Gain switching of an external cavity grating-coupled surface emitting laser with wide tunability

The gain-switched, single frequency operation of an external cavity grating-coupled surface emitting laser with a wavelength tuning range of 100 nm was presented. The light in the grating section was coupled out of the laser at a specific angle to the surface of the device. Analysis showed that within the driving current range, lasing in the device only occurred when the external cavity was properly aligned.

Ethnic conflict and war crimes in the Balkans:the narratives of denial in post-conflict Serbia

In the years following the fall of Slobodan Milo evic, Serbian social, cultural and political responses to the wars of the 1990s have fallen under intense international scrutiny. But is this scrutiny justfied, and how can these responses be better understood? Jelena Obradovic engages with ideas about post-conflict societies, memory, cultural trauma, and national myths of victimhood and justified war to shed light upon Serbian denial and justification of war crimes - for example, Serbia's reluctant cooperation with the International Criminal Tribunal for the former Yugoslavia (ICTY). Rather than treating denial as a failure to come to terms with the past or as resurgent nationalism, Obradovic argues that the justification of atrocities are often the result of a societal need to understand and incorporate violent events within culturally acceptable boundaries.

Widely tunable gain-switched operation of external cavity grating-coupled surface emitting laser

Widely tunable gain switching of a grating-coupled surface-emitting laser (GCSEL) has been demonstrated in a simple external cavity configuration for the first time. Pulse duration in range of 40-100ps and wavelength tuning over 100nm have been achieved. High power, tail-free optical pulses have been observed at 980nm.

Surface modification of natural fibers using bacteria:depositing bacterial cellulose onto natural fibers to create hierarchical fiber reinforced nanocomposites

Triggered biodegradable composites made entirely from renewable resources are urgently sought after to improve material recyclability or be able to divert materials from waste streams. Many biobased polymers and natural fibers usually display poor interfacial adhesion when combined in a composite material. Here we propose a way to modify the surfaces of natural fibers by utilizing bacteria (Acetobacter xylinum) to deposit nanosized bacterial cellulose around natural fibers, which enhances their adhesion to renewable polymers. This paper describes the process of modifying large quantities of natural fibers with bacterial cellulose through their use as substrates for bacteria during fermentation. The modified fibers were characterized by scanning electron microscopy, single fiber tensile tests, X-ray photoelectron spectroscopy, and inverse gas chromatography to determine their surface and mechanical properties. The practical adhesion between the modified fibers and the renewable polymers cellulose acetate butyrate and poly(L-lactic acid) was quantified using the single fiber pullout test. © 2008 American Chemical Society.

Mathematical Optimization for the Train Timetabling Problem

AMS Subj. Classification: 90C57; 90C10;

Procesos digitales y sistemas de prototipado rápido aditivos aplicados a la creación escultórica de pequeño formato y relieves

La historia del arte está inevitablemente ligada al desarrollo tecnológico. La escultura es una disciplina artística que ha estado presente en toda la historia de la humanidad, desde las venus paleolíticas hechas a mano, hasta esculturas contemporáneas realizadas con tecnologías digitales. Estas últimas son el tema principal de esta tesis. El siglo XX ha sido testigo de la aparición y el desarrollo de la informática. El desarrollo de esta tecnología se debe, fundamentalmente, a su potencial sobre todo en el campo de la ingeniería, pero es un error pensar que el desarrollo de la informática se debe sólo a ingenieros y científi cos. Los artistas han participado en todo el desarrollo de los gráfi cos por ordenador, jugando un papel muy importante en el nacimiento y la evolución de los sistemas de modelado en tres dimensiones. Desde que Charles Babagge conceptualizara la computadora a fi nales del siglo XIX, la informática ha evolucionado a un ritmo vertiginoso...

Virgin Territory: Theology, Purity, and the Rise of the Global Sex Trade

Sex sells. A lot. But who exactly is on the market?

What kinds of bodies are calibrated for traffic and consumption, and how exactly do they get there? When it comes to “sex” trafficking—which comprises a minority percentage of human trafficking, yet dominates the moral imagination as an “especially heinous” crime—the rise in predominantly white, evangelical Christian American interest in the trafficked subject galvanizes an ethical outrage that rarely observes critiques of race, ethnicity, sexuality or class as conditions of possibility. Though a nuanced mandate to fight trafficking is all but cemented in the contemporary American political and moral conscience, Virgin Territory accounts for the ways Christian ideas of purity annex both gender and sexuality inside the legacies of racialized colonial encounter, and foreground the market expansion of the global sex trade as it exists today.

In Part I, I argue that the narratives of virginity tied to Mary’s body simultaneously foregrounded the gendered, sexed Other as sparked disdain for the religious Other, for the Jewish body and for Mary’s Jewish identity. Through this analysis I explore the connections of racial identity to the Christian theological elision of Jewish election. I demonstrate how the questions of sexual ethics materialized at the site of the Virgin Mary, and align the moral attachments of sex and purity in the production of whiteness. These machinations, tied to the emerging European identity of empire, irrupt horrifically into the narrative ontology of dark flesh in Africa, Asia, and the Americas.

In Part II, I highlight the function of these narratives inside of the moments of colonial encounter, demonstrating how the logics of purity and virginity were directly applied to manage dark female flesh. I map the visual iconography of the Black Madonna first through a Dutch painting entitled The Rape of the Negress. I read this image through the social theological imagination instantiating the idea of the reprobate body and white imperial gaze. This analysis foregrounds a theological reading of Sarah Baartman, the “Hottentot Venus,” as the center of a complex sex trafficking investigation, outlining the genealogy of race, as well as the ideologies of the racial, ethnic and national Other, as mitigating factors in the conditions of possibility of a global sex trade. By restoring these narratives and their theological undertones, I reiterate the ways Christian thought is imbricated in the global sex trade, and propose theological strategies for rethinking humanitarian responses to sex trafficking.

El mirto, la rosa y el álamo : El simbolismo del escenario en Pervigilium Veneris

Pervigilium Veneris, datado entre los siglos II y IV d.C., de autor anónimo, es un poema dedicado a la primavera como estación de Venus, al amor y a la deidad que lo patrocina. Describe el ritual de vigilia nocturna destinado a reactualizar el origen del mundo y su regeneración periódica, marcada por el devenir de las estaciones. El poema, dividido en dos grandes partes -canto a la llegada de la primavera y epílogo personal del autor- presenta dos escenarios construidos con diversos símbolos vinculados con la vegetación. Entre uno y otro hay un continuum espacial vinculado con la renovación-procreación y con la muerte-esterilidad. La diferencia entre ambos radica en el tipo de vegetación que acompaña a cada situación: el mirto (myrteo) y la rosa (rosa) en el escenario que narra la llegada de Venus y el álamo (p?p?lus) en el que se refiere al mito de Procne y Tereo. En esta ponencia analizaremos el simbolismo de las plantas antes mencionadas y de los términos utilizados para referirse al bosque -nemus, lucus, saltus y silva-, a las flores -flos, papilla y gemma purpura- y aquellos términos que los acompañan. Partimos de la propuesta de Mircea Elíade para la interpretación del simbolismo religioso en el marco procedimental de la ciencia de las religiones. Entendemos por símbolo una ?cifra? que conforma un ?sistema? y cuyo valor está relacionado con la existencia humana y la cósmica. Intentaremos demostrar que los escenarios creados por los símbolos de la vegetación coinciden con el tono de cada parte del poema, festivo o melancólico, respectivamente.

Counteractive effects of antenatal glucocorticoid treatment on D1 receptor modulation of spatial working memory

RATIONALE: Antenatal exposure to the glucocorticoid dexamethasone dramatically increases the number of mesencephalic dopaminergic neurons in rat offspring. However, the consequences of this expansion in midbrain dopamine (DA) neurons for behavioural processes in adulthood are poorly understood, including working memory that depends on DA transmission in the prefrontal cortex (PFC). OBJECTIVES: We therefore investigated the influence of antenatal glucocorticoid treatment (AGT) on the modulation of spatial working memory by a D1 receptor agonist and on D1 receptor binding and DA content in the PFC and striatum. METHODS: Pregnant rats received AGT on gestational days 16-19 by adding dexamethasone to their drinking water. Male offspring reared to adulthood were trained on a delayed alternation spatial working memory task and administered the partial D1 agonist SKF38393 (0.3-3 mg/kg) by systemic injection. In separate groups of control and AGT animals, D1 receptor binding and DA content were measured post-mortem in the PFC and striatum. RESULTS: SKF38393 impaired spatial working memory performance in control rats but had no effect in AGT rats. D1 binding was significantly reduced in the anterior cingulate cortex, prelimbic cortex, dorsal striatum and ventral pallidum of AGT rats compared with control animals. However, AGT had no significant effect on brain monoamine levels. CONCLUSIONS: These findings demonstrate that D1 receptors in corticostriatal circuitry down-regulate in response to AGT. This compensatory effect in D1 receptors may result from increased DA-ergic tone in AGT rats and underlie the resilience of these animals to the disruptive effects of D1 receptor activation on spatial working memory.

The Mass of Kepler-93b and The Composition of Terrestrial Planets

Kepler-93b is a 1.478 ± 0.019 R ⊕ planet with a4.7 day period around a bright (V = 10.2), astroseismicallycharacterized host star with a mass of 0.911 ± 0.033 M⊙ and a radius of 0.919 ± 0.011 R⊙. Based on 86 radial velocity observations obtainedwith the HARPS-N spectrograph on the Telescopio Nazionale Galileo and 32archival Keck/HIRES observations, we present a precise mass estimate of4.02 ± 0.68 M ⊕. The corresponding high densityof 6.88 ± 1.18 g cm-3 is consistent with a rockycomposition of primarily iron and magnesium silicate. We compareKepler-93b to other dense planets with well-constrained parameters andfind that between 1 and 6 M ⊕, all dense planetsincluding the Earth and Venus are well-described by the same fixed ratioof iron to magnesium silicate. There are as of yet no examples of suchplanets with masses >6 M ⊕. All known planets inthis mass regime have lower densities requiring significant fractions ofvolatiles or H/He gas. We also constrain the mass and period of theouter companion in the Kepler-93 system from the long-term radialvelocity trend and archival adaptive optics images. As the sample ofdense planets with well-constrained masses and radii continues to grow,we will be able to test whether the fixed compositional model found forthe seven dense planets considered in this paper extends to the fullpopulation of 1-6 M ⊕ planets.Based on observations made with the Italian Telescopio Nazionale Galileo(TNG) operated on the island of La Palma by the Fundación GalileoGalilei of the INAF (Istituto Nazionale di Astrofisica) at the SpanishObservatorio del Roque de los Muchachos of the Instituto de Astrofisicade Canarias.

La persévérance scolaire des immigrants haïtiens de première génération au Québec et à New York

Le but de cette thèse a consisté à comprendre les facteurs de la persévérance et de l’abandon scolaire des nouveaux arrivants haïtiens au Québec et à New York. La recension d’écrits a révélé une sous-documentation de la thématique en question. Toutefois, l’élaboration du cadre conceptuel nous a permis de mieux cerner la problématique, d’analyser et de synthétiser plusieurs approches théoriques dont les théories du rendement scolaire des immigrants (Rong et Brown, 2001 ; Warikoo et Carter, 2009 ; Xie et Greenman, 2011), l’approche bourdieusienne des capitaux (1979a, 1979b, 1980), le structuro-fonctionnalisme de Merton (1965) et le courant effets-écoles/ effets-enseignants (Crahay, 2000 ; Bressoux, 1994a). Nous avons également mis en évidence deux approches compréhensives à savoir l’interactionnisme (Weber, 1959 ; Boudon, 1979, 1994 ; Goffman, 1998 ; Garfinkel, 1967) et l’approche du rapport au savoir de l’équipe ESCOL (Rochex, 2002 ; Charlot, 2003) dans l’objectif de faire valoir le caractère relatif des conclusions d’une recherche qualitative qui priorise la subjectivité des participants dans l’analyse des faits sociaux. Dans cette recherche, nous avons interviewé onze participants à Montréal et à Brooklyn, parmi lesquels sept hommes et quatre femmes. Ils ont tous une expérience d’abandon scolaire au secondaire ou au secteur des adultes. Nous avons utilisé l’entretien semi-dirigé comme méthode de collecte d’information et l’analyse thématique est celle de l’analyse des données. L’analyse des données nous a permis de classer les informations fournies par les participants en cinq rubriques : capital économique, capital culturel, capital social, encadrement institutionnel et facteurs spécifiques. Ces cinq rubriques regroupent les facteurs de la persévérance et du décrochage scolaire évoqués par les participants de la recherche. La réalisation de cette thèse nous apporte un bon éclairage quant à notre tentative de comprendre la dynamique de l’abandon scolaire des jeunes et des jeunes adultes immigrants haïtiens de première génération au Québec et à New York, au secondaire et au secteur de l’éducation des adultes. Nous avons mis en relation les résultats de la recherche avec ceux des travaux que nous avons recensés dans la problématique et dans le cadre conceptuel de cette thèse. La synthèse de ces résultats nous a amené à faire une proposition d’éléments d’un modèle d’analyse que nous qualifions de « relance scolaire des nouveaux arrivants haïtiens au Québec et à New York ». L’analyse et la synthèse des facteurs émergents de la recherche, plus précisément des six thèmes qui composent la rubrique des facteurs spécifiques : facteurs démographiques, motivation personnelle, lacunes de base, facteurs affectifs, traits de personnalité et problèmes de comportement, nous ont permis d’élaborer un autre concept qui peut représenter une grande contribution à la persévérance scolaire des nouveaux arrivants haïtiens. Il s’agit de l’encadrement psycho-intégrationnel qui est une forme d’accompagnement dont les jeunes et les jeunes adultes nouveaux arrivants haïtiens pourront être bénéficiaires au début en vue d’un bon démarrage sur le plan socioéducatif et de leur persévérance scolaire au pays d’accueil. L’encadrement psycho-intégrationnel, consistera à mettre en relation certains faits psychologiques qui ont marqué la vie pré-migratoire des élèves jeunes et jeunes adultes d’origine haïtienne avec les faits sociaux qui peuvent influencer leur vie au pays d’accueil. C’est une forme d’assistance individuelle dont l’État, les institutions sociales d’intégration et l’école constitueront les principales structures de matérialisation. Les principaux intervenants, notamment les psychologues, les travailleurs sociaux et les anthropo-sociologues se chargeront de comprendre et d’orienter les nouveaux arrivants quant au nouveau comportement à adopter pour une meilleure évolution sur les plans socio-culturel, professionnel et économique. Mots clés : Persévérance scolaire, relance scolaire, immigrants haïtiens, première génération, nouveaux arrivants.

Pulling Back the Veil: The Characterization and Habitability of Enshrouded Worlds

Thesis (Ph.D.)--University of Washington, 2016-08

The Essay as Art Form

Beginning with Montaigne’s essayistic dictum Que sais je? — ‘What do I know?’ — this PhD thesis examines the literary history, formal qualities, and theoretical underpinnings of the personal essay to both investigate and to practice its relevance as an approach to writing about art. The thesis proposes the essay as intrinsically linked to research, critical writing, and art making; it is a literary method that embodies the real experience of attempting to answer a question. The essay is a processual and reflexive mode of enquiry: a form that conveys not just the essayist’s thought, but the sense and texture of its movement as it attempts to understand its object. It is often invoked, across disciplines, in reference to the possibility of a more liberal sense of creative practice — one that conceptually and stylistically privileges collage, fragmentation, hybridity, chance, open-endedness, and the meander. Within this question of the essay as form, the thesis contains two distinct and parallel strands of analysis — subject matter and essay writing as research. At the core of the study lie two close-readings: Ana Mendieta’s Labyrinth of Venus (1982) and Le Couvent de la Tourette (1959) by Le Corbusier and Iannis Xenakis. In each case, the writing draws, in its tone and texture, on a range of literary influences, weaving together different voices, discussions, and approaches to enquiry. The practice of essay writing is presented alongside, part and party to, research: a method of interrogation that embraces risk and uncertainty, and simultaneously enacts its own findings as a critical-creative mode of study-via-form, and form-via-study. The thesis is presented as a book-length essay, in which the art in question is equal and intimately connected to the writing used to address it. Method and form are designed to respond to the oft-cited challenge of the essay as fundamentally unmethodical, ranging, and diverse. Research, critical study, writerly description, and storytelling are combined to elucidate and expose each other based not on surface continuity, but on a deep interconnection among ideas that, through language, cohere and become related — imbued with an affinity for one another. The consummate product is the argument, as it works across genres, disciplines, descriptive and critical models, to challenge the narrative structure and language used within contemporary writing about art.