We present what we believe to be a novel approach to simulating the spectral fine structure (<1 nm) in measurements of spectrometers such as the Global Ozone Monitoring Experiment (GOME). GOME measures the Earth's radiance spectra and daily solar irradiance spectra from which a reflectivity spectrum is commonly extracted. The high-frequency structures contained in such a spectrum are, apart fro...

The nitrogen K-edge near edge x-ray absorption fine structure spectrum of -crystalline glycine has been calculated for temperatures ranging from 0 to 450 K. Significant temperature dependent spectral changes are predicted. The calculated room temperature spectrum is in good agreement with the experiment. At high temperatures, molecular motions strongly influence the spectrum, as any unique spec...

In this thesis, first, we address the problem of energy efficiency for spectrum sensing. We propose a combined censoring and ”on/off” scheme as an energy efficient technique for cognitive radio networks. We maximize the lifetime of the spectrum sensing system by minimizing the energy consumption of the system subject to a specific detection performance constraint. We show that our proposed tech...

Gravitational microlensing has become a mature technique for discovering small gravitational lenses in the Universe which are otherwise beyond our detection limits. Similarly, plasma can help us explore cosmic lenses. Both pulsar scintillation and extreme scattering events of compact radio sources suggest existence $\sim$ AU scale ionized interstellar medium (IISM), whose astrophysical correspo...