Nondestructive testing (NDT) of composite materials is important in aerospace applications, and millimeter-wave (mm-wave) imaging has been increasingly used for this purpose. Imaging traditionally performed using Fourier methods, with inverse methods being an alternative. This communication presents mm-wave method approach intended NDT singly curved panels sparsely distributed flaws. It builds ...

Abstract The application of composite materials in the primary structures large aircraft fuselage is a development trend recent years. As an indispensable structure design and selection, accurate efficient evaluation its performance great significance to reduce research cost. In this paper, bearing capacity stiffened curved panel calculated through improved engineering calculation method, effec...

Two flavor Nambu-Jona-Lasinio model with N components is studied in curved space time at finite temperature and density in the leading 1/N expansion. In four space time dimension the model exhibits first order phase transition for positive curvature. Whereas in flat space an increase in temperature induces a second order phase transition even at finite density, in curved space the transition be...

Scalar fields at finite temperature are considered in four dimensional ultrastatic curved spacetime. One loop nonlocal effective action at finite temperature is found up to the second order in curvature expansion. This action is explicitly infrared finite. In the high temperature expansion of free energy, essentially nonlocal terms linear in temperature are derived. e-mail: [email protected]...