Through laboratory experiments we examine internal wave generation above and in the lee of finite-amplitude periodic topography having various degrees of roughness. We show that internal waves are generated not only by flow over the hills but also by flow over “boundary-trapped” lee waves and by vigorous turbulence created in the lee of sharp-crested hills. For low values of the excitation freq...

The valley of the Berhampootra is encircled with mountains or hills of various heights on all sides, except on the west, "where it opens into the plains of Bengal. The southern extremity of this valley is bounded by a continuous range of hills, "Which have been artificially divided into the Garrow hills, the Cossyah and Jyntea hills, and the Naga hills ; these designations signify that this con...

Limestone hills are now gaining global conservation attention as hotspots for short-range endemic species. Levels of land snail endemism can be high at limestone hills, especially at hill clusters that are geographically isolated. In the State of Perak, Peninsular Malaysia, limestone hills have been opportunistically surveyed for land snails in the past, but the majority have yet to be surveyed...

Strength and ductility are two of the most important mechanical properties of structural materials. However, they are often mutually exclusive, i.e., a material may be strong or ductile, but rarely both at the same time. This is also true for bulk nanostructured materials, which usually have high strength, but disappointingly low ductility. Bulk nanostructured materials are usually synthesized ...

The failure process ahead of a mode I crack advancing in a ductile thin metal plate or sheet produces plastic dissipation through a sequence of deformation steps that include necking well ahead of the crack tip and shear localization followed by a slant fracture in the necked region somewhat closer to the tip. The objective of this paper is to analyze this sequential process to characterize the...

1 Department of Pharmaceutics, Seven Hills College of Pharmacy, Tirupathi, AP, India. 2 Faculty, Department of Pharmaceutics, OMER EL MUKHTAR University, Al-Beida, Libiya 3 Department of Pharmaceutical Chemistry, Shankarlingam Bhuvaneswari College of Pharmacy, Sivakasi, TN,India 4 Principal, Seven Hills College of Pharmacy, Tirupathi, AP, India 5 Research Director, Seven Hills College of Pharma...

In this study, the effect of a tackifier on viscoelastic and adhesion properties acrylic pressure-sensitive adhesives (PSAs) was investigated. The intermediate products in process PSA synthesis, including an acrylate-based copolymer solution, cross-linked copolymer, final product with tackifier, were prepared characterized using dynamic mechanical analysis (DMA). A significant increase storage ...

Incremental sheet forming (ISF) requires no or partial dies for metal fabrication and is widely used small batch production. In this process, necking either suppressed delayed due to the localized nature of tool–sheet contact; hence, more strains than conventional stamping deep drawing are obtained. present study, two variations ISF, namely cold ISF (CISF) warm (WISF), compared. First, FEA mode...

When a macroscopic metallic wire is subject to tensile stress, it necks down smoothly as it elongates. We show that nanowires with radii comparable to the Fermi wavelength display remarkably different behavior. Using concepts from fluid dynamics, a partial differential equation for nanowire shape evolution is derived from a semiclassical energy functional that includes electron-shell effects. A...