114 research outputs found
Optimisation of random DFB Raman laser amplifier
No full text4 pags., 5 figs. .--17th International Conference on Transparent Optical Networks (ICTON), Budapest, Hungary, 5-9 July 2015We numerically optimise 2nd-order random DFB Raman laser amplifiers for transmission for the first time. Optical signal to noise ratio, nonlinear phase shift, signal power variation and the impact of the reflectivity of FBG are investigated in the links from 10 - 120 km.The authors wish to acknowledge the financial support of the EU through the Marie Skłodowska-Curie individual fellowship ‘CHAOS’ (No. 658982) for P. Rosa, FP7 ITN programme ICONE, and the Spanish MINECO through grant TEC-27314 (RAMAS).Peer reviewe
How many preterm births in England are due to excision of the cervical transformation zone? Nested case control study
No full textR Wuntakal, A Castanon are joint first authors.
© 2015 Wuntakal et al. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2393/15/232This manuscript presents independent research funded by the National
Institute for Health Research (NIHR) under its Research for Patient Benefit
(RfPB) Programme (Grant Reference Number PB-PG-1208-16187). The views
expressed are those of the author(s) and not necessarily those of the NHS,
the NIHR or the Department of Health. The funder had no input in the
design, conduct, collation, analysis or interpretation of the data or the
preparation, review or approval of the manuscript
[Company Message] from [Al G.] Hemming to Peggy, [Carson Estate Company], 1947
No full textInternal message taken from Al G. Hemming requesting two lease agreements for lease on Lot 14, Tract 4054 for C. Castanon beginning September 1, 1947, ending September 1, 1948 and Lease No. 9 for Sunru Chang, beginning July 1, 1947, ending June 30, 1948 with an increase in cost
Link optimization for DWDM transmission with an optical phase conjugation
No full text6 págs.; 7 figs.; OCIS codes: (060.1660) Coherent communications; (060.2320) Fibre optics amplifiers and oscillators; (060.4370)
Nonlinear optics, fibers.We characterize in-span signal power asymmetry in random distributed feedback ultralong Raman laser-amplified WDM transmission and numerically optimize fiber span length and operating band to achieve the lowest inter-span signal power asymmetry between transmitted and optically conjugated channels in systems relying upon mid-link optical conjugation to combat fiber nonlinear impairments. © 2016 Optical Society of AmericaMarie Skłodowska-Curie IF CHAOS for P. Rosa (658982); FP7 ITN programme ICONE
(608099); Spanish MINECO grant ANOMALOS (TEC2015-71127-C2); Comunidad de Madrid
grant SINFOTON (S2013/MIT-2790-SINFOTON-CM).Peer Reviewe
Cone depth increases risk of adverse obstetric outcomes following treatment for cervical preinvasive disease.
No full textRaman cell optimisation for distributed amplification based transmission systems
No full textCommercially available Raman fiber pumps display relatively high Relative Intensity Noise (RIN) that gets transferred to the output signal in systems relying on Raman distributed amplification. This has been shown to drastically hinder performance in Raman-based transmission systems [1], limiting the practically usable forward pump powers and setting constraints to the design of low signal power variation (SPV) bidirectional systems with optimised optical signal-to-noise ratios (OSNR) [2]. Recent works have highlighted a remarkable improvement in the resilience to RIN transfer of higher-order ultralong Raman fiber lasers (URFL) in a random Distributed Feedback (rDFB) laser amplifiers configurations with no fiber Bragg grating (FBG) at the front-end [3]. Moreover, we have shown [4] that a low-reflectivity front-end FBG can be more beneficial than no back-reflections at all, for enhancing pumping efficiency while still keeping RIN transfer under control. Here we extend previous analysis of the low-reflectivity URFL amplification scheme including experimental investigation of RIN transfer, OSNR and pump power requirements for different architectures. We perform a comparison with the rDFB approach and present a detailed optimisation of the main amplifier parameters for the effective design of Raman-based transmission systems.Peer Reviewe
Report on the Field Trip to Mexico
No full textMexico, name of a "project" open to the future rather than a country or a state (Adolfo Castanon) -. The following text is the brief report of interviews on the "trans-cultural Mexicanity," which were held with Mexican writers, critics and researchers in August 2002 in Mexico City. This report will be integrated into the book (in preparation) on the theme of Trans-Culture, Surrealism and Primitive Art
Unrepeatered 240-km 64-QAM transmission using distributed raman amplification over SMF fiber
No full textWe present a theoretical and experimental investigation of unrepeatered transmission over standard single-mode fiber (SMF-28) using several schemes of distributed Raman amplification, including first, second, and dual order. In order to further extend the transmission distance, we utilize advanced bidirectional higher-order ultra-long Raman fiber laser-based amplification, where we use fiber Bragg gratings (FBGs) to reflect Stokes-shifted light from the secondary pumps. Our work demonstrates the possibility of transmission up to 240-km span length with a total span loss of 52.7 dB. Here, we use a 28-Gbaud signal using a 64-quadrature amplitude modulation (QAM) modulation format. Our results highlight the contribution of nonlinear compensation using digital back propagation in a digital signal processor (DSP) code at the receiver
DESCREVER AS VEREDAS OU NARRAR O GRANDE SERTÃO?: A TAREFA DE ARLINDO DAIBERT AO TRADUZIR O ROMANCE EM IMAGENS
No full textO trabalho toma a série de setenta e um desenhos, colagens,
aquarelas e xilogravuras G.S.:V. - uma tradução em imagens
do romance Grande sertão: veredas, de João Guimarães Rosa,
feita pelo artista plástico mineiro Arlindo Daibert - como
recriação de processos descritivos e descrição de processos
criativos do romance. Parte-se do pressuposto de que, ao se
esquivar do compromisso tradicional da ilustração com o
encadeamento e o conteúdo narrativos, de modo coerente com
sua concepção de desenho como forma de raciocínio e com seu
próprio projeto artístico, Daibert consegue retomar e
desdobrar algumas das questões estéticas, culturais e
históricas mais importantes do romance, através do
estabelecimento de uma cartografia que se caracteriza antes
pela mescla de referências que pela fixação de limites
entre elas. Buscou-se abordar essas questões de forma a
estabelecer, adicionalmente, um estreito diálogo com a
crítica especializada da obra de Guimarães Rosa, não a fim
de legitimar as reflexões visuais através da crítica
literária, mas ao contrário, a fim de mostrar o quanto
ambas podem ganhar em mútua colaboração
"Estudio y edicion critica de ""Sangre, valor y fortuna"", de Francisco Bances Candamo"
No full textSangre, valor y fortuna is the only play by dramatist Francisco Bances Candamo (1662-1704) which has never been published. It was not included in the Poesias comicas, the most complete collection of comedias by Bances Candamo, nor was it published in the form of a suelta, as happened with other plays by the same author. The only extant source for this comedia is one single manuscript kept as the Biblioteca Nacional, in Madrid. Its handwriting is seventeenth century, yet is is not the playwright's own.In addition to providing an extensive introduction that gives a useful biographical profile of Bances Candamo, as well as the historical background, I explore some of the most noteworthy aspects of the play, I offer my own edition of the text of Sangre, valor y fortuna, which is the first modern attempt to edit the manuscript and correct the copist's errors, thus presenting the play as close as possible to Bances Candamo's original intentions. Completing the edition is the critical apparatus, consisting of thorough explanatory footnotes and a bibliography--the most extensive about Bances Candamo up to date.Made available in DSpace on 2011-05-07T14:17:26Z (GMT). No. of bitstreams: 2
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