Extending the notion of pattern avoidance in permutations, we study matchings and set partitions whose arc diagram representation avoids a given configuration of three arcs. These configurations, which generalize 3-crossings and 3-nestings, have an interpretation, in the case of matchings, in terms of patterns in full rook placements on Ferrers boards. We enumerate 312-avoiding matchings and pa...

J Am Med Inform Assoc. 2008;15:321–323. DOI 10.1197/jamia.M241.

in this paper, the electrochemical behaviour of passive films formed on aisi 321 stainless steel (aisi 321)immersed in 0.1 m naoh + 0.1 m koh solution was evaluated by different electrochemical techniques. forthis purpose, passive films were formed at open circuit potential for 1 to 12 hours and then electrochemicalmeasurements were done. the polarization curves suggested that aisi 321 showed e...

ion: a graph oriented approach, Artificial Intelligence 85, pp. 321-261, 1996.

[This corrects the article on p. 321 in vol. 32, PMID: 27493607.].

RESENHA GAGO, Veronica (2020), A potencia feminista ou o desejo de transformar tudo. Sao Paulo, Editora Elefante, p. 321.

Several initiatives have been launched to reinforce countries’ efforts to scale up programmes for the prevention of mother-to-child transmission (PMTCT) of human immunodeficiency virus (HIV) infection, though the shift from donor-funded projects and limited initiatives towards nationwide programmes is very slow. Coverage of PMTCT programmes and uptake of services provided through them are still...

It is well-known, and was first established by Knuth in 1969, that the number of 321-avoiding permutations is equal to that of 132-avoiding permutations. In the literature one can find many subsequent bijective proofs of this fact. It turns out that some of the published bijections can easily be obtained from others. In this paper we describe all bijections we were able to find in the literatur...

We introduce the notion of 321-avoiding permutations in the affine Weyl group W of type An−1 by considering the group as a George group (in the sense of Eriksson and Eriksson). This enables us to generalize a result of Billey, Jockusch and Stanley to show that the 321-avoiding permutations in W coincide with the set of fully commutative elements; in other words, any two reduced expressions for ...

http://cpr.sagepub.com/content/12/4/321 The online version of this article can be found at: DOI: 10.1097/01.hjr.0000173108.76109.88 2005 12: 321 Journal of Cardiovascular Risk Joep Perk, Hugo Saner and Luc Vanhees Dorian Dugmore, Paolo Fioretti, Dan Gaita, Rainer Hambrecht, Irene Hellermans, Hannah McGee, Miguel Mendes, Ugo Corrá, Pantaleo Giannuzzi, Stamatis Adamopoulos, Hans Bjornstad, Birna ...