20 research outputs found
Stacking dependence of carrier transport properties in multilayered black phosphorous
We present the effect of different stacking orders on carrier transport
properties of multi-layer black phosphorous. We consider three different
stacking orders AAA, ABA and ACA, with increasing number of layers (from 2 to 6
layers). We employ a hierarchical approach in density functional theory (DFT),
with structural simulations performed with Generalized Gradient Approximation
(GGA) and the bandstructure, carrier effective masses and optical properties
evaluated with the Meta-Generalized Gradient Approximation (MGGA). The carrier
transmission in the various black phosphorous sheets was carried out with the
non-equilibrium Greens function (NEGF) approach. The results show that ACA
stacking has the highest electron and hole transmission probabilities. The
results show tunability for a wide range of band-gap, carrier effective masses
and transmission with a great promise for lattice engineering (stacking order
and layers) in black phosphorous.Comment: 18 Pages , 10 figure
Deep-water macroalgae from the Canary Islands: new records and biogeographical relationships
Due to the geographical location and paleobiogeography of the Canary Islands, the
seaweed flora contains macroalgae with different distributional patterns. In this contribution, the biogeographical relations of several new records of deep-water macroalgae recently collected around the Canarian archipelago are discussed. These are Bryopsidella neglecta (Berthotd) Rietema,Discosporangium mesarthrocarpum (Meneghini) Hauck, Hincksia onslowensis (Amsler et Kapraun)P.C. Silva, Syringoderma floridana Henry, Peyssonnelia harveyana J. Agardh, Cryptonemia seminervis(C. Agardh) J. Agardh, Botryodadia wynnei Ballantine, Gloiocladia blomquistii (Searles) R. E.Norris, PIahchrysis peltata (W. R. Taylor) P. Huv4 et H. Huv4, Leptofauchea brasiliensis Joly, and Sarcodiotheca divaricata W. R. Taylor. These new records, especially those in the Florideophyceae,support the strong affinity of the Canary Islands seaweed flora with the warm-temperate Mediterranean-Atlantic region. Some species are recorded for the first time from the east coast of the Atlantic Ocean, enhancing the biogeographic relations of the Canarian marine flora with that of the western Atlantic regions
Morfologia e reprodução de Chondria curvilineata F.S. Collins & Hervey (Rhodomelaceae, Rhodophyta), uma adição à flora brasileira Morphology and reproduction of Chondria curvilineata F.S. Collins & Hervey (Rhodomelaceae, Rhodophyta, an addition to the Brazilian marine flora
O trabalho a espĂ©cie Chondria curvilineata Ă© escrita pela primeira vez para o litoral brasileiro a. O material foi coletado no sublitoral da Lagoa da Conceição, FlorianĂłpolis, Santa Catarina. É apresentada uma descrição detalhada da morfologia e reprodução, discutindo e comparando as caracterĂsticas diagnĂłsticas da referida espĂ©cie com as demais espĂ©cies descritas para o Brasil e para outras partes do mundo.<br>Here the species Chondria curvilineata is described for the first time to the Brazilian coast. The material was collected in the subtidal region of Lagoa da Conceição, FlorianĂłpolis, Santa Catarina. We present a detailed description of the morphology and reproduction, discussing and comparing the diagnostic characteristic