139,506 research outputs found
Hydroclimatic variability of opposing Late Pleistocene climates in the Levant revealed by deep Dead Sea sediments
No full textAnnual and decadal-scale hydroclimatic variability describes key characteristics that are embedded into climate in situ and is of prime importance in subtropical regions. The study of hydroclimatic variability is therefore crucial to understand its manifestation and implications for climate derivatives such as hydrological phenomena and water availability. However, the study of this variability from modern records is limited due to their relatively short span, whereas model simulations relying on modern dynamics could misrepresent some of its aspects. Here we study annual to decadal hydroclimatic variability in the Levant using two sedimentary sections covering similar to 700 years each, from the depocenter of the Dead Sea, which has been continuously recording environmental conditions since the Pleistocene. We focus on two series of annually deposited laminated intervals (i.e., varves) that represent two episodes of opposing mean climates, deposited during MIS2 lake-level rise and fall at similar to 27 and 18 ka, respectively. These two series comprise alternations of authigenic aragonite that precipitated during summer and flood-borne detrital laminae deposited by winter floods. Within this record, aragonite laminae form a proxy of annual inflow and the extent of epilimnion dilution, whereas detrital laminae are comprised of sub-laminae deposited by individual flooding events. The two series depict distinct characteristics with increased mean and variance of annual inflow and flood frequency during "wetter", with respect to the relatively "dryer", conditions, reflected by opposite lake- level changes. In addition, decades of intense flood frequency (clusters) are identified, reflecting the in situ impact of shifting centennial-scale climate regimes, which are particularly pronounced during wetter conditions. The combined application of multiple time series analyses suggests that the studied episodes are characterized by weak and non-significant cyclical components of sub-decadal frequencies. The interpretation of these observations using modern synoptic-scale hydroclimatology suggests that Pleistocene climate changes resulted in shifts in the dominance of the key synoptic systems that govern rainfall, annual inflow and flood frequency in the eastern Mediterranean Sea over centennial timescales
Optimal management of the newborn with an anorectal malformation and evaluation of their continence potential
No full textAnorectal malformations affect 1 in 3000–5000 children, with varied incidences dependent upon geographical location. Accurate assessment, and subsequent targeted management in the newborn is critical to reducing potential morbidity and mortality. We have focused in this review upon the management of newborns with anorectal malformations, and the evaluation of the potential for long-term fecal continence
Plan de desarrollo [de la] Divisi?n de Ciencias Sociales y Humanidades : 2012-2013
No full textEl plan de desarrollo genera un marco para la convivencia universitaria, donde la gesti?n y el servicio propician la armon?a en el quehacer acad?mico cotidiano. El presente documento reafirma la voluntad cr?tica de quienes participaron en su elaboraci?n, evidencia las modalidades y limitaciones con las cuales hemos asumido nuestro modelo matricial, as? como los avances acumulados en el tiempo. Estoy cierto de que la ?nica manera de visualizarnos hacia el futuro, es comprender nuestros impedimentos, y enmarcar ?stos en un contexto de superaci?n factible, donde se consolide la confianza en nuestras capacidades
Spatially-localized time dependent solutions including turbulence and their interactions in 2D Kolmogorov flow
No full textIn 2D Kolmogorov flow in small aspect ratio domains, spatially-localized solutions such as kink, traveling or time-dependent kink-antikink pars coexist. However, the conservation of the flow rate in the y direction strongly restrict combination of localized solutions and their positioning. We find that by adding a homogeneous flow U y their positioning is controlled and each of localized solutions including a spatially-localized chaos is isolated. Numerical results suggest that these isolated solutions can be elements constructing a whole flow
Characteristics of overlap region in high-Reynolds number turbulent channel flow
No full textDirect numerical simulation of the fully developed turbulent channel flows have been carried out at the Reynolds number based on the friction velocity and the channel half width, 2000, 4000 and 8000. A hybrid 10th order accurate finite difference scheme in the stream and spanwise directions, and a second-order scheme in the wall-normal direction is adapted as the spatial discretization method. We observed the plateau profiles in the indicator function corresponded to the von Karman constant. Furthermore, second peak of streamwise pre-multiplied spectra were appeared in the same wall normal height, 300 < y+ < 600, in case of Re = 4000. Nevertheless, the effects of the lager than the channel half height scale on the streamwise turbulent intensity are fixed contributions without dependence on Reynolds number. These results suggested that the new streamwise vortexes are formed between buffer layer and outer layer with increasing of Reynolds number
La 'circunstancia' de 'Herederos y Pretendientes
No full textIn June 2010, the Ortega y Gasset Foundation hosted a Conference about the “Spanish Philosophical Transition” in order to debate the book of Francisco Vázquez, La filosofía española. Herederos y Pretendientes. Una lectura sociológica (1963-1990), recently published. This paper is the author’s response to criticism raised in the Conference and to published reviews received by this book. First, the author summarized the argument of Herederos y pretendientes. Secondly he responds and takes into account the most important objections against the book’s hypothesis and methodology. Finally the author evaluates the favorable judgments received by the book and suggests the limits of the historian’s task.Fundación Ortega y Gasset-Marañó
Author self-citation in orthodontics is associated with author origin and gender.
No full textBACKGROUND
The aims of this bibliometric study were to determine author self-citation trends in high-impact orthodontic literature and to investigate possible association between self-citation and publication characteristics.
METHODS
Six orthodontic journals with the highest impact factor as ranked by 2017 Journal Citation Reports were screened for a full publication year (2018) for original research articles, reviews, and case reports. Eligible articles were scrutinized for article and author characteristics and citation metrics. Univariable and multivariable negative binomial regression was used to examine associations between self-citation incidence and publication characteristics.
RESULTS
Medians for author self-citation rate of the most self-citing authors and self-citations were 3.03% (range 0-50) and 1 (range 0-19), respectively. In the univariable analysis, there was no association between self-citation counts and study type (P = 0.41), article topic (P = 0.61), number of authors (P = 0.62), and rank of authors (P = 0.56). Author origin (P = 0.001), gender (P = 0.001) and journal (P = 0.05) were associated with self-citation counts and in the multivariable analysis only origin and gender remained strong self-citation predictors. Asian authors and females self-cited significantly less often than all other regions and male authors.
CONCLUSIONS
Authors in orthodontics do not self-cite at a frequency that suggests potential citation manipulation. Author origin and gender were the only variables associated with citations counts. More bibliometric research is necessary to draw solid conclusions about author self-citation trends in orthodontic literature
Armonía y Disonancia en la planificación operativa de una universidad estatal y tecnológica
No full text<p><strong><span>Introducción:</span></strong><span> la Universidad Nacional de Ingeniería es una institución de educación superior estatal y tecnológica, dedicada a la formación de pregrado, grado y posgrado; investigación científica, extensión y vinculación a nivel nacional e internacional. Su planificación operativa la establece con una lógica de dirección armónica y lineal, pero en la práctica aparece el sentido emergente, la interacción entre las personas entrelazándose relaciones formales e informales de trabajo que guían el cumplimiento de objetivos, planes y controles internos, pero a la vez las demandas del contexto externo generan actividades extra plan, todo esto muestra una complejidad organizacional. <strong>Objetivo:</strong><span> </span>identificar los elementos de la realidad organizacional que llevan a la institución a una armonía, pero también a una disonancia en cuanto al cumplimiento de la planificación operativa. <strong>Método:</strong> se aplicó una investigación cualitativa, desde el enfoque de la Teoría Fundamentada, utilizando la entrevista semi estructurada. <strong>Resultados:</strong> se identifican los elementos de la realidad organizacional que generan armonía: la estructura, la dirección, la participación y la comunicación; en la disonancia: en la programación y ejecución de la planificación, la comunicación y capacitación. <strong>Conclusión:</strong> se concluye que la comunicación está presente en la armonía como en la disonancia en la planificación operativa anual. </span></p>
Escuela p??blica y maestro en Am??rica Latina. Historias de un acontecimiento, Siglos XVIII-XIX
No full textEscuela p??blica y maestro en Am??rica Latina. Historias de un acontecimiento, Siglos XVIII-XIX es una antolog??a de art??culos compilada por el investigador colombiano Alberto Mart??nez Boom y el investigador argentino Jos?? M. L. Bustamante Vismara. En la introducci??n, los autores proponen una analog??a entre las variaciones de Bach y las variaciones de la escuela: ???distintas armon??as con ritmos, frecuencias y silencios diferentes, pero sostenidos por un tono uniforme???, que se evidencian en las diferentes perspectivas que aparecen en los art??culos sobre un mismo objeto
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