Marche Polytechnic University

About: Marche Polytechnic University is a education organization based out in Ancona, Italy. It is known for research contribution in the topics: Population & Cancer. The organization has 5905 authors who have published 15769 publications receiving 382286 citations. The organization is also known as: Universitá Politecnica delle Marche & Universita Politecnica delle Marche.

Emissions from Ethers and Organic Carbonate Fuel Additives: A Review

Abstract: This paper is a review of the available literature on the main features of 11 of the most widely adopted oxygenated additives to base gasoline and diesel, focusing particularly on the emissions from the oxygenates considered as additives. The oxygenated additives studied are methyl tert-butyl ether, ethyl tertiary butyl ether, tert-amyl ethyl ether, tertiary amyl methyl ether, isopropyl ether, dimethyl carbonate, dimethoxymethane, dibutyl ether, diglycol methyl ether, diethyl carbonate, and 2-methoxyethyl acetate.

Characteristics of a black coral meadow in the twilight zone of the central Mediterranean Sea

Abstract: The hard substrata of the Mediterranean twilight zone commonly host the large, white, branched Antipathella subpinnata (Antipatharia, Myriopathidae). We discovered one of the largest populations of this black coral ever recorded in the Mediterranean Sea, forming a meadow of thou- sands of colonies in the deep waters off the Calabrian coast (South Italy, Tyrrhenian Sea). The meadow extends from 50 to 100 m depth and is a mixed assemblage of black coral and gorgonian colonies showing specific bathymetric ranges. Antipatharians inhabit the northern slopes of the explored rocky pinnacles receiving the northward moving current of the Strait of Messina. Up to 44% of the black corals are colonized by several encrusting epibionts. A. subpinnata deserves protection since it creates an important 3-dimensional habitat and represents the most characteristic component of the lower fringe of the circalittoral twilight environment in the Mediterranean Sea.

A variational model for fracture mechanics - Numerical experiments

Abstract: In the variational model for brittle fracture proposed in Francfort and Marigo [1998. Revisiting brittle fracture as an energy minimization problem. J. Mech. Phys. Solids 46, 1319–1342], the minimum problem is formulated as a free discontinuity problem for the energy functional of a linear elastic body. A family of approximating regularized problems is then defined, each of which can be solved numerically by a finite element procedure. Here we re-formulate the minimum problem within the context of finite elasticity. The main change is the introduction of the dependence of the strain energy density on the determinant of the deformation gradient. This change requires new, more general existence and Γ -convergence results. The results of some two-dimensional numerical simulations are presented, and compared with corresponding simulations made in Bourdin et al. [2000. Numerical experiments in revisited brittle fracture. J. Mech. Phys. Solids 48, 797–826] for the linear elastic model.