NASA participation in the AMST program

The objectives of the NASA Advanced Medium STOL Transport Experiments Program are discussed and several of the NASA experiments currently implemented and conducted on the YC-14 and YC-15 prototype aircraft are described. Emphasis is placed on experiments related to powered lift aerodynamics and acoustics

Arritmias cardíacas en la clínica del perro y del gato : una revisión bibliográfica y su enfoque práctico

En el presente trabajo los autores realizan una revisión del sistema intrínseco de conducción eléctrica intracardïaco, los mecanismos de generación de arritmias y una revisión práctica de las alteraciones electrocardiográficas más habituales en la clínica diaria con especial atención a su diagnóstico, posible etiología y tratamiento.In this article, the authors present a review of the conduction system and arrhythmia generation in the dog and cat, and their findings on clinical work with ECG alterations in the dog and cat, with special atenrior: to their diagnosis, causes and therapeutical approach

The Bak-Sneppen Model on Scale-Free Networks

We investigate by numerical simulations and analytical calculations the Bak-Sneppen model for biological evolution in scale-free networks. By using large scale numerical simulations, we study the avalanche size distribution and the activity time behavior at nodes with different connectivities. We argue the absence of a critical barrier and its associated critical behavior for infinite size systems. These findings are supported by a single site mean-field analytic treatment of the model.Comment: 5 pages and 3 eps figures. Final version appeared in Europhys. Let

Bioinspired snapping-claw apparatus to study hydrodynamic cavitation effects on the corrosion of metallic samples

A creative low-cost and compact mechanical device that mimics the rapid closure of the pistol shrimp claw was used to conduct electrochemical experiments, in order to study the effects of hydrodynamic cavitation on the corrosion of aluminum and steel samples. Current-time curves show significant changes associated with local variations in dissolved O2 concentration, cavitation-induced erosion and changes in the nature of the surface corrosion products

The Policy Communication Index: a theoretically-based measure of organizational policy communication practices

Despite recent scholarly contributions regarding policy communication, much remains to be known about policy communication processes. This article reports two studies that resulted in a survey instrument that measures policy communication in organizations. Study One included 197 full-time employees across occupations and industries. Exploratory factor analysis resulted in five factors of the Policy Communication Index: Meeting Discussions, Human Resources Communication, Coworker Interactions, Supervisor/Coworker Written Instructions, and Personal Expressions. Study Two included 245 full-time employees across job functions and industries. Confirmatory factor analysis confirmed a five-factor Policy Communication Index. Results are interpreted with structurating activity theory and implications are posed for future organizational communication research and practice