When lifting an object, the brain uses visual cues and an internal object representation to predict its weight and scale fingertip forces accordingly. Once available, tactile information is rapidly integrated to update the weight prediction and refine the internal object representation. If visual cues cannot be used to predict weight, force planning relies on implicit knowledge acquired from re...

A slowed-rotor compound helicopter has been synthesized using the NASA Design and Analysis of Rotorcraft (NDARC) conceptual design software. An overview of the design process and the capabilities ofNDARC are presented. The benefits of trading rotor speed, wing-rotor lift share, and trim strategies are presented for an example set of sizing conditions and missions. NOMENCLATURE Acronyms DGW Desi...

Let G be an edge-weighted hypergraph on n vertices, m edges of size O(1), where the edges have real weights in an interval [1, W ]. We show that if we can approximate a maximum weight matching in G within factor α in time T (n,m,W ) then we can find a matching of weight at least (α − ǫ) times the maximum weight of a matching in G in time (ǫ) max 1≤q≤O(ǫ log n ǫ log ǫ−1 ) maxm1+...mq=m ∑q 1 T (n...

background and aim . vertical and horizontal bone resorption of the alveolar ridge are common in edentulous jaws. in the distal area of the maxilla, an adequate bone volume is often lacking because of the proximity of the sinus cavities to crestal bone. sinus floor augmentation is an established way of increasing the height and volume of bone in the posterior region of the maxilla, which increa...

The reciprocating-airfoil (RA) driven vertical take-off and landing (VTOL) aircraft is a new concept that utilizes the reciprocating motion of wings to provide lift for landing. RA are shaped like fixed-wing airplane work as fixed while cruising. wing undergoes substantial linear during may generate similar aircraft. unique structural characteristics their high inertia lifting force loadings. T...