A new cooperative guidance law is proposed for target estimation of multiple unmamed aerial vehicles (UAVs) without involving numerical computational work. The guidance law derivation is based upon the Fisher Information Matrix (FIM) to quantify the amount of target information. For two UAVs, an analytical one-step determinant of FIM is introduced, which sufficiently reflects the trend of previ...

The signal generated by a weak impulse propagates in an oscillatory way and dispersively in a gravitationally compacted granular chain. For the power-law type contact force, we show analytically that the type of dispersion follows power-laws in depth. The power-law for grain displacement signal is given by h − 1 4 (1− 1 p ) where h and p denote depth and the exponent of contact force, and the p...

An adiabatic approach is used to derive a new law for self-focusing in the nonlinear Schr odinger equation that is valid from the early stages of self-focusing until the blowup point. The adiabatic law leads to an analytical formula for the location of the blowup point and can be used to estimate the effects of various small perturbations on self-focusing. The results of the analysis are confir...

In this paper, we analyze and compare four image-based visual servoing control laws. Three of them are classical while a new one is proposed. This new control law is based on a behavior controller to adjust the movement of the camera. It can also be used to switch between the classical methods. An analytical study of all control schemes when translational motion along and rotational motion arou...

The power law wave equation uses two different fractional derivative terms to model wave propagation with power law attenuation. This equation averages complex nonlinear dynamics into a convenient, tractable form with an explicit analytical solution. This paper develops a random walk model to explain the appearance and meaning of the fractional derivative terms in that equation, and discusses a...

Abstract Wear is one of the main mechanical factors that limits survival total knee replacements (TKRs) and it known to be highly dependent on local kinematics joint. In this study, an analytical wear model was coupled a multibody dynamic obtain distribution at lateral medial contact plateaus different TKRs. The major aim analyze if can indicator elevated tibiofemoral misalignment which lead ra...

In this paper, a new local-world evolving network model including triad formation mechanism is proposed and studied. Analytical expressions for degree distribution and clustering coefficient are derived using continuum theory. It is shown that the degree distribution transfers from exponential to power-law scaling, and the clustering coefficient is tunable with known parameters. Finally, the nu...

As the most important working area of gear, teeth play the role of transmitting load and power. Tooth line and tooth profile are the two main characteristics of the tooth surface, which affect the shape of the tooth surface, tooth meshing characteristics and contact characteristics. Taking the elliptical cylinder gear pair in the reversing device of a new type of drum pumping unit as the resear...

apparent agency is one of the new and practical kinds of agencies that have been considered in both legal systems – common law and civil law- and in most laws of different countries in the world – regardless of level of economic and social development - and also in some international documents. its applications have been increased in different field of agency such as legal entities, new employm...

A new method is proposed that can deal with multi-impact problems and produce energetically consistent and unique post-impact velocities. A distributing law related to the energy dispersion is discovered by mapping the time scale into the impulsive scale for bodies composed of rate-independent materials. It indicates that the evolution of the kinetic energy during the impacts is closely associa...