Few studies have evaluated the efficiency of methods for sampling ants, especially in regions with highly variable vegetation physiognomies such as the Cerrado region of central Brazil. Here we compared three methods to collect ground-dwelling ants: pitfall traps, sardine baits, and the Winkler litter extractor. Our aim was to determine which method would be most appropriate to characterize the...

Theoretical research has numerous challenges, particularly about modeling structures, unlike experimental analysis, which explores the mechanical behavior of complex structures. Therefore, this study suggests a new model for functionally graded shell structures called “Tri-coated FGM” using spatial variation material properties to investigate free vibration response incorporating porosities and...

Abstract Background Soft, biological, and bio-inspired materials are often compositionally heterogeneous structurally anisotropic, they frequently feature graded or layered organizations. This design complexity enables exceptional ranges in properties performance yet complicates a fundamental understanding of the contact mechanics. Recent studies soft gel layers have relied on Hertzian Winkler ...

On the basis of an asymptotic approach to solving elasticity theory boundary value problem for a thin strip rigidly linked non-deformable base, differential equations are derived determining normal and shear loads distributed on face free from fastening. These used solve contact rigid cylinder with elastic rim horizontal rough support surface. The loading by vertical force is considered given c...

R Koehler*, E Grünig*, M W Pauciulo*, M M Hoeper, H Olschewski, H Wilkens, M Halank, J Winkler, R Ewert, H Bremer, S Kreuscher, B Janssen, W C Nichols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Steinhausen HC, Winkler Metzke CW. The impact of suicidal ideation in preadolescence, adolescence, and young adulthood on psychosocial functioning and psychopathology in young adulthood. Acta Psychiatr Scand 2004;110:438–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

R Koehler*, E Grünig*, M W Pauciulo*, M M Hoeper, H Olschewski, H Wilkens, M Halank, J Winkler, R Ewert, H Bremer, S Kreuscher, B Janssen, W C Nichols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

We consider a disc-shaped thin elastic sheet bonded to a compliant sphere. (Our sheet can slip along the sphere; the bonding controls only its normal displacement.) If the bonding is stiff (but not too stiff), the geometry of the sphere makes the sheet wrinkle to avoid azimuthal compression. The total energy of this system is the elastic energy of the sheet plus a (Winkler-type) substrate energ...

The emerging concept of active constrained layer control of vibrating structures involved the application of a viscoelastic layer constrained by a piezoelectric constrained layer. Attempts have been made to optimize the performance of the constrained layer treatments by selecting the optimal thickness, length, elasticity of the viscoelastic core [1, 2, 3]. This paper deals with the control of d...