Hydrogen generation from liquid phase catalytic reforming of sugar solutions using metal-supported catalysts

Most of the hydrogen production processes are designed for large-scale industrial uses and are not suitable for a compact hydrogen device to be used in systems like solid polymer fuel cells. Integrating the reaction step, the gas purification and the heat supply can lead to small-scale hydrogen production systems. The aim of this research is to study the influence of several reaction parameters on hydrogen production using liquid phase reforming of sugar solution over Pt, Pd, and Ni supported on nanostructured supports. It was found that the desired catalytic pathway for H-2 production involves cleavage of C-C, C-H and O-H bonds that adsorb on the catalyst surface. Thus a good catalyst for production of H2 by liquid-phase reforming must facilitate C-C bond cleavage and promote removal of adsorbed CO species by the water-gas shift reaction, but the catalyst must not facilitate C-O bond cleavage and hydrogenation of CO or CO2. Apart from studying various catalysts, a commercial Pt/gamma-alumina catalyst was used to study the effect of temperature at three different temperatures of 458, 473 and 493 K. Some of the spent catalysts were characterised using TGA, SEM and XRD to study coke deposition. The amorphous and organised form of coke was found on the surface of the catalyst. (C) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

The next generation messaging technology: Makes web services effective

The vision presented in this paper and its technical content are a result of close collaboration between several researchers from the University of Queensland, Australia and the SAP Corporate Research Center, Brisbane, Australia. In particular; Dr Wasim Sadiq (SAP), Dr Shazia Sadiq (UQ), and Dr Karsten Schultz (SAP) are the prime contributors to the ideas presented. Also, PhD students Mr Dat Ma Cao and Ms Belinda Carter are involved in the research program. Additionally, the Australian Research Council Discovery Project Scheme and Australian Research Council Linkage Project Scheme support some aspects of research work towards the HMT solution.

Power generation investment opportunities evaluation: A comparison between net present value and real options approach

To evaluate an investment project in the competitive electricity market, there are several key factors that affects the project's value: the present value that the project could bring to investor, the possible future course of actions that investor has and the project's management flexibility. The traditional net present value (NPV) criteria has the ability to capture the present value of the project's future cash flow, but it fails to assess the value brought by market uncertainty and management flexibility. By contrast with NPV, the real options approach (ROA) method has the advantage to combining the uncertainty and flexibility in evaluation process. In this paper, a framework for using ROA to evaluate the generation investment opportunity has been proposed. By given a detailed case study, the proposed framework is compared with NPV and showing a different results

O SENTIDO DO TRABALHO PARA A GERAÇÃO Y: UM ESTUDO A PARTIR DO JOVEM EXECUTIVO

O presente trabalho tem como objetivo construir conhecimentos e saberes em relação ao perfil do jovem executivo pertencente à geração Y e identificar o que esse jovem valoriza na construção de vínculos com a organização, qual o significado do trabalho para esta geração que vive num novo cenário mundial constituído a partir da globalização e do avanço da tecnologia. Para atender a este objetivo foi utilizada uma pesquisa exploratória a partir de uma amostra indicativa e intencional sendo o objeto de interesse deste estudo, jovens executivos nascidos após 1978 que ocupam posições de liderança. Utilizaram-se dois instrumentos para coleta de dados: a entrevista em profundidade e a aplicação de uma ferramenta para reconhecimento do perfil cognitivo, denominado MEP Mapa Estratégia Profissional. Às análises dos instrumentos foram acrescidas de um referencial teórico e de estudos publicados no campo da ciência da administração, da psicologia e da sociologia. O diálogo interdisciplinar entre a teoria e os dados de campo evidenciou que esta geração expressa o comportamento de forma diferente das gerações anteriores visto terem nascido e terem sido criados num contexto de mudanças constantes e aceleradas e que o trabalho, para este grupo, é só um meio para alcançar seus objetivos pessoais e não o fim. Demonstram comprometimento com as organizações desde que reconheçam nesta a presença de valores como justiça e lealdade praticados por uma liderança legitimada, que tem em sua pauta, a orientação e o acompanhamento destes jovens.(AU)

Graphene based widely-tunable and singly-polarized pulse generation with random fiber lasers

Pulse generation often requires a stabilized cavity and its corresponding mode structure for initial phase-locking. Contrastingly, modeless cavity-free random lasers provide new possibilities for high quantum efficiency lasing that could potentially be widely tunable spectrally and temporally. Pulse generation in random lasers, however, has remained elusive since the discovery of modeless gain lasing. Here we report coherent pulse generation with modeless random lasers based on the unique polarization selectivity and broadband saturable absorption of monolayer graphene. Simultaneous temporal compression of cavity-free pulses are observed with such a polarization modulation, along with a broadly-tunable pulsewidth across two orders of magnitude down to 900 ps, a broadly-tunable repetition rate across three orders of magnitude up to 3 MHz, and a singly-polarized pulse train at 41 dB extinction ratio, about an order of magnitude larger than conventional pulsed fiber lasers. Moreover, our graphene-based pulse formation also demonstrates robust pulse-to-pulse stability and widewavelength operation due to the cavity-less feature. Such a graphene-based architecture not only provides a tunable pulsed random laser for fiber-optic sensing, speckle-free imaging, and laser-material processing, but also a new way for the non-random CW fiber lasers to generate widely tunable and singly-polarized pulses.

Mujer y poesía:la inscripción de la subjetividad femenina y la conciencia creativa del lenguaje poético

This article explores the place of Spanish women poets within the Spanish cultural space at the end of the 20th century. In clear opposition to the arguments presented by the editors and many of the articles included in this volume, Raquel Medina sees in the most recent poetry written by women an evolution towards a new and independent female poetic voice which clearly fights against the supremacy of male poetic voices and their manipulative poetic language. No longer stealing the male poetic word is necessary for the last generation of Spanish women poets. On the contrary, these women poets create their own language, their own poetic universe, and demolish a long tradition of male poetry which situated the female subject as a dead object of male poetry.

Spectrally controlled, picosecond pulse generation from an InGaN violet diode laser

Self-seeded, gain-switched operation of an InGaN multi-quantum-well diode laser is reported for the first time. Narrow-line, wavelength-tunable, picosecond pulses have been generated from a standard, uncoated diode laser in an external cavity.

Impact of reduced complexity inverse Volterra series transfer function-based nonlinear equalizer in coherent OFDM systems for next-generation core networks

A modern electronic nonlinearity equalizer (NLE) based on inverse Volterra series transfer function (IVSTF) with reduced complexity is applied on coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals for next-generation long- and ultra-long-haul applications. The OFDM inter-subcarrier crosstalk effects are explored thoroughly using the IVSTF-NLE and compared with the case of linear equalization (LE) for transmission distances of up to 7000 km. © 2013 IEEE.

(2,3)-generation of the groups PSL6(q)

2010 Mathematics Subject Classification: 20F05, 20D06.

Mundos prohibidos: El poder en el discurso epistolar de Gertrudis Gómez de Avellaneda y Juana Borrero

This dissertation analyses, through a theoretical framework and a critical approach, letters of Cuban writers Gertrudis Gómez de Avellaneda and Juana Borrero. While love letters have captured the interest of some scholars, such as Claudio Guillén, Cintio Vitier and Alexander Roselló Selimov, the conflict that the analysis of non-literary texts poses has prevented further research in this field. Therefore, I propose a systematic method of analysis encompassing but not limited to evaluating letters based on their purpose, intent, interpretation, and temporal and spatial composition; analyzing the perspective and function of epistolary entities, and examining the textual signs that distinguish the epistolary forms from the literary forms. With this analytical tool, I examine a selection of letters of Gómez de Avellaneda and demonstrate that the writer displaces her identify from the autobiographic self to the epistolary self, in order to manipulate the perspective of her addressee. Caught between the Neoclassical way of thinking and the Romantic aesthetics, her assertive discourse, also reflected in her epistolary work, contributed to the incursion of women writers into the social and professional life of the nineteen century. Following the same method of investigation, an analysis of letters written by Borrero proves that, by building a world of delusion, hallucination and fantasy the writer brings to prose what first generation of female modernistas had done in poetry. In both cases, my focus is on the strategies that turn these letters into instruments of power, process that transformed the love-letter paradigm and forever renovated the women epistolary genre. This dissertation further explores the possibility of initiating a cycle in the study of personal letters to uncover a forgotten genre, mission that might build a bridge to embrace the new forms of written communication that scholars have already begun to explore in contemporary literature.

La mujer en defensa de la mujer: voces femeninas del romanticismo cubano (Poesía y cuento)

Throughout history, women have played an important role in literature. Nevertheless, since Sappho's poetry until now, feminine voices have had to struggle for recognition of their works. Before the nineteenth century, women were almost ignored in Spanish literature. Society kept them as "ángeles de la familia," taking care of their homes, husbands, and children. Some of them, such as María de Zayas y Sotomayor in Spain and Sor Juana Inés de la Cruz in Mexico, complained about their situation in their writings. However, they expressed their fight not as a generation but as individuals. In the nineteenth century, the ideas and ideals of Romanticism, were brought to Latin America from Europe. Cuba was among those countries where the new movement took roots. Initiated by Gertrudis Gómez de Avellaneda, a group of women began to participate in literary reunions, and to found newspapers and magazines where works authored by women, dedicated to feminist ideas, were published. They indeed through literature started to live out womanhood in order to intellectually leave the ideological prisons where society had been keeping them. This study scans the literary works of all Romantic women writers in Cuba. It specifically analyzes poetry and short stories, and investigates how these authors expressed themselves in their works against the patriarchal society, where they lived and wrote their books. An eclectic critical method has been used. Findings were very revealing. Only three of the fourteen writers studied in my dissertation had been previously mentioned by major critics. Most of them had been ignored. However, the greatest discovery was that they prompted something new: For the first time they projected themselves as a group, as a collective consciousness, and this fact established a difference with former women writers in Cuban literature before Romanticism. In other words, they produced a "Renaissance" in Cuba's literature. In spite of how they lived between 1820 and 1900, their struggles for women's rights have linked them to our current times.

Hourly values of X, Y and Z geomagnetic components recorded at Coimbra Station (IAGA code: COI) and local geomagnetic K indices for 2007 to 2014

This study examines the performance of series of two geomagnetic indices and series synthesized from a semi-empirical model of magnetospheric currents, in explaining the geomagnetic activity observed at Northern Hemipshere's mid-latitude ground-based stations. We analyse data, for the 2007 to 2014 period, from four magnetic observatories (Coimbra, Portugal; Panagyurishte, Bulgary; Novosibirsk, Russia and Boulder, USA), at geomagnetic latitudes between 40° and 50° N. The quiet daily (QD) variation is firstly removed from the time series of the geomagnetic horizontal component (H) using natural orthogonal components (NOC) tools. We compare the resulting series with series of storm-time disturbance (Dst) and ring current (RC) indices and with H series synthesized from the Tsyganenko and Sitnov (2005, doi:10.1029/2004JA010798) (TS05) semi-empirical model of storm-time geomagnetic field. In the analysis, we separate days with low and high local K-index values. Our results show that NOC models are as efficient as standard models of QD variation in preparing raw data to be compared with proxies, but with much less complexity. For the two stations in Europe, we obtain indication that NOC models could be able to separate ionospheric and magnetospheric contributions. Dst and RC series explain the four observatory H-series successfully, with values for the mean of significant correlation coefficients, from 0.5 to 0.6 during low geomagnetic activity (K less than 4) and from 0.6 to 0.7 for geomagnetic active days (K greater than or equal to 4). With regard to the performance of TS05, our results show that the four observatories separate into two groups: Coimbra and Panagyurishte, in one group, for which the magnetospheric/ionospheric ratio in QD variation is smaller, a dominantly QD ionospheric contribution can be removed and TS05 simulations are the best proxy; Boulder and Novosibirsk,in the other group, for which the ionospheric and magnetospheric contributions in QD variation can not be differentiated and correlations with TS05 series can not be made to improve. The main contributor to magnetospheric QD signal are Birkeland currents. The relatively good success of TS05 model in explaining ground-based irregular geomagnetic activity at mid-latitudes makes it an effective tool to classify storms according to their main sources. For Coimbra and Panagyurishte in particular, where ionospheric and magnetospheric daily contributions seem easier to separate, we can aspire to use the TS05 model for ensemble generation in space weather (SW) forecasting and interpretation of past SW events.