57 research outputs found
On the identity of Festuca jubata Lowe (Poaceae) and the description of a new Festuca species in the Azores Islands
The majority of authors consider Festuca jubata Lowe as an endemic species common to Madeira and the Azores.
Saint-Yves proposed that F. jubata was an Azorean endemic and described a geovicarious taxon in Madeira:
F. filiformis C. Sm. ex Link in Buch ssp. mandonii St.-Yves. We undertook a complete bibliographical revision of
the taxonomy, nomenclature, and chorology of F. jubata s.l., and contrasted it with morphological and anatomical
studies performed on samples from the Azores and Madeira. Azorean plants usually identified as F. jubata had a
character combination distinct from that of those with a Madeiran provenance. Saint-Yves’ proposal of two
independent taxa was correct, but he erroneously considered F. jubata as an Azorean endemic because the name
F. jubata was based on Madeiran plants. Consequently, F. jubata auct. pl. from the Azores belongs to a new
species
On the identity of Festuca jubata Lowe (Poaceae) and the description of a new Festuca species in the Azores Islands
The majority of authors consider Festuca jubata Lowe as an endemic species common to Madeira and the Azores.
Saint-Yves proposed that F. jubata was an Azorean endemic and described a geovicarious taxon in Madeira:
F. filiformis C. Sm. ex Link in Buch ssp. mandonii St.-Yves. We undertook a complete bibliographical revision of
the taxonomy, nomenclature, and chorology of F. jubata s.l., and contrasted it with morphological and anatomical
studies performed on samples from the Azores and Madeira. Azorean plants usually identified as F. jubata had a
character combination distinct from that of those with a Madeiran provenance. Saint-Yves’ proposal of two
independent taxa was correct, but he erroneously considered F. jubata as an Azorean endemic because the name
F. jubata was based on Madeiran plants. Consequently, F. jubata auct. pl. from the Azores belongs to a new
species
Produtos de hidratação em argamassas geopoliméricas à base de argila da Tunísia para reparação de estruturas de concreto
A reparação de estruturas degradadas de concreto representa uma oportunidade para a indústria da construção
mas também um desafio para a comunidade científica. O desenvolvimento de novas argamassas de reparação
constitui por isso uma importante área de investigação. Os geopolímeros são ligantes inovadores alternativos
ao cimento Portland pelo que as argamassas à base destes materiais, geopolíméricas, apresentam algumas
potencialidades no campo da reparação das estruturas de concreto.
O presente artigo apresenta resultados de uma investigação sobre o desenvolvimento de argamassas
geopoliméricas à base de uma argila da Tunísia sujeita a tratamento térmico. É incluída uma análise da argila
e também dos produtos de hidratação da argamassa os quais apresentam fases geopoliméricas típicas
- …