151,576 research outputs found
A two-parameter wind speed algorithm for Ku-band altimeters
No full textGlobally distributed crossovers of altimeter and scatterometer observations clearly demonstrate that ocean altimeter backscatter correlates with both the near-surface wind speed and the sea state. Satellite data from TOPEX/Poseidon and NSCAT are used to develop an empirical altimeter wind speed model that attenuates the sea-state signature and improves upon the present operational altimeter wind model. The inversion is defined using a multilayer perceptron neural network with altimeter-derived backscatter and significant wave height as inputs. Comparisons between this new model and past single input routines indicates that the rms wind error is reduced by 10%–15% in tandem with the lowering of wind error residuals dependent on the sea state. Both model intercomparison and validation of the new routine are detailed, including the use of large independent data compilations that include the SeaWinds and ERS scatterometers, ECMWF wind fields, and buoy measurements. The model provides consistent improvement against these varied sources with a wind-independent bias below 0.3 m s?1. The continuous form of the defined function, along with the global data used in its derivation, suggest an algorithm suitable for operational application to Ku-band altimeters. Further model improvement through wave height inclusion is limited due to an inherent multivaluedness between any single realization of the altimeter measurement pair [?o, HS] and observed near-surface winds. This ambiguity indicates that HS is a limited proxy for variable gravity wave properties that impact upon altimeter backscatter
KU KLUX KLANSMAN
No full textArticle entitled "Por qué soy un Ku Klux Klan man” [Why am I a Ku Klux Klan man?] whose author, a Klan man himself argues that he is against a man sitting on a throne pretending to be God and commanding that “you won’t worship other Gods but me”. Therefore, based on that argument he states that an immoral way to manipulate people occurs and in his opinion, that is a strong reason to ally with clans and sects. / Artículo intitulado "Por qué soy un Ku Klux Klanman" en el que, el autor, miembro de dicho clan, argumenta estar en contra de un hombre que sentado en un trono pretendiendo ser Dios decreta que "no tendrás otro Dios antes que yo", y como producto de dicha aseveración maneja de manera innoble al pueblo, lo que considera como causa justificada para aliarse a los clanes o sectas
Micénico ku-pa-ro = PYC/CYP y los determinativos O, KU, PA y QA
No full textEntre los fitónimos de las tablillas micénicas hallamos ku-pa-ro/ku-pa-ro 2 y sus ideogramas equivalentes PYC/CYP. Se piensa comúnmente que designa tres especies del género Cyperus, a saber, C. rotundus L. 'juncia redonda', C. longus L. 'juncia de olor, j. larga' y C. esculentus L. 'chufa, juncia avellanada', pero, por diversas causas, creo que C. esculentus debe excluirse. Para los determinantes de los ideogramas propongo: a) *ku-ka-ra-do = K... d.. para KU, y b) *o-pi-ko-ro-jo = *p. .. ./-. para O. Por otra parte, QA y PA podrían respresentar *qa-ru-ta-to/*pa-ru-ta-to, la primera forma con conservación de la labiovelar y ambas equivalentes al ático a. tat . (o -. ).Among the plant names of the Mycenaean tablets we find ku-pa-ro/ku-pa-ro 2 and its equivalent ideograms PYC/CYP. The identification is generally supposed to be three species of the genus Cyperus, namely C. rotundus L, 'nutsedge', C. longus L. 'galingale', and C. esculentus L. 'tiger nut, chufa', but I think, by several reasons, that C. esculentus must be excluded. For the determinatives of the ideograms I would propose: a) *ku-ka-ra-do = K... d.. for KU, and b) *o-pi-ko-ri-jo = *p. .. ./-. for O. On the other hand, QA and PA might represent *qa-ru-ta-to/*pa-ru-ta-to, the first form with conservation of the labiovelar and both of them to be equated with Attic a. tat . (or -. )
Micénico ku-pa-ro = PYC/CYP y los determinativos O, KU, PA y QA
No full textEntre los fitónimos de las tablillas micénicas hallamos ku-pa-ro/ku-pa-ro 2 y sus ideogramas equivalentes PYC/CYP. Se piensa comúnmente que designa tres especies del género Cyperus, a saber, C. rotundus L. 'juncia redonda', C. longus L. 'juncia de olor, j. larga' y C. esculentus L. 'chufa, juncia avellanada', pero, por diversas causas, creo que C. esculentus debe excluirse. Para los determinantes de los ideogramas propongo: a) *ku-ka-ra-do = K... d.. para KU, y b) *o-pi-ko-ro-jo = *p. .. ./-. para O. Por otra parte, QA y PA podrían respresentar *qa-ru-ta-to/*pa-ru-ta-to, la primera forma con conservación de la labiovelar y ambas equivalentes al ático a. tat . (o -. ).Among the plant names of the Mycenaean tablets we find ku-pa-ro/ku-pa-ro 2 and its equivalent ideograms PYC/CYP. The identification is generally supposed to be three species of the genus Cyperus, namely C. rotundus L, 'nutsedge', C. longus L. 'galingale', and C. esculentus L. 'tiger nut, chufa', but I think, by several reasons, that C. esculentus must be excluded. For the determinatives of the ideograms I would propose: a) *ku-ka-ra-do = K... d.. for KU, and b) *o-pi-ko-ri-jo = *p. .. ./-. for O. On the other hand, QA and PA might represent *qa-ru-ta-to/*pa-ru-ta-to, the first form with conservation of the labiovelar and both of them to be equated with Attic a. tat . (or -. )
Diseño y construcción de un oscilador de microondas estabilizado con resonador dieléctrico en banda Ku.
No full textEn este trabajo se analiza la función que desempeña el oscilador local de frecuencia fija de un sistema de conversión en bloque en una estación terrena receptora de televisión vía satélite operando en banda Ku. También se analizan los efectos de dispersión y discontinuidades presentes en los circuitos de microcinta a estas frecuencias, así como las ventajas que introduce utilizar resonadores dieléctricos como elemento estabilizador de frecuencia en osciladores con dispositivos de estado sólido. Se describe una metodología para el diseño de osciladores utilizando transistores bipolares y/o transistores de efecto de campo metal semiconductor fabricados en arseniuro de galio (GaAs MESFET). La metodología permite diseñar los mencionados osciladores por medio de pequeños programas de computadora con gran rapidez en un intervalo de frecuencia de operación de 2 a 18 GHz. El prototipo que se construyó bajo esta técnica de diseño generó resultados satisfactorios respecto a los requisitos preestablecidos, obteniéndose 11.0 dBm de potencia en 10.8 Gigahertz, con un ruido de fase de-100 dBe @ 100 KHz. La frecuencia de operación mediante sintonización mecánica puede ajustarse en± 5 % y el voltaje de suministro de 8 a 24 Volts de corriente directa
Diseño y construcción de acopladores direccionales con tecnología SIW en las bandas Ku y K
No full text[ES] En este trabajo se han diseñado, simulado y construido acopladores direccionales compactos en la
banda Ku y K utilizando guías de ondas integradas en substrato (Substrate Integrated Waveguide (SIW)).
Utilizando el principio de acoplamiento continuo entre guías de onda adyacentes propuesto por Hildebrand,
se ha conseguido desarrollar estructuras compactas. Para obtener el mejor rendimiento del acoplador, se ha
realizado un estudio paramétrico de las variables geométricas que controlan su comportamiento. Para la
medición de los parámetros de los acopladores, se han estudiado y diseñado transiciones microstip-SIW así
como codos en plano H con guía SIW. Las simulaciones y las mediciones experimentales muestran que los
acopladores poseen buenas características. El acoplador en banda Ku posee un ancho de banda mayor a 14%,
pérdidas de retorno mayores que 21dB y las pérdidas de inserción presentan un rizado menor a ±0.3dB; para
el acoplador en banda K se ha medido un ancho de banda de 22% para pérdidas de retorno mayores a 15dB.[EN] In this work, compact hybrids in substrate integrated waveguide (SIW) technology for Ku and K
bands have been designed, simulated and built. The continuous coupling between adjacent waveguide
concept, proposed by Hildebrand, has been used to achieve compact structure. In order to improve the
performance of the couplers, parametric analyses of their physical variables have been performed.
Microstrip-SIW transitions and H-plane bends have been studied and designed for measuring the coupler
characteristics. Simulations of designed devices show they have excellent characteristics. Simulated and
experimental results show good agreement. Bandwidth larger than 14% has been measured in Ku-band
coupler with return loss higher than 21 dB and insertion loss ripple smaller than ±0.3 dB. A bandwidth of
22% has been measured for the K-band coupler showing a return loss higher than 15 dB.Carrera Suárez, LF. (2010). Diseño y construcción de acopladores direccionales con tecnología SIW en las bandas Ku y K. https://riunet.upv.es/handle/10251/29901.Archivo delegad
The effect of Ku on telomere replication time is mediated by telomere length but is independent of histone tail acetylation
No full textPeer reviewe
Fungal Ku prevents permanent cell cycle arrest by suppressing DNA damage signaling at telomeres
No full textThis is an Open Access article distributed under the terms of the Creative Commons Attribution License.The Ku heterodimer serves in the initial step in repairing DNA double-strand breaks by the non-homologous end-joining pathway. Besides this key function, Ku also plays a role in other cellular processes including telomere maintenance. Inactivation of Ku can lead to DNA repair defects and telomere aberrations. In model organisms where Ku has been studied, inactivation can lead to DNA repair defects and telomere aberrations. In general Ku deficient mutants are viable, but a notable exception to this is human where Ku has been found to be essential. Here we report that similar to the situation in human Ku is required for cell proliferation in the fungus Ustilago maydis. Using conditional strains for Ku expression, we found that cells arrest permanently in G2 phase when Ku expression is turned off. Arrest results from cell cycle checkpoint activation due to persistent signaling via the DNA damage response (DDR). Our results point to the telomeres as the most likely source of the DNA damage signal. Inactivation of the DDR makes the Ku complex dispensable for proliferation in this organism. Our findings suggest that in U. maydis, unprotected telomeres arising from Ku depletion are the source of the signal that activates the DDR leading to cell cycle arrest.Ministerio de Economia y Competitividad (MICINN); Gobierno de España [BIO2011-27773, BIO2014-55398-R]; Weill Cornell Cancer Center (to N.F.L.); Alice Bohmfalk Charitable Trust (to N.F.L.); National Institutes of Health [GM042482, GM079859 to W.K.H.]. Funding for open access charge: MICINN; Gobierno de España [BIO2011-27773].Peer Reviewe
Solving the generalized multi-port container stowage planning problem by a matheuristic algorithm
No full textsponsorship: We would like to thank the anonymous referees for their comments which have helped to significantly improve this paper. This work has been partially supported by the Spanish Ministry of Science, Innovation, and Universities, FPU Grant A-2015-12849 and under theproject "OPTEPPort Terminal Operations Optimization" (No. RTI2018-094940-B-I00) financed with FEDER, Spain funds. The second author acknowledges the partial support by Datadriven logistics, Spain (FWO-S007318N) and Internal Funds KU Leuven, Spain. (Spanish Ministry of Science, Innovation, and Universities|A-2015-12849, Spanish Ministry of Science, Innovation, and Universities|RTI2018-094940-B-I00, Datadriven logistics, Spain|FWO-S007318N, Internal Funds KU Leuven, Spain, FEDER, Spain)status: Published onlin
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