2Cu3O7−δ grown on MgO

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173169 ◽

1990 ◽

Vol 48 (4) ◽

pp. 6-7

Author(s):

S.K. Streiffer ◽

C.B. Eom ◽

J.C. Bravman ◽

T.H. Geballet

Keyword(s):

Thin Films ◽

Room Temperature ◽

Deposition Process ◽

Nucleation And Growth ◽

Multilayer Structures ◽

Rf Power ◽

Oxygen Loss ◽

Transmission Electron ◽

Single Target ◽

Mtorr Argon

The study of very thin (<15 nm) YBa2Cu3O7−δ (YBCO) films is necessary both for investigating the nucleation and growth of films of this material and for achieving a better understanding of multilayer structures incorporating such thin YBCO regions. We have used transmission electron microscopy to examine ultra-thin films grown on MgO substrates by single-target, off-axis magnetron sputtering; details of the deposition process have been reported elsewhere. Briefly, polished MgO substrates were attached to a block placed at 90° to the sputtering target and heated to 650 °C. The sputtering was performed in 10 mtorr oxygen and 40 mtorr argon with an rf power of 125 watts. After deposition, the chamber was vented to 500 torr oxygen and allowed to cool to room temperature. Because of YBCO’s susceptibility to environmental degradation and oxygen loss, the technique of Xi, et al. was followed and a protective overlayer of amorphous YBCO was deposited on the just-grown films.

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