1,721,535 research outputs found
Noticias secretas de América sobre el estado naval, militar y político de los reynos del Perú y provincias de Quito, costas de Nueva Granada y Chile gobierno y régimen particular de los pueblos de indios
No full textSon 2 t. en 1 v
Noticias secretas de América sobre el estado naval, militar y político de los Reynos del Perú y provincias de Quito, Costas de Nueva Granada y Chile, gobierno y régimen particular de los pueblos de indios, cruel opresión y extorsiones de sus Corregidores y curas... : escritas fielmente según las intrucciones del Marqués y presentadas en informe secreto a Don Fernando VI
No full textParte II con port. propiaH. de lám. calc.: "J. Maea pinxtot, Edwª Scriven sculpt", retr. dos autParte primeira e segunda ; Apéndice p. 61
Noticias secretas de America : sobre el estado naval, militar y politico de los Reynos del Peru y provincias de Quito, Costas de Nueva Granada y Chile, gobierno y regimen particular de los pueblos de indios, cruel opresion y extorsiones de sus Corregidores y curas .. escritas fielmente segun las instrucciones del ... Marques de la Ensenada ... y presentadas en informe secreto á ... Don Fernando VI. Parte Primera; Parte segunda
No full textPrimera parte: Sobre el estado militar y político de las costas del Mar Pacífico; Segunda parte: Sobre el gobierno, administración de justicia, estado del clero, y costumbres entre los indios del interio
Noticias secretas de América : (Siglo XVIII). Tomo I
No full textObra digitalizada por Unidixital en la Biblioteca América de la Universidad de Santiago de CompostelaPrimera parte: Sobre el estado militar y político de las costas del Mar Pacífico; Segunda parte: Sobre el gobierno, administración de justicia, estado del clero, y costumbres entre los indios del interio
Air-water momentum exchange in Lake Geneva under light wind conditions: The effect of natural surfactants
No full textRandomly distributed patches of smooth surfaces are readily observed on most water bodies. They are called natural slicks when biogenic surfactants in the surface microlayer accumulate above a certain threshold. Slicks typically form under low wind conditions (< 6 m s-1), having spatial scales from tens of meters to kilometers. They suppress the formation of wind-induced Gravity-Capillary Waves (GCW), leading to altered surface reflectance of light and microwaves, and can also affect near-surface convective motions. Therefore, it is of interest to understand how slicks affect the air-water exchange of momentum, heat, and gas, which can influence the biogeochemical dynamics in the near-surface layer of lakes and oceans. We examined the spatiotemporal variability of momentum flux caused by slicks in Lake Geneva using eddy covariance instrument setups mounted on an autonomous catamaran during several field campaigns. These measurements were combined with aerial and shore-based imagery (both RGB and thermal). We also sampled surface microlayers in an accompanying boat to determine whether visually-identified smooth patches had higher concentrations of fluorescent dissolved organic matter, a proxy for natural surfactants. Using wavelet analysis, we investigated short-time O(1 min) averaged air-water momentum flux variations associated with the transition from smooth slicks to rough surface areas, which could not be captured by conventional eddy covariance analysis. Results suggest that under light wind conditions and in the absence of short GCW, wind stress cannot effectively be transferred to the water, leading to a reduction of momentum exchange within slicks in comparison to the surrounding non-slick areas. The resulting slick-induced horizontal gradients in vertical mixing can contribute to spatial variability in surface temperature and near-surface heat content, which in turn affects air-water exchange processes.ECO
Signatures of coherent flow structures in the atmospheric surface layer over Lake Geneva
No full textReliable estimates of air-water exchange of momentum, heat, and gas are vital for understanding boundary layer dynamics and for developing accurate global and regional climate and weather forecasting models. Spatiotemporal variability of physical processes, below and above the water surface and at the interface, contribute to the uncertainty of these estimates. Air-side exchange processes are closely related to various phenomena in the Atmospheric Boundary Layer (ABL), which frequently manifest themselves as coherent structures in turbulent flow fields. The identification of such structures and their dynamics is essential for determining their role in the variability of air-water fluxes.ECO
The effect of natural surfactants on air-water momentum exchange under light wind conditions in Lake Geneva
No full textRandomly distributed patches of smooth or rough/rippled surfaces are readily observed on most water bodies. Smooth surface patches are called natural slicks and typically form under low wind conditions (< 6 m s-1) when biogenic surfactants in the surface microlayer accumulate above a certain threshold. They may have spatial scales from tens of meters to kilometers. Slicks suppress the formation of wind-induced Gravity-Capillary Waves (GCW), leading to altered surface reflectance of light and microwaves and can also affect near-surface turbulent motions. Therefore, it is of interest to determine the effect slicks can have on the air-water exchange of momentum, heat, and gas, which can influence the biogeochemical dynamics in the near-surface layer of lakes and oceans. We investigated the spatiotemporal variability in momentum flux caused by slicks in Lake Geneva during several field campaigns using eddy covariance instrument setups mounted on an autonomous catamaran. The measurements were combined with aerial and shore-based imagery (both RGB and thermal). In addition, surface microlayer sampling was conducted from an accompanying boat to determine whether visually-identified smooth patches were associated with higher enrichment of fluorescent dissolved organic matter, a proxy for natural surfactants. Wavelet analysis was used to explore short-time (~1 min) averaged air-water exchange variations related to the transition from smooth slicks to rough surface areas that cannot be captured by the conventional eddy covariance analysis method. Our results suggest that under light wind conditions and in the absence of short GCW on the surface of slicks, wind stress cannot be effectively transferred to the water, leading to reduced momentum exchange inside slicks compared to the surrounding non-slick areas. This results in lateral gradients in vertical mixing that can affect air-water exchange processes and contribute to spatial variability in surface temperature and near-surface heat content.ECO
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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