Results 261 to 270 of about 180,663 (310)

N-Type Silicon Films Produced by Hot Wire Technique

MRS Proceedings, 2000
ABSTRACTThe role of the deposition pressure (p) and the type of filaments (tungsten, W or tantalum, Ta) used to produce large area (10cm×10cm) n-type Si:H films by hot wire chemical vapour (HW-CVD) deposition technique was investigated. The data show that the electro-optical properties of the films produced are dependent on the gas pressure used.
Isabel M. M. Ferreira, Ana M. F. Cabrita, Elvira M. C. Fortunato, Rodrigo F. P. Martins   +3 more
openaire   +1 more source

Arc heating hot wire assisted arc welding technique for low resistance welding wire

Science and Technology of Welding and Joining, 2007
An assistant arc was used to preheat the wire for hot wire tungsten inert gas (TIG) welding which was independent on the resistance of the welding wires and avoided the drawbacks of the traditional hot wire preheating method. The new method is suitable for low resistance wire such as copper and aluminium.
S. X. Lv, X. B. Tian, H. T. Wang, S. Q. Yang   +3 more
openaire   +1 more source

An oscillating hot-wire technique for resolving the magnitude and direction of velocity measurements using single hot-wire sensors

Experiments in Fluids, 2003
Thermal anemometry is a classic flow-velocity measurement technique that is known to suffer from the inability to discern the flow direction. The current paper describes an innovative approach whereby an oscillating hot wire is used to extract velocity direction and magnitude information from single hot-wire measurements.
Y. Li, A. Naguib
openaire   +1 more source

Turbulent mass flux measurements using a laser/hot-wire technique

International Journal of Heat and Mass Transfer, 1988
Abstract A laser-Doppler anemometer and a hot-wire type concentration probe are used to measure the velocity and species concentration fields simultaneously in an axisymmetric sudden-expansion flow. The presence of the probe has a negligible effect on the Doppler signals.
J.Y. Zhu, R.M.C. So, M.V. Otugen
openaire   +1 more source

Nanocrystalline silicon carbon doped films prepared by hot wire technique

Vacuum, 1999
Abstract In this work we present data concerning the structure, composition and electro-optical performances of nanocrystalline silicon carbide doped films produced at the different filament temperatures and hydrogen dilution ratios. The XRD spectra reveal the presence of the typical Si peaks ascribed to (111) (220) and (311) diffraction planes ...
I Ferreira, B Fernandes, R Martins
openaire   +1 more source

Generalised hot-wire technique for high pressure thermal conductivity measurements

Journal of Physics E: Scientific Instruments, 1988
The application of the generalised hot-wire technique to high pressure thermal conductivity measurement is discussed. Results for the thermal conductivity of NaCl obtained with a wire sandwiched between two homogeneous discs, one of NaBr and one of NaCl, were recorded in the pressure range 0-4 GPa.
R J Gummow, I Sigalas
openaire   +1 more source

Thermal conductivity of biological tissues using transient hot-wire technique

SPIE Proceedings, 2001
In this paper, we present our experimental results on the determination of the thermal conductivity of biological tissues using a transient technique based on the principles of cylindrical hot-wire method. A novel, 1 .45mmdiameter, 50mm long hot wire probe was deployed.
Anandaroop Bhattacharya, Roop L. Mahajan
openaire   +1 more source

Some studies on hot-wire calibration using Monte Carlo technique

Journal of Physics E: Scientific Instruments, 1984
A numerical experiment has been used to determine the sample size required to accurately determine the calibration constants of hot wires. The method is based on a Monte Carlo simulation of the hot-wire response, for a prescribed set of conditions, by assuming a heat transfer model for the hot wire.
M K Swaminasthan, G W Rankin, K Sridhar
openaire   +1 more source

The Hot-Wire Technique in Supersonic Research

2011
For the last few years considerable attention has been turned to the problem of turbulence in supersonic flows. There are several new aspects to the compressible case that are of great academic and practical interest. In particular, one should mention the problems of the onset of supersonic turbulence (transition) and of the aerodynamic noise. Although
openaire   +1 more source

Experimental comparison of two hot-wire techniques in supersonic flow

AIAA Journal, 1989
The performance of two constant-temperature normal hot-wire techniques for resolution of turbulent mass flux and local stagnation temperature in a supersonic flow is examined. The first technique used a single wire and the rapid scanning of multiple overheat ratios.
D. A. Walker, W. F. Ng, M. D. Walker
openaire   +1 more source