L'Écho de Paris

1908/12/15 (Numéro 8900).

Herramienta. Convierte tu idea en una oportunidad empresarial 2

Desarrollo empresarial y creación de empresa

Receipt from James Mills, St. Catharines for creams and potions

Receipt from James Mills, St. Catharines for creams and potions, Mar. 1, 1888.

Voyage en Russie

UANL

La chronique politique de la presse écrite montréalaise : portrait d’un genre journalistique en quête d’une définition

La chronique politique, qui se trouve au coeur de la question de l’influence de la presse sur l’opinion publique, rencontre un vide dans les écrits scientifiques, du moins au Québec. L’étude de la chronique est pourtant des plus pertinentes dans le contexte actuel où les plateformes Web viennent renforcer la présence de commentateurs de tous les sujets. À partir d’une analyse systématique de chroniques politiques parues entre 1991 et 2011, ainsi que d’entrevues semi-dirigées avec des chroniqueurs politiques chevronnés, la présente étude décrit ce genre jusqu’ici peu étudié. Ainsi, les caractéristiques tels le format et la disposition de la chronique sont d’une part mises en évidence, alors que la diversité de sujets traités par les chroniqueurs politiques, d’autre part, montre que le genre jouit d’une grande liberté et que les auteurs peuvent choisir à propos de quoi ils veulent écrire et la manière de le faire. La critique négative reste omniprésente dans les chroniques, mais dans une moins grande proportion que ce à quoi il aurait été possible de s’attendre, plusieurs étant plutôt neutres et de nature explicative. Finalement, les propos des chroniqueurs prouvent que cette fonction s’accompagne d’une reconnaissance et d’un certain vedettariat, autant parmi la population qu’auprès de leurs collègues. Le tout permet de distinguer la chronique de l’ensemble des autres genres et pratiques journalistiques.

Análisis ecocardiográfico de la función sistólica del ventrículo izquierdo por médicos no cardiólogos con un dispositivo de bolsillo

Se realizó un estudio transversal, se incluyeron 3 residentes no cardiólogos y se les dio formación básica en ecocardiografía (horas teóricas 22, horas prácticas 65), con recomendaciones de la Sociedad Americana de Ecocardiografia y aportes del aprendizaje basado en problemas, con el desarrollo de competencia técnicas y diagnósticas necesarias, se realizó el análisis de concordancia entre residentes y ecocardiografistas expertos, se recolectaron 122 pacientes hospitalizados que cumplieran con los criterios de inclusión y exclusión, se les realizo un ecocardiograma convencional por el experto y una valoración ecocardiográfica por el residente, se evaluó la ventana acústica, contractilidad, función del ventrículo izquierdo y derrame pericárdico. La hipótesis planteada fue obtener una concordancia moderada. Resultados: Se analizó la concordancia entre observadores para la contractilidad miocárdica (Kappa: 0,57 p=0,000), función sistólica del ventrículo izquierdo (Kappa 0,54 p=0.000) siendo esta moderada por estar entre 0,40 – 0,60 y con una alta significancia estadística, para la calidad de la ventana acústica (Kappa: 0,22 p= 0.000) y presencia de derrame pericárdico (Kappa: 0,26 p= 0.000) se encontró una escasa concordancia ubicándose entre 0,20 – 0,40. Se estableció una sensibilidad de 90%, especificidad de 67%, un valor predictivo positivo de 80% y un valor predictivo negativo de 85% para el diagnóstico de disfunción sistólica del ventrículo izquierdo realizado por los residentes.

Entorn informàtic per contribuir al desenvolupament de l'autonomia i la competència estratègica en l'aprenentatge de l'alemany a l'educació secundària. 'Entorno informático para contribuir al desarrollo de la autonomía y la competencia estratégica en el aprendizaje del alemán en la educación secundaria'.

Resumen basado en el de la autora . El material se encuentra en: http://webct.xtec.es:8900/SCRIPT/klick/scripts/serve_home

Synthesis, Spectroscopic Studies and X-ray Crystal Structures of New Pyrazoline and Pyrazole Derivatives

The synthesis and characterization of some pyrazoline compounds of 1,3-diketones with hydrazine derivatives, namely, 1-(S-benzyldithiocarbazate)-3-methyl-5-phenyl-5-hydroxypyrazoline (1); 1-(2-thiophenecarboxylic)-3-methyl-5-phenyl-5-hydroxypyrazoline (2); 1-(2-thiophenecarboxylic)-3,5-dimethyl-5-hydroxypyrazoline (3); 1-(S-benzyldithiocarbazato)-3-methyl-5-phenylpyrazole (4); 1-(2-thiophenecarboxylic)-3-methyl-5-phenylpyrazole (5) and 1-(S-benzyldithiocarbazate)-3,5-dimethylpyrazole (6) are reported. Studies by IR, ((1)H, (13)C)-NMR spectroscopies and single crystal X-ray diffraction revealed that compounds (1)(,) (2) and (3) are formed as pyrazoline, whereas (4) and (5) are formed as pyrazole derivatives only under acidic conditions. Compound (1) crystallizes in orthorhombic P2(1)2(1)2(1), a = 6.38960(10) angstrom, b = 12.9176(3) angstrom, c = 21.2552(5) angstrom, (2) crystallizes in monoclinic, P2(1)/n, a = 11.3617(2) angstrom, b = 8.4988(2) angstrom, c = 92.8900(10)angstrom and beta = 92.8900(5)degrees, (3) crystallizes in monoclinic, C2/c, a = 15.9500(5) angstrom, b = 9.3766(3) angstrom, c = 16.6910(5)angstrom and beta = 113.825(2)degrees, (4) crystallizes in monoclinic, P2(1)/c, a = 15.228(4) angstrom, b = 5.5714(13) angstrom, c = 19.956(5)angstrom and beta = 91.575(7)degrees and (6) crystallizes in orthorhombic, P2(1)2(1)2(1), a = 5.3920(2) angstrom, b = 11.2074(5) angstrom, c = 21.885(1)angstrom . The (3) derivative represents the first pyrazoline compound prepared from 2,4-pentanedione and characterized crystallographically.

Gestão do conhecimento em ambientes de teletrabalho

O presente estudo buscou verificar se há diferenças significativas na utilização de práticas e ferramentas voltadas à gestão do conhecimento, na opinião de trabalhadores presenciais e de teletrabalhadores. Para tanto, este estudo descritivo-quantitativo aplicou um questionário a 319 colaboradores, sendo 180 trabalhadores presenciais e 139 teletrabalhadores, todos atuantes em quinze empresas de porte médio ou grande da indústria de software no Brasil. Os resultados encontrados indicam que os teletrabalhadores pesquisados atestaram maior utilização de práticas e de ferramentas voltadas à gestão do conhecimento em suas rotinas de trabalho, em comparação aos trabalhadores presenciais analisados na pesquisa.

Um estudo sobre a experiencia de aplicação do modelo de sistemas na administração do estado de Minas Gerais

Busca-se, no presente estudo descrever e discutir a experiência mineira de aplicação do modelo de sistemas na administração pública do Estado iniciado em 1971, orientado pelo Instituto Latino-Americano de Planificação Econômica e Social, ILPES, que recomendou, dentre inúmeras proposições ao Governo do Estado, que se adotasse na administração mineira tal forma de organização.

Design and analysis of an efficient neural network model for solving nonlinear optimization problems

This paper presents an efficient approach based on a recurrent neural network for solving constrained nonlinear optimization. More specifically, a modified Hopfield network is developed, and its internal parameters are computed using the valid-subspace technique. These parameters guarantee the convergence of the network to the equilibrium points that represent an optimal feasible solution. The main advantage of the developed network is that it handles optimization and constraint terms in different stages with no interference from each other. Moreover, the proposed approach does not require specification for penalty and weighting parameters for its initialization. A study of the modified Hopfield model is also developed to analyse its stability and convergence. Simulation results are provided to demonstrate the performance of the proposed neural network.

ILPES: informe de actividades 1987; incluye un complemento del programa de trabajo para 1988

Relata las actividades realizadas en 1987 según las principales subdivisiones internas del Instituto: gestión institucional, programas de capacitación, áreas de programas de asesoría, programación del sector público, programas y políticas sociales, planificación y políticas regionales

PLA and Organoclays Nanocomposites: Degradation Process and Evaluation of ecotoxicity Using Allium cepa as Test Organism

In this study, nanocomposites of PLA and organoclays Cloisite 20A and Cloisite 30B were prepared by the melt intercalation method and the obtained samples were characterized by transmission electron microscopy (TEM). Since composting is an important proposal to the final disposal of biopolymers, the influence of clays on the hydrolytic degradation process of PLA was evaluated by visual analysis and monitoring of molecular weight after periods of 15 and 30 days of degradation in compost. After degradation of the materials in composting environment, the evaluation of cytotoxic, genotoxic and mutagenic effects of compost aqueous extract was carried out using a bioassay with Allium cepa as test organism. The TEM micrographs permitted the observation of different levels of dispersion, including exfoliated regions. In the evaluation of hydrolytic degradation it was noted that the presence of organoclays can decrease the rate of degradation possibly due to the barrier effect of clay layers and/or the higher degree of crystallinity in the nanocomposite samples. Nevertheless, even in the case of nanocomposites, the molecular weight reduction was significant, indicating that the composting process is favorable to the chain scission of PLA in studied materials. In the analysis performed by the bioassay using A. cepa as test organism, it was found that after degradation of the PLA and its nanocomposites the aqueous extract of compost samples induced a decreasing in the mitotic index and an increasing in the induction of chromosomal abnormalities. These results were statistically significant in relation to the negative control (distilled water). By comparing the results obtained for the nanocomposites in relative to pure polymer, there were no statistically significant differences. The types of the observed chromosomal aberrations indicated a possible genotoxic effect of the materials, which may be related to an aneugenic action of PLA degradation products. © 2013 Springer Science+Business Media New York.