We prove the existence of Sasakian metrics with positive Ricci curvature on certain highly connected odd dimensional manifolds. In particular, we show that manifolds homeomorphic to the 2k-fold connected sum of S × S admit Sasakian metrics with positive Ricci curvature for all k. Furthermore, a formula for computing the diffeomorphism types is given and tables are presented for dimensions 7 and...

OBJECTIVE To describe the circumstances of fall-related injuries among youth 0-19 years treated in emergency departments in Nicaragua; to estimate the incidence rates (IR) of falls; and, to identify areas for prevention efforts. MATERIAL AND METHODS All patients <20 years who were residents of Managua, León, Jinotepe, and Ciudad Sandino (6593) were selected for analysis. Data were collected w...

Global economy is transforming the sources of the competitive advantages of firms, especially for firms embedded in local manufacturing systems. Based on the theoretical contributions to knowledge management and industrial districts, this paper describes alternative firm’s strategies and upgrading options by exploring the relationships among innovation, marketing and network technologies. Start...

Two main trends are emerging in the area of home and service robotics. The classical one aims at the development of a single skilled servant robot, able to perform complex tasks in a passive environment. The second, more recent trend aims at the achievement of domestic tasks through the cooperation of a network of simpler robotic devices pervasively embedded in the environment. This paper contr...

Exposure to indoor allergens can occur both at home and in public places such as schools and workplaces. To investigate and compare the presence of indoor allergens in different kind of environments (schools, offices and homes), dust samples were collected from furniture, desks, mattresses and floors with a standardized procedure. Samples were analyzed for Der p 1, Der f 1, Mite group 2 (mites)...

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In this note I shall continue the study of the geometry of the moduli-space of pairs of points in 3 dimensions. I show that this space, H̃, is the base space of a canonical family of associative k -algebras in dimension 4. The study of the corresponding family of derivations leads to a natural way of introducing an action of the gauge Lie algebras of the Standard Model, in H̃. The results fit wel...

The institution of sweeping the roads, streets and compounds of public buildings in most towns is a public nuisance for which the city fathers are responsible. The dust rises in the air and falls into the houses within its reach, especially into the rooms on the first floor. All such surfaces which harbour loose dust should be watered before they are swept. The floors should be mopped with wet ...

There are two main trends in the area of home and service robotics. The classical one aims at the development of a single skilled servant robot, able to perform complex tasks in a passive environment. The second, more recent trend aims at the achievement of complex tasks through the cooperation of a network of simpler robotic devices pervasively embedded in the domestic environment. This paper ...