Michele Grassi

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Introduction. To a smooth manifold M one can associate in a natural way a new smooth manifold, the manifold of k-jets of n-dimensional submanifolds of M , indicated by G n (M), which parametrizes in a smooth way the k-jets of immersed submanifolds ofM . OnG n (M) one can build in a canonical way a differential ideal, denoted . The cohomology associated to(More)
The expression of transforming growth factor alpha (TGFalpha), amphiregulin (AR) and cripto-1 (CR-1) was assessed by immunohistochemistry in 83 specimens (59 primary ovarian tumors and 24 extra-ovarian carcinomas) that were obtained from 68 ovarian carcinoma patients. Within the 59 primary tumors, 54 (92%) expressed immunoreactive TGFalpha, 45 (76%)(More)
This paper presents a customized three-dimensional template matching technique for autonomous pose determination of uncooperative targets. This topic is relevant to advanced space applications, like active debris removal and on-orbit servicing. The proposed technique is model-based and produces estimates of the target pose without any prior pose(More)
This paper describes the research activity at the university of Naples concerning the study and prototype development of a low-cost APS-based miniature sun sensor for micro/nanosatellites attitude determination. In the paper the sensor architecture is described, as well as the development of its prototype and of the facility for laboratory testing. Part of(More)
This paper describes the high precision digital sun sensor under development at the University of Naples. The sensor determines the sun line orientation in the sensor frame from the measurement of the sun position on the focal plane. It exploits CMOS technology and an original optical head design with multiple apertures. This allows simultaneous multiple(More)
We introduce self-dual manifolds and show that they can be used to encode mirror symmetry for affine-Kähler manifolds and for elliptic curves. Their geometric properties, especially the link with special lagrangian fibrations and the existence of a transformation similar to the Fourier-Mukai functor, suggest that this approach may be able to explain mirror(More)
An optical flow-based technique is proposed to estimate spacecraft angular velocity based on sequences of star-field images. It does not require star identification and can be thus used to also deliver angular rate information when attitude determination is not possible, as during platform de tumbling or slewing. Region-based optical flow calculation is(More)