Photoluminescence in silicon-doped n-indium selenide

Photoluminescence results on silicon-doped indium selenide are reported. The effect of temperature and excitation intensity is studied. At low temperature, free and neutral donor bound exciton peaks are observed. Above 100 K only free exciton and band-to-band photoluminescence is detected. In order to give account of the full lineshape as a function of the absorption coefficient, the Urbach absorption tail of InSe is measured. Transmission and reflection photoluminescence spectra are also compared in order to study the effect of carrier diffusion. The shape of the photoluminescence spectrum can be accounted for through a direct gap model.

Primary ciliary dyskinesia assessment by means of optical flow analysis of phase-contrast microscopy images

Primary ciliary dyskinesia implies cilia with defective or total absence of motility, which may result in sinusitis, chronic bronchitis, bronchiectasis and male infertility. Diagnosis can be difficult and is based on an abnormal ciliary beat frequency (CBF) and beat pattern. In this paper, we present a method to determine CBF of isolated cells through the analysis of phase-contrast microscopy images, estimating cilia motion by means of an optical flow algorithm. After having analyzed 28 image sequences (14 with a normal beat pattern and 14 with a dyskinetic pattern), the normal group presented a CBF of 5.2 +/- 1.6 Hz, while the dyskinetic patients presented a 1.9 +/- 0.9 Hz CBF. The cutoff …

A Ciliary Motility Index for Activity Measurement in Cell Cultures With Respiratory Syncytial Virus

[EN] Background: The respiratory epithelium is frequently infected by the respiratory syncytial virus, resulting in inflammation, a reduction in cilia activity and an increase in the production of mucus. Methods: In this study, an automatic method has been proposed to characterize the ciliary motility from cell cultures by means of a motility index using a dense optical flow algorithm. This method allows us to determine the ciliary beat frequency (CBF) together with a ciliary motility index of the cells in the cultures. The object of this analysis is to automatically distinguish between normal and infected cells in a culture. Results: The method was applied in 2 stages. It was concluded fro…

Comments on 'SPICE Model of Photomultiplier Tube Under Different Bias Conditions'

[EN] The paper ¿SPICE Model of Photomultiplier Tube Under Different Bias Conditions¿ is commented. We revisit the mathematical formulation to compensate for some ambiguities in the original manuscript, and point out some inconsistencies in the results and reproducibility of the simulations, as well as in the optimized parameters originally obtained with the PSPICE simulation engine. All simulations are recalculated with the NGSPICE software using the corrected parameters and compared against the original figures. The reproducibility of our simulations is independently verified with PSPICE, as well as by numerically solving the analytical system of non-linear equations using Newton¿s method …

Electrical Resistivity Anisotropy of Silicon-Doped n-Indium Selenide

Deep Levels in Silicon Doped n-Indium Selenide

Transport properties of silicon doped n-indium selenide

Hall effect and resistivity measurements in silicon doped indium selenide (InSe), from 7K to 500K, are reported. Results are interpreted through a model, previously proposed for tin doped InSe, that takes into account the contribution of both three- and two-dimensional electrons to charge transport along the layers in InSe.