Coriolis effects on nonlinear oscillations of rotating cylinders and rings

The effects which moderately large deflections have on the frequency spectrum of rotating rings and cylinders are considered. To develop the requisite solution, a variationally constrained version of the Lindstedt-Poincare procedure is employed. Based on the solution developed, in addition to considering the effects of displacement induced nonlinearity, the role of Coriolis forces is also given special consideration

Nonlinear hierarchical substructural parallelism and computer architecture

Computer architecture is investigated in conjunction with the algorithmic structures of nonlinear finite-element analysis. To help set the stage for this goal, the development is undertaken by considering the wide-ranging needs associated with the analysis of rolling tires which possess the full range of kinematic, material and boundary condition induced nonlinearity in addition to gross and local cord-matrix material properties

Thermomechanically induced pre- and postbuckling of general structure

An algorithmic solution strategy which enables handling the positive/indefinite stiffness characteristics associated with the pre and postbuckling of structures subject to complex thermomechanical loading fields was developed. The flexibility of the procedure is such that it can be applied to both finite difference and element type simulations. Due to the generality of the algorithmic approach developed, both kinematic and thermal/mechanical type material nonlinearity including inelastic effects can be treated. This includes the possibility of handling completely general thermomechanical boundary conditions. To demonstrate the scheme, the results of several benchmark problems are presented

A binary system of complementizers in Cimbrian relative clauses

The system of Cimbrian relative clauses manifests itself in a complex scenario: two different complementizers occur in this context: i) the ‘autochthonous’ (Germanic) bo, cognate of Southern German wo, and ii) the ‘allochthonous’ ke, borrowed from Italian (che), which is gradually spreading. In our paper we provide empirical evidence for a crucial specialization of both complementizers: the former shows up only in restrictive relative clauses, the latter in both restrictive and non-restrictive relatives, giving rise to a binary system. In our analysis we aim to explain the binary system of Cimbrian relative complementizers directly addressing the general discussion about relative clauses, showing once more the relevance of both linguistic contact and microvariation for the theory of grammar

Hierarchical Poly Tree Configurations for the Solution of Dynamically Refined Finte Element Models

This paper demonstrates how a multilevel substructuring technique, called the Hierarchical Poly Tree (HPT), can be used to integrate a localized mesh refinement into the original finite element model more efficiently. The optimal HPT configurations for solving isoparametrically square h-, p-, and hp-extensions on single and multiprocessor computers is derived. In addition, the reduced number of stiffness matrix elements that must be stored when employing this type of solution strategy is quantified. Moreover, the HPT inherently provides localize 'error-trapping' and a logical, efficient means with which to isolate physically anomalous and analytically singular behavior

Effects of a simulated heat wave on spatial cognitive abilities and associative learning in the guppy, Poecilia reticulata

openGlobal warming is leading to a greater frequency of heat waves, generally defined as an increase in temperature of at least 5°C compared to the average maximum temperature for at least 5 days. Heat waves do not only increase mortality in animals, but can also have important consequences on behavioral traits, including cognitively demanding behavioral traits, which in turn can influence mortality and reproductive success. Thermal condition is well documented to affect behavioral traits in freshwater teleosts, and like most organisms, freshwater communities will have to deal with an increasing number of extreme heat events in the coming decades. The consequences for behavior and, specifically, for the cognitive capacities underlying behavior remain largely unknown. Here, we tested the effects of a simulated heat wave on spatial cognitive abilities and associative learning in the model organism Poecilia reticulata. Previous studies have demonstrated the ability of guppies to learn to navigate a simple maze, decreasing their exit time after each trial. Therefore, we used maze learning as an indicator of spatial cognitive abilities in order to test whether heat waves affect cognition.Global warming is leading to a greater frequency of heat waves, generally defined as an increase in temperature of at least 5°C compared to the average maximum temperature for at least 5 days. Heat waves do not only increase mortality in animals, but can also have important consequences on behavioral traits, including cognitively demanding behavioral traits, which in turn can influence mortality and reproductive success. Thermal condition is well documented to affect behavioral traits in freshwater teleosts, and like most organisms, freshwater communities will have to deal with an increasing number of extreme heat events in the coming decades. The consequences for behavior and, specifically, for the cognitive capacities underlying behavior remain largely unknown. Here, we tested the effects of a simulated heat wave on spatial cognitive abilities and associative learning in the model organism Poecilia reticulata. Previous studies have demonstrated the ability of guppies to learn to navigate a simple maze, decreasing their exit time after each trial. Therefore, we used maze learning as an indicator of spatial cognitive abilities in order to test whether heat waves affect cognition

Finite element for rotor/stator interactive forces in general engine dynamic simulation. Part 1: Development of bearing damper element

A general purpose squeeze-film damper interactive force element was developed, coded into a software package (module) and debugged. This software package was applied to nonliner dynamic analyses of some simple rotor systems. Results for pressure distributions show that the long bearing (end sealed) is a stronger bearing as compared to the short bearing as expected. Results of the nonlinear dynamic analysis, using a four degree of freedom simulation model, showed that the orbit of the rotating shaft increases nonlinearity to fill the bearing clearance as the unbalanced weight increases