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Search Results: 1 - 10 of 170 matches for " Monserrat "
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Kinetic Monte Carlo model of epitaxial graphene growth
B. Monserrat
Physics , 2012,
Abstract: In this thesis we present a kinetic Monte Carlo model for the description of epitaxial graphene growth. Experimental results suggest a growth mechanism by which clusters of 5 carbon atoms are an intermediate species necessary for nucleation and island growth. This model is proposed by experimentally studying the velocity of growth of islands which is a highly nonlinear function of adatom concentration. In our simulation we incorporate this intermediate species and show that it can explain all other experimental observations: the temperature dependence of the adatom nucleation density, the equilibrium adatom density and the temperature dependence of the equilibrium island density. All these processes are described only by the kinematics of the system.
Vibrational averages along thermal lines
Bartomeu Monserrat
Physics , 2015,
Abstract: A method is proposed for the calculation of vibrational quantum and thermal expectation values of physical properties from first principles. Thermal lines are introduced: these are lines in configuration space parametrized by temperature, such that the value of any physical property along them is approximately equal to the vibrational average of that property. The number of sampling points needed to explore the vibrational phase space is reduced by up to an order of magnitude when the full vibrational density is replaced by thermal lines. Calculations of the vibrational averages of several properties and systems are reported, namely the internal energy and the electronic band gap of diamond and silicon, and the chemical shielding tensor of L-alanine. Thermal lines pave the way for complex calculations of vibrational averages, including large systems and methods beyond semi-local density functional theory.
Fibers of pencils of curves on smooth surfaces
Francisco Monserrat
Mathematics , 2006,
Abstract: Let $X$ be a smooth projective surface such that linear and numerical equivalence of divisors on $X$ coincide and let $\sigma\subseteq |D|$ be a linear pencil on $X$ with integral general fibers. A fiber of $\sigma$ will be called special if either it is not integral or it has non-generic multiplicity at some of the base points (including the infinitely near ones) of the pencil. In this note we provide an algorithm to compute the integral components of the special fibers of $\sigma$.
Lins Neto's examples of foliations and the Mori cone of blow-ups of $P^2$
Francisco Monserrat
Mathematics , 2009, DOI: 10.1112/blms/bdq111
Abstract: We use a family of algebraic foliations given by A. Lins Neto to provide new evidences to a conjecture, related to the Harbourne-Hirschowitz's one and implying the Nagata's conjecture, which concerns the structure of the Mori cone of blow-ups of $\mathbb{P}^2$ at very general points.
Curves having one place at infinity and linear systems on rational surfaces
F. Monserrat
Mathematics , 2006,
Abstract: Denoting by ${\mathcal L}_d(m_0,m_1,...,m_r)$ the linear system of plane curves passing through $r+1$ generic points $p_0,p_1,...,p_r$ of the projective plane with multiplicity $m_i$ (or larger) at each $p_i$, we prove the Harbourne-Hirschowitz Conjecture for linear systems ${\mathcal L}_d(m_0,m_1,...,m_r)$ determined by a wide family of systems of multiplicities $\bold{m}=(m_i)_{i=0}^r$ and arbitrary degree $d$. Moreover, we provide an algorithm for computing a bound of the regularity of an arbitrary system $\bold{m}$ and we give its exact value when $\bold{m}$ is in the above family. To do that, we prove an $H^1$-vanishing theorem for line bundles on surfaces associated with some pencils ``at infinity''.
Globaliza??o, interesse público e direito internacional
Monserrat Filho, José;
Estudos Avan?ados , 1995, DOI: 10.1590/S0103-40141995000300006
Abstract: the current economic globalization process that overtakes the world benefits mostly the private interests which are also its main propulsion force. a need for the development and consolidation of the concept of international public interest will certainly emerge from such a process. this concept of international public interest should constitute a reference and criteria for the establishment of international rules that would assure the survival and the evolution of the human species on this planet as a counterpart to the economic globalization's most unreasonable and perverse tendencies. the concept of international public interest had its first outlines in the beginning of this century within the international public law. it has been referred to more and more as the idea of humankind becomes essential to express the more universal interests to be defended for the sake of peace, security and progress for all the people on earth.
SOBRE LA ESCRITURA DE LA FILOSOFíA
Monserrat-Molas,Josep;
Alpha (Osorno) , 2010, DOI: 10.4067/S0718-22012010000200004
Abstract: the education of a reader through a piece of writing can take place in an environment of persecution or in one of freedom. thus, the piece of writing may become exoteric, protreptic or elusive. associative reading demands application and attention. reading is an art exerted on language and thought. several examples of reading comprehension becoming a fruitful philosophical action are analysed.
Nuevos datos sobre algunas especies de hemeróbidos (Insecta, Neuroptera, Hemerobiidae)
Monserrat, V. J.
Graellsia , 2008,
Abstract: New data on the distribution, biology, phaenology, wing or genital morphology, variability, nomenclature and/or taxonomy of 67 brown-lacewings species from Palaearctic, Nearctic, Holarctic, Afrotropical, Oriental, Australian and Neotropical Faunas are given. New data about some species not recorded since the original description are given, and the previously known geographical distribution of some species is significantly enlarged. New data on the wing pigmentation and morphology of Hemerobius cercodes Navás, 1917, Sympherobius distinctus Carpenter, 1940, S. similis Carpenter, 1940 and S. limbus Carpenter, 1940 are given, and data on the external male genitalia of Sympherobius limbus Carpenter, 1940, S. similis Carpenter, 1940, S. arizonicus Banks, 1911, S. perparvus (McLachlan, 1869), S. occidentalis (Fitch, 1855) and S. angustus (Banks, 1904) are figured. Neotypes for Sympherobius pupillus Navás, 1915 and for Hemerobius cercodes Navás, 1917 are proposed, and two new synonymies: Sympherobius angustus (Banks, 1904) = S. pupillus Navás, 1915 n. sin. and Hemerobius cercodes Navás, 1917 = H. subacutus (Nakahara, 1966) n. sin. are proposed. On the basis of the high variability and overlapping found in several external and genital characters that define some Nearctic species / populations of the Sympherobius angustus (Banks, 1904) species group, some species of this species group are questionable. A new species, Notiobiella jaimei n. sp. is described from Vietnam. Se anotan nuevos datos sobre la distribución, biología, fenología, morfología alar o genital, variabilidad, nomenclatura y / o taxonomía de 67 especies de hemeróbidos de las Faunas Paleártica, Neártica, Afrotropical, Oriental, Australiana y Neotropical. Alguna de ellas no había sido citada desde su descripción original y de otras se amplía significativamente su distribución. Se anotan nuevos datos sobre la morfología y pigmentación de las alas de Hemerobius cercodes Navás, 1917, Sympherobius distinctus Carpenter, 1940, S. similis Carpenter, 1940 y S. limbus Carpenter, 1940 y sobre la genitalia externa masculina de Sympherobius limbus Carpenter, 1940, S. similis Carpenter, 1940, S. arizonicus Banks, 1911, S. perparvus (McLachlan, 1869), S. occidentalis (Fitch, 1855) y S. angustus (Banks, 1904). Se propone la creación de un neotipo para Sympherobius pupillus Navás, 1915 y para Hemerobius cercodes Navás, 1917 y son propuestas dos nuevas sinonimias: Sympherobius angustus (Banks, 1904) = S. pupillus Navás, 1915 n. sin. y Hemerobius cercodes Navás, 1917 = H. subacutus (Nakahara, 1966) n. sin. En base a l
New taxonomic and faunistic data on the dusty wings from Senegal (Insecta, Neuroptera, Coniopterygidae)
Monserrat, V. J.
Graellsia , 2006,
Abstract: New data on the taxonomy, biology, distribution and/or morphology of eight dusty wing species from Senegal are given. None had previously been recorded from this country. In this African area (where the Afrotropical and Palaearctic Biogeographical Regions contact) a great number of species can be found, mostly afrotropical elements, but also some palaearctic elements and species with a wide circumsaharan distribution are present. A great faunistic similarity between the Senegalese Fauna and the SW Arabian Peninsula fauna is noted, and both areas show many common elements present in the East-West Afrotropical northern borders. Some new synonymies are proposed as follow: Aleuropteryx felix Meinander, 1977 = (Aleuropteryx teleki Sziráki, 1990 = Aleuropteryx transvaalensis Meinander, 1998), Aleuropteryx Arabica Meinander, 1977 = (Aleuropteryx cruciata Sziráki, 1990), Coniocompsa silvestriana Enderlein, 1914 = (Coniocompsa arabica Sziráki, 1992 = Coniocompsa fimbrata Tjeder, 1957), Coniopteryx (Coniopteryx) greenpeace Monserrat, 1995 = (Coniopteryx (Coniopteryx) sclerotica Meinander, 1998), Coniopteryx (Xeroconiopteryx) triantennata Monserrat, 1995 = (Coniopteryx (Xeroconiopteryx) sestertia Meinander, 1998) and Nimboa marroquina Monserrat, 1985 = (Nimboa manselli Meinander, 1998). Also a replacement name: Coniopteryx (Xeroconiopteryx) conviventibus nom. nov. is proposed for Coniopteryx (Xeroconiopteryx) furcata Meinander, 1998 nec Coniopteryx (Scotoconiopteryx) furcata Meinander, 1983. Se anotan nuevos datos sobre la taxonomía, biología, distribución y /o morfología de ocho especies de coniopterígidos recolectados en Senegal. Ninguna de ellas había sido citada en este país. Al igual que ocurre en el SO de la Península Arábiga, esta zona del Continente Africano (donde confluyen las Regiones Biogeográficas Afrotropical y Paleártica) es especialmente rica en especies, la mayoría son afrotropicales, pero también están presentes algunos elementos paleárticos y otros de amplia distribución circumsahariana. Se anota una marcada similitud faunística entre ambas zonas con elementos comunes que alcanzan las zonas septentrionales que al este y el oeste limitan la Región Afrotropical. Se proponen como nuevas sinonimias a: Aleuropteryx felix Meinander, 1977 = (Aleuropteryx teleki Sziráki, 1990 = Aleuropteryx transvaalensis Meinander, 1998), Aleuropteryx arabica Meinander, 1977 = (Aleuropteryx cruciata Sziráki, 1990), Coniocompsa silvestriana Enderlein, 1914 = (Coniocompsa arabica Sziráki, 1992 = Coniocompsa fimbrata Tjeder, 1957), Coniopteryx (Coniopteryx) greenpeace Mon
Contribución al conocimiento de los hemeróbidos de Patagonia y Tierra del Fuego (Insecta, Neuroptera, Hemerobiidae)
Monserrat, Víctor J.
Graellsia , 2003,
Abstract: New data on the biology and distribution of 10 species of brown-lacewings collected in 48 localities of Patagonia and Tierra del Fuego are given. Larvae of Hemerobius bolivari Banks, 1910, Hemerobius chilensis Nakahara, 1965, Hemerobius stenopterus Monserrat, 1996, Sympherobius gayi Navás, 1910, Nomerobius cuspidatus Oswald, 1990 and Gayomyia falcata (Blanchard in Gay, 1851) are described. Larval stages of genera Nomerobius and Gayomyia are described for the first time. Se aportan nuevos datos sobre la biología y distribución de 10 especies de hemeróbidos capturadas en 48 localidades de Patagonia y Tierra del Fuego. Se describen las larvas de Hemerobius bolivari Banks, 1910, Hemerobius chilensis Nakahara, 1965, Hemerobius stenopterus Monserrat, 1996, Sympherobius gayi Navás, 1910, Nomerobius cuspidatus Oswald, 1990 y Gayomyia falcata (Blanchard en Gay, 1851). Los estadios larvarios en los géneros Nomerobius y Gayomyia eran desconocidos hasta ahora.
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