1,527 research outputs found
Direct laser written polymer waveguides with out of plane couplers for optical chips
Optical technologies call for waveguide networks featuring high integration
densities, low losses, and simple operation. Here, we present polymer
waveguides fabricated from a negative tone photoresist via
two-photon-lithography in direct laser writing, and show a detailed parameter
study of their performance. Specifically, we produce waveguides featuring bend
radii down to 40 {\mu}m, insertion losses of the order of 10 dB, and loss
coefficients smaller than 0.81 dB/mm, facilitating high integration densities
in writing fields of 300 {\mu}m x 300 {\mu}m. A novel three-dimensional coupler
design allows for coupling control as well as direct observation of outputs in
a single field of view through a microscope objective. Finally, we present
beam-splitting devices to construct larger optical networks, and we show that
the waveguide material is compatible with the integration of quantum emitters
L’aménagement d’un espace habitable
Aménager son appartement constitue une expérience des plus intéressantes du point de vue de l’étude de l’interobjectivité. Un véritable dialogue s’y noue entre sujets et objets, ainsi qu’entre les objets eux-mêmes, appelés à cohabiter en un même espace. La problématique ici proposée se concentre surtout sur la dialectique entre esthétique et fonctionnalité qui préside au choix des objets, sur le double rôle de l’espace, précondition du sens en même temps qu’objet parmi les autres, sur certains effets de rimes entre formes, couleurs ou matériaux entrant dans la composition des objets, et sur diverses questions liées à la notion de style en tant que dimension intervenant dans les modes de la coprésence interobjective.Decorating one’s home represents an interesting experience from the point of view of a semiotic theory of the interaction between objets and subjects and, above all, between the objects themselves, especially when juxtaposed within one single space. This article focuses on the dialogue between aesthetics and functionality, which governs the choice of all furniture, on the role of the spatial dimension, on various types of correspondences or “ rhymes ” among shapes, colors or materials composing the objects, and finally on various problems of “ style ” arising from modes of interobjective co-presence
No relationship between baseline salivary alpha-amylase and State-Trait Anxiety Inventory Score in drug-naïve patients with short-illness-duration first episode major depressive disorder : an exploratory study
Salivary ?-amylase (sAA) activity alternations are observed in major depressive disorder (MDD) being associated with depression severity and its specific psychopathological dimensions with anxiety being attributed to distress. No data is available on sAA in MDD according to Hamilton Rating Scale for Depression (HAMD-17) and State-Trait Anxiety Inventory (STAI). The exploratory study examines whether and to what extent baseline sAA level is interrelated to the psychopathological features including severity of symptoms and specific psychopathological dimensions. The basal, non-stimulated sAA activity was studied in 20 non-late-life adult, treatment-naïve MDD patients with short-illness-duration and in 20 age- and sex-matched healthy controls along with psychometric assessments with Hamilton Rating Scale for Depression (HAMD-17) and Spielberger State-Trait Anxiety Inventory (STAI). Significantly lower (p=0.011) sAA activity was observed in MDD as compared to controls. No significant correlations were observed between sAA activity and the total HAMD-17 score as well as with regard to the specific core depression, insomnia, anxiety and somatic HAM-D psychopathological dimensions. No significant correlations were also found between sAA and STAIX-1 and STAIX-2 scores. Low baseline sAA levels in MDD with no correlations between sAA and psychopathological features including severity of symptoms and specific psychopathological dimensions was found
Chemical Inhibitors of the Calcium Entry Channel TRPV6
ABSTRACT: Purpose: Calcium entry channels in the plasma membrane are thought to play a major role in maintaining cellular Ca2+ levels, crucial for growth and survival of normal and cancer cells. The calcium-selective channel TRPV6 is expressed in prostate, breast, and other cancer cells. Its expression coincides with cancer progression, suggesting that it drives cancer cell growth. However, no specific inhibitors for TRPV6 have been identified thus far. Methods: To develop specific TRPV6 inhibitors, we synthesized molecules based on the lead compound TH-1177, reported to inhibit calcium entry channels in prostate cancer cells in vitro and in vivo. Results: We found that one of our compounds (#03) selectively inhibited TRPV6 over five times better than TRPV5, whereas TH-1177 and the other synthesized compounds preferentially inhibited TRPV5. The IC50 value for growth inhibition by blocking endogenous Ca2+ entry channels in the LNCaP human prostate cancer cell line was 0.44 ± 0.07μM compared to TH-1177 (50 ± 0.4μM). Conclusions: These results suggest that compound #03 is a relatively selective and potent inhibitor for TRPV6 and that it is an interesting lead compound for the treatment of prostate cancer and other cancers of epithelial origi
Semiotinė populizmo kritika
Comment expliquer l’immense succès actuel de leaders populistes tels que Donald Trump, Jair Bolsonaro, Matteo Salvini, Victor Orban arba ir Marine Le Pen? Les explications sociologiques et politologiques font appel à une série de données contextuelles : ce qui joue en faveur des partis « anti-élitistes », c’est la crise économique, c’est le chômage, l’immigration, l’insécurité, attribués les uns et les autres à la faillite du « système » politique représentatif. Le but de cet article est de compléter ces explications en adoptant une perspective proprement sémiotique (en immanence) qui consiste à analyser les rapports sensibles, de caractère « intime » — personnellement, immédiatement, esthésiquement vécus — qui se nouent entre les leaders populistes et leurs partisans. L’article inclut en outre une typologie des régimes politiques (totalitarisme, absolutisme, démocratie représentative, démocratie « directe » et sa caricature, la démagogie) interdéfinis sur la base des régimes interactionels qui les sous-tendent
Plaidoyer pour l’esprit de création
L’article pose la question de savoir si la recherche, par les sémioticiens, des principes régulateurs qui sont à la base de toute pensée articulée ne tend pas parfois à se transformer en une sorte de parti pris idéologique. L’intention de départ est claire : si nous portons notre attention sur ce qu’imposent les lois de la pensée, c’est avec l’idée que leur connaissance ne peut que favoriser le développement d’une vie intellectuelle libre et créative. C’est là notre visée et c’est ce qui fonde la sémiotique comme prise de conscience émancipatrice – comme « gai savoir », disait Greimas. Cependant, en pratique, à force de mettre systématiquement l’accent sur les contraintes de la production du sens, est-ce que nous ne sommes pas en train d’en arriver au point d’hypostasier la régularité et de nous transformer, paradoxalement, en gardiens de l’ordre obsédés par la règle, au détriment de l’esprit de création
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