Publications de Sri Harsha Kasi Raj

Divertor closure effects on the TCV boundary plasma

Basil Duval, Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Umar Sheikh, Lorenzo Martinelli, Claudia Colandrea, Sri Harsha Kasi Raj

The Tokamak a Configuration Variable (TCV) has recently been equipped with gas baffles to increase its divertor closure for a broad range of divertor magnetic geometries. First experimental results reported in Reimerdes et al. (2021) demonstrated compatibi ...

Elsevier2021

Simulation of epiretinal prostheses - Evaluation of geometrical factors affecting stimulation thresholds

Philippe Renaud, Arnaud Bertsch, Willyan Hasenkamp Carreira, Sri Harsha Kasi Raj, Grégoire Cosendai

Background An accurate understanding of the electrical interaction between retinal prostheses and retinal tissue is important to design effective devices. Previous studies have used modelling approaches to simulate electric fields generated by epiretinal p ...

BioMed Central2011

Simulations to study spatial extent of stimulation and effect of electrode–tissue gap in subretinal implants

Philippe Renaud, Arnaud Bertsch, Sri Harsha Kasi Raj

We present a finite element based simulation and analysis method to describe the spatial extent of stimulation and the effects of electrode–tissue interactions in subretinal prostheses. In particular, we estimate the threshold stimulation current needed to ...

Elsevier2011

Distinguishing drug-induced minor morphological changes from major cellular damage via label-free impedimetric toxicity screening

Philippe Renaud, Arnaud Bertsch, Robert Meissner, Sri Harsha Kasi Raj, Bilge Eker

We present a novel perfusion-based microfluidic platform for label-free drug toxicity screening which can single out non-lethal morphological changes from cellular death using electrical impedance spectroscopy. Minor cellular changes such as cell-cell cont ...

2011

Analysis of Factors Affecting the Performance of Retinal Prostheses Using Finite Element Modelling of Electric Field Distribution in the Retina

Sri Harsha Kasi Raj

This dissertation proposes a computational framework targeted at improving the design of currently employed retinal prostheses. The framework was used for analysing factors impacting the performance of prostheses in terms of electrical stimulation for reti ...

EPFL2011

Modelling and microfabrication of a polyimide-based 3D tissue coupled electrodes for electrical stimulation in the chick retina

Philippe Renaud, Sri Harsha Kasi Raj

We present a new flexible microfabricated polyimide-based platinum array of 3D “tissue coupled electrodes” (TCEs) applied for local stimulation of the chick retinal photoreceptor layer and simultaneous patch clamp recording from a single retinal ganglion c ...

2008

Retinal Prosthesis : Testing Prototypes on a Dystrophic Rat Retina

Philippe Renaud, Olof Pontus Linderholm, Sri Harsha Kasi Raj

2007