Far-infrared continuum absorption of forsterite and enstatite at low temperatures

Infrared water vapor continuum absorption at atmospheric temperatures.

We have used a continuous-wave carbon dioxide laser in a single-mode realization of cavity ring-down spectroscopy to measure absorption coefficients of water vapor at 944 cm(-1) for several temperatures in the range 270-315 K. The conventional description of water vapor infrared absorption is applied, in which the absorption is modeled in two parts consisting of local line absorption and the re...

Far-infrared spectra of hydrous silicates at low temperatures

Context. Hydrous silicates occur in various cosmic environments, and are among the minerals with the most pronounced bands in the far infrared (FIR) spectral region. Given that Herschel and ALMA will open up new possibilities for astronomical FIR and sub-mm spectroscopy, data characterizing the dielectric properties of these materials at long wavelengths are desirable. Aims. We aimed at examini...

Electronic continuum states and far infrared absorption of InAs/GaAs quantum dots

Evaluation of continuum damage at different temperatures for aluminum-silicon alloy of engine piston within low-cycle fatigue regime

In this article, the isothermal low-cycle fatigue continuum damage in the engine piston aluminum alloy has been evaluated at different temperatures. For this objective, experimental data of low-cycle fatigue tests on standard specimens were used at 280, 350 and 425°C. Based on the continuum damage mechanics method, the fatigue damage was calculated during cyclic loading. Obtained results, inclu...

Rapid identification of steatite–enstatite polymorphs at various temperatures

The mechanical properties of steatite ceramics after high-temperature processing depend on inversion of high-temperature Mg2Si2O6 protoenstatite polymorph to low clinoor ortho-enstatite, which are characterized by Raman spectroscopy. The Raman spectrum of a pure Mg2Si2O6 protoenstatite is sufficiently distinct from those of low clinoand ortho-enstatite to allow rapid identification in a bulk sa...