(nasa-tm-x-71502) Rational Function N74-16714 Representation of Flap Noise Spectra including Correction for Reflection

Transmission and Reflection Characteristics of a Concrete Block Wall Illuminated by a TM-polarized Obliquely incident wave

Typically, many of the modern buildings have concrete walls constructed from cinder block walls, that have periodic nature in their relative dielectric constant. This periodic nature excites higher-order Floquet harmonic modes at microwave frequencies, which leads to the propagation of scattered waves along with non-specular directions. Periodic structures exhibit different behaviors when illum...

Nasa Technical Memorandum Nasa Tm-75059 Effect of Flap Deflection on the Lift Coefficient of Wings Operating in a Biplane Configuration

Growth of CsI(Tl) crystals doped with Ca and Tm and investigation of its scintillation characteristics

In this work, the growth of CsI(Tl) crystals as gamma detector was performed using vertical Bridgman method with Ca and Tm co-dopants. For evaluation of the growth crystals, X-Ray Diffraction (XRD), photoluminescence and thermoluminescence spectra as well as recorded gamma spectra were employed. In addition, the scintillation properties including energy resolution, scintillation decay time, abs...

Reflection Spectra of Lanthanides in Thorium

Retaining the cubic structure, ThO, can accomodate large concentrations of lanthanides and the equivalent amount of oxygen vacancies. The reflection spectra are measured at 100 °K of Nd(III), Sm (III), Eu (III), Ho(lil), Er (III), Tm(III) and Yb(III) in such samples. The excited /-levels correspond to rather broad bands in Thi-a-Mj-Oi-o.öx whereas Nd203 and Er203 have very detailed line groups....

Signal detection Using Rational Function Curve Fitting

In this manuscript, we proposed a new scheme in communication signal detection which is respect to the curve shape of received signal and based on the extraction of curve fitting (CF) features. This feature extraction technique is proposed for signal data classification in receiver. The proposed scheme is based on curve fitting and approximation of rational fraction coefficients. For each symbo...