We observe that linear relations among Chern-Mather classes of projective varieties are preserved by projective duality. We deduce the existence of an explicit involution on a part of the Chow group of projective space, encoding the effect of duality on Chern-Mather classes. Applications include Plücker formulae, constraints on self-dual varieties, generalizations to singular varieties of class...

We generalize to higher dimension results of Birkhoff and Mather on the existence of orbits wandering in regions of instability of twist maps. This generalization is strongly inspired by the one proposed by Mather in [7]. However, its advantage is that it contains most of the results of Birkhoff and Mather on twist maps. A very natural class of problems in dynamical systems is the existence of ...

India faces a formidable burden of neonatal deaths, and quality newborn care is essential for reducing the high neonatal mortality rate. We examined newborn care services, with a focus on essential newborn care (ENC) in two districts, one each from two states in India. Nagaur district in Rajasthan and Chhatarpur district in Madhya Pradesh were included. Six secondary-level facilities from the d...

Let L be an autonomous Tonelli Lagrangian on a closed manifold of dimension two. Let C be the set of cohomology classes whose Mather set consists of periodic orbits, none of which is a fixed point. Then for almost all c in C, the Aubry set of c equals the Mather set of c.

BACKGROUND AND AIM OF THE STUDY The performance and longevity of bioprosthetic heart valves are limited by tissue calcification and degeneration after implantation. Experimental valve replacement in large animal models forms an important component of the preclinical evaluation of these bioprosthetic heart valves. The study aim was to assess the feasibility of a mitral model for stentless valves...

Previous research has demonstrated that older adults prefer less autonomy and seek less information when making decisions on their own relative to young adults (for a review, see M. Mather, 2006). Would older adults also prefer fewer options from which to choose? The authors tested this hypothesis in the context of different decision domains. Participants completed a choice preferences survey i...

OBJECTIVE To evaluate the results of the kangaroo mother method in Brazil. METHODS A prospective cohort study comparing 16 units that have or do not have the second phase of the kangaroo mother method: eight were national centers of excellence for the kangaroo mother method (study group) and eight were part of the Brazilian Neonatal Research Network (control group). A total of 985 newborn inf...

Disturbance is a major factor determining the plant community structure of ecological systems. In particular, small-scale disturbances from animals can increase heterogeneity and species diversity in plant communities. Kangaroo rat (Dipodomys spectabilis) mounds are small-scale disturbances that support unique plant communities compared to surrounding habitats. The seed bank, which is usually a...

The global agenda for improved neonatal care includes the scale-up of kangaroo mother care (KMC) services. The establishment of district clinical specialist teams (DCSTs) in South Africa (SA) provides an excellent opportunity to enhance neonatal care at district level and ensure translation of policies, including the requirement for KMC implementation, into everyday clinical practice. Tshwane D...