This paper presents two new developments for partitioning networks. One is the symmetric-acyclic decomposition of a network and the other is a generalized blockmodeling approach to establish such decompositions of networks. Both are founded in the Davis and Leinhardt (1972) formulation of a ranked clusters model as a theoretical expectation concerning the structure of human groups and affect di...

The story of gastric acid secretion began with early ideas on gastric secretion (Spallanzani and de Réaumur, 17th century) and with first descriptions of food digestion (Dupuytren and Bichat, Beaumont, early 18th century), followed by proof that gastric juice contained acid (Prout, early 18th century). The research continued with first descriptions of gastric glands as the source of gastric aci...

Abstract The harpsichords supposedly owned or played by Handel have long been the subject of scholarly enquiry, in recent years mainly to try match their compasses and disposition his solo music, a strategy also used, for instance, with instruments associated J. S. Bach Mozart. Similarly, Grant O’Brien, John Koster others tried determine how Ruckers-family might used play early 17th-century key...

Contents 1. Introduction. 2. Models of PDE 's in the 18th and 19th century. 3. Methods of calculating solutions in the 19th century. 4. Developments of rigorous theories of solvability in the last decades of the 19th century. 5. The period 18901900: the beginning of modern PDE and the work of Poincare. 6. The Hilbert programs. 7. S. Bernstein and the beginning of a priori estimates. 8. Solvabil...

We investigate the effect of climate change on population growth in 18th and 19th century Iceland. We find that annual temperature changes help determine the population growth rate in pre-industrial Iceland: a year 1◦C cooler than average drives down population growth rates by 0.57% in each of the next two years, for a total effect of 1.14%. We also find that 18th and 19th century Icelanders ad...

This article is an attempt to reconstruct the family history of the Fraris, the famous Sibenik medical family. Three generations of physicians from the Frari family played an important role not only at medical and social scene of Sibenik in the 18th and 19th century, but also in Croatian and Italian medical history. I will try to provide important details on the lives, medical and social work, ...

We investigate the effect of climate change on population growth in 18th and 19th century Iceland. We find that a year 1◦C cooler than average drives down population growth rates by 0.57% in each of the next two years, for a total effect of 1.14%. We also find that 18th and 19th century Icelanders adapt to prolonged changes in climate: these adaptations take about 20 years and reduce the short ...

Transcranial magnetic stimulation has become an important field for both research in neuroscience and for therapy since Barker in 1985 showed that it was possible to stimulate the human motor cortex with an electromagnet. Today for instance, transcranial magnetic stimulation can be used to measure nerve conduction velocities and to create virtual lesions in the brain. The latter option creates ...