Differential cross sections for excitation to the n=2 states of atomic helium by electrons were computed for incident energies in the range from 30 to 50 eV. The n=2 states excitation cross sections are calculated with the use of closecoupling expansion with a non-orthogonal Laguerre-L2 basis function. The present status of agreement between theory and experiment for excitation of the ground-st...

Excitation functions of 8 Li(, n), (d, t) and 12 B(, n) reactions were directly measured in the energy region of astrophysical interest using low-energy radioactive nuclear beams of 8 Li and 12 B. Each measured excitation function is strongly affected by one or more resonances through a compound nucleus. The measured excitation functions are presented. Dominant r-process paths through 8 Li at...

In indirect band gap GaAs1−xPx alloys, the Nx levels of the excitons bound to nitrogen have been resonantly excited. The detection of the photoluminescence (PL) at energies greater than the excitation energy (Anti-Stokes Luminescence (ASL)) shows a new PL band which appears at temperatures lower than 40 K. Its mean energy 2.205 eV is nearly independent of the alloy composition. We investigate A...

We employ stochastic modelling of statistical reactions with memory to study quasiperiodic oscillations in the excitation functions of dissipative heavy-ion collisions. The Fourier analysis of excitation function oscillations is presented. It suggests that S-matrix spin and parity decoherence, damping of the coherent nuclear rotation and quantum chaos are sufficient conditions to explain the no...

Energy harvesting is a conventional method to collect the dissipated energy of a system. In this paper, we investigate the optimal location of a piezoelectric element to harvest maximum power concerning different excitation frequencies of a vibrating cantilever beam. The cantilever beam oscillates by a concentrated sinusoidal tip force, and a piezoelectric patch is integrated on the beam to gen...

Over the last years two-photon excitation 4Pi-microscopy with an axial resolution of ~100 nm has been demonstrated in multiple biological applications [1-3]. The artefact-free presentation of the recorded structures has been possible because of the contiguous optical transfer function (OTF), which allows reliable image deconvolution. The use of two-photon excitation (2PE) has been critical to s...

Fluorescence correlation spectroscopy (FCS) could provide a more useful tool for intracellular studies and biological sample characterization if measurement times could be reduced. While an increase in laser power can enable an autocorrelation function (ACF) with adequate signal-to-noise to be acquired within a shorter measurement time, excitation saturation then leads to distortion of the ACF ...

The application of two-photon excitation to fluorescence microscopy has become a powerful tool for studying biological function in live tissue and offers many advantages over conventional imaging techniques. Neuroscientists in particular have used this technology to image physiological functioning in microscopic and subcellular neural compartments. Neurons can be imaged deep within highly light...