796 resultados para 833
Resumo:
Introducción: La Comunidad Valenciana inició en octubre del 2008 el programa de vacunación contra el virus del papiloma humano (VPH) en niñas de 14 años. El objetivo de este estudio es evaluar los conocimientos sobre la infección por VPH y su vacuna en madres de adolescentes e identificar los factores asociados a la predisposición de vacunar a sus hijas. Material y métodos: Estudio observacional transversal mediante cuestionario dirigido a madres de alumnas nacidas en 1995 matriculadas en centros de secundaria de la provincia de Valencia durante 2010-2011. Muestra aleatoria estratificada por conglomerados (n = 1.279). Análisis estadístico: porcentajes, intervalos de confianza, OR, contrastes chi al cuadrado y regresión logística multivariante. Resultados: Ochocientos treinta y tres cuestionarios completados (65,1%). El 76,6% de las madres habían vacunado a sus hijas contra el VPH. El 93,8% conocía la vacuna, sobre todo a través de la televisión (71,5%). El 78,5% recibió consejo favorable de un profesional sanitario, lo que mejoró la vacunación de sus hijas (OR: 2,4). Los conocimientos globales sobre la infección por VPH y la vacuna fueron bajos. La confianza de las madres en las vacunas como método preventivo mejora la vacunación contra VPH (OR: 3,8). El miedo a los efectos adversos (45,6%) fue el primer motivo de rechazo. Conclusiones: No parece que los medios de comunicación influyan en la decisión de vacunar. Sería conveniente minimizar la percepción de riesgo ante esta vacuna. El consejo del profesional sanitario actúa a favor de la vacunación si este interviene activamente en sentido positivo. Existe una brecha entre nivel de conocimientos y toma de decisión para vacunar.
Resumo:
The synthesis of different tetrahydroisoquinolines using choline chloride : ethylene glycol as a deep eutectic solvent (DES) and copper(II) oxide impregnated on magnetite as a catalyst has been accomplished successfully. The copper catalyst amount is the lowest loading ever reported. The presence of DES showed to be essential since the reaction in the absence of this medium did not proceed. A direct proportional relationship was found between the conductivity of DES medium and the yield obtained. The DES and the catalyst could be reused up to ten times without any detrimental effect on the yield of the reaction, with the aerobic conditions making the protocol highly sustainable, where the only waste is water.
Resumo:
Resúmenes de: ZURITA ALDEGUER, Rafael: El Marqués del Bosch y el Conservadurismo alicantino. Patronazgo y clientela en el tránsito del sufragio censitario al sufragio universal. Tesis doctoral leída el 19 de septiembre de 1994. Director: Dr. D. Salvador Forner Muñoz; MIRA JEREZ, M. Mercedes: Revolución Liberal y Milicia nacional en Alicante (1.833-1.840). Memoria de licenciatura leída el 21 de mayo de 1.993. Directora: Dra. Dª Rosa Ana Gutiérrez Lloret; MORENO SECO, Mónica: Secularización de la sociedad a través de la educación: reformadores-católicos. Alicante, 1931-1936. Memoria de licenciatura leída el 7 de julio de 1993. Director: Dr. D. Emilio La Parra López; PARRA VERDU, Pedro J.: La Cazuela. Compañía de Teatro Estable en la sociedad alcoyana (1950-1968). Memoria de licenciatura leída el día 28 de mano de 1994. Director: Dr. D. José M. Santacreu Soler; SAMPER ALCAZAR, Joaquín: Introducción a la Historia de Elda. Memoria de licenciatura leída en día 25 de octubre de 1994. Director: Dr. D. José Miguel Santacreu Soler.
Resumo:
L’obiettivo di questa tesi di Laurea è stato di analizzare gli scambi termici radiativi che si verificano all’interno di una stanza; per eseguire questa analisi si sono calcolati i fattori di vista Fij tra diversi punti (i) definiti tramite una griglia regolare posta all’interno della stanza e le superfici che vi si affacciano (j); tale griglia prevede 25 punti posti a 3 altezze diverse, per un totale di 75 punti. Dalla conoscenza delle temperature superficiali si sono ottenuti i valori di temperatura media radiante nei punti della griglia, e successivamente i valori degli indici di benessere PMV (voto medio previsto) e PPD (percentuale prevista di insoddisfatti), fissando i parametri necessari. Il calcolo dei fattori di vista è stato eseguito tramite il software TRISCO®, dopo averne confrontato i risultati forniti con COMSOL® e dopo aver valutato la correttezza di alcune approssimazioni. Il modello utilizzato nelle simulazioni è costituito da una stanza di 5x5x2,8 m, in cui sono stati fatti variare il numero e la posizione di alcuni elementi caratterizzanti, come finestre e radiatori, oltre a tipologia di elementi scaldanti e posizione e numero di pareti esterne, tramite la variazione delle temperature. In seguito si è analizzata la potenza scambiata per irraggiamento dagli elementi scaldanti, per poter riconoscere gli elementi responsabili dei maggiori contributi; nel caso di pavimento o soffitto radiante si è divisa tale superficie in diverse porzioni per riconoscere le zone della superficie radiante più influenti. I risultati ottenuti mostrano che la presenza di radiatori, finestre o pareti esterne, introducendo elementi di disturbo asimmetrici, forniscono andamenti disuniformi di temperatura e PMV, con l’omogeneità che migliora allontanandosi da tali elementi; impianti a pavimento o soffitto radiante producono risultati decisamente migliori, sia per quanto riguarda i valori assoluti di temperatura e PMV, che nell’omogeneità della relativa distribuzione.
Resumo:
Arctic sea ice has declined and become thinner and younger (more seasonal) during the last decade. One consequence of this is that the surface energy budget of the Arctic Ocean is changing. While the role of surface albedo has been studied intensively, it is still widely unknown how much light penetrates through sea ice into the upper ocean, affecting sea-ice mass balance, ecosystems, and geochemical processes. Here we present the first large-scale under-ice light measurements, operating spectral radiometers on a remotely operated vehicle (ROV) under Arctic sea ice in summer. This data set is used to produce an Arctic-wide map of light distribution under summer sea ice. Our results show that transmittance through first-year ice (FYI, 0.11) was almost three times larger than through multi-year ice (MYI, 0.04), and that this is mostly caused by the larger melt-pond coverage of FYI (42 vs. 23%). Also energy absorption was 50% larger in FYI than in MYI. Thus, a continuation of the observed sea-ice changes will increase the amount of light penetrating into the Arctic Ocean, enhancing sea-ice melt and affecting sea-ice and upper-ocean ecosystems.
Resumo:
Volcanic ash layers (1-3 cm thick) are abundant in the North Aoba Basin drill sites but less common at forearc sites. Ash deposited on the forearc slopes is liable to be redistributed as turbidites. In addition, the westerly upper winds also minimize ash-fall on the western (forearc) side of the New Hebrides Island Arc. Crystalline components in the ashes are primarily plagioclase (An90-An44), clinopyroxene (Ca46Mg49Fe5-Ca43Mg33Fe24), olivine (Fo87-Fo62), and titanomagnetite. There are also small amounts of orthopyroxene, magnetite, apatite, and quartz. Glass shards occur in most of the ashes and range in composition from basalt to rhyolite. There is often a variety of glass compositions within a single ash layer. One explanation for this is that the rate of accumulation of ash from several different eruptions or eruptive phases exceeded the background sedimentation rate: there may also have been a certain amount of reworking. The high-K and low-K trends previously recognized in volcanic rocks from the New Hebrides Island Arc are clearly represented in the Leg 134 glasses. All of the ashes investigated here are thought to have originated from the Central Chain volcanoes. The source of the high-K group was probably the Central Basin volcanoes of Santa Maria, Aoba, and Ambrym. The lower-K series includes a distinctive group of dacites and is likely to have originated from the Epi-Tongoa-Tongariki sector of the arc where major pyroclastic eruptions, associated with caldera collapse, have occurred during the Holocene, perhaps as recently as 400 yr ago.
Resumo:
"PMS 830"--Cover, v. 1; "PMS 831"--Cover, v. 2; "PMS 832"--Cover, v. 3; "PMS 833"--Cover, v. 4; "PMS 835"--Cover, v. 6; "PMS 838"--Cover, v. 6a; "PMS 839"--Cover. v. 7; "PMS 840"--Cover, v. 8.
Resumo:
"Contract no. AT(30-1)-702"--Page ii.
Resumo:
Translation of Over de stabiliteit van het elastisch evenwicht (Thesis, Polytechnic Institute of Delft, 1945)