543 research outputs found
On the elastic tensors of ultra-thin films: A study of ruthenium
No full textThe resources and services used in this work were partly provided by the VSC (Flemish Supercomputer Center) , funded by the Research Foundation-Flanders (FWO) , Belgium and the Flemish Government, Belgium. The various members of our group for discussions and aid over the course of this research
Computing elastic tensors of amorphous materials from first-principles
No full textThe resources and services used in this work were partly provided by the VSC (Flemish Supercomputer Center) , funded by the Research Foundation-Flanders (FWO) and the Flemish Government. The various members of our group for discussions and aid over the course of this research
Photoemission spectroscopy on photoresist materials: A protocol for analysis of radiation sensitive materials
No full textWe would like to express our sincere gratitude to Paul van der Heide and John Petersen for their kind support. K.M.D and D.P.S. acknowledge funding from the European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant Agreement No.s 101031245 (K.M.D.) and 101032241 (D.P.S.)
Annickia letestui Setten & Maas, Taxon 39 (4): 676 1990
No full textAnnickia letestui (Le Thomas) Setten & Maas, Taxon 39(4): 676, 1990 Fig. 6; Map 1D ≡ Enantia letestui Le Thomas, Adansonia sér. 2, 2: 306, 1962. Type. Gabon. Ogooué-Lolo, Ikembélé, Le Testu G.M.P.C. 8432, Oct 1930: lectotype, here designated: P[P00267987]; isolectotypes: BM[BM000547036]; BR[BR0000006418700]; P[P00362651, P02005895, P02005896]. Description. Tree, 2-8 m tall, d.b.h. unknown; stilt roots or buttresses absent, slash yellow. Indumentum of simple, bifid, fasciculate or stellate hairs; old leafless branches glabrous, young foliate branches tomentose. Leaves: petiole 3-8 mm long, 1-2 mm in diameter, tomentose to sparsely pubescent, cylindrical, blade inserted on top of the petiole; blade 10-29.5 cm long, 3.5-10.5 cm wide, elliptic to obovate, apex acuminate to mucronate, acumen 1-2 cm long, base cuneate to rounded to acuminate, subcoriaceous, above glabrous when young and old, below pubescent when young and old, hairs simple, bifid and stellate pointing in all directions, concolorous; midrib sunken or flat, above glabrous when young and old, below pubescent when young and old; secondary veins 9 to 13 pairs, glabrous below; tertiary venation intermediate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, leaf opposed or extra axillary. Flowers with 6 perianth parts in 2 whorls, 1 per inflorescence; pedicel 4-14 mm long, ca. 2 mm in diameter, sparsely pubescent; in fruit ca. 10 mm long, ca. 2 mm in diameter, pubescent; bracts 2, one basal and one upper towards the lower half of pedicel, basal bract 2-4 mm long, 2-3 mm wide; sepals 3, valvate, free, 5-9 mm long, 3-4 mm wide, triangular, apex acute, base truncate, pubescent outside, glabrous inside, margins flat; petals free; outer petals absent; inner petals 3, valvate, 12-26 mm long, 7-12 mm wide, ovate to inversely Y-shaped ridged, apex acute, base broad and concave, yellow-green, margins flat, pubescent outside, pubescent towards margins inside; stamens 60 to 125, in 5 to 6 rows, ca. 2 mm long, linear; connective flattened, glabrous; staminodes absent; carpels free, 20 to 35, ovary ca. 3 mm long, stigma lobed, pubescent. Monocarps stipitate, stipes 8-19 mm long, ca. 1 mm in diameter; monocarps 8 to 20, 19-25 mm long, 10-14 mm in diameter, ellipsoid, apex mucronate, glabrous, smooth, glossy, green turning red to black when ripe; seeds ca. 20 mm long, ca. 10 mm in diameter, ellipsoid; aril absent. Distribution. From Cameroon to Gabon, and one collection in northern Republic of Congo; in Cameroon known from the South region. Habitat. A rare species; in lowland rain forests, mainly in primary habitats. Altitude 300-700 m a.s.l. Local and common names known in Cameroon. M’Fo, Mofo, Mpuley (dial. Mab Kwasio, van Andel 4216); N’jie (Dials. Duala, Punu, Bos 4962). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019c). Uses in Cameroon. None recorded. Notes. Annickia letestui is characterized by having tomentose young foliate branches and petioles, the lower side of the leaf blades are pubescent with appressed or erect hairs that are simple, bifid, fasciculate or stellate, pointing in all directions. Versteegh and Sosef (2007) note that the indumentum is quite variable within this species, even within individuals, varying from short and appressed to erect and longer hairs. Vernacular names are likely to apply to other species of the genus. Specimens examined. South Region: 15 km from Kribi Lolodorf road, 3.00°N, 10.02°E, 01 July 1969, Bos J.J. 4962 (MO,WAG); Mendoum, 2.22°N, 11.23°E, 13 February 1965, Raynal J. 13392 (P); Campo-Ma’an area Bifa, 2.67°N, 10.28°E, 13 October 2001, Tchouto Mbatchou G.P. BIFAX_150 (WAG); Campo-Ma’an area 2.73°N, 9.873°E, 16 August 2001, van Andel T.R. 3882 (WAG); Campo-Ma’an area near Boussebeliga creek bridge, 2.37°N, 9.822°E, 26 October 2001, van Andel T.R. 4216 (WAG).Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 36-38, DOI: 10.3897/phytokeys.207.6143
Combination of ab initio descriptors and machine learning approach for the prediction of the plasticity mechanisms in β-metastable Ti alloys
No full textThis study proposes a machine-learning (ML) model combining ab initio calculations and an experimental dataset of 201 alloys (in addition to pure Ti) to predict the activated plasticity mechanisms in β-Ti alloys. This meth- odology is shown to be more efficient than the so-called Bo Md approach, achieving 82% prediction accuracy while the Bo-Md approach leads to 52% correct predictions on the same dataset. In addition, four new alloy compositions were produced to verify the model validity. Specific cases where the present model disagreed with the Bo-Md predictions were chosen to increase the benefits of the produced results. The plasticity mechanisms of the four alloys experimentally confirmed the validity of the ML model. This approach particularly helps the design of specific Ti alloys exhibiting a high work hardening rate owing to the simultaneous activations of the Transformation-Induced Plasticity (TRIP) and mechanical twinning (TWIP) effects. Indeed, the class corre- sponding to the combination of TRIP and TWIP effects reach a prediction accuracy of 88%
On the enthalpy of formation of aluminum diboride, AlB2
No full textIn this letter we address the discrepancy in the literature concerning the enthalpy of formation of AlB2 by means of density functional calculations. The literature values vary from 23 to 151 kJ/mol. Our calculated value of 16 kJ/mol clearly favors the lower value with which it is in agreement within the expected accuracy of DFT
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