Abstract— In this paper, input impedance of a vertical rod under lightning stroke is first computed by applying the method of moments (MoM) on the Maxwell’s equations. The circuit model is then achieved through applying modified vector fitting (MVF) on the computed input impedance. After then the equivalent circuit is again extracted for a few values of soil conductivity and rod radius. Finally...

The buckling behavior of rod strings in wellbore is one of the key issues in petroleum engineering. The slender rod strings in vertical wellbore were selected as research objects. Based on the energy method, the critical load formulas of sinusoidal and helical buckling were derived for the string with the bottom of the wellbore pressure. According to the sinusoidal and helical buckling’s geomet...

In this paper, using neural networks based on radial basis functions (RBF), a comprehensive closed-form solution for effective length of vertical grounding rod is extracted in such a way that the two effects of ionization and dispersion are simultaneously considered. In creating the model, training data are computed from multi-conductor transmission line (MTL). As a results, firstly in the prop...

The foraging behavior of lacewing larvae (Chrysopa carnea Stephens, Chrysopidae, Neuroptera) on vertical lucite rods was observed under a variety of experimental conditions to investigate the decision processes responsible for the distribution of foraging effort. Food deprivation increased the duration of searching on all parts of the rod, whereas contact with prey at the rod tip induced only a...

This study investigates whether the vertical orientation may be predominantly used as an amodal reference norm by the visual, haptic, and somato-vestibular perceptual systems to define oblique orientations. We examined this question by asking the same sighted adult subjects to reproduce, in the frontal (roll) plane, the vertical (0 degree) and six oblique orientations in three tasks involving d...

When making orientational judgements, such as aligning picture frames or positioning for a golf swing, we maneuver rather than remaining immobile. This observation is at odds with many psychophysical studies of spatial orientation. Accurate perception of spatial orientation is of greatest importance when it is imperative to maintain precarious balance. It has been proposed [1,2] that, when bala...

We model the behavior of a big Brazil nut in a medium of smaller nuts with a stochastic asymmetric simple exclusion dynamics of a polymer monomer lattice system The polymer or rod can move up or down in an external negative eld occupying N horizontal lattice sites where the monomers cannot enter The monomers at most one per site or uid particles are moving symmetrically in the horizontal plane ...

Rod and Frame Testing (RFT) has been used to investigate the effects of an altered visual frame reference on subjective vertical. RFT requires individual align a luminous rod as best they can with true