Linear stability and positivity results for a generalized size-structured Daphnia model with inflow§

We employ semigroup and spectral methods to analyze the linear stability of positive stationary solutions of a generalized size-structured Daphnia model. Using the regularity properties of the governing semigroup, we are able to formulate a general stability condition which permits an intuitively clear interpretation in a special case of model ingredients. Moreover, we derive a comprehensive instability criterion that reduces to an elegant instability condition for the classical Daphnia population model in terms of the inherent net reproduction rate of Daphnia individuals

Dispositivo fotorivelatore ultrasensibile con diaframma micrometrico integrato per microscopi confocali

La presente invenzione concerne un dispositivo fotorivelatore comprendente un substrato di semiconduttore di un primo tipo di conducibilità connesso ad un primo elettrodo. Tale substrato comprende un'area attiva formata da diverse regioni di semiconduttore di un secondo tipo di conducibilità, isolate fra loro e connesse a rispettivi secondi elettrodi in modo che ciascuna di esse sia collegabile separatamente dalle altre ad una appropriata tensione di polarizzazione

High sensitivity photodetector device with integrated micrometric diaphragm for confocal microscopes

Photodetector device comprising a semiconductor substrate of a first type of conductivity connected to a first electrode. Said substrate comprises an active area made up of different semiconductor regions of a second type of conductivity insulated from each other and connected to respective second electrodes so that each of them can be connected separately from the others to an appropriate bias voltage. By regulating the bias voltages applied to these regions the function of optic diaphragm of the device can be controlled. The device works without needing any form of optical insulation between the different regions of the active area and always uses the same single output electrode for the signal in all the different situations of diaphragm adjustment