65 research outputs found
The Kodaira dimension of the moduli of K3 surfaces
The moduli space of polarised K3 surfaces of degree 2d is a quasi-projective
variety of dimension 19. For general d very little has been known about the
Kodaira dimension of these varieties. In this paper we present an almost
complete solution to this problem. Our main result says that this moduli space
is of general type for d>61 and for d=46,50,54,58,60.Comment: 47 page
Numerical properties of isotrivial fibrations
In this paper we investigate the numerical properties of relatively minimal
isotrivial fibrations \varphi \colon X \lr C, where is a smooth,
projective surface and is a curve. In particular we prove that, if and is neither ruled nor isomorphic to a quasi-bundle, then K_X^2
\leq 8 \chi(\mO_X)-2; this inequality is sharp and if equality holds then
is a minimal surface of general type whose canonical model has precisely two
ordinary double points as singularities. Under the further assumption that
is ample, we obtain K_X^2 \leq 8 \chi(\mO_X)-5 and the inequality is
also sharp. This improves previous results of Serrano and Tan.Comment: 30 pages. Final version, to appear in Geometriae Dedicat
Respiratory failure due to tracheobronchomalacia.
A case is described of tracheobronchomegaly progressing to extensive tracheomalacia, complicated by episodic choking, recurrent pulmonary infections, and irreversible hypercapnic respiratory failure. A Y-shaped tracheobronchial stent was placed endoscopically to splint the trachea open, with excellent clinical and physiological improvement. New stent designs may provide long term palliation in selected cases of diffuse tracheal collapse or stenosis, and offer an alternative to surgical repair
Advanced module for model parameter extraction using global optimization and sensitivity analysis for electron-beam proximity effect correction
International audienc
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