221,918 research outputs found
Reversible Loss of Bernal Stacking during the Deformation of Few-Layer Graphene in Nanocomposites
No full textThe deformation of nanocomposites containing graphene flakes with different numbers of layers has been investigated with the use of Raman spectroscopy. It has been found that there is a shift of the 2D band to lower wavenumber and that the rate of band shift per unit strain tends to decrease as the number of graphene layers increases. It has been demonstrated that band broadening takes place during tensile deformation for mono- and bi-layer graphene but that band narrowing occurs when the number of graphene layers is more than two. It is also found that the characteristic asymmetric shape of the 2D Raman band for the graphene with three or more layers changes to a symmetrical shape above about 0.4% strain and that it reverts to an asymmetric shape on unloading. This change in Raman band shape and width has been interpreted as being due to a reversible loss of Bernal stacking in the few-layer graphene during deformation. It has been shown that the elastic strain energy released from the unloading of the inner graphene layers in the few-layer material (0.2 meV/atom) is similar to the accepted value of the stacking fault energies of graphite and few layer graphene. It is further shown that this loss of Bernal stacking can be accommodated by the formation of arrays of partial dislocations and stacking faults on the basal plane. The effect of the reversible loss of Bernal stacking upon the electronic structure of few-layer graphene and possibility of using it to modify the electronic structure of few-layer graphene is discussed
Bernal, M. N.
No full textM.N. Bernal sends an old coin minted in the time of Benito Juarez to General Alvaro Obregón as a wedding gift. Thanking response. / M. N. Bernal envía una moneda acuñada en los tiempos de Benito Juárez al Gral. Alvaro Obregón como regalo de bodas. Respuesta agradeciendo
Bernal, M. N.
No full textM.N. Bernal sends an old coin minted in the time of Benito Juarez to General Alvaro Obregón as a wedding gift. Thanking response. / M. N. Bernal envía una moneda acuñada en los tiempos de Benito Juárez al Gral. Alvaro Obregón como regalo de bodas. Respuesta agradeciendo
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Senator Joseph Bernal speaks to Kingsville delegation (photograph)
No full textSenator Joseph Bernal speaks to Kingsville delegation
Oral History Interview with Julio Cesar Bernal
No full textInterview with Julio Cesar Bernal about his life in North Carolina, his jouney from Colombia, and his work
Oral History Interview with Julio Cesar Bernal
No full textInterview with Julio Cesar Bernal about his life in North Carolina, his jouney from Colombia, and his work
Guía de estudio núm. 84. Reflejos de Bogotá, 1880-1930. Ricardo Acevedo Bernal, su pintura y su música
No full textEn sintonía con la exposición de la obra pictórica del pintor colombiano Ricardo Acevedo Bernal, esta guía de estudio se propone situar al público en el contexto cultural de la Bogotá del periodo 1880-1930. Aquí se lee el papel y carácter de sus pinturas y música en un momento en el que se ve a la sociedad bogotana, conservadora y religiosa, intentando abrirse paso hacia otras significaciones de la identidad nacional. La referencia a dos obras pertenecientes a la Colección de Arte del Banco de la República ejemplifican el entorno particular en el que se inscribió su vida y obra.
Incluye imágenes de seis obras
Errina argentina Bernal, Cairns, & Lauretta 2018
No full textErrina argentina Bernal, Cairns & Lauretta, 2018 in Bernal et al. 2019 Distribution. Mar del Plata Submarine Canyon and adjacent area, 1398 m depth. Material examined. MACN-In 41480 (holotype) off Mar del Plata, Argentina, St. 59 (37º 49.688’ S, 54º 5.236’ W), 1398 m, September 2013; MACN-In 40652 off Mar del Plata, Argentina, St. 59 (37º 49.688’ S, 54º 5.236’ W), 1398 m, September 2013. Description. See Bernal et al. 2019 Discussion. Hitherto there are only two species (and possibly a third species, should Errina sp. be confirmed as a new one) of this genus described from off Argentina: E. antarctica (Gray, 1872) and E. argentina. There are probably more species of Errina to be discovered in the study area, considering there are several stylasterid species in common between SWA off Argentina and the circumantarctic zone (see Discussion section).Published as part of Bernal, M. C., Cairns, S. D., Penchaszadeh, P. E. & Lauretta, D., 2021, Stylasterids (Hydrozoa: Stylasteridae) from Mar del Plata submarine canyon and adjacent area (southwestern Atlantic), with a key to the species off Argentina, pp. 401-452 in Zootaxa 4969 (3) on page 17, DOI: 10.11646/zootaxa.4969.3.1, http://zenodo.org/record/475125
Micropygomyia (Coquillettimyia) nahua Ibanez-Bernal, Garcia-Torres & Vasquez-Marquez 2017
No full text<i>Micropygomyia</i> (<i>Coquillettimyia</i>) <i>nahua</i> Ibáñez-Bernal, García-Torres & Vásquez-Márquez, 2017 <p> <i>nahua</i> Ibáñez-Bernal, García-Torres & Vásquez-Márquez, 2017: 169 (as <i>Micropygomyia</i> (<i>Coquillettimyia</i>)). Type locality: Mexico, Veracruz, municipality of Naolinco, Tenampa-Chivería (about 10 km south of Naolinco city by road; 19°36’42.10” N 96°51’39.96” W, 900 m asl). Galati (2021, classification, keys)</p> <p> <b>General distribution.</b> Mexico (Ibáñez-Bernal <i>et al</i>. 2017).</p> <p> <b>Distribution in Mexico.</b> Veracruz (only the type locality) (Ibáñez-Bernal <i>et al</i>. 2017).</p>Published as part of <i>Ibáñez-Bernal, Sergio & Durán-Luz, Juana, 2022, An actualized catalogue of the Psychodidae (Diptera) of Mexico and their known distribution by state, pp. 347-408 in Zootaxa 5104 (3)</i> on page 370, DOI: 10.11646/zootaxa.5104.3.2, <a href="http://zenodo.org/record/6332122">http://zenodo.org/record/6332122</a>
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A letter from Jesse Bernal to Dr. Hector P. Garcia.
No full textA letter from Jesse Bernal, Education Legislative Aide for the Texas House of Representatives Mexican American Legislative Caucus, to Dr. Hector P. Garcia, regarding his recent trip and a copy of articles discussing the trip
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