Search NASA⌕ Search

SEARCH · Search NASA

Results for “Texturing”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 577 records · Page 32

Effect of Carbon Nanotube Addition on the Superconducting Properties of BSCCO Samples Textured via Laser Floating Zone Technique

In this research, the effect of carbon nanotube (CNT) addition on the structural and superconducting properties of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} + x wt% CNT materials with x = 0, 0.5, 1, and 3 prepared by solid state method, followed by directional grown using the laser floating zone (LFZ) technique has been investigated. XRD measurements showed that all samples are composed of almost single Bi-2212 phase. SEM images proved that Bi-2212 phase is the major one, with minor amounts of (Sr,Ca){sub 3}BiO{sub x}, and Bi-2201 secondary phases. According to the magnetic results, carbon nanotubes decrease T{sub c} values and significantly reduce the magnetic hysteresis loops area and the magnetic critical current density.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗

Cylindrical and plane surface electromagnetic waves in laser technology of silicon surface texturing with a double femtosecond pulse

This paper presents experimental results of laser modification of the surface of monocrystalline silicon under the influence of a double femtosecond laser pulse with varying delays less than or close to the electron–phonon interaction time, as well as the results of numerical simulation of the photoexcitation of a semiconductor in the approximation of dielectric constant. It is shown that the excitation of cylindrical surface waves not only precedes the excitation of plane surface electromagnetic waves, but is also a determining factor in the cumulative change in the dielectric constant of the medium and the creation of conditions for the excitation of plane surface electromagnetic waves.

36 MATERIALS SCIENCE↗