We construct a large class of projective threefolds with one node (aka non-degenerate quadratic singularity) such that their small resolutions are not projective.

OBJECTIVES We retrospectively reviewed the surgical results of thoraco-abdominal aortic repair using moderate-to-deep hypothermia combined with targeted reconstruction of the Adamkiewicz artery (AKA). METHODS Between 2006 and 2014, 100 patients underwent thoraco-abdominal aortic aneurysm repair using moderate-to-deep hypothermia. Their mean age was 58 ± 15 years and 76 (76%) were men. Their a...

OBJECTIVES Little is known about cannabis use in hunter-gatherers. Therefore, we investigated cannabis use in the Aka, a population of foragers of the Congo Basin. Because cannabis contains anthelminthic compounds, and the Aka have a high prevalence of helminthiasis, we also tested the hypothesis that cannabis use might be an unconscious form of self-medication against helminths. METHODS We c...

The ubiquity of mobile devices has enabled Location-Based Social Networks (LBSN), such as Foursquare and Twitter, to collect large datasets of people’s locations, which tell who has been where and when. Such a collection of people’s locations over time (aka spatiotemporal data) is a rich source of information for studying various social behaviors. One particular behavior that has gained conside...

We study the recursion (aka Schur) parameters for monic polynomials orthogonal on the unit circle with respect to a weight which provides negative answer to the conjecture of Steklov.

As human languages are increasingly dying out, the discovery of a new one is striking. Nigel Williams reports. The UN's atlas of endangered languages lists around 230 that have become extinct during the past 60 years. And it is now widely agreed that around 3,000 languages worldwide are endangered and 200 are critically endangered with fewer than 10 speakers. Even in Europe, Karaim, in western ...

Multiple hop routing in mobile ad hoc networks can minimize energy consumption and increase data throughput. Yet, the problem of radio interferences remain. However if the routes are restricted to a basic network based on local neighborhoods, these interferences can be reduced such that standard routing algorithms can be applied. We compare different network topologies for these basic networks,...

In October 2007, a joint meeting was held successfully on Zijinggang campus of Zhejiang University, Hangzhou, China, between the Chinese Comparative Physiology Committee (CCPC) of the Chinese Association for Physiological Sciences (CAPS) and a consortium of scientists from around the world under the umbrella of comparative physiology, biochemistry, and toxicology. Hangzhou is situated in the gr...

As human languages are increasingly dying out, the discovery of a new one is striking. Nigel Williams reports. The UN's atlas of endangered languages lists around 230 that have become extinct during the past 60 years. And it is now widely agreed that around 3,000 languages worldwide are endangered and 200 are critically endangered with fewer than 10 speakers. Even in Europe, Karaim, in western ...