Unexpected energy increases during Earth flybys of both the Galileo and Near Earth Asteroid Rendezvous (NEAR) spacecraft have drawn evidence of spacecraft trajectory modeling errors, an unknown perturbing force or failure of Newtonian gravity. This paper will investigate the gravity field of Earth as a possible source of these anomalous AVs. Other possible sources of errors have been considered...

Relationships between shifts of the center of gravity and electromyographic activities (EMGs) were investigated in man during standing. The EMG was mainly obtained from the gastrocnemius and soleus muscles (GS), but other muscles, such as hamstring, tibialis anterior and quadriceps muscles were also included. The shift of gravity center was measured as a change in foot pressure. A forward shift...

In this paper, we present a novel actuation system for mobile phones: An actuated center of gravity. We present a number of applications, including interactive feedback, notification and the usage of the system as an ambient display. We present the results of an initial user study, in which the users were asked to estimate the position of the device’s center of gravity. The results indicated th...

Today, researchers exploit hybrid craft more than they used to be. The main reason is that they need to high speed as well as extra portability. For instance, a famous hybrid craft is named Hysucat, was designed through the combination of catamaran and hydrofoil. Catamarans, a type of multihull boats, have always considered by designers because of their simultaneous supply of high speed and sta...

in gravity interpretation, inversion algorithms have been used widely over the years, but as the potential follows the gauss theorem, there are many equivalent source distributions that can produce the same known field. so to obtain a unique solution, suitable constraints should be introduced to the algorithm. during the last decades many authors have used several approaches to introduce a prio...