We study the general properties of rank two s-Kähler manifolds. We present several natural examples of manifolds which can be equipped with this structure with various levels of rigidity: complex tori and abelian varieties, cotangent bundles of smooth manifolds and moduli of pointed elliptic curves. We show how one can obtain natural bundles of Lie algebras on such manifolds, with fibres isomor...

Conversion of relational data to XML is a critical topic in the database area. This approach translates the rigid tabular structures of relational databases into hierarchical XML structures. Logical connections between bits of data depicted by relationships are represented more naturally by tree-like structures. Conv2XML and ConvRel are two algorithms for converting relational schema to XML Sch...

We present a general framework for the modelling of a class of mechanical systems for robotic manipulation, consisting of articulated limbs with redundant tendinous actuation and unilateral constraints. Such systems, that include biomorphically designed devices, are regarded as a collection of rigid bodies, interacting through connections that model both joints and contacts with virtual sprin s...

EM1 associated with inter-board connection was studied through common-mode current measurements and FDTD modeling for stacked-card and module-on-backplane configurations. Three types of connections were investigated experimentally including an open pin field connection, an “ideal” semi-rigid coaxial cable connection, and a production connector. Both microstrip and stripline signal routing on th...

A high-order (up to 6th order) Navier-Stokes solver is coupled with a structural solver that decomposes the equations of three-dimensional elasticity into cross-sectional, smalldeformation and spanwise, large-deformation analyses for slender wings. The resulting high-fidelity aeroelastic solver is applied to the investigation of both a rigid and moderately flexible rectangular wing undergoing a...

An arithmetic circuit is a directed acyclic graph in which the operations are {+,×}. In this paper, we exhibit several connections between learning algorithms for arithmetic circuits and other problems. In particular, we show that: • Efficient learning algorithms for arithmetic circuit classes imply explicit exponential lower bounds. • General circuits and formulas can be learned efficiently wi...

We study the properties of affine rigidity of a hypergraph and prove a variety of fundamental results. First, we show that affine rigidity is a generic property (i.e., depends only on the hypergraph, not the particular embedding). Then we prove that a graph is generically neighborhood affinely rigid in d-dimensional space if it is (d+1)-vertex-connected. We also show neighborhood affine rigidit...

The present approach for vibration suppression of flexible structures is based on friction damping in semi-active joints. At optimal locations conventional rigid connections of a large truss structure are replaced by semi-active friction joints. Two different concepts for the control of the normal forces in the friction interfaces are implemented. In the first approach each semi-active joint ha...

www.MaterialsViews.com C O M M High-Density Stretchable Electronics: Toward an Integrated Multilayer Composite U N IC By Liang Guo and Stephen P. DeWeerth * A IO N In recent years, interest has developed for implementing electronics using fl exible, foldable, and even stretchable materials; the potential applications of such technologies include consumer products ranging from fl exible/elastic ...