Polarizable liquids respond to a non-uniform electric "eld by collecting preferentially in regions of maximum "eld intensity. This manifestation of dielectrophoresis (DEP) is a wellknown example of the ponderomotive force, with the "eld acting on individual (molecular) dipoles in the liquid. When electrode dimensions are scaled down to &10 to 100 m, liquid DEP makes possible a new type of high-...

In this project, three members of the Armed Forces tested the multi-disciplinary system design optimization approach to concept evaluation on a simplified platform, a barge. A barge is a non-self propelled vessel that incorporates the basic disciplines of ship building: hydrodynamics, hydrostatics, and structural mechanics. Using four bounded design variables, we attempt to optimize the payload...

We now begin to trace the journey towards a star. How long does this take? The answer is surprisingly short: a good many clouds already contain new stars and these stars tend to be young. The typical cloud cannot spend long, if any time at all, in a dormant state. The first challenge is to accumulate gas into a molecular cloud. One dilemma is to decide what occurred first: the production of the...

The problem is that to date there no general theory of the granular state matter in a closed form. However, are some well-developed models use, for example, representation continuous environment. Typical bulk material large conglomeration micro-mechanical particles different sizes and shapes interact with each other walls contain containers by mainly repulsive forces direct mechanical contact (...

One of the main problems to be taken into account is availability a reliable amount information during preliminary design stages. The present paper focused on analysis results obtained for several versions developed based initial version river chemical tanker, using so-called jumboisation which technique in shipbuilding, consisting enlarging ship by adding an entire section it. Moreover, breadt...

INTRODUCTION This paper focuses on the development of optimal deterministic, nonlinearly coupled barge motion models, identification of their system parameters and calibration of their prediction capability using experimental results. The ultimate objective is to develop accurate yet sufficiently low degree-offreedom stochastic models suitable for efficient probabilistic stability and reliabili...

As discussed in Gómez & Cox (2002), the extra stiffness that the magnetic field adds to the ISM changes the way it reacts to the presence of a spiral perturbation. At intermediate to high z, the gas shoots up before the arm, flows over, and falls behind it, as it approaches the next arm. This generates a multicell circulation pattern, within each of which the net radial mass flux is positive ne...

This article reviews the author's investigations on the perception and control of spatial relations if the carriers of the relevant sense organs are mobile and controlled independently of each other. In the dragonfly, head rotation is controlled by the head's inertia, as well as by cervicocollic, optokinetic, and dorsal light reflexes and, in turn, controls trunk rotation by means of neck refle...

Hard Sciences, and Mathematics in particular, are often abstract disciplines; our difficulties are both in learning and teaching them, and we need to explain concepts through visual examples, models, real objects’ manipulation. It is fundamental to find a good teaching strategy, and new multimedia tools can help us. The “Domus Archimedea” is an Interactive Science and Technology Museum dedicate...