480Mbit/s UWB bi-directional radio over fiber CWDM PON using ultra-low cost and power VCSELs

Radio-over-fiber (RoF) schemes offer the possibility of permitting direct access to native format services for the domestic user. A low power requirement and cost effectiveness are crucial to both the service provider and the end user. Here, we present an ultra-low cost and power RoF scheme using direct modulation of commercially-available 1344 nm and 1547 nm VCSELs by band-group 1 UWB wireless signals (ECMA-368) at near broadcast power levels. As a result, greatly simplified electrical-optical-electrical conversion is accomplished. A successful demonstration over a transmission distance of 20.1 km is described using a SSMF, CWDM optical network. EVMs of better than-18.3 dB were achieved. © 2011 Optical Society of America

Performance of MB-OFDM UWB and WiMAX IEEE 802.16e converged radio-over-fiber in PON

Experimental results about the performance of converged radio-over- fiber transmission including multiband- OFDM UWB and WiMAX 802.16e wireless over a passive optical network are reported in this paper. The experimental study indicates that UWB and WiMAX converged transmission is feasible over the proposed distribution set-up employing a single wavelength. However, the results indicate that there is an EVM penalty of 3.2 dB for a UWB 10 km SSMF transmission in presence of WiMAX wireless

Joint distribution of polarization-multiplexed UWB and WiMAX radio in PON

In this paper, the feasibility of the joint distribution of ultra-wideband (UWB) and WIMAX wireless using polarization multiplexing as a coexistence technique is proposed and experimentally demonstrated within the framework of passive optical networks (PON). Four single- and orthogonal-polarization multiplexing schemes are studied targeting to reduce the mutual interference when UWB and WiMAX are distributed jointly through standard single-mode fiber (SSMF) without transmission impairments compensation techniques and amplification. Experimental results indicate successful transmission up to 25 km, in SSMF exceeding the range in typical PON deployments. The radio link penalty introduced by optical transmission is also investigated in this paper

Tres tipos monetarios inéditos en el Tesoro de Llíria

En el Tesoro de Llíria (compuesto por 5.990 denarios de época alto imperial) han aparecido tres tipos monetarios no identificados hasta ahora en los trabajos de referencia numismática, tratándose por tanto de monedas inéditas las cuales queremos dar a conocer en este trabajo

Reminiscencias de la Orestea en la obra de Héléne Cixous

En la actualidad Hélène Cixous es uno de los máximos exponentes de las corrientes feministas del siglo XXI. Su innovadora teoría nos ha dejado conceptos como escritura femenina o falocentrismo. En su variada producción encontramos múltiples alusiones a la literatura grecolatina. En este trabajo nos proponemos acercarnos a su obra desde una nueva perspectiva, dejando a un lado el contenido feminista que la impregna. Nos centraremos en aquellos aspectos que la autora rescata de la literatura griega (concretamente de la Orestea) para utilizarlos y reconvertirlos en varios de sus escritos. Para ello vamos a analizar de forma particular tres de sus obras: La jeune née, Les Euménides y La Ville parjure ou le réveil des Erinyes.Currently, Hélène Cixous is one of the greatest exponents of the feminist current of the XXI century. Her innovative theory has given rise to concepts like feminine writing or phallocentrism. However, we find numerous references to the Greco-Latin literature in all his writings. In the present study we aim to take a close look to the literary work from a new standpoint, putting aside the feminist content. To carry out this, we will focus on those aspects that the author retrieves from the Greek literature (specifically, from the Orestea), uses and reconverts in the following books: La jeune née, Les Euménides and La Ville parjure ou le réveil des Erinyes

Absorptive capacity and relationship learning mechanisms as complementary drivers of green innovation performance

This paper aims to explore in depth how internal and external knowledge-based drivers actually affect the firms\u2019 green innovation performance. Subsequently, this study analyzes the relationships between absorptive capacity (internal knowledge-based driver), relationship learning (external knowledge-based driver) and green innovation performance. This study relies on a sample of 112 firms belonging to the Spanish automotive components manufacturing sector (ACMS) and uses partial least squares path modeling to test the hypotheses proposed. The empirical results show that both absorptive capacity and relationship learning exert a significant positive effect on the dependent variable and that relationship learning moderates the link between absorptive capacity and green innovation performance. This paper presents some limitations with respect to the particular sector (i.e. the ACMS) and geographical context (Spain). For this reason, researchers must be thoughtful while generalizing these results to distinct scenarios. Managers should devote more time and resources to reinforce their absorptive capacity as an important strategic tool to generate new knowledge and hence foster green innovation performance in manufacturing industries. The paper shows the importance of encouraging decision-makers to cultivate and rely on relationship learning mechanisms with their main stakeholders and to acquire the necessary information and knowledge that might be valuable in the maturity of green innovations. This study proposes that relationship learning plays a moderating role in the relationship between absorptive capacity and green innovation performance

Una nueva historia.

Sin resume

Mujeres y hombres en la sociedad cortesana. Identidades, funciones, relaciones

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