Determination of the most suitable oil pipeline route using GIS least cost path analysis

The Keystone XL has a big role for transforming Canadian oil to the USA. The function of the pipeline is decreasing the dependency of the American oil industry on other countries and it will help to limit external debt. The proposed pipeline seeks the most suitable route which cannot damage agricultural and natural water recourses such as the Ogallala Aquifer. Using the Geographic Information System (GIS) techniques, the suggested path in this study got extremely high correct results that will help in the future to use the least cost analysis for similar studies. The route analysis contains different weighted overlay surfaces, each, was influenced by various criteria (slope, geology, population and land use). The resulted least cost path routes for each weighted overlay surface were compared with the original proposed pipeline and each displayed surface was more effective than the proposed Keystone XL pipeline.

L’opinion publique canadienne sur les changements climatiques et les politiques de contrôle des émissions de gaz à effet de serre

Notes d'analyse de la Chaire d’études politiques et économiques américaines

Cytochrome p450 1b1, a new keystone in gene-environment interactions related to human head and neck cancer?

Alcohol consumption and tobacco smoking are major causes of head and neck cancers, and regional differences point to the importance of research into gene-environment interactions. Much interest has been focused on polymorphisms of CYP1A1 and of GSTM1 and GSTT1, but a number of studies have not demonstrated significant effects. This has mostly been ascribed to small sample sizes. In general, the impact of polymorphisms of metabolic enzymes appears inconsistent, with some reports of weak-to-moderate associations, and with others of no elevation of risks. The classical cytochrome P450 isoenzyme considered for metabolic activation of polycyclic aromatic hydrocarbons (PAH) is CYP1A1. A new member of the CYP1 family, CYP1B1, was cloned in 1994, currently representing the only member of the CYP1B subfamily. A number of single nucleotide polymorphisms of the CYP1B1 gene have been reported. The amino acid substitutions Val432Leu (CYP1B1*3) and Asn453Ser (CYP1B1*4), located in the heme binding domain of CYP1B1, appear as likely candidates to be linked with biological effects. CYP1B1 activates a wide range of PAH, aromatic and heterocyclic amines. Very recently, the CYP1B1 codon 432 polymorphism (CYP1B1*3) has been identified as a susceptibility factor in smoking-related head-and-neck squamous cell cancer. The impact of this polymorphic variant of CYP1B1 on cancer risk was also reflected by an association with the frequency of somatic mutations of the p53 gene. Combined genotype analysis of CYP1B1 and the glutathione transferases GSTM1 or GSTT1 has pointed to interactive effects. This provides new molecular evidence that tobacco smoke-specific compounds relevant to head and neck carcinogenesis are metabolically activated through CYP1B1 and is consistent with a major pathogenetic relevance of PAH as ingredients of tobacco smoke.

Studies in sesquiterpenes-XL. Isolongifolene (part 1): Structure

Isolongifolene, C15H24 an artefact from an acid-catalysed rearrangement of longifolene, is shown to be II.

Keystone food resources for honey bees in South Indian west coast during monsoon

The low level, denuded, laterite landscape of coastal Uttara Kannada has a rich diversity of monsoon herbs, including threatened and newly discovered ones. Our study reveals that honey bees congregate on the ephemeral herb community of Utricularias, Eriocaulons and Impatiens during their gregarious monsoon flowering period. Apis dorsata had highest visitations on Utricularias, Impatiens and Flacourtia indica, whereas Trigona preferred Eriocaulons. Laterite herb flora merits conservation efforts as a keystone food resource for the insect community, especially for honey bees.

Sapientia, 1985, Vol. XL, nº 158 (número completo)

Contenido: La verdad (IV). El significado y la trascendencia de la verdad para el perfeccionamiento humano / Octavio N. Derisi -- El entender como perfección : la operación inmanente / J. L. González Alió -- Conocimiento y causalidad / Mario E. Sacchi -- Notas y comentarios -- Bibliografía

Sapientia, 1985, Vol. XL, nº 157 (número completo)

Contenido: La verdad (III). La verdad en Dios / Octavio N. Derisi -- La filosofía frente a la física moderna / Octavio N. Derisi -- El progreso de la física actual y la ética cristiana / Alberto Caturelli -- ¿Ciencia o actividad política en la docencia? / William R. Darós -- La racionalización del mundo en el pensamiento de Aristóteles -- Notas y comentarios -- Bibliografía

Sapientia, 1985, Vol. XL, nº 156 (número completo)

Contenido: La verdad (II). La verdad en la inteligencia humana / Octavio N. Derisi -- Notas sobre la fundamentación de la ética aristotélica / Beatriz Bossi de Kirchner -- Juicios morales y verdad / María C. Donadío Maggi de Gandolfi -- Algunos aspectos de la doctrina tomista del entendimiento posible / María L. Lukac de Stier -- El racionalismo en el inicio del inmanentismo jurídico / Guillermo J. Yacobucci -- Notas y comentarios -- Bibliografía

Teología, 2001, Tomo XL nº 077 (número completo)

Libros, bibliotecas, control de lecturas e imprentas rioplatenses en los siglos XVI al XVIII / Ernesto J. A. Maeder -- Archivos para la historia de la Iglesia en la Argentina / Ana María Martínez de Sánchez -- Itinerario espiritual y teología de los estados. En diálogo con K. Rahner y H. U. von Balthasar / Virginia Raquel Azcuy -- La dimensión existencial de la esperanza en un poema de Charles Péguy / Cecilia Inés Avenatti de Palumbo -- Tiempo e historia: un aporte bibliográfico al diálogo interdisciplinario / Francisco García Bazán -- Notas bibliográficas

Teología, 2003, Tomo XL nº 081 (número completo)

La Biblia y la literatura: Génesis y desarrollo de un encuentro / Luis H. Rivas -- Algo más sobre la Novo Millenio Ineunte: el cristianismo como revelación moral / Eduardo Briancesco -- Espacio teodramático y forma vital: Dos aportes hidelgardianos a la estética medieval / Cecilia I. Avenatti de Palumbo -- Cuestiones emergentes en torno al monoteísmo / Marcelo González -- Amor, virtud y corrección / Gustavo Irrazábal -- “Cultura” e “inculturación” en Juan Pablo II / Gerardo D. Ramos -- Diocleciano y la teología tetrárquica / María Pollitzer -- Notas bibliográficas -- Libros recibidos -- Instrucciones para los colaboradores

Sapientia, 1985, Vol. XL, nº 155 (número completo)

Contenido: La verdad (I). La verdad en sí misma y en las cosas / Octavio N. Derisi -- Carácter racional de la libertad / Octavio N. Derisi -- Libertad política : liberalismo y tomismo / Héctor H. Hernández -- Hilemorfismo y corporalidad / J. E. Bolzán -- Fenomenología de la sensación / Gabriel Chalmeta -- La teoría relacional de la personalidad según J. Nuttin / William R. Darós -- Notas y comentarios -- Bibliografía

Teología, 2003, Tomo XL nº 082 (número completo)

Nota del Director. Novedades del 2004 -- Lo objetivo y lo subjetivo de la redención cristiana. Síntesis histórica y perspectiva actual / Leonardo Capelluti -- En torno a la beatificación de Isabel la Católica. Amor a la Iglesia. Pobreza / Melquíades Andrés Martín -- Razón teológica y tutela del embrión humano / Alejandro C. Llorente -- Religión y Ciencia en el pensamiento de Juan Pablo II: importancia y responsabilidad del diálogo para una cultura verdaderamente humana / Jorge Papanicolau -- La Iglesia en Buenos Aires durante la epidemia de fiebre amarilla de 1871 según el Diario de la epidemia Mardoqueo Navarro / Jorge Ignacio García Cuerva -- Ars artium: vigencia de la lógica clásica / Oscar H. Beltrán -- Crónica de la Facultad 2003

Influence of In0.2Ga0.8As strain-reducing layer on the active region of quantum dot superluminescent diodes

We have investigated the optical properties of asymmetric multiple layer stacked self-assembled InAs quantum dot with different interlayer. We found that asymmetric multiple stacked QD samples with In0.2Ga0.8As + GaAs interlayer can afford a 180nm flat spectral width with strong PL intensity compared to other samples at room temperature. We think this result is due to the introduction of In0.2Ga0.8As strain-reducing layer. Additionally, for the broad spectral width and the strong PL intensity, this structure can be a promising candidate for quantum-dot superluminescent diodes.

High-mobility Ga-polarity GaN achieved by NH3-MBE

GaN epilayers were grown on (0001) sapphire substrates by NH3-MBE and RF-MBE (radio frequency plasma). The polarities of the epilayers were investigated by in-situ RHEED, chemical solution etching and AFM surface examination. By using a RF-MBE grown GaN layer as template to deposit GaN epilayer by NH3-MBE method, we found that not only Ga-polarity GaN films were repeatedly obtained, but also the electron mobility of these Ga-polarity films was significantly improved with a best value of 290 cm(2)/V.s at room temperature. Experimental results show it is an easy and stable way for growth of high quality Ga-polarity GaN films.

Twin and grain boundary in InP: A synchrotron radiation study

Experimentally observed X-ray reflectivity curves show bi-crystal(twin) characteristics. The study revealed that there was defect segregation at the twin boundary. Stress was relaxed at the edge of the boundary. Relaxation of the stress resulted in formation of twin and other defects. As a result of formation of such defects, a defect-free and stress-free zone or low defect density and small stress zone is created around the defects. So a twin model was proposed to explain the experimental results. Stress(mainly thermal stress), chemical stoichiometry deviation and impurities nonhomogeneous distributions are the key factors that cause twins in LEC InP crystal growth. Twins on (111) face in LEC InP crystal were studied. Experimental evidence of above mentioned twin model and suggestions on how to get twin-free LEC InP single crystals will be discussed.