Ajay V. Shah

Learn More
The paper reports on the effects of a proton irradiation campaign on a series of thin-film silicon solar cells (singleand double-junction). The effect of subsequent thermal annealing on solar cells degraded by proton irradiation is investigated. A low-temperature annealing behaviour can be observed (at temperatures around 100 to 160 C) for microcrystalline(More)
Optical characterization methods were applied to a series of microcrystalline silicon thin films and solar cells deposited by the very high frequency glow discharge technique. Bulk and surface light scattering effects were analyzed. A detailed theory for evaluation of the optical absorption coefficient a from transmittance, reflectance and absorptance ~with(More)
Carcinoid tumours are relatively rare and, in general, slow growing. They can be "non-functioning" tumours, presenting as a tumour mass, or "functioning" tumours secondary to the production of several biopeptides leading to the carcinoid syndrome. Though these tumours represent 0.25% of an oncology practice, a proper understanding of the clinical course of(More)
The development of mc-Si:H technology and the introduction of intrinsic Ži mc-Si:H as photovotaically active material is retraced. Special emphasis is laid on the use of very high frequency glow discharge as a particularly propitious deposition method for mc-Si:H. Thereby, the use of a gas purifier to reduce oxygen content and obtain intrinsic layers with(More)
Numerous pixel design and process improvements have been driven by the need to maintain or improve image quality at an ever smaller pixel size. A major development in imager technology is the mass production of Backside Illumination (BSI) technology for image sensors at low cost and high yield. The Omnivision-TSMC R&D alliance has been focused on the(More)
Vitamin D status and its relationship to physical performance, falls, and fractures in 495 postmenopausal women of Japanese ancestry in Hawaii were investigated. The mean 25-hydroxyvitamin D (25-OHD) was 31.94 ng/mL. No significant association of 25-OHD was demonstrated with most outcomes, possibly due to higher 25-OHD levels in this population. In this(More)
Undoped hydrogenated microcrystalline silicon (lc-Si:H) layers were grown by the very high frequency glow discharge (VHF-GD) technique under various deposition conditions. The electronic transport properties under illumination were investigated by means of steady-state photoconductivity and steady-state photocarrier grating methods. Similarly to(More)
The amorphous and microcrystalline silicon films have been prepared by hydrogen dilution from pure silane to silane concentrations G1.25%. At silane concentrations of less than 10%, a transition from the amorphous phase to the microcrystalline phase can be observed. X-ray diffraction spectroscopy indicates a preferential growth of the crystallites in w x(More)
The intra-arterial injection of 2–4 dinitrophenol, an uncoupler of oxidative phosphorylation, resulted in the production of ragged red fibers. The ultrastructure of these fibers showed intramitochondrial paracrystalline inclusions, laminar and fingerprint bodies. Antimycin A and oligomycin injection (which inhibit mitochondrial respiration) only caused(More)